Thermothickening Drilling Fluids Containing Bentonite and Dual-Functionalized Cellulose Nanocrystals,Energy & Fuels

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Thermothickening Drilling Fluids Containing Bentonite and Dual-Functionalized Cellulose Nanocrystals
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-06-26 , DOI: 10.1021/acs.energyfuels.0c01192
Mei-Chun Li _{1,

2} , Qinglin Wu ₁ , Tingzhou Lei ₃ , Changtong Mei ₂ , Xinwu Xu ₂ , Sunyoung Lee ₄ , Jaegyoung Gwon ₄

Affiliation

The approaching era of sustainable development and rapid increase in global energy demand necessitates the development of high-performance drilling fluids with low toxicity, sustainability, and in-situ rheology controllability for complicated formation excavation. Herein, smart water-based drilling fluids (WDFs) with thermocontrollable rheological properties are developed using bentonite (BT) and dual-functionalized cellulose nanocrystals (fCNCs). The fCNCs are synthesized by surface grafting of poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) and poly(N-isopropylacrylamide) (PNIPAM) through free-radical graft polymerization. The presence of PAMPS grafts with abundant amide and negatively charged sulfonate groups not only enables fCNCs to attach on the surface of BT platelets creating BT/fCNC clusters but also ensures the created BT/fCNC clusters to uniformly disperse through electrostatic repulsion. On the other hand, the introduction of thermoresponsive PNIPAM grafts induces the association of BT/fCNC clusters at elevated temperatures through enhanced hydrophobic attraction, resulting in promising thermothickening rheological performance of BT/fCNC-WDFs. Furthermore, the thermothickening rheological behavior can be maintained even after 10 heating/cooling cycles, albeit with a slight increase in the critical transition temperature. The developed BT/fCNC-WDFs with sustainability, in-situ rheology controllability, and good cyclability have great potential in the smart drilling industry, making the exploration and production of oil and gas more safe, efficient, and environmentally friendly.

中文翻译：

含有膨润土和双功能纤维素纳米晶体的热增稠钻井液

可持续发展和全球能源需求快速增长的时代即将来临，因此需要开发具有低毒性，可持续性和现场流变可控性的高性能钻井液，用于复杂的地层开挖。在本文中，使用膨润土（BT）和双功能化纤维素纳米晶体（fCNC）开发了具有可控流变性的智能水基钻井液（WDF）。fCNC是通过聚（2-丙烯酰胺基-2-甲基-1-丙烷磺酸）（PAMPS）和聚（N-异丙基丙烯酰胺）（PNIPAM）通过自由基接枝聚合。具有丰富酰胺和带负电荷磺酸盐基团的PAMPS接枝物的存在，不仅使fCNC附着在BT血小板表面上，从而形成BT / fCNC簇，而且确保了所创建的BT / fCNC簇通过静电排斥而均匀分散。另一方面，引入热响应性PNIPAM接枝可通过增强的疏水吸引作用在高温下诱导BT / fCNC团簇缔合，从而使BT / fCNC-WDF具有良好的热增稠流变性能。此外，即使临界转变温度略有增加，即使经过10个加热/冷却循环，仍可以保持增稠流变行为。具有可持续性的已开发BT / fCNC-WDF，原位流变可控性和良好的可循环性在智能钻井行业具有巨大的潜力，这使得油气的勘探和生产更加安全，高效和环境友好。

更新日期：2020-07-16

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