表面活性剂在低渗透油气藏全过程保护中的应用进展

Application of Sufactants to Whole Formation Damage Control for Low Permeability Reservoirs

相圈闭损害在裂缝性低渗透油气藏中极为严重。概括了表面活性剂降低界面张力、改变润湿性的机理。氟表面活性剂可促进液相返排、预防相圈闭损害,故界面修饰显示出扩展屏蔽暂堵技术和欠平衡作业在低渗透油气藏全过程储层保护技术覆盖度的潜力。介绍了界面修饰在低渗透油气藏保护中的应用实例和氟表面活性剂的优良特性,指出进一步研究的发展方向。

Damages from Liquid phase trapping are very serious in naturally fractured reservoirs with low permeability.Mechanisms about interfacial tension reduction and wettability alteration caused by surfactant were briefly summarized.Fluorosurfactants were beneficial to liquid clean-up and prevention of phase trapping damage.Therefore,interfacial modification showed the potential on expansion of the technological coverage for temporary shielding technique and/or underbalanced operations during whole formation damage control for low permeability reservoirs.Cases of interfacial modification used in formation damage control of these reservoirs were introduced.The excellent properties of fluorosurfactant and its further developing tendency of researches had been discussed.