Fracture Toughness Evaluation of Rocks in the Presence of Pressurized Water at Elevated Temperature

Takahashi, Hideaki

doi:10.1007/978-94-009-6884-4_18

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1983

2021

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Cited by 3 publications

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“…A fracture mechanics study on fracturing behavior of a rock mass [5] [6] has shown a decrease of fracture toughness and subcritical crack growth in a rock mass in elevated 357 temperature hot-water environment.…”

Section: Introductionmentioning

confidence: 99%

In-Situ AE Measurement of Hydraulic Fracturing at Geothermal Fields

Niitsuma

Nakatsuka

Takahashi

et al. 1983

Hydraulic Fracturing and Geothermal Energy

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A triaxial acceleration-sense down-hole AE measurement system was developed and successfully applied to the monitoring of both man-made and natural hydraulic fracture in a geothermal field. The accelerationsense instrumentation allows long-distance measurement of subsurface crack extension.AE events during hydraulic fracturing in Nigorikawa geothermal field could be detected at a distance of l600m from the AE source. AE events during a closure operation of a well-head valve in the Kakkonda geothermal field could also be detected by the system. In this paper, the feasibility of the simple measurement system for in-situ monitoring of subsurface crack extension in a geothermal field is demonstrated with reference to the fracture mechanics model of a geothermal reservoir.

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Section: Introductionmentioning

confidence: 99%