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.
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Showing 1 to 20 of 31 for “"free gas"”.
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Experimental and mathematical modeling of foamy-oil evolution and flow in the primary production and CO₂-based cyclic solvent injection
… solvent exsolution (i.e., the solution gas becomes the dispersed gas) and liberation (i.e., the dispersed gas becomes the free gas) processes from the heavy oil-CO2/CH4/C3H8 system in bulk fluids and porous media. Experimentally, two series of constant-composition-expansion (CCE) tests …
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Characterization of Gas-Oil Flow in Cyclic Solvent Injection (CSI) for Heavy Oil Recovery
… use of solvent that maintains a strong nature of gas results in the solvent chamber which under the huff-n-puff operation locates at an inner region towards the well. The CSI process is therefore governed by the gas-oil flow as the solvent chamber is dominated by the free gas-oil flow and the …
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Addressing theory and performance enhancements for the independent sustain and address AC plasma display
… Address (ISA) AC plasma panel is a flat, flicker-free, gas discharge type of display device. This display technology promises to reduce both the cost of manufacturing and operation of AC plasma displays.
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Computational methods for efficient nuclear data management in Monte Carlo neutron transport simulations
… accelerated approach for rejection sampling the free gas resonance elastic scattering kernel that reduces the frequency of zero-temperature elastic scattering cross section data accesses is derived and implemented. Using this new approach, the runtime overhead incurred by an exact treatment of …
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Matter wave optical techniques for probing many-body targets
… in an atom interferometer, in which a free gas acts as a refractive medium for a matter wave. The correlations that develop between the probe and the gas reduce the contrast of the interference pattern that forms when the arms of the interferometer recombine. This is due to the …
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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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Modeling Storage and Flow of Fluids in Shale Reservoirs
Recent development of shale gas reservoirs has led to a revolution in the global energy market. The shale gas industry has expanded rapidly through the application of new drilling and completion technologies, particularly horizontal wells completed in multiple hydraulic fracture stages. While these …
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A monitoring and display system for a cardiopulmonary bypass loop
… cardiopulmonary support. Alarms are issued for free gas in blood, no blood flow, and high oxygenator water temperature. The hardware and software design is described along with schematics and flowcharts. A complete software listing is included. The monitoring and display system is operational, …
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Numerical modeling of methane venting from lake sediments
… level and barometric pressure, appear to trigger free gas bubbling (ebullition). We develop a model of methane bubble ow through the sediments, forced by changes in hydrostatic load. The mechanistic, numerical model is tuned to and compared against ebullition data from Upper Mystic Lake, MA, and …
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Characterizing Supercritical Methane Adsorption on Shale by a Multi-site Model
Shale gas, mainly consisting of adsorbed gas and free gas, has served a critical role of supplying the growing global natural gas demand in the past decades. Considering that the adsorbed methane has contributed up to 80% of the total gas in place (GIP), understanding the methane adsorption …
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Development Of Inlet And Vacuum Ionization Methods For Characterization Of Biological Materials By Mass Spectrometry
… LSII has been utilized together with solvent-free sample preparation and solvent-free gas-phase separation for total solvent-free analysis. </p> <p>The production of multiply charged ions from solid states by vacuum ionization was utilized to encompass the advantages from ESI and …
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A model for backscattering angular response of gassy sediments: Applications to petroleum exploration and development programs
<p>The location and distribution of near-surface gas in continental margins is of particular interest for oil exploration and development programs. The presence of gas seepages can be evidence of the possible existence of subsurface hydrocarbon reservoirs. Gas is also a potential hazard for …
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The Blood Picture in Correlation with Bloat
… especially cattle and sheep. Bloat affects polygastrics, why not monogastrics? Ruminants or polygastrics have a four compartment stomach utilizing protozoa and bacteria similar to a fermentation vat which catabolizes complex substrates into simple digestible nutrients while the monogastrics rely …
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Assessment of the petroleum generation potential of the Neal Shale in the Black Warrior Basin, Alabama
… has a large resource potential, with an adsorbed gas estimate of 460 Tcf and recoverable free gas estimates ranging from 227-4,943 Bcf. Uniaxial strength tests indicate Neal shale samples have an average unconfined axial strength of 3.42 MPa, and the underlying Lewis Limestone samples have an …
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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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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 …
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Enhanced Cyclic Solvent Process (ECSP) for Thin Heavy Oil Reservoirs
… to be greatly reduced in order for the solvent gas drive to occur during which oil regains its high viscosity because a significant amount of solvent gas evolves out of oil. Also, at low-to-intermediate pressures, the methane solubility in the oil is not high. Additionally, continuous free gas …
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Experimental Study of Heavy Oil Recovery Mechanisms during Cyclic Solvent Injection Processes
… after every cycle to analyze the evolution of gas and oil saturations. Three cores were used to study the effect of gravity forces, depletion rate, solvent composition, and initial oil saturation (dead/live oil systems) on the performance of CSI processes. CSI after primary in horizontal …
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Pressure estimation using time-lapse seismic in compacting reservoirs
… drained. The impact of geological structure and gas saturation on the technique is assessed. Strong thickness variations within the reservoir interval increase the errors on the pressure prediction. This is mitigated if relative values instead of absolute values are used to estimate pressure …
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