Oil recovery process for stratified high salinity reservoirs

Details Oil recovery process for stratified high salinity reservoirs Oil recovery process for stratified high salinity reservoirs

1983-04-11

1984-07-10

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166269, E21B 4322

Patent

active

044587600

ABSTRACT:
There is provided a process for improving oil recovery from stratified reservoirs by (1) injecting low saline water to reduce the salinity in high permeability zones, (2) injecting a surfactant solution into the high permeability zones, (3) injecting high salinity water into the reservoir, thereby forming a surfactant/water/oil emulsion which reduces effective brine permeability in the high permeability zones, and (4) continuing to inject high salinity water into the reservoir, whereby water is diverted to low permeability zones and oil is recovered from the low permeability zones. Low salinity water may then be injected to break-up or release the emulsion in the high permeability zones and to recover oil from the high permeability zones.

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patent: 4421168 (1983-12-01), Hurd

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