| Shengli Oilfield Block T reservoirs have buried deep, high temperature, high salinity of formation water features, belong to high temperature and high salt reservoir conditions,Commonly used ordinary polymer due to its bad temperature tolerance、salt tolerance, used in high temperature, high salt reservoir conditions is limited. In order to solve the problem of T block’s bad polymer EOR, urgently need a kind of temperature tolerance 、 salt tolerance polymer which has important meaning to improve T block oil displacement efficiency,increase production.In this paper, we use the sulfonated polymer、comb polymer and 35 million polymers for a series of performance evaluation,including viscosity increased, temperature resistance, salt resistance, shear stability, long-term aging stability, resistance factor and residual resistance factor, the results show that the sulfonated polymer’s comprehensive performance is better than the other three kinds of polymer, optimizing the sulfonated polymer as T block’s polymer displacement agent. In order to increase the viscosity of the sulfonated polymer, to further enhance oil recovery, triethanolamine and sodium gluconate is selected as complexing agent of metal ions, and carried out combination experiments, the results show that combination has synergistic effect, viscosifying action is better than adding a single complexing agent, select thiosulfate as antioxidant, also has a good viscosifying action.Laboratory core flooding Evaluation results show that combination complexing agents and antioxidants join together has the best effect on promoting chemical flooding recovery.carried out flooding system optimization experiments, the results showed that the optimum injection rate is 1m/d, the best slug injection volume is 0.57 PV, the best injection concentration is 1800mg/L, using the optimized formulation for T Block flooding effects verification experiments, chemical flooding recovery has reached 16.46%, meet the requirements of the block recovery. |
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