Adaptive anisotropic meshing and remeshing technique for the numerical modelling of SAGD process
Y. Mesri, W. Zerguine, and T. Coupez
Research Notes, 19th International Meshing Roundtable, Springer-Verlag, pp.Research Note, October 3-6 2010
19th International Meshing Roundtable
Chattanooga, Tennessee, USA.
October 3-6, 2010
IFP, 1 et 4 av. de Bois-Preau, BP 311, 92852 Rueil-Malmaison Cedex, France.
ARKEMA - CERDATO, F-27470 Serquigny, France.
MINES ParisTech, CEMEF, CNRS UMR 7635, BP 207 1 rue Claude Daunesse 06904 Sophia Antipolis Cedex , France.
This note describes an adaptive meshing and automatic remeshing technique
for the numerical modelling of the Steam Assisted Gravity Drainage process
and called SAGD. The topics will be illustrated here is the numerical
modelling of the development of steam chamber in the reservoir field. Steam
chamber inevitably occurs during thermal and geomechanical processes and
have a major impact on the final oil recovery. This phenomena seems to be
simple but their mechanisms are not very well understood. Different methods
allow to model SAGD process and a central idea realized through several
studies is that the near-well region must be heated rapidly and efficiently for
significant early-time response. To improve early-time response of SAGD, it
is necessary to heat the near-wellbore area to reduce oil viscosity and allow
gravity drainage to take place. Ideally heating should occur with minimal
circulation or bypassing of steam. Since project economics are sensitive to
early production response, we are interested in optimizing the start-up procedure.
An investigation of early-time processes to improve reservoir heating
will be discussed. We perform a numerical simulation study of combinations
of steam injection and steam circulation prior to SAGD in an effort to better
understand and improve early-time response. In these case, the quality of the
numerical solutions are strongly related to the accuracy of calculations around
the considered temperature front, and so for a given computational cost, optimal
accuracy is obtained by using anisotropic meshes, with refinement close
to the high error of temperature field. Periodic remeshing is performed such
as the refinement zone describe accurately the temperature front displacement.
Results from this study, including temperature distributions, display the behaviour of steam diffusion and conduction prior to SAGD. The mesh
adaptation improve dramatically the description of the temperature distributions.
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