Effects of effective stress changes on permeability of latrobe valley brown coal

Jasinge, Dileeka; Ranjith, P.G.; Choi, S.K.

doi:10.1016/j.fuel.2010.10.053

Cited by 230 publications

(106 citation statements)

References 24 publications

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“…The change in permeability properties will also influence the stress state (Meng et al 2011;Jasinge et al 2011). Therefore, the relationship between coal matrix and fluid (like gas) is interactive and mutually constrained.…”

Section: Concepts and Basic Theoriesmentioning

confidence: 99%

Coal permeability model on the effect of gas extraction within effective influence zone

Xie

Gao

et al. 2015

Geomech. Geophys. Geo-energ. Geo-resour.

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In situ gas extraction is the main measure adopted by mines to achieve mining safety standards. Coal permeability is significantly influenced by coal shrinkage during gas release. Based on effective stress and additional damage that resulted from gas extraction, a unique model was proposed to describe the spatial and temporal distribution of coal permeability within the effective influence zone. Calculation models for the conditions of one and two extracting boreholes were developed. A parametric study on both two models was also conducted, in which the effect of extraction time, extraction pressure, interval between two boreholes, and extraction pressure combination were qualitatively analyzed. The results demonstrated that with the increase of extraction time, gas extraction can result in less permeability reduction in the beginning but can enhance permeability. Coal permeability obviously increases when extraction time increases but gradually stabilizes, presenting ''high middle and low around'' surrounding the extracting borehole. Meanwhile, a decreasing relative amplification implies that permeability ratio does not increase linearly with the increase in extraction pressure. Both intervals between two extracting boreholes and different combinations of extraction pressure significantly influence the distribution of coal permeability. A comparison with some previous permeability studies was conducted to validate the proposed model, and the predicted evolution results matched the permeability testing data. In conclusion, the proposed model is consistent with the phenomenon in real engineering, and the model results can provide preliminary guidance for the design of extracting borehole distribution.

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Section: Concepts and Basic Theoriesmentioning

confidence: 99%

Coal permeability model on the effect of gas extraction within effective influence zone

Xie

Gao

et al. 2015

Geomech. Geophys. Geo-energ. Geo-resour.

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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%

“…This could be due to the fact that under higher confining pressures, potential changes in the stress regime have less effect on pore morphology. 43 In other words, at higher confining stresses, the changes in cleat volume compressibility are reduced providing less sensitivity of the flow rate to the effective stress. 17,22 Figure 17 presents the absolute permeability of the coal sample at different gas pressures and confining pressures.…”

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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“…A more homogenous coal sample would make it easier to identify the effects of coal properties on emissions and thermal performance (Jasinge et al, 2011). Three braziers procured from users in communities (referred to hereafter as field stoves) were tested for thermal performance, emissions of gases and particles.…”

Section: Experimental Stoves and Fuel Analysismentioning

confidence: 99%

Influence of coal properties on the performance of fixed-bed coal-burning braziers

Makonese

Masekameni

Annegarn

2017

J. energy South. Afr.

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Effects of effective stress changes on permeability of latrobe valley brown coal

Cited by 230 publications

References 24 publications

Coal permeability model on the effect of gas extraction within effective influence zone

Coal permeability model on the effect of gas extraction within effective influence zone

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

Influence of coal properties on the performance of fixed-bed coal-burning braziers

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