The annular blowout preventer must be equipped with a hydraulic control system before it can be used alone. It is usually used together with the ram blowout preventer, or it can be used alone.

The annular BOP can complete the following operations: sealing Kelly, drill pipe joint, drill collar, casing, cable and other tools of various shapes and sizes; When there is no drilling tool in the well, the wellhead can be completely sealed; Under the control of hydraulic control device with pressure reducing regulating valve or buffer accumulator, the drilling tool can be forcibly lifted and lowered through the drill pipe joint of 18 ℃ shoulder.

Technical features

◆ The shell and top cover are connected by claw plate, which is reliable, evenly stressed and easy to assemble and disassemble

◆ The top cover is equipped with a piston stroke detection hole to monitor the rubber core wear