1) in drilling, a plastic mixture of cement and water that is pumped into a well to harden. There it supports the casing and provides a […]

Now commonly used as mud pit. Originally it was the pit in which clay and shale cuttings used to mix mud were stored.

The recording of the time required for a sound wave to travel a specific distance through a formation. Difference in observed travel times is largely caused […]

A fishing tool used to retrieve pipe lost in a well. The spear is lowered down the hole and into the lost pipe. When weight, torque, […]

The ratio of the weight of a given volume of a substance at a given temperature to the weight of an equal volume of a standard […]

An operation designed to indicate the point at which fluids are escaping from the wellbore into a cavernous or porous formation. Also used to determine point […]

A spool attachment on the makeup cathead to permit use of a spinning chain to spin up or make up drill pipe. See spinning chain.

A Y-shaped chain used to spin up (tighten) one joint of drill pipe into another. One end of the chain is attached to the tongs, another […]

A flanged joint with side outlets, also serving as a spacer, between rams in a blowout preventer stack or between stack and casinghead.

The forcing of cement slurry by pressure to specified points in a well to cause seals at the points of squeeze. It is a secondary cementing […]

A temporary platform erected in the derrick or mast some 20 to 40 ft (6-12 m) above the derrick floor. The derrickman or another crew member […]

A centralizer attached to the Drill Collar to center the bit in the hole. Stabilizers may be spaced out over the drill collar string to prevent […]