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Expansion sleeve joint capable of improving liquid sealing performance

A technology of expanding casing and liquid sealing, which is applied in the direction of casing, drilling pipe, drilling equipment, etc., and can solve the problems of poor sealing performance and so on

Pending Publication Date: 2020-07-07
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor sealing performance in the prior art, the present invention provides an expansion casing joint with improved liquid sealing performance. The combination of the improved API round thread provides an expansion sleeve joint suitable for expanding the diameter of the expansion sleeve. The expansion sleeve joint has high strength, good sealing performance, and is easy to process

Method used

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  • Expansion sleeve joint capable of improving liquid sealing performance
  • Expansion sleeve joint capable of improving liquid sealing performance
  • Expansion sleeve joint capable of improving liquid sealing performance

Examples

Experimental program
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Effect test

Embodiment

[0046] Taking a joint structure suitable for an expansion sleeve as an example, the present invention will be further described in detail.

[0047] Refer to figure 2 , The joint structure suitable for expansion sleeve is mainly composed of male threaded joint 1 and female threaded joint 2.

[0048] Refer to image 3 , The male threaded joint 1 of the expansion sleeve includes a negative angle torque shoulder 6, an API round thread 5, a sealing groove 7 and a barbed thread 4 from the outside.

[0049] Refer to figure 2 , The negative angle torque shoulder 6 of the male threaded joint 1 and the negative angle torque shoulder 6 of the inner end of the female threaded joint 2 are matched, and they are in interference contact when the diameter is expanded, which serves as the first auxiliary sealing function.

[0050] Refer to figure 2 with Image 6 , The improved API round thread 5 of the male threaded joint 1 is matched with the improved API round thread 5 of the female threaded joint ...

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Abstract

The invention discloses an expansion sleeve joint capable of improving the liquid sealing performance. The expansion sleeve joint comprises a male threaded joint and a female threaded joint, the malethreaded joint is sequentially provided with a first negative-angle torque shoulder, first API round threads and first barb-shaped threads from the end to the outside, the female threaded joint is sequentially provided with a second negative-angle torque shoulder, second API round threads and second barb-shaped threads from the inside to the end, wherein the second negative-angle torque shoulder,the second API round threads and the second barb-shaped threads are matched with the male threaded joint; and a sealing structure is arranged between each first API round thread and each first barb-shaped thread. The joint is suitable for the joint structure of an expansion sleeve, the combination of the barb-shaped threads with high connectivity and the improved API round threads with good sealing performance is adopted, the expansion sleeve joint suitable for expanding is provided for the expansion sleeve, and the expansion sleeve joint is high in strength, good in sealing performance and easy to machine.

Description

Technical field [0001] The invention belongs to the field of oil and gas exploration and development, and specifically relates to an expansion casing joint for improving liquid sealing performance. Background technique [0002] In the process of oil and gas exploration and development, there are a large number of deep wells, ultra-deep wells and special wells with complex formations, and the level of casing running increases with the increase of well depth, resulting in the continuous reduction of borehole diameter and insufficient space for subsequent operations , And ultimately unable to achieve the expected target level economically. In order to overcome this problem, expandable casing technology emerged. Expansion casing technology is a technology that uses an expansion cone to expand its diameter to meet the engineering requirements by cold-extrusion downhole, with the ultimate goal of achieving a single well diameter. This technology can increase the depth of the drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08
CPCE21B17/08
Inventor 张建兵罗楚鞠录岩
Owner XI'AN PETROLEUM UNIVERSITY
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