A locally conservative finite element framework for the simulation of coupled flow and reservoir geomechanics |
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Authors: | Birendra Jha Ruben Juanes |
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Institution: | (1) Occidental Oil and Gas Corporation, 111 W Ocean Blvd., 7th Floor, Long Beach, CA 90802, USA;(2) Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Room 48-319, Cambridge, MA 02139, USA |
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Abstract: | In this paper, we present a computational framework for the simulation of coupled flow and reservoir geomechanics. The physical
model is restricted to Biot’s theory of single-phase flow and linear poroelasticity, but is sufficiently general to be extended
to multiphase flow problems and inelastic behavior. The distinctive technical aspects of our approach are: (1) the space discretization
of the equations. The unknown variables are the pressure, the fluid velocity, and the rock displacements. We recognize that
these variables are of very different nature, and need to be discretized differently. We propose a mixed finite element space
discretization, which is stable, convergent, locally mass conservative, and employs a single computational grid. To ensure
stability and robustness, we perform an implicit time integration of the fluid flow equations. (2) The strategies for the
solution of the coupled system. We compare different solution strategies, including the fully coupled approach, the usual
(conditionally stable) iteratively coupled approach, and a less common unconditionally stable sequential scheme. We show that
the latter scheme corresponds to a modified block Jacobi method, which also enjoys improved convergence properties. This computational
model has been implemented in an object-oriented reservoir simulator, whose modular design allows for further extensions and
enhancements. We show several representative numerical simulations that illustrate the effectiveness of the approach. |
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Keywords: | Geomechanics Iteratively coupled Local mass conservation Mixed finite elements Oil and gas Poroelasticity Reservoir Unconditionally stable Undrained split |
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