针对大裂缝储层强非均质性导致常规连续性介质模型难以刻画其特殊导流能力的问题,利用离散裂缝网络模型进行数值模拟,将大裂缝进行降维处理,以显式的方式表征于网格系统,利用非结构化网格进行油藏几何剖分,将裂缝作为虚拟边界,离散为降维控制单元,考虑相邻控制单元的维数差异,分别计算基岩-基岩、基岩-裂缝、裂缝-裂缝的传导系数,构建流动数学模型的有限差分数值计算格式。将方法应用于西部某油田T-6井组裂缝性油藏数值模拟,结果表明:井组生产历史拟合符合率达80%以上,剩余油类型主要为裂缝通道屏蔽剩余油与井间未动用剩余油,井间及生产层段之下的剩余油比例占60%以上,与实际认识较为相符。研究成果对含有大尺度裂缝的油藏数值模拟及剩余油分布研究具有较好的适用性,大裂缝降维处理能够显著提升计算效率。
To address the problem that the strong inhomogeneity of large fracture reservoirs makes it difficult to depict the special hydraulic conductivity with conventional continuous media models, a discrete fracture network model was used for numerical simulation, in which large fractures are subjected to a dimensionality reduction to be explicitly characterized in the grid system, unstructured grids were used for the reservoir geometrical sectioning, the fracture was taken as a virtual boundary and discretized into a dimensionality reduction control unit, and the finite-difference numerical computation format of the flow mathematical model was constructed by calculating the conduction coefficients of bedrock-bedrock, bedrock-fracture, and fracture-fracture respectively, and taking into account the dimensional differences of the neighboring control units. The method was applied to numerical simulation of fractured reservoir in Well Group T-6 in a certain western oil field. The results show that the production history fit compliance rate of the well group is more than 80%, the type of residual oil is mainly the shielded residual oil in fracture channel and the unused residual oil between wells, and the proportion of residual oil between wells and below the production interval accounts for more than 60%, which is more in line with the actual understanding. The study results have good applicability to the numerical simulation and residual oil distribution study of reservoirs containing large-scale fractures, and the dimensionality reduction treatment of large fractures can significantly improve the computational efficiency.
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