Changes in reservoir properties from injection of supercritical CO2 into coal seams: A laboratory study

Massarotto, P., Golding, S. D., Bae, J. S, Iyer, R. and Rudolph, V. (2010). Changes in reservoir properties from injection of supercritical CO2 into coal seams: A laboratory study. In: Suzanne D. Golding, Victor Rudolph, Romeo M. Flores, S. Dai, C. Ö. Karacan and R. Littke, Asia Pacific Coalbed Methane Symposium: Selected papers from the 2008 Brisbane symposium on coalbed methane and CO2-enhanced coalbed methane. APCBM 2008 Asia Pacific Coalbed Methane Symposium, Brisbane, QLD, Australia, (269-279). 22-24 September 2008. doi:10.1016/j.coal.2009.11.002


Author Massarotto, P.
Golding, S. D.
Bae, J. S
Iyer, R.
Rudolph, V.
Title of paper Changes in reservoir properties from injection of supercritical CO2 into coal seams: A laboratory study
Formatted title
Changes in reservoir properties from injection of supercritical CO2 into coal seams — A laboratory study
Conference name APCBM 2008 Asia Pacific Coalbed Methane Symposium
Conference location Brisbane, QLD, Australia
Conference dates 22-24 September 2008
Proceedings title Asia Pacific Coalbed Methane Symposium: Selected papers from the 2008 Brisbane symposium on coalbed methane and CO2-enhanced coalbed methane   Check publisher's open access policy
Journal name International Journal of Coal Geology   Check publisher's open access policy
Place of Publication Amsterdam, Netherlands
Publisher Elsevier
Publication Year 2010
Sub-type Fully published paper
DOI 10.1016/j.coal.2009.11.002
ISSN 0166-5162
1872-7840
Editor Suzanne D. Golding
Victor Rudolph
Romeo M. Flores
S. Dai
C. Ö. Karacan
R. Littke
Volume 82
Issue 3-4
Start page 269
End page 279
Total pages 11
Collection year 2011
Language eng
Formatted Abstract/Summary
Two Australian Permian coals of similar rank but different texture, one predominantly dull and the other predominantly bright, were investigated in laboratory experiments to assess changes in reservoir properties following exposure to supercritical CO2 (SCCO2) and water. Both powdered coal (0.180–0.220 mm) and small cubes (15 mm to a side) were tested in a high-pressure (HP) batch reactor for up to 120 h. Two reaction fluids were used, each on separate sister coal samples: de-ionised water (DH2O) only, and a SCCO2 and DH2O mixture. Properties were measured before and after treatment with: high-pressure CO2 adsorption isotherms (storage capacity); helium pycnometry, mercury porosimetry and low-pressure (LP) CO2 adsorption (density, porosity and PSD effects); leachate chemical analysis for dissolved mineral matter; and water and CO2 permeabilities at in situ conditions during core flood experiments on an 80 mm cube.

Micro and meso porosities for both coals showed significant increases after reactions with the SCCO2 and DH2O mixture. The macroporosity decreased significantly for the dull coal, but increased marginally for the bright coal. Total accessible porosity for dull coal showed virtually no change (0.5%); the bright coal exhibited 3.4% increase from a pre-treatment total porosity of 11.0%. On powdered samples reacted with the mixture, 80%+ increases in internal surface areas, measured using LP CO2 sorption at 0 °C, were noted for both coals. The HP CO2 excess adsorption isotherms on both coals increased after treatment, varying with pressure level, coal type and coal texture. The core flood tests indicated the permeability to CO2, after a waterflood stage, increased significantly. The second stage waterflood exhibited an over 600% increase on the pre-CO2 first stage waterflood permeability. These combined results indicate that mineral matter in Permian coals is dissolved and mobilized by the carbonic acid formed during CO2 dissolution in water, leading to increased porosity, permeability and HP CO2 excess adsorption.
© 2009 Elsevier B.V.
Subjects 0502 Environmental Science and Management
0904 Chemical Engineering
Keyword Coal
Reservoir properties
CO2
Porosity
Permeability
Mineral matter
Adsorption
Carbon-dioxide sequestration
Low-rank coals
Stressed coal
Methane
Sorption
Storage
Beds
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 27 Jun 2010, 00:06:29 EST