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Rupture starting sliding sleeve

A sliding sleeve and bursting disc technology, which is applied in the direction of mining fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of difficult construction, high construction cost, and long construction period, so as to avoid perforating operations, Improve construction efficiency and save construction cost

Active Publication Date: 2015-11-25
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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  • Rupture starting 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 oil and gas well fracturing reconstruction, and particularly discloses a rupture starting sliding sleeve designed for oil and gas well multi-strata-series fracturing reconstruction. The rupture starting sliding sleeve comprises an upper connector and a lower connector which are connected through threads. A plurality of vertical long-strip-shaped fracturing ports are evenly formed in the pipe wall of the upper connector in the circumferential direction. A piston is installed inside the upper connector, and the fracturing ports are plugged by the piston. A rupture disk clamper is installed at the upper portion of the pipe wall of the upper connector and penetrates through the pipe wall of the upper connector. A rupture disk is installed at the end, located inside the upper connector, of the rupture disk clamper and is in a disk shape with the inner diameter the same as that of the upper connector. A spacer for spacing the upper connector is formed in the upper connector. The rupture disk is located at the upper portion of the piston. By means of the rupture starting sliding sleeve, first-stage fracturing during sleeve sliding sleeve multi-layer and multi-section fracturing construction can be achieved, perforation operation is avoided, the construction efficiency is improved, the construction cost is saved, and the construction difficulty and the construction risks are reduced.

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 Applications(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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