溶剂增效剂改善聚（N-乙烯基己内酰胺）基动力学水合物抑制剂性能的进一步研究,Energy & Fuels

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溶剂增效剂改善聚（N-乙烯基己内酰胺）基动力学水合物抑制剂性能的进一步研究
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-11-29 , DOI: 10.1021/acs.energyfuels.1c03567
Erik G. Dirdal ₁ , Malcolm A. Kelland ₁

Affiliation

聚( N-乙烯基己内酰胺) (PVCap) 和相关共聚物已被用作动力水合物抑制剂 (KHI)，以防止油气田生产流水线中的天然气水合物形成。众所周知，将某些溶剂添加到 KHI 聚合物中可以增强其阻碍气体水合物形成的能力。在早期的一项研究中，研究了多种醇类、乙二醇醚和酮类作为与 PVCap 的协同溶剂。在该研究中，4-甲基-1-戊醇 (iHexOl) 实现了出色的协同作用。本报告以该研究为基础，通过更详细地研究 iHexOl 以及第一项研究预测具有良好协同作用的一些新合成溶剂。缓慢恒定冷却 (SCC) 和等温 KHI 实验均在高压钢摇摆室中使用形成结构 II 的天然气混合物进行。研究了 KHI 聚合物浓度、溶剂浓度和混合溶剂系统。溶剂增效剂的水溶性（也在盐水中）和分配到液态烃相被证明是优化 KHI 性能的重要因素。此外，观察到 KHI 聚合物与溶剂增效剂一起使用时的最佳分子量分布与单独使用聚合物时的最佳分布不同。

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Further Investigation of Solvent Synergists for Improved Performance of Poly(N-vinylcaprolactam)-Based Kinetic Hydrate Inhibitors

Poly(N-vinylcaprolactam) (PVCap) and related copolymers have been used as kinetic hydrate inhibitors (KHIs) to combat gas hydrate formation in oil and gas field production flow lines. It is known that the addition of certain solvents to the KHI polymer can enhance its ability to hinder gas hydrate formation. In an earlier study, a wide range of alcohols, glycol ethers, and ketones were investigated as synergetic solvents with PVCap. In that study, an outstanding synergetic effect was achieved by 4-methyl-1-pentanol (iHexOl). This report builds on that study by investigating iHexOl in more detail as well as some newly synthesized solvents predicted by the first study to have good synergism. Both slow constant cooling (SCC) and isothermal KHI experiments were conducted in high-pressure steel rocking cells using a structure II-forming natural gas mixture. The KHI polymer concentration, solvent concentration, and mixed solvent systems were investigated. The solvent synergist water solubility, also in brines, and partitioning to the liquid hydrocarbon phase are shown to be important factors to consider for optimizing KHI performance. Further, it was observed that the optimal molecular weight distribution for the KHI polymer when used with a solvent synergist is not the same as the optimum distribution when using the polymer alone.

更新日期：2021-12-16

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