用液相色谱法研究复合驱中HPAM的水解度变化规律

Investigation of Hydrolysis Degree of HPAM in Chemical Combination Flooding System by Using HPLC

陈权生 栾和鑫 徐崇军 关 丹 阙庭丽 麦麦提·帕提古丽 邵洪志

CHEN Quansheng LUAN Huoxing XU Chongjun GUAN Dan QUE Tingli MAIMAITI Patiguli SHAO Hongzhi

在化学复合驱中所用的聚合物（部分水解聚丙烯酰胺HPAM及其衍生物）分子中的酰胺基易发生水解，导致化学驱体系的性能产生变化，影响化学驱的效果。采用高效液相色谱法快速测定化学驱体系微量样品中聚合物的水解度，用以研究不同条件下化学驱体系中聚合物水解度的变化规律。研究结果表明，在不同油藏条件下聚合物的水解反应受油田水质、化学驱体系的碱型、油藏温度等因素显著影响。34 ℃下，蒸馏水配制的聚合物溶液就可以检测到聚合物水解度的明显变化，NaHCO3水型的油田水会促进聚合物的水解。化学驱体系中水解反应速率大小依次为强碱（NaOH）体系＞弱碱（Na2CO3）体系＞无碱体系。当温度大于60 ℃时，各种体系中聚合物水解度在实验的90 d内持续增加，80 ℃下实验90 d时强碱体系的聚合物水解度接近60%。

The amide groups in the polymer （partially hydrolyzed Polyacrylamide and its derivatives） used in chemical combination flooding are liable to be hydrolyzed and their properties changed，resulting in reducing the effect of chemical flooding. A rapid high-performance liquid chromatography method for the determination of the degree of hydrolysis of polymers in trace samples of chemical flooding systems was described. It was used to study the variations of polymer hydrolysis degree in chemical flooding system under different conditions. Experimental results showed that methods could be applied for determination of hydrolysis of polymers in trace sample of chemical flooding，hydrolysis of polymers in the environment of reservoir was affected by connate water，alkali type of chemical combination flooding system，temperature and other factors. The degree of hydrolysis of the polymer prepared with distilled water at 34 ℃ could be obviously detected，oilfield water of NaHCO3 water-type could promote the hydrolysis of polymers. The rate of hydrolysis reaction in chemical flooding system was in turn：strong base（NaOH）systems ＞weak base（Na2CO3）systems ＞ base free systems. The degree of hydrolysis of polymers in various systems increased continuously during the 90 days of experiment when the temperature was above 60 ℃，the degree of hydrolysis of polymers in strong base system was close to 60% after aged for 90 days.

10.19346/j.cnki.1000-4092.2022.03.024