泡沫与凝胶组合改善CO_2驱的性能

Foam and gel combination improve the performance of CO_2 flooding

针对CO_2驱过程中因为渗透率差异导致的波及效率低的问题,通过物模实验研究泡沫与凝胶结合提高气驱效果。结果表明,单独使用泡沫可以提高采收率18. 8%,注泡沫后再注凝胶可进一步提高采收率4. 97%,二次注泡沫可再提高采收率16. 27%。大段塞的凝胶注入在提高波及的同时会将剩余油封闭在储层中,不利于总采收率的提高。泡沫对储层无伤害,与少量凝胶配合使用可大幅度提高气驱效果。

In the process of CO 2 flooding,the problem of low flooding efficiency caused by the difference of permeability was studied.The effect of gas flooding was enhanced by the use of the foam and gel together.The results showed that the recovery rate was increased by 18.8%by using foam alone,and then the gel could be increased by 4.97%,and the recovery rate was 16.27%by the second foam injection.The gel injection of the large slug plug is not conducive to the improvement of the total recovery rate,it can seal the remaining oil in the reservoir.Foam has no harm to the reservoir,and the use of a small amount of gel and foam can greatly improve the gas drive effect.