The effects of sub-critical and super-critical carbon dioxide adsorption-induced coal matrix swelling on the permeability of naturally fractured black coal

Perera, M.S.A.; Ranjith, P.G.; Choi, S.K.; Airey, David

doi:10.1016/j.energy.2011.09.023

Cited by 149 publications

(87 citation statements)

References 25 publications

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“…Therefore, the removal of moisture from the sample is also higher, which causes greater strength gains. Apart from this moisture release, N2 injection may also cause the release of some adsorbed phase gases such as methane and CO2 from the coal matrix [22]. The adsorption of any of these coal seam gases (CH4, CO2) causes the coal matrix to swell and injecting N2 causes these swelled areas to recover to some extent.…”

Section: Rank Effect On N 2 Saturation-created Geomechanical Alteratimentioning

confidence: 99%

“…Hence, it is vital to identify how different types of coals behave under the effect of moisture. In the case of N 2 saturation, researchers [3,[20][21][22][23] have found that N 2 has the ability to recover CO 2 adsorption-induced coal matrix alteration, which eventually enhances the hydraulic properties of the coal matrix. Perera, Ranjith and Peter [24] have investigated the behavior of N 2 and CO 2 saturation on low-rank brown coal and observed around 2% increase in strength and Young's modulus for 3 MPa N 2 saturation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Coal Rank on Various Fluid Saturations Creating Mechanical Property Alterations Using Australian Coals

2016

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During CO 2 sequestration in deep coal seams, the coal mass may be subjected to various fluid (CO 2 , N 2 , etc.) saturations. Therefore, in order to maintain the long-term integrity of the process, it is necessary to identify the mechanical responses of preferable coal seams for various fluid saturations. To date, many studies have focused on the CO 2 saturation effect on coal mass strength and less consideration has been given to the influence of other saturation mediums. Hence, this study aims to investigate coal's mechanical responses to water and N 2 saturations compared to CO 2 saturation and to determine the effect of coal-rank. A series of unconfined compressive strength (UCS) tests was conducted on Australian brown and black coal samples saturated with water and N 2 at various saturation pressures. An advanced acoustic emission (AE) system was utilized to identify the changes in crack propagation behaviors under each condition. According to the results, both CO 2 and water act similarly with coal by enhancing the ductile properties of the coal mass and this mechanical weakening is greater for high-rank coal. Conversely, N 2 saturation slightly enhances coal strength and delays crack propagation in coal and this strength enhancement can be improved by increasing the N 2 saturation pressure.

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Section: Rank Effect On N 2 Saturation-created Geomechanical Alteratimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Coal Rank on Various Fluid Saturations Creating Mechanical Property Alterations Using Australian Coals

2016

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“…However, there is still much that is not understood about coal-CO 2 interactions (Mirzaeian and Hall, 2006;Larsen, 2004). Most studies reported in literature are conducted at short adsorption periods (up to 2 weeks) and/or low pressures (b 60 bar) (Perera et al, 2011;Romanov and Soong, 2008;Sakurovs et al, 2007). In the effort to predict the long term effects of CO 2 storage in coal seams, it is essential to gather information on coal-CO 2 interactions and their effects on the coal structure and its properties (Larsen, 2004).…”

Section: Introductionmentioning

confidence: 98%

Physical and structural effects of carbon dioxide storage on vitrinite-rich coal particles under subcritical and supercritical conditions

Mavhengere

Maphala

Wagner

2015

International Journal of Coal Geology

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“…Jasinge et al 43 have mentioned the possibility of a transition of the flow regime to a non-Darcian gas flow. The non-linearity in gas flow behaviour has been also attributed to the influence of changes in the effective stress on cleat permeability 22,[43][44][45] and strong dependency of cleat volume compressibility to mean pore pressure, especially at low pressures. 17 In addition, the compliance of the system due to changes in stress conditions can also be influential on the non-linearity observed between the gas flow rates and differential gas pressure.…”

Section: Gas Flow and Permeability Evolution In Coalmentioning

confidence: 99%

High pressure gas flow, storage, and displacement in fractured rock—Experimental setup development and application

Mosleh

Turner

Sedighi

2017

Review of Scientific Instruments

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This paper presents the design, development, and application of a laboratory setup for the experimental investigations of gas flow and reactions in a fractured rock. The laboratory facility comprises (i) a high pressure manometric sorption apparatus, where equilibrium and kinetic phenomena of adsorption and desorption can be examined, (ii) a high pressure triaxial core flooding system where the chemical reactive transport properties or processes can be explored, and (iii) an ancillary system including pure and mixed gas supply and analysis units. Underground conditions, in terms of pore pressure, confining pressure, and temperature, can be replicated using the triaxial core flooding system developed for depths up to 2 km. Core flooding experiments can be conducted under a range of gas injection pressures up to 20 MPa and temperatures up to 338 K. Details of the design considerations and the specification for the critical measuring instruments are described. The newly developed laboratory facility has been applied to study the adsorption of N2, CH4, and CO2 relevant to applications in carbon sequestration in coal and enhanced coalbed methane recovery. Under a wide range of pressures, the flow of helium in a core sample was studied and the evolution of absolute permeability at different effective stress conditions has been investigated. A comprehensive set of high resolution data has been produced on anthracite coal samples from the South Wales coalfield, using the developed apparatus. The results of the applications provide improved insight into the high pressure flow and reaction of various gas species in the coal samples from the South Wales coalfield.

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The effects of sub-critical and super-critical carbon dioxide adsorption-induced coal matrix swelling on the permeability of naturally fractured black coal

Cited by 149 publications

References 25 publications

Effect of Coal Rank on Various Fluid Saturations Creating Mechanical Property Alterations Using Australian Coals

Effect of Coal Rank on Various Fluid Saturations Creating Mechanical Property Alterations Using Australian Coals

Physical and structural effects of carbon dioxide storage on vitrinite-rich coal particles under subcritical and supercritical conditions

High pressure gas flow, storage, and displacement in fractured rock—Experimental setup development and application

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