Analysis of Pulse Tests in a Fractured Geothermal Reservoir - A Case Study at the Sumikawa Field in Japan
- Key words
- Pressure interference, Pulse test, Fracture, Sumikawa
- Location
- Sumikawa, Japan; Sengan Geothermal Area
- Conference
- World Geothermal Congress
- Year
- 2005
- Session
- 11. Reservoir Engineering
- Language
- English
- Paper number
- 1137
Full text
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Abstract
Pulse testing is one of the standard well test methods to evaluate complicated reservoir features. In this paper, a simplified analysis method of pulse testing is presented. It appears to be possible to predict whether a reservoir medium between two wells is porous or fractured, when hydraulic diffusivity of several different pulse flow-rate periods can be estimated from time lags of pressure interference at an observation well. It may be also possible to provide additional information for average fracture spacing. Examples of pressure interference data observed at the Sumikawa geothermal field in Japan is presented to discuss a simplified analysis method of pulse tests.
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