Slug

Drilling related fluid for pulling dry pipe

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 is mixed in the pill pit by adding additional weighting material (barite) to a few barrels of mud from the surface pits.

The pill is pumped into the top of the drillstring to push mud downward, out of the pipe, thus keeping the upper stands of pipe empty. This results in having two different fluid heights (inside the pipe and in the annulus) whilst maintaining bottom hole pressure constant.