井下旋流油气分离器流场数值模拟

鉴于现有油气分离器效率较低,为改善高含气井中井下多相混抽泵或电潜泵机组效率低下的问题,选择雷诺应力模型作为湍流模型,代数滑移混合模型作为多相流模型,对井下水力旋流油气分离器内的两相流场进行了数值模拟。通过数值计算得到了两相介质等浓度分布图和轴向速度矢量图,并将数值计算结果与同结构的水力旋流油气分离器样机的室内模拟试验结果进行了对比。研究结果表明,数值计算得到的各种图完全符合已知的旋流器流场分布规律。水力旋流器经过结构优化设计不仅可以进行井下油气分离,且分离效果较好,适用于较大流量和高含气率的油井条件。

Numerical simulation of flow field in downhole hydrocyclone oil-gas separator

As the efficiency of the current oil-gas separators is very low, and to improve the efficiency of downhole multiphase pump or electrical submersible pumping unit in high gas-content wells, the numerical simulation was studied on the two-phase flow in downhole hydrocyclone oil-gas separator. Meanwhile, the Reynolds stress model was chosen as turbulence model and the algebraic slip model was chosen as multiphase flow model. With the numerical calculation, the two phase media equoconcentration distribution map and the axial velocity vectogrph were obtained and proved to completely accord with the flow field distribution in cyclone. A contrast between the numerical simulated result and the result of pre-industrial prototype which has the same structure was carried on. The results show that the optimized hydrocyclone oil-gas separator not only runs well but also possesses good separating performance, and can satisfy the requirement of high flux and high GOR wells.