Fixed Axis Rotary Positive Displacement Power Tools

Abstract

The invention relates to a fixed shaft rotary positive displacement power tool. The fixed shaft rotary positive displacement power tool comprises an outer barrel, inner rotors, outer rotors, check rings, check ring sleeves, clamping springs for holes, TC bearing outer sleeves, upper TC bearing inner sleeves, lower TC bearing inner sleeves, eccentric bearing inner sleeves and eccentric bearing outer sleeves; a drilling column is connected to the upper end of the outer barrel; the inner rotors are mounted in the outer rotors through spiral teeth in an internal engaged mode and forms at least oneconjugate sealed cavity with the outer rotors, continuous rotation of the inner rotors can cause the conjugate sealed cavity to continuously move downwards to guarantee a working medium ( drilling liquid) propelled downwards in proper order or sequence; eccentric bearings are arranged at the upper end and the lower end of the inner rotors, the eccentric bearings are composed of the eccentric bearing inner sleeves and the eccentric bearing outer sleeves, and the eccentric distance of the eccentric bearings is equal to the center distance of the inner rotors and the outer rotors; and TC bearings are correspondingly arranged on the upper part and the lower part of the outer rotors. The fixed shaft rotary positive displacement power tool can be used as a downhole power tool, the inner rotorsmounted in the eccentric bearings make fixed shaft rotation under action of hydraulic pressure to provide rotation power for downhole tool combination, and the negative influence caused by centrifugalforce is eliminated.

Description

technical field [0001] The invention relates to the technical field of drilling engineering in the petroleum and natural gas industry, in particular to a downhole power tool. Background technique [0002] At present, the downhole power drilling tools used in oil and gas wells at home and abroad mainly include: screw drilling tools, turbo drilling tools, electric drilling tools, etc. The research and application of various drilling tools at home and abroad are different. In addition, the advantages and disadvantages of various drilling tools are also different. For example, the working torque of the screw drilling tool is related to the pressure drop and structure but has nothing to do with the speed. , but there is lateral vibration; although the turbodrill has the advantages of high-speed, high-torque softness and no lateral vibration, it has disadvantages such as high output speed and too long size of the whole machine; The structure of the reducer is complicated, the rel...

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Problems solved by technology

[0003] The invention provides a fixed-axis rotating volumetric power tool to solve the problem of lateral vibration in the downhole power tool in the prior art

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