Abstract
The paper presents a research study on modeling and computer simulation of injecting CO2 into the coal seams of the Upper Silesian Coal Basin, Poland connected with enhanced coal bed methane (ECBM) recovery. In the initial stage of the research activities, a structural parameter model was developed specifically with reference to the coal-bearing formations of the Upper Carboniferous for which basic parameters of coal quality and the distribution of methane content were estimated. In addition, a lithological model of the overall reservoir structure was developed and the reservoir parameters of the storage site were analyzed. In the next stage of the research, the static model was supplemented with detailed reservoir parameters as well as the thermodynamic properties of fluids and complex gases. The paper discusses a series of simulations of an enhanced coalbed methane recovery process with a simultaneous injection of carbon dioxide. The analyses were performed using the ECLIPSE software designed for simulating coal seam processes. The results of the simulations demonstrated that the total volume of CO2 injected to a designated seam in a coal mine during the period of one year equaled 1,954,213 sm3. The total amount of water obtained from the production wells during the whole period of the simulations (6.5 years) was 9867 sm3. At the same time, 15,558,906 sm3 of gas was recovered, out of which 14,445,424 sm3 was methane. The remaining 7% of the extracted gas was carbon dioxide as a result of reverse production of the previously injected CO2. However, taking into consideration the phenomena of coal matrix shrinking and swelling, the total amount of injected CO2 decreased to approximately 625,000 sm3.
Highlights
CO2 sequestration in deep unmineable coal seams with parallel methane recovery is considered as one of the potential methods of carbon dioxide utilization [1,2]
The technology consists in the desorption, diffusion and filtration of the methane adsorbed within the coal matrix towards the production wells at the same time when CO2, which is subject to the same processes, will follow the reversed path, i.e., the desorption, diffusion and filtration in coal [3,4,5,6]
The results of the simulations demonstrate that the aggregate amount of carbon dioxide injected into coal seam 405 during the period of one year totaled 1,954,213 sm3
Summary
CO2 sequestration in deep unmineable coal seams with parallel methane recovery is considered as one of the potential methods of carbon dioxide utilization [1,2]. The technology consists in the desorption, diffusion and filtration of the methane adsorbed within the coal matrix towards the production wells at the same time when CO2 , which is subject to the same processes, will follow the reversed path, i.e., the desorption, diffusion and filtration in coal [3,4,5,6]. During the ECBM process, the permeability in the vicinity of the injection well gradually decreases, whereas in the vicinity of the production well it first increases and decreases. This phenomenon is connected with the process of permeability changes within the ECBM technology [7]. The transformation of pore and cleat structures of coal connected with the supercritical CO2 leads to the increase in permeability within the zone of coal
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