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考虑致密储集层岩石及流体可压缩性和基质中流体的非线性渗流,建立了体积压裂致密储集层跨尺度渗流离散裂缝数值模拟模型,对模型进行了验证并进行了应用实例分析。模型采用两点流动近似方法计算传导率,并引入“星形-三角形”转换算法消除裂缝相交处的极细小网格,改善了计算稳定性。在时间域内采用全隐式离散,模型求解采用自动微分方法,提高了建模效率和计算精度。采用Eclipse软件模拟结果及新疆油田某致密储集层1口长体积压裂水平井的实际生产数据验证了模型的可靠性。实际应用结果表明,所建立模型能成功模拟大规模复杂缝网发育的储集层;缝网改造区越大,水平井产能越高;裂缝密度平面分布差异性及连通程度是影响致密油平面动用非均匀性的关键因素。
Considering the compressibility of tight reservoirs, the fluid compressibility and the nonlinear fluid flow in the matrix, a numerical simulation model of multi-scale seepage flow in fractured tight reservoirs in a volumetric fracturing reservoir is established. The model is validated and the application examples are given. The model uses the two-point flow approximation method to calculate the conductivity, and introduces “star-triangle ” conversion algorithm to eliminate very small grids at the intersection of fractures, improving the computational stability. In the time domain, all implicit discretization is adopted. The model is solved by automatic differential method, which improves modeling efficiency and accuracy. The reliability of the model is verified by the actual production data of Eclipse software simulation and a long-volume fractured horizontal well in a tight reservoir in Xinjiang Oilfield. The practical application shows that the established model can successfully simulate the reservoir of large-scale complex seam network. The larger the area of the seam network reforming, the higher the horizontal well productivity. The difference of the plane distribution and the degree of connectivity of the fracture density are the factors affecting the tight oil plane The key factor of non-uniformity.