Methane Hydrate Formation and Dissociation in a Partially Saturated Sand--Measurements and Observations.

Taylor, C. E. ; Gupta, A. ; Kneasfsey, T. J. ; Tomutsa, L. ; Moridis, G. J.

Technical Information Center Oak Ridge Tennessee

关键词: Methane hydrates;    Hydrate dissociation;    Measurements;    Tests;    Computerized tomography;   

RP-ID  :  DE2005842697

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We performed a sequence of tests on a partially water-saturated sand sample contained in an x-ray-transparent aluminum pressure vessel that is conducive to x-ray computed tomography (CT) observation. These tests were performed to gather data for estimation of thermal properties of the sand/water/gas system and the sand/hydrate/water/gas systems, as well as data to evaluate the kinetic nature of hydrate dissociation. The tests included mild thermal perturbations for the estimation of the thermal properties of the sand/water/gas system, hydrate formation, thermal perturbations with hydrate in the stability zone, hydrate dissociation through thermal stimulation, additional hydrate formation, and hydrate dissociation through depressurization with thermal stimulation. Density changes throughout the sample were observed as a result of hydrate formation and dissociation, and these processes induced capillary pressure changes that altered local water saturation.