基于实际井眼轨迹的有杆泵抽油系统泵工况诊断方法

Diagnosis of pump working condition of sucker-rod pumping system based on actual well path

王文昌 狄勤丰 姚建林 姚斌

WANG Wenchang DI Qinfeng YAO Jianling YAO Bin

上海大学，上海市应用数学和力学研究所，上海市能源和环境工程中的关键力学问题重点实验室，上海　200072 中石油长庆油田分公司，陕西西安　710021

Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering, Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China Changqing Oil Field Company, Xi’an, Shaanxi 710021, China

井下泵工况的诊断是油田抽油杆系统的重要研究内容，根据基于实际井眼轨迹的抽油杆柱三维动力学振动方程，通过有限差分法进行时间和空间上的离散，并以实测近地面示功图为井下动态参数诊断的边界条件，迭代计算抽油杆柱任意截面一个周期内的载荷位移变化关系，实现对有杆抽油系统快速、准确的诊断，并利用井下实测功图数据来验证诊断结果的正确性。结果表明，利用本文方法诊断的泵示功图具有很好的精度，误差小于5%。

The pumping well diagnosis is an important research subject of sucker rod pumping system in oil field. In this paper, the three-dimensional dynamics equations of sucker-rod based on the actual well path was numerically analyzed by finite difference method on time and space discrete, and the relationship between load and displacement of sucker rod string motion of arbitrary cross section in one cycle, was iterative calculated with actual measured near-surface dynamometer cards as the boundary condition. The calculated results could provide a quick and accurate diagnosis of sucker rod pumping system, and the correctness of diagnosis results was validated by actually data for the fist time. The diagnosis results of pump dynamometers show that the diagnosis method presented in this paper has good accuracy and the error between simulation and actual measured down-hole dynamometer cards was less than 5%.