表面活性剂驱油化学机理分析及降压增注实验研究  

Analysis on Chemical Mechanism of Surfactant Flooding and Experimental Study on Reducing Pressure and Increasing Injection

作　　者：李广辉 杨伟 魏军 赵高领 青顼栋 汪洋 LI Guang-hui;YANG Wei;WEI Jun;ZHAO Gao-ling;QING Xv-dong;WANG Yang(The Seventh Oil Production Plant of PetroChina Changqing Oilfield Branch,Qingyang Gansu 710000,China)

机构地区：[1]中国石油长庆油田分公司第七采油厂,甘肃庆阳710000

出　　处：《当代化工》2023年第12期2946-2949,共4页Contemporary Chemical Industry

基　　金：中国石油天然气集团公司工程技术科技统筹项目,长宁页岩气优快钻完井技术研究(项目编号:2021T-003-001)。

摘　　要：优选出适宜目标油藏的表面活性剂BHJ-A与BHJ-B,以界面张力为关键指标对其主要性能进行了评价,通过降压增注实验分析了表面活性剂对低渗岩心注入压力的影响,采收率实验预测了油水界面张力、表面活性剂段塞、注入速度与注入时机对采收率提高幅度的影响规律。结果表明:表面活性剂存在最佳质量分数使用范围,地层水矿化度较高时会对表面活性剂产生较大影响;表面活性剂会随时间推进逐渐失活;BHJ-A与BHJ-B对地层岩心降压率可达30%;表面活性剂段塞增加有助于采收率提高。Surfactants BHJ-A and BHJ-B suitable for the target reservoir were selected,their main performance was evaluated with interfacial tension as the key indicator,and the effect of surfactants on the injection pressure of low-permeability cores was analyzed through depressurization and injection enhancement experiments.Through recovery experiments,the degree of recovery improvement in different oil-water interfacial tensions,surfactant slugs,and injection rates was predicted.The results showed that there was an optimal mass fraction range for surfactants,and high salinity of formation water had a significant impact on surfactants;Surfactants gradually became inactive over time;The depressurization rate of BHJ-A and BHJ-B on the formation core could reach 30%;The increasing of surfactant slugs would help to improve oil recovery.

关 键 词：表面活性剂 低渗油藏 降压增注 采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]