低温活化过硫酸盐降解聚合物冻胶实验研究
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1.胜利油田东胜公司 山东东营;2.中国石油大学华东石油工程学院 山东青岛

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国家自然科学基金项目(面上项目), 基于吲哚嗪衍生物的新型酸化缓蚀剂及其作用机制研究(52074339)


Study on low temperature degradation of HPAM gel by activation of persulfate
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School of Petroleum Engineering,China University of Petroleum East China,Qingdao,Shandong

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    摘要:

    温度是影响聚合物冻胶降解的关键因素。针对低温油藏中聚合物冻胶引起的堵塞,提出使用过硫酸盐为氧化降解剂,通过低温活化的方法提高过硫酸盐的氧化性。首先利用自由基淬灭实验和自由基测试,确定了TA活化过硫酸盐降解聚合物机理;其次,研究了不同温度下活化体系中过硫酸盐浓度、TA浓度、地层水中阴离子等对降解聚合物冻胶的影响,优化了活化体系的配方,并评价了该体系的腐蚀性。结果表明,35℃时,TA活化过硫酸盐体系能够快速降解聚合物冻胶,形成的超氧阴离子自由基是降解冻胶的主要活性自由基。随着过硫酸盐浓度增加,降解率增大,但TA的浓度存在最佳值,而温度升高可以加快冻胶降解。和常规解堵剂相比,TA活化过硫酸盐能快速降解聚合物冻胶,且腐蚀性小。低温下,该体系比其他常规聚合物驱油藏解堵剂有更好的降解效果。

    Abstract:

    Temperature is a key factor limiting the degradation of polymer gel. Aiming at the blockage caused by polymer gel in low temperature reservoirs, the system of TA activated persulfate was proposed to use as a plugging remover to degrade polymer gel in this work. First, the quenching experiment and the radical test were used to determine the mechanism to degrade the polymer; the second was to study the effect of persulfate concentration, TA concentration, temperature and anions in formation water on the degradation, and the optimal reaction concentration was selected according to the change of polymer gel’s degradation efficiency and the corrosion with the concentration; Finally, the degradation effect of the system was compared with the conventional polymer plugging removers. The results showed that TA activated persulfate can rapidly degrade the polymer gel at 35 ℃, and the superoxide anion radicals are the main active radicals in degradation reaction. Compared with other polymer plugging removers, the said system of TA activated persulfate could rapidly degrade polymer gel with mild corrosion in the low temperature reservoir.

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  • 收稿日期: 2020-10-22
  • 最后修改日期: 2022-11-13
  • 录用日期: 2022-11-18
  • 在线发布日期: 2023-03-20
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