Vortex type hydraulic pulse axial impact tool

Abstract

The invention provides a vortex type hydraulic pulse axial impact tool, which comprises a tubular shell, a hydraulic pulse generating device is arranged in the shell, a jacket is connected to the casing to fix the hydraulic pulse generator, and a mandrel matched with it is arranged in the jacket , the connection between the jacket and the mandrel can be a spline or a polygonal connection, the lower end of the mandrel is connected with an anti-drop nut, and the characteristics of the pressure wave generated by the pulse generating device can be controlled by the growth and attenuation of the eddy current in the vortex cavity flow path, The flow path is a bistable jet switch, one flow path points to the tangential direction of the vortex cavity, and the other flow path points to the fluid outlet. By adopting the above structure, it has the following beneficial effects: the hydraulic energy at the bottom of the well increases the impact force of the drill bit, optimizes the flow field at the bottom of the well, improves the force condition of the drill bit and rock, and increases the mechanical penetration rate.

Description

technical field [0001] The invention relates to the technical field of drilling speed increase in oil and natural gas exploitation, and relates to a vortex type hydraulic pulse axial impact tool. Background technique [0002] In recent years, with the increasing number of horizontal wells and deep wells, when drilling hard and abrasive formations, the use of conventional power drilling tools generally has the problem of low ROP. In order to improve drilling efficiency, technologies such as pulsed cavitation jet drilling, rotary percussion drilling, particle jet drilling, ultra-high pressure jet drilling, and managed pressure drilling have emerged successively. However, these technologies have certain deficiencies in field application, such as particle jet drilling technology and managed pressure drilling technology with complex equipment and large investment, ultra-high pressure jet drilling technology needs to provide high-pressure mud pumps; rotary impact drilling technolo...

AI Technical Summary

Problems solved by technology

For example, in the patent CN201520631449, a hydraulic pulse device for drilling, a pulsed jet is formed through self-excited oscillation to apply periodic impact force to the drill bit, but the amplitude of the hydraulic pulse generated by the self-excited oscillation chamber is small, and the self-excited oscillation nozzle is vulnerable ; CN201520848134 In a vibrating impact short joint, the hydraulic pulse is generated by driving the dynamic and fixed valve through the screw or the turbine, and there are many moving parts, and the dynamic and fixed valve will be separated after wearing and tearing, and the hydraulic pulse generated by the closure will be weakened.

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