Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.geothermics.2021.102334
Title (Primary) Wellbore stability in high-temperature granite under true triaxial stress
Author Goto, R.; Sakaguchi, K.; Parisio, F.; Yoshioka, K.; Pramudyo, E.; Watanabe, N.
Journal Geothermics
Year 2022
Department ENVINF
Volume 100
Page From art. 102334
Language englisch
Topic T8 Georesources
Keywords Wellbore failure; Granite; High temperature; Supercritical geothermal environment; Superhot geothermal environment; True triaxial stress; AE; acoustic emissions
Abstract Supercritical/superhot geothermal success depends on successful drilling. However, wellbore stability in supercritical environments has not been investigated because imposing sufficient stress on high-temperature granite with true triaxial loading is difficult. We conducted wellbore failure experiments on 200–450 °C granite under true triaxial stress, including deformation and acoustic emission measurements, and post-experiment thin section observations. Wellbore failure initiated at stress states consistent with existing brittle failure criterion at the studied temperatures. Using breakout geometry for in situ stress estimation may be difficult as shear failure propagation is suppressed at high temperatures; however, boreholes may be inherently stable in high-temperature environments.
Persistent UFZ Identifier
Goto, R., Sakaguchi, K., Parisio, F., Yoshioka, K., Pramudyo, E., Watanabe, N. (2022):
Wellbore stability in high-temperature granite under true triaxial stress
Geothermics 100 , art. 102334