Calculations Home

Total Calculations available: 22

• Title: Annular Capacilty
  Description: The volume of fluid required to fill an annular void between two cylinders
• Title: Pump Output
  Description: The volumetric output of a pump based on the liner size. The result is given in theoretical 100% and a realistic 98%
• Title: Hydrostatic Pressure
  Description: The hydrostatic pressure at a given depth created by the weight of a vertical column of fluid
• Title: Slug Volume
  Description: The volume of slug required to create a desired length of dry pipe prior to pulling out of hole whist maintaining the same bottom hole pressure.
• Title: Pit Gain Due to Slug U-Tubing
  Description: The expected rise in pit level after pumping a slug. This can be used to determine whether the well is still static prior to pulling out of hole
• Title: New Pump Pressure with Pump Rate Change
  Description: When a pump rate is changed, the pump pressure will change correspondingly. This approximate calculation can be used to determine the new pump pressure for the new pump rate.
• Title: New Pump Pressure with Mud Weight Change
  Description: When you change the mud weight, the pump pressure will make a corresponding pressure change
• Title: Buoyancy Factor / Buoyant Weight of String
  Description: When running items in a fluid, the weight is reduced due to the buoyancy force acting on it
• Title: Annular Pressure Loss and ECD
  Description: This approximate calculation gives an idea of annular pressure loss, however this should just be used as a guide as it ignores variables such as, length of BHA, washouts in the open hole and solids l…
• Title: Kick Tolerance
  Description: A kick tolerance calculation based on calculating the kick volume required to breakdown the shoe strength in two ways and outputting the lower value. Kick tolerance is calculated with a gas influx…
• Title: Free Point of Stuck Pipe
  Description: Using over pull data to determine the amount of free pipe above a stuck point
• Title: Volume of Barite Required to weight up mud system
  Description: How much bulk barite is required to be onboard to weight up the active system. For well control purposes there should always be enough barite to weigh up the active system by 1ppg
• Title: Bulk Cement Requirement for Well Control
  Description: Most well control policy dictates there should be sufficient cement onboard to place a 500ft plug in the open hole
• Title: Drillbit Hydraulics
  Description: A calculator to establish TFA and its effect on bit hydraulics, namely pressure drop, HSI and impact force
• Title: TFA
  Description: The total flow area of all the nozzles in a drillbit. For calculation purposes, fill all inputs and put 0 for excess nozzles.
• Title: Bottoms Up
  Description: Time to circulate fluid from the bottom of the hole to surface
• Title: Strokes per minute (SPM) for a given Annular Velocity
  Description: Calculate the minimum pump rate required to obtain a desired annular velocity
• Title: Balanced Cement Plug
  Description: The volume of cement required to place a balanced cement plug, including placement volumes. This calculator assumes plugs are set entirely in Open Hole or Cased Hole
• Title: Lost Returns equivalent Mud Weight
  Description: After losing returns and the well annulus has been topped up with water. This calculation will provide an equivalent mud weight at TD that can be used to help determine the fracture/loss pressure
• Title: Casing Burst (Gas to Surface)
  Description: A check to see if the casing can handle Gas to Surface from the reservoir without losing its integrity
• Title: Brine Density with Temperature Correction
  Description: Temperature has an effect on brine density and requires the brine weight at surface to be mixed higher than required. This calculation determines surface brine weight needed for the temperature corre…
• Title: Cuttings Volume while Drilling
  Description: Volume of cuttings generated per hour that is removed from the hole while drilling. This calculation allows you to check whether the surface system can handle the level of cuttings or whether they …