Process for improving conformance and flow profiles in a subterr

Details Process for improving conformance and flow profiles in a subterr Process for improving conformance and flow profiles in a subterr

1980-06-30

1981-12-08

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166300, E21B 33138

Patent

active

043043011

ABSTRACT:
An aqueous caustic solution and an aqueous solution containing a polyvalent cation dissolved therein are sequentially injected into the near well bore environment of a subterranean formation interposed by a hydrocarbon spacer. The spacer causes the two aqueous solutions to mix in the near well bore environment and an insoluble precipitate is formed which preferentially reduces the permeability of the relatively highly permeable zones in the near well bore environment thereby improving conformance and flow profiles of fluids subsequently injected into or produced from the formation.

REFERENCES:
patent: 2001350 (1935-05-01), Mills
patent: 2294078 (1942-08-01), Dow et al.
patent: 2807324 (1957-09-01), King et al.
patent: 2837163 (1958-06-01), Romas et al.
patent: 3593793 (1971-07-01), Kelseaux
patent: 3658131 (1972-04-01), Biles
patent: 3718189 (1973-02-01), Terry
patent: 3837400 (1974-09-01), Martin
patent: 4081029 (1978-03-01), Holm
patent: 4140183 (1979-02-01), Holm

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