全金属螺杆马达输出特性研究

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中图分类号：TE921 文献标识码：A DOI：10.12473/CPM.202407072

Abstract：With the increasing exploitation of deepand ultra-deep wels in China，downhole temperatures continue torise.Traditional rubberPDMdrillisdificult toadapt toharshultra-hightemperature environment.Allmetal PDMdrill，characterized bylow sensitivity to temperature and excellent media resistance stability，demonstrates promising application prospects for reserve enhancement and production boosting of ultra-deep wells in the future.Taking the all-metal positive displacement motor（PDM）as an example，the fluid-solid coupling method was used to analyze the influence of metal positive displacement motor fit clearance，drilling fluid displacement and driling fluid viscosityon the pressure drop and rotor speed of the metal motor.The study results show that for anallmetal positive displacement motor witha7/8 lobe configuration and 6.5mm eccentricity，the motor pressure drop decreases as the fit clearance increases and decreasesas the driling fluid displacement and viscosity increase，and the rotor speed increases as the displacement increases.This proves that the motor pressure drop is affected bythe fitclearance，drilling fluiddisplacementand viscosity，while themotor rotationspeed is greatly affected bythedrilling fluid displacement.Moreover，basedon finite element analysis results，aprototype of llmetal PDM drill was designed and manufactured，with output torque exceeding 1O Ooo N·m，meeting thefield requirements.The study results play a certain role in the production and promotion of all-metal PDM drill.

Keywords：ultra-deep well；all-metal;positive displacement motor;fluid-solid coupling;torque；rotation speed;fitclearance

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