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科技导报  2014 

高钙镁油藏钙镁离子对聚合物溶液黏度的影响

DOI: 10.3981/j.issn.1000-7857.2014.003, PP. 30-33

Keywords: 高钙镁油藏,耐温抗盐聚合物,钙镁络合剂,提高采收率

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Abstract:

针对江汉油田某区块回注污水钙、镁离子质量浓度高的特点,以耐温抗盐型聚合物为研究对象,研究了高钙镁条件下钙镁离子对聚合物溶液黏度的影响。通过分析一价阳离子(Na+、K+)与二价阳离子(Ca2+、Mg2+)对黏度影响的定量关系,提出了等效矿化度和等效阳离子量的概念,可作为高钙镁条件下聚合物溶液黏度评价的指标。为了降低钙镁离子对黏度的影响,向溶液中加入钙、镁离子络合剂(柠檬酸钠)提高聚合物溶液的黏度。实验结果表明,柠檬酸钠虽然不能完全消除钙镁离子对黏度的影响,但它具有较高的络合能力,溶液增黏效果较好。本研究为高钙镁油藏聚合物驱技术提供了理论指导。

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