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Carbon Capture and Geologic Storage in India’s Power Sector
Published in Stephen A. Roosa, International Solutions to Sustainable Energy, Policies and Applications, 2020
Coal has a porous structure which contains adsorbed methane. When CO2 is injected into coal, methane is displaced since coal has a higher affinity for CO2 than for methane. Enhanced coal bed methane recovery (CO2-ECBM) expedites the conventional coal bed methane recovery process. Methane is a fuel source that can supplement India’s natural gas reserves.
2 Utilization
Published in S. Komar Kawatra, Advanced Coal Preparation and Beyond, 2020
Enhanced oil recovery (EOR) is a technique to improve the recovery of oil from partially depleted oil reservoirs. As oil is pumped out of the ground the hydrostatic pressure within the reservoir drops, which makes it more difficult to pump additional oil out. This can be counteracted by making the oil easier to move, or putting more pressure onto the reservoir itself. EOR takes advantage of various compounds, including CO2, to achieve these ends. Enhanced gas recovery or enhanced coal bed methane recovery are similar techniques which can be used with gas reservoirs and coal beds to improve product recovery in those conditions as well.
Numerical simulation study on CO2 storage in coalbed
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Ling Qiao, Cunbao Deng, Yongpeng Fan
In recent years, many experiments have been conducted on numerical simulation of CO2 coalbed storage and Coal Bed Methane (CBM) extraction. Experiments have been conducted to show that in the process of CO2 injection into the coal seam, the permeability of coal decreases rapidly due to the adsorption of CO2 by coal matrix, and the complexity of coal structure makes the prediction of CO2 storage extremely complicated (Oldenburg 2007). Researchers (Ranathunga et al. 2015) studied the permeation rule of subcritical and supercritical CO2 in large coal samples (203 mm in diameter and 1,000 mm in length) by experiment. A series of unconfined compressive strength tests was conducted on Australian brown coal samples, under various CO2 pressures (2–10 MPa) at 35℃ to study the effects of sequestrated CO2 phase condition on coal strength (Ranathunga et al. 2016). Researchers (Vishal et al., 2017) studied the CO2 percolation characteristics of coal under different injection pressures and effective stress by experiment. Then, the long-term Enhanced Coal Bed Methane Recovery (ECBM) project of Indian Gondwana coals is analyzed by numerical simulation, and the CO2 storage and coalbed methane production at different stages are predicted (Vishal et al. 2018).