Study on optimization of waterflood development mode and reasonable working system in low amplitude structure reservoir
Jurassic reservoir in H oilfield,Ordos Basin are characterized by small oil-bear-ing area,edge and bottom water and low structural amplitude.It's mainly developed by pat-tern water flooding,which has the problems of rapid rate of water cut increase and low final oil recovery.In order to study the reasonable development mode and reasonable working sys-tem of production and injection wells for the low amplitude structure Jurassic reservoir with edge and bottom water in H oilfield in Ordos Basin,a theoretical model of low amplitude structure reservoir with edge and bottom water is constructed based on the actual geological parameters of the reservoir.The effect of pattern water flooding and peripheral water flooding is simulated,and two development methods are evaluated by using the financial cash flow method.At the same time,the working system of produce and injection wells in the reservoir of the study area is simulated,including time of water injection,fluid producing intensity,water injection intensity,injection-production ratio.The research results show that the pe-ripheral water flooding development mode can improve the swept area effectively,and make the production wells respond uniformly,which has stronger adaptability to low amplitude structural reservoir with edge and bottom water and can get better economic benefits.Rea-sonable water cut of production wells to be reinjected is between 85.0%～90.0%in the study area and reasonable fluid producing intensity,water injection intensity,injection-production ratio is 1.1 m3/(d·m),2.0 m3/(d·m),1.15.The research results have a referential signifi-cance for the water flooding development of the similar reservoir.
low amplitude structurenumerical simulationedge and bottom waterwater injection modereasonable working system
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维普
