恒流堵塞器冲刷磨损特性的数值模拟

针对油田注水工况下,恒流堵塞器易受固体悬浮颗粒冲刷磨损作用的问题进行了数值模拟.以商业CFD软件F luent 6.1为基础,建立了恒流堵塞器流场三维几何模型,对堵塞器内部流场进行了计算;采用La-grangian离散相模型、Haider曳力公式和随机轨道跟踪方法求解了湍流中颗粒运动轨道;应用Bitter颗粒冲刷磨损模型对冲刷磨损失重进行了计算;对现场测试数据和数值模拟结果进行了对比,证明了数值模拟的有效性;对模拟结果数值上不够精确的原因进行了分析,指出了在注水流量控制装置流体磨损腐蚀分析中充分考虑电化学腐蚀和不锈钢钝化作用的必要性.

Numerical simulation of particle impact erosion within constant flux blanking plug

Because of severe downhole working conditions in oil-field water injection system,the constant flux blanking plug is liable to be affected by solid particle impact erosion.Numerical methods were used to analyze the wear rates of the pressure reducing and orifice valve ports.The 3-D geometrical model of the flow field was built and the flow field was calculated through commercial CFD code Fluent 6.1.And the Lagrangian discrete-phase model,Haider’s drag force law and the stochastic tracking method were adopted to track the particle motion.Then the erosion wear rates were calculated with Bitter’s erosion model.Numerical simulation results were compared to the field test data and the validity of the simulation was proved.The reasons of the inaccurate simulation results were analyzed,and the necessity to consider the electrochemical corrosion and the stainless steel’s inactivation effect in flow induced wear and corrosion analysis on water injection downhole flow control device was put forward.