The process of running the drillstring into or out of the well under “Kick” conditions (see Kick). Normally through a closed annular BOP but may be […]

A petroleum trap that is formed because of deformation (such as folding or faulting) of the reservoir formation. Compare stratigraphic trap.

Drill pipe, drill collars, casing, or tubing that has inadvertently become immovable in the hole. Sticking may occur when drilling is in progress, when casing is […]

A short, threaded piece of pipe used to adapt parts of the drilling string that cannot otherwise be screwed together because of differences in thread size […]

A mobile bottom-supported offshore drilling structure with several compartments that are flooded to cause the structure to submerge and rest on the seafloor. Submersible rigs are […]

The foundation on which the derrick or mast and usually the drawworks sit. It contains space for storage and well control equipment.

Also called a suction tank, sump pit, or mud suction pit. See suction tank.

The mud tank from which mud is picked up by the suction of the mud pumps. Also called a suction pit.

The first string of casing (after the conductor pipe) that is set in a well. It varies in length from a few hundred to several thousand […]

Increased hydrostatic wellbore pressure caused by downward pipe movement.

Lowered hydrostatic wellbore pressure caused by upward pipe movement.