Rhythm-type high-frequency hydraulic pulse oscillation resistance-reducing actuator

Abstract

The invention discloses a rhythm-type high-frequency hydraulic pulse oscillation resistance-reducing actuator, and belongs to the technical field of petroleum operation equipment. The rhythm-type high-frequency hydraulic pulse oscillation resistance-reducing actuator is composed of a peristaltic short section and a power short section which are combined; the peristaltic short section and the powershort section are each in a hollow tubular shape; the peristaltic short section is in threaded connection with an upper joint on the upper part of the power short section through a lower joint on thelower part of the peristaltic short section, so that a pulse channel is formed between the peristaltic short section and the power short section; a lower opening of the upper joint is connected witha stator sleeve; a screw rotor is arranged in the stator sleeve in a matched mode; the upper end of the screw rotor is in clearance fit with a rotor front support, and a rotating valve disc is coaxially fixed to the lower end of the screw rotor; the rotating valve disc is in eccentric clearance fit with a fixed valve disc fixed to the stator sleeve; and a lower opening of the stator sleeve is connected with a drilling tool lower joint. According to the rhythm-type high-frequency hydraulic pulse oscillation resistance-reducing actuator, static friction is converted into dynamic friction with the tiny amplitude, axial friction and circumferential friction are reduced, and thus the problems of motor back-pressure, drill bit damage, drilling tool over-compression, drilling tool jamming, torquefluctuation, drilling tool reversing risk increasing, drilling tool fatigue and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of petroleum operation equipment, and in particular relates to a section-rate high-frequency hydraulic pulse oscillation drag reduction and speed increaser. Background technique [0002] The static friction between the drilling tool and the borehole wall has brought great challenges to the drilling construction of directional wells and horizontal wells. According to the direction, this static friction can be divided into two categories: one is axial friction during sliding drilling, and the other is circumferential friction during rotary drilling. Axial static friction leads to ineffective transmission of bit pressure; circumferential static friction leads to discontinuous rotation of drill tools. These two phenomena create a variety of problems for drilling operations: motor back pressure, bit damage, difficult tool face control, excessive drilling tool compression, stuck pipe, torque fluctuations, increas...

AI Technical Summary

Problems solved by technology

Axial static friction leads to the ineffective transmission of bit pressure; circumferential static friction leads to discontinuous rotation of drill tools

These two phenomena create various problems for drilling operations: motor back pressure, bit damage, difficult tool face control, excessive compression of drilling tools, stuck pipe, torque fluctuations, increased risk of drilling tool undercutting, drilling tool fatigue, etc.

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