Double-flow-channel direction control short connection device

A technology of directional control and dual channels, which is applied in earthwork drilling, wellbore/well components, flushing wellbore, etc., can solve problems such as ball valve spool wear, ball valve half-opening and half-closing, affecting sealing reliability, etc., to ensure Reliability, increase reliability, reduce stress agitation effect

Active Publication Date: 2015-04-29
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent US20100276143A1, a directional control shorting device used in downhole double-layer pipes is mentioned. This shorting device adopts a ball valve structure. The opening and closing of the ball valve is realized by the ball valve rotation mechanism. The structure is relatively complicated. Changes in fluid displacement may cause the ball valve to be half-opened and half-closed, resulting in wear of the ball valve spool and affecting the reliability of the seal

Method used

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Examples

Experimental program
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Embodiment 1

[0020] A double channel direction control shorting device includes an outer channel check valve 1 , a fluid turning short circuit 2 and an inner channel check valve 3 . The device is connected to the lower ends of the inner tube 4 and the outer tube 5 of the double-layer tube, the inner tube 4 forms an inner flow channel, and the inner tube 4 and the outer tube 5 form an outer flow channel.

[0021] Outer channel check valve 1 includes spool A11, outer sealing ring A12, inner sealing ring A13 and spring A14; spool A11 is installed between inner tube 4 and outer tube 5; The layer tubes 4 are sealed by the inner layer sealing ring A13; when the double-layer tube outer flow channel check valve 1 is closed, the valve core A11 and the outer layer tube 5 are sealed by the outer layer sealing ring A12; the valve core A11 Spring A14 is installed at the lower part; the inner tube 4 is radially processed with a through hole D6, and the valve core A11 is radially processed with a through...

Embodiment 2

[0027] In Embodiment 2, the fluid steering short-circuit is connected separately to the shell of the inner layer channel check valve (ie, the body 20 and the valve body 35 ).

Embodiment 3

[0028] In embodiment 3, the sealing ring in embodiment 1 is simplified or omitted, and the sliding and sealing cooperation between the upper and lower valve cores and their joint surfaces is achieved through fine processing.

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Abstract

The invention discloses a double-flow-channel direction control short connection device. The device is connected to the lower ends of an inner-layer pipe and an outer-layer pipe of a double-layer pipe. The device comprises an outer-layer flow channel one-way valve, a fluid steering short connector and an inner-layer flow channel one-way valve, wherein the outer-layer flow channel one-way valve comprises a valve core A, an outer-layer sealing ring A, an inner-layer sealing ring A and a spring A, and can be used for realizing direction control of fluid in an outer-layer flow channel; the fluid steering short connector can be used for realizing communication of an inner-layer flow channel with an annulus space; the inner-layer flow channel one-way valve comprises a valve core C, a valve seat C, a valve body C and a spring C, and can be used for realizing direction control of fluid in an inner-layer flow channel. By adopting the device, fluid entering the annulus space through the outer-layer flow channel can be guided into the inner-layer flow channel, and isolation of the inner-layer flow channel and the outer-layer flow channel from the shaft bottom fluid can be realized. The device has the advantages of simple structure, reliability in direction control and reduction of shaft bottom pressure fluctuation during pump opening.

Description

technical field [0001] The invention relates to a fluid direction control shorting device, in particular to a shorting device for controlling the fluid direction in a double flow channel of a double-layer pipe. Background technique [0002] With the continuous advancement of oil drilling technology, double-layer drill pipe low-pressure drilling technology, central sampling drilling technology and rewell drilling technology have gradually appeared. These technologies are all based on double-layer pipe (double-layer drill pipe) equipment. An inner layer flow channel is formed inside the inner layer tube of the double-layer tube, and an outer layer flow channel is formed between the inner layer tube and the outer layer tube. During the drilling process, especially when using double-tube-based rellwell drilling technology for circular drilling, it is required that the drilling fluid on the ground can pass through the outer flow channel and the drill bit water hole to reach the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/12
CPCE21B21/08E21B21/12
Inventor 燕修良陈永明王树江朱焕刚康波曹强苗智瑜孙宇
Owner CHINA PETROCHEMICAL CORP
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