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A blasting start sliding sleeve

A sliding sleeve and bursting disc technology, which is applied in the fields of mining fluid, wellbore/well components, and earthwork drilling and production, can solve the problems of difficult construction, long construction period, and high construction cost, so as to avoid perforating operations and improve The effect of construction efficiency and construction cost saving

Active Publication Date: 2018-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of long construction period, high construction cost and difficult construction in the first stage perforation and fracturing of the existing casing sliding sleeve, and to design a starting sliding sleeve to avoid perforation construction. , shorten the construction period, save construction costs, and reduce the difficulty and risk of the first-stage fracturing construction of the casing sliding sleeve

Method used

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  • A blasting start sliding sleeve

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Experimental program
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Effect test

Embodiment 1

[0019] This embodiment provides a blasting start sliding sleeve, such as figure 1 As shown, it includes an upper joint 1 and a lower joint 8 connected by threads. There are a plurality of vertical strip-shaped fracturing ports 3 evenly distributed on the pipe wall of the upper joint 1 along the circumferential direction. A piston 4 is installed inside the upper joint 1, and the piston 4 will press the The rupture port 3 is blocked; the upper pipe wall of the upper joint 1 is equipped with a bursting disc holder 2, and the bursting disc holder 2 passes through the pipe wall of the upper joint 1, and the bursting disc holder 2 is located inside the upper joint 1 A bursting disc 6 is installed at one end of the top joint 1, and the bursting disc 6 is in the shape of a disk with the same inner diameter as the upper joint 1, forming a spacer blocking the upper joint 1 in the upper joint 1, and the bursting disc 6 is located at the top of the piston 4.

[0020] In order to ensure a ...

Embodiment 2

[0023] On the basis of Embodiment 1, in this embodiment, the lower end of the piston 4 is located inside the lower joint 8 and the piston 4 and the lower joint 8 are installed in a clearance fit. A circlip groove 9 is provided, and the distance between the circlip 7 and the circlip groove 9 is greater than the distance between the upper end of the piston 4 and the lowermost end of the fracturing port 3 .

[0024] On the basis of the above-mentioned implementation process, when the piston 4 in this embodiment goes down to the bottom of the lower joint 8, the clip spring 7 located outside the lower part of the piston 4 just falls into the clip spring groove 9 at the lower part of the inner wall of the lower joint 8, and passes through the clip. The spring 7 locks the piston 4 in the circlip groove 9 in the lower joint 8 to prevent the piston 4 from going up to block the fracturing port 3 and ensure the smooth progress of the fracturing process.

Embodiment 3

[0026] On the basis of the above two embodiments, this embodiment is further improved and explained. In this embodiment, the piston 4 is placed in the upper joint 1 through clearance fit installation, and the piston 4 is fixed on the upper joint 1 by the shear pin 5. on the inner wall of connector 1.

[0027] Normally, the piston 4 is fixed on the inner wall of the upper joint 1 through the shear pin 5. When the blasting start-up sliding sleeve starts to work, the pipe string is used to pressurize the inside of the casing. When the pressure rises to the predetermined breakdown pressure of the bursting disc, the blasting The sheet is broken down to form a pressure channel, and the liquid pushes the piston 4 downward. Since the piston 4 is fixed on the inner wall of the upper joint 1 at this time, as the pressure rises, the shear force on the shear pin 5 continues to increase until the shear pin 5 When the cutting pin 5 is cut off, the piston 4 starts to descend to complete the ...

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Abstract

The invention belongs to the technical field of fracturing transformation of oil and gas wells, in particular to a blasting start-up sliding sleeve designed for multi-layer fracturing transformation of oil and gas wells, comprising an upper joint and a lower joint connected by threads, and the pipe wall of the upper joint is evenly spaced along the circumferential direction. There are multiple vertical strip-shaped fracturing ports, a piston is installed inside the upper joint, and the piston blocks the fracturing port; a bursting disc holder is installed on the upper pipe wall of the upper joint, and the bursting disc holder passes through On the pipe wall of the upper joint, the end of the bursting disc holder located inside the upper joint is equipped with a bursting disc. The bursting disc is in the shape of a disc with the same inner diameter as the upper joint, forming a spacer in the upper joint to block the upper joint. The bursting disc is located on the upper part of the piston. This kind of blasting starting sliding sleeve can realize the starting sliding sleeve of the first stage of fracturing during the multi-layer and multi-stage fracturing construction of the casing sliding sleeve, eliminating the perforation operation, improving the construction efficiency and saving construction. Reduce costs and reduce construction difficulties and risks.

Description

technical field [0001] The invention belongs to the technical field of fracturing transformation of oil and gas wells, in particular to a blasting start-up sliding sleeve designed for multilayer fracturing transformation of oil and gas wells. Background technique [0002] At present, in the multi-layer and multi-stage fracturing construction of limited-stage and infinite-stage casing sliding sleeves carried out in China, when the stratum is opened and the first stage fracturing is performed, perforation is often used for fracturing, which has the following disadvantages: [0003] 1. Long construction period; [0004] 2. High construction cost; [0005] 3. Perforating is very difficult during horizontal well construction. [0006] Therefore, there is an urgent need to design a start-up sliding sleeve to avoid perforation construction, shorten the construction period, save construction costs, and reduce the difficulty and risk of the first-stage fracturing construction of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26
Inventor 胡开斌张文星慕立俊张华光王治国薛晓伟张安康刘明
Owner PETROCHINA CO LTD
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