Modeling Fully Coupled Oil–Gas Flow in a Dual-Porosity Medium
Publication: International Journal of Geomechanics
Volume 5, Issue 4
Abstract
A finite element model has been developed to simulate two-phase, (i.e., oil and gas) flow and solid deformation in a dual-porosity medium. The model accounts for coupling between solid deformations and fluid flow in both the primary medium (representing the matrix pores and solid) and the secondary medium (used to represent fractures in the present study). The model is verified against relevant analytical solutions and then applied to the problem of an inclined wellbore under generalized plane strain conditions, subjected to a three-dimensional in situ state of stress in a fractured formation saturated with oil and gas. A parametric study has been carried out to demonstrate the effect of dual-porosity parameters, phase saturations, and interaction between the two media. The implementation of double effective stress laws in the present study is a significant deviation from some classical dual-porosity models and helps to incorporate the effect of deformation of the secondary medium (representing the fractures).
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Acknowledgments
This work is supported by a NSF grant to the Rock Mechanics Research Center,NSF the Oklahoma Center for Advancement of Science and Technology, and the O.U. Rock Mechanics Consortium.
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© 2005 ASCE.
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Received: Mar 9, 2004
Accepted: Jul 19, 2004
Published online: Dec 1, 2005
Published in print: Dec 2005
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