乳化酸在低渗油层中选择性酸化的实验研究  

Experimental Research on Selective Acidization of Emulsified Acid in Low- permeability Reservoivs

作　　者：张玄奇[1] 尉立岗[1] 

机构地区：[1]西安石油学院资源与石油工程学院,陕西西安710065

出　　处：《西安石油学院学报（自然科学版）》2002年第5期50-52,共3页Journal of Xi'an Petroleum Institute（Natural Science Edition)

摘　　要：In order to solve the problem that conventional acidization may make water- bearing pore passage increase but make oil- bearing pore passage be unchanged in heterogeneous low- permeability reser- voir,a new emulsified acid formula system is developed,which can be prior into oil- bearing pore passage and remove deep blockage.The selection standard for the system is putforward.The characteristic of the system in viscosity and its acidization effectare studied with experiments.A large number of experimental results show that the viscosity will increase when the system meets with water and it will decrease when the system meets with oil.And itis also shown thatthe interfacial tension between the emulsified acid and oil is less than that between itand water.In static behavior,the acidization corrosion speed of the emulsi- fied acid is also less than that of conventional acids.The acidization corrosion percent of oil- bearing pore passage is over60 % ,and that of oil- bearing pore passage is below1 5 % .In order to solve the problem that conventional acidization may make water- bearing pore passage increase but make oil- bearing pore passage be unchanged in heterogeneous low- permeability reser- voir,a new emulsified acid formula system is developed,which can be prior into oil- bearing pore passage and remove deep blockage.The selection standard for the system is putforward.The characteristic of the system in viscosity and its acidization effectare studied with experiments.A large number of experimental results show that the viscosity will increase when the system meets with water and it will decrease when the system meets with oil.And itis also shown thatthe interfacial tension between the emulsified acid and oil is less than that between itand water.In static behavior,the acidization corrosion speed of the emulsi- fied acid is also less than that of conventional acids.The acidization corrosion percent of oil- bearing pore passage is over60 % ,and that of oil- bearing pore passage is below1 5 % .

关 键 词：乳化酸 低渗油层 选择性酸化 实验研究 三次采油 深部缓速酸化 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]