封闭边界对变形致密气藏压裂井渗流影响

Effect of Sealed Boundary on Fluid Flow in Fractured Well in Deformable Tight Gas Reservoir

针对变形致密气藏的储层特征及渗流机理,利用摄动变换机制和反叠加方法求解圆形、矩形封闭变形致密气藏有限导流垂直裂缝井无量纲拟井底流压,绘制变形致密气藏压裂井试井理论曲线图版,形成一套快速有效的致密砂岩气藏压裂井动态反演技术及动态产能确定方法。通过苏里格气藏压裂井实例分析,验证了应力敏感性致密砂岩气藏压裂井产能递减典型曲线图版的准确性,有助于致密砂岩气藏的高效开发。

Based on the properties and flow mechanisms of deformable tight gas reservoir,the perturbation transformation and superposition were applied to solve the dimensionless pseudo bottomhole flowing pressures of finite-conductivity vertical fractured wells in circular,and rectangular sealed-boundary deformable tight gas reservoirs,and compile theoretical well-test chart. Then,a fast and effective dynamic inversion technique and dynamic productivity determination method is formed for vertical fractured well in deformable tight gas reservoir. The production decline type curve accuracy of vertical fractured well in stress sensitive tight sandstone gas reservoir is verified through the actual fractured wells analyses in Sulige gas reservoir,and this method will be favorable to the efficient development of tight sandstone gas reservoirs.