高强度乳液冻胶体系的研究与应用

Research and Application of High-strength Emulsion Gel System

为解决传统冻胶体系现场溶解困难和针对大孔喉的封堵效果差的问题,研究了一种可快速溶解的水溶性乳液聚合物为主剂的高强度冻胶堵剂体系,并评价了该体系的稳定性和封堵性能。实验结果表明,配方为5000 mg/L HPAM类聚合物乳液主剂+500 mg/L交联剂+1500 mg/L pH调节剂乙酸的体系,在60℃下可形成黏度为130 Pa·s以上的高强度冻胶,该冻胶体系具有良好热稳定性和针对大孔道的封堵能力,对大孔隙和裂缝的封堵率高达89.36%。此外,通过玻尔兹曼拟合建立了交联剂浓度与交联反应进程间的显函数关系,首次从理论上提出了一种通过调整交联剂浓度来控制冻胶体系黏度变化的方法。

In order to solve the problems of difficult on-site dissolution of traditional gel systems and poor plugging effect for large pore throats,a high-strength gel plugging system with a fast-dissolving water-soluble emulsion polymer as the main agent was studied and the thermal stability and sealing performance of system was evaluated.The experimental results showed that the system,composed of 5000 mg/L HPAM polymer emulsion+500 mg/L crosslinker+1500 mg/L acid,could develop a high-strength gel with viscosity above 130 Pa·s at the temperature of 60℃.the gel system has good thermal stability and sealing ability,the sealing rate of the system for large pores and cracks was up to 89.36%.In addition,a significant function between the cross-linking agent concentration and the cross-linking reaction process was established by Boltzmann fitting,and a theoretical method to control the viscosity of the gel system by adjusting the cross-linking agent concentration was put forward.