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Transient behaviour of salt caverns - Interpretation of mechanical integrity tests
Tightness is a fundamental prerequisite for many underground facilities. Natural gas is stored in aquifers or depleted reservoirs, LPG and compressed air are stored in unlined galleries, and various hydrocarbons, from natural gas to crude oil, are stored in salt caverns. There also are current plans to store nuclear waste and carbon dioxide in deep geological formations. In most cases, small leaks will exist in these formations. Tightness tests performed in underground salt caverns used for storing oil and gas are described and assessed. It is proved that, together with an actual leak, various factors may influence the results of such test, possibly leading to severe misinterpretation. These factors include thermal disequilibrium, brine permeation through cavern walls, additional salt dissolution, and transient creep. Their effects are quantified. Emphasis is put on 'reverse' transient creep. The results of an in situ test, during which most of these effects are active, are discussed.
Transient behaviour of salt caverns - Interpretation of mechanical integrity tests
Tightness is a fundamental prerequisite for many underground facilities. Natural gas is stored in aquifers or depleted reservoirs, LPG and compressed air are stored in unlined galleries, and various hydrocarbons, from natural gas to crude oil, are stored in salt caverns. There also are current plans to store nuclear waste and carbon dioxide in deep geological formations. In most cases, small leaks will exist in these formations. Tightness tests performed in underground salt caverns used for storing oil and gas are described and assessed. It is proved that, together with an actual leak, various factors may influence the results of such test, possibly leading to severe misinterpretation. These factors include thermal disequilibrium, brine permeation through cavern walls, additional salt dissolution, and transient creep. Their effects are quantified. Emphasis is put on 'reverse' transient creep. The results of an in situ test, during which most of these effects are active, are discussed.
Transient behaviour of salt caverns - Interpretation of mechanical integrity tests
Kurzzeitverhalten von Salzkavernen - Interpretation mechanischer Integritätstests
Berest, P. (author) / Brouard, B. (author) / Karimi-Jafari, M. (author) / Sambeek, L.van (author)
International Journal of Rock Mechanics and Mining Sciences ; 44 ; 767-786
2007
20 Seiten, 13 Bilder, 45 Quellen
Article (Journal)
English
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