TY - GEN
T1 - Effect of system compliance on pressure-time curve at reopening and new standard in Japan
AU - Ito, T.
AU - Yokoyama, T.
N1 - Funding Information:
The authors wish to thank the plenty of discussion on the issue of reopening pressure measurement by members of the WG in the Japanese Geotechnical Society (JGS), which has been established in 2013 for standardization of the method for initial stress measurement by hydraulic fracturing technique.
Publisher Copyright:
© 2021 ARMA, American Rock Mechanics Association
PY - 2021
Y1 - 2021
N2 - Hydraulic fracturing (HF) is only one method which has been standardized so far as a method of in-situ stress measurement available at depths more than 50 m. The maximum and minimum stresses in a plane perpendicular to a borehole is estimated by combining the reopening pressure and the shut-in pressure observed in the HF test carried out in the borehole. Increased applications of the method have clarified a strange phenomenon not consistent with the theory on the relationship between the reopening pressure and the in-situ stresses. The studies on the phenomenon have found that it was resulted from the facts ignored in the conventional theory, which are a residual aperture of fracture and hydraulic compliance of the test system. Based on the results, it has been becoming more general at least in Japan to apply the HF method improved considering the effects of (i) the residual aperture on the relationship between the reopening pressure and the in-situ stresses and (ii) the system compliance on the borehole pressure variation due to fracture reopening.
AB - Hydraulic fracturing (HF) is only one method which has been standardized so far as a method of in-situ stress measurement available at depths more than 50 m. The maximum and minimum stresses in a plane perpendicular to a borehole is estimated by combining the reopening pressure and the shut-in pressure observed in the HF test carried out in the borehole. Increased applications of the method have clarified a strange phenomenon not consistent with the theory on the relationship between the reopening pressure and the in-situ stresses. The studies on the phenomenon have found that it was resulted from the facts ignored in the conventional theory, which are a residual aperture of fracture and hydraulic compliance of the test system. Based on the results, it has been becoming more general at least in Japan to apply the HF method improved considering the effects of (i) the residual aperture on the relationship between the reopening pressure and the in-situ stresses and (ii) the system compliance on the borehole pressure variation due to fracture reopening.
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M3 - Conference contribution
AN - SCOPUS:85123055465
T3 - 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
BT - 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
PB - American Rock Mechanics Association (ARMA)
T2 - 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
Y2 - 18 June 2021 through 25 June 2021
ER -