Study On Inter-fracture Interference Flow Law In Fracture-Vuggy Carbonate Reservoir

Fracture is the main flow media of fractured-vuggy carbonate reservoirs,which is highly heterogeneous.Flow interference between fractures has an important impact on oil well production.Based on the microscopic visualization mechanism model,this paper systematically studies the formation and development of the interstitial interference flow.Based on the results,the competition and shielding effects of the interstitial interference theory are proposed,and the quantitative characterization method of the interstitial interference degree is established.According to the established theory of inter-fracture interference,the experimental data are well fitted by finite element micro-numerical simulation method.On this basis,it is found that the greater the difference of fracture permeability and oil phase viscosity,the stronger the degree of inter-fracture interference;the longer the fracture length,the weaker the degree of inter-fracture interference.Based on the fitting equation,the mathematical form of predicting the degree of inter-fracture interference is determined.Finally,fractured cores are produced through carbonate outcrop,which verifies the correctness of the theory of inter-fractured interference,and further revises the prediction formula of inter-fractured interference to make it closer to the real situation of carbonate reservoirs.The research content has reference significance in analyzing the water production law of oil wells in fractured-vuggy carbonate reservoirs and in making decision on measures to improve oil recovery.