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Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-10-19 , DOI: 10.1021/acs.energyfuels.1c02252 Siddhant Kumar Prasad 1 , Vishnu Chandrasekharan Nair 1, 2 , Jitendra S. Sangwai 1, 3
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-10-19 , DOI: 10.1021/acs.energyfuels.1c02252 Siddhant Kumar Prasad 1 , Vishnu Chandrasekharan Nair 1, 2 , Jitendra S. Sangwai 1, 3
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Proper understanding of the interaction of individual components of crude oil with hydrate formation and dissociation is essential to design an effective mitigation strategy for hydrate blockage, especially in offshore flowlines. In this study, various isothermal methane hydrate formation and dissociation kinetics experiments have been carried out in oil-in-water dispersion systems to understand the effect of liquid hydrocarbons (such as n-heptane and toluene) and asphaltenes with varying concentrations at 8 MPa and 275.15 K. To correlate the results obtained from the kinetics experiments, solubility tests and interfacial tension measurements have also been carried out. It was observed that aromatic hydrocarbons (e.g., toluene) in the system led to less dissolution of methane gas as compared to alkanes (e.g., n-heptane). This, along with the more developed oil–water interface due to the lower density difference with water, made the system more vulnerable to hydrate formation, and it displayed secondary hydrate induction. The presence of asphaltenes in the oil–water system showed higher gas consumption during hydrate formation at lower concentrations, possibly due to flocculated asphaltene molecules at the oil–water interface acting as nucleation sites for hydrate formation. As the concentration of asphaltene increases, the growth of hydrate crystals is found to be limited, as more asphaltene molecules tend to restrict the gas diffusion toward the water phase, controlling the growth kinetics during hydrate formation. The hydrate dissociation experiments suggest that the presence of flocculated asphaltenes in the system has delayed the dissociation of methane hydrate crystals for some time. The findings of this study will help gain an insight into the interaction of asphaltene, alkanes, and aromatics on the kinetics of methane hydrate formation and dissociation suitable for flow assurance applications.
中文翻译：
沥青质对含轻饱和烃和芳烃的水包油分散体系中甲烷水合物形成和解离动力学的影响
正确理解原油各个组分与水合物形成和解离的相互作用对于设计有效的水合物堵塞缓解策略至关重要，尤其是在海上出油管线中。在这项研究中，在水包油分散体系中进行了各种等温甲烷水合物形成和解离动力学实验，以了解液态烃（如正庚烷和甲苯）和不同浓度的沥青质在 8 MPa 和275.15 K。为了关联从动力学实验中获得的结果，还进行了溶解度测试和界面张力测量。据观察，与烷烃（例如，甲苯）相比，系统中的芳烃（例如甲苯）导致甲烷气体的溶解较少n-庚烷）。由于与水的密度差较小，因此油水界面更加发达，使系统更容易形成水合物，并显示出二次水合物诱导作用。油水体系中沥青质的存在表明，在较低浓度的水合物形成过程中，天然气消耗量较高，这可能是由于油水界面处絮凝的沥青质分子作为水合物形成的成核位点。随着沥青质浓度的增加，发现水合物晶体的生长受到限制，因为更多的沥青质分子倾向于限制气体向水相的扩散，从而控制水合物形成过程中的生长动力学。水合物分解实验表明系统中絮凝沥青质的存在延迟了甲烷水合物晶体的分解一段时间。这项研究的结果将有助于深入了解沥青质、烷烃和芳烃对甲烷水合物形成和分解动力学的相互作用，适用于流动保证应用。
更新日期：2021-11-04
中文翻译：
沥青质对含轻饱和烃和芳烃的水包油分散体系中甲烷水合物形成和解离动力学的影响
正确理解原油各个组分与水合物形成和解离的相互作用对于设计有效的水合物堵塞缓解策略至关重要，尤其是在海上出油管线中。在这项研究中，在水包油分散体系中进行了各种等温甲烷水合物形成和解离动力学实验，以了解液态烃（如正庚烷和甲苯）和不同浓度的沥青质在 8 MPa 和275.15 K。为了关联从动力学实验中获得的结果，还进行了溶解度测试和界面张力测量。据观察，与烷烃（例如，甲苯）相比，系统中的芳烃（例如甲苯）导致甲烷气体的溶解较少n-庚烷）。由于与水的密度差较小，因此油水界面更加发达，使系统更容易形成水合物，并显示出二次水合物诱导作用。油水体系中沥青质的存在表明，在较低浓度的水合物形成过程中，天然气消耗量较高，这可能是由于油水界面处絮凝的沥青质分子作为水合物形成的成核位点。随着沥青质浓度的增加，发现水合物晶体的生长受到限制，因为更多的沥青质分子倾向于限制气体向水相的扩散，从而控制水合物形成过程中的生长动力学。水合物分解实验表明系统中絮凝沥青质的存在延迟了甲烷水合物晶体的分解一段时间。这项研究的结果将有助于深入了解沥青质、烷烃和芳烃对甲烷水合物形成和分解动力学的相互作用，适用于流动保证应用。
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