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Well workover string assembly and its reducing scale remover

A technology of scale remover and well casing, which is used in wellbore/well components, cleaning appliances, earth-moving drilling and other directions, and can solve the problem of inability to remove foreign matter.

Active Publication Date: 2022-07-19
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 workover string assembly and its reducing scale remover
  • Well workover string assembly and its reducing scale remover
  • Well workover string assembly and its reducing scale remover

Examples

Experimental program
Comparison scheme
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specific Embodiment 1

[0080] The workover string assembly of the present application is suitable for a reduced diameter wellbore and a non-reduced diameter wellbore. Specific Example 1 of the workover string assembly of the present application: the workover string assembly includes a well entry casing (not shown in the figure) and a variable diameter descaler, such as figure 1 As shown, the variable diameter descaling device includes an upper casing, a lower casing 4 and a hollow tube 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. 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 casing main body 3, the upper part of the upper casing main body 3 is provided with a female thread for matching with the ma...

specific Embodiment 2

[0090] In 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 a return spring is not provided, and slopes are provided on the upper and lower ends of the scraping portion, 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 scale remover can smoothly pass through the reduced-diameter section of the wellbore.

specific Embodiment 3

[0091] In 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 a baffle is not provided, the return spring is arranged in the insertion slot, and the outer end of the return spring abuts against the insertion On the groove wall of the groove, the inner end of the return spring abuts against the inserting part of the scraper.

[0092] The specific embodiment 4 of the workover string assembly of the present application is different from the specific embodiment 1 in that the scraper is not provided with a spring accommodating groove, and the return spring is provided in the interval between the scraper and the baffle.

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Abstract

The present invention relates to a well workover pipe string assembly and its variable diameter descaling device. The variable-diameter descaling device includes an upper casing, a lower casing and a hollow tube; the upper casing is provided with a connection structure for connecting the casing into the well; the lower casing is provided with a window, and a scraper that can swing outward is arranged in the window; The casing and the lower casing are provided with an anti-rotation matching structure and can be approached or separated from each other; the hollow tube is connected between the upper casing and the lower casing, and is provided with a shear nail and a limit matching structure between the upper casing and the upper casing. , There is a driving spring between the hollow tube and the lower shell, and the upper shell stops the lower shell in the axial direction to prevent the lower shell from breaking away from the hollow tube upward; the hollow tube pushes downward relative to the lower shell The scraper swings out. The variable-diameter scale remover of the invention can scrape the inner wall of the wellbore below the diameter-reduced part through the diameter-reduced part, thereby improving the success rate of running downhole tools for separate production and separate injection.

Description

technical field [0001] The present invention relates to a well workover pipe string assembly and its variable diameter descaling device. Background technique [0002] Scraping off the cement blocks, cement sheaths, hard wax, various salt crystals and sediments, perforation burrs and iron oxides generated after the wellbore corrodes remaining on the inner wall of the wellbore. An important process, the purpose of which is to improve the success rate of running the tool and the success rate of operation (such as the success rate of setting the packer, 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, proceed to the next step of construction, so that all kinds of downhole tools can be entered unimpeded. [0003] With the increase of oilfield development years, the downhole wellbore will inevitably be deformed and damaged. Due to the limitation of deformation reduction or subsid...

Claims

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Application Information

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Patent Type & Authority Patents(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