酸化堵水一体用稠化剂的室内研究

Experiment Study of Thickening Agent in the Integrated Technology of Water Plugging and Acidification

为了满足酸化堵水一体化技术的要求,用水溶液聚合方法,合成了丙烯酰胺(AM)、二甲基二烯丙基氯化铵(DMDAAC)、甲基丙烯酰氧基乙基三烷基氯化铵(DMC)聚合物阳离子稠化剂,产物相对分子质量为800～1200万。室内评价结果表明,稠化剂最佳加量为1.0%,在5%、10%HCl溶液中的溶解时间为30min。HCl加量为5%、10%时,稠化剂酸液体系黏度分别为31.0、26.8 mPa·s,在72℃回流1 h后的黏度损失率分别为21.94%和32.46%;60℃时稠化剂在5%、10%盐酸中浸泡48 min后的黏度损失率分别为39.67%和36.12%。经过交联反应成胶后的黏度均大于100Pa·s,成胶时间均低于8 h。抗盐实验表明,随着矿化度的增加,稠化剂的溶解时间变长,但体系的初始黏度、成胶后的黏度、成胶时间变化较小。该稠化剂满足酸化堵水一体化技术的要求。

In order to meet the requirements of integrated technology of water plugging and acidification, the cationic polymer thickener with 8--12 million molecular weight was synthesized in laboratory by the method of polymerization in solution using acrylamide, dimethyl diallyl ammonium chloride and methyl propenyl acyloxy ethyl three alkyl ammonium chloride. Indoor evaluation experiment results showed that the optimum dosage of thickener was of 1.0% and the soluble time of thickener was of 30 rain in 5% and 10% HC1 solution. When 5% and 10% HC1 solutions were taken as a contrast to analysis the thickener performance, the initial viscosity of acid system was of 31.0 mPa. s and 26.8 mPa. s, respectively. After refluxing 1 h at 72℃, the viscosity loss rate was of 21.94% and 32.46%, and that was of 39.67% and 36.12% after soaking 48 min in acid. But after cross-linking reaction, gel viscosity was more than 100 Pa＇s, and gelation time was less than 8 hrs. Salt resistance experiment results showed that the soluble time extended with increasing salinity, but the initial viscosity of acid system, the viscosity of gel and gelation time were not affected. The thickener could meet the requirements of integrated technology of water plugging and acidification.