Analysis in Preparation for Hijiori Long Term Circulation Test
- Key words
- Hijiori
- Location
- Hijiori, Japan
- Conference
- World Geothermal Congress
- Year
- 2000
- Session
- Advanced Technologies (HDR, Magma, Geopressure)
- Language
- English
- Paper number
- R0441
Full text
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Abstract
In preparation for the Long Term Circulation Test (LTCT) at the Hijiori geothermal reservoir, analyses have been completed to evaluate different operating strategies. Seven cases are discussed, including different injection rates in the same configuration as the 1995-1996 testing, blocking the lower production of HDR-2a, and the user of down hole pumps.
The analyses were performed using ERLF98 and Geocrack2D. WELF98 is a well bore flow simulator that is used to determine flows in individual fractures by matching Pressure Temperature Spinner (PTS) data. The Geocrack2D finite element code was developed to solve coupled thermo-hydro-mechanical problems where the floe is on fractures. The models were validated by analyzing 1991-1996 testing and match the measured data. Bases on the LTCT analyses, it is expected that although cooling will occur during the tow years of testing, the mixed production temperatures will remain sufficiently high for a successful test. Work is proceeding on 3D analyses.
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