Propagation and optimization of complex fractures of shale gas wells based on FEM-DFN:taking horizontal well group X1 in Changning shale gas reservoir as an example
Problems such as the unclear understanding of fracture propagation pattern of horizontal wells and frequent inter-well interfaces in Changning Shale Gas Demonstration Area have seriously restricted the high-efficient exploitation of shale gas reservoirs.To address this problem,based on the idea of geology-engineering integration,combined with the finite element-discrete fracture network(FEM-DFN)method applicable to multi-well fracturing analysis,the volume fracture propagation pattern of horizontal well groups and the influence of natural fractures on hydraulic fracture propagation were analyzed,and the inter-well interference factors were clarified.The reseults show that in the area where natural fracture zones are developed,the natural fracture zone dominates the hydraulic fracture propagation behaviors by inducing,capturing and blocking the hydraulic fractures.The asymmetric propagation of hydraulic fractures caused by natural fracture zones and non-uniform fracture initiation are important reasons for inter-well interferences.The degree of development of various types of fractures in natural fracture zones has a significant impact on hydraulic fracture propagation The research results can provide support and basis for the design of high-efficient hydraulic fracturing parameters in Changning shale gas reservoir.
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