Production Transient Analysis Of Volume Fracturing Well In Tight Reservoir

With the rapid increase in global oil and gas demand,the development of tight reservoirs after shale gas exploitation has become a new hot spot for the exploration of unconventional oil and gas resources.Volumetric fracturing technology is usually used to effectively develop tight reservoirs.The application and research of long-term production data for reservoir volume fracturing wells are relatively few,including numerical model simulation and data interpretation methods for tight reservoir volume fracturing wells.The long-term production data are not effectively explained and applied,which affects the tightness The efficient development of oil reservoirs,therefore,this paper carried out the production transient analysis and application research on volumetric fracturing wells in tight reservoirs.Based on the different methods of volumetric fracturing reconstruction of tight reservoirs,two unstable seepage models of complex fracture network fracturing horizontal wells and dense cutting fracturing horizontal wells were established,and the seepage model was solved by Galerkin finite element method to obtain the dense To solve the productivity of horizontal wells for volume fracturing in reservoirs,the production performance calculation method for horizontal wells for volume fracturing considering arbitrary complex reservoir conditions and artificial fracture heterogeneity was established.Based on the production dynamic model,the typical curve morphology characteristics of the horizontal fracturing horizontal well Blasingame in tight reservoirs are drawn and analyzed,and the flow law of the volume fracturing horizontal well is revealed.The production dynamic model of the complex fracture network fracturing horizontal well mainly includes 6 flows.The stages are: SRV region linear flow stage,SRV region depletion flow stage,channeling stage,compound linear flow stage,late pseudo-radial flow stage and boundary pseudo-steady flow stage;the same dense cutting fracturing horizontal well production dynamic model It also mainly includes 6 flow stages,namely: fracture bilinear flow stage,SRV region linear flow stage,SRV region exhaust flow stage,compound linear flow stage,late pseudo-radial flow stage and boundary pseudo-steady-state flow stage.When the flow propagation reaches the boundary of the reservoir reconstruction volume area,the production dynamic curve shows that the SRV area depletion flow begins.This can be the time point to calculate the size of the reservoir reconstruction volume and evaluate the volume fracturing effect.On this basis,the effects of the reformed area,reservoir properties and artificial main fracture parameters on the typical curves of Blasingame under two tight reservoir volume fracturing horizontal well models were studied and compared,including the areas of different reformed areas and reservoir permeability.Factors such as the rate,the energy storage ratio in the reformed area,the channeling coefficient in the reformed area,the half-length of the fracture,the gap between the fractures,and the number of fractures provide a theoretical basis for the analysis of the Blasingame curve of volumetric fracturing horizontal wells.Based on tight reservoir volumetric fracturing horizontal well production dynamic model,a typical curve of volumetric fracturing horizontal well productivity is drawn,and the sensitivity analysis of the productivity curve characteristics and reservoir and fracture parameters is provided,which provides a theory for the prediction of volumetric fracturing horizontal well productivity.guide.The production performance analysis method of volumetric fracturing wells in tight reservoirs considering arbitrary complex reservoir conditions was established.The production data of a horizontal well in the YP block were dynamically analyzed,and the Blasingame typical curve was drawn using the production dynamic model of the volumetric fracturing horizontal well in the tight reservoir.The fitting analysis and production capacity prediction of the measured data were carried out.The results show that the transient dynamic analysis model of horizontal wells for volumetric fracturing in tight reservoirs can effectively explain the production data of example wells,and provide technical support for the dynamic analysis of tight oil reservoirs and the prediction of horizontal well productivity.