Kinetic studies on the viability to recover natural gas and capture co2 using naturally-occurring gas hydrates deposits
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2011
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Abstract
Increasing generation of greenhouse gases (CU2,N OR)f rom the combustion of fossil fuels has created a world-wide concern over climate change. This fact has stimulated research on the use of gas hydrates deposits as a possible mean to reduce the CO2 emissions to the atmosphere. In this study, CH4-0O2 mixed gas hydrate formation kinetics were investigated using Raman spectroscopy and Powder X-ray diffraction at temperatures below 273K; these data were well represented by the model of Avrami (1939, 1940, 1941). In addition, the intrinsic rate of formation and decomposition of gas hydrates formed from methane, carbon dioxide and their mixtures was studied using an isothermal-isobaric semibatch stirred tank reactor coupled with a Focus Beam Reflectance Measurement (FBRM) probe to obtain information on the gas hydrates formation and decomposition kinetics when the temperatures were above 273K. A methodology adopted from the literature was used to determine the particle size distribution of the gas hydrates, which particles are now considered as oblate spheroids rather than perfect spheres. New mathematical models to predict the rate of growth and decomposition of mixed hydrates are proposed; these new models extend the kinetic theory of Englezos ( 1987b) and Clarke and Bishnoi (2000) to account for some of the non-idealities not considered in the original models. The predictions of these new alternatives were found to closely match the experimental data. As an application of these intrinsic kinetics studies that were conducted in this research, a natural gas recovery simulation was carried out using STARSTM to model the CH4-hydrate decomposition in a reservoir using the depressurization method. Its results were investigated using a statistical sensitivity analysis (full factorial design-ANOVA). The results showed that the main variable that affects the CH4 production from gas hydrates reservoirs is the absolute permeability of the system.
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Bibliography: p. 199-217
Many pages are in colour.
Many pages are in colour.
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Giraldo, C. (2011). Kinetic studies on the viability to recover natural gas and capture co2 using naturally-occurring gas hydrates deposits (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/4647