Research On Propagation Law And Diversion Capability Of Multi-level Fracture Propagation In Tight Reservoir

SRV fracturing plays an extremely important role in the development of unconventional tight reservoirs.The fractures generated by fracturing are used to communicate the natural fractures in the formation,thereby forming a complex and criss-cross fracture network in the reservoir to increase reservoir transformation.volume.The settlement and placement of the proppant in the fracture determine the final shape of the proppant distribution in the complex fracture network,and the distribution shape of the proppant determines the final shape of the fracturing fractures and the size of the fill layer conductivity.In order to grasp the law of proppant placement in the fracture network,this paper uses a self-designed multi-scale fracture network sand transport experimental device to study the proppant under different fracturing fluid viscosity,sand fluid displacement,particle size and construction sand ratio.The laying rule in the seam net.At the same time,combined with the physical simulation experiment,the preprocessing software Gambit was used to establish a three-dimensional model of the experimental device at a ratio of 1: 1.The Fluent software was used to simulate the settlement of the proppant in the seam network and carried out with the physical simulation experiment results.The comparative analysis verifies the feasibility and accuracy of the numerical simulation to study the proppant placement law in complex seams;and further simulates the proppant placement law in the seams under different densities.Based on the sand transport experiment,an experimental study on the proppant conductivity was carried out,taking into account the factors such as closing pressure,particle size combination,sand concentration,and stress-based loading on the proppant conductivity of the multi-scale main and branch fractures.influences.The research results in this paper provide basic data for the optimization of volumetric fracturing schemes and on-site construction,and have certain guiding significance for improving the efficiency of proppant placement in reservoir fracture networks.