A Method for Calculating the Degree of Water Drive Between Fracture and Matrix Based on Phase Permeability Data and Dynamic Data
According to the mechanism of water flooding,it is of great significance to study the production contribution and reserve production of fracture system and matrix system in the process of waterflooding development of fractured reservoir.According to the conserva-tion principle of injection and production and imbibition mechanism,the calculation method of oil production and recovery degree of fracture system and matrix system in the process of water flooding development is deduced by using Welge water flooding equation.Based on the phase permeability data and dynamic data,the Welge water displacement equation is used to calculate the water saturation of the fracture system through the water cut at the output end,the conservation principle of injection and production is used to calculate the water storage of the fracture system and matrix system,and the recovery degree of water displacement reserves of the fracture system and matrix system is calculated according to the imbibition mechanism.Finally,the changes of water saturation,water cut,oil production and recovery degree of fracture system and matrix system in the process of water flooding development are calculated.The calculation results show that this method can quantita-tively characterize the water cut variation characteristics and water drive development law of fracture system and matrix system in the process of water drive development of fractured reservoir,which can provide a basis for formulating the development technology policy of this kind of oilfield.
fractured reservoirphase permeability curveinfiltration absorptionmatrixdegree of recoverywater drive recovery factor
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