水平井杆管柱力学的有限元分析及应用

发布时间：2018-02-26 19:30

本文关键词： 水平井有限元法双层弹簧元扶正器仿真模型　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：近几年来,由于采油难度的加大和地质条件限制,水平井的数量不断增加。水平井的井眼轨道是一条连续光滑弯曲的空间曲线,抽油杆柱和油管柱的受力情况比较复杂,偏磨状况尤为严重。目前大多数油田采用大量配置扶正器的方法减轻杆管偏磨现象,大量扶正器使得抽油杆柱下行阻力增大甚至卡死,开发成本增加。本文根据油田实际情况,允许杆管柱部分位置发生接触,优化配置抽油杆扶正器间距,对油田实际生产有重要意义。本文主要研究内容如下:根据水平井的连续测斜数据,模拟井眼轨迹曲线;建立杆管柱底端集中力计算模型;分析水平井抽油杆柱及油管柱环境载荷组成,考虑了扶正器和接箍的沿程压差力和局部水头损失,改进了阻尼系数计算模型,完善了抽油杆柱的受力模型,建立了水平井油管柱的受力模型;通过分析油管柱内外压分布规律,建立了油管柱内外压的计算模型;以抽油杆柱为研究对象,结合空间梁有限元法和双向弹簧元法,建立了杆管柱的单层接触系统有限元仿真模型;以整个抽油杆柱与油管柱为研究对象,建立了抽油杆柱、油管柱和套管柱的双层接触系统的有限元分析模型;引入双层多向弹簧元,建立了抽油杆柱、油管柱和套管柱的双层接触系统的弹簧元仿真模型,模拟抽油杆柱、油管柱和套管柱间的接触位置和接触压力;根据抽油杆柱所受的轴向载荷、弯矩和扭矩,采用等强度理论校核抽油杆柱强度,并对抽油杆柱组合进行优化设计;根据抽油杆柱、油管柱间的接触位置和接触压力,对扶正器的配置间距进行优化设计;利用Visual Basic 6.0编写了《水平井杆管柱力学的有限元分析软件》,进行井眼轨迹模拟;杆管柱横向振动仿真;水平井抽油杆柱组合优化与校核;扶正器配置方案优化。
[Abstract]:In recent years, due to the increasing difficulty of oil recovery and the limitation of geological conditions, the number of horizontal wells has been increasing. The borehole track of horizontal wells is a continuous smooth curved space curve, and the stress situation of sucker rod string and tubing string is quite complex. The condition of partial wear is especially serious. At present, a large number of centralizers are used in most oilfields to reduce the phenomenon of eccentric wear of rod and pipe, and a large number of centralizers make the downlink resistance of sucker rod string increase or even jam, and the development cost increases. It is of great significance to optimize the spacing of sucker rod centralizer for the actual production of oil field. The main contents of this paper are as follows: according to the continuous skew data of horizontal well, the trajectory curve of borehole is simulated; The calculation model of the concentrated force at the bottom of the rod string is established, the environmental load composition of the rod string and tubing string in horizontal well is analyzed, the pressure difference along the path and the local head loss of the centralizer and hoop are considered, and the damping coefficient calculation model is improved. The stress model of the sucker rod string is perfected, the stress model of the tubing string in the horizontal well is established, the internal and external pressure distribution law of the tubing string is analyzed, the calculation model of the internal and external pressure of the tubing string is established, and the sucker rod string is taken as the research object. The finite element simulation model of single-layer contact system of rod string is established by using space beam finite element method and bi-directional spring element method, the whole sucker rod string and tubing string are taken as the research object, and the sucker rod string is established. The finite element analysis model of double-layer contact system between tubing string and casing string, the spring element simulation model of double-layer contact system of sucker rod string, tubing string and casing string is established by introducing double-layer multi-directional spring element, and the simulation model of sucker rod string is established. The contact position and contact pressure between tubing string and casing string; according to the axial load, bending moment and torque of sucker rod string, the strength of sucker rod string is checked by equal strength theory, and the combination of sucker rod string is optimized. The contact position and contact pressure between tubing strings are optimized to design the collocation spacing of centralizer, the finite element analysis software of rod string mechanics of horizontal well is compiled by Visual Basic 6.0 to simulate wellbore trajectory, the lateral vibration of rod string is simulated. Optimization and check of sucker rod string in horizontal well and optimization of centralizer configuration.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE933

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