An instrument that measures fluid pressure and usually registers the difference between atmospheric pressure and the pressure of the fluid by indicating the effect of such […]

A scale of pressure differences in which there is a uniform variation of pressure from point to point. For example, the pressure gradient of a column […]

A valve that opens at a preset pressure to relieve excessive pressures within a vessel or line. Also called a pop valve, relief valve, safety valve, […]

Shortened form of blowout preventer. See Blowout Preventer.

The cementing operation that takes place immediately after the casing has been run into the hole. It provides a protective sheath around the casing, segregates the […]

An internal-combustion engine or a turbine that is the source of power for driving a machine or machines.

1) the phase of the petroleum industry that deals with bringing the well fluids to the surface and separating them and with storing, gauging, and otherwise […]

See propping agent.

A granular substance (sand grains, aluminum pellets, or other material) that is carried in suspension by the fracturing fluid and that serves to keep the cracks […]

A string of casing set to protect a section of the hole and to permit drilling to continue to a greater depth. Sometimes called “protection string” […]

A device that increases the pressure on a fluid or raises it to a higher level. Various types of pumps include the bottomhole pump, centrifugal pump, […]