四川河坝异常高压气藏的产能方程及其计算

四川盆地河坝气藏压力系数高达2.3，属于典型的异常高压气藏，如何建立该气藏的产能方程至关重要。常规二项式和指数式产能方程忽略了应力敏感的影响，计算的无阻流量一般大于实际值。在考虑岩石渗透率随地层压力呈指数函数变化的基础上，从气体的高速非达西渗流理论出发，推导出新的拟压力二项式产能方程及其求解方法。河坝１井的产能计算结果表明，考虑应力敏感的拟压力二项式产能方程所计算的无阻流量更加符合实际，对于开发类似高压气藏具有一定的参考意义。

Building up and calculation of a deliverability equation for Heba gas reservoir with abnormal high pressure in Sichuan basin

The Heba gas reservoir in the Sichuan basin belongs to typical abnormal high pressure gas reservoir whose pressure coefficient reaches 2.3, so it is vital how to establish a deliverability equation of such kind of gas reservoir. Since conventional binominal and exponential deliverability equations ignore the effect of stress sensitivity, the open flow potential calculated by it is always bigger than actual value. Considering that rock's permeability is exponential function along with formation pressure and starting from non Darcy percolation theory of gas at high speed, this paper derives a new pseudo pressure binominal exponential deliverability equation and its solution method. It is shown by the calculation result of the well Heba 1 deliverability that the open flow potential by pseudo pressure binominal exponential deliverability taking stress sensitivity into consideration is more coincidence with the actual, which is of reference in developing such gas reservoir with high pressure.