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II. IEA GEOTHERMAL R&T PROGRAMME ANNEX IV 4.2.4 Subtask C-Reservoir Evaluation (Subtask Leader: to be appointed) Subtask C seeks to exchange experience on materials and chemistries among the group. Published and unpublished information is gathered on past, present and planned experiences, and tests and research on materials in deep and aggressive geothermal systems. The information is then summarized in a database. 4.3 Work Performed in 2004 4.3.1 Australia Australia is currently involved in a pioneering EGS project in the Cooper Basin. The EGS venture of Geodynamics Limited in the Cooper Basin is working on a venture in an attempt to enable the production of electricity at lower costs than other mainstream renewable energy resources using deep, high temperature rock. Habanero-2, the second deep geothermal well drilled in Australia, was completed to a depth of 4,358 m in 2005. Habanero-2 will be the production well of the pair, which includes Habanero-1, the injection well. The geothermal resource is one of the hottest in the Cooper Basin, with temperatures in excess of 250 °C confirmed. Pressure communication was established between the two wells during the Habanero-2 drilling phase. 4.3.2 Germany The deep geothermal projects conducted by and participated in by Germany in 2004 included: • Groß Schönebeck The Groß Schönebeck study involved the in-situ investigation of the low enthalpy, Rotliegend reservoir in the northeast German Basin where thick, low permeability rocks attain temperatures necessary for geothermal power generation at depths of 4,000-5,000 m. This is part of an interdisciplinary project to develop the geothermal technology necessary for extracting existing geothermal fluid for electricity production through hydraulic fracturing to increase permeability in siliciclastic sediments and volcanic rocks of Rotliegend formation. Reprocessing of seismic data on the regional scale, and information obtained from an acoustic televiewer and fullbore formation micro-imager helped identify local stress features and show they agree with regional stress orientation and fault patterns. Recent analysis of stimulation experiments conducted at Groß Schönebeck have also been successful, with flow rates increased significantly compared to the initial hydraulic state. However, further experiments are needed to stimulate areas farther away from the well and thereby hopefully increasing the flow to economic levels. • EC Soultz-sous-Forêts (Alsace, France) Germany continued its participation in 2004, with France, Italy, Switzerland and the EC, on the European Soultz-sous-Forêt project to develop a scientific geothermal pilot plant as the first phase. The second production well, GPK-4, was drilled in 2004. Hydraulic stimulation tests were initiated. 4.3.3 Mexico Activities directed to the rigorous simulation of mass and heat transport in high-temperature hydrothermal reservoirs continue. The thermodynamic properties of single and binary fluids in the system H2O-CO2-CH4 were calculated and compared well with those published for water, carbon dioxide and methane, as well as their binary mixtures. IEA Geothermal R&T Annual Report 2004.doc 32PDF Image | Geothermal Energy Annual Report 2004
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