Carbon dioxide miscible displacement process

Details Carbon dioxide miscible displacement process Carbon dioxide miscible displacement process

E - Fixed Constructions

21

B

166/33

E21B 43/20 (2006.01) E21B 43/16 (2006.01) E21B 43/18 (2006.01)

Patent

CA 1237980

Abstract There is provided a reliable carbon dioxide miscible displacement process wherein a propane-rich in place oil transition zone is created by huff and puff techniques. The enriched oil transition zone uses less LPG solvent per unit volume and is less critical or has greater tolerance to reservoir conditions than a carbon dioxide process would otherwise have if the propane were injected as a displacing slug. The huff stage of injec- tion of the propane material may be followed by a period of shut in. The process may be repeated several times. Propane injection also demethanizes the zone around the injection well, thereby removing methane which interferes with development of miscibility between carbon dioxide and in place oil. After creation of the transition zone, carbon dioxide with or without other fluids is injected to displace oil from the reservoir.

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