长庆油田酸敏性地层分布广泛,80%以上的油并结垢为碳醮盐垢型,常用酸式清垢剂容易使酸敏性地层发生损害,乏酸可引起设备和管线腐蚀。本工作从酸的分子结构与性质关系及岩芯资料入手,采用含较多羧基和配位电子基团的酸为主体,复配成了清垢效果好、腐蚀性小、不引起地层酸敏、在低浓度时对钢铁基本无腐蚀的酸式清垢剂CQ-2体系。该剂经室内评价合格,在11口井进行了现场清垢解堵试验,解堵后油井产能增加。 Changqing Oilfield acid-sensitive strata are widely distributed, more than 80% of the oil and scale fouling carbon monoxide, commonly used acid-based cleaning agent prone to acid-sensitive formation damage, acid can cause equipment and pipeline corrosion. This work starts from the relationship between the molecular structure and properties of the acid and the core material. The acid with more carboxyl groups and coordination electron groups is the main component. The compounding has the advantages of good cleaning effect, small corrosiveness and no acidity , At low concentrations of basic corrosion-free acid steel cleaner CQ-2 system. The agent passed the indoor evaluation, in 11 wells conducted on-site cleaning plugging test, after plugging the oil production capacity increased.