一种耐高温自组装酸化转向用聚合物的合成与评价  

Synthesis and evaluation of a high-temperature resistant self-assembling polymer for acidification diverting

作　　者：吴安林 张恒 孙亚东 吴越 杨立 全红平[2] WU Anlin;ZHANG Heng;SUN Yadong;WU Yue;Yang Li;QUAN Hongping(CNPC Chuanqing Drilling Engineering Co.,Ltd.Downhole Operation Company,Guanghan 618300,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油川庆钻探工程有限公司井下作业公司,四川广汉618300 [2]西南石油大学化学化工学院,四川成都610500

出　　处：《石油化工》2025年第4期487-494,共8页Petrochemical Technology

基　　金：四川省中央引导地方科技发展专项资助项目(2023ZYD0031);四川省科技计划资助项目(2019YJ0315)。

摘　　要：针对非均质储层均匀布酸难题,通过分子结构设计合成了一种新型甜菜碱单体1-乙烯基-3-丙基咪唑磺酸盐(PVIS),将其与丙烯酰胺(AM)、十八烷基二甲基烯丙基氯化铵(DMAAC-18)通过水溶液自由基聚合,合成了一种耐高温自组装酸化转向用聚合物(ADP),将ADP与阳离子表面活性剂十八烷基三甲基氯化铵(STAC)复配优选出配套的碳酸盐岩储层酸化用转向酸液,利用FTIR、1H NMR、SEM、粒径分析及高温流变测试等方法对试样进行分析。实验结果表明,ADP的优化合成条件为n(AM)∶n(PVIS)∶n(DMAAC-18)=73.5∶81∶3、单体含量30%(w)、引发剂加量0.6%(w)、反应温度50℃、反应时间6 h,ADP的结构与设计结构一致;优化合成条件下制得的ADP与表面活性剂STAC溶解在20%(w)的HCl溶液中复配得到的自转向酸液,在90℃下用碳酸钙反应完全后酸液表观黏度可达到280 mPa·s,具有良好的黏弹性,能够实现酸化转向的目的;自转向酸液残酸表观黏度具有较高保持率,表明自转向酸液具备优良的抗温、抗剪切性能。To solve the problem of uniform acid distribution in heterogeneous reservoirs,a novel betaine monomer 1-vinyl-3-propylimidazole sulfonate(PVIS)was synthesized through molecular structure design.A high-temperature resistant self-assembly acidification diverting polymer(ADP)was synthesized by free radical polymerization with acrylamide(AM)and octadecyl dimethyl allyl ammonium chloride(DMAAC-18)through aqueous solution.The ADP and the cation surfactant stearyl trimethyl ammonium chloride(STAC)were compounded to optimize the matching diverting acid solution for acidification of carbonate reservoirs.The samples were analyzed by FTIR,1H NMR,SEM,particle size analysis,and high-temperature rheological test.The experimental results show that the optimal synthesis conditions of ADP are as follows:n(AM)∶n(PVIS)∶n(DMAAC-18)=73.5∶81∶3,monomer content of 30%(w),initiator dosage of 0.6%(w),reaction temperature of 50℃,reaction time of 6 h.The structure of ADP is consistent with the design structure.The self-diverting acid solution is prepared by ADP and surfactant STAC dissolved in 20%(w)HCl solution under optimized synthesis conditions.Its apparent viscosity can reach 280 mPa·s after the complete reaction with calcium carbonate at 90℃,which has good viscoelasticity and can achieve acidification diverting.The apparent viscosity of the steering acid has a high retention rate,indicating that the steering acid has excellent temperature and shear resistance.

关 键 词：碳酸盐储层 转向酸 耐高温自组装 

分 类 号：TQ226.3[化学工程—有机化工]