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Enhanced recovery of oil from subsurface reservoirs with carbon dioxide. Final report

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This report details the studies made of the displacement of crude oil by carbon dioxide (CO/sub 2/) from consolidated sandpacks. The sandpacks were 20, 60, and 240 inches long and the diameter was 5/8 inch. With the sandpack in a vertical position, the CO/sub 2/ was always injected into the top. The objectives of the research were to determine procedures for predicting the pressure at which CO/sub 2/ displaces crude miscibly and the influence of rate on the displacement of crude with CO/sub 2/. The determination of the miscibility pressure appeared to be the same with the 20 inch long sandpack as with the 60 or 240 inch long sandpack. The total recovery at each pressure was higher with the longer sandpacks. The oil recovery was higher at low rates with the sandpack column in a vertical position. The oil recovery at low rates was lower with the sandpack column in a horizontal position. The optimum CO/sub 2/ slug size was found to be 30% of the hydrocarbon pore volume. Water was found to be more efficient than nitrogen at driving the CO/sub 2/ to displace crude oil. Measurements of the crude oil viscosity from the Foster field decreased as CO/sub 2/ miscibility pressure was increased. On the other hand, the viscosity of the SACROC crude oil from West Texas was found to have a minimum value at a CO/sub 2/ miscibility pressure of approximately 1600 psig. As the pressure increased, the viscosity of the oil with CO/sub 2/ increased. Values of the permeability of dolomite cores were found to increase when flooded with CO/sub 2/ at a high pressure. When the effluent from a core with CO/sub 2/ at a high pressure was flowed through a second dolomite core as the pressure was decreased, the permeability of the second core was decreased. Photographs showed that some of the dolomite core was dissolved by the CO/sub 2/ at high pressures, and that crystal precipitates were formed in the second core as the CO/sub 2/ miscibility pressure was reduced.


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Citation Osoba, J.S. (1984). Enhanced recovery of oil from subsurface reservoirs with carbon dioxide. Final report.
Is NETL associated No
Organization Texas A and M Univ.
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