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A locally conservative finite element framework for the simulation of coupled flow and reservoir geomechanics

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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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Acknowledgments

The authors are thankful for financial support from the members of the affiliate program of the Stanford University Petroleum Research Institute for Reservoir Simulation (SUPRI-B). Partial support was also provided by Foundation CMG; this support is gratefully acknowledged.

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Authors and Affiliations

  1. Occidental Oil and Gas Corporation, 111 W Ocean Blvd., 7th Floor, Long Beach, CA, 90802, USA

    Birendra Jha

  2. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Room 48-319, Cambridge, MA, 02139, USA

    Ruben Juanes

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  1. Birendra Jha
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  2. Ruben Juanes
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Correspondence to Ruben Juanes.

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Jha, B., Juanes, R. A locally conservative finite element framework for the simulation of coupled flow and reservoir geomechanics. Acta Geotech. 2, 139–153 (2007). https://doi.org/10.1007/s11440-007-0033-0

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  • DOI: https://doi.org/10.1007/s11440-007-0033-0

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