Drilling tool backing pressure prevention device for directional well

Abstract

The invention provides a drilling tool backing pressure prevention device for a directional well. The device comprises a core shaft, a core shaft sleeve and an impeller. The core shaft is a cavity with a through hole, and the core shaft is axially and movably sleeved with the core shaft sleeve; high-pressure mud flows through an inner cavity of the core shaft sleeve and flows through an inner cavity of the core shaft; a flow-cutting piston is arranged at the inlet end of the core shaft, and partial pressure of the high-pressure mud is transferred to the core shaft through the flow-cutting piston; and meanwhile, flowing smoothness of the high-pressure mud is ensured. The impeller is arranged in the core shaft, and a rotating shaft of the impeller is perpendicular to the axis direction of the core shaft; and the high-pressure mud drives the impeller to rotate. According to the drilling tool backing pressure prevention device for the directional well, the impeller and the flow-cutting piston are arranged in a circulation channel of the high-pressure mud, and the core shaft generates axial pulsed vibration; and friction between a drilling tool and the well wall is reduced, the backing pressure problem is solved, and the well drilling effect is improved.

Description

technical field [0001] The invention relates to the technical field of oil drilling equipment, in particular to a drilling tool anti-backup device for directional wells. Background technique [0002] With the advancement of oil drilling and exploitation, more and more directional wells and horizontal well technologies have been applied to oil drilling projects, and cluster wells are even used in some areas. Such a well design not only saves drilling costs, but also enables the drill bit to drill to the ideal target position better and more accurately, thereby improving the efficiency and output of oil extraction. However, the well structure of the above-mentioned various drillings also brings greater difficulties to the drilling work, which requires people to use new equipment and new technology to solve the well safety problems, orientation problems, drilling tool wear problems and drill bit back pressure And other issues. [0003] Among them, the problem of bit support p...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a drilling tool anti-back pressure device for directional wells to solve the problem of drill bit back pressure existing in the drilling tools in the prior art during the drilling of directional wells and horizontal wells

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