Self-Similar Propagation of a Plastic Zone Due to Fluid Injection in a Porous Medium

Alexandre Huynen, Emmanuel Detournay

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationPoromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
EditorsPatrick Dangla, Jean-Michel Pereira, Siavash Ghabezloo, Matthieu Vandamme
PublisherAmerican Society of Civil Engineers (ASCE)
Pages1952-1959
Number of pages8
ISBN (Electronic)9780784480779
DOIs
StatePublished - Jan 1 2017
Event6th Biot Conference on Poromechanics, Poromechanics 2017 - Paris, France
Duration: Jul 9 2017Jul 13 2017

Publication series

NamePoromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics

Other

Other6th Biot Conference on Poromechanics, Poromechanics 2017
Country/TerritoryFrance
CityParis
Period7/9/177/13/17

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