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3.1.5 Quantification of stimulated area and heat transfer volume: Both of these parameters are needed to assess the life of an EGS system under operating conditions. This is difficult and still in a development stage. Information from microseismic, tracers, joint network, numerical modelling and geology is used to calculate the heat transfer area and heat transfer volume. Work is continuing on these topics. One of the problems is that there are not enough EGS reservoirs in a circulation mode to carry out experiments to assess and confirm predictions. Tracer studies Selection of tracers: Quite an amount of work has been done on this topic to select the right tracer for a specific task. The work is in the process of being written up. Sampling, breakthrough time and modal volume: Although procedures for specific tests have been established, the interpretation needs to be better defined with the help of numerical models. Heat transfer area: This is a difficult parameter to assess because of the dependence on the nature of the system, i.e., open or closed. Life of a reservoir: This is an important parameter to define the return on investment. Some numerical models are available which rely on the hydraulic, tracer, microseismic and geochemical data but it is difficult to give supporting evidence due to the absence of any circulating EGS system for a prolonged period. Results from task 3.1.5 (below) will be very helpful in defining the procedure and interpretation on this task. Task E- Field Studies of EGS (Task Leaders: J. Muller IFE (Norway) and Co-Leader: Albert Genter, EEIG, France) The objective of Task E is to conduct research and development on working Engineered Geothermal Systems (EGS) with an emphasis on reservoir management and reservoir enhancement technologies. This topic covers a broad area, including fracture and stress analyses, hydraulic and chemical stimulation, and fluid-flow modelling of hydraulic and chemical stimulation processes, tracer technologies and geophysical methods. This is a collaborative task between the originally EC funded European Project at Soultz-sous-Forêts (France) and the IEA-GIA member (Norway) with participation of other members. This project broke much new ground and demonstrated that this technology can be technically feasible and commercially viable. At present, this project is funded and supervised by a European industrial consortium. This task was established and operated as a joint cooperative effort between the EC and USA until 2008, when the EC funding ended. This Task will now become part of a new reservoir management Task, a stage that is only now being reached for EGS systems. This includes scaling, corrosion, dissolution, precipitation, etc. The three EGS systems that were circulated for prolonged periods during early phases of EGS investigations were the Los Alamos, Rosemanowes and Hijiori sites. Some management investigations were carried out at these sites, but they require updating and integration with the limited experience at the Soultz site. 3.2 Review of EGS Field Studies at Soultz in 2008 3.2.1 July-August 2008 Circulation Test The deeper reservoir between wells GPK2 and GPK3 was circulated in July-August 2008 while the power plant was being commissioned. A line shaft pump (LSP) was installed at 350 m depth in GPK2 and GPK4 was shut-in. Following the earlier circulation test in 2005, the injection well GPK3 was subjected to further acid stimulation in 2007 to improve permeability, but without 54PDF Image | Geothermal Research and Tech IEA
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