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Showing 1 to 20 of 27 for “"gas hydrates"”.
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Modeling of gas hydrates from first principles
… surface (PES) accurately for use in modeling gas hydrates. Electron correlation was found to be treated accurately by the second-order Moller-Plesset method (MP2). However, a large basis set, cc-pVQZ, was found to be necessary in order to compute the binding energies to within 0.1 kcal/mol of …
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Probing Nucleation Mechanisms of Gas Hydrates via Molecular Simulations
Gas hydrates are ice-like solids where guest species can be encapsulated in water cages. Gas hydrates have received considerable attention because of the vast natural methane hydrates and various promising hydrate-based technologies. Relevant to the applications, a fundamental molecular-level …
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Vapor-solid equilibrium ratios for structure I natural gas hydrates
Includes bibliographical references.
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Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions
Methane hydrates are globally distributed in sediments along the continental margins and potentially contain more energy than all fossil fuel reserves. However, methane is also a potential greenhouse gas which could play a major role in global climate change. Understanding the stability of gas …
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The inclusivity of ice.
… In Chapter Five, the ideal concentration of gas hydrate formation was studied through the analysis of melted gas hydrates and compared to the concentrated bath solutions with vibrational spectroscopy, namely attenuated total reflection spectroscopy. Additionally, interfacial interactions for …
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Phase equilibrium study of methane hydrate
Gas hydrates are solid metastable ice like compounds formed when gas comes in contact with water and have the ability to form at low temperatures. In this study, methane gas hydrates were formed in a Berea sandstone core, which was saturated with brine and then pressurized with methane gas. The …
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Implications for gas hydrate occurrence : 3D thermobaric modelling of central Spitsbergen
Gas hydrates have traditionally been viewed as hazardous to petroleum operations, particularly with respect to flow assurance in pipelines and slope stability. They occur where gas migrates through environments characterised by moderate pressures and low temperatures. Gas hydrates thus naturally …
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Well engineering concepts to make methane gas hydrate exploitation affordable.
… global deposits of land and seabed methane gas hydrates. The volume of methane gas trapped in these methane gas hydrates is calculated to be at least twice the volume of current global reserves of oil & gas as reviewed by the United Nations. These methane gas hydrates are deemed important as …
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Investigation into potential gas hydrate and gas zones off the South African coastline
Gas and petroleum products are important to modern life and, as peak oil is reached, the search is on for alternative fuel sources. A natural gas hydrate, also known as a clathrate, is formed when a gas molecule (such as methane) is trapped in a lattice of ice. Once considered oilfield nuisances, …
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Sediment Heterogeneity and Sand Production in Gas Hydrate Extraction: Daini-Atsumi Knoll, Nankai Trough, Japan
The possibility of commercial natural gas production from gas hydrates has been tested by researchers and industry for more than ten years. Depressurisation of gas hydrates in porous and permeable sandstones has successfully produced water and natural gas. However long term sustainable production …
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Interfacial properties of CH₄/C₂H₆ gas hydrate particles with chemical additives
Gas hydrates are ice-like solid compounds comprised of interconnected cages of water molecules, which can encapsulate guest (gas) molecules. Gas hydrates can form in subsea oil and gas flowlines operating at high pressures and low temperatures, which are the conditions that gas hydrates are …
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EXPERIMENTAL INVESTIGATION OF HYDRAULIC FRACTURING IN A PENNY-SHAPED CRACKED FOR FROZEN SAND AND HYDRATE-BEARING SAND USING UN-PROPPED AND NON-VISCOUS LIQUID
… hydrate is dissociated to produce methane gas. Hydrates are only stable under high pressure and low temperature. This study draws the motivation to improve the surface area for hydrate to dissociate by creating artificial fracture. Hence, this work examines the susceptibility of …
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Methane Gas Hydrate Morphology and its Effect on the Stiffness and Damping of some Sediments
Gas hydrates are ice–like compounds found in deep sea sediments and permafrosts. Concise detection<br/>and quantification of natural methane gas hydrate deposits, will allow for a more robust assessment<br/>of gas hydrate as a potential energy resource or natural geohazard. Current seismic methods, …
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Review of H2S abatement in geothermal plants and laboratory scale design of tray plate distillation tower
… In particular, dissolved non-condensable gases (NCG) such as CO2 and H2S within geothermal fluids have led to increased interest in developing methods for decreasing these emissions through abatement systems or even potentially using these gases to generate value for use in industrial …
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The biogeochemistry of methane isotopologues in marine and lacustrine sediments
Methane is a globally significant greenhouse gas, energy resource, and it is a product and reactant of microbial metabolisms. Multiple sources and sinks of methane can be challenging to distinguish from each other, thus complicating the understanding of methane budgets and the effects of microbes …
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The Biogeochemistry of Methane Isotopologues in Marine and Lacustrine Sediments
Methane is a globally significant greenhouse gas, energy resource, and it is a product and reactant of microbial metabolisms. Multiple sources and sinks of methane can be challenging to distinguish from each other, thus complicating the understanding of methane budgets and the effects of microbes …
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The comparison of experimental and theoretical hydrate numbers
… precise determination of the hydrate numbers of gas hydrates were developed. Hydrate numbers (the ratio of the moles of water to moles of gas in the gas hydrate) were determined for pure component ethane and methane hydrates at several equilibrium decomposition conditions and compared with …
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