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Well repairing tubular column assembly and diameter reducing cleaner thereof

A technology of scale remover and well casing, which is applied in the direction of wellbore/well components, cleaning equipment, earthwork drilling and mining, etc., and can solve the problems such as inability to remove foreign matter

Active Publication Date: 2020-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a variable diameter descaling device to solve the problem that the existing descaling device cannot remove the foreign matter on the inner wall of the shaft below the reduced diameter part. Another object of the present invention is to provide a descaling device The well string assembly is used to solve the problem that the existing workover string assembly cannot remove the foreign matter on the inner wall of the wellbore below the reduced diameter part

Method used

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  • Well repairing tubular column assembly and diameter reducing cleaner thereof
  • Well repairing tubular column assembly and diameter reducing cleaner thereof
  • Well repairing tubular column assembly and diameter reducing cleaner thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0080] The workover string assembly of this application is applicable to both reduced diameter wellbore and non-reduced diameter wellbore. Specific embodiment 1 of the workover string assembly of this application: The workover string assembly includes a well entry casing (not shown in the figure) and variable diameter descaler, such as figure 1 As shown, the variable diameter descaler includes an upper casing, a lower casing 4 and a hollow pipe 14 connected between the upper casing and the lower casing 4, the upper casing includes an upper joint 1 and an upper casing main body 3, and the upper casing includes an upper joint 1 and an upper casing main body 3. The upper part of the joint 1 is provided with a female thread for connecting with the well entry casing, and the female thread constitutes a connection structure. The lower part of the upper joint 1 is provided with a male thread for connecting with the upper housing main body 3, and the upper part of the upper housing ma...

specific Embodiment 2

[0090] The specific embodiment 2 of the workover string assembly of the present application, the difference between this embodiment and the specific embodiment 1 is that: no return spring is provided, slopes are provided at the upper and lower ends of the scraping part, and when passing through the reduced diameter section of the wellbore , the reduced-diameter section squeezes the slope to push the scraper to move inward, so that the variable-diameter descaler can pass through the reduced-diameter section of the wellbore smoothly.

specific Embodiment 3

[0091] The specific embodiment 3 of the workover string assembly of the present application, the difference between this embodiment and the specific embodiment 1 is that no baffle is provided, the return spring is arranged in the insertion slot, and the outer end of the return spring is pressed against the insertion slot. On the groove wall of the groove, the inner end of the return spring bears against the insertion part of the scraper.

[0092] The specific embodiment 4 of the workover string assembly of the present application differs from the specific embodiment 1 in that no spring receiving groove is provided on the scraper, and the return spring is provided in the space between the scraper and the baffle.

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Abstract

The invention relates to a well repairing tubular column assembly and a diameter reducing cleaner thereof. The diameter reducing cleaner comprises an upper shell, a lower shell and a hollow pipe. Theupper shell is provided with a connecting structure for being connected with a working sleeve. The lower shell is provided with a window, and a scraper capable of swinging outwards is arranged in thewindow. A rotating stopping matched structure is arranged between the upper shell and the lower shell, and the upper shell and the lower shell can be close to each other or away from each other. The hollow pipe is connected between the upper shell and the lower shell, and a shear pin and a limiting matched structure are arranged between the hollow pipe and the upper shell. A driving spring is arranged between the hollow pipe and the lower shell, the lower shell is blocked by the upper shell in the axial direction, and the lower shell is prevented from being separated from the hollow pipe upwards. When the hollow pipe moves downwards relative to the lower shell, the scraper is pushed to swing outwards. According to the diameter reducing cleaner, the inner wall of a shaft below a diameter reducing portion can be scraped through the diameter reducing portion, and the success rate of tripping in a selective mining and injection downhole tool is increased.

Description

technical field [0001] The invention relates to a workover pipe string assembly and a variable-diameter descaling device. Background technique [0002] Scraping cement blocks, cement rings, hard wax, various salt crystals and sediments, perforation burrs, and iron oxide produced after wellbore corrosion on the inner wall of the wellbore is essential for workover operations and normal downhole operations. An important process, the purpose of which is to improve the success rate of tool running and operation (such as the success rate of packer setting, etc.), especially when the annular space between the running tool and the inner wall of the wellbore is small, it should be fully scraped After that, the next step of construction is carried out so that various tools for going into the well can be unimpeded. [0003] With the increasing years of oilfield development, the downhole wellbore will inevitably be deformed and damaged. Due to the limitation of deformation shrinkage or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/02
CPCE21B37/02
Inventor 郭亮闫铎贾正旭张春贵赵文娇王帝文杨吉胜杨新前刘剑叶敏赵杰
Owner CHINA PETROLEUM & CHEM CORP