The Experimental and Numerical Studies on Gas Production from Hydrate Reservoir by Depressurization
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A set of experimental system to study hydrate dissociation in porous media is built and some experiments on hydrate dissociation by depressurization are carried out. A mathematical model is developed to simulate the hydrate dissociation by depressurization in hydrate-bearing porous media. The model can be used to analyze the effects of the flow of multiphase fluids, the kinetic process and endothermic process of hydrate dissociation, ice-water phase equilibrium, the variation of permeability, convection and conduction on the hydrate dissociation, and gas and water productions. The numerical results agree well with the experimental results, which validate our mathematical model. For a 3-D hydrate reservoir of Class 3, the evolutions of pressure, temperature, and saturations are elucidated and the effects of some main parameters on gas and water rates are analyzed. Numerical results show that gas can be produced effectively from hydrate reservoir in the first stage of depressurization. Then, methods such as thermal stimulation or inhibitor injection should be considered due to the energy deficiency of formation energy. The numerical results for 3-D hydrate reservoir of Class 1 show that the overlying gas hydrate zone can apparently enhance gas rate and prolong life span of gas reservoir.
KeywordsDepressurization Gas hydrate reservoir Numerical simulation Experimental study
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- Bai Y.H., Li Q.P., Yu X.C., Feng G.Z.: Numerical study on the dissociation of gas hydrate and its sensitivity to physical parameters. China Ocean. Eng. 21(4), 625–636 (2007)Google Scholar
- Burshears M., Obrien T.J., Malone R.D.: A multi-phase, multi-dimensional, variable composition simulation of gas production from a conventional gas reservoir in contact with hydrates. SPE 15246, 449–453 (1986)Google Scholar
- Holder G.D., Patrick F.A.: Simulation of gas production from a reservoir containing both gas hydrate and free natural gas. SPE 11105, 1–4 (1982)Google Scholar
- Kamath, V.: Study of heat transfer characteristics during dissociation of gas hydrate in porous media. Ph.D thesis, University of pittsburgh, Pittsburgh (1983)Google Scholar
- Lake L.W.: Enhanced Oil Recovery. Prentice-Hall Inc., Upper Saddle River, NJ (1989)Google Scholar
- Makogon Y.F.: Hydrate of Hydrocarbons. PennWell Publishing Co., Tulsa, Oklahomac (1997)Google Scholar
- Moridis G.J.: Numerical studies of gas production from methane hydrates. SPE 87330, 1–11 (2002)Google Scholar
- Moridis, G.J., Timothy, S.C.: Strategies for gas production from hydrate accumulations under various geological and reservoir conditions. Proceedings, TOUGH Symposium 2003, Lawrence Berkeley National Laboratory, Berkeley, California, May 12–14 (2003)Google Scholar
- Sloan E.D.: Clathrate hydrates of natural gases, Second edition. Marcel Deckker Inc., New York (1998)Google Scholar
- Wu, S.G., Yao, B.C.: Geologic structure and resource evaluation of gas hydrate. Beijing: Science Press (2008). (in Chinese)Google Scholar
- Yousif M.H., Abass H.H., Selim M.S., Sloan E.D.: Experimental and theoretical investigation of methane-gas-hydrate dissociation in porous media. SPE 18320, 69–76 (1991)Google Scholar