合水油田复合缓速酸酸化技术研究  

On Composite Retarded Acid Acidification Technology in Heshui Oilfield

作　　者：吴大康[1] 刘丽丽[1] 薛俊林[1] 吴学庆[1] 

机构地区：[1]长庆油田公司第一采油技术服务处,陕西延安716000

出　　处：《长江大学学报（自然科学版）》2011年第10期41-43,276,共3页Journal of Yangtze University(Natural Science Edition)

摘　　要：针对合水油田长8储层超低渗透地层特征,在室内以盐酸、磷酸及潜在酸FA等进行复配,通过岩屑溶失性能测试,确定复合缓速酸酸液配方为8%HCl+2.5%H3PO4+2%CL+2%FA。缓速性能评价结果表明,该酸液与常规土酸相比,酸液的有效作用时间从2h提高到8h;岩芯流动试验表明,该缓速酸使天然岩芯的渗透率提高了3.21倍,具有良好的酸化解堵效果。The formulation of composite retarded acid was determined based on the characteristics of the ultra-low permeability of Chang 8 Reservoir in Heshui oilfield.The main part of retarded acid system is composed of hydrochloric acid,phosphoric acid and potential acid FA.Through the dissolve-loss ratio test of rock debris,the composition of retarded acid is determined as: 8%HCl+2.5%H3PO4+2%CL+2%FA.Evaluation results show that the effective time may be prolonged from 2 hours to 8 hours as compared with conventional mud acid.Through core flow test,it is found that the permeability of natural core may increase 3.21 times,by which a good acidification effect is obtained.

关 键 词：酸化 缓速酸 超低渗透储藏 溶失率 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]