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Rod lock for ram blowout preventer

A technology of blowout preventer and ram, which is applied in the direction of wellbore/well components, sealing/isolation, earthwork drilling and production, etc. It can solve the problems of insufficient optimization and catastrophic release of wellbore fluid, etc.

Inactive Publication Date: 2008-08-06
海德尔有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although promising, since these solutions exhibit a small amount of slippage or "play" in the opposite direction (known as backlash) before engaging and locking the pushrod 126 in place, So each of these scenarios is accounted for by many factors that are not fully optimized
In the event of a high pressure "kick" to the wellbore, even a tiny displacement of the ram 120 associated with the pushrod 126 could result in a catastrophic release of wellbore fluids

Method used

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  • Rod lock for ram blowout preventer
  • Rod lock for ram blowout preventer

Examples

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Embodiment Construction

[0019] Referring to FIG. 2 herein, a schematic diagram of a push bar lock 250 according to an embodiment of the present invention is shown. In this embodiment, the push rod lock 250 is preferably located within a piston ram housing (eg, 104 of FIG. 1 ) in a fixed position about the push rod 226 . The push rod lock 250 needs to be configured to allow displacement of the push rod 226 in the locking direction 254 but not allow displacement of the push rod 226 in the unlocking direction 254 . Push bar lock 250 includes a body 256 in which one or more roller receptacles are formed. Roller container 258 is shown including deep portion 260 extending to shallow portion 262 through sloped surface 264 .

[0020]Likewise, each roller receptacle 258 is configured for retaining and disposing a roller 266 within and deploying from the receptacle 258 when it is desired to selectively lock the push rod 226 . In particular, when the roller 266 is located in the deep portion 260, substantiall...

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Abstract

A blowout preventer (100) to hydraulically seal a wellbore includes a housing (102) configured to be positioned above a wellhead and to surround a drillstring (112), a plurality of rams (120) positioned perpendicular to an axis (114) of the drillstring to engage the drillstring (112) and hydraulically isolate an annulus (116) between the wellbore and the drillstring (112) when in a closed position, and a roller lock (350, 250) positioned about a thrust rod (326, 226, 126) of each ram (120) configured to maintain the rams (120) in the closed position.

Description

technical field [0001] The present invention generally relates to a locking mechanism for a blowout preventer used in the petroleum exploration and extraction industry. More specifically, the present invention relates to a roller lock mechanism that prevents undesired reversal of the pushrod of a ram-type blowout preventer. Background technique [0002] Wellbores are drilled deep into the earth's crust to access hydrocarbon deposits buried in the underlying formations. Typically, these wellbores are drilled by equipment that rotates a drill bit at the end of a long bundle or string called a drill string. Because of the energy and friction involved in such operations, drilling fluid, commonly referred to as drilling mud, is used to lubricate and cool the drill bit as it cuts the underlying rock formation. In turn, the drilling mud can perform the secondary function of moving drill cuttings from the bottom of the wellbore to the surface. Typically, drilling mud is delivered...

Claims

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Application Information

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IPC IPC(8): E21B33/06
Inventor 罗伯特・阿诺德・加杰米歇尔・怀纳・伯克霍夫
Owner 海德尔有限责任公司