TY - GEN
T1 - Self-Similar Propagation of a Plastic Zone Due to Fluid Injection in a Porous Medium
AU - Huynen, Alexandre
AU - Detournay, Emmanuel
PY - 2017/1/1
Y1 - 2017/1/1
N2 - This paper investigates the propagation of a plastic zone resulting from fluid injection in a weakly consolidated porous medium with dilatant behavior. It is assumed that the rock behaves as a Mohr-Coulomb elasto-plastic material with different mobility and diffusivity depending on whether it is elastic or yielding. More specifically, the plane strain problem of a point source injecting fluid, at constant rate, in an infinite domain is considered. Under these assumptions, the absence of any characteristic length implies the existence of a self-similar solution. It is shown that this solution consists of a plastic zone growing as the square root of time and is characterised by a constant pore pressure at the elasto-plastic boundary. Depending on the magnitude of the injection rate, three yielding regimes exists. Finally, the paper concludes by investigating the conditions under which a tensile fracture could initate in the vicinity of the injection point.
AB - This paper investigates the propagation of a plastic zone resulting from fluid injection in a weakly consolidated porous medium with dilatant behavior. It is assumed that the rock behaves as a Mohr-Coulomb elasto-plastic material with different mobility and diffusivity depending on whether it is elastic or yielding. More specifically, the plane strain problem of a point source injecting fluid, at constant rate, in an infinite domain is considered. Under these assumptions, the absence of any characteristic length implies the existence of a self-similar solution. It is shown that this solution consists of a plastic zone growing as the square root of time and is characterised by a constant pore pressure at the elasto-plastic boundary. Depending on the magnitude of the injection rate, three yielding regimes exists. Finally, the paper concludes by investigating the conditions under which a tensile fracture could initate in the vicinity of the injection point.
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U2 - 10.1061/9780784480779.242
DO - 10.1061/9780784480779.242
M3 - Conference contribution
AN - SCOPUS:85026306532
T3 - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
SP - 1952
EP - 1959
BT - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
A2 - Dangla, Patrick
A2 - Pereira, Jean-Michel
A2 - Ghabezloo, Siavash
A2 - Vandamme, Matthieu
PB - American Society of Civil Engineers (ASCE)
T2 - 6th Biot Conference on Poromechanics, Poromechanics 2017
Y2 - 9 July 2017 through 13 July 2017
ER -