Oil & Gas Terms in Category B

Blowout preventer operating and control system

The assembly of pumps, valves, lines, accumulators, and other items necessary to open and close the blowout preventer equipment.

Also called closing unit.

Box tap

Old-style tap with longitudinal grooves across the threads.

See tap, taper tap.


Plates which change the direction of flow of fluids.

Blowout preventer rams

The closing and sealing components of a preventer, like the gate in a gate valve.


A device into which fit the slips or wedges which support tubing.


Variation of barite.

See barite.

Borehole pressure

Total pressure exerted in the wellbore by a column of fluid and/or back-pressure imposed at the surface.

Barrel equivalent

A laboratory unit used for evaluating or testing drilling fluids.

One gram of material, when added to 350 milliliters of fluid, is equivalent to 1 pound of material when added to one 42-gal barrel of fluid.

Batch treating

The process by which a single quantity of crude oil emulsion is broken into oil and water.

The emulsion is gathered and stored in a tank or container prior to treating.

Bury barge

A vessel used to bury pipeline beneath the seafloor.

The barge moves itself forward by means of anchors.

A jet sled is lowered over the pipeline, and as the barge pulls it over the pipe, high-pressure jets of water remove soil from beneath the pipe, allowing the pipe to fall into the jetted-out trench.



Bottom hole pressure.


To drain off liquid or gas, generally slowly, through a valve called a bleeder.

To bleed down, or bleed off, means to release pressure slowly from a well or from pressurized equipment.

Barite slurry

A mixture of barium sulfate, chemicals, and water of a unit density between 18 and 22 pounds per gallon


Water that has large quantity of salt, especially sodium chloride, dissolved in it, salt water.

Body lock ring

An internal mechanism employed in certain tools to lock cones to the mandrel