杆式泵泵筒内流体流动规律的数值模拟

针对杆式泵泵简内的流体流动问题,采用湍流模型的K-ε两方程模型和有限元方法,对在一个抽油循环中阀与活塞在几个特定的位置的流体流动进行了建模与计算,具体分析了处于阀道内和同心环状空间中的原油在上下冲程的运动规律。通过计算知,泵筒内流体的最大速度与入口端的初始流连基本满足线性关系,而最大流压与入口端的初始流速不满足线性关系,直径大的泵,其流压整体上要比直径小的泵要小,分析结果可为杆式泵的内部结构设计和几何参数的确定提供一定的参考依据。

Numerical simulation of flow law of fluid in the barrel of sucker rod pumps

By means of the K- ε turbulence model and finite element method, the flow of the fluid in the valve and the piston during a cycle of pumping is simulated and calculated. The motion law of the crude oil in the valve passage and concentric annulus in the upstroke and downstroke is analyzed. Calculation results show that, the maximum speed of the fluid in the pump barrel has a linear relationship with the initial flow rate at the inlet; while the maximum flow pressure has a nonlinear relationship with the inlet initial flow rate, and the flow pressure of the large-diameter pump is lower than that of the small-diameter pump in total. The result of the analysis can provide a reference for the design of the internal structure of the rod pump as well as the determination of geometric parameters of the pump.