Elastoplastic finite element analysis of inclined wellbores
Elastoplastic finite element analysis of inclined wellbores
An effective finite element model which can be used for elastoplastic analysis of inclined wellbores is presented. The same discretised model can be used for any wellbore inclination and azimuth by varying only the applied initial stress field or boundary conditions. The model is applied for calculating the optimum drilling mud-pressure assuming an elastoplastic rock behaviour and different failure criteria. The rock material parameters were derived from triaxial compression tests. The results show that the difference in mud- pressure predictions between elasticity and plasticity depends strongly on the employed failure criteria. The difference between elasticity and plasticity becomes more pronounced with a criterion which allows the material near the borehole wall to reach a critical plastic strain determined from the calibration tests. In such a case differences from 45% to 80% were encountered. Calibration factors given by the ratio of plasticity predictions over the elasticity predictions have been derived and can be used with analytical models for quick field wellbore stability computations.
535-544
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Papanastasiou, P.
26755af9-c3b5-4350-b0f0-f83c9fca8e92
Cook, J.M.
92301b0c-5ad4-4b28-9d65-a9eb798b5671
July 1998
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Papanastasiou, P.
26755af9-c3b5-4350-b0f0-f83c9fca8e92
Cook, J.M.
92301b0c-5ad4-4b28-9d65-a9eb798b5671
Zervos, A., Papanastasiou, P. and Cook, J.M.
(1998)
Elastoplastic finite element analysis of inclined wellbores.
SPE/ISRM 47322, Rock mechanics in petroleum engineering (EUROCK’98), Trondheim, Norway.
08 - 10 Jul 1998.
.
(doi:10.2118/47322-MS).
Record type:
Conference or Workshop Item
(Paper)
Abstract
An effective finite element model which can be used for elastoplastic analysis of inclined wellbores is presented. The same discretised model can be used for any wellbore inclination and azimuth by varying only the applied initial stress field or boundary conditions. The model is applied for calculating the optimum drilling mud-pressure assuming an elastoplastic rock behaviour and different failure criteria. The rock material parameters were derived from triaxial compression tests. The results show that the difference in mud- pressure predictions between elasticity and plasticity depends strongly on the employed failure criteria. The difference between elasticity and plasticity becomes more pronounced with a criterion which allows the material near the borehole wall to reach a critical plastic strain determined from the calibration tests. In such a case differences from 45% to 80% were encountered. Calibration factors given by the ratio of plasticity predictions over the elasticity predictions have been derived and can be used with analytical models for quick field wellbore stability computations.
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Published date: July 1998
Venue - Dates:
SPE/ISRM 47322, Rock mechanics in petroleum engineering (EUROCK’98), Trondheim, Norway, 1998-07-08 - 1998-07-10
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Local EPrints ID: 75090
URI: http://eprints.soton.ac.uk/id/eprint/75090
PURE UUID: 02edc95a-6d0c-45da-a04b-9ff383e57cd7
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:48
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Author:
P. Papanastasiou
Author:
J.M. Cook
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