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Oil Authority›Glossary›B›Blowout Preventer Stack

Blowout Preventer Stack

Well Control

The stacked arrangement of well control equipment including annular preventers, ram preventers, diverter spools, valves, and nipples. Also known as BOP Stack.

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Related Terms

Lower Kelly Cock

A ball valve installed at one end of the kelly that can be used to stop mud draining from the kelly during a connection.

Mud-Gas Separator

A device that removes gas from the mud coming out of a well when a kick is being circulated out.

Ram

The closing and sealing component on a blowout preventer. Types include blind, pipe, or shear rams.

Upper Kelly Cock

A valve installed above the kelly that can be closed manually to protect the rotary hose from high pressure in the drill

BBL or bbl

An abbreviation for oilfield barrel, a volume of 42 US gallons [0.16 m3].

BGG

An average or baseline measure of gas entrained in circulating mud. This baseline trend pertains to gas that is liberate

BHA

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BHCT

The temperature of the circulating fluid (air, mud, cement or water) at the bottom of the wellbore after several hours o

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