Check valve for downhole double-layer coiled tubings

A single-flow valve and tubing technology, which is used in wellbore/well valve devices, wellbore/well components, and earth-moving drilling and production, etc., can solve the problems of double-layer coiled tubing body damage and fracture, etc.

Pending Publication Date: 2020-10-27
邵玉刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the double-layer coiled tubing is operated with tools, it will encounter problems such as damage and fracture of the double-layer coiled tubing body caused by sudden accidents. blowout accident

Method used

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  • Check valve for downhole double-layer coiled tubings
  • Check valve for downhole double-layer coiled tubings
  • Check valve for downhole double-layer coiled tubings

Examples

Experimental program
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Embodiment Construction

[0021] see Figure 1-6 As shown, a check valve for downhole double-layer coiled tubing is arranged between the double-layer coiled tubing and the right end communicates with the bottom of the well, and includes a left valve body 1. The first left threaded hole 11 connected with the oil pipe, and the second left threaded hole 12 connected with the inner coiled tubing, the left valve body 1 is provided with the second left through hole 13 communicating with the first left threaded hole 11 and the second left threaded hole 13 connected with the left second threaded hole. The left one through hole 14 that hole 12 communicates; The right end of described left valve body 1 is fixedly installed with right valve body 2, and the right end of described right valve body 2 is provided with right one threaded hole 21 that is connected with outer layer coiled tubing, and with The second right threaded hole 22 connected to the inner coiled tubing, the right valve body 2 is provided with a ri...

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PUM

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Abstract

The invention discloses a check valve for downhole double-layer coiled tubings. The check valve is arranged between the downhole double-layer coiled tubings; the right end of the check valve communicates with the shaft bottom; the check valve comprises a left valve body; a left first threaded hole connected with the coiled tubing on the outer layer and a left second threaded hole connected with the coiled tubing on the inner layer are formed in the left end of the left valve body; a left second through hole communicating with the left first threaded hole and a left first through hole communicating with the left second threaded hole are formed in the left valve body; a right valve body is fixedly mounted at the right end of the left valve body; a right first threaded hole connected with thecoiled tubing on the outer layer and a right second threaded hole communicating with the coiled tubing on the inner layer are formed in the right end of the right valve body; a right second through hole communicating with the right first threaded hole and a right first through hole communicating with the right second threaded hole are formed in the right valve body; and a shuttle valve component,an inner-layer check valve component and an outer-layer check valve component are arranged in the left valve body. The check valve can effectively seal a passage of the coiled tubings on the inner and outer layers in the case of an unexpected situation to prevent well liquid from reversing out so as to prevent a gas blowout accident.

Description

technical field [0001] The invention relates to the technical field of downhole tools for petroleum production, in particular to a check valve for downhole double-layer coiled tubing. Background technique [0002] When the double-layer coiled tubing is operated with tools, it will encounter problems such as damage and fracture of the double-layer coiled tubing body caused by sudden accidents. gushes out and causes a blowout accident. Therefore, it is necessary to install a check valve for double-layer coiled tubing that can effectively close the passages of the inner and outer coiled tubing and prevent blowout when an accident occurs. Contents of the invention [0003] The object of the present invention is to provide a double-layer coiled tubing single-flow valve that can effectively seal the passages of the inner and outer coiled tubing when an accident occurs, thereby preventing the well fluid from returning and preventing blowout accidents. [0004] To achieve the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/08
CPCE21B34/08
Inventor 吴虹许长鑫亓丽红
Owner 邵玉刚
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