Dual Functionality of Ultralow Levels of a Model Kinetic Hydrate Inhibitor on Hydrate Particle Morphology and Interparticle Force
Dual Functionality of Ultralow Levels of a Model Kinetic Hydrate Inhibitor on Hydrate Particle Morphology and Interparticle Force
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DOI：
10.1016/j.colsurfa.2022.129825
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
Joshua E. Worley;J. Delgado-Linares;C. Koh
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文献类型：
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作者：
Joshua E. Worley;J. Delgado-Linares;C. Koh
天然气水合物堵塞物的形成是石油和天然气开采工作中的一个主要问题，其中管线堵塞可能会带来重大的安全、经济和环境风险。动力学水合物抑制剂 (KHI) 是一类很有前途的水合物管理化学品，它比传统的热力学水合物抑制剂 (THIs) 更清洁、更便宜、更环保。因此，了解 KHI 对水合物颗粒的影响对其应用至关重要。在这项研究中，我们对超低浓度的 KHI 模型聚乙烯吡咯烷酮 (PVP) 进行了研究，以确定其对水合物性质的影响，并阐明成核和生长抑制何时开始。研究发现，PVP 可以吸附在水合物颗粒表面，使颗粒间力降低 40-54%。低浓度 PVP 在延长接触时间后继续影响颗粒间力，将接触 30 分钟至 1 小时时的力降低 20-40%，并降低烧结速率。 PVP 还会使薄膜生长速率降低 30-50%，具体取决于水相中 PVP 的浓度。据观察，主要成核和生长效应的发生发生在水相中 0.01 wt% PVP 的情况下，比水合物管理中通常采用的浓度低两个数量级。研究发现，低剂量 PVP 可以在短期和长期内引起水合物颗粒的重大形态变化，从而影响颗粒间力和颗粒团聚，并且可以作为 KHI 的形态筛选工具。所提出的观察到的形态变化的机制解释了颗粒表面化学物质的异质吸附如何直接导致新观察到的颗粒形态。本文的结果表明，超低浓度的 KHI（0.0005 wt%）可以对界面活性、晶体生长和水合物形态产生综合影响，表明 KHI 是颗粒间相互作用和水合物生长的双重功能抑制剂。这些结果可以为 KHI 应用提供信息，从工业流量保证到二氧化碳运输，以实现畅通无阻的碳捕获和封存。
Gas hydrate plug formation is a major concern in oil and gas exploitation efforts, wherein line blockages can pose major safety, economic, and environmental risks. Kinetic hydrate inhibitors (KHIs) are a promising class of hydrate management chemicals, which are potentially cleaner, cheaper, and greener than traditional thermodynamic hydrate inhibitors (THIs). Therefore, understanding the effects that KHIs have on hydrate particles is vital to their application. In this study, polyvinylpyrrolidone (PVP), a model KHI, was investigated at ultralow concentrations to determine its effect on the properties of hydrates and elucidate when nucleation and growth inhibition begins. It was found that PVP can adsorb at the hydrate particle surface to reduce interparticle force by 40–54 %. Low concentration PVP continues to affect interparticle forces at prolonged contact times, reducing forces at 30-minutes to 1-hour of contact by 20–40 % and reducing sintering rate. PVP also reduces film growth rates by 30–50 % depending on the concentration of PVP in the water phase. The onset of major nucleation and growth effects was observed to occur at 0.01 wt% PVP in the water phase, two orders of magnitude below concentrations typically employed in hydrate management. It was discovered that low dosage PVP can cause major morphological changes to the hydrate particles in both the short and long term, which can influence interparticle forces and particle agglomeration, and may serve as a morphological screening tool for KHIs. A proposed mechanism for the observed morphology changes explains how the heterogenous adsorption of chemicals at the particle surface can lead directly to the newly observed particle morphology. The results presented in this paper show that ultralow concentrations of KHIs (0.0005 wt%) can have combined effects on the interfacial activity and crystal growth and morphology of hydrates, showing KHIs to be a dual function inhibitor of both interparticle interactions and hydrate growth. These results can inform KHI applications from industrial flow assurance to carbon dioxide transport for unimpeded carbon capture and sequestration.