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Casing scraper

A scraper and casing technology, which is applied in the direction of cleaning equipment, wellbore/well parts, earthwork drilling, etc., can solve the problems of poor versatility, falling off, and incomplete scraping of spring-type scrapers, so as to speed up the operation progress and avoid Shedding, good effect

Inactive Publication Date: 2017-09-26
YANCHENG DONGRONG PETROLEUM MACHINERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention aims at the shortcomings existing in the prior art. The present invention provides a casing scraper, which overcomes the deficiencies of the prior art above, and can effectively solve the problems of poor versatility and incomplete scraping of the spring type scraper. Besides that, avoid the scraper falling off during use

Method used

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the following in conjunction with the attached figure 1 , 2 , 3, 4, and Examples, the present invention is described in further detail. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] as attached figure 1 and 2 As shown, the spiral sleeve scraper includes an upper joint 1, a body 2, a scraper and a lower joint 3; the inner middle part of the upper joint 1 is fixedly connected with the outer upper end of the body 2; the inner middle part of the lower joint 3 is connected with the body The outer lower ends of 2 are fixedly connected together; the body 2 between the upper joint 1 and the lower joint 3 is fitted with a scraper tube capable of radial contraction, and there are scraper teeth 4 on the scraper tube. The inner wall of the casing is scraped by the scr...

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Abstract

The invention discloses a casing scraper. The casing scraper is characterized in that the middle of the inner side of an upper connector is fixedly connected with the upper end of the outer side of a body; the middle of the inner side of a lower connector is fixedly connected with the lower end of the outer side of the body; a radially retractable scraping pipe sleeves the body and is positioned between the upper connector and the lower connector, and scraping teeth are arranged on the scraping pipe; the scraping pipe comprises an upper connecting head, a lower connecting head and at least two elastic scraping sheets; the axially retractable elastic scraping sheets which are circumferentially distributed are arranged between the upper connecting head and the lower connecting head in a fixedly connected manner, and each elastic scraping sheet is in the shape of an arch with a high middle and two low sides. The casing scraper has the advantages that the casing scraper comprises a drop-proof connector, the upper portion of the casing scraper is mounted on the lower portion of the lower connector in a threaded manner when the casing scraper is used, a first lower connector with the casing scraper can idle when strings reversely rotate in repeated scraping and string tripping procedures, threaded connection between the first lower connector and the casing scraper can be prevented from being loosened, the casing scraper can be prevented from dropping in service procedures, and the problem of downhole accidents due to the fact that existing scrapers are released and fall into wells can be solved.

Description

technical field [0001] The invention relates to the technical field of casing scrapers, and relates to a casing scraper. Background technique [0002] After cementing and removing ash plugs in oil and gas wells, there is usually cement residue on the inner wall of the casing of the ash plug section, which makes the inner wall of the casing in this section not smooth and regular, which will adversely affect the subsequent completion operations; When performing staged fracturing, it is also necessary to scrape and clean the inner wall of the operating casing section, which requires the use of a casing scraper. Common casing scrapers include rubber cylinder scrapers and spring scrapers. Conventional spring scrapers Scrapers generally use several spring-supported scrapers to scrape the inner wall of the casing, but the outer diameter of the scrapers of the same type of spring scraper is fixed, no matter how the spring is compressed, this type of scraper Only the inner diameter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/02
CPCE21B37/02
Inventor 王玉刚
Owner YANCHENG DONGRONG PETROLEUM MACHINERY CO LTD
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