Wells – Processes – With indicating – testing – measuring or locating
Patent
1986-08-14
1987-05-19
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
73784, 166308, E21B 4326, E21B 4702, E21B 4706
Patent
active
046659846
ABSTRACT:
Earth's crustal stress is measured by drilling a bore-hole in rock body, producing a longitudinal crack at a selected portion thereof with or without a natural traverse crack through intermittent application of hydraulic pressure thereat while measuring the pressure at different stages of crack production, producing an artificial traverse cracks through the use of a prenotch, determining orientations of the cracks thus produced by inspecting the bore-hole surface conditions, and numerically analyzing the crack orientations and the pressures at different stages of crack production.
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Abe Hiroyuki
Hayashi Kazuo
Niitsuma Hiroaki
Shoji Tetsuo
Takahashi Hideaki
Novosad Stephen J.
Tohoku University
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