Definition – What does Inside Blowout Preventer mean?
Inside Blowout Preventer is a valve which is used to prevent wells from unconditionally flowing up the drill string. It is held with a dart in an open position to allow stabbing. The flow is shut off on turning the release handle after stabbing. The stabbed body can be removed and the drill string can be connected again to reestablish the pressure stabilization. Then the valve can be removed and returned to a ready state or left in the drill string to ensure downward flow only.
Petropedia explains Inside Blowout Preventer
Inside Blowout Preventer is also known as internal blowout preventer. It is mainly used in drilling operations when a blowout occurs. The tool is connected to a drill pipe to release the pressure. This type of valve protects the rotary swivel, standpipe, mud pipes and drilling hose when a kick occurs in the drill string. It seals against the pressure till 69MPa and permits the downward flow of the circulation fluid via drill pipe while preventing the upward flow after circulation stops. Inside Blowout Preventers are always on working floor near a rotary table.