Journal article
Determining residual CO2 saturation through a dissolution test - Results from the CO2CRC Otway Project
RR Haese, T Laforce, C Boreham, J Ennis-King, BM Freifeld, L Paterson, U Schacht
Energy Procedia | ELSEVIER SCIENCE BV | Published : 2013
Abstract
Residual CO2 trapping (Sgr-CO2) is a key mechanism for geological CO2 storage. The CO2CRC undertook a sequence of field tests with the aim of comparing different ways of determining Sgr-CO2 including a dissolution test. Dissolution test results show an unexpectedly early breakthrough and low maximum CO2 concentrations in the backproduced water making the data inconclusive when using traditional data interpretation. Here, we consider two conditions to explain the observations: Firstly, residual CO2 is vertically unevenly distributed and, secondly, the fluid and residual CO2 are not in equilibrium. Furthermore, we postulate localised flow channels have formed during the 3- month test period ca..
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Funding Acknowledgements
The authors wish to thank Rajindar Singh from the CO2CRC, Linda Stalker from CSIRO, Jay Black, Teagan Exposito, Janice Trafford and Eleena Wykes from Geoscience Australia, and the personnel from AGR for their support at the Otway site during the test. Eric Tenthorey and Jay Black provided valuable comments on an earlier version of the manuscript. Funding was provided by the Australian Government through its CRC Program to support this research. The authors acknowledge financial assistance provided through Australian National Low Emissions Coal Research and Development (ANLEC R&D). ANLEC R&D is supported by Australian Coal Association Low Emissions Technology Limited and the Australian Government through the Clean Energy Initiative. This publication has received permission for publication by the CEO of Geoscience Australia.