表面活性剂对低渗透油藏渗吸的影响  

Effect of surfactants on imbibition of low permeability reserviors

作　　者：王小香[1] 吴金桥 吴付洋 杨江[1] Wang Xiaoxiang;Wu Jinqiao;Wu Fuyang;Yang Jiang(Department of Petroleum Engineering,Xi’an Shiyou University,Xi’an Shaanxi 710065,China;Research Institute of Yanchang Petroleum Co.,Ltd.,Xi’an Shaanxi 710065,China;The First Natural Gas Plant,Changqing Oilfiled Company of PetroChina,Xi’an Shaanxi 710065,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]延长石油公司研究院,陕西西安710065 [3]长庆油田分公司第一采气厂,陕西西安710065

出　　处：《石油化工》2019年第11期1157-1161,共5页Petrochemical Technology

基　　金：国家自然科学基金项目(51174163);陕西省统筹科技创新项目(2016KTZDGY09-06-01)

摘　　要：采用不同类型的表面活性剂进行自发渗吸实验,并对表面活性剂改善岩石润湿性、降低界面张力的能力进行了分析。实验结果表明,阴离子型表面活性剂改善润湿性的能力好于其他类型的表面活性剂,且在岩心中的自发渗吸效果最好,这是由于阴离子型表面活性剂改善润湿性的机理为离子对形成机理,强于阳离子的吸附机理;接触角是决定渗吸能否发生的决定性因素,只有接触角小于70°时渗吸才能发生;界面张力影响渗吸速度和最终采出程度,对于渗透率为1 mD的岩心,最佳界面张力为10^-1 mN/m。In order to explore the effect of different surfactants on spontaneous imbibition,the experiments with different surfactants were carried out,and the ability of improving the wettability of rock and reducing the interfacial tension was analyzed. The results show that anionic surfactants can improve wettability better than other kinds of surfactants,and the spontaneous imbibition effect is the best in core. This is because the mechanism of anionic surfactant improving wettability is ionpair formation mechanism,stronger than cationic adsorption mechanism. It is found that contact angle is the decisive factor to determine whether imbibition can occur,and only when contact angle is less than 70° can it occur. The interfacial tension affects the permeation rate and the final recovery degree. For the core with permeability of 1 mD,the best interfacial tension is 10^-1 mN/m.

关 键 词：自发渗吸 表面活性剂溶液 毛管力 界面张力 

分 类 号：TQ423.1[化学工程]