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Effects of Petroleum-Reservoir Conditions on Oil Recovery by Carbon Dioxide Injection

机译：石油储层条件对二氧化碳注入采油的影响

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Several petroleum reservoir conditions were evaluated to determine their effects on oil recovery by CO sub 2 injection. The conditions studied were reservoir temperature, reservoir pressure, and CO sub 2 slug injection size. With constant pressure, the reservoir temperature was varied from 75 exp 0 to 130 exp 0 F, and optimum oil recovery was obtained at a temperature near the critical temperature of CO sub 2 (87.8 exp 0 F). When the temperature was held constant and the reservoir pressure varied from 650 to 1800 psi, it was found that miscibility pressure may be above but close to 1800 psi. The CO sub 2 slug injection size has been varied from 3% to over 40% PV to determine if oil recovery would increase with increase of CO sub 2 slug size. Graphic representation of the results show that a maximum slope is reached between 12 and 15% PV. Above 15% the slope becomes smaller. It is concluded that optimum oil recovery lies between 12 and 15% PV, and the additional oil recovered, above a 15% PV CO sub 2 slug, would not warrant the increased cost of the CO sub 2 . 13 figures, 13 tables. (ERA citation 08:028991)

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