Venue: Room 302, Crew Building, University of Edinburgh, King's Buildings | City: Edinburgh, United Kingdom
Dr Jonathan Ennis-King of CSIRO, Australia’s national science agency, provided a talk on the interpretation of multi-level downhole pressure measurements during a field test of subsurface storage of carbon dioxide (CO₂) in CO2CRC’s Otway site in south-east Australia.
Subsurface storage of CO₂ is being used as a means of reducing atmospheric emissions from fossil fuels. One of the key scientific challenges is developing suitable remote monitoring technologies to ensure that the stored CO₂ is behaving as predicted.
At the CO₂CRC Otway project, injection of CO₂-rich gas has allowed the testing of seismic detection, but the collection of pressure data from multiple downhole gauges – both in the injection zone and in a shallower formation – has provided an opportunity to test the performance of pressure monitoring for CO₂ storage.
Apart from the normal process of calibration models of the dynamic flow, the data from multi-level pressure measurements allows the extraction of the average fluid density between the gauges, which can then be used to track the gas-water interface during and after injection.
About Dr Ennis-King
Dr Jonathan Ennis-King is a senior research scientist with CSIRO. He received a PhD in Applied Mathematics from the Australian National University (1989-1993) and subsequently held postdoctoral positions at the University of Melbourne (1993-5), Lund University, Sweden (1996-7) and the Australian National University (1998-9). During this period he worked in the field of theoretical physical chemistry, with research into surface forces, colloids, polymers, polyelectrolytes and non-equilibrium statistical mechanics.
He joined CSIRO in 1999 to work on the geological storage of CO₂. His general research interests are in the modelling and simulation of multiphase flow in porous media, and the coupling of that flow to thermal, mechanical and chemical processes. He has specifically applied this to understanding the behaviour of CO₂ in the subsurface, especially over long time-frames where density-driven convection can be significant.
He has had a key role in the reservoir engineering and simulation of the CO2CRC’s Otway project, the first demonstration of underground storage of CO₂ in Australia.
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