[NVim]Br and Poly([NVim]Br-Co-AM): Synthesis and Effects on Inhibiting Clay Swelling and Dispersion and the Mechanisms

IF 2.5 4区 化学 Q3 POLYMER SCIENCE
Lan Li, Yanjun Ren, Rugang Yao, Hong Yang
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Abstract

To solve the downhole problems correlated with clay hydration swelling and dispersion under high-temperature conditions, a 1-aminoethyl-3-vinylimidazolium bromide ([NVim]Br) and a [NVim]Br/acrylamide copolymer (poly([NVim]Br-co-AM)) are synthesized and used as inhibitors. The molecular structures of [NVim]Br and poly([NVim]Br-co-AM) are characterized by FT-IR and 1H-NMR. The inhibition properties of [NVim]Br and poly([NVim]Br-co-AM) are evaluated by free swelling and dispersion tests, linear swelling, hot roll recovery experiments and thermogravimetric analyses.The inhibition mechanisms were revealed by X-ray diffraction, zeta potential, wettability analysis and ESEM observation. The results showed that both [NVim]Br and poly([NVim]Br-co-AM) has significantly superior inhibition performance compared with the common inhibitors KCl, polyether amine D230 and polyquaternium-7. Both [NVim]Br and poly([NVim]Br-co-AM) can resist 250 °C. [NVim]Br performed excellently in inihibiting both crystalline and osmotic swelling, which depended on the strong electrostatic adsorption and hydrogen bonds of imidazole cations and primary amine in [NVim]+. Poly([NVim]Br-co-AM) exerted excellent inhibition by minimizing osmotic swelling, reducing hydrophilicity and increasing clay bonding. The results are important for understanding the rational design of novel efficient inhibitors for drilling high-temperature shale formation.

Abstract Image

[NVim]Br 和 Poly([NVim]Br-Co-AM):合成、对抑制粘土膨胀和分散的作用及其机理
为了解决高温条件下与粘土水化膨胀和分散相关的井下问题,合成了 1-氨基乙基-3-乙烯基咪唑溴化物([NVim]Br)和[NVim]Br/丙烯酰胺共聚物(poly([NVim]Br-co-AM)),并将其用作抑制剂。傅立叶变换红外光谱和 1H-NMR 对 [NVim]Br 和 poly([NVim]Br-co-AM) 的分子结构进行了表征。通过 X 射线衍射、ZETA 电位、润湿性分析和 ESEM 观察揭示了[NVim]Br 和 poly([NVim]Br-co-AM) 的抑制机理。结果表明,与常见的抑制剂 KCl、聚醚胺 D230 和聚季铵盐-7 相比,[NVim]Br 和聚([NVim]Br-co-AM)的抑制性能明显优于它们。[NVim]Br和聚([NVim]Br-co-AM)都能耐受 250 °C。[NVim]Br在抑制结晶膨胀和渗透膨胀方面表现出色,这取决于[NVim]+中咪唑阳离子和伯胺的强静电吸附和氢键。聚([NVim]Br-co-AM)通过最大限度地减少渗透膨胀、降低亲水性和增加粘土键来发挥出色的抑制作用。这些结果对于合理设计用于钻探高温页岩层的新型高效抑制剂具有重要意义。
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来源期刊
Macromolecular Chemistry and Physics
Macromolecular Chemistry and Physics 化学-高分子科学
CiteScore
4.30
自引率
4.00%
发文量
278
审稿时长
1.4 months
期刊介绍: Macromolecular Chemistry and Physics publishes in all areas of polymer science - from chemistry, physical chemistry, and physics of polymers to polymers in materials science. Beside an attractive mixture of high-quality Full Papers, Trends, and Highlights, the journal offers a unique article type dedicated to young scientists – Talent.
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