A particulate rock model to simulate thermo-mechanical cracks induced in the near well by su-percritical CO2 injection

Mariane Peter-Borie (1) , Arnold Blaisonneau (1) , Sylvie Gentier (1) , Xavier Rachez (1) , Wenjie Shiu (2) , Fabian Dedecker (2)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 Itasca Consultants

In order to study the thermo-mechanical effects induced by the injection of a fluid like CO2 in a host rock whose temperature is higher than those of the fluid, a DEM modeling has been imple-mented based on a "particulate" approach (Particle Flow code - PFC). The methodology devel-oped to build a particle rock model consistent with the rock petrophysical characteristics and the thermo-mechanical behavior is proposed in this paper. The three main steps are described: rock conceptualization (association of rock petrophysical and textural elements with numerical ob-jects), estimating geometrical and physical properties of the rock model from the petrographic characteristics, and finally mechanical and thermo-mechanical calibration. An example of a modeling of drilling mechanical effect and thermo-mechanical effects induced by injection of a cold fluid in a host rock is finally presented.

Mots clés: CO2 storage; particulate model; Rock model; rock texture; TM modeling

Domaines: Planète et Univers [physics]; Sciences de la Terre; Géologie appliquée

Mariane Peter-Borie, Arnold Blaisonneau, Sylvie Gentier, Xavier Rachez, Wenjie Shiu, et al.. A particulate rock model to simulate thermo-mechanical cracks induced in the near well by su-percritical CO2 injection. IAMG 2011 : the Annual Conference of the International Association for Mathematical Geosciences., Sep 2011, Salzburg, Austria. pp.148-531-1. ⟨hal-00609099⟩