Using current Embedded Discrete Fracture Models (EDFM) to predict the productivity of fractured wells has some drawbacks, such as not supporting corner grid, low precision in the near wellbore zone, and disregarding the heterogeneity of conductivity brought by non-uniform sand concentration. An EDFM is developed based on the corner grid, which enables high efficient calculation of the transmissibility between the embedded fractures and matrix grids, and calculation of the permeability of each polygon in the embedded fractures by the lattice data of the artificial fracture aperture. On this basis, a coupling method of local grid refinement (LGR) and embedded discrete fracture model is designed, which is verified by comparing the calculation results with the Discrete Fracture Network (DFN) method and fitting the actual production data of the first hydraulically fractured well in Iraq. By using this method and orthogonal experimental design, the optimization of the parameters of the first multi-stage fractured horizontal well in the same block is completed. The results show the proposed method has theoretical and practical significance for improving the adaptability of EDFM and the accuracy of productivity prediction of fractured wells, and enables the coupling of fracture modeling and numerical productivity simulation at reservoir scale.

使用当前的嵌入式离散裂缝模型（EDFM）来预测压裂井的产能存在一些缺陷，例如不支持边角网格，井眼附近区域的精度低以及无视砂浓度不均带来的电导率的非均质性。基于角网格开发了一种EDFM，该模型可以高效地计算嵌入裂缝和矩阵网格之间的透射率，并通过人工裂缝孔径的网格数据计算嵌入裂缝中每个多边形的渗透率。在此基础上，设计了一种局部网格细化与嵌入式离散裂缝模型的耦合方法，通过将计算结果与离散裂缝网络（DFN）方法进行比较，并拟合伊拉克第一口水力压裂井的实际生产数据，验证了这一点。通过这种方法和正交试验设计，完成了同一区块第一口多段压裂水平井参数的优化。结果表明，该方法对提高EDFM的适应性和裂缝井产能预测的准确性具有理论和实践意义，并能实现裂缝模拟与储层规模数值模拟的耦合。完成同一区块第一口多段压裂水平井参数优化。结果表明，该方法对提高EDFM的适应性和裂缝井产能预测的准确性具有理论和实践意义，并能实现裂缝模拟与储层规模数值模拟的耦合。完成同一区块第一口多段压裂水平井参数优化。结果表明，该方法对提高EDFM的适应性和裂缝井产能预测的准确性具有理论和实践意义，并能实现裂缝模拟与储层规模数值模拟的耦合。