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首页> 外文期刊>Journal of Applied Polymer Science >Hydrolysable preformed gels for conformance control in oilwells: Properties and degradation
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Hydrolysable preformed gels for conformance control in oilwells: Properties and degradation

机译：油水中可水解的预制凝胶，适用于油井的一致性控制：性能和降解

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摘要

Conformance control using preformed gels (PGs) is an effective method to reduce water cut in production oilwells. However, PGs are unable to thicken formation of water, and the improvement of water-oil mobility is limited. Compared with PGs, hydrolysable PGs (HPGs) with labile crosslinker incorporated could thicken the brine gradually. In this study, a series of HPGs were prepared based on labile crosslinker poly(ethylene glycol) diacrylate, self-crosslinker N,N-dimethylacrylamide (DMAM), and nanomaterial laponite. The long-term thermal stability, swelling property, and thickening power of the HPGs were successively examined. It was demonstrated that DMAM remarkably improved the long-term thermal stability of HPGs, and also imparted the swelling and thickening properties during aging period, while laponite effectively increased the viscosity of HPGs suspension but weakened the swelling ratio. Degradation monitored by nuclear magnetic resonance spectroscopy indicated that HPGs are decrosslinked gradually through the hydrolysis of labile crosslinker and then release a terpolymer of acrylamide, acrylate, and DMAM. The hybrid fluid containing the terpolymer and nanomaterial resulted in the increased viscosity of HPGs suspension. Artificial core flooding results showed that HPGs have good sealing capacity for conformance control, and incremental oil was recovered by using HPGs against traditional PGs with similar plugging efficiency owing to the increased viscosity of the HPGs dispersion. (C) 2017 Wiley Periodicals, Inc.
机译：使用预制凝胶（PGS）的一致性控制是减少生产油水中的水切口的有效方法。然而，PGS不能加厚水形成，水油迁移率的改善是有限的。与PGS相比，具有掺入的不稳定交联剂的可水解PGS（HPG）可以逐渐加厚盐水。在本研究中，基于不稳定的交联剂聚（乙二醇）二丙烯酸酯，自交联剂N，N-二甲基丙烯酰胺（DMAM）和纳米材料Laponite制备一系列HPG。连续检查HPG的长期热稳定性，溶胀性和增稠功率。结果表明，DMAM显着提高了HPG的长期热稳定性，并且还赋予老化时期的溶胀和增稠性能，而兰蒙斯有效地增加了HPGS悬浮液的粘度，但削弱了溶胀比。通过核磁共振光谱监测的降解表明HPG通过不稳定交联剂的水解逐渐进行了逐渐释放，然后释放丙烯酰胺，丙烯酸酯和DMAM的三元共聚物。含有三元聚合物和纳米材料的杂化流体导致HPGS悬浮液的粘度增加。人工核洪水结果表明，HPGS具有良好的符合控制密封能力，通过使用HPGS对具有类似堵塞效率的HPG来回收增量油，由于HPGS分散的增加。 （c）2017 Wiley期刊，Inc。

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