Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2007-10-30
2011-12-20
Nghiem, Michael (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C702S006000, C702S042000, C702S130000, C175S011000, C175S017000, C175S050000, C324S324000, C324S347000, C166S250010, C166S259000
Reexamination Certificate
active
08082105
ABSTRACT:
Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole, cooling a wall of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point.
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International Search Report: PCT/KR2007/005396.
Choi Byung-Hee
John Loui Porathur
Ryu Chang-Ha
Ryu Dong-Woo
Synn Jung-Ho
Korea Institute of Geoscience and Mineral Resources (KIGAM)
Ladas & Parry LLP
Nghiem Michael
Ngon Ricky
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