초록 ▼

A blowout preventer including, in certain aspects, a main body, a bonnet movably connected to the main body, the bonnet having a bonnet channel with interior threading, a ram shaft with a first portion extending through the main body and a second portion extending through the bonnet, the ram shaft h

A blowout preventer including, in certain aspects, a main body, a bonnet movably connected to the main body, the bonnet having a bonnet channel with interior threading, a ram shaft with a first portion extending through the main body and a second portion extending through the bonnet, the ram shaft having a ram shaft channel therein and an outer end, a ram connected to the ram shaft for selectively engaging a pipe, a locking assembly for selectively locking the ram shaft, the locking assembly including a torquing shaft with a portion within the ram shaft channel, the torquing shaft having an external end projecting beyond the bonnet, a locking shaft secured to the torquing shaft, the locking shaft having exterior threading for threadedly engaging the interior threading of the bonnet channel, and the locking shaft rotatable within the bonnet channel to abut the outer end of the ram shaft to releasably lock the ram shaft in position.

대표청구항 ▼

The invention claimed is: 1. A blowout preventer comprising a main body, a ram apparatus movable within the main body to engage a tubular, hydraulic circuit apparatus for providing fluid under pressure to operate the ram apparatus, a bonnet movably connected to the main body for providing access to

The invention claimed is: 1. A blowout preventer comprising a main body, a ram apparatus movable within the main body to engage a tubular, hydraulic circuit apparatus for providing fluid under pressure to operate the ram apparatus, a bonnet movably connected to the main body for providing access to the ram apparatus, the bonnet movable by fluid under pressure supplied by the hydraulic circuit apparatus, bonnet movement apparatus, the bonnet movement apparatus in fluid communication with the hydraulic circuit apparatus, the hydraulic circuit apparatus including valve apparatus, the valve apparatus selectively controlling flow of fluid under pressure to the bonnet movement apparatus to move the bonnet with respect to the body, and valve activation apparatus for manually activating the valve apparatus to open or close the bonnet further comprising the hydraulic circuit apparatus providing fluid for disengaging the ram apparatus from a tubular, a portion of said fluid for said disengaging useful for moving the bonnet, and the valve apparatus including a first valve and a second valve, the valve activation apparatus comprising a fulcrum member on the bonnet, a rocker plate mounted for rocking movement on the fulcrum member, the rocker plate movable in a first direction to contact the first valve to open the bonnet, the rocker plate movable in a second direction to contact the second valve to close the bonnet. 2. The blowout preventer of claim 1 wherein the bonnet movement apparatus includes a first piston/cylinder apparatus for moving the bonnet, and a second piston cylinder apparatus for moving the bonnet, the second piston/cylinder apparatus spaced-apart from the first piston/cylinder apparatus. 3. The blowout preventer of claim 1 wherein the ram apparatus includes a ram block with tubular engaging structure, the ram block and the tubular engaging structure having a block length, the hydraulic circuit apparatus provides fluid under pressure to disengage the tubular engaging structure from a tubular and to move the ram block away from the tubular, the bonnet movable by the bonnet movement apparatus a bonnet distance from the main body to provide access to the ram block. 4. The blowout preventer of claim 1 further comprising the bonnet having a bonnet channel with interior threading, the ram apparatus including a ram shaft with a first portion extending through the main body and a second portion extending through the bonnet, the ram shaft having a ram shaft channel therein and an outer end, a locking assembly for selectively locking the ram shaft, the locking assembly including a torquing shaft, a portion of the torquing shaft within the ram shaft channel, the torquing shaft having an external end projecting beyond the bonnet, a locking shaft secured to the torquing shaft, the locking shaft having exterior threading for threadedly engaging the interior threading of the bonnet channel, and the locking shaft rotatable within the bonnet channel to abut the outer end of the ram shaft to releasably lock the ram shaft in position. 5. The blowout preventer of claim 4 further comprising a ram connected to the ram shaft for selectively engaging a pipe, and the locking shaft rotatable to releasably lock the ram in position upon the ram engaging the pipe. 6. The blowout preventer of claim 4 further comprising spring apparatus urging the torquing shaft toward the ram shaft, inwardly of the bonnet. 7. The blowout preventer of claim 6 further comprising the spring apparatus also biasing the locking shaft inwardly and maintaining alignment of the exterior threading on the locking shaft and the interior threading of the bonnet channel. 8. The blowout preventer of claim 4 further comprising a hole through the external end of the locking shaft for receipt of an item for manual rotation of the locking assembly for selectively locking and unlocking the ram shaft. 9. A blowout preventer comprising a main body, a ram apparatus movable within the main body to engage a tubular, hydraulic circuit apparatus for providing fluid under pressure to operate the ram apparatus, a bonnet movably connected to the main body for providing access to the ram apparatus, bonnet movement apparatus, the bonnet movable by fluid under pressure supplied to the bonnet movement apparatus, the hydraulic circuit apparatus including valve apparatus, the valve apparatus selectively controlling flow of fluid under pressure to the bonnet movement apparatus to move the bonnet with respect to the body, and valve activation apparatus for manually activating the valve apparatus to open or close the bonnet, the blowout preventer further comprising the valve apparatus including a first valve and a second valve, the valve activation apparatus comprising a fulcrum member on the bonnet, a rocker member mounted for rocking movement on the fulcrum member, the rocker member movable in a first direction to contact the first valve to open the bonnet, and the rocker member movable in a second direction to contact the second valve to close the bonnet. 10. The blowout preventer of claim 9 wherein the ram apparatus includes tubular engagement apparatus and wherein hydraulic fluid under pressure supplied for operation of the ram apparatus to disengage the tubular engagement apparatus is also used to open and close the bonnet. 11. A method for releasably locking a ram shaft of a blowout preventer, the blowout preventer comprising a main body, a ram apparatus movable within the main body to engage a tubular, hydraulic circuit apparatus for providing fluid under pressure to operate the ram apparatus, the blowout preventer including a main body, a bonnet movably connected to the main body, the bonnet having a bonnet channel with interior threading, a ram shaft with a first portion extending through the main body and a second portion extending through the bonnet, the ram shaft having a ram shaft channel therein and an outer end, a locking assembly for selectively locking the ram shaft, the locking assembly including a locking member having exterior threading for threadedly engaging the interior threading of the bonnet channel, and the locking member rotatable within the bonnet channel so that the locking member abuts the outer end of the ram shaft to releasably lock the ram shaft in position, a ram on the ram shaft, the method comprisingmoving the ram and the ram shaft to a terminal position, moving the locking member to an entrance to the bonnet channel, threadedly engaging the exterior threading of the locking member with the interior threading of the bonnet channel, and rotating the locking member to abut the outer end of the ram shaft to releasably lock the ram shaft in position, and wherein the locking assembly includes a torquing shaft, a portion of the torquing shaft movable within the ram shaft channel, the torquing shaft having an external end projecting beyond the bonnet, the locking member including a locking shaft secured to the torquing shaft, and the locking shaft rotatable within the bonnet channel to move with the torquing shaft, the torquing shaft movable in the ram shaft channel, and wherein the blowout preventer includes spring apparatus urging the torquing shaft toward the ram shaft, inwardly of the bonnet, the method further comprising urging the torquing shaft toward the ram shaft with the spring apparatus. 12. The method of claim 11 wherein the spring apparatus also biases the locking shaft inwardly and maintains alignment of the exterior threading on the locking shaft and the interior threading of the bonnet channel, the method further comprising biasing the locking shaft inwardly with the spring apparatus and maintaining alignment of the exterior threading on the locking shaft and the interior threading of the bonnet channel. 13. The method of claim 11 wherein the ram apparatus includes a ram block with tubular engaging structure, the ram block and the tubular engaging structure having a block length, the hydraulic circuit apparatus provides fluid under pressure to disengage the tubular engaging structure from a tubular and to move the ram block away from the tubular, the bonnet movable a distance no further than the block length away from the main body by the bonnet movement apparatus to provide access to the ram block, the method further comprising moving the bonnet only a distance equal to the block length to provide access to the ram block. 14. The method of claim 11 wherein the hydraulic circuit apparatus provides fluid for disengaging the ram apparatus from a tubular, a portion of said fluid for disengaging useful for moving the bonnet, the method further comprising moving the bonnet with said portion of said fluid for disengaging.