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SUMMARY:A New Multi-scale Computational Model for Flow and Transport in Sh
 ale Gas Reservoirs
DTSTART:20140917T093000
DTEND:20140917T103000
DTSTAMP:20260407T003011Z
UID:0de034a43436634d415f8e421adef112d42a0dafb46454c71c5453e1
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Marcio A. Murad\, National Laboratory for Scientific Co
 mputing LNCC/MCTI\, Brazil\nThe macroscopic behavior of gas flow and trans
 port in multi-porosity shale gas reservoirs is rigorously derived within t
 he framework of the reiterated homogenization procedure applied to the The
 rmodynamics of inhomogeneous gases in nanopores. At the finest nanoscale t
 he Density Functional Theory is applied to construct general adsorption is
 otherms and local density profiles of pure methane which reflect both repu
 lsive hard sphere effects and Lennard-Jones attractive intermolecular inte
 ractions between fluid-fluid supplemented by a fluid-solid exterior potent
 ial. Such local description reproduces the monolayer surface adsorption ru
 led by the Langmuir isotherm in the asymptotic regime of large pore size d
 istributions. The nanoscopic model is upscaled to the microscale where ker
 ogen particles and nanopores are viewed as overlaying continua forming the
  organic aggregates at thermodynamic equilibrium with the free gas in the 
 micropores. The resultant reaction/diffusion equation for pure gas movemen
 t in the aggregates is coupled with both Fickian diffusion of dissolved ga
 s in water and free gas flow in the micropores along with the inorganic so
 lid phase (clay\, quartz\, calcite) assumed impermeable. By postulating co
 ntinuity of fugacity at the interface between free and dissolved gas in mi
 cropores and neglecting the water movement\, we upscale the microscopic pr
 oblem to the mesoscale\, where both organic\, inorganic solids and micropo
 res are homogenized. The upscaling entails a new characteristic function w
 hich arises from the jumps in concentrations across the kerogen/micropore 
 interface and leads to a new nonlinear pressure equation for gas hydrodyna
 mics in the micropores including a new storage parameter strongly dependen
 t on the total carbon content (TOC). When coupled with the nonlinear singl
 e phase gas flow in the hydraulic fractures the mesoscopic model leads to 
 a new macroscopic triple porosity model with mass transfer functions betwe
 en the different levels of porosity. Computational simulations illustrate 
 the potential of the multiscale approach in numerically constructing accur
 ate gas production curves in different regimes of gas flow.
LOCATION:GC D0 386
STATUS:CONFIRMED
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