Numerical Simulation of Gas-Water Two-Phase Flow in Deep Shale Gas Reservoir Development Based on Mixed Fracture Modeling

Abstract In this paper, the development of a three-dimensional, two-phase fluid flow model (Modified Embedded Discrete Fracture Model) to study performances fractured horizontal well in deep-marine shale gas is presented. Deep-marine resources account for nearly 80% China, which decisive resource basis large-scale production. The dynamic characteristics deep reservoirs are quite different and more complex. This paper uses embedded discrete fracture simulate artificial fractures (main secondary fractures) dual-media mixed media natural considers partitions (artificial fractures, matrix). Gas desorption considered matrix. Different degrees stress sensitivity fractures. Aiming at accurately simulating whole production history fracturing, especially changes postfracturing flowback, initialization method based on fracturing construction parameters (fracturing volume pump stop pressure) established. water early stage after simulated, regional phase permeability capillary force curves introduced process flowback wells fracturing. influence closure gas-water characterized by sensitivity. A reservoir Sinopec was selected case study. simulation results show it necessary consider effects matrix when considering change during stages. findings can help better understanding distribution gas, principle, EUR prediction, provide theoretical effective groups.