Investigation of the influence of coal swelling on permeability characteristics using natural brown coal and reconstituted brown coal specimens

Jasinge, Dileeka; Ranjith, P.G.; Choi, Xavier; Fernando, J.

doi:10.1016/j.energy.2012.01.010

Cited by 63 publications

(28 citation statements)

References 14 publications

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“…Reduction in permeability attributed to the effect of coal swelling and closure of micro-cleats. This compares favourably to similar observation reported elsewhere (Jasinge et al 2012). …”

Section: Cleat Structure and Mechanism Of Gas Permeabilitysupporting

confidence: 77%

Laboratory investigation of gas permeability and its impact on CBM potential

Kumar¹,

Mishra

2018

J Petrol Explor Prod Technol

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Gas permeability is an important characteristic of coal seam(s) to determine the economic success of CH 4 extraction and CO 2 sequestration. There exists no comprehensive approach to predict the mechanical behaviour during CH 4 extraction, and CO 2 sequestration as coal is highly heterogeneous. Exhaustive laboratory experimentation is often the only approach to successfully predict its behaviour. Coal experiences triaxial stress conditions when change of force field occurs. This paper presents the mechanical properties and change in gas permeability at varying confining as well as gas pressures in a triaxial experimental set-up using Darcy's approach. Mutual relations between permeability, in situ confining pressure as well as gas pressure have been established statistically. A reservoir simulation investigation has been carried out to predict the rate of coal bed methane (CBM) production and the cumulative amount of CBM over the 5-year life of production well.

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“…Reduction in permeability attributed to the effect of coal swelling and closure of micro-cleats. This compares favourably to similar observation reported elsewhere (Jasinge et al 2012). …”

Section: Cleat Structure and Mechanism Of Gas Permeabilitysupporting

confidence: 77%

Laboratory investigation of gas permeability and its impact on CBM potential

Kumar¹,

Mishra

2018

J Petrol Explor Prod Technol

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“…Further, the Young's modulus of the tested Australian brown coal exhibits around 26% average reduction, while the tested Australian black coal shows an average reduction of around 47%. In addition, for 3 MPa CO 2 saturation, the tested Australian brown coal shows a UCS reduction of 9.21% and Young's modulus reduction of 20.18%, while the tested Indian black coal shows 17.6% and 26.2% reductions in UCS and Young's modulus, respectively (see Table 1). The reason is the naturally existing well-developed cleat system in high rank coal that acts as a locus for CO 2 movement, permitting a greater matrix alteration compared to low rank coal with a less-developed cleat system.…”

Section: Introductionmentioning

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%

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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“…p, ε L and P L are consistent with Equations (28) and (29). The BET adsorption model is a generalization of the Langmuir model considering multi adsorbed molecule layers, which is expressed by [57,61] …”

Section: Swelling Strain and Swelling Stressmentioning

confidence: 79%

Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

Liu

Wang

et al. 2017

Minerals

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CO 2 geosequestration is currently considered to be the most effective and economical method to dispose of artificial greenhouse gases. There are a large number of coal mines that will be scrapped, and some of them are located in deep formations in China. CO 2 storage in abandoned coal mines will be a potential option for greenhouse gas disposal. However, CO 2 trapping in deep coal pillars would induce swelling effects of coal matrix. Adsorption-induced swelling not only modifies the volume and permeability of coal mass, but also causes the basic physical and mechanical properties changing, such as elastic modulus and Poisson ratio. It eventually results in some reduction in pillar strength. Based on the fractional swelling as a function of time and different loading pressure steps, the relationship between volumetric stress and adsorption pressure increment is acquired. Eventually, this paper presents a theory model to analyze the pillar strength reduction after CO 2 adsorption. The model provides a method to quantitatively describe the interrelation of volumetric strain, swelling stress, and mechanical strength reduction after gas adsorption under the condition of step-by-step pressure loading and the non-Langmuir isothermal model. The model might have a significantly important implication for predicting the swelling stress and mechanical behaviors of coal pillars during CO 2 sequestration in abandoned coal mines.

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Investigation of the influence of coal swelling on permeability characteristics using natural brown coal and reconstituted brown coal specimens

Cited by 63 publications

References 14 publications

Laboratory investigation of gas permeability and its impact on CBM potential

Laboratory investigation of gas permeability and its impact on CBM potential

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

Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines

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