INFLUENCE OF WATER THERMAL HISTORY AND OVERPRESSURE ON CO2-HYDRATE NUCLEATION AND MORPHOLOGY
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dc.contributor.author | Zatsepina O.Y. | |
dc.contributor.author | Riestenberg D. | |
dc.contributor.author | McCallum S.D. | |
dc.contributor.author | Gborigi M. | |
dc.contributor.author | Brandt C. | |
dc.contributor.author | Phelps T.J. | |
dc.contributor.author | Buffett B.A. | |
dc.date.accessioned | 2022-07-11T05:35:37Z | |
dc.date.available | 2022-07-11T05:35:37Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=31485835 | |
dc.identifier.citation | American Mineralogist, 2004, 89, 8-9, 1254-1259 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38103 | |
dc.description.abstract | The onset of gas hydrate nucleation is greatly affected by the thermal history of the water that forms its lattice structure. Hydrate formation experiments were performed in a 72 L pressure vessel by injecting bubbles of carbon dioxide through a 1 L tube at hydrate formation pressures (1.4 to 3.7 MPa) and temperatures (2 to 5 °C). The results revealed that when even a small fraction (e.g., 5-35%) of the water in which the hydrate formed was recently thawed the overpressure for nucleation was reduced by an average of 50% as compared to untreated distilled water. This observation was confirmed by an analysis of variance (ANOVA) test that indicated that recently thawed water required a significantly lower overpressure compared to the untreated distilled water. In experiments where hydrate nucleated at low overpressure (e.g., 0.75 MPa), hydrate formed at the vapor-liquid interface, encrusting the bubbles with less than 1 g of hydrate accumulation in the first minute. When a higher overpressure was required for nucleation (e.g., 1.3 MPa), hydrate was observed to form abruptly not only on bubbles but also from the bulk liquid phase, typically accumulating a mass of more than 100g in the first few seconds. Our results show that initiation of hydrate formation is strongly influenced by temperature-dependent pre-structuring of water molecules prior to their contact with gas. Although as little as a 5% volume fraction of pre-structured water may decrease the required overpressure, once hydrate formation commences the mass of hydrate accumulation is dependent on the overpressure. | |
dc.title | INFLUENCE OF WATER THERMAL HISTORY AND OVERPRESSURE ON CO2-HYDRATE NUCLEATION AND MORPHOLOGY | |
dc.type | Статья |
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