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II. IEA GEOTHERMAL R&T PROGRAMME ANNEX III of this Subtask. As needed, equipment will be made available after mutual agreement among the participants. Each participant will be responsible for its own staff and equipment provided for field studies at an EGS site, including salary, insurance, transportation, subsistence and other essential expenses. 3.3 Work Performed in 2004 3.3.1 Subtask B- Application of Conventional Geothermal Technology to EGS Enhanced Geothermal Systems (EGS) are engineered reservoirs that have been created to extract economical amounts of heat from otherwise unproductive geothermal resources. The US Department of Energy (DOE) has sponsored several activities using hydrothermal technology for enhanced geothermal systems. In addition, several projects initiated in response to research needs of the hydrothermal community are being implemented in geothermal fields with ongoing EGS projects. Drilling The geothermal drilling industry recently completed a study of new directional drilling technology. A test of an air-driven high-temperature downhole drilling motor was recently conducted at the Geysers geothermal field. The tool will be useful for drilling directional wells in geothermal environments where the introduction of conventional drilling fluids might damage the reservoir. Extended Heat Flow Studies for EGS Heat flow studies initiated for hydrothermal exploration have been extended to the search for areas of the United States suitable for EGS. The DOE continues to fund heat flow studies in order to better delineate targets for both hydrothermal and EGS development. A new map of the heat flow of North America, prepared by the Southern Methodist University Geothermal Group, was published in June 2004 by the American Association of Petroleum Geologists. The map covers traditional hydrothermal areas as well as areas that will need enhancement Figure 3.1 A high temperature televiewer is being tested at the Coso geothermal field, California, USA. (Credit: US DOE) IEA Geothermal R&T Annual Report 2004.doc 25PDF Image | Geothermal Energy Annual Report 2004
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