Miscible flooding and water production of previously water...

Details Miscible flooding and water production of previously water... Miscible flooding and water production of previously water...

E - Fixed Constructions

21

B

166/32

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

Patent

CA 1227420

MISCIBLE FLOODING AND WATER PRODUCTION OF PREVIOUSLY WATER FLOODED RESERVOIRS (D#77,400-TCRL-011) ABSTRACT The invention is a tertiary hydrocarbon recovery method to be used with reservoirs which do not communicate with an aquifer and that have been previously waterflooded. The method is performed by injecting a miscible solvent into the reservoir to form an oil bank from the hydrocarbons therein. Water is con- currently produced from the waterflooded region of the reservoir. The oil bank, followed by the miscible solvent, is driven through the waterflooded region of the reservoir to resaturate the water- flooded region with oil. The following miscible solvent bank sweeps the oil from the region newly resaturated with oil. Complete production of the oil is delayed until after the leading edge of the oil bank has passed through the previously water- flooded regions of the reservoir.

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