气井高速非达西流动附加压降计算公式的修正

通常情况下 ,气井井轴周围的高速流动为非达西流动 ,产生附加压降。Forchheimer通过实验 ,提出了描述非达西流动的二次方程。但目前在计算平面径向非达西流动附加压降时 ,将上积分边界定为气井供气边界 ,与实际情况不符合。根据气体实际流动情况 ,对公式给予修正 ,并以实例比较了两公式计算的差别 ,证实气井实际非达西流动边界的影响不可忽略。

Pressure Drop Calculation Of Non Darcy Flow At High Velocity For Gas Well

Generally,flow at high velocity around well bore in gas well is belong to non-Darcian flow which arising adding pressure drop.The formula has been given by Forchheimer to illustrate the law of non-Darcian flow.but at present,upper integral boundary is defined as gas supplying boundary by gas well in calculating the non-Darcian flow with adding pressure drop at drainage radius which is not identical with the face.The paper modifies the equations based on actual situations and compares the differences between two calculations,which proves that the influence of non-Darcian flow in gas well to boundary is not neglect.