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

• Published in: Energy & Fuels
• Main Authors: Abdallah, Mohamad, Chevalier, Thibaud, Pelerin, Maxime, Sinquin, Anne, Fidel-Dufour, Annie, Lesage, Nicolas, Desmedt, Arnaud
• Other Authors: IFP Energies nouvelles (IFPEN), Institut des Sciences Moléculaires (ISM), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1 (UB)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Total Energies, Centre scientifique et Technique Jean Feger (CSTJF), TOTAL FINA ELF, Laboratoire Léon Brillouin (LLB - UMR 12), Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2024
• Subjects: Additives; Crystals; Hydrate Formation; Hydrocarbons; Solvates; [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]; Methane hydrate
• Online Access: https://ifp.hal.science/hal-04696036; https://ifp.hal.science/hal-04696036/document; https://ifp.hal.science/hal-04696036/file/MorphologyDistributionStructure.pdf; https://ifp.hal.science/hal-04696036/file/Annexe1_MorphologyDistributionStructure.pdf; https://doi.org/10.1021/acs.energyfuels.4c00631

International audience 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.