Geodesic
Parallel Geothermal Numerical Model with Fractures and Multi-Branch Wells
Laurence Beaude1 ; Thibaud Beltzung2 ; Konstantin Brenner3 ; Simon Lopez4 ; Roland Masson3 ; Farid Smai4 ; Jean-frédéric Thebault5 ; Feng Xing6
1 Université Côte d’Azur, Inria, CNRS, LJAD, UMR 7351 CNRS, team Coffee, Parc Valrose 06108 Nice Cedex 02, France,
2 CEA Saclay, DEN/DANS/DM2S/STMF/LMEC
3 Université Côte d’Azur, Inria, CNRS, LJAD, UMR 7351 CNRS, team Coffee, Parc Valrose 06108 Nice Cedex 02, Romania
4 BRGM, 3 avenue Claude-Guillemin, BP 36009, 45060 Orléans Cedex 2, France,
5 Storengy
6 Université Côte d’Azur, Inria, CNRS, LJAD, UMR 7351 CNRS, team Coffee, Parc Valrose 06108 Nice Cedex 02, BRGM,
ESAIM. Proceedings, Tome 63 (2018), pp. 109-134.

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To answer the need for an efficient and robust geothermal simulation tool going beyond existing code capabilities in terms of geological and physical complexity, we have started to develop a parallel geothermal simulator based on unstructured meshes. The model takes into account complex geology including fault and fracture networks acting as major heat and mass transfer corridors and complex physics coupling the mass and energy conservations to the thermodynamic equilibrium between the gas and liquid phases. The objective of this Cemracs project was to focus on well modeling which is a key missing ingredient in our current simulator in order to perform realistic geothermal studies both in terms of monitoring and in terms of history matching. The well is discretized by a set of edges of the mesh in order to represent efficiently slanted or multi-branch wells on unstructured meshes. The connection with the 3D matrix and the 2D fracture network at each node of the well is accounted for using Peaceman’s approach. The non-isothermal flow model inside the well is based on the usual single unknown approach assuming the hydrostatic and thermodynamical equilibrium inside the well. The parallelization of the well model is implemented in such a way that the assembly of the Jacobian at each Newton step and the computation of the pressure drops inside the well can be done locally on each process without MPI communications.
DOI : 10.1051/proc/201863109

Laurence Beaude 1 ; Thibaud Beltzung 2 ; Konstantin Brenner 3 ; Simon Lopez 4 ; Roland Masson 3 ; Farid Smai 4 ; Jean-frédéric Thebault 5 ; Feng Xing 6

1 Université Côte d’Azur, Inria, CNRS, LJAD, UMR 7351 CNRS, team Coffee, Parc Valrose 06108 Nice Cedex 02, France,
2 CEA Saclay, DEN/DANS/DM2S/STMF/LMEC
3 Université Côte d’Azur, Inria, CNRS, LJAD, UMR 7351 CNRS, team Coffee, Parc Valrose 06108 Nice Cedex 02, Romania
4 BRGM, 3 avenue Claude-Guillemin, BP 36009, 45060 Orléans Cedex 2, France,
5 Storengy
6 Université Côte d’Azur, Inria, CNRS, LJAD, UMR 7351 CNRS, team Coffee, Parc Valrose 06108 Nice Cedex 02, BRGM, 
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     author = {Laurence Beaude and Thibaud Beltzung and Konstantin Brenner and Simon Lopez and Roland Masson and Farid Smai and Jean-fr\'ed\'eric Thebault and Feng Xing},
     title = {Parallel {Geothermal} {Numerical} {Model} with {Fractures} and {Multi-Branch} {Wells}},
     journal = {ESAIM. Proceedings},
     pages = {109--134},
     publisher = {mathdoc},
     volume = {63},
     year = {2018},
     doi = {10.1051/proc/201863109},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/201863109/}
}
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Laurence Beaude; Thibaud Beltzung; Konstantin Brenner; Simon Lopez; Roland Masson; Farid Smai; Jean-frédéric Thebault; Feng Xing. Parallel Geothermal Numerical Model with Fractures and Multi-Branch Wells. ESAIM. Proceedings, Tome 63 (2018), pp. 109-134. doi : 10.1051/proc/201863109. http://geodesic.mathdoc.fr/articles/10.1051/proc/201863109/

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