正确认识气藏高速非达西流湍流系数

文中给出了Forchheimer非达西渗流方程的二项式解。试井实例表明,利用二项式得到的非达西渗流湍流系数计算的产能与经验公式计算结果一致,说明了湍流系数可用于气藏工程产能预测和气藏方案设计。笔者导出的非达西渗流湍流系数理论方程与湍流系数经验公式具有一致性。理论方程分析可知,渗透率越低,非达西渗流湍流系数越高;高渗透储层不一定比低渗透储层更易产生高速非达西流气藏,不能根据非达西渗流的湍流系数来判断,而应根据储层流动的雷诺数高低来判断。

Further understanding on turbulence coefficient of high-speed non-Darcy flow of gas reservoir

This paper presents an equation solution of binomial expression for Forchheimer non-Darcy flow.The well testing example shows that the calculation result of turbulence coefficient for non-Darcy flow obtained from binomial is consistent with that of empirical equations,which shows that the turbulence coefficient can be used to predict productivity and development planning design of gas reservoir.At the same time,it is proved theoretically that the theoretical equation derived by the author accords with empirical equation.Through analyzing the theoretical equation,it is known that the lower the permeability is,the higher the turbulence coefficient of non-Darcy flow is.The non-Darcy flow in high permeability reservoirs is not more likely to have than that in low permeability reservoirs,which can not judged by the turbulence coefficient of non-Darcy flow and should be judged based on the Reynolds number of reservoir flow.