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Two-phase flow thermo-hydro-mechanical modeling for a water flooding field case

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摘要: Simulation of subsurface energy system involves multi-physical processes such as thermal, hydraulical, and
mechanical (THM) processes, and requires a so-called THM coupled modeling approach. THM coupled modeling
is commonly performed in geothermal energy production. However, for hydrocarbon extraction, we need to
consider multiphase flow additionally. In this paper, we describe a three-dimensional numerical model of non-
isothermal two-phase flow in the deformable porous medium by integrating governing equations of two-phase
mixture in the porous media flow in the reservoir. To account for inter-woven impacts in subsurface condi-
tions, we introduced a temperature-dependent fluid viscosity and a fluid density along with a strain-dependent
reservoir permeability. Subsequently, we performed numerical experiments of a ten-year water flooding pro-
cess employing the open-source parallelized code, OpenGeoSys. We considered different well patterns with colder
water injection in realistic scenarios. Our results demonstrate that our model can simulate complex interactions of
temperature, pore pressure, subsurface stress and water saturation simultaneously to evaluate the recovery per-
formance. High temperature can promote fluid flow while cold water injection under non-isothermal conditions
causes the normal stress reduction by significant thermal stress. Under different well patterns the displacement
efficiency will be changed by the relative location between injection and production wells. This finding has
provided the important reference for fluid flow and induced stress evolution during hydrocarbon exploitation
under the environment of large reservoir depth and high temperature.

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[V1] 2024-07-08 09:58:08 ChinaXiv:202407.00099V1 下载全文
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