高渗透均质砂岩油藏提高驱油效率探索

Exploring to enhance the driving oil efficiency in high perk and equal quality sandstone reservoir

根据采收率的构成要素 ,结合油藏目前的特点 ,认为提高驱油效率是进一步提高采收率的必然方向 ;通过对驱油效率和剩余油饱和度、毛细管数和剩余油饱和度的关系研究 ,把工作目标放到提高毛细管数上 ;经过比较 ,得出了以减小油水界面张力为主的技术方法。通过对目的井的油分析和水分析 ,筛选出稳定性和界面张力满足要求的驱油剂配方 ,在相似的油层环境进行室内实验成功的基础上 ,在两口井上进行实际应用 ,取得了良好的降水增油效果。该技术适合高温、高盐的油藏环境 ,极大地降低了界面张力 ,提高了原油采收率 ,具有有效期长 。

Baseing on the inscape of recovery efficiency, combining the trait of reservoir presently, we think that it is the necessity direction heightening recovery ratio more to increase the driving oil efficiency. We regard to increase the number of capillary as the work goal by researching the relation of driving oil efficiency and saturation of remainder oil, the number of capillary and saturation of remainder oil. We elicit the technical measure basing mainly on minishing interfacial tension by comparing. By analyzing the oil and water of the aim oil well, we screen out the directions for producing chemicals of oil displacement agent to meet the demand in stability and interfacial tension. In the base of the successful experiment of lab in the similar reservoir environment, we obtain well effect in precipitation and adding oil by practice in the two well. This technic is adapt to the high temperature and dense salt reservoir environment, reduce greatly the interfacial tension, and enhance the oil recovery efficiency. It is provided with the trait in long period of validity and obvious effect.