抗高温插层吸附抑制剂的研制及作用机理
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1.中国石油长城钻探工程有限公司工程技术研究院;2.中国石油长城钻探工程有限公司钻井一公司

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国家科技重大专项(2016ZX05020-004)、中石油天然气集团公司科技项目(2018E-2108)与长城钻探科技项目(GWDC202102-0104)资助


Development and Function Mechanism of High Temperature Resistance Intercalation Adsorption Inhibitor
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    摘要:

    针对常规抑制剂控制黏土表面水化不足导致的井壁失稳问题,研制了抗高温插层吸附抑制剂,其分子结构中具有大量的强吸附基团和疏水基团,分子量小,无毒环保且具有良好的热稳定性。抑制作用机理分析表明,抗高温插层吸附抑制剂通过强吸附基团优先进入黏土片层间,交换出层间的水合钠离子,结合静电引力有效减小黏土的静电斥力及表面水化短程斥力;通过改变黏土表面张力和润湿性,控制泥页岩自吸能力和比亲水量,减少水相的侵入;吸附及抗解吸附能力强,能长时间吸附于黏土表面,提升黏土表面的疏水性,减少自由水的侵入。室内评价实验表明,自主研发的抗高温插层吸附抑制剂具有良好的抑制造浆,控制黏土水化膨胀和防止泥页岩崩散等性能,有利水基钻井液的流变性稳定和井壁稳定,具有良好的应用前景。

    Abstract:

    High temperature resistance intercalation adsorption inhibitor has been developed for ?reducing wellbore instability caused by which conventional inhibitors could not controll effectively hydration of clay surface, There are a lot of strong adsorption groups and hydrophobic groups in the molecular structure of the new inhibitor, which was low molecular weight, non-toxic environmental protection and good thermal stability. The analysis of inhibition mechanism showed that, the new inhibitor,the electrostatic repulsion and short-range repulsion of surface hydration of clay can be effectively reduced by the combination of strong adsorption group and exchange of hydrated sodium ions.And by changing the surface tension and wettability of clay, the self-imbibition capacity and specific hydrophilicity of shale can be controlled, and the invasion of water phase can be reduced. Meanwhile.?the new inhibitor had strong adsorption and anti-desorption ability, could adsorb on the clay surface for a long time, improved the hydrophobicity of the clay surface, and reduced the invasion of free water. Laboratory evaluation experiments showed that the new inhibitor had good properties of inhibiting mud production, controlling clay hydration expansion and preventing mud shale collapse, which was beneficial to the stability of rheological property and borehole wall of water-based drilling fluid, it had a good application prospect.

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  • 收稿日期:2022-02-21
  • 最后修改日期:2022-05-18
  • 录用日期:2022-05-18
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