Wells – Processes – Distinct – separate injection and producing wells
Patent
1985-09-11
1987-02-03
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166292, E21B 4316
Patent
active
046403574
ABSTRACT:
Hydrocarbons are recovered from a fractured or stratified subsurface formation by means of at least one injection well and at least one production well. A first flooding agent having a high viscosity is injected into the formation to form a filtercake on the walls of the fractures or permeable streaks of the formation only in the near vicinity of the injection well. A second flooding agent having an inorganic thickener is injected deep into the formation to completely fill the thief zones provided by the fractures or permeable streaks of the formation between the injection and production wells. A first flushing agent is then injected to clear the fractures or permeable streaks of the formation only in the near vicinity of the injection well of the inorganic thickener. A second flushing agent having a breaker material is injected to remove the filtercake from the walls of the fractures or permeable streaks of the formation only in the near vicinity of the injection well. A third flooding agent having a low viscosity is injected to flood the reservoir through the open pore spaces made available by the removal of the filtercake near the injection well.
REFERENCES:
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Gilman Michael G.
Hager Jr. George W.
Kisliuk Bruce M.
McKillop Alexander J.
Mobil Oil Corporation
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