PRELIMINARY CHARACTERIZATION OF CO2 SEPARATION AND STORAGE PROPERTIES OF COAL GAS RESERVOIRS [electronic resource].
- Tucson, Ariz. : University of Arizona, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 25 pages : digital, PDF file
- Additional Creators:
- University of Arizona
United States. Department of Energy. Office of Scientific and Technical Information
- An attractive alternative of sequestering CO₂ is to inject it into coalbed methane reservoirs, particularly since it has been shown to enhance the production of methane during near depletion stages. The basis for enhanced coalbed methane recovery and simultaneous sequestration of carbon dioxide in deep coals is the preferential sorption property of coal, with its affinity for carbon dioxide being significantly higher than that for methane. Yet, the sorption behavior of coal under competitive sorptive environment is not fully understood. Hence, the original objective of this research study was to carry out a laboratory study to investigate the effect of studying the sorption behavior of coal in the presence of multiple gases, primarily methane, CO₂ and nitrogen, in order to understand the mechanisms involved in displacement of methane and its movement in coal. This had to be modified slightly since the PVT property of gas mixtures is still not well understood, and any laboratory work in the area of sorption of gases requires a definite equation of state to calculate the volumes of different gases in free and adsorbed forms. This research study started with establishing gas adsorption isotherms for pure methane and CO₂. The standard gas expansion technique based on volumetric analysis was used for the experimental work with the additional feature of incorporating a gas chromatograph for analysis of gas composition. The results were analyzed first using the Langmuir theory. As expected, the Langmuir analysis indicated that CO₂ is more than three times as sorptive as methane. This was followed by carrying out a partial desorption isotherm for methane, and then injecting CO₂ to displace methane. The results indicated that CO₂ injection at low pressure displaced all of the sorbed methane, even when the total pressure continued to be high. However, the displacement appeared to be occurring due to a combination of the preferential sorption property of coal and reduction in the partial pressure of methane. As a final step, the Extended Langmuir (EL) model was used to model the coal-methane-CO₂ binary adsorption system. The EL model was found to be very accurate in predicting adsorption of CO₂, but not so in predicting desorption of methane. The selectivity of CO₂ over methane was calculated to be 4.3:1. This is, of course, not in very good agreement with the measured values which showed the ratio to be 3.5:1. However, the measured results are in good agreement with the field observation at one of the CO₂ injection sites. Based on the findings of this study, it was concluded that low pressure injection of CO₂ can be fairly effective in displacing methane in coalbed reservoirs although this might be difficult to achieve in field conditions. Furthermore, the displacement of methane appears to be not only due to the preferential sorption of methane, but reduction in partial pressure as well. Hence, using a highly adsorbing gas, such as CO₂, has the advantages of inert gas stripping and non-mixing since the injected gas does not mix with the recovered methane.
- Published through SciTech Connect.
Satya Harpalani; John Kemeny.
- Type of Report and Period Covered Note:
- Final; 03/01/2004 - 03/01/2004
- Funding Information:
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