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鄂尔多斯盆地特低渗油藏CO2非混相驱实验研究

Wei WANG,Yongpan ZHAO,Shaojing JIANG,Xiqun TAN,Chunxia HUANG,Weibo WANG,Yingfei YAN

Journal of Xi'an Shiyou University(Natural Science)（2017）

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Abstract
针对鄂尔多斯盆地低渗低压裂缝性油藏水驱采收率低、CO2驱难以混相及气驱易窜流等问题,利用CO2-原油相态实验和岩心驱替实验,研究了CO2非混相驱提高采收率机理与方法.相态实验表明,地层条件下CO2与目标油藏原油难以混相,但在原油中溶解的摩尔分数可达60.20％,使原油体积膨胀30.16％,黏度降低64.29％.均质岩心驱替实验表明,CO2非混相驱在水驱基础上提高驱油效率23.25％.非均质岩心驱替实验表明,CO2非混相连续气驱效果随渗透率极差的增大而变差,在渗透率级差小于10的岩心驱替效果较好;水气交替在渗透率级差小于100的岩心取得一定的驱替效果,特别是渗透率级差10～30驱替效果最好.
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Key words
low permeability reservoir,CO2 flooding,immiscible gas flooding,continuous gas flooding,water-gas alternation flooding,sweep efficiency
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