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GRAVITY DRAINAGE MECHANISM AND ESTIMATION OF OIL RECOVERY IN IRANIAN CARBONATE CORES

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Author(s): Mehdi Jafari | Amir Badakhshan | Vahid Taghikhani | Davood Rashtchian | Cyrus Ghotbi | V.A. Sajadian

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 50;
Issue: 2;
Start page: 37;
Date: 2008;
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Keywords: Gravity Drainage | Simulation | Modelling | Carbonate cores | Fractured Reservoir | Gas Injection | WAG | Oil Recovery

ABSTRACT
This paper introduces modeling of gravity drainage mechanism, (GD) in Iranian carbonate oil reservoirs. The GDmechanism is an important and active mechanism in fractured carbonate reservoirs through Gas Injection (GI),Water Alternative Gas Injection (WAG) processes and the Gas Invaded Zones (GIZ). It participates in the in oilproduction and oil recovery and takes place for a long time in such reservoirs. A laboratory set up wasconstructed for experimental work. Gas at low pressure and low rates was injected in to the top of a verticalholder containing a carbonate single block core at atmospheric conditions. Simulation studies were conducted byEclipse, a commercial simulator, at lab scale. A proposed simulator model was also proposed in accordance withthe properties of Iranian reservoirs carbonate rocks, which is a approach for investigation of GD mechanism. Themodel was constructed on the basis of laboratory data obtained in the study, implementation of fundamentalequations and the correlation which are available for carbonate reservoirs. The proposed simulation model oncecorrelated with experimental data indicates good results in estimation of the ultimate oil recovery at bothatmospheric and reservoir conditions. Our model matches the data close than Eclipse. The results of the studyshow that the maximum oil recoveries in relations to gas gravity drainage in Iranian oil reservoirs cores are about5 and 4 percent at reservoir and atmospheric conditions, respectively.
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