Geothermal Research and Tech IEA

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Geothermal Research and Tech IEA ( geothermal-research-and-tech-iea )

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3.3.2 Task B- Technology Crossover between Hydrothermal and Engineered Geothermal Systems The US Department of Energy continues to fund research projects bridging hydrothermal technology and technology that is more specific to Enhanced Geothermal Systems development. Results of these projects are summarized in ―EGS Program Review‖ (http://www1.eere.energy.gov/geothermal/egs_prog_review.html), and described in the EGS sessions of the GRC (2007) and the SGERW (2007). This task was redefined to encourage cross fertilisation of the established hydrothermal technology to be integrated with the new developments from EGS and to encourage both technologies to benefit from each other‘s knowhow. Recent observations and data have indicated that knowledge gained from the development of EGS on preferential fluid flow direction due to the in-situ stress regime can also be applied to hydrothermal fields to enhance permeability and recover additional energy. This cross fertilisation of the technology is being tested at the existing hydrothermal field (ORMAT) at Desert Peak, near Reno, Nevada, USA. This is funded jointly by the US DOE and ORMAT technologies. A dry well which is was found to be favourably aligned with the local stress field was selected to test the application of EGS knowhow to a hydrothermal field. Preliminary investigation is continuing to characterise the field in detail and stimulations will be carried out once the data has been established. It is anticipated this task may help significantly the sustainability of existing hydrothermal fields, increase the power output and expand the hydrothermal resource. 3.3.3 Task C- Data Acquisition and Processing During 2010 no specific work was conducted within this Task. However, a handbook that facilitates the planning of specific EGS project steps and provides an overview to the state of art of commercially available services, which was completed in 2005: Enhanced Geothermal System Project Management Decision Assistant or EGS-PMDA (see IEA-GIA website under http://www.iea-gia.org/geothermal_information.asp) is still being distributed at a cost only to cover reproduction and postage. Various avenues are being considered to reactivate this Task due to its long-term importance. Both public and private sectors are being contacted to fulfil this important task. The Task is much larger than expected and needs to involve long-term commitment from an organisation that will have to do the archiving and website maintenance. 3.3.4 Task D- Reservoir Evaluation A final report of Task D activities was compiled, made available on CD-Rom and distributed to many IEA-GIA Members in 2006. The final report consists of two sections: ―Circulation and Heat Extraction‖ and ―Monitoring‖. Both sections include the essence of experience and knowledge which has been obtained at the Japanese Hijiori and Ogachi HDR fields. The restructuring of this task has started, and entails defining recognised definitions and a way to process these parameters to suit economic evaluation and site comparison. However, progress is slower than expected due to the demands of the task leaders on other commercial programs. The information is being put together on the topics listed in the previous section on this task. 3.3.5 Task E- Field Studies of EGS Reservoir Performance As stated above, this Task was being re-designed during 2007 and the task has been re-defined and some circulation tests were carried out in 2008/2009. During, and following, the installation of 56

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