耐高温酸液胶凝剂的制备及性能评价

Preparation and Performance Evaluation of Acid Gelling Agent with High Temperature Resistance

李晖 罗斌 李钦 郭淑芬 鲁红升 兰健

LI Hui LUO Bin LI Qin GUO Shufen LU Hongsheng LAN Jian

两性离子胶凝剂具有价格低和合成方便的优点，并能基于胶凝剂之间的超分子作用提升酸液的黏度。为 了构造可长期应用于深度酸化压裂的胶凝酸体系，以丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、二 甲基二烯丙基氯化铵（DMDAAC）或甲基丙烯酰氧乙基三甲基氯化铵（DMC）等为原料，以自由基水溶液聚合法 合成了2 种两性离子胶凝剂PAAD1（AM-AMPS-DMDAAC）和PAAD2（AM-AMPS-DMC）。对胶凝剂的制备条 件进行了优选，考察了其在酸液中的酸溶时间、增黏性能和耐温耐剪切性。结果表明，2 种胶凝剂的酸溶时间低 于40 min，增黏性能较好。将PAAD1 和PAAD2 按质量比7∶3 复配后，酸液黏度（25 ℃、170 s-1）可达39 mPa·s；在 160 ℃、170 s-1下剪切90 min 后的黏度为15 mPa·s。相较于单一的胶凝剂，复配胶凝剂的增黏、耐温和耐剪切性 能更佳。

Amphoteric gelling agent has the advantages of low price and convenient synthesis. It can improve the viscosity of acid based on the supramolecular effect of gelling agents. In order to construct the gelling acid system which can be applied in deep acidification fracturing well for a long time， two amphoteric gelling agents were synthesized from acrylamide （AM）， 2-acrylamide-2-methylpropanesulfonic acid（AMPS），dimethyl diallyl ammonium chloride（DMDAAC）or methacryloyloxyethyl trimethyl ammonium chloride（DMC）by free radical aqueous solution polymerization. The preparation conditions of gelling agents were optimized，and then the acid dissolving time，viscosity and temperature and shear resistance of gelling agents in acid solution were investigated. The results showed that the acid dissolving time of two amphoteric gelling agents were less than 40 min. Meanwhile，the viscosity increasing performance was good. The viscosity of acid containing the compound of two amphoteric gelling agents mixed in mass ratio 7∶3 was 39 mPa·s at 25 ℃ and 170 s-1，while that was 15 mPa·s at 160 ℃ and 170 s-1 after continuous shearing for 90 min. Compared with a single gelling agent，the compound gelling agent had better viscosity increasing property，temperature resistance and shear resistance performance.

10.19346/j.cnki.1000-4092.2022.04.004