Small-diameter well cementing packer

A small-diameter, packer technology, which is applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., can solve problems affecting later production, leakage and blockage of screen pipes, etc., to reduce the probability of cement leakage, Strong sealing ability and small size effect

Pending Publication Date: 2019-10-11
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional sidetracking wells or small-diameter horizontal wells are limited by the empirical size of cementing at the top of the screen, so cement umbrellas can only be used as a tool to isolate the screen section. The screen section is completely isolated, and it is very easy for leakage to block the screen, which will affect the later production

Method used

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  • Small-diameter well cementing packer

Examples

Experimental program
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Effect test

Embodiment 1

[0017] combined with figure 1 , this embodiment mainly consists of an upper joint 1, a seal 2, a liquid inlet sealing ring 3, a central tube 4, an opening ring 5, a pin 6, an upper fixing sleeve 7, a rubber tube 8, a lower fixing sleeve 9, and a locking ring 10 Composition, a liquid inlet hole 11 is opened on the central tube 4, and a tool cavity 12 (equivalent to a diversion groove or a diversion channel) is formed between the central tube 4 and the rubber cartridge 8.

[0018] Among them: the upper joint 1 is threaded, which mainly serves the function of connecting the upper tool. The upper joint 1 and the central pipe 4 are fixed by the pin 6 before (it can also be fixed by threading the top of the central pipe), and the connection between the upper joint 1 and the central pipe 4 The gap is sealed by the seal 2, the upper part of the center pipe 4 has a radial liquid inlet hole 11, the liquid inlet seal ring 3 is located on the liquid inlet hole 11 of the center pipe 4, and...

Embodiment 2

[0025] Refer to attached figure 1 , a small-diameter cementing packer, including a pipe string composed of an upper joint 1 and a central pipe 4, and an upper fixed sleeve 7, a rubber sleeve 8, a lower fixed sleeve 9, and a locking ring arranged on the outer wall of the pipe string 10, wherein: after the upper joint 1 is sealed and connected to the top of the central pipe 4, the lower part of the upper joint 1 and the upper part of the central pipe 4 form an annular cavity; the upper part of the upper fixing sleeve 7 and the lower end of the upper joint 1 and the central pipe 4 pass through The pin 6 is fixedly connected, and the lower fixing sleeve 9 is axially locked and positioned by the locking ring 10 threadedly connected with the lower part of the central tube. Clamped outside the central tube 4; a radial through hole is provided on the central tube 4 in the upper section of the annular cavity, and the radial through hole is provided with a one-way valve (replacing the l...

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Abstract

The invention relates to a packer for implementing cementing operation on the top of a sieve tube. The packer comprises a tubular column formed by connecting an upper joint with a central pipe, an upper fixing sleeve, a rubber cylinder, a lower fixing sleeve and a locking ring, wherein the upper fixing sleeve, the rubber cylinder, the lower fixing sleeve and the locking ring are arranged on the outer wall of the tubular column; the upper joint is hermetically connected with the top of the central pipe to form an annular cavity; the upper portion of the upper fixing sleeve is fixedly connectedwith the lower end of the upper joint, the lower fixing sleeve is axially locked and positioned on the central pipe through the locking ring, and the rubber cylinder is clamped outside the central pipe through the upper fixing sleeve and the lower fixing sleeve; a radial through hole is formed in the central pipe, a liquid inlet sealing ring is arranged at the position of the radial through hole,an opening ring is fixed on the central pipe below the liquid inlet sealing ring through a shear nail, and a guide groove extending into the rubber cylinder is formed in the central pipe below the opening ring. The packer is simple in structure, high in reliability and small in size, can reduce the risk of cement leakage when sieve tube top cementing is carried out on side drilling and small-diameter horizontal wells, and achieves the purposes of packing the sieve tube section and protecting the sieve tube.

Description

technical field [0001] The invention relates to the field of well completion tools, in particular to an isolation tool for performing cement injection and cementing operations at the top of screen pipes. [0002] technical background [0003] Conventional sidetracking wells or small-diameter horizontal wells are limited by the empirical size of cementing at the top of the screen, so cement umbrellas can only be used as a tool to isolate the screen section. The screen section is completely isolated, and it is very easy for leakage to block the screen, which will affect the later production. Contents of the invention [0004] The purpose of the present invention is to solve the problems existing in the prior art, to provide a compact structure, small size, which can be applied to sidetracking wells or small-diameter horizontal wells, so that the screen section can be more effectively isolated, and the situation of cement leakage and blockage of the screen can be reduced. App...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/126
CPCE21B33/126
Inventor 董恩博冯德杰杨海波高原李国锋李伟赵勇张建国魏绪伟曹成章肖经纬邹晓敏李光洪马德材陶剑邵茹
Owner 中石化石油工程技术服务有限公司
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