Formation of gas hydrates is a problem in the petroleum industry where the gas hydrates can cause blockage of the flowlines. Kinetic hydrate inhibitors (KHIs) are water-soluble polymers, sometimes used in combination synergistically or with nonpolymeric synergists, that are used to prevent gas hydrate blockages. They have been used in the field successfully since 1995. In this paper, we present the first KHI results for the polymer, poly(3-methylene-2-pyrrolidone) (P(3M2P)), which is structurally similar to poly(N-vinylpyrrolidone) (PVP), one of the first KHIs to be discovered. 3M2P polymers with different molecular weights (5500 and 2500 g/mol) and at different concentrations (2500, 5000, and 7500 ppm) were investigated for their KHI performance on structure II hydrates in high-pressure rocking cells. We also investigated the synergistic effect of P(3M2P) with n-butyl glycol ether (BGE), a known synergist for some KHI polymers. At the lower concentrations, P(3M2P) gives a similar performance to PVP (M_w = 8000–9000 g/mol). However, PVP outperforms both samples of P(3M2P) at 7500 ppm, with and without BGE. We suggest that the reasons for the performance level of P(3M2P) are related to greater resonance stabilization of the amide group in P(3M2P) compared to PVP. Also, the pyrrolidone ring of the PVP repeat unit has a larger hydrophobic sequence of three methylene units compared to the two methylene units in the pyrrolidone ring of P(3M2P). This relates well to previous studies where larger hydrophobic groups are preferable in KHI polymers as long as they are water-soluble at hydrate-forming temperatures.

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聚（3-亚甲基-2-吡咯烷酮）作为动力学水合物抑制剂的首次研究

天然气水合物的形成在石油工业中是一个问题，在天然气行业中天然气水合物会导致流路阻塞。动力学水合物抑制剂（KHI）是水溶性聚合物，有时可协同使用或与非聚合增效剂结合使用，以防止气体水合物阻塞。自1995年以来，它们已成功用于该领域。在本文中，我们提出了聚合物（3-亚甲基-2-吡咯烷酮）（P（3M2P））的第一个KHI结果，该结构与聚（N-乙烯基吡咯烷酮（PVP），是最早发现的KHI之一。研究了具有不同分子量（5500和2500 g / mol）和不同浓度（2500、5000和7500 ppm）的3M2P聚合物在高压摇摆池中对结构II水合物的KHI性能。我们还研究了P（3M2P）与正丁基二醇醚（BGE）的协同作用，正丁基二醇醚是某些KHI聚合物的已知协同剂。在较低的浓度下，P（3M2P）的性能与PVP（M _w= 8000–9000 g / mol）。但是，在有和没有BGE的情况下，PVP的性能均优于7500 ppm的P（3M2P）两种样品。我们建议，与PVP相比，P（3M2P）性能水平的原因与P（3M2P）中酰胺基团的更大共振稳定性有关。而且，与P（3M2P）的吡咯烷酮环中的两个亚甲基单元相比，PVP重复单元的吡咯烷酮环具有更大的三个亚甲基单元的疏水序列。这与先前的研究密切相关，在KHI聚合物中，较大的疏水基团在形成水合物的温度下是水溶性的，因此优选较大的疏水基团。