ATHOS

This project (FSWA) aims at make a Fist Step Whith Athos. The ATHOS model is a reservoir simulator able to satisfy all the basic reservoir engineering needs. It could be used to forecast a reservoir production.

During this project, we have to:





1. Installation of ATHOS:

The installation of the software can be done only under certain conditions:

When all the conditions are realized, the implementation can take effect.

During the instalation, we have copied many files from a DAT cassette (about 200 Mo) to the server. We have modified the access of some files, and created some alias in the .chrc of our directory.

Go to the contents

2. Test of working of ATHOS:

To check the installation of the code, we chose two ways:

When launching the software,  SIMView data browser window appears on the screen.  The possibility of openning a project is offered by clicking on the project button situated on the top left of the window. This makes a connection with a list that provides all available databases. The one that contains demonsration cases is demoDB. No problems apears in this databases.

This will represent the main part of the validation. It anbles us to understand well SIMView's working and to simulate the cases we choose.

The useful part of the user guide will be here: SIMView Tutorial : it gives step by step the instructions to follow in order to create a situation.

Go to the contents
3. Understanding the main concepts of ATHOS:

What you can do:

Athos is able to intgrate a full complete list of reservoir characteristics, and thus, provides a reliable simulation of oil fields. Inputs are the domain geology, which includes characteristics such as porosity and permeability.

Different grids can be set up: the external grid is called basic. Several others are also put in the domain. Every one of those can be refined as many times as needed.

What you can not do:

Only rectangular regular grids can be used.

Practically, you should not refine a grid more than 10 times.

The equations solved by ATHOS are:

(Look at the nomenclature for more details about the equations symbols)

These equations state that the hydrocarbon components are constantly in equilibrium between liquid and vapor phases. Contrary to flow equations, they are local at each cell.

F being a function dependent of the chosen thermodynamic model, which characterizes the equilibrium.

With those equations, we calculate, by using finite differences discetization:

Go to the contents

4. Simulation of simple examples provided with ATHOS:

Actually, buliding your own case is a good idea to understand how ATHOS works. The help file of simview contains a tutorial that allows you to build a case. The visualization of this case is provided page 166 of the help file SIMView.pdf. So, we have follow this tutorial and made our own case. Just the pre-processing part have been done, because of a lack of time. But, running our case with ATHOS is very simple: in a menu we just have to select "Run Athos". So we hope that the futur groups who will work with ATHOS, will run ATHOS and study its results.

Go to the contents


Conclusion

The pre-processing part of ATHOS is very powerful and easy to use. With the data-browser, you can navigate through a case and discover what kind of reservoir it is. In one word, the interface is quite good.

For future new code workshop, we suggest a reservoir study (production, flow of oil...) with ATHOS. We could also suggest to use ATHOS in a 'BEI'.