Open AccessResearch program on fractured petroleum reservoirs: Quarterly report, October 1 through December 31, 1994
Author(s) -
Abbas Firoozabadi
Publication year - 1995
Language(s) - English
Resource type - Reports
DOI - 10.2172/61155
Subject(s) - displacement (psychology) , capillary action , porous medium , capillary pressure , geology , petroleum engineering , pressure gradient , grid cell , flow (mathematics) , matrix (chemical analysis) , porosity , grid , mechanics , geotechnical engineering , fracture (geology) , materials science , composite material , physics , psychology , oceanography , geodesy , psychotherapist
This report covers Task 3, Immiscible gas-oil flow in fractured/layered porous media, Part 1, Viscous displacement in fractured porous media: Experiments and Analysis of experiments and Task 5, Simulation of fractured reservoirs, Dual-porosity simulation incorporating reinfiltration and capillary continuity concepts, Part 3, Interaction between grid cells. In some fractured reservoirs, a gas pressure gradient of the order of 0.1 psi/ft may be established in the fractures due to flow. Such a pressure gradient could result in recovery enhancement of the matrix oil. Several tests were conducted to study viscous displacement in fractured porous media. These tests included both gravity drainage with free gas displacement and forced gas displacement. The results show that there is considerable recovery improvement due to viscous displacement. Numerical results are in very good agreement with the experimental data. In Task 5, the authors propose a method which accounts for reinfiltration and capillary continuity not only within a grid cell, but also between various grid cells. A reinfiltration term is added to the dual-porosity model and the exchange term between the matrix and the fracture is calculated in a simple manner. Four example problems demonstrate the usefulness of the proposed method