Based on the displacement discontinuity method and the discrete fracture unified pipe network model,a sequential iterative numerical method was used to construct a fracturing-production integrated numerical model of shale gas well considering the two-phase flow of gas and water.The model accounts for the influence of natural fractures and matrix properties on the fracturing process and directly applies post-fracturing formation pressure and water saturation distribution to subsequent well shut-in and production simulation,allowing for a more accurate fracturing-production integrated simulation.The results show that the reservoir physical properties have great impacts on fracture propagation,and the reasonable prediction of formation pressure and reservoir fluid distribution after the fracturing is critical to accurately predict the gas and fluid production of the shale gas wells.Compared with the conventional method,the proposed model can more accurately simulate the water and gas production by considering the impact of fracturing on both matrix pressure and water saturation.The established model is applied to the integrated fracturing-production simulation of actual horizontal shale gas wells,yielding the simulation results in good agreement with the actual production data,thus verifying the accuracy of the model.
关键词
页岩气井/水力压裂/压裂缝网扩展/气水两相流动/压裂-生产一体化数值模拟
Key words
shale gas well/hydraulic fracturing/fracture propagation/gas-water two-phase flow/fracturing-production integrated numerical simulation
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