Abnormal pressure is a term used to describe pressures that might exist in wellbores that are greater than an expected, naturally occurring hydrostatic pressure.

A measure of the ability of a single fluid (such as water, gas, or oil) to flow through a rock for mation when the formation is […]

The percentage of the total bulk volume of a rock sample that is composed of pore spaces or voids. See porosity.

An AC drive is a system for controlling the rotational speed and/or torque of an alternating current (AC) electric motor by controlling the frequency of the […]

A pressure vessel charged with nitrogen gas and used to store hydraulic fluid under pressure for operation of blowout preventers.

An assemblage of multiple accumulators sharing a common manifold.

A hydraulic power unit with accumulators, pumps control fluid reservoir and hydraulic control manifold for operation of blowout preventers.

A record of the measurement of porosity, done by comparing depth to the time it takes for a sonic impulse to travel through a given length […]

An additional device that can be installed on a passive heave compensator system, such as a crown-mounted or drill string compensator. It is designed to improve […]

A drawworks with an advanced controls system and additional power to provide the heave compensation of the string on a floating vessel instead of the traditional […]

An accumulator system is regarded as adiabatic when the pressure change is fast enough that no significant heat is transferred between the outside environment and the […]

A choke in which the position of a conical needle, sleeve, or plate may be changed with respect to their seat to vary the rate of […]