E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/33
E21B 33/138 (2006.01) C09K 8/518 (2006.01) C09K 8/58 (2006.01) E21B 43/20 (2006.01) E21B 43/26 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1064818
MISCIBLE DRIVE IN HETEROGENEOUS RESERVOIRS ABSTRACT OF THE DISCLOSURE A method of improving the sweep efficiency and increasing oil recovery of miscible flooding without reducing injectivity of the injec- tion wells. Two sets of wells are used with one set being drilled bet- ween the other sets. The interwell area of a reservoir is pretreated by injecting a permeability-reducing agent (preferably a polymer) through said first set of wells. The polymer enters the more permeable zones and partially plugs them, both near and away from the wellbore. Ther- eafter, the injection or first set of wells are converted to producing wells. After the step of reducing the permeability contrast of the het- erogeneous reservoirs, a miscible slug, that may or may not be preceded by a controlled salinity preflush, is injected into the second set of wells. There is no reduction in injectivity of the miscible injection wells, because no permeability-reducing agent has been injected thereth- rough. Reduced permeability contrast results in improved volumetric sweep efficiency and increased oil recovery by the miscible fluid slug. The method is particularly useful in reservoirs with communication bet- ween various permeability zones where crossflow of fluids can be detri- mental to flooding efficiency.
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