Oil steam ratio evaluation chart formulation of thermal recovery and its application

on the basis of injection- production characteristic curves of heavy oil thermal recovery,by considering the statistical regularity between water drive reservoir geological reserves and water drive characteristic curve coefficients,the oil steam ratio evaluation chart under different recovery conditions has been established.The examples application results show the oil steam ratio chart can be effectively applied to the oil steam injection development and recovery evaluation under different stages.Meantime,it further broadens the application range of injection-production characteristics curve.