控压钻井节流阀液-固两相流冲蚀预测及验证

运用欧拉-拉格朗日法和离散相模型,预测了节流阀内部粒子运动和分布规律,利用半经验冲蚀模型求解了颗粒对阀芯的冲蚀率,并设计相关实验验证了数值模拟的准确性。结果表明,数值模拟能够较为精确地预测节流阀阀芯的冲蚀轮廓;5 h以内的预测冲蚀损失量与实验数据贴合度很高,5 h以后的预测数据经合理修正后与实验结果相近,随冲蚀时间增长,预测误差逐渐减小,最终达到1% 以下;该模型能够用于预测控压钻井节流阀复杂流场的冲蚀,有望为控压钻井节流阀的进一步优化设计提供参考。

Prediction and verification on liquid-solid two-phase flow erosion of managed pressure drilling throttle valve

The Eulerian-Lagrangian model and discrete phase model are used to predict the internal particle movement and distribution law of throttle valve. The semi-empirical erosion model is applied to calculate the erosion rate of grain on valve spool. Meanwhile, relevant experiments have been designed to validate the accuracy of numerical simulation. Results show that the erosion profile of throttle valve spool can be predicted more precisely with the use of numerical simulation. The predicted erosion loss within five hours has a high consistency with experimental data, while that after five hours is close to the experiment results through reasonable correction. With the extension of erosion time, the prediction error will decrease gradually, eventually less than 1%. This method can be applied to predict the erosion of complex flow field in managed pressure drilling throttle valve, thus providing a reference for further optimization of the throttle valve.