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选用柯 42 8井分离器油气样按目前压力等于泡点压力进行配样 ,用柯 2 33井的储层实际岩心进行了长岩心测试注氮气和烃类气评价 ,膨胀试验、细管试验及不同注入气对岩心驱替效率的影响研究。研究表明 :注氮气比注烃类气更易使泡点升高 ,膨胀能力不如烃类气强 ;所选烃类气、氮气和原油在目前地层压力下均不能混相 ;岩心试验表明烃类气越富或注入压力越高均会明显影响注气后的最终驱油效率 ,同目前油藏衰竭式开采相比 ,注N2 可提高驱油效率 6 .0 8% ,注富气可提高 18.8%～ 2 1.31% ,表现出较强的注气潜力。
Oil and gas samples from the well of Well Ke 42 8 were selected for sample preparation at the current pressure equal to the bubble point pressure. Nitrate and hydrocarbon gas evaluation, expansion test and thin tube test were carried out on the long core test using the actual core of Ke 2 33 well. Influence of Different Injection Gas on Core Displacement Efficiency. The results show that the injection of nitrogen gas is more likely to increase the bubble point than the injection of hydrocarbon gas and the swelling capacity is not as good as the hydrocarbon gas. The selected hydrocarbon gas, nitrogen and crude oil can not be miscible under the current formation pressure. The higher flooding or injection pressure will obviously affect the final flooding efficiency after gas injection. Compared with the current depletion recovery in oil reservoirs, injection of N2 can increase displacement efficiency by 6.08% and inject rich gas by 18.8% 2 1.31%, showing a strong gas injection potential.