Method of improving injectivity profiles and/or vertical conform

Details Method of improving injectivity profiles and/or vertical conform Method of improving injectivity profiles and/or vertical conform

1977-07-01

1978-07-04

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166273, 166294, E21B 33138, E21B 4322

Patent

active

040983374

ABSTRACT:
Improved injectivity profiles and/or vertical conformance in flooding heterogeneous formations containing high permeability zones is obtained by injecting an aqueous polyacrylamide solution and an aqueous formaldehyde solution into the formation and allowing the polyacrylamide to react with the formaldehyde in the relatively high permeability zones to form a gel. Thereafter, improved sweep efficiency is realized in displacing hydrocarbon from the lesser permeability zones.

REFERENCES:
patent: 3396790 (1968-08-01), Eaton
patent: 3603397 (1971-09-01), Peray
patent: 3741307 (1973-06-01), Sandiford
patent: 3749172 (1973-07-01), Hessert et al.
patent: 3762476 (1973-10-01), Gall
patent: 3841405 (1974-10-01), Moote et al.
patent: 3949811 (1976-04-01), Threlkeld et al.
patent: 3981363 (1976-09-01), Gall
patent: 4009755 (1977-03-01), Sandiford

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