Percussion drilling tool

Abstract

The invention discloses a percussion drilling tool, which relates to a drilling tool and solves the problem of low drilling efficiency on the hard formation of a deep well by the traditional drilling tool. The percussion drilling tool disclosed by the invention comprises a main shaft mechanism, an impact mechanism, a stationary shaft transmission mechanism and a motor mechanism, wherein the main shaft mechanism is positioned on the lowest end of the drilling tool; the upper end of the main shaft mechanism is connected with the impact mechanism capable of generating impact action; the impact mechanism comprises a hydraulic piston device, a rotary reversing valve and a pressure-limiting device; and the motor mechanism is positioned on the upmost end of the drilling tool and mainly consists of a motor and a flexible-shaft type universal mechanism. When the percussion drilling tool works, the drilling tool is driven by an external power mechanism to rotate, the drilling fluid is used for driving a motor rotor to rotate so as to drive a stationary shaft in the stationary shaft transmission mechanism to rotate, the rotary reversing valve is driven to reverse so as to change the fluid flowing direction at the inlet and the outlet of the hydraulic cylinder, so that the piston generates reciprocating movement, the hydraulic energy of the drilling fluid is converted into impact energy on the main shaft by the piston, and therefore the main shaft generates axial impact movement.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a percussion drilling tool used for geological drilling and oil drilling. Background technique [0002] At present, percussion drilling tools or impactors are commonly used for rock breaking and drilling of rock formations on the surface and shallow wells, because the impact method can produce obvious crushing effects on rocks, and it is difficult to achieve this by only rotating the drilling method. The purpose of gravel, so the drilling efficiency is extremely low. [0003] Yet the impactor of existing percussion drilling tool (or percussion tool) generally all is arranged on the ground, in the deeper well section owing to connect the drill pipe between impactor and drill bit longer, rigidity is relatively poor, under drilling weight, The drill pipe is easy to be bent and elastic, and in the elastic state, the impact force of the impactor cannot be effectively transmitted to the drill bit th...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a percussion drilling tool, which solves the problem of low drilling efficiency of existing drilling tools for deep well hard formations. The drilling tool has high axial vibration frequency, large impact force, high drilling efficiency, and It has multiple functions such as impact and pier drilling

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