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The Geodynamics Habanero 1 MW EGS power station (centre), with station air coolers (right) and brine air coolers (left), Cooper Basin, South Australia. The (Photo courtesy of Geodynamics Limited) Some of the procedures that could be standardized are: Well testing models Before stimulation: for the assessment of undisturbed in-situ permeability which can then be compared to that of after stimulation; near wellbore, and if possible, far field For stimulation: for the assessment of the degree of enhanced permeability following stimulation; near wellbore and far field For circulation: for the assessment of the further changes in permeability due to cooling and precipitation and dissolution processes, i.e., is the reservoir improving or degrading; both near and far field Borehole measurements Wellbore images: Wellbore images are necessary to identify joint network and flow exits. Borehole imaging tools such as BHTV, FMI, etc., are commonly used for this purpose. Higher temperatures can make the use of existing tools/methods impractical; although, cooling of wells and use of heat shields can allow them to work for a limited time. Temperature: Temperature is a very important heat resource and flow exit/inlet identification tool. Analogue and digital tools are available to work at up to 200 °C. Higher temperature tools can be attained using heat shield technology. Temperature sensors with low thermal mass are preferable because they respond faster to changes in temperature for identifying small flow exits. The use of optic fibre distributed temperature sensors (DTS) has great potential. Flow: Impeller flow meters are preferred as they are a simpler device and very sensitive to flow. The larger the diameter of the impeller the higher the sensitivity. For higher temperature, the impeller can be made of Teflon and Teflon coated bearings are used to reduce friction and corrosion. Standardised methods for flow measurement and interpretation would be useful. Pressure: High temperature electronics is allowing down-hole measurement of pressure over longer time intervals. DTS methods are also being developed for pressure. 52PDF Image | Geothermal Research and Tech IEA
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