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以志丹油田樊川区为研究对象,进行化学水-氮气交注驱油室内实验研究。对比分析不同驱替方式下最终驱油效率的差异。纯水驱驱油效率为47.37%;化学水驱驱油效率为56.84%;纯气驱最终驱油效率26.62%;水气交替驱最终驱油效率58%;化学水气交替驱最终高驱油效率69.62%;水气交替驱油后采用一轮化学水气交替驱油最终驱油效率为73.43%,增油15.43%。
Taking Fanchuan Oilfield of Zhidan Oilfield as the research object, the laboratory experiment of chemical water-nitrogen injection and flooding was carried out. The differences of final displacement efficiency under different displacement modes are compared and analyzed. The driving efficiency of pure water drive is 47.37%; the efficiency of chemical water drive is 56.84%; the final drive efficiency of pure gas drive is 26.62%; the final drive efficiency of water-gas drive is 58% The efficiency is 69.62%. After the alternate displacement of water and gas, the final displacement efficiency of one-round chemical water-gas displacement is 73.43% and oil increase 15.43%.