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SUMMARY:A Numerical Method of Coupled Reservoir-Geomechanical Problem Usin
g High Resolution for Fluid Flow Domain
DTSTART;VALUE=DATE-TIME:20180517T184300Z
DTEND;VALUE=DATE-TIME:20180517T184500Z
DTSTAMP;VALUE=DATE-TIME:20210928T191856Z
UID:indico-contribution-311@events.interpore.org
DESCRIPTION:Speakers: Dawei WU (Peking University)\nAccurate prediction of
petroleum reservoir production in structurally weak geologic areas such a
s fractured reservoirs or low-permeability reservoirs requires both mechan
ical deformation and fluid flow modeling. Even production of reservoirs lo
cated in stable environments may also need to be predicted by fluid-solid
coupled models in case of injection of water or carbon dioxide. The equati
ons governing the interaction of solid and fluid in rocks are equilibrium
equation and continuity equation. Generalized finite element method is usu
ally adopted for the fluid-solid coupled models\, however it needs rather
much effort in programming and is not satisfactory in computational effici
ency. The mixed finite element and finite volume scheme is proposed as an
alternative method since it involves less computational effort and improve
s the simulation efficiency. In the mixed FEM-FVM method\, the equilibrium
equation is discretized in the spatial domain for geomechanics by finite
element method\, and the continuity equation is discretized in the fluid f
low domain by finite volume method. Solving this coupled set of equations\
, the displacement of solid and pore pressure can be obtained.\nIn the act
ual simulation of reservoir exploition\, the fluid flow should only be sim
ulated in the reservoir area\, while the geomechanics need to be investiga
ted in the whole computational domain up to the ground in order to fully c
apture the effect of stress and strain change on fluid flow. Thus the flow
domain is typically a subset of the geomechanics domain. In some coupled
analysis\, additional computational domains are added above and below the
reservoir area known as overburden and underburden in order to better capt
ure the stress field. However\, these extra domains significantly increase
the computational cost of simulation. Moreover\, how large area of overbu
rden and underburden is needed to fully capture the stress change still ne
eds further investigation.\nIn order to improve the computational efficien
cy of coupled analysis when overburden and underburden computational domai
ns are included\, a FEM-FVM method using high resolution for fluid flow do
main is proposed in this paper. The advantage of the presented method is t
hat different computational grids could be used for finite element method
and finite volume method. The grids used in finite volume method are set u
p by meshing inside the finite element grids for fluid flow domain. Theref
or numerical simulation of fluid flow can be carried out in finer resoluti
on for reservoir domain when geomechanics simulation will be carried out i
n coarser grids. Since the geomechanics component causes most of the calcu
lation burden\, this method can significantly improve the efficiency of th
e whole simulation. Several numerical examples are presented to show accur
acy and efficiency of the proposed method.\n\nhttps://events.interpore.org
/event/2/contributions/311/
LOCATION:New Orleans
URL:https://events.interpore.org/event/2/contributions/311/
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