Morphology and Distribution Structure Characterization of Methane Hydrate Formed in the Presence of Amphiphilic Antiagglomerant Additive - Université de Bordeaux
Article Dans Une Revue Energy & Fuels Année : 2024

Morphology and Distribution Structure Characterization of Methane Hydrate Formed in the Presence of Amphiphilic Antiagglomerant Additive

Résumé

We investigate the impact of commercial amphiphilic anti-agglomerant additive (AA) on hydrate crystals morphology, size and dispersion in organic phases, by using optical imaging and Raman spectroscopy. To better reproduce the conditions during oil and gas offshore production, methane hydrates were formed from saline water (5 g/L NaCl) in the presence of AA additive at various concentrations (aqueous solutions of 5 and 7 % wt), by using Ketrul211® condensate phase (corresponding to a petroleum cut of C12-C14 carbon distribution), under a constant subcooling of 8.5 ± 0.5 K and 70 bar. Two systems have been studied: water-AA/methane and water-AA/ketrul211®/methane. By optical imaging observation, the presence of AA additives leads to polygonal periodic crystals (with size ranging from ca. 1 to 10 µm) for the water-AA/methane system, and perpendicular needle crystals (with size close to 10 µm) for the water-AA/ketrul211®/methane system. In the absence of AA additive, no polygonal or needle crystals morphology has been observed. With the help of Raman imaging, the methane hydrate distribution has been investigated at a micrometer scale: the formation of methane hydrates aggregates is revealed inside the ketrul211® bulk phase matrix.
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Dates et versions

hal-04696036 , version 1 (12-09-2024)

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Mohamad Abdallah, Thibaud Chevalier, Maxime Pelerin, Anne Sinquin, Annie Fidel-Dufour, et al.. Morphology and Distribution Structure Characterization of Methane Hydrate Formed in the Presence of Amphiphilic Antiagglomerant Additive. Energy & Fuels, 2024, 38 (11), pp.9414-9424. ⟨10.1021/acs.energyfuels.4c00631⟩. ⟨hal-04696036⟩
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