Research on a Nano Oil Displacement Agent Suitable for Emulsification and Viscosity Reduction of Ultra Heavy Oil
Due to its high viscosity and poor fluidity,heavy oil poses significant difficulties and challenges in its recovery.Therefore,reducing viscosity of heavy oil has become the key to improving its recovery rate.In this study,a nano oil displacement agent was prepared and its performance was evaluated.The research results indicate that the nano oil displacement agent can achieve a viscosity reduction rate of 99％for ultra heavy oil at a concentration of 1％;It has good temperature resistance and salt resistance,with a viscosity reduction rate of over 90％under conditions of mineralization of 30 000 mg/L and 350 ℃.It is suitable for most thermal recovery oil reservoirs,and can continue to be effective for more than 3 months under 50 ℃ conditions;This nano oil displacement agent can effectively reduce the interfacial tension between oil and water to a low interfacial tension range(＜10-2 mN/m);The dynamic adsorption experiment shows that the dynamic adsorption capacity of 1％nano oil displacement agent is 0.745 mg/g sand,and the adsorption loss is lower than 1 mg/g sand,which meets the requirements for surface active agent adsorption loss in on-site applications.
ultra heavy oilreduce viscosityoil displacement agent
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