A Numerical Study on Gas Production From Formations Containing Gas Hydrates
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Résumé
Abstract Gas hydrates as a significant resource of natural gas have attracted considerable attention in the recent years. However, the severe environmental conditions of gas hydrate reservoirs and the solid form of hydrates require extensive technological development and expertise before commercial gas production becomes possible. Numerical studies often give useful information in predicting the potential and economic viability of a recovery process. This paper presents a 2-D cylindrical simulator for gas production from hydrate reservoirs. The model includes the equations of gas-water two-phase flow, conductive and convective heat transfer, and intrinsic kinetics of hydrate decomposition. The simulator is used to model a hydrate reservoir where the hydrate-bearing layer overlies a free gas zone. A well is drilled and completed in the free gas zone. Pressure reduction in the free gas zone leads to the decomposition of the overlying hydrate and subsequent production of the generated gas. In this paper we investigate the effect of various parameters on gas production behavior. In particular, these parameters relate to formation properties, operating conditions, kinetic parameters etc. The cumulative gas generated and produced, pressure, temperature and saturation distributions are studied for the different conditions. The potential of gas production from formations containing gas hydrates is analyzed using the results of the sensitivity study. Introduction Today, increasingly more stringent environmental considerations require that clean sources of energy be found. It is, therefore, anticipated that the demand for natural gas will continue to increase significantly. The gas hydrates, which are made of water and natural gas (mainly methane) and exist in enormous quantity, are being considered as a potential source for natural gas production. However, the technologies for recovering natural gas from hydrates are very challenging, and are still under development. Sloan[1] has presented an extensive review of some suggested methods including depressurization, thermal stimulation and inhibitor injection. The least energy intensive process is thought to be the depressurization method, since in this method the heat of decomposition is provided by the surrounding formation. Modeling of gas production from hydrate reservoirs involves solving the coupled equations of mass and energy balance. A review of analytical[2–6] and numerical[7–14] models suggests that two approaches with respect to conditions at the decomposition zone have been taken: equilibrium and non-equilibrium. In the equilibrium models, the three-phase hydrate-gas-water interface is at equilibrium. The underlying assumption in these models is that the intrinsic rate of hydrate dissociation does not control the process, and the overall rate of hydrate dissociation is controlled by other factors such as fluid flow or heat transfer. In non-equilibrium models however, the hydrate-gas-water interface is not at equilibrium. In this work we will study if the intrinsic kinetics of hydrate dissociation affects the overall gas production and investigate if the equilibrium models are sufficient. For this purpose we employed the Kim-Bishnoi[15] kinetics model combined with the mass and energy equations to study the methane hydrate decomposition by the depressurization scheme.
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| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,008 | 0,001 |
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