高温土酸酸化缓蚀剂用于中,低温注水井的各种土酸酸化作业

本文介绍了在大庆油田将高温低点蚀土酸酸化缓蚀剂８４０１Ｊ（１２０℃）用于中、低温（＜１００℃）地层注水井的除垢、解堵及基质酸化的情况，所用酸液除常规土酸外，还有胶束酸和磁化酸，缓蚀剂加量为０．５％—１．５％，缓蚀效果优于大庆油田的使用的其它各种酸化缓蚀剂

EXPANSION OF XIAZIJIE BENTONITE IN DIFFERENT ALKALINE SOLUTIONS

As a part of the flooding system selection for the ASP flood program in Karamay Oil Fields (field operations have started in Aug. 1995), the swelling of bentonite from Xiazijie, Xinjiang, in Na 2CO 3 and Na 2CO 3/NaOH (equal molar ratio) solutions containing 0.3436% NaCl over up to 96 hrs is investigated. It is shown that the expanding degree goes through a maximum with increasing alkali concentrations in both cases and the expansion is higher in Na 2CO 3 solutions than that in Na 2CO 3/NaOH solutions. The later findings is explained by the reduction in negative electric charge on clay grain surface caused by adsorbed Al 3 ions from reaction solutions.