GOCAD StreamLab Revisited for Hydrogeology Applications

Jean-Baptiste Mathieu and Pauline Collon and Guillaume Caumon and Jean-Jacques Royer. ( 2008 )
in: Proc. 28th Gocad Meeting, Nancy, France

Abstract

Last year, a streamline simulator, referred as to StreamLab, was developed to solve large multicompositional fluid flow models involved in gas & oil 3D reservoirs (Oladyshkin et al., 2007, 2008). This gOcad plugin solves the pressure and velocity mass balance equations using a finite volume flow numerical approach on each control cell volume of the studied domain given some oil reservoir boundary conditions. The hydrodynamic and thermodynamic parts are solved by a multi-component 1D solver along each streamline which are derived from the velocity field. This petroleum oriented flow simulator takes into account only two types of boundary conditions, namely the impermeable ones (no-flux condition) and the infinite analytical aquifer one. It is of limited use in classical hydrological problems. This work aims at adapting the gOcad StreamLab plugin to hydrogeology issues. In a first step, the multicompositional part is simplified to introduce new boundary conditions such as imposed pressures, or/and imposed flow rates (Neuman and Dirichlet), and free unsaturated boundary layer, frequently encountered in hydrogeological studies. These conditions have been tested for well rate or pressure conditions, but the algorithm can not be extended directly at the domain limits. In order to be as flexible, easy to use and model independent as possible, boundary conditions are attached to Surfaces instead of Grid objects. The field pressure is computed by solving the mass balance equations. It is updated at every time step when it is necessary to account for time dependent boundary conditions. In a second part, the mass balance equations and the boundary conditions are modified to compute the pressure field for a non-captive aquifer accounting for recharge flows and faults influence. This part is still in progress. These StreamLab plugin extensions extend gOcad capabilities to several applications encountered in hydrogeological and environmental issues.

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    BibTeX Reference

    @inproceedings{Mathieu2008,
     abstract = { Last year, a streamline simulator, referred as to StreamLab, was developed to solve large
    multicompositional fluid flow models involved in gas & oil 3D reservoirs (Oladyshkin et al., 2007, 2008).
    This gOcad plugin solves the pressure and velocity mass balance equations using a finite volume flow
    numerical approach on each control cell volume of the studied domain given some oil reservoir boundary
    conditions. The hydrodynamic and thermodynamic parts are solved by a multi-component 1D solver
    along each streamline which are derived from the velocity field. This petroleum oriented flow simulator
    takes into account only two types of boundary conditions, namely the impermeable ones (no-flux
    condition) and the infinite analytical aquifer one. It is of limited use in classical hydrological problems.
    This work aims at adapting the gOcad StreamLab plugin to hydrogeology issues. In a first step, the
    multicompositional part is simplified to introduce new boundary conditions such as imposed pressures,
    or/and imposed flow rates (Neuman and Dirichlet), and free unsaturated boundary layer, frequently
    encountered in hydrogeological studies. These conditions have been tested for well rate or pressure
    conditions, but the algorithm can not be extended directly at the domain limits. In order to be as flexible,
    easy to use and model independent as possible, boundary conditions are attached to Surfaces instead of
    Grid objects. The field pressure is computed by solving the mass balance equations. It is updated at every
    time step when it is necessary to account for time dependent boundary conditions.
    In a second part, the mass balance equations and the boundary conditions are modified to compute
    the pressure field for a non-captive aquifer accounting for recharge flows and faults influence. This part is
    still in progress.
    These StreamLab plugin extensions extend gOcad capabilities to several applications encountered in
    hydrogeological and environmental issues. },
     author = { Mathieu, Jean-Baptiste AND Collon, Pauline AND Caumon, Guillaume AND Royer, Jean-Jacques },
     booktitle = { Proc. 28th Gocad Meeting, Nancy, France },
     title = { GOCAD StreamLab Revisited for Hydrogeology Applications },
     year = { 2008 }
    }