Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 34 for “"Gas hydrate"”.
-
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 …
-
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 …
-
Experimental and computer study of gas hydrate formation and inhibition, An
Includes bibliographical references (pages 128-132).
-
Desalination of Produced Water via Gas Hydrate Formation and Post Treatment
… in which produced water is cleaned by forming gas hydrate in it and subsequently dewatering the hydrate to remove the residual produced water trapped in between the hydrate crystals. All experiments were performed with pressure in the range of 450 to 800psi and temperature in the range of -1 to …
-
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 …
-
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, …
-
Formation and dissociation reaction rates and relevant kinetic behavior of propane gas hydrate (PGH)
… rates and their kinetic behavior of propane gas hydrate (PGH) within the well-defined sediment particle's packing structures were experimentally investigated in this work by using a multi-phase heterogeneous reaction system, consisting of propane gas (g), water (l), PGH (s) and sediment …
-
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, …
-
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 …
-
Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems
… global carbon budget and the fate of greenhouse gases (GHG). Among engineered systems, one promising tool to reduce atmospheric emissions of anthropogenic carbon dioxide (CO₂) is geologic sequestration of CO₂ , which entails the injection of CO₂ into deep geologic formations, like saline …
-
Multi-scale Analysis of Methane Gas Hydrate Formation and Dissociation via Point Source Thermal Stimulation and Carbon Dioxide Exchange
The formation and dissociation of methane gas hydrate was investigated over a range of laboratory scale systems with sample volumes of 1.3 cm3, 0.059 m3 and 0.141 m3. Three unique hydrate apparatuses were used to study a point source thermal dissociation method in which gas production profiles and …
-
Hydrate Formation Using Dowfax Gemini Surfactants
"Gas hydrate formation is a stochastic and slow process. However, the use of a small amount of surfactant can speed up the rate of hydrate formation. This work investigates the effect of two Dow surfactants, Dowfax 2A1 and Dowfax C6L, on gas hydrate formation, first by determining the adsorption …
-
Multiphase flow modeling and deposition of hydrates in oil and gas pipelines
… flow is a ubiquitous feature of oil and gas production and hence, all flow assurance issues involve multiphase flow. The risk of plugging due to gas hydrate formation remains one of the most prevailing flow-assurance problems in deepwater subsea oil and gas operations. Due to the …
-
Equilibrium Conditions of Hydrate-Forming Pickering Emulsions
A key factor in hydrate risk management for an oil-governing system is the stability of the emulsified water with gas hydrate formation. The kinetics of formation of cyclopentane hydrates is investigated in a water-in-oil emulsion using differential scanning calorimetry with the effect of …
-
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 …
-
Pore size distribution and methane equilibrium conditions at Walker Ridge Block 313, northern Gulf of Mexico
… coexistence of three methane phases: liquid (L), gas (G), hydrate (H) in marine gas hydrate systems. A discrete zone of three-phase equilibrium may occur near the base of the gas hydrate stability zone (GHSZ) in sediments with salinity close to seawater due to capillary effects. The existence of a …
-
Gas-generated fractures and methane venting in a deepwater Arctic setting
… the present. During glacial-interglacial cycles, gas venting behavior in shallow water (< 400 m) close to the West Svalbard margin can be explained by gas hydrate dissociation due to pressure reduction caused by lowering of relative sea level or isostatic rebound. However, the process of gas …
-
The comparison of experimental and theoretical hydrate numbers
… for a more 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 …
-
Machine learning applications for core guided petrophysical analysis
… In this thesis, I present two methods for gas hydrate saturation estimation using well log and core data, namely the resistivity method, and the nuclear magnetic resonance (NMR) - density method. Then, I show the discrepancy between the two models to highlight the data quality issues. After …
-
Elastic time-reverse imaging and transmission tomography for microseismic and DAS VSP data
… tomography techniques employed in the oil and gas industry are well-developed under the acoustic assumption. One of the main shortcomings of this assumption is that conventional acoustic imaging algorithms generally use single-component P-wave data and thus do not account for multicomponent …
Page 1 of 2