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II. IEA GEOTHERMAL R&T PROGRAMME ANNEX III Petroleum Tracer Test Methods for EGS The DOE researchers are investigating ways to apply petroleum tracer test interpretation methods to EGS. The research will provide new methods to estimate fluid flow paths, sweep efficiency, reservoir surface area and fluid and temperature velocities in fractured geothermal reservoirs. Papers describing the methodology were presented at the Geothermal Resources Council (GRC) 2004 Annual Meeting and the 30th Stanford Geothermal Workshop (February 1, 2005). High Temperature Instrumentation A new high temperature acoustic televiewer has been developed with cooperative funding from the DOE and US Navy. The televiewer has been tested at the Coso geothermal field at temperature up to about 235 oC. The tool is designed for a maximum temperature of 275 oC. The tool will be used to obtain fracture information in both hydrothermal and enhanced geothermal systems. Geochemical Studies The DOE is funding researchers to characterize the effects of injecting liquid into the vapour- dominated reservoir at The Geysers. These studies include heat transfer, injection/production induced seismicity and chemical changes in the produced steam. Researchers also continue to extend rock-water interaction studies in hydrothermal systems to EGS. Several rock-water interaction papers were included in the 2004 GRC Annual Meeting. These papers describe work initiated for hydrothermal systems and now applied to EGS. Parametric Analysis of Required Reservoir Properties Recently, researchers have initiated a parametric study of temperature, depth, reservoir surface area (matrix and fracture), productivity, well-bore friction and drilling costs to determine approximate boundaries for commercial development. A paper discussing the results will be presented at the Geothermal Resources Council 2005 annual meeting 3.3.2 Subtask C- Data Acquisition and Processing The worldwide experience gained from some of the major EGS research and development projects within the last 30 years was compiled into a first version of a Project Management Decision Assistant (PMDA) in 2003. This handbook shall provide new project teams with the access to a synthesis of the available information to support a successful and unhindered project start. In 2004, the first version of the EGS-PMDA classifier was disseminated to 8 participants of Annex III for a review. The EGS-PMDA was presented at the Annex meeting during the 12th GIA ExCo Meeting in Pisa in October 2004 and at the Annex III meeting at AIST in Tsukuba, Japan, in November 2004. The diagram in Figure 3.2 gives an overview of the scope of this data-orientated management aid. In principle, it indicates which items of data and information must be obtained during a project in progress ("Project planning") and where to obtain those data and experiences already available ("Sources of Know-How"). IEA Geothermal R&T Annual Report 2004.doc 26PDF Image | Geothermal Energy Annual Report 2004
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