Paper published in a book (Scientific congresses and symposiums)
Suction and time effects on the behaviour of a reservoir chalk
Priol, Grégoire; De Gennaro, Vincenzo; Delage, Pierreet al.
2006 • In Van Cotthem, Alain; Charlier, Robert; Thimus, Jean-François (Eds.) EUROCK 2006 - Multiphysics Coupling and Long Term Behaviour in Rock Mechanics
[en] Oil reservoir rocks contain various immiscible fluids (oil, water and gas) and they are submitted to elevated temperatures in the oilfield. Hence, they exhibit a typical coupled behaviour where multiphysics and coupled Thermo-Hydro-Mechanical aspects are predominant. This paper presents some results from researches carried out within the PASACHALK 2 European funded collaborative research. In this research dedicated to subsidence problems in the North sea Ekofisk oilfield, the behaviour of a reservoir chalk containing two immiscible fluids (an organic non polar fluid and water) is considered within the framework of the mechanics of unsaturated soils (no temperature effects considered). In order to account for the mechanical coupled effects related to the two pore fluids, the oil-water suction was considered as an independent stress variable. The paper presents some experimental results describing the combined effect of suction and time on the isotropic compression behaviour of the chalk. A viscoelastoplastic constitutive model based on one hand on the Barcelona BBM elastoplastic model for unsaturated and on the other hand on Perzina’s approach of viscous behaviour of soils is also presented and validated against experimental evidence.
Disciplines :
Civil engineering
Author, co-author :
Priol, Grégoire; Ecole Nationale des Ponts et Chaussées > Institut Navier > CERMES
De Gennaro, Vincenzo; Ecole Nationale des Ponts et Chaussées > Institut Navier > CERMES
Delage, Pierre; Ecole Nationale des Ponts et Chaussées > Institut Navier > CERMES
Collin, Frédéric ; Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur
Charlier, Robert ; Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur
Language :
English
Title :
Suction and time effects on the behaviour of a reservoir chalk
Publication date :
2006
Event name :
EUROCK 2006
Event place :
Liège, Belgium
Event date :
9 - 12 May 2006
Audience :
International
Main work title :
EUROCK 2006 - Multiphysics Coupling and Long Term Behaviour in Rock Mechanics
Editor :
Van Cotthem, Alain
Charlier, Robert ; Université de Liège - ULiège > Département ArGEnCo
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