A summary of the sources of input parameter values for the Waste Isolation Pilot Plant final porosity surface calculations

Butcher, B.M.

doi:10.2172/522732

Cited by 14 publications

(36 citation statements)

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“…The anhydrite in the lower caprock layer is expected to experience inelastic material behavior. The anhydrite layer is considered isotropic and elastic until yield occurs (Butcher 1997). Once the yield stress is reached, plastic strain begins to accumulate.…”

Section: Lithologies Around the Salt Domementioning

confidence: 99%

Interbed Modeling to Predict Wellbore Damage for Big Hill Strategic Petroleum Reserve

Park

2014

Rock Mech Rock Eng

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Oil leaks were found in wellbores 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 interbed between the caprock bottom and salt top. A three-dimensional finite element model, which allows each cavern to be configured individually, was constructed to investigate horizontal and vertical displacements in each well as it crosses the various interbeds. The model contains interfaces between each lithology and a shear zone (fault) to examine the interbed behavior in a realistic manner. This analysis results indicate that the casings of Caverns 105 and 109 failed, respectively, from shear stress that exceeded the casing shear strength due to the horizontal movement of the salt top relative to the caprock and tensile stress due to the downward movement of the salt top from the caprock. The wellbores of Caverns 114 and 104, located at the far end of the field and near the fault, respectively, are predicted to fail by shear stress in the near future. The wellbores of inmost Caverns 107 and 108 are predicted to fail by tensile stress in the near future. The salt top subsides because the volumes of caverns in the salt dome decrease with time due to salt creep closure, while the caprock does not subside at the same rate as the salt top because the caprock is thick and stiff. This discrepancy yields deformation of the well.

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Section: Lithologies Around the Salt Domementioning

confidence: 99%

Interbed Modeling to Predict Wellbore Damage for Big Hill Strategic Petroleum Reserve

Park

2014

Rock Mech Rock Eng

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“…The anhydrite layer is considered isotropic and elastic until yield occurs [Butcher, 1997]. Once the yield stress is reached, plastic strain begins to accumulate.…”

Section: Lithologies Around the Salt Domementioning

confidence: 99%

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

Ehgartner¹,

Park²

2012

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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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“…The anhydrite as simulated in the lower caprock layer is expected to experience inelastic material behavior. The anhydrite layer is considered isotropic and elastic until yield occurs (Butcher, 1997). The behavior of the anhydrite is assumed to be the same as the WIPP anhydrite.…”

Section: Materials Propertiesmentioning

confidence: 99%

Analysis of salt and casing fracture mechanisms during cavern integrity testing for SPR salt caverns.

Ehgartner¹,

Sobolik²

2006

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This report presents computational analyses to evaluate the risk of Cavern Certification Testing on casing damage and salt fracturing. This deliverable is performed in support of the U.S. Strategic Petroleum Reserve.Several models have been built utilizing either a 1-cavern or 19-cavern, 30-degree wedge of symmetry as has been used on previous West Hackberry ( Ehgartner and Sobolik, 2002) and Big Hill (Park et al., 2005) analyses. Various stages of complexity have been added to each model: mesh generation for both 1-cavern and 19-cavern fields; the inclusion of the small-diameter well going from the surface to the top of the caverns; and the addition of steel casing and cement liners to the well surfaces. A stratigraphy based on the Bayou Choctaw site has been chosen for modeling, and the caverns are modeled as equivalent cylinders to simplify the calculations. Salt dilation, as defined by two separate dilation criteria, has been generated during simulated workover routines and cavern integrity tests, but only for the models that include the steel casing and cement liners. The addition of these features generates the tensile and shear stress conditions in the model necessary to cause stress states that exceed dilation criteria. These predictions have been made using the power law creep model. The results show that the salt can be damaged during high pressure change conditions in the wells and caverns. 4 ACKNOWLEDGEMENTSThe authors would like to thank Moo Lee, Allan Sattler, and Tom Pfeifle for their review and support of this work.5

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A summary of the sources of input parameter values for the Waste Isolation Pilot Plant final porosity surface calculations

Cited by 14 publications

References 0 publications

Interbed Modeling to Predict Wellbore Damage for Big Hill Strategic Petroleum Reserve

Interbed Modeling to Predict Wellbore Damage for Big Hill Strategic Petroleum Reserve

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

Analysis of salt and casing fracture mechanisms during cavern integrity testing for SPR salt caverns.

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