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II. IEA GEOTHERMAL R&T PROGRAMME ANNEX VII 5.5 Subtasks Annex VII has three Subtasks, described below. As specified in the Annex VII Charter, all Participants in the Annex are considered to participate in all Subtasks. 5.2.1 Subtask A- Compile Geothermal Well Drilling Cost and Performance Information (Subtask Leader: Previously Japan, now withdrawn from Annex VII. To be determined.) This activity is a compilation of actual drilling cost and performance results associated with the development, construction and operation of geothermal wells. This information will be maintained in a single database, so that all participants can use it to identify key drilling operations that might be improved by new technology or by different drilling practices. It will include information on wells for both electricity and direct-use applications (including geothermal heat pumps), and will include information from 1990 to date. The overall perception is that this Subtask suffers from a lack of cost and performance data. Another issue concerned the specification of how shared data will be used so as to allay company concerns about the release of proprietary information. Perhaps these situations could be alleviated through a better demonstration of the value that this information can provide to industrial donors – if shared and explained in a manner to accomplish mutual benefit. For example, we can compile individual well cost data to determine where the major costs drivers are (Figure 5.2) by reviewing cost breakdown and, for example, reviewing flat time events (Figure 5.3) to develop remedy and prevention scenarios Figure 5.2 Cost breakdown in a sample well. 5.2.2 Subtask B- Geothermal Drilling Best Practices Handbook (Co-Subtask Leaders: High Temperature Drilling: Jaime Vaca, Comisión Federal de Electridad (CFE), Mexico; Low Temperature Drilling: Sverrir Thorhallsson, Orkustofnun (OS), Iceland) The participants plan to identify and catalogue the technologies that have been most successful for drilling, logging and completing geothermal wells. A complete Handbook will contain drilling practices for both direct use (low temperature) and electrical generation (high temperature) wells. The complete Handbook will eventually include, but not be limited to IEA Geothermal R&T Annual Report 2004.doc 36PDF Image | Geothermal Energy Annual Report 2004
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