Productivity simulation of hydraulically fractured wells based on hybrid local grid refinement and embedded discrete fracture model

作者：ZHU Dawei,HU Yongle,CUI Mingyue,CHEN Yandong,LIANG Chong,CAI Wenxin,HE Yanhui,WANG Xiaoyong,CHEN Hui,LI Xiang

摘要：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.

發文機構：PetroChina Research Institute of Petroleum Exploration&Development Halfaya Project Peking University

關鍵詞：hydraulicfracturinggridrefinementembeddeddiscretefracturemethodreservoirnumericalsimulationproductivitypredictionparametersoptimization

分類號： TE357[石油與天然氣工程—油氣田開發工程]