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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.259 SNIP: 0.466 CiteScore™: 0.83

ISSN Imprimir: 2151-4798
ISSN On-line: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.v1.i1.40
pages 39-47


Behzad Rostami
Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Riyaz Kharrat
Petroleum University of Technology, Petroleum Research Center, Tehran, Iran
V. Alipour Tabrizy
Petroleum University of Technology, Tehran Research Center, Ghasemi Zadian St.-Satarkhan St., Tehran 1453953111, Iran
M. Khosravi
EOR Research Institute ofNIOC, No. 22, Negar Valley, Valiasr St.- Tehran 19698113771, Iran
C. Ghotbi
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran


The drainage of oil under gravity forces is an efficient method because it can farther reduce the remaining oil saturation to below that obtained after water flooding. This paper describes a series of visual experiments under forced gas invasion with special attention to the effects of wettability. From oil production history and image analysis, we examine a threshold criterion for displacement stability that is consistent with the results of gradient percolation theory. The effect of the destabilized front velocity on oil recovery and residual saturation is investigated for both wettability conditions. Different recovery rates occur with different fluid morphologies, which depend on the matrix wettability and the balance between gravity and viscous and capillary forces. The dimensionless capillary and gravity numbers are used in analyzing the results. It has been shown that oil production decreases with displacement instability; however, this behavior would extremely depend on the wetting state. In addition, results indicated that the oil recovery depends linearly on the ratio of the gravity to viscous forces; however, the slope of this relationship in oil-wet porous media is more than twice of the water-wet system.