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| Titel |
Integration of complex reservoir grids for hydromechanical coupling |
| VerfasserIn |
Benjamin Nakaten, Maik Pohl, Thomas Kempka |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149559
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| Publikation (Nr.) |
 EGU/EGU2017-13919.pdf |
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| Zusammenfassung |
| Geomechanics became an integral part in the assessment of geological subsurface utilization
during the last decade. However, complex grids as applied in state-of-the-art reservoir
simulation, including local grid refinements, pinch-out elements resulting from geological
discontinuities and reservoirs of low thickness, hinder a straight-forward integration of these
grids into geomechanical simulations. Hence, the geomechanical modelling community tends
to simplify their grid discretization schemes to meet the grid geometry criteria required
by geomechanical simulators or to apply complex interpolation methods between
reservoir simulation and geomechanical grids. Both approaches are known to result in
significant deviations compared to coupled simulations conducted on the very same
grid. Hereby, the application of specific interpolation methods further demands for
careful result verification between single parameter transfers between both simulation
grids, e.g., including the development of model-specific verification procedures.
Consequently, utilization of identical grids in both simulators should be preferred over both
workarounds.
Resolving this pressing issue, we implemented a fast algorithm using FLAC3D [1]
intrinsics (C++), allowing for an efficient and seamless integration of Schlumberger
ECLIPSE grids [2], generated using, e.g., the Petrel software package [3], including
pinch-out elements and local grid refinements (LGRs). This algorithm comprises
four major steps: (1) read the ECLIPSE global grid (hexahedron and pinch-out
elements) and generate a compressed corner point grid with unique element nodes; (2)
read any LGRs present in the model and transfer these to the geomechanical grid
using the previously retrieved global grid information; (3) verify if all (including
pinch-outs) element geometries meet the geomechanical grid geometry criteria and revise
these elements as required; (4) parametrize the global grid and LGR elements and
maintain a data structure for parameter exchange between reservoir and geomechanical
simulators.
Using the algorithm enables modellers to transfer multi-million element ECLIPSE grids
to, e.g., FLAC3D for coupled hydromechanical simulations within a few minutes instead of
employing time-consuming grid simplification or parameter interpolation, while
maintaining an efficient data structure for parameter exchange during the specific coupling
steps.
[1] Itasca. FLAC3D Software Version 5.01, Advanced Three Dimensional Continuum
Modelling
for Geotechnical Analysis of Rock, Soil and Structural Support. User’s Manual.
2015.
[2] Schlumberger. ECLIPSE Reservoir Engineering Software, Version 2015.1;
2015.
[3] Schlumberger. Petrel Seismic-to-Evaluation Software, Version 2015; 2015. |
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