BLOWOUT PREVENTER

摘要

A blowout preventer comprisi ng a main body (14), a ram apparatus (20,30,36) movable within the main body (14) to engage a tubular, a hydraulic circuit apparatus (106) for providing fluid under pressure to operate the ram apparatus (20,30,36), a bonnet (12) movably connected to the ma in body (14) for providing access to the ram apparatus (20), characterised in that the blowout preventer further comprises bonnet movement apparatus (8) and a valve apparatus (102,104), such that in use said valve apparatus (121) is used to selectively all ow hydraulic fluid to flow from. said hydraulic circuit apparatus (106) to said bonnet movement apparatus (8) to move said bonnet (12) to access the ram apparatus (20,30).