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Accession Number
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DE2012-1038187
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Title
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Interface Modeling to Predict Well Casing Damage for Big Hill Strategic Petroleum Reserve.
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Publication Date
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Feb 2012
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Media Count
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49p
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Personal Author
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B. L. Ehgartner B. Y. Park
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Abstract
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Oil leaks were found in well casings of Caverns 105 and 109 at the Big Hill Strategic Petroleum Reserve site. According to the field observations, two instances of casing damage occurred at the depth of the interface between the caprock and top of salt. This damage could be caused by interface movement induced by cavern volume closure due to salt creep. A three dimensional finite element model, which allows each cavern to be configured individually, was constructed to investigate shear and vertical displacements across each interface. The model contains interfaces between each lithology and a shear zone to examine the interface behavior in a realistic manner. This analysis results indicate that the casings of Caverns 105 and 109 failed by shear stress that exceeded shear strength due to the horizontal movement of the top of salt relative to the caprock, and tensile stress due to the downward movement of the top of salt from the caprock, respectively. The casings of Caverns 101, 110, 111 and 114, located at the far ends of the field, are predicted to be failed by shear stress in the near future. The casings of inmost Caverns 107 and 108 are predicted to be failed by tensile stress in the near future.
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Keywords
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Closures
Creep
Damage
Lithology
Oil leaks
Petroleum
Salt caverns
Shear
Shear properties
Strategic petroleum reserve
Well casings
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Source Agency
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Technical Information Center Oak Ridge Tennessee
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NTIS Subject Category
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97K - Fuels
97A - Reserves
48F - Geology & Geophysics
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Corporate Author
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Sandia National Labs., Albuquerque, NM.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1220
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Contract Number
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DE-AC04-94AL85000
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