Study On Fracture Characteristics Of Fracture Re-orientation During Refracturing In The Glutenite Reservoir

Refracturing is an important technology for low permeability oilfield.Temporary plugging agent and oriented perforation are key factors affecting refracture reorientation.Though they have great significance,there are few researches on glutenite reservoir refracturing.The three axle hydraulic fracturing simulation experiment is used to stimulate the glutenite reservoir rock stress.This paper has studied the oriented perforation number,pore density,pore diameter,perforating depth,perforating azimuth angle and horizontal stress difference’s influence on gravel rock fracture extension.Combined with numerical simulation,further perforation parameters influence on crack extension has gained.In addition,the melting point,softening point,rheological characteristic,temperature tolerance,solubility,acid resistance and salt resistance of two kinds of temporary plugging agents are evaluated by laboratory experiments.Besides,the influence of particle concentration,injection volume,temporary plugging time and temperature on temporary plugging and unplugging are evaluated by core experiment.According to the results of laboratory test and core experiment,the temporary plugging agent suitable for different conditions is screened.With three axle hydraulic fracturing experiment,the temporary plugging agent’s effect in glutenite rock has been tested,and the type and concentration of the temporary plugging agent is optimized.Based on the study of the two key factors affecting fracture propagation,the paper summarizes the influence of the temporary plugging agent and oriented perforation parameters on glutenite reservoir fracture propagation.Moreover,the paper realizes the purpose of selecting a suitable temporary plugging agent and optimizing perforation parameters.