纳米颗粒矿化沉积及其提高钻井井壁稳定性应用研究
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1.中国石油大学华东;2.中石化胜利石油工程有限公司钻井工艺研究院

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国家科技重大专项《大型油气田及煤层气开发》课题五《致密油气开发环境保护技术集成及关键装备》(2016ZX05040005)


Research on the Mineralized Deposition of Nanoparticles and Its Application Exploration on the Improvement of Wellbore Stability
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    摘要:

    在泥页岩地层的钻井中,井壁稳定问题比较突出,由于页岩的特殊理化性质,极易吸水膨胀,导致井壁出现掉块、坍塌等情况,因此在钻井过程中需要对井壁进行加固。本文模拟生物矿化过程,对纳米颗粒自组装技术进行系统研究。本文在充分比较筛选了阳离子聚合物和纳米颗粒的基础上,进一步考察了改性纳米碳酸钙和BPEI的自组装沉积过程,并对沉积层的结构进行分析。实验结果表明,碳酸钙可在模拟井壁上形成形态良好的沉积层。另外,本文还探索这种技术在加固井壁,提高井壁的稳定性方面的应用,这也为井壁易失稳问题的解决提供了新的思路。

    Abstract:

    In the drilling of shale formation, the problem of wellbore stability is relatively prominent. Due to the special physical and chemical properties of shale, it is easy to absorb water and expand, resulting in the wellbore falling and collapsing, so it is necessary to reinforce the wellbore during drilling. In this paper,the process of biomineralization is simulated to study the self-assembly technology of nanoparticles. Based on the selection of cationic polymers and nanoparticles, this paper focused on the self-assembly deposition process of modified calcium carbonate and BPEI, as well as the structural analysis of the deposition layer. The experimental results displayed that modified nano-calcium carbonate could form a well deposition layer on the simulated well wall. In addition, this paper also explored the application of this technique on the improvement of wellbore stability which would provide a new strategy to solve the problem of wellbore instability.

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  • 收稿日期:2020-11-27
  • 最后修改日期:2021-04-16
  • 录用日期:2021-04-21
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