Comptes Rendus
no. 11
Geometrical versus rheological transient creep closure in a salt cavern
Pierre Bérest1  ; Mehdi Karimi-Jafari1  ; Benoît Brouard2
1 Laboratoire de mécanique des solides, École polytechnique, route de Saclay, 91128 Palaiseau cedex, France
2 Brouard Consulting, 101, rue du Temple, 75003 Paris, France
Comptes Rendus. Mécanique, Volume 345 (2017) no. 11, pp. 735-741.

An in-situ test performed in a brine-filled cavern proves that, when brine pressure decreases rapidly, the creep closure rate increases drastically. Conversely, a rapid pressure increase leads to “reverse” creep closure: cavern volume increases, even when, at cavern depth, fluid pressure is lower than geostatic pressure. It is tempting to explain these two phenomena by transient salt creep, a characteristic feature of salt rheological behavior commonly observed during laboratory creep tests. In fact, computations performed on an idealized cylindrical cavern excavated from a Norton–Hoff rock mass (a constitutive law that includes no transient component) prove that these two phenomena are, at least partly, of a structural nature: their origin is in the slow redistribution of stresses following any pressure change.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2017.09.002
Mots clés : Creep, Reverse creep, Salt caverns, In situ tests
Pierre Bérest 1 ; Mehdi Karimi-Jafari 1 ; Benoît Brouard 2

1 Laboratoire de mécanique des solides, École polytechnique, route de Saclay, 91128 Palaiseau cedex, France
2 Brouard Consulting, 101, rue du Temple, 75003 Paris, France 
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Pierre Bérest; Mehdi Karimi-Jafari; Benoît Brouard. Geometrical versus rheological transient creep closure in a salt cavern. Comptes Rendus. Mécanique, Volume 345 (2017) no. 11, pp. 735-741. doi : 10.1016/j.crme.2017.09.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.09.002/

[1] B. Hugout Mechanical behavior of salt cavities – in situ tests – model for calculating the cavity volume evolution (H.R. Hardy; M. Langer, eds.), Proceedings of the Second Conference on the Mechanical Behavior of Salt, Trans Tech Publications, Clausthal-Zellerfeld, Germany, 1988

[2] P. Bérest; B. Brouard; M. Karimi-Jafari; L. Van Sambeek Transient behavior of salt caverns. Interpretation of mechanical integrity tests, Int. J. Rock Mech. Min. Sci., Volume 44 (2007), pp. 767-786

[3] U. Hunsche Measurement of creep in rock salt at small strain rates (N.D. Cristescu; H.R. Hardy; R.O. Simionescu, eds.), Proceedings of the Fifth Conference on the Mechanical Behavior of Salt, Trans Tech Publications, Clausthal-Zellerfeld, Germany, 1999

[4] D.E. Munson; K.L. De Vries; A.F. Fossum; G.D. Callahan Extension of the Munson–Dawson model for treating stress drops in salt (M. Ghoreychi; P. Bérest; H.R. Hardy; M. Langer, eds.), Proceedings of the Third Conference on the Mechanical Behavior of Salt, Trans Tech Publications, Clausthal-Zellerfeld, Germany, 1996

[5] P. Bérest; B. Brouard Geometrical and rheological creep in salt caverns (L. Roberts; K. Mellegard; F. Hansen, eds.), The Mechanical Behavior of Salt VIII, Taylor & Francis Group, London, 2015, pp. 199-208

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