초록 ▼

An improved blowout preventor actuator is provided for opening and closing a ram block within a blowout preventor body to control the flow of well fluid. The working or power piston within the actuator cylinder is provided with one or more axially extending cavities each for receiving a locking rod

An improved blowout preventor actuator is provided for opening and closing a ram block within a blowout preventor body to control the flow of well fluid. The working or power piston within the actuator cylinder is provided with one or more axially extending cavities each for receiving a locking rod secured at one end to the cylinder head. To prevent inadvertent opening of the ram block, locking segments carried by the power piston repeatedly disengage one locking surface and re-engage an adjacent locking surface on the locking rods as the power piston and ram block secured thereto move to the ram closed position. To unlock the power piston from the locking rods, fluid pressure is applied to an unlocking piston which radially moves the locking segments out of engagement with the locking rods. The locking surfaces on the locking rods extend axially along a length which allows different ram blocks to be substituted for sealing with various diameter tubular members passing through the blowout preventors. The simple yet highly reliable technique for preventing opening of the BOP ram block increases safety and reduces manufacturing and operating costs.

대표청구항 ▼

A fluid-powered blowout preventor actuator for reciprocating a ram block within a blowout preventor body in response to a pressurized fluid source to control flow of well fluids through the blowout preventor, the blowout preventor having a through passageway for receiving tubular members extending i

A fluid-powered blowout preventor actuator for reciprocating a ram block within a blowout preventor body in response to a pressurized fluid source to control flow of well fluids through the blowout preventor, the blowout preventor having a through passageway for receiving tubular members extending into a well bore, the blowout preventor actuator comprising: a cylinder having an inner bore defining an axis; a power piston axially movable within the cylinder bore from a ram open position to a ram closed position, the power piston having a plurality of axially extending locking rod cavities therein; a cylinder head for sealed engagement with an end of the cylinder; a ram shaft extending from the cylinder for mechanically interconnecting the power piston and the ram block; a plurality of locking rods each secured at a first end to the cylinder head and having an opposing second end movable within the corresponding axially extending cavity of the power piston, each locking rod having a multiplicity of axially spaced locking surface thereon; a plurality of locking segments each carried by the power piston and having a mating surface for locked engagement with a locking surface of a corresponding locking rod to prevent the power piston from moving within the cylinder bore to open the ram block; and an unlocking unit for selectively moving each of the locking segments out of engagement with the locking rods to unlock the power piston from the locking rods.