ANALYSIS OF PRODUCTION INJECTION DATA FROM SLIM HOLES AND LARGE-DIAMETER WELLS AT THE KIRISHIMA GEOTHERMAL FIELD, JAPAN
- Key words
- Kirishima, Japan
- Location
- Kirishima, Japan
- Conference
- Stanford Geothermal Workshop
- Year
- 1998
- Session
- FIELD STUDIES
- Language
- English
Full text
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Abstract
A majority of Kirishima boreholes produced from liquid feedzones. Production and injection data from boreholes with liquid feedzones imply that (1) productivity and injectivity indices are more or less equal and (2)
discharge rate of large-diameter wells may be predicted based on test data from slim holes. These conclusions are in agreement with those derived from analyses of similar data from Oguni, Takigami, Sumikawa and
Steamboat Hills Geothermal Fields. Analysis of injection and production data from boreholes with two-phase feedzones from Oguni, Sumikawa and Kirishima Geo-thermal Fields indicates that the two-phase productiv-
ity index is about an order of magnitude smaller than the injectivity index. A wellbore simulator was used to examine the effect of borehole diameter on the discharge capacity of geothermal boreholes with two-phase feedzones.
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