Ethyl acetate as a bio-based solvent to reduce energy intensity and CO2 emissions of in situ bitumen recovery |
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Authors: | Ali Zirahi Hassan Sadeghi Yamchi Ali Haddadnia Mohsen Zirrahi Hassan Hassanzadeh Jalal Abedi |
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Affiliation: | Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada |
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Abstract: | We introduce ethyl acetate (EA), a bio-based chemical, as a potential solvent for bitumen recovery through comprehensive phase behavior and numerical simulation studies. Phase behavior and thermophysical properties of EA/live bitumen are measured at temperatures and pressures up to 190°C and 4 MPa, respectively. Experimental studies suggested that coinjection of EA with steam can reduce the bitumen viscosity by several orders of magnitude. Our numerical simulations show that coinjection of 2–8 mol% EA with steam can significantly reduce the steam-oil-ratio (SOR) by almost 0.9 units while increasing the bitumen production rate. This reduction in SOR can be translated to significant energy saving of ~2.2 GJ, emission reduction of ~120 kg of CO2, and wastewater reduction of ~120 m3 per ton of the produced bitumen, which are almost 20–25% lower than the steam-assisted gravity drainage (SAGD) process. |
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Keywords: | bitumen energy intensity greenhouse gas emission oil sands solvent-aided recovery thermal recovery |
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