阳离子型Gemini润湿反转剂提高砂岩岩心原油采收率

A Study on the Reversal Wettability on Lipophilic /Hydrophilic Surface of Gemini Surfactant

张瑞杨杰樊开赟彭林秦妮叶仲斌

ZHANG Rui YANG Jie FAN Kai-Yun PENG Lin QIN Ni YE Zhong-Bin

本文研究了阳离子Gemini型表面活性荆（GS12-2．12）对砂岩岩心原油采收率的影响。结果表明：GS12-2-12在岩石表面能够产生动态吸附，动态吸附量为0．3～0．7mg／g。在润湿反转荆驱替后，亲水／亲油岩心表面都呈现向中间润湿状态转变的规律，接触角最大变化有50°。在此过程中，原油与岩心表面的黏附功有下降趋势，此趋势有助于减弱“贾敏”效应，降低油水运动阻力，驱油效率提高5％。在用可视化光刻蚀微观驱油模型研究润湿反转剂驱油过程中观察到了明显的油膜剥离现象，发现这种剥离式驱替方式启动了水驱难以启动的残余油。图5表3参9

The influence of the wettability alteration caused by cationic surfactant(GS12-2-12) on the oil displacement efficiency of the sand core was investigated in this paper.The results showed that both the hydrophobic and hydrophilic surface of the sand core would change to mid-wetting when displaced by GS12-2-12 aqueous solution,as a result,the dynamic adsorption of GS12-2-12 of 0.3—0.7 mg/g on the surface of the core was established,and the change of the contact angle was 50°to the most.During this process,the adhesion work between the crude oil and the surface of the core also descended,which would weaken the Jamin effect of the pore and reduce the resistance to motion of oil and water,resulting in enhancement of the oil recovery by 5%.The stripping oil film on the surface of the sandstone was observed by microscopic displacement test on photoengraving model,which displaced the remaining oil being difficult to be displaced by water flooding.