RASI Resources & Systems International, Inc.
Watershed Planning • Resources Management • Environmental Solutions • Ecological Risk Assessment

--------------
Home

Capability

Services

Software

Contact Us

    

BIOSLURP
Multiphase Hydrocarbon Vacuum Enhanced Recovery & Transport

BIOSLURP is an areal finite element model to simulate three phase (water, oil, and gas) flow and multicomponent (5 species) transport in groundwater and 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 phase and gas phase transport in unconfined aquifers. BIOSLURP can also be used to simulate coupled flow of water and LNAPL with a static atmospheric gas phase and transport in groundwater. 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.

In a conventional free phase recovery system (with static gas phase), oil is trapped in the unsaturated zone when the air-oil table falls and oil is trapped in the saturated zone if the oil-water table rises. In a poorly planned recovery system 70 percent of the NAPL may be trapped due to fluid tables fluctuations and areal migration of the plume. 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 from Resources & Systems International, Inc.. allows:
*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 distribution are interpolated internally from the monitoring well data.
*Areal distribution of hydrocarbon is continuously updated and used to estimate transient contaminant loading to groundwater 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.
copyright 2000, Resources & Systems International, Inc.