| Optimization Design |
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| Research on valve seat cone angle of new inner blowout preventer based on erosion wear theory |
| ZHANG Xiao-dong, CHEN Long |
| College of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China |
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Abstract In view of the shortcomings of high failure rate of inner blowout preventer (BOP), a self-screwing conical seal inner BOP with novel structure and reliable sealing was presented. The valve seat cone angle of the new inner BOP was mechanically analyzed, and the valve seat cone angle was optimized by MATLAB. The numerical simulation analysis of internal flow field in the inner BOP was performed under different drilling fluid flows and valve seat cone angles by computational fluid dynamics (CFD) method （standard k-ε turbulence model and Tabakoff-Grant erosion model）and ANSYS CFX software based on the theoretical analysis conclusions. It was revealed that the parts of the erosion and wear were mainly concentrated on the edge of upper and lower valve seats and the lower wall. By comparing multiple groups of simulation data, it was determined that the optimal cone angle of the upper and lower seats of the inner BOP was 25°. ANSYS workbench static analysis software was used to simulate the contact stress distribution on the seal cone of upper and lower valve seats when the blowout occurred, and the conclusion of the optimal cone angle obtained from the erosion simulation analysis was verified. After the prototype was made, the sealing test was carried out to verify the reliability of the new inner BOP. The test results showed that the new inner BOP had no leakage and met the sealing requirements. The conclusion provides an important theoretical basis for the design and improvement of this type of inner BOP, which is of great significance for the safety upgrade of oilfield production equipment.
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Received: 19 June 2018
Published: 28 June 2019
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基于冲蚀磨损理论的新型内防喷器阀座锥角研究
针对现有内防喷器失效率高等不足，提出一种结构新颖且密封可靠的自旋合式锥形密封内防喷器。对该新型内防喷器的阀座锥角进行了力学分析，并采用MATLAB对阀座锥角进行了优化。基于理论分析得到的结论，采用CFD（computational fluid dynamics，计算流体动力学）方法（标准k-ε湍流模型及Tabakoff-Grant冲蚀模型）及ANSYS CFX软件，对该新型内防喷器在不同钻井液流量及不同阀座锥角下的流场进行数值模拟分析，仿真结果表明容易发生冲蚀磨损的部位主要集中在上下阀座流道边缘及下部管壁处。通过对比多组仿真数据，提出了该新型内防喷器上下阀座的最优锥角为25°，并采用ANSYS Workbench静力学分析软件模拟了井喷时上下阀座密封锥面的接触应力分布，验证了冲蚀仿真分析得出的最优锥角的结论。样机试制后进行了密封性实验以验证其可靠性，结果表明该新型内防喷器无泄漏，满足密封性要求。研究结论为内防喷器的设计与改进提供了重要的理论依据，对油田生产设备的安全升级有重要意义。
关键词：
内防喷器,
锥形密封,
冲蚀,
数值模拟,
阀座锥角
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