硅垢防垢剂ACAA的制备及性能研究

Synthesis and Performance Evaluation of Silica Scale Inhibitor ACAA

余兰兰 郑凯 李妍

YU Lanlan ZHENG Kai LI Yan

三元复合驱体系中的碱使油田注采系统中形成大量较难去除的硅垢。为解决油田注采设备日益严重的结垢问题，以乌头酸（AA）、柠檬酸（CA）、丙烯酸（AC）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）为单体、过硫酸铵为引发剂，制备了针对硅垢的共聚物防垢剂（ACAA），考察了合成工艺条件对产物防垢性能的影响，研究了ACAA的防硅垢性能与影响因素，分析了ACAA的防垢机理。结果表明，ACAA的最佳合成条件为：聚合温度70℃、聚合时间3 h、引发剂加量15%、单体摩尔比AA∶CA∶AC∶AMPS为2.0∶1.5∶1.0∶0.8。温度、pH值和ACAA加量对ACAA的防垢效果均有影响。ACAA对硅垢的防垢率随温度升高先增加后降低、随pH值的增加逐渐降低、随ACAA加量的增加而增大。在pH 为8、温度为55℃、ACAA 加量80 mg/L 的条件下，ACAA 对硅垢的平均防垢率为76.23%。ACAA对硅垢的防垢机理主要为吸附和分散作用。图7表2 参12

The introduction of alkali component in alkaline/surfactant/polymer（ASP）system led to the formation of a large number of silicon scale in oilfield injection-production system，and the silicon scale was difficult to remove when it once formed. To solve the severe problem of silicon scale in injection-production equipment，a new copolymer scale inhibitor for silicon scale called ACAA was synthesized by using aconitic acid（AA），citric acid（CA），acrylic acid（AC）and 2-acrylamide-2-methyl propane sulfonic acid （AMPS） as monomers，ammonium persulfate as initiator. The influence of synthetic process conditions on the anti-scaling property of products was examined，the properties and influencing factors of silica scaling prevention of ACAA were studied，and the scale inhibition mechanism was analyzed. The results showed that the optimum synthesis condition of ACAA was obtained as follows：70℃ polymerization temperature，3 h polymerization time，15% initiator dosage and 2.0∶1.5∶1.0∶0.8 monomer molar ratio of AA∶CA∶AC∶AMPS. The anti-scaling effect of ACAA was affected by temperature，pH value and ACAA dosage. The rate of silica scaling prevention of ACAA increased first and then decreased with increasing temperature，decreased gradually with increasing pH value，and increased with increasing dosage of ACAA. On the condition of pH=8，55℃ and 80 mg/L ACAA，the average prevention rate of silica scale was 76.23%. The main scale inhibition mechanism of ACAA to silicon scale was preliminarily considered as the adsorption and dispersion effect.

10.19346./j.cnki.1000-4092.2017.04.025