润湿性反转剂的微观渗流机理

Microscopic porous flow mechanics of wetting alteration agents

王凤清 姚同玉 李继山

WANG Feng-qing YAO Tong-yu LI Ji-shan

中国科学院力学研究所, 北京 100080 华北油田公司第二采油厂, 河北 霸州 065709 中国石油大学石油工程学院, 山东 东营 257061 中国科学院渗流流体力学研究所, 河北 廊坊 065007

为了研究润湿性反转剂对渗流过程的影响,对润湿性反转剂的微观渗流机理进行了研究。用接触角法和W ashburn法测定了固体表面的接触角,研究了润湿性反转剂对润湿性的影响;用界面张力仪测定了润湿性反转剂的油水界面张力,分析其降低油水界面张力的能力;并用微观刻蚀模型驱油试验研究了润湿性反转剂的微观渗流机理。试验结果表明:润湿性反转剂能改变表面的润湿性,使亲油表面变为亲水表面;润湿性反转剂有降低油水界面张力的能力,能使油水界面张力降低至10-1mN/m;润湿性反转剂使油膜剥离并形成油桥,使润湿性反转。该研究说明油水界面张力和润湿性都影响油水渗流特征,为进一步研究如何改善油水渗流过程奠定了基础。

In order to study the effect of wetting alteration agents to porous flow process,the microscopic porous flow mechanics was studied,contact angle of solid surface was measured by contact angle method and Washburn method,oil-water interfacial tension was measured by interfacial tensiometer,and the effect of the wetting alteration agents to the wettability of oil-wet surface was also studied.Finally,the porous flow mechanics of wetting alteration agents was studied by microscopic model.The experiments shows that the wetting alteration agents can change surface wettability,also it can reduce oil-water interfacial tension to 10-1mN/m;and during the porous flow process,peeled off oil film,formed oil bridge and altered wettability.This study displays that both oil-water interfacial tension and wettability of rock surface influence the characteristics of porous flow,and it provide a good base for more study to improve porous flow of oil and water.

10.3969/j.issn.1000-7393.2006.02.012