Study On The Influence Of The Heterogeneity Degree Of Class ? Oil Layer On Weak-base Ternary Compound Flooding

ASP flooding as a highly efficient tertiary oil recovery method,its application scope is not confined to a kind of major reservoirs,with strong heterogeneity,oil heterogeneity degree of difference under different injection modes on the oil displacement effect of asp flooding effect,so this article in view of the second type reservoir,in under different injection ways and different levels of heterogeneity,The physical simulation experiment is carried out to study the effect of ASP flooding on oil displacement.This study has a certain practical significance for the development effect of ASP flooding on EOR of the second class reservoir.First,increases the viscosity of oil displacement agent,stability,and evaluate the interfacial activity and by adopting the method of integration of design and preparation of slab model,oil displacement agent can keep certain viscosity in the process of displacement and ultra-low interfacial tension,three layers of inhomogeneous slab model in saving resources and at the same time ensure that the pressure and resistance monitoring precision and tightness and pressure ability;Second,respectively,to carry out different front slug size and viscosity and ternary slug size and viscosity under different ternary slug alternate rounds,physical simulation experiment,comprehensive consideration to improve recovery factor and production performance data,pressure distribution,remaining oil distribution and production fluid properties,optimizing the mode of conventional injection and alternating injection displacement experiment scheme;Finally,a heterogeneous plate model with coefficient of variation of 0.59,0.65 and 0.72 was used to conduct physical simulation experiments of conventional injection and alternate injection respectively according to the optimized results.The results showed that,under the experimental conditions,the scheme with coefficient of variation of 0.59 had the largest area of water cut decrease after injection.The increase degree of injection pressure can be increased by 2%-8.5%,and the spread range of pressure is about40% and 25% higher,making it easier to form a higher pressure field.The spread range of oil saturation is relatively increased by 29.16%-40%,and the concentration of the visible agent in the produced liquid is low,and the effect of enhanced oil recovery is better,increasing by 1.57%and 0.85%,respectively.Weak base ternary has the best EOR effect.In the same degree of heterogeneity,the EOR effect of alternate injection is higher than that of conventional injection.With the increase of heterogeneity,it increases by 0.28% and 0.44% successively.For reservoirs with strong heterogeneity,alternate injection can achieve better oil displacement effect.