Quantitative analysis of carbon dioxide replacement of adsorbed methane in different coal ranks using low-field NMR technique

Bai, Gang; Zhou, Zhongjie; Li, Xueming; Cheng, Yuantao; Hu, Kun; Chen, Ying; Zhou, Xihua

doi:10.1016/j.fuel.2022.124980

Cited by 18 publications

(7 citation statements)

References 44 publications

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“…Microscopic pores in coal govern gas adsorption and desorption on the coal matrix surface. They are critical for CBM diffusion (via nanoscale pores) and seepage (via micrometer-to-millimeter holes and fractures) . The coal seam’s permeability, governed by Darcy’s flow, and intrinsic permeability, governed by Fick’s diffusion, determine the CO 2 movements in the coal seams.…”

Section: Theorymentioning

confidence: 99%

“…They are critical for CBM diffusion (via nanoscale pores) and seepage (via micrometer-to-millimeter holes and fractures). 54 The coal seam's permeability, governed by Darcy's flow, and intrinsic permeability, governed by Fick's diffusion, determine the CO 2 movements in the coal seams. The general gas transport in coal fissures consists of three stages: adsorption/desorption, diffusion in micropores, and transport in cleats.…”

Section: Co 2 Injection In Coalmentioning

confidence: 99%

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Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Mwakipunda,

Wang,

Mgimba

et al. 2023

Energy Fuels

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CO 2 -enhanced coalbed methane (CO 2 -ECBM) technology helps to store CO 2 while producing a clean source of energy (CH 4 ) through the sorption process. This technique can sequester much CO 2 at low temperatures and pressures while recovering CH 4 , which will help offset the associated costs, such as capturing injection gases, drilling and completion infrastructure, compression, and injection expenses. This review paper critically analyzes the CO 2 sequestration potentiality in deep unmineable coal seams. The results revealed that, despite several researchers' insights from proposed concepts, experimental data, modeling and simulations, and pilot tests, there are no reported full field CO 2 -ECBM technology applications for CO 2 sequestration and CH 4 recovery because implementing the projects is uneconomical. Also, CO 2 sequestration and CH 4 recovery effectiveness on coal seams depend on wettability changes of the CO 2 −H 2 O−coal system. The identified research gaps and challenges in this paper are going to help various researchers and shareholders in conducting extra investigations toward full field application of CO 2 sequestration while simultaneously producing a clean source of energy (CH 4 ) in deep unmineable coal seams to meet the Paris climate summit agreement to achieve net zero emissions by 2050 and a maximum global temperature rise of 1.5 °C.

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Section: Theorymentioning

confidence: 99%

Section: Co 2 Injection In Coalmentioning

confidence: 99%

Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Mwakipunda,

Wang,

Mgimba

et al. 2023

Energy Fuels

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“…The pressure of CO 2 at the bottom of the caprock layer continuously increases with the CO 2 accumulation from the storage reservoir. If the CO 2 pressure is lower than the sum of the reservoir pressure and entry capillary pressure [ 34 , 35 ], the Darcy flow does not occur. This kind of sealing is called the capillary sealing.…”

Section: Multi-physical Interaction Model For a Fractured Caprock Layermentioning

confidence: 99%

Combined Effects of CO2 Adsorption-Induced Swelling and Dehydration-Induced Shrinkage on Caprock Sealing Efficiency

Shang

Wang

et al. 2022

IJERPH

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Carbon dioxide (CO2) may infiltrate into the caprock and displace brine water in the caprock layer. This causes two effects: one is the caprock swelling induced by the CO2 adsorption and the other is the caprock dehydration and shrinkage due to CO2–brine water two-phase flow. The competition of these two effects challenges the caprock sealing efficiency. To study the evolution mechanism of the caprock properties, a numerical model is first proposed to investigate the combined effects of CO2 adsorption-induced expansion and dehydration-induced shrinkage on the caprock sealing efficiency. In this model, the caprock matrix is fully saturated by brine water in its initial state and the fracture network has only a brine water–CO2 two-phase flow. With the diffusion of CO2 from the fractures into the caprock matrix, the CO2 sorption and matrix dehydration can alter the permeability of the caprock and affect the entry capillary pressure. Second, this numerical model is validated with a breakthrough test. The effects of the two-phase flow on the water saturation, CO2 adsorption on the swelling strain, and dehydration on the shrinkage strain are studied, respectively. Third, the permeability evolution mechanism in the CO2–brine water mixed zone is investigated. The effect of dehydration on the penetration depth is also analyzed. It is found that both the shale matrix dehydration and CO2 sorption-induced swelling can significantly alter the sealing efficiency of the fractured caprock.

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“…Coal, being a major fossil fuel, contributes significantly to global energy consumption. , The active functional groups in coal react with oxygen and release heat during the mining and storing processes. If not regulated in time, the accumulating heat will cause coal to spontaneously burn, resulting in massive resource loss environmental devastation, and even casualties. − For the effective control of the spontaneous ignition of coal, domestic and foreign industry scholars have developed various types of inhibitor products to suppress coal spontaneous combustion…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Inhibition Effect of the Inhibitor on Coal Spontaneous Combustion Under Critical Temperature

Zhang,

Zou,

et al. 2024

ACS Omega

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At present, related research on inhibitors has been gradually improved, but there is still a lack of research on the inhibition characteristics at specific release temperatures and the mechanism of inhibiting coal spontaneous combustion. Based on this, In this study, the inhibition characteristics of adding inhibitor to coal under critical temperature (R70) are studied in depth. In the experiment, lignite was selected as the research object, and four different types of inhibitors, MgCl 2 , triphenyl phosphite (TPPI), Phytic acid (PA), and melatonin, were applied to coal samples at room temperature and 70 °C, respectively. The temperatureprogrammed-gas chromatography test and Fourier infrared spectroscopy experiment were carried out, and the oxidation kinetic parameters were calculated to study the oxidation characteristics and micromechanism of the coal samples in the process of spontaneous combustion. The experimental results show that the amount of CO gas release and oxygen consumption rate are lower, and the inhibition rate and apparent activation energy are higher when the inhibitor is added under R70 than at room temperature. Under R70, the content of oxygen-containing functional group −COOH with higher activity of inhibitor is reduced, the generation of active sites is inhibited, the concentration of active center is reduced, the path of mutual transformation between active sites and oxygen-containing functional groups is blocked, and the active groups are promoted to form a relatively stable inert oxygencontaining ether bond, which reduces the spontaneous combustion tendency of coal.

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Quantitative analysis of carbon dioxide replacement of adsorbed methane in different coal ranks using low-field NMR technique

Cited by 18 publications

References 44 publications

Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Combined Effects of CO2 Adsorption-Induced Swelling and Dehydration-Induced Shrinkage on Caprock Sealing Efficiency

Experimental Study on the Inhibition Effect of the Inhibitor on Coal Spontaneous Combustion Under Critical Temperature

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Quantitative analysis of carbon dioxide replacement of adsorbed methane in different coal ranks using low-field NMR technique

Cited by 18 publications

References 44 publications

Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO2-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO2-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Combined Effects of CO2 Adsorption-Induced Swelling and Dehydration-Induced Shrinkage on Caprock Sealing Efficiency

Experimental Study on the Inhibition Effect of the Inhibitor on Coal Spontaneous Combustion Under Critical Temperature

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Product

Resources

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Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications

Recent Advances in Carbon Dioxide Sequestration in Deep Unmineable Coal Seams Using CO₂-ECBM Technology: Experimental Studies, Simulation, and Field Applications