Geometrical versus rheological transient creep closure in a salt cavern - 01/12/17
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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.
Le texte complet de cet article est disponible en PDF.Keywords : Creep, Reverse creep, Salt caverns, In situ tests
Plan
Vol 345 - N° 11
P. 735-741 - novembre 2017 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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