Abstract
Any analysis of hydro-mechanically coupled production processes needs to consider flow in fractures and matrix coupled simultaneously. In this paper, fractures were described explicitly using a discrete fracture model. The fluid exchange term in the matrix and fracture governing equations was used to couple the flow in the fracture and matrix. Based on poroelasticity, the momentum and mass coupling of the standard equation were established for fractured porous media. An improved extended finite element method (I-XFEM) was used, and a solver was developed to solve the fully coupled model efficiently. In this model, fractures are decoupled from the grids, and the calculation efficiency was improved greatly. The improved enrichment functions were used to characterize the physical field and guarantee the calculation accuracy. The accuracy of the model was verified using a single-fracture model. A multi-fracture model was designed. The results showed that the cumulative production is positively related to the Elastic modulus and Poisson’s ratio, indicating that solid deformation on reservoir development has a significant influence and that the Elastic modulus and Poisson’s ratio have a significant effect on the reservoir stress sensitivity.
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