乳化酸在低渗油层中选择性酸化的实验研究

~~渣返到地面 ;6对施工环境和操作人员的危害小 ;7原料来源广 ,价格便宜 .1 .1 .1　主体酸配方　主体酸为土酸 .增大 HF的用量 ,可提高溶蚀率 :考虑到酸液成本及 HF用量过高易产生二次沉淀 ,选定 w( HCl)为 1 0 % + w( HF)为5 %为主体酸酸液配方体系 .1 .1 .2　乳化酸配方　油外相乳化酸是一种不稳定体系 ,酸液中的盐酸、氢氟酸均是小分子易挥发物质 ,要使原油将酸液包住 ,对乳化剂的性能要求很高 .因此 ,必须研制出一种油溶性非离子表面活性剂 ,在室温条件下 ,可以将原油与酸液完全乳化成一定黏度的乳化液 ,可改变其加量及油酸比控制乳…

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

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 % .