This paper presents geoengineering and economic sensitivity analyses and
assessments of the Wunger Ridge flank carbon capture and storage (CCS) site.
Both geoengineering and economics are needed to derive the number of wells
required to inject a certain amount of CO2 for a given period.
A numerical reservoir simulation examines injection rates ranging from 0.5
to 1.5 million tonnes of CO2 year for 25 years of injection. Primary
factors affecting the ability to inject CO2 include permeability,
formation fracture gradient, aquifer strength, and multiphase flow functions.
Secondary factors include the solubility of CO2 in the formation
brine, injection well location with respect to the flow
barriers/low-permeability aquifers, model geometry including faults, grid size
and refinement, and injection well type. Less significant factors include
The economics are assessed using an internally developed technoeconomic
model. The model optimizes the CO2 injection cost on the basis of
geoengineering data and recent equipment costs. The overall costs depend on the
initial costs of CO2 separation and source-to-sink distances and
their associated pipeline costs. Secondary cost variations are highly dependent
on fracture gradient, permeability, and CO2 injection rates.
Depending on the injection characteristics, the specific cost of CO2
avoided is between AUS 62 and 80 per tonne.
Australia’s fossil-fuel fired power plants emit 194 million tonnes of
CO2 each year (Mt CO2/yr), and approximately 26 Mt/yr of
this comes from southeast Queensland. A multidisciplinary study has recently
identified the onshore Bowen basin as having potential for geological storage
of CO2 (Sayers et al. 2006a). In that paper, geological containment
and injectivity and reservoir engineering simulation sensitivities showed that
a target injection rate of 1.2 Mt CO2/yr over a 25-year project life
span could be achieved (i.e., equivalent to injecting the emissions from a 400
MW gas based power station). This study further examines reservoir engineering
and economics sensitivities.
© 2009. Society of Petroleum Engineers
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- Original manuscript received:
18 August 2007
- Meeting paper published:
30 October 2007
- Revised manuscript received:
1 May 2009
- Manuscript approved:
21 June 2009
- Published online:
28 October 2009
- Version of record:
28 October 2009