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II. IEA GEOTHERMAL R&T PROGRAMME ANNEX IV Studies of Mexican geothermal fields under exploitation were also continued. The response to exploitation at Los Azufres was investigated through the examination of the evolution of thermodynamic patterns of reservoir fluids. Results show that the first response to exploitation was observed as a pressure decrease and enthalpy increase in wells, while the processes for the long term response are: decrease in both pressure and mass flow rate, boiling, cooling, steam production; and in wells affected by reinjection, increase in both pressure and mass flow rate. Chemical and isotopic studies of the Los Azufres geothermal fluids indicate that changes in the reservoir are due to exploitation. Reservoir boiling and mixing of reservoir fluids with cooler fluids were the most important processes identified up to 2002. 4.4 Work Planned for 2005 The Soultz project is ongoing and will be continuing into 2006, when the pilot power plant is to be completed. Government aid from the EC, France and Germany will continue to provide funding. The project at Groß Schönebeck runs through 2005 with little funding. The main focus of the work is: reservoir characterization, injection tests and material research. For further use a second borehole is needed. Currently, there is discussion with the ministry about financing the drilling (~ 7 million Euro). 4.5 Outputs Huenges, E., Holl, H., Legarth, B., Zimmermann, G., Saadat, A. (2004) The Stimulation of a sedimentary geothermal reservoir in the north German basin: case study Groß Schönebeck. Proc. 29 Workshop on Geothermal Reservoir Engineering, Stanford University, January, 26-28, 2004. SGP-TR-174-177 Hettkamp, T. et. al. (2004) Energy production from hot rocks. Proc. 29 Workshop on Geothermal Reservoir Engineering, Stanford University, January 26-28, 2004. Trautwein, U., Huenges, E. (2004) Pore pressure induced changes of permeability reflecting microstructural deformation in Rotliegend Sandstones. Submitted to International Journal of Rock Mechanics 2004 Geothermie Reports des Geoforschungszentrums Potsdam (only in German): Report 2004/01 Sandsteine im in situ Geothermielabor Groß Schönebeck-Reservoircharakterisierung, Stimulation, Hydraulik und Nutzungskonzepte. Report 2004/02 Experimente zur Produktivitätssteigerung in der Geothermie-Forschungsbohrung Groß Schönebeck. Geothermal Reports/Papers for 2004 Baumgärtner, J., Jung, R., Hettkamp, T., Teza, D. (2004) The Status of the Hot-Dry-Rock scientific Power Plant at Soultz-sous-Forêts. Z. Angewandte Geologie 2/2004, 12-16. Orzol, J., Jatho, R., Kehrer, P., Tischner, T. (2004) The GeneSys-Project- development of concepts fort he extraction of heat from tight sedimentary rocks. Z. für Angewandte Geowissenschaften, 2/2004, 17-23. IEA Geothermal R&T Annual Report 2004.doc 33PDF Image | Geothermal Energy Annual Report 2004
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