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INVESTIGATION ON EFFECTS OF ROCK-FLUID PROPERTIES ON THE SAGD PRODUCTION PROFILE IN NATURALLY FRACTURED RESERVOIR (NFR)

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Author(s): Hani Hashemi Kiasari | Mojtaba Mortazavi Kiasari | Behnam Sedaee Sola

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 52;
Issue: 4;
Start page: 243;
Date: 2010;
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Keywords: EOR | SAGD | Naturally fractured reservoir | Wettability | Capillary pressure.

ABSTRACT
A few studies were done on the SAGD process in naturally fractured reservoirs (NFR). In this study, theeffects of rock-fluid properties on the production profile were investigated using commercial software. Theresults showed three different periods of oil production in SAGD process in NFR. First, fractures depletion inNWR (Near Well Region) affects mainly the initial oil production rate. Second, due to rising of steaminto AWR (Above Well Region), oil rate increases and therefore the first flag of the oil rate pulse occurs.Third, another flag with a reduction trend is observed due to start of oil drainage from matrix blocks.In the water-wet condition, capillary pressure leads to better steam penetration from fractures intomatrices, but in oil-wet, capillary pressure acts inversely. Fractures play important role in case of zerocapillary pressure of matrix but with increasing the capillary pressure, pulses of production magnifiedand early production raises. In negative threshold pressures, capillary pressure acts as an obstacleagainst steam diffusion into matrices initially, however in non-negative cases there is no considerabledifference in oil production rate. Steam profile being more distributed with reduction of matrix capillarypressure and also tendency to oil wettability due to less diffusion of steam into matrices and more penetrationinto upper fractures.
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