Hydraulic fracturing stress measurement was performed by using a 30m-deep well drilled in the Kamaishi iron mine. Eight transverse cracks crossing the well obliquely were obtained. By re-plotting the shut-in curves, i.e., the pressure-time records after shut-in, into dT/dP vs. P plots (T: time, P: wellbore pressure), shut-in pressure was determined objectively. By using the shut-in pressure of the eight transverse cracks, three-dimensional stress field was evaluated based on the assumption that the shut-in pressure of a transverse crack gave a good estimate of the magnitude of the normal stress acting perpendicularly to the crack. Finally, the reliability of the evaluated stress field is discussed.
|Number of pages||7|
|Journal||International Journal of Rock Mechanics and Mining Sciences and|
|Publication status||Published - 1993 Dec|
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology