有机缓释微乳酸高效解堵剂的制备及性能研究

Preparation and Properties of Slow-release Organic Acid Micro-emulsion with High Efficient Plugging Removal

针对油田常用酸化方法存在酸液剖面不均匀和二次伤害的问题,优选有机酸和无机酸形成复合酸,优选表面活性剂和助表面活性剂,制备出有机缓释酸微乳液,其最优配方为:AQAS∶AEO=1∶1,正丁醇∶正辛醇=1∶1,水相∶油相=3∶7,助表面活性剂︰表面活性剂=1∶2,乙酸∶氢氟酸=4∶1。该体系的泥饼清除率超过85%,在低渗岩心中解堵效果显著,其渗透率恢复值超过100%。

In view of the problem of uneven acidizing profile and second damage during the acidification in stimulation,organic acids and inorganic acids were selected to form complex acids,and surfactant and co-surfactant also were optimized to prepare organic slow-release acid micro-emulsion.The formula is:AQAS∶AEO=1∶1,n-butanol:n-octanol=1∶1,water phase:oil phase=3∶7,co-surfactant∶surfactant=1∶2,acetic acid∶hydrofluoric acid=4∶1.The mud cake removal rate of the system is more than 85%,the plugging removal effect in the low-permeability core is remarkable,and the permeability recovery value is more than 100%.