Abstract: Numerical Well Test Simulations in Heterogeneous Reservoirs

Georges Blanc, Dominique Guerillot, Daniel Rahon

The poster presents a software package which is devoted to the numerical simulation of well tests. The package is made of three main modules:

PRE PROCESSOR - The user friendly front end to be used to input the reservoir model characteristics and the test data. This module is running on PC's under MS-Windows.

SIMULATOR - The numerical simulator which can be run on any kind of computer from PC's to mainframe.

POST PROCESSOR - The graphical post processor which displays the results of the simulation. Either pressure maps and well results are managed. This module is also running on PC's under MS-Windows.

The simulator provides several advanced features to help the user to identify the reservoir model which best fits the well model pressure to the field recorded data.

INVESTIGATION AREA - The location of the investigation area and its apparent permeability can be computed all along the test period thus giving the user a better understanding of the well pressure behavior.

FACIES IDENTIFICATION - Whenever the reservoir description is made of reservoir facies coming from geostatistical simulation, the gradients of the well pressure versus the facies permeabilities can be computed. A non linear constrained optimization process can then be used to compute the facies properties which give the best model restitution of the recorded test pressure.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France