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Geothermal Research and Tech IEA

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

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This task is also aimed to modify conventional hydrothermal development technologies, such as horizontal drilling, fracture detecting and mapping, and pumping, for application to EGS energy development. Discussions are continuing to see what is feasible within existing budgets. This cross fertilisation of technologies is being tested at an existing hydrothermal field (ORMAT) at Desert Peak, near Reno, Nevada, USA. It is anticipated this task may significantly help the sustainability of existing hydrothermal fields, increase the power output and expand the hydrothermal resource. 3.1.3 Task C- Data Acquisition and Processing (Task Leader: To be selected and appointed; Germany) Task C involves the collection of information necessary for the realization of a commercial EGS energy producing plant at each stage of reservoir characterization, design and development, and of construction and operation. Access to past data and reports from various projects has always been difficult. The US DoE developed the ―Legacy Project‖, which provides access to some of the reports from previous EGS projects. This scheme needs reinforcing with the addition of missing reports and a better search engine (refinement of the existing one, or its replacement). Alterative means are being considered to address this data and information access problem, such as via financial support from the GIA Common Fund, or the full program being funded by an organisation, joint consortium of partners, etc. Access to all the data is still a serious problem, as some of it will have been lost or be regarded as confidential. The data which is available, should to be accessible to anyone who wishes to work on it, gain from the past experience, or develop new interpretation methods. Such data may be divided into four categories:  In-situ data: geology, stress profile, temperature with depth, in-situ fluid composition and pressure, joint network and orientation, etc.  Hydraulic data: all hydraulic testing, stimulations and circulations of wells  Microseismic data: both located events and raw data  Reports and papers Such a data base with international aspect is difficult and complex to implement as it is not just the translation from various languages to a common recognised such as English, but also the format of the database and the search engine associated with it to deliver the result. There are approximately 20 old EGS projects (Japan: 4, Europe: 10, USA: 3, Australia: 3). The provisional Task leader is Roy Baria until a suitable organisation can be found in Germany that is prepared to take on this task and maintain it for a foreseeable future. 3.1.4 Task D- Reservoir Evaluation (Task Leader: Doone Wyborn, Geodynamics Limited, Australia) The overall objective of Task D is to compile and make clear what kind of methods, techniques, and tools are effective for reservoir evaluation; and then establish the evaluation methods best applied to develop a new EGS site. Creation of an economically viable reservoir is the single most important item in EGS technology. Methods used for evaluation of the data have developed from past EGS projects and others are borrowed from the oil and gas industry and nuclear waste disposal research. The plan is to define agreed procedures to test and evaluate the reservoir parameters so that they can be compared. Some of the parameters have been defined for discussion and are presented below. The work has progressed slowly but additional support is being considered and investigated. 51

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