| This paper takes complex flooding characteristics of Heglig oilfield as the major target,Evaluated the feasibility of EOR technology in this oilfield and has involved both interfacial and emulsion properties of Sodium Carbonate,petroleum surfactant and partially hydrolyzed polyacrylamide,and also study the static and dynamic adsorption quantity of each composites,based on which indoor oil displacement efficiency of three element composites have been evaluated,The topic has theoretical significance and practical value.Final achievements and recognition include:Studied the basic parameters of the target reservoir,determined the reservoir type;According to its component features and the basic physicochemical parameters of crude oil as well as the ionic components of produced water and its concentration,selected kinds of surfactant and polymer.Through laboratory experiments comprehensive evaluated the interfacial tension performance and emulsifying properties of the ASP displacing agent as well as its stable performance,initially identified the effective concentration range of each component which can meet the technical requirements;According to the performance characteristics of displacing agent and economic costs,ultimately determined the interaction between each component of the ASP flooding and its best ratio of each component in the system;Studied the variation feature of each component in ASP flooding system during the long contacting process with the rock matrix,described the adsorption characteristics of each component in different system,determined the types of adsorption isotherms and adsorption equilibrium theory as well as the static adsorption capacity,and compared the amount of adsorption for each component of between the static adsorption process and dynamic adsorption process;Evaluated the flooding efficiency of the ASP solution,determined the ASP flooding can enhanced oil recovery 16.51% after the water flooding. |
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