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- W299950002 abstract "X-RAY COMPUTED-TOMOGRAPHY OBSERVATIONS OF WATER FLOW THROUGH ANISOTROPIC METHANE HYDRATE-BEARING SAND Yongkoo Seol 1 and Timothy J. Kneafsey 2 National Energy Technology Laboratory and 2 Lawrence Berkeley National Laboratory Abstract We used x-ray computed tomography (CT) to image and quantify the effect of a heterogeneous sand grain-size distribution on the formation and dissociation of methane hydrate, as well as the effect on water flow through the heterogeneous hydrate-bearing sand. A 28 cm long sand column was packed with several segments having vertical and horizontal layers with sands of different grain-size distributions. During the hydrate formation, water redistribution occurred. Observations of water flow through the hydrate- bearing sands showed that water was imbibed more readily into the fine sand, and that higher hydrate saturation increased water imbibition in the coarse sand due to increased capillary strength. Hydrate dissociation induced by depressurization resulted in different flow patterns with the different grain sizes and hydrate saturations, but the relationships between dissociation rates and the grain sizes could not be identified using the CT images. The formation, presence, and dissociation of hydrate in the pore space dramatically impacts water saturation and flow in the system. Keywords: methane hydrate, anisotropy, x-ray computed tomography, capillary strength INTRODUCTION Methane hydrate is an ice-like crystalline solid that typically forms from methane and water at high pressures and low temperatures. It can be found at and below the ocean floor and in deposits underlying permafrost where the thermodynamic conditions are compatible with hydrate stability (Sloan, 1998). Hydrates have recently attracted attention as a possible energy resource (e.g., Makogon 1987; Gornitz and Fung, 1994;" @default.
- W299950002 created "2016-06-24" @default.
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- W299950002 date "2010-03-30" @default.
- W299950002 modified "2023-09-24" @default.
- W299950002 title "X-ray computed-tomography observations of water flow through anisotropic methane hydrate-bearing sand" @default.
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