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

A blowout preventer placed on the seafloor for use by a floating offshore drilling rig.

A blowout preventer that uses rams to seal off pressure on a hole that is with or without pipe. also called a ram preventer.

1. one of several valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and drill pipe or in open hole (i.e., hole with no drill pipe) during drilling completion operations. blowout preventers on land rigs are located beneath the rig at the land’s surface; on [...]

A dart-shaped drill pipe inside blowout preventer installed on top of the drill stem when the well is kicking through the drill stem. it is stabbed in open then closed against pressure.

Any valve installed in the drill stem to prevent a blowout through the stem. mud can be pumped in but flow back up the stem is prevented. also called an internal blowout preventer.

1. an uncontrolled flow of gas, oil, or other well fluids into the atmosphere or into an underground formation. a blowout, or gusher, can occur when formation pressure exceeds the pressure applied to it by the column of drilling fluid.
2. an uncontrolled flow of reservoir fluids into the wellbore, and sometimes catastrophically to the surface. [...]

Controls, usually located near the driller’s position on the rig floor, that are manipulated to open and close the blowout preventers. see blowout preventer.

A device that stores hydraulic fluid under pressure in special containers and provides a method to open and close the blowout preventers quickly and reliably. usually, compressed air and hydraulic pressure provide the opening and closing force in the unit. see blowout preventer.

A training procedure to determine that rig crews are completely familiar with correct operating practices to be followed in the use of blowout prevention equipment. a “dry run” of blowout preventative action.

The assembly of well-control equipment including preventers, spools, valves, and nipples connected to the top of the wellhead.

Abbreviation: blowout preventer.

See inside blowout preventer.

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

A fitting placed in the blowout preventer stack to provide space between preventers for facilitating stripping operations, to permit attachment of choke and kill lines, and for localizing possible erosion by fluid flow to the spool instead of to the more expensive pieces of equipment.