两夹角不渗透断层对油井压力及压力导数的影响研究

Study on the Influence of Two Interacting Sealing Faults on Oil Well's Pressure and its Derivative

利用镜像映射和叠加原理推导了理想油藏中油井位于两夹角(θ)不渗透断层间定产量生产时的井底压力及压力导数表达式,分析了夹角不渗透断层对油井压力及压力导数的影响,并得出结论:油井无论位于夹角断层间哪一位置,其压力半对数曲线上均出现斜率为径向流第一直线段斜率360°/θ倍的第二直线段,压力导数曲线上出现值为360°/θ×0.5的第二水平线。

The mathematical expressions of bottom-hole pressure and its derivative for oil well which sites between two interacting sealing faults in ideal reservoir and is at constant production rate are established using mirror reflection and superposition principles.The influence of interacting sealing faults on oil well's pressure and its derivative is analyzed.Conclusions can be made that pressure curves on semilog graph will show the second straight line of slope 360°/θ times the first one corresponding to the radial flow and the derivative curves on log-log graph will show the second horizontal line with the value of 360°/θ×0.5,no matter where the oil well sites between the two interacting aults.