耐温抗盐弱凝胶体系的研究
2015-10-21陈思桐孙毓
陈思桐 孙毓


摘 要:由于普通的弱凝胶体系在高温高盐的环境下成胶性能不稳定,室内研究优选合成一种以疏水缔合聚合物为主剂,再加入酚-醛复合有机交联剂及硫脲高温稳定剂形成的弱凝胶体系。体系中由于疏水缔合聚合物的疏水缔合作用有很高抗盐重要,酚醛复合交联剂抗温性能良好。通过分组对照试验确定了弱凝胶体系的最佳配方:疏水缔合聚合物质量浓度2 000 mg/L,酚-醛交联剂质量浓度800 mg/L,硫脲质量浓度200 mg/L。该体系经测试在高温高盐条件下具有长期的稳定性,抗剪切性能良好。
关 键 词:耐温;抗盐;弱凝胶;调驱;酚醛复合交联剂
中图分类号:TE 357 文献标识码: A 文章编号: 1671-0460(2015)07-1509-03
Research on Heat Resistance and Salt Tolerance Weak Gel System
CHEN Si-tong1,SUN Yu2
(1. Northeast Petroleum University, Heilongjiang Daqing 163000,China;
2. Daqing oilfield Co., Ltd. the First Oil Production Plant, Heilongjiang Daqing 163000,China)
Abstract: Because gelling performance of common weak gel system is not stable under the environment of high temperature and high salt. In this paper, the weak gel system was synthesized by using hydrophobic associating polymer as key agent, phenol-formaldehyde organic compound as crosslinker and thiourea as heat stabilizer in the laboratory. The hydrophobic association of hydrophobic associating polymer has high salt tolerance performance; phenolic aldehyde crosslinking agent has fine temperature resistant performance. The best formula of weak gel system was determined as follows: hydrophobic associating polymer mass concentration 2000 mg/L, phenol - formaldehyde crosslinking agent concentration 800 mg/L, thiourea concentration 200 mg/L. The system has long-term stability, good shearing resistance.
Key words: Heat resistance;Salt tolerance; Weak gel; Henolic aldehyde crosslinking agent
弱凝膠调驱是一种具有深部调剖和驱油双重作用的技术[1-3],是一种提高采收率的有效手段。油田注水开发后期面临水驱前沿突破,综合含水量高达90%,急需稳油控水。弱凝胶调驱技术通过向地层注入具有良好流动能力的低浓度聚合物和交联剂是体系可以进入低层深部,体系选择性进入高渗透层形成封堵改善地层的非均质性[4]。弱凝胶体系在后续水驱的作用下会向前缓慢“漂移”,起到类似聚合物驱的驱油效果。在高温高矿度油藏中传统的以部分水解的聚丙烯酰胺作为主剂的弱凝胶体系[5]存在难以成胶或成胶后易脱水、长期稳定性稳定性差等问题[6,7]。为扩展弱凝胶体系的应用范围,研发出一种具有耐温抗盐能力的弱凝胶体系有重要意义。
1 实验部分
1.1 实验物品与试验方法……p>
