A Case History of a Multi-Well Interference Test Program at the Uenotai Geothermal Field, Akita Prefecture, Japan
- Key words
- Reservoir Engineering; Japan; Akita; Uenotai; Buildup Tests; Injection Test; Interference; Lip Pressure Method; PTS; Permeability; Storativity
- Location
- Uenotai, Japan
- Conference
- Geothermal Resources Council Transactions
- Year
- 1990
- Session
- Well testing; Interference testing; Flow testing; Pressure t
- Language
- English
Abstract
A multi well interference test was conducted in the Uenotai geothermal field from August to December 1988. The test involved eight production, two injection and five observation wells. Analysis of the collected data indicate that the eight production wells have a combined output of 26.1 MW. Pressure drawdown into wells is as high as 120 ksc and this caused some of the wells to produce superheated steam. The high drawdowns, high injection pressures and relatively low reservoir transmissivities calculated from pressure buildup tests suggest the reservoir has low intrinsic permeability. The interference data has been analyzed using both analytical and numerical models. The analytical modeling suggests higher transmissivities than obtained form the pressure buildup tests but the analysis is strongly affected by assumptions on reservoir fluid properties. The numerical modeling gives results consistent with the pressure buildup results.
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