Integral mandrel ball putting opening type casing scraper
A pipe scraper and integral core technology, which is used in cleaning appliances, wellbore/well components, earth-moving drilling, etc. effect of risk
Pending Publication Date: 2020-12-04
PETROSTAR OIL TECH
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- Application Information
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Problems solved by technology
Due to the complex downhole environment, there may be foreign objects in the casing or changes in the inner diameter of the casing, which will affect the packer setting
Method used
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. Since the position of the product of the present invention can be changed at will, the location words such as "up", "down", "left" and "right" in the present invention only represent relative positional relationships, and are not used to limit absolute positions. location relationship. In the following description, although as figure 1 As shown, the sleeve pipe scraper of the present invention adopts an upside-down and vertically placed pictorial mode (the paper is viewed from right to left according to the figure number), the upper joint is located below the page, and the lower joint is located above the page, but in order to better match with Corresponding to the actual product, the upper and lower relationship shall pre...
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The invention discloses a casing scraper and a casing cleaning method adopting the same. The casing scraper comprises a housing, an integral mandrel, a ball seat and housing cutter blocks, wherein theball seat is fixed at one end of the integral mandrel through a ball seat pin, and the housing cutter blocks are usually contained in a slope groove in the outer surface of the housing; and at ordinary times, the ball seat is fixed to a first position of the housing, after a ball is put in to block a ball seat channel, fluid pressure pushes the ball seat to move downwards, when the ball seat moves to a second position, a slope toe structure of the integral mandrel pushes the housing cutter blocks to extend out of the outer surface of the housing and be fixed, and therefore the housing cutterblocks can conduct scraping on the inner wall of a casing. According to the casing scraper, the housing cutter blocks are opened by ball putting, the portion, at the preset depth, of the casing can besubjected to scraping, and the abrasion to the portions, at other positions, of the casing is reduced; in addition, complex structures such as a spring and a gasket of a conventional casing scraper are not needed; and the integral mandrel is not provided with a middle connecting buckle, so that the risk of middle connection failure of the scraper can be reduced.
Description
technical field [0001] The invention relates to a petroleum casing cleaning tool, in particular to a casing scraper and a casing cleaning method using the same. Background technique [0002] The casing scraper is used to remove cement blocks, hard wax, various salt crystals and deposits, burrs, rust, etc. remaining on the inner wall of the casing, so that various downhole tools can be smoothly run in the casing. Among them, especially when the annular space between the downhole tool and the inner wall of the casing is small, it should be fully scraped first, and then proceed to the next step. At present, in some domestic oil fields and some foreign oil and gas wells, the use of scrapers has become an indispensable process. The purpose is to improve the success rate of running downhole tools, such as improving the success rate of packer setting. Due to the complex downhole environment, there may be foreign objects in the casing or changes in the inner diameter of the casing,...
Claims
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Login to View More IPC IPC(8): E21B37/04
CPCE21B37/04
Inventor 蔡万伟徐希良李壮
Owner PETROSTAR OIL TECH