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I. EXECUTIVE SUMMARY reprocessing of seismic data in conjunction with acoustic televiewer and fullbore micro- imager information identified local stress features; and stimulation experiments have been successful in significantly increasing flow rates over those initially obtained. As part of efforts in Mexico to rigorously simulate mass and heat transport in hydrothermal reservoirs, results from the calculation of thermodynamic properties of single and binary fluids in the system H2O-CO2-CH4 compared well with those published for water, carbon dioxide and methane, as well as their binary mixtures. In addition, studies of Mexican geothermal fields under exploitation continued, with investigation of the evolution of thermodynamic properties of reservoir fluids defining the response: first is a pressure decrease and enthalpy increase in wells, and in the longer term: decrease in both pressure and mass flow rate, boiling, cooling, steam production. Results obtained in the Annex work were presented at the Workshop on Geothermal Reservoir Engineering, Stanford, USA, and published as 12 reports and papers in international journals. Project Management Organization Jülich, Germany, is the Operating Agent. Dieter Rathjen is the Task Leader (Project Management Organization Jülich). ANNEX V - Sustainability of Geothermal Energy Utilization The objective of this Annex is to study the important aspects of energy production from geothermal resources with the view of determining the long-term economic sustainability of such production. There was no significant activity towards the development of this Annex during 2004. ANNEX VI - Geothermal Power Generation Cycles This proposed annex would develop scenarios as a basis for comparison of cycles, plant performance and availability, economics and environmental impact and mitigation. The output would be a database and guidelines of best practice. A draft of this Annex has been prepared, though no further consideration was given to it in 2004. The ExCo has agreed that it would be implemented as soon as two or more participants agreed to join. ANNEX VII - Advanced Geothermal Drilling Techniques This Annex pursues advanced geothermal drilling research and investigates all aspects of well construction with the aim of reducing the costs associated with this essential and expensive part of geothermal exploration, development and utilization. The investigation is divided into three subtasks: the compilation of geothermal well drilling cost and performance information that is maintained on a database; production of a geothermal drilling best practices handbook; and monitoring and exchange of information on drilling technology development and new applications (Chapter 5). This study began in 2001 and will continue through 2005. Highlights of 2004 Annex Activities The working group for this Annex held two meetings at which subtask objectives and specific activities performed in 2004 were discussed. Two posters describing the Annex’s work were prepared for the World Geothermal Congress 2005 and thirteen papers and reports produced. IEA Geothermal R&T Annual Report 2004.doc 7PDF Image | Geothermal Energy Annual Report 2004
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