ABSTRACT: AE (Acoustic emissions) were monitored during in-situ hydraulic fracturing stress measurements using a borehole sonde. At a monitoring point, the time interval between the peak pressure and the start of AE occurrence became longer with repetition of the reopening procedure. This phenomenon was most likely due to the crack extension growing deeper from the borehole wall. At another point, during a re-open procedure, two AE bursts were recorded. The pressure at the end of the first burst corresponds to the reopening pressure, while that at the start of the second burst corresponds to the shut-in pressure. Both pressure magnitudes were consistent with those determined using a conventional method employing pressure-time records. These results indicate that AE monitoring could be used to observe behavior of a hydraulically induced crack and could help to improve reliability and accuracy of hydraulic fracturing stress measurements.
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4th North American Rock Mechanics Symposium
July 31–August 3, 2000
Seattle, Washington
ISBN:
9058091554
Borehole AE Monitoring During In-Situ Hydraulic Fracturing Stress Measurements
Yoshiki Nakayama;
Yoshiki Nakayama
Nihon Public Company Incorporated
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Masahiro Tanaka;
Masahiro Tanaka
Nihon Public Company Incorporated
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Hitoshi Nishimura;
Hitoshi Nishimura
Chubu Electric Power Company Incorporated
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Minoru Ueda;
Minoru Ueda
Chubu Electric Power Company Incorporated
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Yoshiaki Mizuta
Yoshiaki Mizuta
Yamaguchi University
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Paper presented at the 4th North American Rock Mechanics Symposium, Seattle, Washington, July 2000.
Paper Number:
ARMA-2000-1113
Published:
July 31 2000
Citation
Nakayama, Yoshiki, Tanaka, Masahiro, Nishimura, Hitoshi, Ueda, Minoru, Ishida, Tsuyoshi, and Yoshiaki Mizuta. "Borehole AE Monitoring During In-Situ Hydraulic Fracturing Stress Measurements." Paper presented at the 4th North American Rock Mechanics Symposium, Seattle, Washington, July 2000.
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