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微球聚合物强化水基钻井液流变稳定性及其分子模拟研究

许林 许力 吴舒琪 包宇 王晓棠 沈佳敏 孟双 王浪

许林,许力,吴舒琪,等. 微球聚合物强化水基钻井液流变稳定性及其分子模拟研究[J]. 钻井液与完井液,2023,40(6):693-702 doi: 10.12358/j.issn.1001-5620.2023.06.001
引用本文: 许林,许力,吴舒琪,等. 微球聚合物强化水基钻井液流变稳定性及其分子模拟研究[J]. 钻井液与完井液,2023,40(6):693-702 doi: 10.12358/j.issn.1001-5620.2023.06.001
XU Lin, XU Li, WU Shuqi, et al.Study on polymer microspheres for their action in enhancing rheology stability of drilling fluids through molecular simulation[J]. Drilling Fluid & Completion Fluid,2023, 40(6):693-702 doi: 10.12358/j.issn.1001-5620.2023.06.001
Citation: XU Lin, XU Li, WU Shuqi, et al.Study on polymer microspheres for their action in enhancing rheology stability of drilling fluids through molecular simulation[J]. Drilling Fluid & Completion Fluid,2023, 40(6):693-702 doi: 10.12358/j.issn.1001-5620.2023.06.001

微球聚合物强化水基钻井液流变稳定性及其分子模拟研究

doi: 10.12358/j.issn.1001-5620.2023.06.001
基金项目: 舟山市科技计划项目”海洋油气井密封损伤的压力控释靶向修复技术研发”(2019C21006)、浙江省基础公益研究项目”海洋油气开发微泄漏压差激活密封剂及其自适应修复机理研究”(LGG20E040002)。
详细信息
    作者简介:

    许林,副教授,博士,1979 年生,毕业于浙江大学物理化学专业,现在从事油田化学、计算化学、材料科学等方面研究工作。电话13567661648;E-mail: xuhu_11@yeah.net。

  • 中图分类号: TE254.1

Study on Polymer Microspheres for Their Action in Enhancing Rheology Stability of Drilling Fluids Through Molecular Simulation

  • 摘要: 聚合物分子空间构型从一维线型向三维体型转变,是改变传统油田化学处理剂分子设计的新思路,有利于新型多功能水基钻井液聚合物处理剂开发。为阐明体型高分子形态特征及其作为钻井液处理剂的有效功能,采用实验合成、结构表征、性能评价与分子模拟相结合的方法,系统开展了微球聚合物PAA-AM-AMPS强化水基钻井液稳定性研究。首先,合成了具有体型结构的微球聚合物PAA-AM-AMPS,评价了微球聚合物微观结构及其在恒流变和超高温水基钻井液体系的核心作用;然后,基于体型高分子基团空间分布的“补偿效应”模型,从分子水平揭示了体型构象对高分子-膨润土片层吸附的强化作用。研究结果显示:合成体型聚合物PAA-AM-AMPS是一种具有核-壳结构的微球粒子,平均粒径为198.3 nm;微球聚合物热解分为5个阶段,空间构型展示了良好热稳定性;微球聚合物分子具有内紧外疏的空间构型,活性基团—COOH、—CO(NH2)、—SO3H在球壳上的分布确定了体型结构活性位点,其中羧基C=O是主导活性基团;比较了链型和球型聚集态结构,后者具有更小的回转半径Rg和更大的径向分布函数g(r),显示了球型构象不仅提高结构的温度稳定性,也有利于维持壳层有效活性基团数量,确保与黏土片层的吸附缔合作用,最终提高水基钻井液宏观性能的稳定。

     

  • 图  1  微球聚合物粒径及形貌特征

    图  2  微球聚合物FTIR光谱曲线

    图  3  微球聚合物TG-DSC曲线

    图  4  水基钻井液A和B在中低温4 ℃、10 ℃、30 ℃、65 ℃的流变参数比较

    图  5  水基钻井液在40 ~ 240 ℃连续升温过程中剪切应力变化

    图  6  单体AA、AM及AA-AM-AMPS 重复结构单元静电势及前线轨道

    图  7  微球高分子PAA-AM-AMPS构象特征:(a)球型全原子模型构象;(b)粗粒化模型基团分布;(c)有效基团补偿

    图  8  不同PAA-AM-AMPS构象g(r)值随温度变化

    图  9  不同PAA-AM-AMPS聚集态 结构回转半径随时间变化

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出版历程
  • 收稿日期:  2023-08-10
  • 修回日期:  2023-08-30
  • 录用日期:  2023-08-30
  • 刊出日期:  2023-12-30

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