Recovering hydrocarbons from tar sand or heavy oil reservoirs

Details Recovering hydrocarbons from tar sand or heavy oil reservoirs Recovering hydrocarbons from tar sand or heavy oil reservoirs

1992-11-12

1994-06-07

Suchfield, George A.

Wells

Processes

Cyclic injection then production of a single well

166 50, 166272, E21B 4324

Patent

active

053181247

ABSTRACT:
Method of recovering fluids from an underground tar sand reservoir or heavy oil reservoir comprising (a) drilling and completing a first pair of wells and a second pair of wells, each pair comprising an injection well terminating in the reservoir and a production well terminating in the reservoir below the injection well; (b) circulating steam through the injection wells and performing alternate steam injection and fluid production through the production wells; and (c) injecting steam through the injection wells while producing fluids through the production wells, wherein the injection pressure of the injection well of the first pair of wells is greater than the injection pressure of the injection well of the second pair of wells.

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