Total terms explained available: 567
Speed at which fluid moves up the annulus. Commonly used in Drilling to describe the speed at which drilling fluid is pumped out of hole. The annular velocity of the mud is critic…
The lower portion of the drillstring, consisting of (from the bottom up in a vertical well) the bit, bit sub, a mud motor (in certain cases), stabilizers, drill collar, heavy-weight drillpipe, jar…
A volume of mud that is more dense than the mud in the drillpipe and wellbore annulus. A slug is used to displace mud out of the upper part of the drillpipe before pulling pipe out of the hole and…
Buoyance is the force applied upwards on an object partially submerged in fluid, this force is generated by the weight of the fluid displaced by the object.
For drilling this means that …
Swab and Surge pressures on a wellbore are caused by the movement of pipe in and out of the hole. Swabbing occurs when pipe is pulled out of the hole while surging occurs whilst running into the h…
Kick tolerance in drilling well design refers to the maximum volume of formation fluid (or "kick") that can enter the wellbore without exceeding the pressure limits of the weakest format…
A LOT, or Leak-Off Test, is a procedure conducted during drilling operations to determine the strength of the formation at the casing shoe. Essentially, it measures the pressure a…
A Formation Integrity Test (FIT) is a procedure used in drilling operations to assess the strength of the formation at the casing shoe. It ensures that the formation can withstand…
In drilling operations, bottoms up refers to the process of circulating drilling fluid from the bottom of the wellbore all the way to the surface. This ensures that any cuttings, …
A top drive is a mechanical device suspended from the derrick's traveling block that rotates the drillstring directly from the top, rather than using a rotary table and kelly. It runs on a guide r…
A mud pump is a heavy-duty pump used in drilling operations to circulate drilling fluid (commonly known as "mud") down the wellbore. It is a key component of the circulating system in bo…
In drilling applications, mud, commonly referred to as drilling fluid, is a specially formulated liquid mixture that plays a critical role in the drilling process.
Drilling mud is typica…
A drawworks is a critical component of a drilling rig's hoisting system, designed to handle the heavy lifting and lowering of equipment during drilling operations. It's es…
The crown block is the stationary pulley assembly located at the very top of the derrick or mast. It works in conjunction with the traveling block to create a block-and-tackle system that provides…
A derrick is the large, load-bearing tower-like structure located over a drilling rig’s well center. Its primary function is to support the hoisting system used to raise and lower the drillstring …
The drill floor is the heart of the rig, the elevated platform where the crew (roughnecks) works to make connections and operate equipment. It houses the rotary table, drawworks, driller's console…
The standpipe manifold is a critical component in a drilling rig's circulating system. It acts as a junction point where drilling fluid (mud) is managed, routed, and directed under high pressu…
A Blowout Preventer (BOP) is a critical safety device in drilling operations, designed to control and seal the well in the event of unexpected pressure or a blowout—a situation where uncontr…
Lost Returns is reduction or complete absence of drilling fluid (or mud) returning to the surface through the annulus when it is pumped down the drill string. This issue occurs when the drilling f…
LCM, or Lost Circulation Material, refers to solid materials added to drilling fluid to address the issue of lost circulation during drilling operations. Lost circulation occurs when drilling flui…
A jack-up rig is a type of mobile offshore drilling unit (MODU) designed for shallow-water operations. It consists of a buoyant hull fitted with three or four retractable legs that can be lowered …
A semi-submersible rig is a type of floating offshore drilling unit designed for deepwater operations. Unlike jack-up rigs, which rest on the seabed, semi-submersibles remain buoyant and are stabi…
Shallow Water - Depth: Up to 1,000 feet (305 meters) - Common rigs: Jack-up rigs, fixed platforms - Used for: Nearshore drilling, continental shelf operations
A balanced cement plug is a method of placing cement in either open hole or casing to act as a permanent barrier or kick-off plug. This method 'balances' the hydrostatic pressure inside the cement…
Extended reach drilling is a term used to define a well with a hard to reach target based on hole geometry. Initially this term was used for deviated wells whose 'reach' caused the Total M…
When drilling, a thick layer of residue, called "filter cake", builds up when the fluid is pushed against a porous surface. Some liquid seeps through, leaving the solids in the mud behind which is…
When a wellbore is drilled, it should be the same size as the bit that drilled it, this is what is considered gauge hole (or in-gauge if you include tolerance)., In some cases where rock…
Hydrostatic pressure is the pressure exerted by the weight of a column of fluid at any point when the fluid is static. When drilling a well, one of the most important criteria is to ensu…
The neutral point in a drill string is the point in the string that is neither in compression or tension. Since the drill string is held at surface, normally by a top drive, the weight o…
A pill is a small amount of fluid of different specification to the drilling fluid that is used to accomplish a specific task. For example, pills can be used to circulate LCM (loss cont…
A reservoir refers to a subsurface accumulation of hydrocarbons, such as crude oil and natural gas, contained within porous or fractured rock formations. These reservoirs form when organic materia…
Underbalance refers to a state when the pressure exerted by the drilling mud is less than the pressure in the formation. In general, this should be avoided as it would allow the well to 'kick' and…
A drill bit is the cutting tool attached to the end of the drillstring, responsible for crushing, shearing, or grinding the rock formation to deepen the wellbore. Its performance directly dictates…
The drillstring is the entire column of tubulars and accessories used to drill a well, transmitting rotation and drilling fluid from the surface to the bottom of the hole. It typically consists of…
The rotary table is a mechanical device located on the drill floor that provides rotational force to the drillstring. It consists of a rotating disk with a master bushing that grips the kelly or d…
A mud pump is a large, high-pressure reciprocating pump used to circulate drilling fluid (mud) down the drillstring and back up the annulus. It is often referred to as the heart of the drilling ri…
Mud tanks are large open-top steel containers used to store and condition drilling fluid on a rig. They are arranged in a series (active system) where mud flows from compartment to compartment, al…
A shale shaker is the primary solids control device on a drilling rig, functioning as the first line of defense against drilled cuttings. It consists of a vibrating sieve or screen that separates …
A Polycrystalline Diamond Compact (PDC) bit is a type of fixed-cutter drill bit that uses synthetic diamond cutters to shear rock. Unlike roller cone bits with moving parts, PDC bits are solid one…
A Tricone bit is a type of roller cone drill bit consisting of three rotating cones equipped with cutting elements—either steel teeth (Milled Tooth) or tungsten carbide inserts (TCI). As the bit r…
Casing refers to the large-diameter steel pipe cemented into a wellbore to maintain structural integrity and prevent the hole from collapsing. It isolates different formation zones to prevent flui…
Tubing is the pipe specifically used to transport oil, gas, or water from the reservoir to the surface after the well has been drilled and cased. Unlike casing, which is cemented permanently in pl…
A mechanical device attached to the outside of the casing string to keep it centered in the wellbore. Proper centralization is crucial for a good cement job. It ensures mud can be displaced …
The component in the wellhead that supports the weight of the casing string. It also provides a seal between the casing and the wellhead bowl. Hangers can be 'slip-type' (using teeth to grip…
A Blowout Preventer (BOP) is a large, specialized high-pressure valve system installed at the wellhead to seal the wellbore in the event of a kick (uncontrolled influx of formation fluid). It is t…
A choke manifold is a system of high-pressure valves and chokes used to control the flow of fluids from the well during a kick or well control operation. When the Blowout Preventer (BOP) is closed…
The wellhead is the surface termination of a wellbore that provides the structural and pressure-containing interface for the drilling and production equipment. It incorporates the casing heads and…
A kelly hose (rotary hose) is a high-pressure, flexible steel-reinforced rubber hose connecting the standpipe to the swivel or top drive. It allows the vertical movement of the traveling block whi…
The standpipe is a rigid vertical pipe fastened to the derrick leg that conducts drilling fluid from the mud pumps up to the level of the derrick where the kelly hose attaches. It also houses the …
The traveling block is the moving pulley assembly that travels up and down the derrick, suspended by the drilling line from the crown block. It supports the top drive (or hook/swivel) and essentia…
In conventional rotary drilling (using a kelly), the swivel is the device that hangs from the traveling block and connects to the kelly. It allows the drillstring to rotate while being suspended a…
Drill collars are thick-walled, heavy tubulars placed at the bottom of the drillstring, just above the bit. Their primary purpose is to provide weight on bit (WOB) to drill effectively and to keep…
A stabilizer is a BHA component with blades that stick out to the full gauge of the hole. Its function is to center the drillstring in the wellbore, which helps improve drilling efficiency, preven…
A reamer (or hole opener) is a tool used to enlarge the wellbore beyond the size of the original pilot bit. It can be run simultaneously with the bit (reaming while drilling) or as a dedicated tri…
A float valve (or non-return valve) is installed in the BHA, typically just above the bit. It allows drilling fluid to be pumped down the drillstring but prevents formation fluids or cuttings from…
Drill pipe constitutes the majority of the drillstring length. It is seamless steel pipe with threaded connections (tool joints) on each end. It transmits torque and hydraulic fluid to the bit whi…
The mousehole is a hole in the rig floor, lined with pipe, used to store a joint of drill pipe or kelly ready for connection. It speeds up the connection process by allowing the next piece of pipe…
The rathole is another hole in the rig floor, used specifically to store the kelly and swivel when they are not in use (typically during tripping operations). Stowing the heavy, suspended kelly in…
A Mud Gas Separator (MGS), often called a 'poor boy degasser,' is a large vertical vessel used during well control operations. Unlike standard degassers that handle small amounts of entrained gas,…
See **Kelly Hose**. The term 'rotary hose' is synonymous with kelly hose, referring to the flexible high-pressure connection between the standpipe and the swivel/top drive. It is called a rotary h…
In conventional rotary drilling, the kelly bushing is the device that fits into the master bushing of the rotary table and transmits torque to the kelly (the square or hexagonal pipe at the top of…
The master bushing is a heavy steel insert that fits into the rotary table. It provides the interface for different inserts, such as the kelly bushing (for drilling) or slip bowls (for setting pip…
A slip bowl is a tapered insert placed into the master bushing to hold the 'slips' – wedge-shaped dies that grip the pipe. The tapered design ensures that as the pipe weight pulls down, the slips …
A pipe spinner is a pneumatic or hydraulic tool used to rapidly spin the drill pipe during the make-up or break-out process. It replaces the dangerous 'spinning chain' used manually by roughnecks …
An Iron Roughneck is a hydraulic machine used to connect and disconnect (make up and break out) drill pipe joints. It replaces the manual use of large casing tongs and spinning chains, significant…
The catwalk is a long, elevated ramp or platform extending from the pipe rack up to the drill floor. It serves as the staging area where pipe is lifted from the racks before being pulled up the V-…
The pipe rack is the storage area outside the rig floor where drill pipe, casing, and tubing are stored in horizontal rows. It consists of steel beams and stops to prevent pipe from rolling. The drill line is a heavy-duty wire rope usually ranging from 1-1/8 to 1-5/8 inches in diameter. It is strung between the crown block and traveling block to hoist loads. It is stored on a large sp…
The deadline anchor is the fixed point on the rig floor where the 'dead' end of the drill line is secured. It does not move during hoisting operations. It contains a weight sensor (load cell) that…
The hydraulic power storage unit for the Blowout Preventer (BOP). It uses nitrogen-charged bottles to store high-pressure hydraulic fluid. It ensures the BOP rams can be closed rapidly and r…
A rubber element BOP that can seal around any shape of pipe (drill pipe, casing, irregular shapes) or even seal on an open hole. It is typically the first line of defense in a kick, providin…
A type of BOP that uses steel rams to seal the well. Pipe rams seal around a specific size of pipe, while Blind Shear Rams cuts the pipe and seals the hole completely. Rams are the ultimate …
A generic term for a unit containing pumps and reservoirs to supply hydraulic fluid to rig equipment (tongs, spinners, catwalks). Mud logging is the continuous monitoring of a drilling rig's active fluid system and the microscopic examination of drilled cuttings to gather geological and safety data. It serves as the primary …
A logging tool is a downhole instrument lowered into the wellbore to measure the physical properties of the rock formation and the fluids it contains. These tools use various physics principles—el…
Wireline refers to the cabling technology used to lower equipment or measurement tools into the wellbore. Electric wireline consists of a braided steel cable with an electrical conductor core, all…
A thin, solid wire used to lower mechanical tools into the well. Unlike electric line, it has no conductor and relies on mechanical manipulation. Used for setting plugs, opening sliding slee…
Measurement While Drilling (MWD) is a technology that transmits real-time downhole data to the surface during the drilling process. Its primary function is to provide directional survey data (Incl…
Logging While Drilling (LWD) involves placing formation evaluation tools directly into the Bottom Hole Assembly (BHA) to record petrophysical data as the well is being drilled. This effectively al…
The practice of recording the geological, physical, or chemical properties of the wellbore and formation. Can be done with wireline (open hole) or LWD (while drilling). The Gamma Ray (GR) tool measures naturally occurring gamma radiation emitted by rock formations. Since shales typically contain higher concentrations of radioactive isotopes (like Potassium, Urani…
A resistivity tool measures how strongly a rock formation opposes the flow of electric current. Since hydrocarbons are insulators (high resistivity) and formation salt water is conductive (low res…
A Neutron Porosity tool emits high-energy neutrons into the formation. These neutrons collide with hydrogen nuclei (mostly in water or hydrocarbons) and lose energy. By detecting the returni…
A Density tool (Litho-Density) uses a radioactive source (Cesium-137) to emit gamma rays into the formation. The scattering of these gamma rays is related to the electron density of the rock, whic…
A Sonic tool measures the travel time (Delta-T) of sound waves through the formation. It consists of a transmitter and multiple receivers. The speed of sound depends on the rock type and fluid con…
A formation tester (like M-Dyanmics or MDT) is a wireline tool that presses a probe against the borehole wall to measure formation pressure and take fluid samples. It provides critical data …
Mud additives are specialized chemicals and materials mixed into the drilling fluid to tailor its properties for specific well conditions. The drilling fluid system is complex, requiring precise c…
Barite (Barium Sulfate) is a high-density mineral used as a weighting agent in drilling fluids. By adding ground barite to the mud, engineers increase the hydrostatic pressure exerted by the fluid…
A clay mineral (sodium montmorillonite) added to fresh water to create drilling mud. It swells when hydrated, providing viscosity and fluid loss control. It forms a filter cake on the boreho…
Lost Circulation Material (LCM) refers to substances added to drilling fluid to seal fractures or cavernous formations and prevent the loss of whole mud into the formation. Loss of circulation is …
A mud agitator is a mechanical mixer mounted on mud tanks. It features an impeller shaft that extends into the fluid, rotating constantly to keep solids suspended. Without agitation, weighti…
A degasser is a solids control device used to remove entrained gas bubbles (methane, H2S, or CO2) from the drilling fluid. Gas-cut mud reduces the effective density of the fluid and can damage pum…
A viscometer (typically a Fann 35 rotational viscometer) is a laboratory instrument used by the mud engineer to measure the rheological properties of the drilling fluid, such as Plastic Viscosity …
A mud balance constitutes the simplest yet most critical instrument on the rig. It is a beam balance scale used to verify the density (mud weight) of the drilling fluid, typically measured in poun…
A filter press is used to measure the filtration properties of the drilling mud. It simulates the loss of fluid filtrate into a porous formation by applying pressure (100 psi) to a mud sample agai…
A shale density tester is a kit used by mud loggers to measure the bulk density of shale cuttings. By placing cuttings in a column of fluids with graduated densities, they can determine the compac…
The mud mixer (or mixing hopper) is a venture-jet device used to add dry chemicals (sacks of bentonite, barite, polymers) into the liquid mud system. High-velocity fluid creates a vacuum that suck…
See **Viscometer**. A rheometer is the more technical term for the device used to measure the flow of matter (rheology). In oilfield context, it specifically refers to the rotational viscometers u…
A mud cooler is a heat exchanger (typically plate-and-frame) used to reduce the temperature of the drilling fluid returning from hot wells (HP/HT). Hot mud can damage elastomers in BOPs, LWD tools…
A mud heater is used in cold environments or when using oil-based mud (OBM) to maintain fluid viscosity. OBM can become extremely viscous at low temperatures, making it difficult to screen and pum…
The solids control system is the collection of equipment (shakers, desanders, desilters, centrifuges) designed to remove drilled solids from the mud. Drilled solids are detrimental; they increase …
A cuttings dryer (vertical centrifuge) is used to recover expensive base oil from drill cuttings before they are discharged or shipped for disposal. It uses high G-forces to spin the oil off the r…
A steel container used to collect and transport drill cuttings from the rig to a disposal facility. Essential for 'skip and ship' operations. A gas chromatograph is an analytical instrument used by mud loggers to separate and analyze the chemical composition of gas extracted from the drilling mud. It identifies specific hydrocarbon comp…
The logging winch is the powerful hydraulic drum unit used to spool the wireline cable in and out of the well. It must be capable of lifting long, heavy tool strings (thousands of pounds) from dee…
Memory tools record logging data to an internal hard drive or chip rather than transmitting it to the surface in real-time. They are used in slickline operations or on drill pipe (LWD) where telem…
The lithology recorder refers to the software or manual track used by mud loggers to construct the 'lith log.' It compiles data from cutting samples (percent sand/shale/limestone) vs. depth. A device used to catch consistent samples of returning drilling fluid for analysis. It can be a simple 'possum belly' catch point at the shaker or an automated sampling arm. Consistent sampl…
A mud density meter (or densiometer) provides a continuous, automated reading of the drilling fluid density entering or leaving the well. It typically uses a radioactive source (nuclear densiomete…
This instrument measures the electrical conductivity (or resistivity) of the mud filtrate. It is crucial when drilling with water-based muds to track changes in salinity. A sudden increase i…
The pH meter measures the acidity or alkalinity of the drilling fluid. Most water-based muds are kept alkaline (pH 9-10.5) to control corrosion and activate polymer additives. A drop in pH c…
A retort kit distills a known volume of mud to separate and measure the oil, water, and solids content. By heating the sample, liquids are vaporized and condensed into a graduated cylinder. …
A cementing unit is a high-pressure pumping system used to mix cement slurry and pump it down the wellbore. These units are typically truck-mounted (for land jobs) or skid-mounted (offshore) and a…
A cement plug is a specific volume of cement placed at a desired depth in the wellbore to create a solid set barrier. Unlike primary cementing (which fills the annulus), plugs are placed inside th…
A packer is a downhole device used to provide a seal between the outside of the production tubing and the inside of the casing, liner, or wellbore wall. By expanding its elastomeric elements, it i…
A perforating gun is a device loaded with shaped explosive charges, lowered into the well to create holes (perforations) in the casing and cement sheath, connecting the wellbore to the reservoir f…
Well completion refers to the process of preparing a drilled well for production (or injection). This phase involves installing the production tubing, downhole jewelry (safety valves, packers), an…
Pressure testing involves applying hydraulic pressure to a vessel, pipe, or wellbore component to verify its integrity and ability to hold pressure without leaking. In well construction, this is m…
A hydrostatic test involves filling a vessel or pipe with liquid (water) and pressurizing it to a specified level to check for leaks or structural failure. It is safer than pneumatic testing becau…
A cement head is the manifold attached to the top of the casing during a cement job. It provides a connection for the cement lines and houses the cementing plugs (top and bottom). It prevent…
A float shoe is a rounded, tapered component attached to the bottom of a casing string. It serves two main purposes: checking back-flow and guiding the casing. It contains a one-way check valve th…
A component installed 1-2 joints above the casing shoe. It contains a check valve to prevent cement backflow. It provides a landing seat for the cement wiper plugs. A liner hanger is a mechanical device used to suspend a liner (a casing string that does not extend to the surface) from the bottom of the previous casing string. It grips the inside of the parent…
A stage collar is a cementing valve installed in the casing string that allows the cement job to be performed in multiple stages. It is used when the hydrostatic pressure of a single long column o…
A cement retainer is a drillable isolation tool (packer) used for squeeze cementing operations. It is set above the zone to be squeezed (e.g., perforations producing water). The cement is pumped t…
A bridge plug is a downhole tool used to permanently or temporarily isolate the lower part of a wellbore. Unlike a retainer, it does not have a valve for pumping through; it is a solid plug. Squeeze cementing is a remedial cementing operation where cement slurry is forced under pressure into specific voids, such as perforations, casing leaks, or behind the casing (channels). The goal …
A Cement Bond Log (CBL) is an acoustic wireline log run to evaluate the integrity of the hydraulic seal between the casing and the formation. It measures the attenuation of sound waves traveling t…
Tracking pressure in the casing annuli (A, B, C annulus) at the wellhead. Vital for well integrity management. Sustained annular pressure (SAP) can indicate a tubing or casing leak. Periodic testing of safety barriers (SCSSV, X-mas tree valves, annular seals) to ensure the well is safe to operate. Pressurizing the casing string to a specified limit to verify it has no leaks before drilling out the shoe or starting production. Verifying the integrity of the production tubing string, usually done after running the completion. The device on the cement unit (recirculating mixer) that wets the dry cement powder with water. It uses high energy to ensure a homogeneous mix. A nuclear or coriolis meter that measures slurry density (ppg) in real-time. Density control is critical for well control and cement quality. The arrangement of valves on the cement unit used to route fluids (water, spacer, cement) to the pumps. Rubber wiper plugs (Top and Bottom) used to separate cement from mud inside the casing. They wipe the casing clean and prevent fluid contamination. A bow spring centralizer is a device fitted to the outside of the casing to keep it centered in the borehole. Centering the pipe is crucial for a good cement job; if the pipe touches the wall (sta…
Scratchers are wire brushes or cable loops attached to the casing. As the casing is reciprocated (moved up and down) or rotated, the scratchers mechanically scour the borehole wall. This act…
Wiper plugs are rubber/elastomer plugs used during cementing to separate fluids and clean the inside of the casing. The 'bottom plug' goes ahead of the cement to wipe drilling mud off the casing w…
A cement basket is a canvas or metal umbrella-like device run on the casing string, typically below a stage collar or weak formation. Its purpose is to support the hydrostatic weight of the cement…
A cementing head (or plug container) is installed on top of the casing string at the rig floor. It holds the wiper plugs and allows them to be released into the flow stream without breaking contai…
The check valve inside the float shoe or collar. See **Float Shoe/Collar**. It prevents backflow. The shoe track is the section of casing between the float shoe and the float collar, usually 1 to 3 joints (40-120 ft) long. Its purpose is to trap contaminated cement that settles on top of the t…
See **Float Collar** or **Stage Collar**. A spacer is a calculated volume of fluid pumped between the drilling mud and the cement slurry. It serves two functions: to separate incompatible fluids (mud and cement) and to clean the hole. Small tanks on the cementing unit unit containing liquid additives (accelerators, retarders, fluid loss agents). These are metered into the mix water or slurry on the fly. Precise control of…
The specific high-pressure pumping unit carried on a truck chassis. See **Cementing Unit**. It is mobile, self-contained, and ruggedized for field locations. It typically carries centrifugal…
High-pressure steel pipes (treating iron) used to connect the pump truck to the wellhead. They are assembled from sections of Chicksan pipe with hammer unions. They must be staked down or re…
A 'checksan' or swivel joint in the treating line that allows for flexibility in the piping layout. It can rotate 360 degrees on ball bearings while holding pressure. Crucial for rigging up …
Analog or digital gauges used to monitor pump pressure. Chart recorders are the official record. Monitoring pressure trends (such as 'lift pressure' when cement turns the corner, or the 'bum…
An electronic data acquisition system (DAQ) that records rate, pressure, and density vs. time. It produces the job log or 'ticket'. This legal record proves the job was pumped according to d…
A workover rig is a mobile rig specifically designed to perform remedial operations on producing wells. Unlike drilling rigs, they generally lack the heavy mud pumping and rotation capabilities re…
A swab rig is a lightweight truck-mounted unit equipped with a winch and cable, used primarily to remove fluids from the wellbore to initiate production. By running a 'swab cup' assembly down the …
Coiled tubing (CT) is a long, continuous length of flexible steel pipe wound on a large reel. It can be run into a live well (under pressure) without having to make connections, making it faster a…
A gas lift valve is a flow-control device installed in the side-pocket mandrels of the production tubing. It allows high-pressure gas injected down the annulus to enter the tubing at specific dept…
An Electrical Submersible Pump (ESP) is a multi-stage centrifugal pump installed downhole to lift large volumes of fluid to the surface. It is powered by an electric motor connected to the surface…
A Progressing Cavity Pump (PCP) is a type of positive displacement pump used for artificial lift. It consists of a single helical metal rotor rotating inside a double helical elastomeric stator. A…
Standard mechanical tools run on slickline, including gauge cutters (to check tubing ID), swaging tools (to push out dents), and pulling tools (to retrieve plugs). They rely on the manipulat…
Fishing tools are specialized mechanical devices used to retrieve lost or stuck equipment ('fish') from the wellbore. The 'fish' could be anything from a broken drill bit or a piece of wireline to…
An overshot is the most common external catch fishing tool. It is designed to go over the top of a fish (like a piece of pipe) and grip it with internal hardened grapples or slips. Once engaged, t…
A fishing tool used to engage the *inside* diameter of a fish (stuck pipe). It uses slips to grip the ID. Impact tools used in a fishing string. They store potential energy and release it suddenly to deliver a heavy hammer blow to free stuck pipe. Similar to a snubbing unit, a rig-less system that uses hydraulic cylinders to trip pipe. Used for heavy interventions without a derrick. A snubbing unit is a specialized hydraulic rig used to run tubing into or out of a well that is under pressure (live well). Unlike conventional rigs that rely on pipe weight to push into the well,…
A high-pressure pump dedicated to killing the well (pumping heavy fluid to overcome formation pressure) during an emergency. Well control equipment encompasses all the hardware used to maintain pressure control of the wellbore to prevent a blowout. During intervention, this typically includes the Blowout Preventer (BOP)…
A lubricator is a long, pressurized pipe section temporarily installed on top of the wellhead or BOP during wireline operations. It provides a chamber to house the tool string (logging tools, guns…
A stuffing box is a sealing device on the top of the lubricator (for slickline) or wellhead (for rod pumps). It uses packing elements (rubber) compressed around the moving wire or rod to prevent w…
See **Lubricator**. The pressure vessel riser allowing tools to enter a live well. An explosive or hydraulic tool used to set a bridge plug. It pulls a mandrel to expand the slips and packing element. A tubing anchor catcher (TAC) is a device run on the tubing string in rod-pumped wells. It anchors the tubing to the casing wall to prevent it from moving up and down (breathing) with the stroke o…
A tool used to sever the production tubing when it cannot be retrieved normally (i.e., stuck). Mechanical cutters use rotating blades, while chemical or jet cutters use explosives/chemicals. A tubing jack is a hydraulic lifting device used when a workover rig is not capable of pulling stuck tubing or packers. It sits on the wellhead and uses powerful hydraulic rams to exert a slow, ma…
A downhole camera is a diagnostic tool run on wireline or coiled tubing to visually inspect the wellbore. Modern cameras can provide real-time video or high-resolution stills of casing damage, obs…
A downhole pressure/temperature gauge run on slickline. It records data to internal memory for later analysis. The sealing device at the top of the lubricator or injector head. For wireline, it's a grease injection head; for coil, it's a stripper rubber. The main drive unit of a coil tubing system. It uses contr-rotating chain blocks (gripper blocks) to push or pull the continuous tubing string into/out of the well. The large spool holding the continuous length of steel tubing (often 10,000-20,000 ft). It has a fluid swivel to allow pumping while the reel turns. A modular package containing the power pack and control cabin for wireline or slickline operations offshore. Fishing jars that use a hydraulic time-delay mechanism to trigger the impact. The operator pulls up, fluid bleeds through a restriction, and then the jar fires. Jars that fire based on a preset load setting (spring or detent). They provide a crisp, audible impact. A fishing magnet is a simple yet effective retrieval tool used to recover small ferrous objects (junk) from the bottom of the well, such as bit cones, bearings, or hand tools. Powerful perma…
An impression block (or lead impression block, LIB) is a flat-bottomed tool faced with soft lead. It is run down to the top of a fish or obstruction and set down with weight. The soft lead d…
An explosive tool (string shot) used to unscrew a stuck pipe connection at a specific depth ('backing off'). A nozzle assembly run on coil tubing to wash sand or debris out of the wellbore using high-velocity fluid. A tool dressed with crushed tungsten carbide (junk mill) used to grind up steel or cement obstructions in the well. A casing scraper. It has blades to scrape rust, scale, and cement sheath off the casing ID to prepare it for packer setting. A slickline tool (gauge cutter) used to scrape wax (paraffin) deposits from the tubing wall. A sand bailer (or hydrostatic bailer) is a wireline tool used to remove sand or debris covering a fish or plugging the wellbore. It uses the pressure differential between the wellbore and an atmos…
A frac pump is a high-horsepower positive displacement pump designed to inject stimulation fluids into a well at immense pressures and rates. A typical frac unit (truck or skid) houses a large die…
The blender is a critical piece of equipment in a frac fleet that mixes the base fluid (water), chemicals, and proppant into a homogenous slurry before sending it to the high-pressure pumps. It fe…
Proppant is a granular material mixed with fracturing fluid to 'prop' open the fractures created during hydraulic fracturing. Without proppant, the fractures would close back up due to the immense…
Generic term for a system of valves and piping used to route flow. Acidizing is a stimulation treatment involving the pumping of acid (usually Hydrochloric [HCl] or Hydrofluoric [HF] acid) into the well to dissolve rock and improve permeability. In carbonate rese…
Hydraulic fracturing (fracking) is a well stimulation technique used to enhance hydrocarbon flow from low-permeability reservoirs (like shale) by creating conductive fractures in the rock. Fluid i…
Any intervention to improve well productivity (Acidizing, Fracturing). A frac tree (or frac stack) is a temporary, heavy-duty valve assembly installed on the wellhead specifically for the fracturing operation. It is designed to withstand the extreme pressures (10,000…
Heavy-duty, high-pressure temporary piping (15,002 psi rated) used to connect frac pumps to the wellhead. A large localized sand storage vessel (mountain mover) on the frac site. It uses belts to feed sand to the blender. Flexible hoses used for lower pressure connections (suction lines) or specialized high-pressure flexible lines (coflex). The chemical additive unit (or liquid add system) consists of storage tanks and precision metering pumps mounted on a truck. It injects small volumes of specialized chemicals (friction reducers, b…
The belt system (T-belt) that moves sand from the sand kings to the blender hopper. A hydration unit (pre-gel blender) is a truck-mounted system designed to hydrate the guar gum or polymer powder used in the frac fluid before it reaches the main blender. Proper residence ti…
The data van is the command center of a hydraulic fracturing operation. It houses the computers, monitoring screens, and the 'Company Man' and Service Supervisor who control the job. Real-ti…
A group of perforation holes shot in a specific interval. Multiple clusters make up a frac stage. The technique of isolating part of the horizontal well to treat it separately (using plugs or sleeves). A ball drop system is a method of isolating stages in a horizontal well. Sliding sleeves are installed in the casing. To fracture a stage, a specific-sized ball is dropped from the surface and pum…
Plug-and-perf is the most common completion technique for unconventionals. It involves running a wireline gun string to set a frac plug (isolating the previous stage) and then firing perforation g…
Pumping fluid to determine the pressure required to crack the formation rock (Fracture Gradient). A composite plug set between stages to isolate the previously fractured zone. It is designed to be drilled out easily later. A dissolving or phenolic ball used to seal on a seat in a plug or sleeve to divert flow to the fracture ports. A zipper manifold is a large valve arrangement used in multi-well fracturing operations (zipper fracs). It connects the high-pressure pumping fleet to multiple wellheads simultaneously. This…
The inlet funnel on the blender where sand is added to the fluid stream. See **Blender Tub**. Precision pumps on the chemical unit used to add liquid additives (friction reducer, biocide) to the frac or completion fluid. See **Frac Pump**. The main horsepower unit. Large mobile storage tanks (typically 500 bbl / 21,000 gallons) used to store fresh water or flowback water on location. Dozens of these tanks are manifolded together to provide the massive …
A flowback tank is an open-top atmospheric tank used to receive fluids returning from the well immediately after fracturing (load recovery). It allows gas to vent safely while liquids and sand set…
A manifold of adjustable chokes and valves used to control the return rate of fluids from the well during clean-up. A test separator used during flowback to measure gas, oil, and water rates and separate sand. A sand separator (sand trap) is a high-pressure vessel placed between the wellhead and the choke manifold during flowback. It uses centrifugal force or gravity to knock out abrasive frac sand from…
A coil-assisted frac tool is an assembly run on the end of coiled tubing used for 'pinpoint stimulation.' It typically includes a packer and a blast joint. By setting the packer, the operato…
The technician or facility responsible for loading explosives (shaped charges) into the perforation gun carriers. A safety switch in the firing panel to prevent accidental detonation of guns. Poly-lined or fiberglass tanks used to transport and store hydrochloric acid (HCl) on location. A unit that mixes acid with additives (corrosion inhibitors, iron control agents) before pumping it downhole. See **Acid Pump**. A Christmas tree is the assembly of valves, spools, and fittings located on top of the wellhead to control the flow of oil and gas from the well. It is the primary interface for production operati…
A separator is a pressure vessel used to separate the production stream into its individual components: oil, gas, and water. Gravity is the primary mechanism; the vessel is designed to hold the fl…
A desander is a hydrocyclone device installed on the production facility to remove sand and solids from the produced fluid stream. Fluid enters tangentially, creating a vortex that throws heavy so…
A desalter is the first process unit in a crude oil refinery. It washes the crude oil with water to dissolve salts and then uses an electrostatic grid to coalesce and separate the salty water from…
A heater treater is a specialized vessel that uses heat to break oil-water emulsions and separate gas from the liquid. Since crude oil often comes out of the ground as an automated emulsion with w…
A flowline is the pipe connecting the wellhead to the separation equipment or production manifold. It transports the raw, unprocessed multiphase fluid (oil, gas, water, sand) at wellhead pressure.…
Small diameter pipelines that transport oil/gas from individual wells to the central battery or processing plant. A pumpjack (nodding donkey) is the surface drive unit for a sucker rod pump system, the most common form of artificial lift for onshore wells. It converts the rotary motion of a motor into the rec…
Separator internals refer to the mechanical components inside a separator vessel that enhance separation efficiency. Key internals include the 'Inlet Diverter' (dissipates momentum of incoming flu…
The engineering discipline of ensuring fluids can move from the reservoir to the sale point without plugging (hydrates, wax, scale) or slguging. The process of analyzing and adjusting well parameters (choke size, lift gas rate) to maximize production. Any method used to add energy to the fluid column to help it flow to surface (Rod Pump, ESP, Gas Lift). A device installed in the tubing string that houses the gas lift valve. 'Side pocket mandrels' allow valves to be changed via wireline. Plunger lift is a cost-effective method of artificial lift used primarily in gas wells that produce liquids. It utilizes a free-traveling piston (plunger) that cycles up and down the tubing. As th…
The control valve on the Christmas tree that restricts flow to control production rate and backpressure. A separator dedicated to testing individual wells periodically to determine their oil, water, and gas rates for allocation. A production manifold is the piping arrangement that gathers flow lines from multiple wells and directs them to test or production separators. It consists of a series of headers (Test, Production,…
A chemical injection pump is a small, positive displacement metering pump used to inject precise amounts of chemicals into the flowline or wellhead. Common chemicals include corrosion inhibitors, …
A pig trap is the generic term for both pig launchers and receivers. In a production field context, it usually refers to the receiver at the inlet of the central facility where flowlines terminate…
Portable separation and metering equipment used for temporary well testing (e.g., on exploration wells). See **Tubing**. The conduit through which fluids are brought to the surface. See **Subsurface Safety Valve**. A Surface Safety Valve (SSV) is an automatic fail-safe closed valve fitted on the Christmas tree. It is hydraulically or pneumatically held open. If control pressure is lost (due to an emerg…
See **Wellhead Choke**. The main pipe in the manifold that collects flow from all producing wells and directs it to the bulk separator. The main vessel that separates the bulk flow from all wells into gas, oil, and water streams. The fire tube assembly that provides heat to the heater treater vessel to break oil-water emulsions. A vessel (Chemelectric treater) using electrostatic grids to remove the final traces of water from the crude oil. A vessel used to remove small amounts of liquid (scrub) from a gas stream to protect downstream compressors. The piping system that takes produced gas, regulates its pressure, and scrubs it for use as fuel for site engines and heaters. See **Stock Tank**. Atmospheric storage tank for treated oil. 'Sales tank'. See **VRU**. A packaged unit containing chemical tanks and metering pumps. The calibrated section of pipe containing the flow meter (orifice plate or turbine) for sales measurement. Automated sampling probe (LACT sampler) that takes small bites of fluid to determine average quality. Storage tank for production chemicals (demulsifier, corrosion inhibitor). A production flare is a vertical stack equipped with a burner tip used to safely burn off excess or waste gas that cannot be sold or processed. It is a critical safety system for relieving pressur…
A heat exchanger is a device designed to efficiently transfer heat from one fluid to another without them mixing. In refining and processing, they are ubiquitous for heating crude oil (using hot p…
A distillation column (fractioning tower) is a tall vertical vessel used to separate liquid mixtures into component parts based on differences in boiling points. It is the core unit operation in a…
A heat exchanger at the bottom of a distillation column. It boils a portion of the bottom liquid to generate the vapor required for distillation. A heat exchanger at the top of a distillation column that cools and condenses the overhead vapor back into liquid (reflux and distillate). Large bulk storage for crude or products. Can be floating roof or fixed roof. A tank where the roof floats on the liquid surface. This eliminates the vapor space, significantly reducing evaporation losses and fire risk. See **Production Flare**. A vessel in the flare system (Flare KO Drum) designed to catch any liquid carryover before the gas goes to the flare tip. The pressure vessel where the primary chemical reaction takes place (e.g., Hydrotreating reactor). See **Fluid Catalytic Cracking**. Hydrotreating is a catalytic process used to remove impurities like sulfur (desulfurization), nitrogen, and metals from petroleum fractions. Hydrogen gas is reacted with the feed at high temperatu…
The column in an amine unit where the gas contacts the amine solution to have H2S/CO2 absorbed. A column used to strip volatile components from a liquid using steam or gas (e.g., Sour Water Stripper). A facility used to boost the pressure of the fluid in the pipeline to keep it moving efficiently. See **Metering Station**. A slug catcher is a large vessel or piping array located at the outlet of a multiphase pipeline (receiving terminal). Its volume is designed to buffer large 'slugs' of liquid that accumulate in th…
A unit (Glycol Dehy) using Triethylene Glycol (TEG) to absorb water vapor from natural gas to meet pipeline specs. See **Absorber Tower**. The part of the Dehy unit where the wet glycol is heated to boil off the water so it can be reused. A Vapor Recovery Unit (VRU) is a compression system designed to capture low-pressure flash gas from storage tanks that would otherwise be vented or flared. It compresses this gas and discharges it…
The large furnace that heats crude oil to ~350°C before it enters the atmospheric distillation tower. Any furnace in a plant (Reboiler heater, Charge heater) that uses open flame. Electrical cables or steam tubes wrapped around pipes to keep the fluid warm and prevent freezing or wax deposition. A large structure used to reject heat from the plant's cooling water system to the atmosphere via evaporation. Large centrifugal pumps that circulate cooling water through the plant's heat exchangers. The large safety flare stack for the entire refinery complex. A tall distillation column used to separate multiple products based on boiling point (e.g., FCC Main Fractionator). A processing unit that cracks heavy molecules in the presence of hydrogen at high pressure (2000+ psi). It makes high-quality diesel and jet fuel. A coker (Delayed Coking Unit) is a thermal cracking process used to upgrade the heaviest, lowest-value residue from the bottom of the distillation column ('bottom of the barrel'). It heats the res…
See **Coker Unit**. See **Fluid Catalytic Cracking**. A unit that removes ammonia and H2S from process water ('sour water') so it can be reused or disposed of safely. A process unit (Claus plant) that converts highly toxic Hydrogen Sulfide (H2S) gas removed from product streams into elemental sulfur (yellow blocks). This is crucial for environmental compl…
The catalytic reactor stage of the Sulfur Recovery Unit (SRU) where H2S and SO2 react to form elemental sulfur. Large centrifugal or reciprocating compressors used to move gases (hydrogen, fuel gas, wet gas) through the process. Steam turbines often typically used to drive large pumps and compressors in the refinery, utilizing the plant's steam system. The utility plant that generates high-pressure steam for power and process heating. The vessel in a boiler where steam separates from boiling water. A pig launcher is a pressurized vessel or barrel installed at the upstream end of a pipeline used to insert a pipeline inspection gauge ('pig') into the line without stopping the flow of product. …
See **Pig Trap**. A pig receiver is specifically the trap at the end of the pipeline segment. It typically has a larger barrel diameter than the pipeline to allow the pig to slide in and stop with…
A 'Pig' (Pipeline Inspection Gauge) is a device inserted into a pipeline and driven by fluid pressure. Utility pigs clean the line using brushes or scrapers. Smart pigs (In-Line Inspection, …
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. In midstream operations, compressors are essential for transporting natural gas through pipelines b…
Systems (CPM software, acoustic sensors) used to identify and locate leaks in a pipeline rapidly. The act of running a pig through the pipeline for cleaning or inspection. An isolation valve (Gate or Ball) used to stop flow in a pipeline segment. A valve that allows flow in only one direction (e.g., Swing Check, Wafer Check). Vital for preventing backflow. A cleaning pig equipped with steel brushes or urethane blades to scrape wax and scale from the pipe wall. A specialized machine used to drill into a pressurized pipeline (`hot tap`) to create a new branch connection without shutting down flow. Equipment used to insert a plug into a live pipeline (after hot tapping) to isolate a section for repair. Used to heat heavy crude oil to reduce its viscosity so it can be pumped efficiently. See **Production Meter Run**. Signs placed above buried pipelines to warn excavators of their presence ('Call Before You Dig'). The overall system (rectifiers, anodes, test posts) used to prevent pipeline corrosion. The power supply for an Impressed Current Cathodic Protection (ICCP) system. Converts AC mains power to DC. A group of anodes buried in the ground (`groundbed`) to discharge current onto the pipeline. See **Smart Pig**. An Intelligent Pig (MFL or UT) that records data on the pipe's condition as it travels. Pipeline coating is the first line of defense against external corrosion. Common coatings include Fusion Bonded Epoxy (FBE), 3-Layer Polyethylene (3LPE), and coal tar enamel. The coating mus…
See **Pig Trap**. The polyurethane cup on a pig that seals against the pipe wall to provide the drive force. A solid urethane disc used on pigs for support and sealing. Wire brushes attached to a pig to scrub hard deposits (scale, rust) from the pipe. A soft aluminum plate on a pig. If it comes out bent/damaged, it indicates a restriction or dent in the pipeline. A device inside the pig that emits an electromagnetic signal so the pig's location can be tracked from surface. See **Pig Receiver**. The frame/body of the pig. See **Pig Launcher**. A piping loop around a station or valve to allow flow to continue during maintenance. High-pressure plugs (e.g., smart plugs) used to isolate pipeline sections for hydrotesting or repair. Displacing hydrocarbons with inert nitrogen gas before maintenance to prevent explosive atmospheres. High-pressure filling and pressurization pumps used for commissioning pipelines. Air compressors and desiccant dryers used to remove all moisture from a pipeline after hydrotesting. A handheld receiver used by field crews to detect the passage of a pig at various checkpoints. A split-sleeve mechanical clamp bolted over a leak for a temporary or permanent repair. A steel sleeve welded over a damaged section (dent or corrosion) to reinforce it ('Type B sleeve'). Precision thread gauges used to verify the dimensions of API threaded connections. A small valve used to draw fluid samples from the line safely. Standard dial gauge (Bourdon tube) for visual pressure indication. Any instrument measuring fluid flow rate. A highly accurate mass flow meter that measures density and mass flow directly using the Coriolis effect. Unaffected by flow profile. A volume flow meter where fluid spins a rotor; speed is proportional to velocity. An automated valve (usually Globe type) used to throttle flow to control pressure, level, or flow rate. The device that moves the valve. Can be pneumatic (diaphragm/piston), hydraulic, or electric. A sensor that measures liquid level in a tank or vessel and transmits a 4-20mA signal. Technologies include Radar, Ultrasonic, and Differential Pressure. A sensor measuring pressure (gauge or absolute) and sending an electronic signal to the control system. A device that converts the signal from a temperature probe (RTD/TC) into a standard transmission signal. A flat plate with a hole used to measure flow. It creates a pressure drop which is measured by a DP cell. A non-intrusive meter using sound waves (transit time or Doppler) to measure fluid velocity. A flow meter that measures the frequency of vortices shed by a bluff body in the flow stream. A transmitter measuring the difference in pressure between two points (e.g., across a filter or orifice plate). Resistance Temperature Detector. A precise temperature sensor that changes resistance with temperature (e.g., Pt100). A robust temperature sensor made of two dissimilar metals joined at one end. An opening on a tank roof used for manual dipping (gauging) and sampling. A transparent tube on the side of a vessel allowing operators to see the liquid level directly. Equipment (deadweight tester, dry block) used to verify instrument accuracy. A paper-based recorder used for pressure tests (e.g., Barton recorder). A precise handheld digital pressure measuring device. A specialized computer that calculates flow rate and total volume based on inputs from meters, pressure, and temperature sensors (`AGA 3/8 calculations`). A mechanical switch that makes/breaks a contact at a set pressure (e.g., to start a compressor). A switch triggered by liquid level (e.g., High Level Shutdown float). A switch triggered by temperature (thermostat). A small building housing process analyzers (GCs, moisture analyzers) to protect them from weather. A set of valves (3-way or 5-way) allowing a transmitter to be isolated and calibrated without shutting down the process. Small diameter stainless steel tubing (usually 3/8 or 1/2 inch) connecting process lines to instruments. Removes moisture from compressed air to prevent condensation in pneumatic instrument lines. Reduces air supply pressure to the required level for valve actuators. Removes dust and oil from instrument air. An enclosure where field instrument cables are marshaled before going to the control room. Supports and protects electrical cables running through the plant. Dedicated 'clean earth' ground to prevent electrical noise affecting sensitive signals. The workbench in the workshop with precision standards for testing instruments. Supervisory Control and Data Acquisition. The overarching system for monitoring remote sites. Programmable Logic Controller. A rugged industrial computer used for local automation logic. Human Machine Interface. The screen (touch panel or PC) operators use to interact with the PLC. Remote Terminal Unit. A specialized telemetry unit for remote well sites, often solar powered. Distributed Control System. The large-scale control system used in refineries and major plants. The communications infrastructure (Radio, Satellite, Cell) sending data from RTU to SCADA. A cabinet containing the PLC, fuses, relays, and terminals. Software logic that alerts operators to abnormal conditions. Safety Instrumented System (SIS) responsible for Emergency Shutdown (ESD) logic. A dedicated panel monitoring smoke and gas detectors. Database software that stores years of process data for trending and analysis. Connects industrial ethernet devices. Provides secure connectivity (VPN) for remote access. A common serial communication protocol used in industrial automation. Software bridge allowing different control systems to exchange data. The actual code (Ladder Logic, Function Block) running in the PLC. Viewing plant status from off-site. See **Control Panel**. Compressors and dryers dedicated to supplying clean air for valves. The desk setup with multiple monitors where control room operators work. High-speed glass cabling used for the plant backbone network. See **Network Switch**. Industrial Wi-Fi allowing operators to use tablets in the field. An electrically operated switch used to isolate low-power control signals from high-power loads. Input/Output cards on a PLC that wire to field sensors and valves. The main computer hosting the SCADA application database. A viewing terminal for SCADA data. Dedicated server for long-term data archival. A panel with light tiles that flash and buzz when a fault occurs. Uninterruptible Power Supply (batteries) keeping the control system alive during a power outage. Climate control to keep electronics cool and operators comfortable. Clean agent suppression (e.g., FM-200) to strip oxygen/heat without damaging electronics. Cameras monitoring the process plant. Card readers restricting entry to authorized personnel. 24/7 rated ergonomic chairs for operators. Dimmable, low-glare lighting to reduce fatigue. Personal Protective Equipment (PPE) refers to the gear worn by workers to minimize exposure to hazards that cause serious workplace injuries and illnesses. In the oilfield, standard PPE includes h…
Impact protection for the head. FRC coveralls that self-extinguish when removed from a flame source. Load-bearing straps worn when working at height. See **H2S Monitor**. While personal monitors are worn by individuals, fixed gas detection systems are permanently installed sensors located around the rig or facility (e.g., at the shakers, bell n…
An H2S monitor is a personal safety device worn by workers to detect the presence of Hydrogen Sulfide gas, a deadly, colorless, and corrosive hazard common in oil and gas operations ('sour gas'). …
Automatic foam or water deluge system. A Permit to Work (PTW) is a formal documented system used to control high-risk activities. Before starting tasks like Hot Work (welding/grinding), Confined Space Entry, or bypassing safety systems…
LOTO. Procedure to isolate energy sources. Authorization to use ignition sources (welding, grinding). Procedures for entering tanks/vessels (ventilation, gas testing). ESD. The system that stops the plant and isolates inventory in an emergency. SCBA or airline mask providing fresh air in toxic atmospheres. Handheld dry chemical or CO2 unit. Deluge shower to wash off chemical spills. Device to flush eyes with saline or water. Fall protection refers to the systems used to prevent workers from falling from heights or to arrest a fall if it occurs. In the oilfield (derricks, tank batteries), 100% tie-off is mandatory abov…
Tape or rigid barricades to exclude people from hazards. HazCom / WHMIS. Labeling and SDS sheets. JSA/JHA. A pre-task risk assessment. Earplugs or muffs. Polycarbonate visor protecting face from grinding sparks or chemical splash. Nitrile or neoprene gloves. A mask with filters (e.g., N95) or cartridges for organic vapors. SCBA. Tank-on-back air supply. Fire-retardant blanket to smother small fires. Ventilation fan ('bug blower') to disperse gas. See **Muster Point**. Warning signs (No Smoking, PPE Required). Battery-backed lights that turn on when power fails. Medical supplies. Defibrillator for cardiac arrest. Rolled up fire hose. Connection point to the fire water ring main. Manual call point. See **Flame-resistant clothing**. Steel-toe, anti-static footwear. High-traction mats for rig floors. Non-Destructive Testing. Testing materials without damaging them. Ultrasonic Testing (UT) is a non-destructive testing method that uses high-frequency sound waves to detect internal flaws or measure material thickness. A transducer transmits sound energy into th…
See **Magnetic Particle Inspection**. Radiographic Testing (RT) involves using X-rays or Gamma rays to view the internal structure of a component. In the oilfield, it is the 'gold standard' for verifying pipeline weld quality. R…
Eddy Current Testing (ECT) uses electromagnetic induction to detect flaws in conductive materials. A coil carrying AC current creates a magnetic field that induces eddy currents in the test piece.…
The most basic NDT method. Looking for visible signs of damage, corrosion, leaks, or deformation. See **Hardness Tester**. See **Dye Penetrant Inspection**. Using a high-voltage spark ('jeep') to find pinholes (holidays) in pipeline coatings. See **Hydrostatic Test**. Checking tank floor welds by applying a vacuum over a soapy solution to see bubbles. Visual or NDT check of weld quality. Using automated UT to create a color-coded map of wall thickness loss. See **Ultrasonic Thickness Gauge**. Overall assessment of pipeline health (DCVG, CIPS). Checking the pipe-to-soil potential (-850mV) to verify protection. Checking paint thickness (DFT) and adhesion. Monitoring pump/compressor vibration to detect bearing faults. Using IR cameras to find hot spots (electrical faults, insulation gaps). Visual inspection of internals (engines, pipes) using a flexible camera. Aligning motor/pump shafts to micron precision to prevent vibration. Advanced UT using multiple beams to image defects in 3D. TOFD. Accurate sizing of crack depth using diffracted waves. MFL. The technology used in smart pigs to find corrosion. Listening for the sound of cracks growing or leaks hissing under pressure. See **Hydrostatic Test**. Pressure testing with gas (nitrogen/air). Dangerous due to stored energy. Verifying a valve seals tight. Using MFL scanners to check tank bottoms for soil-side corrosion. Using UAVs to inspect flare tips and tall structures. Using climbing techniques (abseiling) to reach inspection points. Pressure Vessel Inspection Code. Piping Inspection Code. Tank Inspection Code. Risk Based Inspection (RBI). API 579. Engineering analysis to decide if damaged equipment can keep running. Checking steel structures for rust/cracks. Creating a 3D digital twin of the reservoir. EOR. Tertiary recovery methods (CO2, Chemical, Thermal). Injecting water to support pressure and sweep oil. Re-injecting produced gas for pressure maintenance or storage. Injecting steam (SAGD, CSS) to lower viscosity of heavy oil. Running computer models to predict future production. DCA. Fitting a curve to production history to forecast reserves (Arps equations). Pressure-Volume-Temperature. Lab study of fluid phase behavior. Cutting a cylinder of rock from the formation for lab testing. Pushing fluid through a core plug in the lab to measure permeability. Interpreting pressure build-up/draw-down data (Horner plot) to find skin and permeability. Analyzing the entire production system (inflow + outflow) to find the bottleneck. Running a spinner tool to see which zones are contributing flow. Monitoring pressure, rate, and water cut over time. PTA. See **Well Test Analysis**. Accounting for all fluids in vs. fluids out to estimate original oil in place. Drawing contour maps of porosity, saturation, and thickness. Defining the equation of state for the oil/gas. 4D Seismic or observation wells. Selecting pumps/gas lift to match reservoir potential. Static Bottom Hole Pressure (SBHP) test. Taking a bottle of oil at depth. See **Core Flooding**. Measuring void space in core. Determining oil vs. water fraction (Archie's equation). Identifying if the well is driven by gas cap, water drive, or solution gas. The digital grid file (Eclipse/CMG deck). See **Decline Curve Analysis**. Modeling the geometry of hydraulic fractures. PI. Barrels per day per psi of drawdown. IPR curve. Relationship between flowing pressure and rate. VLP (Vertical Lift Performance) curve. Pressure loss in the tubing. Designing the frac job. How much of the oil is contacted by the waterflood. Studying geological variations (channels, barriers) that affect flow. Checking if the field is broken into isolated blocks. Blocking off water-producing high-perm zones (thief zones) to force water into oil zones. Cathodic protection (CP) is an electrochemical technique used to control corrosion on buried or submerged pipelines. It works by making the pipeline the cathode of an electrochemical cell. '…
A valve station (or block valve station) is a facility located at intervals along a pipeline containing isolation valves. In the event of a rupture or leak, these valves can be closed (often remot…
A metering station (or custody transfer station) is where the quantity and quality of the product are measured as it changes ownership (e.g., from producer to pipeline company). It uses high…
SCADA (Supervisory Control and Data Acquisition) is the computer system used to monitor and control pipeline operations remotely from a central control room. It collects data from sensors (pressur…
Fluid Catalytic Cracking (FCC) is one of the most important conversion processes in a refinery. It breaks heavy, low-value hydrocarbon molecules (vacuum gas oil) into lighter, high-value products …
Catalytic Reforming is a process used to convert low-octane naphthas (straight-run gasoline) into high-octane liquid products called reformates, which are premium blending stocks for gasoline. Alkylation is the process of combining light olefins (propylene, butylene) with isobutane to produce alkylate, a high-octane, clean-burning gasoline blending component. Unlike cracking (brea…
The tank farm (or offsites) is the storage area of the refinery, containing large atmospheric tanks for crude oil feed and finished products (gasoline, diesel, jet fuel). Managing the tank f…
Lockout/Tagout (LOTO) is a safety procedure used to ensure that dangerous machines are properly shut off and not able to be started up again prior to the completion of maintenance or servicing. Magnetic Particle Inspection (MPI) is an NDT method used to detect surface and near-surface discontinuities in ferromagnetic materials (steel). A magnetic field is induced in the part, and iron pa…
Dye Penetrant Inspection (DPI or PT) is a widely used low-cost inspection method to locate surface-breaking defects in non-porous materials (metals, plastics). A liquid penetrant is applied and al…
A fishing tool designed to catch small debris (junk) from the well. It works by reverse circulation or gravity. 'Boot baskets' are run on drilling assemblies to catch heavy cuttings that set…
A wireline tool that sprays a high-pressure jet of corrosive chemical (like Bromine Trifluoride) to slice through tubulars. It creates a very clean, flare-free cut, which is ideal if the cut…
The carrier fluid used in hydraulic fracturing. It typically consists of 99% water and sand, with 1% chemical additives. Fluid systems include 'Slickwater' (low viscosity, high velocity) for…
The mixing chamber on the frac blender unit where sand and gel meet. It uses paddles or augers to homogenize the slurry. Level control in the tub is crucial; running dry sucks air into the p…
A sand control method used in completions. A screen is placed in the wellbore, and sized gravel (coarse sand) is pumped into the annulus between the screen and the formation. The gravel acts…
A standard high-pressure pump used for acidizing. Similar to a frac pump but often made with acid-resistant alloys in the fluid end. A unit that converts liquid nitrogen (stored in cryogenic tanks) into high-pressure gas. Nitrogen is pumped to displace fluids, purge lines, or energize frac fluids (foam frac) to aid in flo…
A Sub-Surface Safety Valve (SSSV or SCSSV) is installed deep in the production tubing (usually below the permafrost or seabed). It is the final barrier to prevent blowout if the wellhead is sheare…
A centralized facility where produced fluids from one or more wells are separated, treated, and stored. It typically includes separators, heater treaters, and a row of stock tanks (battery).…
Lease Automatic Custody Transfer (LACT) unit. An automated system that measures the net volume and quality (sediment & water) of oil as it is transferred from the producer to the pipeline company.…
A device to measure gas flow rate. Common types include orifice meters (measuring differential pressure across a plate) and rotary meters. A positive displacement or turbine meter used to measure liquid oil volume. See **Pig Launcher**. See **Pig Receiver**. A process that distills the heavy residue from the atmospheric column under very low pressure (vacuum). Reducing the pressure lowers the boiling point. This allows heavy hydrocarbons to be v…
A gas treating unit that uses amine solutions (MEA, DEA) to absorb 'acid gases' (H2S and CO2) from natural gas or refinery gas streams (‘sweetening’). The rich amine is then regenerated by h…
A catalytic chemical process used to treat jet fuel and kerosene. It converts mercaptans (bad smelling sulfur compounds) into stable disulfides. It sweetens the product to meet odor and corr…
The main high-pressure water piping ring main around a facility that supplies fire hydrants, monitors, and deluge systems. It is kept pressurized by the Firewater Pump (jockey pump maintains…
Totally Enclosed Motor Propelled Survival Craft (TEMPSC). The primary means of evacuation from an offshore rig. They are fire-protected, self-righting, and equipped with air supplies to sail…
The designated safe area (Assembly Station) where the crew gathers during an alarm (General Alarm or Abandon Rig). Here, a head count is taken to ensure no one is left behind in a hazardous …
A handheld device used to measure wall thickness of pipes. It works by timing the reflection of a sound wave from the back wall. Used widely for corrosion monitoring (checking for wall thinn…
A device to measure the hardness of metal (Rockwell or Brinell scale). In the oilfield, hardness testing is critical for NACE compliance. Metals that are too hard are susceptible to Sulfide …
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Description: All aspects of well design are circular in nature, from drill pipe to casing and tubing, therefore most items can be described using a combination of Inner Diameter (ID) and Outer Diameter (OD). From…
Description: All aspects of well design are circular in nature, from drill pipe to casing and tubing, therefore most items can be described using a combination of Inner Diameter (ID) and Outer Diameter (OD). From…
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