Thermal Property Measurements of Methane Hydrate Using a Transient Plane Source Technique
Robert P. Warzinski, Eilis J. Rosenbaum, Ronald J. Lynn, David W. Shaw, 2009. "Thermal Property Measurements of Methane Hydrate Using a Transient Plane Source Technique", Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards, T. Collett, A. Johnson, C. Knapp, R. Boswell
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Knowledge of the thermal properties of gas hydrates and sediments containing gas hydrates is essential for assessing their commercial potential for natural gas recovery and their possible factors in sea-floor stability and climate change. Unlike phase equilibrium properties of hydrates, little information is available on their thermal properties. A major experimental challenge in thermal property measurement is determining the composition of the sample being measured. This chapter describes work being performed at the National Energy Technology Laboratory to develop a means to reliably measure the thermal properties of hydrate and hydrate-containing samples, while facilitating characterization of the sample with minimal decomposition or disturbance. A transient plane source (TPS) technique for simultaneously determining thermal conductivity and thermal diffusivity has been adapted for use at high pressure for this purpose. The TPS element is mounted inside a specially designed cup assembly that not only holds and contains the sample, but can also serve as a sample compaction device. The cup assembly is contained inside a high-pressure vessel that not only facilitates measurements at in-situ conditions, but can also be used to form hydrate or hydrate-containing samples in contact with the TPS element. The part of the cup containing the TPS element can simply be pulled away from the hydrate sample to permit subsequent characterization of the part of the sample that was measured. The formation of uncompacted methane hydrate in the cup and measurement of its thermal properties are described. The recovery of the sample and characterization by Raman spectroscopy are also presented.
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Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards
In September 2004, the American Association of Petroleum Geologists (AAPG) convened a Hedberg Research Conference in Vancouver, British Columbia, Canada titled "Natural Gas Hydrates: Energy Resource Potential and Associated Geologic Hazards." As a continuation of the Hedberg Research Conference in Vancouver, the conveners of the conference and the editors of this Memoir have worked with more than 150 authors and coauthors to prepare this Memoir on gas hydrates. This publication follows the goals of the Hedberg conference; however, the contents of this Memoir were expanded to include all aspects of gas hydrates in nature. This Memoir contains 39 individual contributions, ranging from long topical summaries to shorter focused research papers. This Memoir has been published in two parts, with digital versions of all the complete research papers included on the enclosed CD. The hardcopy portion of the Memoir includes abstracts and several key figures for each of the contributions along with a complete copy of a gas hydrate technical review. The digital portion of this Memoir has been organized into a series of topical sections consisting of review articles, marine gas hydrate papers, and gas hydrate laboratory and modeling studies. Because of the rapidly emerging worldwide interest in gas hydrates, this comprehensive treatise on the geology of gas hydrates will be valuable to both the gas hydrate research community and exploration/development geologists working in arctic and deep marine environments.