Fluid-solid Coupling Productivity Model Of Fractured Horizontal Wells In Xinjiang Glutenite Reservoir

At present,Xinjiang ’s MH block tight sandy conglomerate reservoir adopts the main development model of “horizontal well and volume fracturing”.Compared with the conventional vertical well fracturing in the early time,the development effect is better.However,due to the complex reservoir seepage relationship,it is difficult to predict production.It severely restricts the parameter optimization design of volume fracturing of horizontal wells in this type of reservoir.Therefore,it is urgent to establish a productivity prediction model suitable for tight glutenite reservoirs.Aiming at the difficult problem of accurately predicting the productivity of glutenite reservoirs,based on the reservoir fracture network reconstruction system model,a fluid-solid coupled productivity prediction model for a volume-fractured horizontal well was established,solved and applied.The specific research contents include: First,according to the characteristics of different fracture network transformation modes for horizontal well volume fracturing in tight reservoirs,considering the matrix-natural fracture dual porosity medium and the fracture network flow characteristics of discrete fracture modes,the tight reservoir volume Mathematical model of unstable percolation in fractured horizontal wells.The model was numerically solved using the finite element method to characterize the characteristics of unstable pressure in volumetric fractured horizontal wells.Then,based on this,productivity model of fractured horizontal wells based on fluid-solid coupling effect was formed in Glutenite Reservoir.The volumetric fracturing horizontal well productivity model in rock reservoirs compares and analyzes the difference in productivity between uncoupled and fully coupled volume-fractured horizontal wells.The results show that when fluid-solid coupling effects are considered,the initial production of horizontal wells is higher and the decline decreases significantly.Cumulative production decreased by about 8%.Finally,the example application part optimized the fracturing parameters using the model built.Based on the characteristics of glutenite reservoirs and considering the fluid-solid coupling factors,a more applicable volume-fractured horizontal well productivity prediction model is established.This model has certain guiding significance for optimizing fracturing parameters of glutenite reservoirs.