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Low-Temperature Air/Solvent Injection for Heavy-Oil Recovery in Naturally Fractured Reservoirs

Authors
Jose Mayorquin (University of Alberta) | Tayfun Babadagli (University of Alberta)
DOI
https://doi.org/10.2118/174542-PA
Document ID
SPE-174542-PA
Publisher
Society of Petroleum Engineers
Source
Journal of Canadian Petroleum Technology
Volume
54
Issue
03
Publication Date
May 2015
Document Type
Journal Paper
Pages
148 - 163
Language
English
ISSN
0021-9487
Copyright
2015.Society of Petroleum Engineers
Disciplines
Keywords
miscible injection, deep reservoirs, low temperature air injection, fractured reservoirs, injection of air with hydrocarbon gases
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387 since 2007
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Summary

Limited studies on oil recovery from naturally fractured reservoirs using low-temperature air injection show that the process is strongly dependent on oxygen (O2)-diffusion coefficient and matrix permeability, both of which are typically low. A new approach (i.e., the addition of hydrocarbon solvent gases into air) is expected to improve the diffusivity of the gas mixture and to accelerate the oxidation. To study this new idea, called low temperature air/solvent injection, laboratory tests were performed by soaking heavy-oil-saturated cores in air/solvent filled reactors to determine the critical parameters on recovery. Laboratory tests were complemented by conducting experiments using air at different O2 concentrations: zero (i.e., nitrogen), 21.0 mol% (air), and 37.3 mol% (O2-enriched air). For safety reasons, it is imperative that enough time be given for air diffusion before the injected air breaks through a highly permeable fracture network. This implies that the huff ‘n’ puff type of injection is a plausible option as opposed to the continuous injection of air. A high recovery factor was obtained by soaking a single matrix in an air/solvent chamber at static conditions rather than with air only. The period of pressure stabilization was faster for the air/solvent mixture than in 100% solvent. The asphaltene content was lower in the air/solvent case than in the 100%-air injection case. Instead of pure-hydrocarbon solvent, injection of an air/solvent mixture yields a better recovery with less asphaltene. This is expected to reduce the cost of the process compared with pure-solvent injection. At low temperatures (75C), O2 consumption in the matrix oil was low, while at high temperatures, the O2 was partially (150C) or totally (200C in the presence of propane) diffused and consumed in the matrix.

File Size  1 MBNumber of Pages   16
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