Temporary plugging setting mechanism and controllable temporary plugging fracturing technology of shale gas horizontal wells
Temporary plugging diversion fracturing technology in horizontal wells is one of the key technologies to increase shale gas production.This paper uses the numerical modeling method that combines the fluid dynamics software(FLUENT)and the Discrete Element Method(DEM)to investigate the migration rules of temporary plugging balls in the wellbore and the interaction of particles in the temporary plugging diversion fracturing technology in horizontal wells.It was found through establishing the DEM-DDPM coupling model that construction displacement,plugging ball density and diameter,and fracturing fluid viscosity are the major factors affecting the successful setting of temporary plugging balls.The simulation results indicate that when the construction displacement is between 4 and 6 m3/min,the density of the plugging ball is less or equal to that of the fluid,and when the erosion rate of perforation holes is within 6.15％,it can effectively improve the plugging efficiency.Meanwhile,as the viscosity of the fracturing fluid increases,the plugging efficiency first rises then falls.This research offers significant theoretical and practical guiding values for optimizing the volume of temporary plugging balls used in horizontal well fracturing and for optimizing the construction technology.
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