BIOSLURP - multiphase hydrocarbon vacuum enhanced recovery (bioslurping) and transport model

BIOSLURP Categories: bioremediation, fractured systems models, flow models - saturated zone, flow models - unsaturated zone, vapor transport
 

BIOSLURP Description

BIOSLURP - Multiphase Hydrocarbon Vacuum Enhanced Recovery & Transport

BIOSLURP is an areal finite-element model to simulate three-phase (water, oil and gas) flow and multi-component transport in ground water in the unsaturated zone gas phase. Currently the most advanced model of its kind, BIOSLURP can be used to optimize the recovery of LNAPL, water, and gas by minimizing NAPL entrapment in the saturated/unsaturated zones, and simultaneously simulate multispecies aqueous and gas phase transport in unconfined aquifers. BIOSLURP can also simulate coupled flow of water and LNAPL with a static atmospheric gas phase, as well as the transport in ground water.

BIOSLURP simulates heterogeneous, anisotropic porous media or fractured media. It allows use of isoparametric elements to accurately represent material and physical/hydraulic boundaries. BIOSLURP can be used to design NAPL recovery and hydraulic containment systems for the free phase hydrocarbon plume and dissolved phase plume under complex hydrogeological conditions. Bioslurping (vacuum enhanced recovery) increases gradients in water and oil potentials with minimal fluctuations in the fluid tables and thus helps to reduce volume of residual product and enhance free product recovery.

BIOSLURP KEY FEATURES

• Initial conditions and free oil volume are estimated internally from the monitoring well fluid level data.
• Rectangular and/or 2-D isoparametric quadrilateral elements to accurately model irregular domain and material boundaries, hydraulic, and physical boundaries.
• Bioslurping (vacuum enhanced recovery) of NAPL and water phases is simulated.
• Oil, gas, and water recovery rates are computed.
• Initial (nonzero) concentration distributions are interpolated internally from the monitoring well data.
• Interactive graphical mesh design with BIOSLURP's resident pre-processor. DXF site map shown in the background.
• Areal distribution of hydrocarbon is continuously updated and used to estimate transient contaminant loading to ground water and vadose zone and compute the interphase mass transfers between water, oil, and gas phases.
• Convection, dispersion, diffusion, adsorption, microbial processes based on first order, and oxygen-limited biodegradation kinetics, as well as sequential degradation involving multiple daughter products.
• Interactive finite element mesh generator: rectangular/isoparametric quadrilateral mesh.
• Spatially-variable water recharge, injection or LNAPL leakage.
• Model multiple pumping and/or injection wells.
• Model specified head, specified concentration, and flux conditions for flow and transport.
• Computationally-efficient matrix solution by conjugate gradient method with preconditioning.
• Simulate fractured media or granular porous media.

BIOSLURP INPUT

• Mesh discretization data
• Initial conditions: oil-water and air-oil table elevation distribution
• Boundary conditions for flow: specified head boundaries; flux boundaries
• Soil hydraulic properties: van Genuchten parameters; hydraulic conductivity distribution; porosity; maximum residual saturation; anisotropy angle
• Source/sink boundary

The following parameters are needed if transport is simulated:

• Dispersivities
• Bulk density
• Diffusion coefficient for species
• Biodegradation parameters for each species
• Distribution coefficient
• Mass transfer rate coefficients between phases
• Boundary conditions for transport: specified concentration boundaries; flux boundaries

BIOSLURP OUTPUT

• Spatial distribution of fluid pressure with time
• Spatial distribution of fluid saturation with time
• Fluid velocity distribution with time
• Fluid pumping/injection rates and volume vs. time
• Spatial distribution of species concentration in water and gas phases
• Species mass in water, oil, gas, and solid phases versus time

BIOSLURP USER INTERFACE

Graphical user interface in Windows 95/98/2000/NT. Interface includes a mesh generator/graphical editor which allows DXF site map import and highly irregular geometry.

BIOSLURP REQUIREMENTS: (1,500 nodes) Windows 95/98/2000/NT and 16 MB RAM.

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