| 摘要: |
| 考虑井眼轨迹的井斜角、方位角、油液等对杆柱抽汲运动的影响，从定向井的多级混合杆抽油杆柱上选取微元 体,对该微元体做动力学分析。建立反映抽油杆柱动态变化的波动方程,作为有杆抽油泵系统故障诊断的初始动力 学模型。对整个杆柱采用变步长取样和多级杆柱的分界面处特殊处理，利用有限差分法求解偏微分方程，得到杆柱 上分界面处和均质段任意位置处的位移表达式。确定初始条件和边界条件,经差分和迭代计算获得抽油栗柱塞位 移表达式和载荷表达式，完成最终的建模。以油田提供的4 口油井的相关数据为例，代人诊断模型得到了泵功图并 对其进行故障诊断。结果表明:定向井有杆抽油泵系统诊断模型的建模方法是正确可行的，数学模型应用可靠，能 够支持基于知识和基于数据分析的故障诊断方法。 |
| 关键词: 建模分析 抽油杆柱 波动方程 泵功图 故障诊断 |
| DOI：10.3969/j.issn.1673-5005.2010.02.026 |
| 分类号:TE 833 |
| 基金项目:陕西省教育厅科学研究基金项目(08JK391) |
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| Modeling method for fault diagnosis to sucker rod pumping system in directional well |
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WANG Kai
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(Faculty of Mechanical and Precision Instrument Engineering, Xi'an University of Technology，Xi'an 710048, China)
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| Abstract: |
| Considering the influences of deviation angle，azimuth angle and oil on swabbing motion, the infinitesimal was selected from the multistage sucker rod string of directional well. The infinitesimal was analyzed. The wave equation reflecting the rod string's dynamic movement was established and acted as an initial kinetic model for fault diagnosis to sucker rod pumping system. Sampling with variable step method from the whole rod and executing a special treatment at the interface of multistage rod, the finite difference method solves the wave equation to obtain each expressions of displacement at homogeneity and interface positions of multistage rod. Confirming initial and boundary conditions, the expressions of displacement and load on pump plunger can be obtained by the difference and iterative computation to realize final modeling. Inputting the correlation data about 4 oil wells from oilileJd into mathematical model, and the indicator diagram of pump working was gotten to make a fault diagnosis. The results show that the modeling method is effective and the reliability of the model was verified. The model could support knowledge-based and data analysis-based fault diagnosis method. |
| Key words: modeling analysis sucker rod string wave equation indicator diagram of pump working fault diagnosis |
