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Self-expansion packer

A self-expanding and packer technology, which is applied in the field of oil drilling and well completion operations, can solve problems such as inability to effectively prevent rubber extrusion and tearing, unsatisfactory sealing ability, and affecting sealing ability, and achieve pressure maintenance Solidity, compact structure, easy to enter the well

Active Publication Date: 2013-07-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the structure is relatively simple, the end ring cannot touch the well wall after setting, and the rubber may still be extruded and plugged, which will affect the sealing ability
[0006] Therefore, the self-expanding packers in the prior art cannot effectively prevent the rubber from being extruded and torn, and their sealing ability is not satisfactory

Method used

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Examples

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Embodiment Construction

[0023] The present invention will be described in detail below based on the accompanying drawings.

[0024] Such as figure 1 As shown, a self-expandable packer 10 according to the present invention includes a base pipe 1 . The base pipe 1 can be in the form of API casing or tubing, for example, and its upper and lower ends are threaded so as to be connected with the upper and lower completion strings.

[0025] A self-expanding rubber sleeve 6 is arranged around the base pipe 1 . The rubber cartridge 6 can be vulcanized on the base pipe 1 by winding or molding, for example. The material and length of the rubber cartridge 6 can be customized according to specific well conditions. When the packer 10 is lowered to a predetermined position at the bottom of the well along with the well completion string and contacts liquid such as crude oil or water, the rubber sleeve 6 will absorb the oil or water and expand.

[0026] The packer 10 also includes a limiting end ring 2 , which is...

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Abstract

The invention provides a self-expansion packer which comprises a base tube, a self-expansion rubber cylinder, limit end rings and bulge-preventing rings, wherein the base tube is surrounded by the self-expansion rubber cylinder; the limit end rings are fixed on the base tube and are close to two ends of the rubber cylinder; two ends of the rubber cylinder are surrounded by the bulge-preventing rings; each bulge-preventing ring comprises a base ring part and a plurality of batten parts which extend from the base ring part in the longitudinal direction of the base tube; and every strip part on the periphery of the base tube is partially overlapped with a part of an adjacent strip part. By the aid of the bulge-preventing rings, the rubber cylinder can be prevented from being extruded and torn. At the same time, the rubber cylinder can still absorb liquid in a well after seals of two ends of the rubber cylinder are expanded, so that the compactness to the well wall is maintained and reliable and stable annulus packing is achieved.

Description

technical field [0001] The invention relates to the technical field of oil drilling and well completion operations, in particular to a liquid self-expanding packer. Background technique [0002] As a downhole operation tool for layer isolation, packer is widely used in many technological measures including drilling, well completion and reservoir stimulation in oil exploration and development. The self-expanding packer is a self-expanding packer with no mechanical moving parts and no setting tools. It has the advantages of simplified construction process, high operation efficiency and strong adaptability, and is especially suitable for complex oil and gas wells. Completion operations. [0003] CN200920106033.9 discloses a self-expanding packer. The self-expanding packer utilizes the adsorption properties of the rubber that expands in contact with liquid (oil or water) to realize the swelling seal of the rubber sleeve, and realizes the axial limit of the rubber sleeve throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/127
Inventor 郭朝辉马兰荣刘阳杨德锴高原薛占峰
Owner CHINA PETROLEUM & CHEM CORP
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