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根据实验结果和裂缝性压力敏感地层的特性,建立了适合于不同外边界条件下裂缝性压力敏感地层的不定常渗流模型.推导出了裂缝性压力敏感地层的不定常渗流模型的有限元方程.在对区域进行非结构化网格自动划分的基础上,利用有限元计算方法计算出了无限大地层、圆形有界地层以及线性组合边界地层的裂缝性压力敏感地层的井底压力的理论曲线,并对理论曲线特征进行了分析和对比.确定了压力敏感系数以及有效井径组合参数对理论曲线的影响,得到了确定压力敏感油气藏的地层参数的方法.通过某气田高温高压深层气井的实例分析,得到了较好的分析结果,同时也验证该文所建立的裂缝性压力敏感地层的不定常渗流模型的正确性.
According to the experimental results and the characteristics of fractured pressure-sensitive formations, an unsteady seepage model suitable for fractured pressure-sensitive formations under different outer boundary conditions is established, and the finite element equation of the unsteady seepage model of fractured pressure-sensitive formations is derived. Based on the automatic classification of the unstructured grids in the region, theoretical curves of bottom hole pressure of fractured pressure-sensitive formations in infinite stratum, circular bounded stratum and linear combination boundary stratum are calculated by finite element method , And analyzed and compared the characteristics of the theoretical curve.The influence of the pressure sensitivity coefficient and the effective combination of effective borehole diameter on the theoretical curve was confirmed and the method of determining the formation parameters of the pressure sensitive oil and gas reservoir was obtained.Through the study of the gas well under high temperature and high pressure in a gas field The analysis of the example shows that the analytical results are good and the validity of the unsteady seepage model of the fractured pressure-sensitive formation established by this paper is verified.