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Simulation Study of Conventional Fire Flooding (CFF) in Fractured Combustion Cells: A Promising Tool along Experiment
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Shiraz 2009 - 1st EAGE International Petroleum Conference and Exhibition, May 2009, cp-125-00080
- ISBN: 978-90-73781-65-8
Abstract
The Conventional Fire Flooding (CFF) process application feasibility on fractured carbonated reservoirs remained questionable. In this paper first combustion parameters and reaction kinetics of a naturally fractured low permeability carbonated heavy oil reservoir in Iran called Kuh-E-Mond applied to simulation study. After that, simulator has been validated with Kuh-E-Mond combustion tube experiment. Recovery mechanism in single block matrix is different from one in conventional model since oxygen first flows into the fractures and then diffuses from all sides into the matrix. Combustion of the oil in the fractures produces some water ahead of fracture combustion front which prohibits oxygen from early breakthrough through fractures into production well. Water imbibes to the matrix and causes matrix oil drainage to the producer. This oxygen diffusion/water imbibition based recovery mechanism is slower in production rates compare to conventional model recovery mechanism, and causes lower produced oil quality since less oxygen is available for matrix. Further, sensitivity analysis on air injection rate, formation thickness, injection well depth of perforation, horizontal fractures and also effect of water alternating air process on fracture model results have been studied.