射孔完井水平井筒变质量湍流压降规律研究

运用拟三维原理 ,提出了用于计算地层刚性渗流、弹性不稳定渗流与水平井筒内变质量湍流耦合的新方法 ,解决了在井筒变质量流体流动模拟过程中井筒边界条件难以确定、地层线性渗流与井筒内非线性湍流难以耦合的问题。同时 ,对不同射孔方式和生产制度下流体水动力学进行了分析 ,研究了射孔入流与水平井筒内流体的相互作用关系及变质量主流体的流动特性。模拟结果表明 ,与圆管湍流相比 ,井筒内变质量流具有更大的压降系数 ,且主流中心速度降低 ,速度剖面呈现内凹形式 ,水平井射孔设计应该利用井筒内流体与渗流的耦合模拟进行优化。

Pressure drop of variable mass flow in horizontal perforated well bore

A new method for coupling linear flow in porous media (steady and unsteady) and nonlinear turbulent flow in horizontal well bore was presented. The pseudo-three-dimension principles and model were applied to hydrodynamics analysis of variable mass flow in the well bore. The interaction of the main flow and inflow of perforated well were discussed. The result indicates that the variable mass flow has bigger pressure drop than the turbulence flow in round pipe and has a concave section of velocity. The perforate design for horizontal well should be optimized with the coupling simulation of seepage flow and inflow of well bore.