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首页> 外文期刊>Journal of Petroleum Science & Engineering >Numerical investigation of contact stress between rotor and stator in a two-lead progressing cavity pump
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Numerical investigation of contact stress between rotor and stator in a two-lead progressing cavity pump

机译：双导螺杆泵中转子与定子接触应力的数值研究

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摘要

The contact stress between rotor and stator in a progressing cavity pump (PCP) is critical to seal performance and service lifetime of the PCP. In this paper, an approach to predict the contact stress and friction behavior in PCPs is proposed. The approach is based on the results from the finite element analysis (FEA) and Stribeck-type curve. A three-dimensional finite element model for the contact stress between the rotor and the stator within a two-lead PCP is successfully established. The fluid pressure, the eccentric force and the laden torque are applied to the model. And the finite element analysis is conducted to investigate the contact stress between the rotor and the stator in the two-lead PCP. The simulated results show that the contact stress in the spiral seal lines (SPSLs) is always high compared to that in warping seal lines (WSLs) at the identical relative position, and the contact stress increases along seals from the first seal line to the last one. The maximum contact stress of the PCP appearing in every seal line is off-center. It is found that the serious wear and/or damage for the progressing cavity pump during operating always occurs on the paths which are off-center of the spiral seal lines. The results are validated against the actual phenomenon which appeared in oilfields from open literatures. (C) 2015 Elsevier B.V. All rights reserved.
机译：螺杆泵（PCP）中转子和定子之间的接触应力对于PCP的密封性能和使用寿命至关重要。本文提出了一种预测PCPs接触应力和摩擦性能的方法。该方法基于有限元分析（FEA）和Stribeck型曲线的结果。成功建立了两引线PCP内转子与定子之间接触应力的三维有限元模型。将流体压力，偏心力和负载扭矩应用于模型。并进行了有限元分析，以研究双引线PCP中转子与定子之间的接触应力。仿真结果表明，在相同的相对位置，螺旋密封线（SPSL）的翘曲压力始终高于翘曲密封线（WSLs），并且沿着从第一条密封线到最后一条密封线的密封条，接触应力都会增加一。在每条密封线上出现的PCP的最大接触应力是偏离中心的。已经发现，在运行中，螺杆泵的运行过程中，严重的磨损和/或损坏总是发生在螺旋密封线偏心的路径上。根据公开文献在油田中出现的实际现象对结果进行了验证。 （C）2015 Elsevier B.V.保留所有权利。

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