Self-balanced underground full-bore check valve

A single-flow valve and full-bore technology, which is applied to wellbore/well valve devices, wellbore/well components, earthwork drilling and production, etc., can solve the problems of prolonging construction operation time, reducing operation efficiency, increasing operation cost, etc. problems, to achieve the effect of improving production safety, improving work efficiency and shortening working time

Active Publication Date: 2012-04-18
HUNAN GANGTUO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many disadvantages in eliminating well control risks by shutting in and killing wells: first, the pressure change in the well cannot be known in time, resulting in a delay in ...

Method used

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  • Self-balanced underground full-bore check valve
  • Self-balanced underground full-bore check valve
  • Self-balanced underground full-bore check valve

Examples

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Embodiment Construction

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0027] like figure 1 and figure 2 As shown, according to the embodiment of the present invention, the self-balancing downhole full-bore check valve includes a first joint 10 and a second joint 20, and the first ends of the first joint 10 and the second joint 20 are fixedly connected, and the fixed connection The method is, for example, welding. An accommodating chamber 21 is formed in the second joint 20 , and an on-off valve 30 is disposed in the accommodating chamber 21 . A sliding sleeve 40 is disposed in the annular cavity formed by the on-off valve 30 and the second joint 20 . The sliding sleeve 40 is sleeved on the on-off valve 30 and can slide along the axial direction of the on-off valve 30 .

[0028] The first joint 10 , the second join...

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Abstract

The invention provides a self-balanced underground full-bore check valve which comprises a first connector (10), a second connector (20), a switch valve (30) and a sliding sleeve (40), wherein the switch valve (30) comprises a valve seat (31) and a valve sheet (32); a first seal cavity (211) communicated with a space in a pipe and a second seal cavity (212) communicated with a space outside the pipe are respectively defined by the sliding sleeve (40) together with the first connector (10), the second connector (20) and the switch valve (30); and the valve sheet (32) is provided with a first working state of closing a valve port when the external pressure of an operating pipe column is greater than the internal pressure of the operating pipe column and a second working state of opening the valve port when the internal pressure of the operating pipe column is greater than or equal to the external pressure of the operating pipe column. The self-balanced underground full-bore check valve provided by the invention can be automatically opened or closed in time according to the real-time change of the internal and external pressure difference of the pipe column, thereby preventing blowout accidents from happening, improving the production safety, shortening the operation time and lowering the operation cost.

Description

technical field [0001] The invention relates to the fields of well completion testing and downhole operation in oil and gas fields, and in particular relates to a self-balancing downhole full-bore check valve. Background technique [0002] At present, in well completion testing and downhole operations at home and abroad, it is often encountered that the liquid in the pipe string overflows due to the formation pressure being greater than the internal pressure of the pipe string, which may lead to blowout in severe cases; Sometimes, due to the suction effect, the internal and external pressure of the pipe string may be unbalanced and accidents may occur, etc. These situations seriously endanger the safety of underground construction operations. At present, well killing and shutting in are commonly used to avoid such accidents. [0003] However, there are many disadvantages in eliminating well control risks by shutting in and killing wells: first, the pressure change in the we...

Claims

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Application Information

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IPC IPC(8): E21B34/08
Inventor 不公告发明人
Owner HUNAN GANGTUO ENERGY TECH
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