天然气井井下定压节流阀数值模拟及结构优化

发布时间：2018-08-11 14:23

【摘要】：针对目前节流阀存在无法根据需要自动改变节流嘴尺寸等问题,利用ANSYS对一种新型天然气井井下定压节流阀进数值模拟,该节流阀可以根据节流阀入口压力的变化调节节流阀的开度,以保证节流阀出口压力基本保持在设计压力值范围不变,分析了节流阀在正常工作压力范围内、不同开度时,节流阀节流过程中的压力、速度和温度变化,仿真结果和理论计算结果相符;通过节流阀在气固两相流时的冲蚀磨损情况分析,表明在节流阀阀芯锥面冲蚀磨损最为严重,最大冲蚀率为4.413×10-7kg/(m2·s)。最后,基于前面分析结果对节流阀的阀芯和阀座进行结构优化,优化结果表明当节流阀阀座倾角β=10°时,阀芯冲蚀率最小;并对阀芯锥面进行氮化处理增强其耐磨性。
[Abstract]:In view of the problem that the throttle valve can not automatically change the size of throttle nozzle according to the need at present, the numerical simulation of a new type of natural gas well under constant pressure throttle valve is carried out by using ANSYS. The throttle valve can adjust the throttle opening degree according to the change of the throttle valve inlet pressure, so as to ensure that the throttle outlet pressure is kept basically unchanged in the design pressure range, and analyzes the throttle valve in the normal working pressure range, when the throttle valve opens at different degrees, The variation of pressure, velocity and temperature in throttle valve is consistent with the theoretical calculation results, and the erosion wear of throttle valve in gas-solid two-phase flow is analyzed, which shows that the erosion wear is the most serious in the cone of throttle valve core. The maximum erosion rate is 4.413 脳 10-7kg/ (m2 s). Finally, the structure of the valve core and seat of the throttle valve is optimized based on the results of the previous analysis. The optimization results show that the erosion rate of the valve core is minimum when the valve seat inclination is 10 掳, and the wear resistance of the valve core cone is enhanced by nitridation.
【作者单位】：西南石油大学机电工程学院;
【基金】：省部共建“石油天然气装备”教育部重点实验室项目(2015sts03)资助
【分类号】：TE931.2

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