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Dual-channel different-direction joint-control check valve

A dual-channel, single-flow valve technology, applied in wellbore/well valve devices, wellbore/well components, earthwork drilling and production, etc., can solve problems such as damage and fracture of double-layer coiled tubing

Active Publication Date: 2015-09-23
BC P INC CHINA NAT PETROLEUM CORP +1
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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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  • Dual-channel different-direction joint-control check valve
  • Dual-channel different-direction joint-control check valve
  • Dual-channel different-direction joint-control check valve

Examples

Experimental program
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specific Embodiment

[0044] Such as Figure 1 to Figure 4 As shown, the left valve body 2 has a cylindrical structure. The inner wall of one end is finished with a double-layer female port for connecting the inner and outer coiled tubing bodies, and the outer wall of the other end is finished with a male for connecting the right valve body 14. buckle. In the center of the left valve body 2, a cylindrical through hole with a diameter smaller than that of the inner threaded thread is drilled and milled, that is, the first left through hole 41, which is used for the injection and discharge of liquid in the inner coiled tubing. At a certain distance from the outer edge of the first left through hole 41, three oblong cross-sectional through holes with an angle of 120° are drilled and milled respectively, that is, the second left through hole 42 (the number in this embodiment is Three, two or four, etc.) are used for the injection and discharge of liquid in the outer coiled tubing.

[0045] Such as figure...

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Abstract

The invention discloses a dual-channel different-direction joint-control check valve which comprises a left valve body, a right valve body, an inner piston, an outer piston, an inner reset spring and an outer reset spring. A gap with the preset size is reserved between the hole wall of a first right through hole and the hole wall of a first left through hole, a plurality of inner grooves are evenly circumferentially arranged in the outer wall of the inner piston and correspond to the gap, a plurality of outer grooves are arranged in the inner wall of the outer piston in a manner of being in one-to-one correspondence to the inner grooves, the bottom of each outer groove is provided with one pin shaft reset spring, one pin shaft is jacked into the inner groove through the pin shaft reset spring, the hole wall of the first right through hole is provided with blind holes corresponding to the pins shafts, each blind hole is provided with one slider and a slider reset spring which press the slider onto the pin shaft, and the inner piston drives the outer piston to move synchronously through the pin shafts when moving rightwards under the pressure of the left side. By the arrangement, blowout accident can be effectively prevented when accident happens.

Description

Technical field [0001] The present invention relates to the field of oil drilling equipment, in particular to a dual-channel non-directional joint control single flow valve. 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. At this time, the oil, gas and water in the well will pass through the internal and external passages of the double-layer coiled tubing after the fracture. The blowout caused a blowout accident. Therefore, there is a need for a dual-channel non-directional combined control check valve. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a dual-channel different-directional combined control single-flow channel that can effectively seal the inner and outer coiled tubing when an accident occurs, thereby preventing the return of well fluid and preven...

Claims

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Application Information

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IPC IPC(8): E21B34/00
Inventor 任勇强张毅徐昊洋于丽敏刘玉海杨小涛提云王燕声刘雨薇徐克彬欧明军
Owner BC P INC CHINA NAT PETROLEUM CORP
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