The effects of CO 2 injection on the geomechanical behaviour of Australian brown coal: Uniaxial testing

D. R. Viete, P. G. Ranjith, J. Kodikara, Z. Xue

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)

Abstract

Plans for the sequestration of CO 2 in unminable coal seams require the effective retention of the stored gas within the coal seam. If CO 2 is to be retained within a coal seam, the formation of flow paths that allow the escape of sequestered CO 2 to local fault zones must be controlled. In assessing the risk of fracture related CO 2 escape, an understanding of the effect that the introduction of CO 2 has on the geomechanical behaviour of coal is critical. The influence that adsorbed CO 2 has on the strength of coal and its susceptibility to fracturing is of particular importance, since studies outlined in geomechanical literature imply that the adsorption of CO 2 on coal causes a significant reduction in its strength. This paper presents experimental results for an investigation carried out to explore the effect of CO 2 on the strength of brown coal. Preliminary results from uniaxial testing suggest that the adsorption of CO 2 causes a decrease in the strength and modulus of elasticity of brown coal. Thus, geomechanical aspects of coal seam CO 2 sequestration may become an important consideration in assessing long term feasibility of the storage process.

Original languageEnglish
Title of host publicationAmerican Rock Mechanics Association - 40th US Rock Mechanics Symposium, ALASKA ROCKS 2005
Subtitle of host publicationRock Mechanics for Energy, Mineral and Infrastructure Development in the Northern Regions
PublisherAmerican Rock Mechanics Association (ARMA)
ISBN (Print)9781604234541
Publication statusPublished - 1 Jan 2005
EventUS Symposium on Rock Mechanics 2005 - Anchorage, United States of America
Duration: 25 Jun 200529 Jun 2005
Conference number: 40th

Conference

ConferenceUS Symposium on Rock Mechanics 2005
Abbreviated titleUSRMS 2005
CountryUnited States of America
CityAnchorage
Period25/06/0529/06/05

Cite this

Viete, D. R., Ranjith, P. G., Kodikara, J., & Xue, Z. (2005). The effects of CO 2 injection on the geomechanical behaviour of Australian brown coal: Uniaxial testing. In American Rock Mechanics Association - 40th US Rock Mechanics Symposium, ALASKA ROCKS 2005: Rock Mechanics for Energy, Mineral and Infrastructure Development in the Northern Regions American Rock Mechanics Association (ARMA).