温西三区块空气驱提高采收率试验研究

Experimental study on improving oil recovery in block Wenxi-3 of air injection

温西三区因为油藏渗透率低,注水后期水驱效果变差和注入能力下降,导致开发效果变差,而空气驱技术针对低渗油藏采收率的提高有一定的效果。为此,本文在温西三油藏条件下进行空气驱岩心驱替试验,试验研究不同空气段塞大小(0.05 PV、0.1 PV、0.2 PV、0.3 PV、0.4 PV)对提高采收率的影响。结果表明,随着空气段塞的增加,提高采收率的幅度变大,且低渗管采收率提高幅度高于高渗管。当空气段塞为0.3 PV时,提高的采收率为6.25%,采收率提高幅度最为明显。

Because of low permeability reservoir in block Wenxi-3,late period of water injection water flooding effect is poor and the injectivity decline,leading to the development effect is poor, and the air drive technology to improve the low permeability oil reservoir recovery have certain effect.Therefore, this paper air drive core displacement test in Wenxi-3 reservoir condition, experimental study on different air slug size（0.05 PV,0.1 PV,0.2 PV,0.3 PV,0.4 PV）to improve recovery.The results show that, with increasing air slug, improving recovery rate increase, the infiltration pipe recovery rate is better than that of hyperosmotic tube increase recovery rate.The results show that, with increasing air slug, enhanced oil recovery rate becomes larger, and the enhanced oil recovery rate of low permeability tube is better than that of hyperosmotic tube.When the air slug is 0.3 PV,improve the recovery rate was6.25 %,the recovery rate increased most obviously.