Research on an On-line Profile Control and Flooding Emulsion Polymer Gel System and Its Application for Offshore S Oilfield
With the application and gradual promotion of on-line profile control technology in offshore oil fields,the research of on-line profile control system for offshore platforms has become a focus.In this paper,a water in oil emulsion polymer gel system suitable for on-line profile control and flooding of offshore platforms was developed.The effects of emulsion polymer content,cross-linking agent content,temperature,salinity and divalent ions on its system performance were studied,and the oil displacement performance of the system was evaluated through physical simulation experiments.The experimental results showed that the best system formula of water in oil emulsion polymer gel system was 0.2%~0.5%EM533+0.2%~0.5%SLPF,the gelling time was adjustable in the range of 2~5 d,and the gelling viscosity was controllable in the range of 185~5 893 mPa·s.The emulsion polymer gel system had good temperature resistance,salt resistance and resistance to divalent ions,and had good oil displacement performance.The core flooding test result revealed that it could enhance the pressure,and oil recovery efficiency was increased by 20.34%.