Drilling tool for breaking rocks by producing compound action through rotary-percussion mode

Abstract

The invention relates to a drilling tool for breaking rocks by producing the compound action through a rotary-percussion mode. The drilling tool is fixedly installed on the upper portion of a drill bit and comprises a power end, a percussion shaft assembly and a lower tool assembly; the rear end of the percussion shaft is connected with the power end, and the front end of the percussion shaft is connected with the lower tool assembly; the power end enables a turbine to work under the slurry pressure and drives an upper shaft to rotate, the turning moment and the torque are transmitted to the percussion shaft through a square active connection, the percussion shaft impacts an anvil, and the impact force of the rotary-percussion mode action is applied to the drill bit. The mode of action of the novel drilling tool is the percussion action mode, the up and down reciprocating action of the percussion shaft is achieved by means of interaction of cam mechanisms, the novel drilling tool breaks the rocks in an oscillation and shearing mode, the contact time with the bottom layer can be shortened, the wearing degree of the drill bit can be reduced, the service life of the drill bit is prolonged, and meanwhile the borehole quality can be optimized.

Description

technical field [0001] The invention belongs to a rotary rock-breaking tool in the field of petroleum and natural gas drilling engineering, in particular to a drilling tool for rock-breaking by means of a composite effect produced by a rotary punching method. Background technique [0002] The new type of drilling tool with the function of rotary punching can apply an axial or circumferential impact force to the drill bit at the same time of rotating drilling to improve the rock breaking effect, and can be effectively applied to deep wells, ultra-deep wells and hard formations. When the drill bit encounters hard formations or alternate soft and hard formations during the drilling process, problems such as stick-slip and broken teeth often occur, which not only slows down the drilling speed, but also is not conducive to controlling the quality of the wellbore and is not conducive to the later stage Well cementing, well completion and other work. Therefore, improving the rock-...

AI Technical Summary

Problems solved by technology

When the drill bit encounters hard formations or alternating soft and hard formations during the drilling process, problems such as stick-slip and broken teeth often occur, which not only slows down the drilling speed, but also is not conducive to controlling the quality of the wellbore and is not conducive to the later stage Well cementing, well completion and other work

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