低渗透气藏压裂井产能分析

Productivity analysis of fractured well in low permeability gas reservoir

基于低渗透气藏渗透率随拟压力呈指数函数规律的基础,考虑拟启动压力梯度存在的影响,根据扰动椭圆概念和等价发展矩形思想,研究了垂直裂缝井的产能计算方法,绘制并分析了产能理论曲线。研究结果表明,渗透率模数、拟启动压力梯度以及裂缝的长度均对压裂井产能产生影响。渗透率模数和拟启动压力梯度越大,裂缝越短,气井产能越小。

On the basis that the permeability of low permeability gas reservoirs shows as an exponential function along with pseudopressure,the productivity calculation method for wells with vertical fractures has been studied according to the concept of disturbed ellipse and the thought of equivalent developing rectangle with consideration of threshold pressure gradient.Theoretical productivity curve is drawn and analyzed.The result shows that permeability modulus,threshold pressure and fracture length all have effect on the productivity of fractured gas well.The higher the permeability modulus,the threshold pressure and the shorter the fractures are,the lower the productivity of gas well is.