Cam type rock debris cleaning tool

Abstract

The invention relates to a cam type rock debris cleaning tool, and belongs to the technical field of horizontal well rock debris cleaning equipment. An upper connector is installed at one end of a shell body in a threaded mode, a lower connector is installed at the other end of the shell body in a threaded mode, a center hole is eccentrically formed in the shell body in the axial direction, and an eccentric shaft is movably installed in the center hole through an upper bearing piece and a lower bearing piece; and assembling grooves are symmetrically formed in the circumference, corresponding to the eccentric shaft between the upper bearing piece and the lower bearing piece, of the shell body, and cleaning mechanisms are installed in the assembling grooves, and are in contact connection with the eccentric shaft. A spoiler of the tool has a directional rock debris cleaning function, when the spoiler rotates to the bottom of an annulus, the spoiler automatically stretches out to clean a rock debris bed, so that rock debris at the bottom of the annulus is scraped to a high-speed area on the upper portion of the annulus by the device, moreover, when the device rotates to the high-speed area on the upper portion of the annulus, the spoiler automatically retracts to prevent the rock debris in the high-speed area on the upper portion of the annulus from being scraped to the bottom of the annulus, and meanwhile, the spoiler does not have a balling phenomenon, so that the drilling efficiency and economic benefits are effectively improved.

Description

technical field [0001] The invention relates to a cam-type cuttings cleaning tool, which belongs to the technical field of cuttings cleaning equipment for horizontal wells. Background technique [0002] During the drilling process of horizontal wells, because there is an angle or even vertical between the gravity direction of cuttings and the direction of drilling fluid pushing force, the component of gravity in the vertical direction of medium flow makes the cuttings move down the well wall, and at the same time, the drilling of this well section The tool lies on the lower wellbore wall, coupled with the large outer diameter of the drill string joint, the small area of ​​the outer annulus, and the blocking of cuttings by the slope of the joint, the cuttings particles produced by drilling will be deposited in the low-velocity zone at the lower part of the annulus wellbore. Cuttings beds are easily formed after the drilling fluid migrates for a period of time. [0003] At pr...

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Problems solved by technology

[0003] At present, people mainly improve the suspension capacity of cuttings in the horizontal well section, adjust the rheology of drilling fluid, and clean the wellbore by short tripping to remove cuttings beds to prevent the formation of cuttings beds. If the cuttings bed cannot be removed efficiently, the height of the cuttings bed will continue to increase, which will eventually lead to downhole accidents such as drill pipe being buried, cuttings difficult to move, drill pipe torque increasing, and drill sticking. At the same time, if traditional cuttings cleaning tools are used, During the cleaning process of the cuttings bed, the tool is prone to form bagging phenomenon, which seriously affects the efficiency and economic benefits of drilling, so it is necessary to improve it

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