Introduction :

The purpose of this work is to compare, on a simple case, Eclipse and Athos in order to put into relieves their respective avantages.

ATHOS and Eclipse are   reservoir simulators able to satisfy all the basic reservoir engineering needs. It could be used to forecast a reservoir production as it will be in the example. Very powerfull, these two codes are very complex and allows to make very complete simulation .

Because it is impossible to compare the two codes in all theirs particularities, the objective is to test the codes on a very simple case and to help to choose the best code for the future generation of MFN .


What will be compared ?

In order to be the most objective, we will use only the pre and post processing devoted to the code .


For Athos , a program which name is SIMView helps the code to define the grid , initial cells and parameters of the simulation . Because,  Eclipse doesn't have an equivalent, the comparison will be make without SIMView ( for the preprocessing ! ) .
The preprocessing is made by command lines for the two codes . Thus, that will be these command lines which will be compared.

The code itself :
The facility to run the code and options they allow will determine the conclusion.

Postprocessing :

Here, the aim is to compare datas given by the codes and  the software of visualisation of the parameters  :


Presentation of the case :

We want to simulate a reservoir in a porous field. At the beginning, the field is full of oil. We inject water in a cell and we recover the production of oil in another cell.
It can be interesting to display :

Field's description :


Parameters :
About water : About oil : About the field :
5 cells
5 cells
5 cells
5 cells
5 cells



Case with Eclipse :

Preprocessing :
The command lines are written in one file.
  • We can divide the data in different steps :
    specification of datas  which will be written in files for the Eclipse Graphics Package

    Complete File .
    Run with Eclipse :
    For the installation , it is only necessary to print in the .cshrc file :
    setenv LM_LICENSE_FILE=/logiciels-mfn/Eclipse/macros/license.dat

    To run : @eclipse file.DATA  ( this file has been created by the preprocessing ).

    The code creates different files :

    Post processing :
    The Eclipse graphics package is GRAF  ; to run : @graf
    Like Eclipse, there is a  complex and  complete  written manual which will help surely  readers.

    First of all, you have to choice a version of graf ( interactive with graphics one ) and to specify your computer ( for Sun (Solaris 2)  : 53 ).


    Different steps with GRAF :




    By this method, you can only plot graphs versus time . If you want to visualize for example, the presence of oil in the grid and to see the evolution versus time  , let's read after .

    GRAF allows user to plot grafs more complex :
    Complete file .grf

    It is easy to understand : the first lines open summary , grid and resultsfile , then you create a new picture ( here pictuce 1 ) , finally  you create different graphs and you specify : grid, file , XY ( or XZ or YZ ), 2D , results ( here soil: saturation of oil ) and finally the step .

    menu 8-2 : execution of the intructions ..... menu 5-1: display of the picture


    Picture obtained :


    Case with Athos :

    Pre Processing :
    Command lines are written in a principal file ( .edo ) ,  other files ( .DAT ) where can be storage for example values of pressure versus depht and finally a file .sdo necessary for running .

    Only the step of calculation may be changed.
    back ....


    Complete file .edo

    These files allow to give physic parameters to the code without writting them in the .edo.


    back ....


    Complete files .data

    file .sdo
    back ....


    Complete file .sdo

    Run with Athos
    No run has been carried out .
    Post Processing
    The post processing is made by SIMView, software that can make Preprocessing.
    Installation of SIMView :
    First, in the .cshrc file :
    set path=( $path /logiciels-mfn/Eclipse/macros/logiciels-mfn/SIMView-ATHOS/ega/bin )

    Then,  if you want to visualize an example of the demo , cope in your directory like this :

    ega -installdb -dir /users/.... /repertoire/base demoDB

    To run :



    How to use SIMView :
    Because I didn't have enough time to install my results in SIMView ( it seems to be quite difficult ), I use the installation of former students ( Talbi Samia and Guenadou David   for production of results and Samia Talbi for intallation in SIMView )

    It become very easy to visualize exactly what you want .... SIMView is well constructed and simple to use .

    Examples of graphs :



    Comparison and conclusion:

    First of all, I would like to insist on the fact that this comparison is basis on a very simple test; it doesn't take into account the powerfull of the codes; the aim is only to compare the facility of codes in a first step.

    Preprocessing written manual : + separated files for initialisation : +
    no written manual : +
    Postprocessing direct integration of GRAF : +
    user-friendly : -
    command line for 2D or 3D graphs : -
    Options for graph's presentation : -
    necessity to organize files for SIMView : -
    user-friendly : +
    Options for graph's presentation : +


    On the one hand, by reading this table, Athos seems better than Eclipse . For the preprocessing, the codes are quite equivalent but, with a written manual, Athos is easier. For the run, I can not conclude . For postprocessing, however SIMView needs a special installation of results, it is more user-friendly, offers a lot of options, allows to plot 2D or 3D graphs without any difficulty ....
    On the other hand, Eclipse is used by Schlumberger, ELF and other big firms ....    So , for a student, it can be more interested to work on Eclipse than on Athos ...
    However, because preprocessings are quite equivalent and all results given by Eclipse are produced too by Athos, Athos is the best choice .

    back to the beginning .....