Sleeve outer wall polishing device

A casing and outer cylinder technology, which is applied in the field of casing outer wall grinding devices, can solve problems such as poor casing sealing, and achieve the effects of increasing safety and reducing the risk of being cut off.

Pending Publication Date: 2021-04-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of poor sealing after the tie-back of the existing casing, and provides a casing outer wall grinding device, which can effectively clean the casing outer wall

Method used

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  • Sleeve outer wall polishing device
  • Sleeve outer wall polishing device
  • Sleeve outer wall polishing device

Examples

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Embodiment Construction

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be further described below in conjunction with specific examples.

[0021] Such as figure 1 As shown, this embodiment provides a casing outer wall grinding device, which is in the shape of a cylinder as a whole, and at least includes an upper joint 1, a change button 2, an extension tube 3, a grinding section, and a guide shoe 9 from top to bottom, and sequentially Threaded connection is adopted; the upper end of the upper joint 1 is a female buckle; the lower part of the guide shoe 9 is in a spiral shape, which is convenient for being inserted into the pipe string during the rotation.

[0022] The variable buckle 2 is divided into upper, middle and lower sections as a whole, the upper section is smaller in size, the lower section is larger in size, and the middle section is used as a transition section between the ...

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PUM

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Abstract

The invention discloses a sleeve outer wall polishing device which is cylindrical as a whole. The device comprises an upper connector, an adapter, an extension cylinder, a polishing working section, and a guide shoe from top to bottom; a radial moving space is reserved in a scraper blade; the protruding portion of the scraper blade extends towards two ends to form a chamfer structure, so that the radial deformation of the scraper blade is facilitated, and jamming accidents can be avoided when the outer wall of a sleeve is polished; a clamping groove of a supporting ring adopts a dovetail groove design, and a pin hole formed in the clamping groove is oval, so that in the deformation process of the scraper blade, a pin can move by a certain distance along the pin hole; and force generated by deformation is borne through the clamping groove, so that the risk that the pin is sheared off is reduced, and the structural safety is improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a casing outer wall grinding device. Background technique [0002] During oilfield development, due to the existence of formation corrosion fluid, at the same time, in the process of drilling, completion and workover, the wear and tear on the casing of the drilling tool and the defects of the casing itself, the conduit or casing of the oil and gas well may be damaged. There will be the problem of perforation, which will directly affect the safety of oil and gas production. In order to maintain the continuity of oilfield production, the casing of the damaged section can be cut and salvaged, and then repaired by connecting a new casing. The external subsidy casing tie-back technology can maintain the original diameter of the casing, and has unique advantages in casing repair. In order to avoid the situation of poor sealing after tie-back, it is very importan...

Claims

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Application Information

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IPC IPC(8): E21B29/00E21B29/10
CPCE21B29/005E21B29/10
Inventor 黄毓祥李清涛陈鹏飞倪益民刘志伟王世强李志彬刘景超吴事难李文良
Owner CHINA NAT OFFSHORE OIL CORP
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