Solvent convection technique for recovering viscous petroleum

Details Solvent convection technique for recovering viscous petroleum Solvent convection technique for recovering viscous petroleum

1979-06-07

1981-10-06

Leppink, James A.

Wells

Processes

Distinct, separate injection and producing wells

166271, E21B 4322

Patent

active

042930359

ABSTRACT:
Disclosed is a method of producing viscous hydrocarbons from a viscous petroleum-containing subsurface formation. At least an injection well and a production well are provided to extend from the surface of the earth into the subsurface formations. A high mobility, brine-filled channel is established through the lower portion of the subsurface formation to communicate with the injection and production well. After the high mobility channel is established, a solvent for the petroleum is injected into the high mobility channel. The injection of the solvent is continued until breakthrough of the solvent at the production well and thereafter until the ratio of petroleum to solvent produced from the production well becomes unfavorable. Thereafter, gas is injected into the high mobility channel to displace the solvent and petroleum from the formation to the production well.

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