化学方法加速疏水缔合聚物溶解研究*
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1.成都工业学院 材料与环境工程学院;2.西南石油大学 油气藏地质及开发工程国家重点实验室;3.海洋石油高效开发国家重点实验室

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国家科技重大专项大型油气田及煤层气开发子课题实施方案项目“海上油田驱油聚合物的化学速溶方法探索”(项目编号CCL2018RCPS0037RON);油气藏地质及开发工程国家重点实验室开放基金课题“超分子协同作用提高缔合聚合物增黏效率机理研究”(项目编号PLN2020-3)


Accelerating the dissolution of hydrophobically associative polymers by Cyclodextrin
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    摘要:

    疏水缔合聚合物以优异的流变性能受到广泛关注。但是由于疏水基团间的相互作用,缓慢的溶解速度制约了其在油田上的大规模应用。目前已有的物理加速溶解方法都不可避免地造成缔合聚合物溶液黏度不可恢复的损失。本文利用环糊精(CD)对疏水基团的包合作用,加速缔合聚合物的溶解,且避免了溶液黏度损失。环糊精对疏水基团的包合改善了缔合聚合物与溶剂的相互作用,随环糊精与疏水基团摩尔比(CD:[H])增加,缔合聚合物溶解时间呈指数下降。流变学结果证明,环糊精能大幅缩短缔合聚合物解缠结时间。环糊精通过包合作用破坏疏水基团的缔合结构而加速溶解。利用环糊精对客体分子的竞争包合特性,通过向缔合聚合物溶液中添加适量的与环糊精具有更强亲和力的非离子表面活性剂可以完全恢复溶液流变性能。

    Abstract:

    Hydrophobically associating polymers are highly concerned for their excellent rheological performance. However, the poor dissolution caused by the interactions of hydrophobes restricts their popularization and application on oilfields. Irreversible viscosity loss of polymer solution will inevitably occur through the current physical accelerated dissolution modes. In this paper, cyclodextrins (CDs) are used to accelerate the dissolution of the hydrophobically associating polymer by the inclusion of hydrophobic groups, and avoiding solution viscosity loss. The inclusion of cyclodextrins on hydrophobes improves the interaction of associating polymers with solvents, and as the molar ratio of cyclodextrin to hydrophobic groups (CD: [H]) increases, the dissolution time of the hydrophobically associating polymer decreases exponentially. Rheology results have shown that CDs can significantly shorten the dissolution time of the hydrophobically associating polymers by disrupting association structures of hydrophobic groups through inclusion. Utilizing the competitive inclusion properties of cyclodextrin inclusion complex, the rheological properties of the solution can be completely restored by adding an appropriate amount of nonionic surfactants with stronger affinity to the CDs to the hydrophobes of associating polymer.

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  • 收稿日期:2021-04-18
  • 最后修改日期:2021-06-13
  • 录用日期:2021-07-01
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