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I. EXECUTIVE SUMMARY economics of hot dry rock systems, was successfully completed in 2001 (Details are provided in IEA Geothermal Annual Report 2002, Chapter 3). Work on this Annex started in 1997 and was extended by the ExCo in 2001 for another 4 years to 2005. Highlights of 2004 Annex III Activities An air-driven high-temperature downhole drilling motor, successfully tested at the Geysers geothermal field, will be useful for drilling directional wells where conventional drilling fluids might damage the reservoir. A new heat flow map for North America was prepared and published, and will be useful for locating geothermal reservoirs that need enhancement. Studies are underway to adapt recent advances in petroleum tracer test interpretation methods to EGS, for estimating fluid flow paths, sweep efficiency, reservoir surface area and fluid velocities in fractured geothermal reservoirs. A new high-temperature acoustic televiewer has been developed and will be useful for obtaining fracture information in geothermal reservoirs. The first version of the EGS-PMDA, or Project Management Decision Assistant, was completed and disseminated for review. The compilation of data for the Hijiori and Ogachi geothermal fields continues and a review of the Hijiori data was completed, with a portion useful to the subtask to be published in English in early 2005. Many of the results from Annex III were presented at international workshops and conferences including the 2004 Annual Meeting of the Geothermal Resources Council (GRC); the Annex III meeting at AIST in Tsukuba, Japan; and the Workshop on Geothermal Reservoir Engineering, Stanford, USA. Ten scientific papers describing the results were also published. The Operating Agent is the New Energy & Industrial Technology Development Organization (NEDO), Japan. I. Matsunaga (AIST, Tsukuba) is Task Leader. ANNEX IV - Deep Geothermal Resources This Annex addresses issues necessary for the commercial development of deep geothermal resources at depths greater than about 3,000 m. The activities have been divided into three subtasks: research on exploration technologies and reservoir engineering for deep, hot reservoirs; investigation into drilling and logging techniques; and exchange of information and establishment of a database on fluid chemistry, material properties and corrosion issues, together with field-testing (Chapter 4). The work of this Annex is very closely related to that in Annex III (EGS) because enhanced geothermal systems studies are being pursued in several regions where the desired high temperatures are reached at much greater depths (> 4,000 m) than in the “normal” high- temperature geothermal fields. Consequently, some of the projects “cross-over”, with activities being pursued in both Annexes. This overlap of project work within the two Annexes is currently being addressed. Work on this Annex began in 1997 and was extended in 2001 by the ExCo for another 5 years to 2006. Highlights of 2004 Annex IV Work The second deep geothermal well to be drilled in the Cooper Basin, Australia, was successfully completed to a depth of over 4,350 m, with pressure communication established with the first well during the drilling. As part of the European Soultz project, a fourth well and the designated second production well, was successfully drilled and hydraulic stimulation tests initiated. As part of the German deep geothermal project at Groß Schönebeck, IEA Geothermal R&T Annual Report 2004.doc 6PDF Image | Geothermal Energy Annual Report 2004
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