Geometrical versus rheological transient creep closure in a salt cavern

Pierre Bérest; Mehdi Karimi-Jafari; Benoît Brouard

doi:10.1016/j.crme.2017.09.002

Geometrical versus rheological transient creep closure in a salt cavern

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

Comptes Rendus. Mécanique, Volume 345 (2017) no. 11, pp. 735-741.

Abstract

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.

Received: 2017-06-27
Accepted: 2017-09-04
Published online: 2017-09-28

DOI: 10.1016/j.crme.2017.09.002

Keywords: Creep, Reverse creep, Salt caverns, In situ tests

Author's affiliations:

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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     author = {Pierre B\'erest and Mehdi Karimi-Jafari and Beno{\^\i}t Brouard},
     title = {Geometrical versus rheological transient creep closure in a salt cavern},
     journal = {Comptes Rendus. M\'ecanique},
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     language = {en},
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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/

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Cited by

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