A device for cleaning mud on the outer wall of a drilling tool

Abstract

The invention discloses a device for removing slurry on the outer wall of a drilling rig. The device is composed of an outer supporting cylinder, a plurality of upper slurry scraping units and a plurality of lower slurry scraping units. The slurry scraping units are fixedly arranged in the outer supporting cylinder in two or more layers according to the combined use condition of the drilling rig in the drilling process, and thus the effect of full-dimension slurry scraping of a whole drilling column is achieved. The drilling rig transmits deformation stress to an outer cylinder through the slurry scraping units when being lifted. In the using process, force applied by the drilling rig makes the slurry scraping units to have elastic deformation, gaps appear between the slurry scraping units, and due to the fact that insertion openings for installing the slurry scraping units are staggered at the horizontal position, slurry on the whole periphery of the outer wall of the drilling rig can be effectively scraped away. The slurry scraping units are convenient to demount and mount, drilling fluid on the outer wall of the drilling rig can be disposed in time, the ambient of a drill floor is protected, manpower cost can be reduced, labor intensity can be relived, and safety can be ensured.

Description

technical field [0001] The invention relates to the fields of oil and gas drilling, geothermal drilling, hydrological water well drilling and other mud drilling, in particular to a mud cleaning device for the outer wall of a drilling tool. Background technique [0002] Drilling rig equipment, drilling tools and drilling fluid are the three necessary conditions for conventional drilling. The drilling rig provides power for the drilling tool and drilling fluid, the drilling fluid protects the drilling tool and the hole wall, and the drilling tool provides circulation channels for the drilling fluid. The three are harmonious and unified , are indispensable, forming the most widely used conventional mud drilling technology. However, when the drill is pulled out, the drilling tool is lifted out of the wellbore, and the outer wall of the drilling tool is covered with drilling fluid. After contacting with the air, it is easy to cause oxygen corrosion to the drilling tool, and at th...

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Problems solved by technology

Therefore, its practicality is greatly limited

[0004] The External pipe wiping apparatus and method of pulling and wiping a pipe string US19970999058 invented by Haggard Archie in the United States uses a cylinder to drive a crank-connected shaft mechanism to drive the elastic thin plate material to move radially and longitudinally, thereby scraping the surface of the drill pipe. The size of the diameter automatically adjusts the stretching distance and angle of the elastic thin plate material, which can be applied to different drill tool assemblies, but the structure of the device is complicated and the cost is high, and when the drill string with too large or too small diameter passes through the longitudinal direction, the elastic thin plate material cannot Ensure complete scraping of drilling fluid

Ma Zhi discloses a mud scraping ring and mud scraping device CN200510083130 for the outer wall of the drill pipe. The hollow elastic mud scraping ring inside the clamping device is used to scrape the drilling fluid on the outer wall of the drill pipe. Large, when the mud scraper ring passes through the large-diameter drill string, due to its good elastic energy, it quickly returns to the outer wall of the drill pipe, and the performance requirements for the selected material are relatively high, and the elastic material will expand in diameter as the working time increases. , has no substantial difference from the currently used rubber mud scrapers, both of which have the problems of large wear and fast consumption

The inventor once disclosed a kind of mud scraper on the outer wall of drilling tools, which can adapt to the passage of drilling tools of different sizes and specifications, and has a better mud scraping effect, but it cannot adapt to the working conditions of short-term lowering of drilling tools, and the installation process is more complicated and time-consuming

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