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Diagram of a drilling platform. engines mud transfer pump derrick storage place for drill pipes square profile pin rotary table sieve mud container cement drill pipes drill bit shutter Electricity can also be generated using resources at temperatures of between 100 °C and 160 °C. In this case, the geo- thermal fluid transfers its calories inside an exchanger containing an organic liquid that has a low flashpoint and in which the vapour activates a turbine; the organic liquid circulates in a closed circuit between the geothermal exchanger and a conden- ser.This technology is referred to as binary fluid or ORC (Organic Rankine Cycle) technology. Project Development stages The implementation of a generic project to develop a geothermal resource for the generation of electricity consists of the following stages: 1 - Preliminary reconnaissance: this stage involves using geological data to select areas propitious to the existence of geo- thermal resources within a given territory. 2 - Execution of pre-feasibility studies: the purpose of these studies is to reveal the existence of geothermal resources within areas identified as being potentially favourable. 3 - Drilling of exploratory boreholes: exploratory boreholes are intended to Geothermal development project on Dominica – BRGM/CFG Services The island of Dominica in the West Indies possesses a significant geothermal potential for the generation of electricity, which was recognised during the first explorations of the Wotten-Waven field carried out by BRGM in the 1980s. In the framework of projects funded by the Organisation of American States (“Geo- Caribbean” Project) and by the European Union (Caribbean Geothermal” project, coordinated by the Guadeloupe Region) between 2005 and 2010, CFG Services and the BRGM, associated with ADEME, carried out the pre-feasibility study for a geother- mal power plant project with a capacity of 120 MW, which aims to cover the electricity needs of Dominica and to export any surplus to Guadeloupe and Martinique via undersea cables. The study included geological exploration, geochemical and geophysical activities, the creation of a preliminary field model and the selection of sites conducive to the drilling of three exploratory boreholes, the preliminary design of the production units, updating of the economic assessment, including the interconnection cost and an environmental pre-feasibility assessment. The prospects for this project are remarkable from an environmental point of view. It is also promising in terms of regional cooperation and economic development for these Caribbean islands, all the more so given that the three exploratory boreholes drilled at the end of 2011 and at the start of 2012 under the management of the AFD confirmed the findings of previous studies and the presence of a high-temperature resource. A new project entitled “Géothermie Caraîbe – Phase 2” (Caribbean Geothermal – Phase 2), coordinated by the Guadeloupe Region and ADEME in association with the Martinique Region, BRGM, AFD, the French Consignments and Loans Fund and Électricité de Strasbourg, is currently being launched. Its aim is to prepare a develop- ment plan for geothermal energy with the appropriate tools on a Caribbean scale in order to create the required cumulative effect. Adapting the most recent oil exploration techniques to high-energy geothermal power – Teranov Since the end of 2010,Teranov has undertaken an operational research program that consists in adapting the most recent oil exploration techniques to high geothermal energy.The aim is to propose a range of services for public or private developers by developing an integrated tool that optimizes exploration costs and allows the related financial risk to be assessed more accurately.The format and accuracy of this tool should be equal to those of tools commonly used by investors in mines and industries. To complete this research programme successfully, Teranov is working in close collaboration with the most reputable para-petroleum service companies.This service offering should allowTeranov to access the flourishing high-energy geothermal power markets in the Caribbean region and Latin America. confirm the existence of a geothermal reservoir and to assess its characteristics (depth, extent, permeability and proper- ties of the existing geothermal fluid). In the absence of positive results, the project may be abandoned at this stage. 4 - Exploitation of the geothermal reser- voir with the execution of the complete electricity generation project (feasibility study, drilling of exploratory boreholes and construction of surface facilities including the power plant). French know-how in the field of geothermal energy 12 / 13 © ADEME - BRGM © Laurent Mignaux – METL - MEDDEPDF Image | GEOTHERMAL ENERGY District heating
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