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Convergence And Error Analysis Of The Undrained-Split Iterative Coupling Scheme In Heterogeneous Poro-Elastic Media
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, ECMOR XVI - 16th European Conference on the Mathematics of Oil Recovery, Sep 2018, Volume 2018, p.1 - 13
Abstract
Recently, the accurate coupling between subsurface flow and reservoir geomechanics received more attention and importance in both academia and industry. This stems from the fact that incorporating a geomechanics model into upstream flow simulation is critical for obtaining accurate pore-predictions, predicting wellbore instabilities, and modeling hydraulic fracturing. One of the recently introduced iterative coupling algorithms to couple flow with geomechanics is the undrained split iterative coupling algorithm [1,2]. The convergence of this scheme is established in [1] for the single rate iterative coupling algorithm, and in [2] for the multirate iterative coupling algorithm, in which the flow takes multiple finer time steps within one coarse mechanics time step. All previously established results study the convergence of the scheme in homogeneous poro-elastic media. In this work, following the approach in [4], we will extend these results to the case of heterogeneous poro-elastic media, in which each grid cell is associated with its own set of flow and mechanics parameters for both the single rate and multirate schemes. Second, following the approach in [3], we will establish a priori error estimates for the single rate case of the scheme in homogeneous poro-elastic media. In subsequent work, we will supplement our mathematical analysis with numerical results, highlighting the efficiency of the multirate undrained split iterative scheme over the single rate scheme in heterogeneous poro-elastic media. To the best of our knowledge, this is the first rigorous and complete mathematical analysis of the undrained split iterative coupling scheme in heterogeneous poro-elastic media.
[1] Mikelic, A. and Wheeler, M. F. “Convergence of iterative coupling for coupled flow and geomechanics.” Computational Geosciences, 17:455–461, 2013.
[2] Kumar, K., Almani, T., Singh, G., and Wheeler, Mary F. “Multirate Undrained Splitting for Coupled Flow and Geomechanics in Porous Media,” Springer International Publishing, 43–440, 2016.
[3] Almani, T., Kumar, K., and Wheeler, M. F., “Convergence and error analysis of fully discrete iterative coupling schemes for coupling flow with geomechanics.” Computational Geosciences, 21: 1157–1172, 2017.
[4] Almani, T., Kumar, K., and Wheeler, M. F., “Convergence Analysis of Single Rate and Multirate Fixed Stress Split Iterative Coupling Schemes in Heterogeneous Poroelastic Media,” ICES REPORT 17–23, The University of Texas at Austin, Sep. 2017.