An update on modelling of the Ohaaki geothermal system

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dc.contributor.author Clearwater, Emily en
dc.contributor.author O'Sullivan, Michael en
dc.contributor.author Brockbank, K en
dc.coverage.spatial Auckland, New Zealand en
dc.date.accessioned 2014-10-14T02:14:35Z en
dc.date.issued 2011-11-23 en
dc.identifier.citation New Zealand Geothermal Workshop, Auckland, New Zealand, 21 Nov 2011 - 23 Nov 2011. Editors: O'Sullivan MJ. New Zealand Geothermal Workshop 2011 Proceedings. 23 Nov 2011 en
dc.identifier.uri http://hdl.handle.net/2292/23221 en
dc.description.abstract Since the Ohaaki power station was commissioned in 1988, a series of large three-dimensional numerical models of the Ohaaki geothermal system have been developed at the University of Auckland in collaboration with Contact Energy and its predecessors. Over the course of 2010 and 2011 the model has been reviewed and re-calibrated in order to improve the match between measured data and model results. This was part of an ongoing effort to represent the Ohaaki system more accurately, so that the model can be used to better predict the future behaviour of the resource. Updates of the model grid include horizontal refinement and deepening of the model. During the calibration process some adjustments were made to the deep up flow of very hot water and CO2 at the base of the model. Also some adjustments were made to permeabilities and porosities, including the use of the LEAPFROG software to make the rock type assignment in our reservoir model better match the geological model developed by Contact Energy and GNS Science. Natural state simulations were used to compare the model results to the temperature data for the pre-exploitation state of the reservoir. Then production history simulations were carried out and pressure, temperature, CO2 flow and enthalpy data were compared to model results, using data from the well testing period, the recovery period and the production period. Overall, a significant improvement in the model match has been made compared to the previous (2006) model. en
dc.relation.ispartof New Zealand Geothermal Workshop en
dc.relation.ispartofseries Proceedings 33rd New Zealand Geothermal Workshop en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title An update on modelling of the Ohaaki geothermal system en
dc.type Conference Item en
pubs.begin-page 1 en
pubs.author-url http://www.geothermal-energy.org/cpdb/record_detail.php?id=7826 en
pubs.end-page 8 en
pubs.finish-date 2011-11-23 en
pubs.publication-status Published en
pubs.start-date 2011-11-21 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Proceedings en
pubs.elements-id 275457 en
pubs.org-id Engineering en
pubs.org-id Engineering Science en
pubs.record-created-at-source-date 2014-10-01 en


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