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Laboratory formation of non-cementing, methane hydrate-bearing sands

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Abstract

Naturally occurring hydrate-bearing sands often behave as though methane hydrate is acting as a load-bearing member of the sediment. Mimicking this behavior in laboratory samples with methane hydrate likely requires forming hydrate from methane dissolved in water. To hasten this formation process, we initially form hydrate in a free-gas-limited system, then form additional hydrate by circulating methane-supersaturated water through the sample. Though the dissolved-phase formation process can theoretically be enhanced by increasing the pore pressure and flow rate and lowering the sample temperature, a more fundamental concern is preventing clogs resulting from inadvertent methane bubble formation in the circulation lines. Clog prevention requires careful temperature control throughout the circulation loop.

Table of Contents

Naturally occurring hydrate-bearing sands often behave as though methane hydrate is acting as a load-bearing member of the sediment. Mimicking this behavior in laboratory samples with methane hydrate likely requires forming hydrate from methane dissolved in water. To hasten this formation process, we initially form hydrate in a free-gas-limited system, then form additional hydrate by circulating methane-supersaturated water through the sample. Though the dissolved-phase formation process can theoretically be enhanced by increasing the pore pressure and flow rate and lowering the sample temperature, a more fundamental concern is preventing clogs resulting from inadvertent methane bubble formation in the circulation lines. Clog prevention requires careful temperature control throughout the circulation loop.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Laboratory formation of non-cementing, methane hydrate-bearing sands
Year Published 2011
Language English
Description 7 p.
Larger Work Type Conference Paper
Larger Work Title Proceedings of the 7th International Conference on Gas Hydrates (ICGH 2011)
Conference Title 7th International Conference on Gas Hydrates (ICGH 2011)
Conference Location Edinburgh, Scotland
Conference Date July 17-21, 2011
Online Only (Y/N) N
Additional Online Files (Y/N) N