Methane hydrate formation and dissociation in a partially saturated core-scale sand sample

Journal Article · Thu Mar 01 04:00:00 EST 2007 · Journal of Petroleum Science and Engineering

DOI:https://doi.org/10.1016/j.petrol.2006.02.002· OSTI ID:913014

Kneafsey, T J ^[1]; Tomutsa, L ^[1]; Moridis, G J ^[1]; Seol, Y ^[1]; Freifeld, B M ^[1]; Taylor, C E; Gupta, A ^[2]

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1. LBNL
2. Colorado School of Mines, Golden, CO

We performed a series of experiments to provide data for validating numerical models of gas hydrate behavior in porous media. Methane hydrate was formed and dissociated under various conditions in a large X-ray transparent pressure vessel, while pressure and temperature were monitored. In addition, X-ray computed tomography (CT) was used to determine local density changes during the experiment. The goals of the experiments were to observe changes occurring due to hydrate formation and dissociation, and to collect data to evaluate the importance of hydrate dissociation kinetics in porous media. In the series of experiments, we performed thermal perturbations on the sand/water/gas system, formed methane hydrate, performed thermal perturbations on the sand/hydrate/water/gas system resulting in hydrate formation and dissociation, formed hydrate in the resulting partially dissociated system, and dissociated the hydrate by depressurization coupled with thermal stimulation. Our CT work shows significant water migration in addition to possible shifting of mineral grains in response to hydrate formation and dissociation. The extensive data including pressure, temperatures at multiple locations, and density from CT data is described.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA; National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV
• Sponsoring Organization: USDOE
• OSTI ID: 913014
• Report Number(s): DOE/NETL-IR-2007-087
• Journal Information: Journal of Petroleum Science and Engineering, Journal Name: Journal of Petroleum Science and Engineering Journal Issue: 1-3 Vol. 56; ISSN 0920-4105
• Publisher: Elsevier B.V.
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
Depressurization
Dissociation
Hydrate formation
Porous medium
Thermal stimulation
X-ray computed tomography