Pressure-balancing one-way valve for coiled-tubing layering fracturing

A layered fracturing and one-way valve technology, which is applied in the direction of wellbore/well valve device, wellbore/well components, sealing/isolation, etc., can solve the problem of unfavorable fracturing and acidification transformation, the passage inside the pipe cannot pass outside the pipe Simultaneously carry out sealing and other issues to achieve the effect of facilitating sandblasting and perforating and reverse circulation sand flushing to remove plugging, improving the effect of sealing and setting, and simple structure

Active Publication Date: 2013-02-13
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

However, there is no pressure balance check valve used with the packer in the prior art, so that the inner passages above and below the packer cannot be isolated simultaneously with the outer passages, which is not conducive to layer-by-layer fracturing and acidizing reconstruction
After retrieval, there are currently no related technical publications applicable to pressure balance check valves for coiled tubing layered fracturing in domestic and foreign journals, magazines or patent databases.

Method used

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  • Pressure-balancing one-way valve for coiled-tubing layering fracturing

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The structure and connection relationship of the present invention: the present invention is mainly composed of an upper joint 1, a retaining ring 2, a sealing ball 3, a limit connection sleeve 4, a body 5, a sealing head 6, a lower joint 7, and a sealing packing group 8. The present invention is connected in the following order from top to bottom: upper joint 1, retaining ring 2, sealing ball 3, limit connecting sleeve 4, body 5, sealing head 6, lower joint 7, sealing packing group 8; the upper joint 1. The upper end is a threaded buckle, which is used to connect the upper pipe string. There is a one-way valve structure formed by the sealing ball 3 and the retaining ring 2 in the center, and the lower end is connected to the sealing head 6; the limit connecting sleeve 4 is used to limit the upper joint 1 and the The sliding range of the sealing head 6; the main body 5 is connected under the limit connecting sleeve 4; the lower joint 7 is connected under the main body 5,...

Embodiment 2

[0030] Main application of the present invention: During the construction process, the device of the present invention has the following important functions: the pressure balance check valve for layered fracturing of the coiled tubing can be used to set the pressure balance check valve when the string is lowered to set the packer. Insert the sealing head 6 in the valve into the lower joint 7, so that the inside of the packer pipe is sealed, and the inner and outer passages of the upper and lower pipes of the packer are sealed off. When the packer needs to be unsealed, the pressure is balanced in one direction by lifting the pipe string The sealing head 6 in the valve is pulled out from the lower joint 7, so that the upper and lower pressures of the packer are balanced to facilitate unsealing.

[0031] The upper end of the upper joint 1 of the pressure balance check valve is connected to a sand blaster. When the sand blaster needs to perform sandblasting and perforation, the ret...

Embodiment 3

[0033] The best embodiment of the present invention is, with reference to the attached figure 1 , the present invention includes an upper joint, a limit connection sleeve, a body, a sealing head and a lower joint sequentially connected from top to bottom. There are a retaining ring and a sealing ball, the sealing ball is installed at the reduced diameter, the retaining ring is installed above the sealing ball, the lower end of the upper joint is fixedly connected to the sealing head and the sealing head is covered on the upper joint, and the limit connecting sleeve is placed on the On the above joint, the main body is set on the limit connection sleeve and the sealing head, the body is fixedly connected with the limit connection sleeve, there is a sliding gap between the sealing head and the limit connection sleeve, and the lower joint extends into the body The lower end is fixedly connected with the body. A sealing packing is also included, and the sealing packing is arrange...

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Abstract

The invention discloses a pressure-balancing one-way valve for coiled-tubing layering fracturing. The pressure-balancing one-way valve comprises an upper joint, a limiting connecting sleeve, a body, a sealing head and a lower joint which are successively connected, wherein the inner part of the upper joint is of a hole-shrinkage cavity structure, a check ring and a sealing ball are mounted in a cavity in the upper part of the upper joint, the sealing ball is mounted at a hole shrinkage part, the check ring is mounted above the sealing ball, the lower end of the upper joint is fixedly connected with the sealing head and the sealing head is sleeved on the upper joint, the limiting connecting sleeve is sleeved on the upper joint, the body is sleeved on the limiting connecting sleeve and the sealing head and fixedly connected with the limiting connecting sleeve, a sliding gap is formed between the sealing head and the limiting connecting sleeve, and the lower joint stretches into the lower end of the body and is fixedly connected with the body. The pressure-balancing one-way valve for coiled-tubing layering fracturing has the characteristic of simple structure; and due to the adoption of the pressure-balancing one-way valve for coiled-tubing layering fracturing, the effects of packing and setting of an annular mechanical packer can be effectively improved, the setting and the packing are facilitated, and the abrasive perforating and the reverse-circulation sand-washing deblocking of a sand blower are facilitated.

Description

[0001] technical field [0002] The invention relates to the technical field of downhole tools for oil and gas wells for petroleum development, in particular to a pressure balance check valve for layered fracturing of coiled tubing, the pressure balance check valve is mainly used for downhole fracturing and acidizing construction. Background technique [0003] Most oil and gas reservoirs in China have multiple production layers in the vertical direction, and most of them are thin interbeds, and some even have more than 5 layers. The implementation of fracturing and acidizing is an important transformation measure to realize the production increase of oil and gas wells. For wells completed with casing, the more advanced technology at this stage is the construction method of coiled tubing running down the well multiple times to locate and isolate different layers. Empty packers are used to facilitate layer-by-layer acid fracturing after layer-by-layer sandblasting and per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/12E21B21/10
Inventor 张毅超张道鹏潘勇钟兴久李斌伍军
Owner BC P INC CHINA NAT PETROLEUM CORP
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