Abstract
Acoustic emissions (AE) during a massive hydraulic fracturing experiment in a geothermal production well in Nigorikawa field, Hokkaido, Japan, were measured using an acceleration sensitive downhole AE sonde installed in a 30 m well. Crack extensions at a depth of 1500 m were detected and characterized by long-distance AE measurements. The mechanism by which productivity was increased in the geothermal well through hydraulic fracturing has been represented by a model based on AE data and geological considerations.
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