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Title: Interface modeling to predict well casing damage for big hill strategic petroleum reserve.

Abstract

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 bymore » tensile stress in the near future.« less

Authors:
;
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
1038187
Report Number(s):
SAND2012-1206
TRN: US201208%%568
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; CLOSURES; CREEP; LITHOLOGY; SHEAR; SHEAR PROPERTIES; SIMULATION; STRATEGIC PETROLEUM RESERVE; WELL CASINGS

Citation Formats

Ehgartner, Brian L., and Park, Byoung Yoon. Interface modeling to predict well casing damage for big hill strategic petroleum reserve.. United States: N. p., 2012. Web. doi:10.2172/1038187.
Ehgartner, Brian L., & Park, Byoung Yoon. Interface modeling to predict well casing damage for big hill strategic petroleum reserve.. United States. doi:10.2172/1038187.
Ehgartner, Brian L., and Park, Byoung Yoon. Wed . "Interface modeling to predict well casing damage for big hill strategic petroleum reserve.". United States. doi:10.2172/1038187. https://www.osti.gov/servlets/purl/1038187.
@article{osti_1038187,
title = {Interface modeling to predict well casing damage for big hill strategic petroleum reserve.},
author = {Ehgartner, Brian L. and Park, Byoung Yoon},
abstractNote = {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.},
doi = {10.2172/1038187},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2012},
month = {Wed Feb 01 00:00:00 EST 2012}
}

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