Fracturing Fluid Flowback Simulation And Parameter Optimization Of Tight Reservoirs

The development of tight reservoirs has attracted more and more attention from scholars at home and abroad,and the development of tight reservoirs must be combined with large-scale fracturing techniques such as multi-stage fracturing of horizontal wells to achieve effective development.Fracturing fluid backflow is an important part of the hydraulic fracturing operation.The flowback system directly affects the post-pressing effect.The fracturing fluid stays in the strata for a long time,damages the reservoir and blocks the seepage flow channel;at the same time,the improper control of the flowback rate will result in The proppant flowback affects the shape of the support joint and reduces the conductivity.Most of the sites rely on experience or refer to the routine hydraulic fracturing flowback rules to determine the flowback process parameters.In this paper,fluid mechanics,seepage mechanics,numerical simulation and other related theories as well as material balance principles are used to discuss problems such as two-dimensional fluid loss of fracturing fluid,dynamic closure of fractures,proppant return flow,and pressure drop along the pipeline,and the establishment of fracturing fluid returns.The mathematical model of the row,taking into account the effects of capillary force and multi-fractured coordinating flowback,formulating relevant application software to achieve the purpose of predicting the flowback rate of fracturing fluid,optimizing the flowback process parameters,and analyzing the critical flow rate,flowback The main factors and laws of the rate are given and the nozzle size selection method and returning scheme are given.It provides a more targeted theoretical model,backflow prediction,and functional software with optimized process parameters for the flowback of tight reservoir fracturing fluids.It can provide theoretical support for flowback construction and guide the on-site and reservoir-efficient development.