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Geothermal drilling cost reduction can take many forms, e.g., faster drilling rates, increased bit or tool life, less trouble (twist-offs, stuck pipe, etc.), higher per-well production through multi-laterals, and others. Activities in the Advanced Geothermal Drilling and Logging Technologies Task will address aspects of geothermal well construction, which include: 1) Developing a detailed understanding of worldwide geothermal drilling costs; 2) Compiling a directory of geothermal drilling practices and how they vary across the globe; and 3) Developing improved drilling and logging technologies. The objectives of Advanced Geothermal Drilling and Logging Technologies are: 1. Quantitatively understand geothermal drilling costs from around the world and identify ways to reduce those costs, while maintaining or enhancing productivity. 2. Identify and develop new and improved technologies for significantly reducing the cost of geothermal well construction to lower the cost of electricity and/or heat produced with geothermal resources. 3. Inform the international geothermal community about these drilling technologies. 4. Provide a vehicle for international cooperation, field tests, etc. toward the development and demonstration of improved geothermal drilling and logging technologies. Annex VII of the Geothermal Implementing Agreement has been developed to pursue advanced geothermal drilling and logging research that will address all aspects of geothermal well construction. Participants in this Annex are: Australia, Mexico, Iceland, the European Commission, New Zealand, and the United States. Sandia National Laboratories (USA) is the Operating Agent for Annex VII. Stephen Bauer, of Sandia National Laboratories, is Task Leader. 4.1 Tasks of Annex VII Annex VII has three Tasks, described below. As specified in the Annex VII Charter, all Participants in the Annex are considered to participate in all Tasks. 4.1.1 Task A- Compile Geothermal Well Drilling Cost and Performance Information (Task Leader: Stephen Bauer, Sandia National Laboratories (SNL), USA) This activity is a compilation of drilling cost information associated with the development, construction and operation of geothermal wells. This information/data will be maintained in a single database, so that all participants can use it to identify key cost components that might be reduced by new technology or by different drilling practices. Data could include R&D cost, project cost, operation and maintenance cost, and overall cost of energy. 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 key modification sought in this time period, based on the realization that operators do not want to openly share costs, is to collect depth-time data, from which, performance may be estimated. 59PDF Image | Geothermal Research and Tech IEA
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