Storage of natural gas in salt caverns had been developed mainly for seasonal storage, resulting in a small number of yearly pressure cycles and moderate gas-production rates. The needs of energy traders are changing toward more aggressive operational modes. Gas temperature changes and additional stresses generated by high-frequency cycling in a storage cavern are discussed. It is proved that, when short-period gas pressure cycles are performed, the thickness of the thermally disturbed zone at the cavern wall is relatively small. Refined meshes of the disturbed zone are required when performing numerical computations. The case of an actual cavern is discussed. In addition to the Munson-Dawson constitutive law, “reverse” creep is considered. The no-tension and dilation criteria are used to discuss numerical results. It is proved that tensile stresses may develop when cavern pressure is low
MECHANICAL STABILITY OF A CAVERN SUBMITTED TO HIGH-FREQUENCY CYCLES
FRANGI, ATTILIO ALBERTO;
2011-01-01
Abstract
Storage of natural gas in salt caverns had been developed mainly for seasonal storage, resulting in a small number of yearly pressure cycles and moderate gas-production rates. The needs of energy traders are changing toward more aggressive operational modes. Gas temperature changes and additional stresses generated by high-frequency cycling in a storage cavern are discussed. It is proved that, when short-period gas pressure cycles are performed, the thickness of the thermally disturbed zone at the cavern wall is relatively small. Refined meshes of the disturbed zone are required when performing numerical computations. The case of an actual cavern is discussed. In addition to the Munson-Dawson constitutive law, “reverse” creep is considered. The no-tension and dilation criteria are used to discuss numerical results. It is proved that tensile stresses may develop when cavern pressure is lowFile | Dimensione | Formato | |
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Brouard et al - Galveston 2011.pdf
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