TY  - JOUR
A1  - Farkas, Márton Pál
A1  - Hofmann, Hannes
A1  - Zimmermann, Günter
A1  - Zang, Arno
A1  - Bethmann, Falko
A1  - Meier, Peter
A1  - Cottrell, Mark
A1  - Josephson, Neal
T1  - Hydromechanical analysis of the second hydraulic stimulation in well PX-1 at the Pohang fractured geothermal reservoir, South Korea
JF  - Geothermics : an international journal of geothermal research and its applications
N2  - In this study, we investigate numerically the hydro-mechanical behavior of fractured crystalline rock due to one of the five hydraulic stimulations at the Pohang Enhanced Geothermal site in South Korea. We use the commercial code FracMan (Golder Associates) that enables studying hydro-mechanical coupled processes in fractured media in three dimensions combining the finite element method with a discrete fracture network. The software is used to simulate fluid pressure perturbation at fractures during hydraulic stimulation. Our numerical simulation shows that pressure history matching can be obtained by partitioning the treatment into separate phases. This results in adjusted stress-aperture relationships. The evolution of aperture adjustment implies that the stimulation mechanism could be a combination of hydraulic fracturing and shearing. The simulated extent of the 0.01 MPa overpressure contour at the end of the treatment equals to similar to 180 m around the injection point.
KW  - Enhanced Geothermal System
KW  - Pohang geothermal reservoir
KW  - hydraulic
KW  - stimulation
KW  - PX-1
KW  - FracMan
Y1  - 2021
U6  - https://doi.org/10.1016/j.geothermics.2020.101990
SN  - 0375-6505
SN  - 1879-3576
VL  - 89
PB  - Elsevier
CY  - Amsterdam [u.a.]
ER  -