FREAパンフレット（英語）

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Number of spinner revolutions (flow rate in a well) (rps)After water injectionBefore water injectionBefore water injectionDepth of excavation (m)15P.6P.8P.10P.12P.16Hydrogen Energy Carrier TeamWind Power TeamPhotovoltaic Power TeamGeothermal Energy TeamShallow Geothermal and Hydrogeology TeamEnergy Network TeamP.16ShallowGeothermal andHydrogeologyTeamP.6P.8P.10P.12Hydrogen Energy Carrier TeamWind Power TeamPhotovoltaic Power TeamEnergy Network TeamThe device simulates a hot spring pipeline in the laboratory for evaluating hot spring monitoring sensors and conducting experiments on hot spring Examination device for hot spring systemThis facility enables the simulation of various mechanical phenomena in geothermal reservoirs under high temperature and pressure.Experimental facility for shear slip of a fractureThis facility is capable of simulating 350°C, 60 MPa borehole conditions.Activities and AchievementsMain Research FacilitiesIn order to prevent a decrease in steam production and to recover production, water-recharge injection tests have been conducted at the Yanaizu-Nishiyama Geothermal Power Plant in Fukushima Prefecture since FY2015. In this area, the Geothermal Energy Team installed a precision microearthquake remote monitor-ing network using a three-component downhole accelerometer for a geothermal well and other equipment, and operations were commenced. This enables real-time monitoring of microearthquake activity and advanced integrated analysis in FREA, and our plan is to contribute to production recovery through appropriate water injection.Yanaizu-Nishiyama Geothermal Power Plant(Photo courtesy of Tohoku Electric Power Co., Inc.)Installation status of three component seismometersMicroearthquake data integration and visualization system (monitoring the behavior of the injected water)1) Development of simulator for water injection to a geothermal wellIn some cases, the capacity of a geothermal reservoir is improved by injecting water into the reservoir through a geothermal well. The Geothermal Energy Team collaborated with US and European researchers and developed a simulator for investigating the response to a crack for water injection. As a result of conducting a demonstration test on a well with reduced capacity in a geothermal eld of the Tohoku region, the team boosted capacity as predicted by the simulation and succeeded in increasing the power generation (to about 1.1 MW).2) Development of a remote and continuous system for monitoring a hot spring’s qualityThe team began developing a system for measuring a hot spring’s qualities including the temperature, ow rate, electric conductivity, etc., producing a prototype to scientically explain the relationship between geothermal power generation and hot springs. This system enables stand-alone measurements and continuously transfers the obtained data to a server through the Internet. The performance evaluations by laboratory experiments and eld demonstration tests for practical application will continue to the end of FY2017.Simulation of a subsurface crackResults of a water injection testExperimental facility for the development of borehole tools for high-temperature and high-pressure geothermal wells