Controlled well plugging with dilute polymer solutions

Details Controlled well plugging with dilute polymer solutions Controlled well plugging with dilute polymer solutions

1975-11-06

1977-04-19

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166294, E21B 33138

Patent

active

040182860

ABSTRACT:
A method is provided for plugging an underground formation in which a composition of water, a polymer capable of gelling in the presence of a crosslinking agent, and a crosslinking agent capable of gelling the polymer are injected into an underground formation with maintenance of the pH in the underground formation within the range of about 3 to about 7. In an embodiment of the invention plugging of the underground formation can be removed by decreasing the pH in the formation below 3 or increasing the pH in the formation above 7.

REFERENCES:
patent: 3223162 (1965-12-01), Burge
patent: 3306870 (1967-02-01), Eilers et al.
patent: 3421584 (1969-01-01), Eilers et al.
patent: 3502149 (1970-03-01), Pence, Jr.
patent: 3687200 (1972-08-01), Routson
patent: 3701384 (1972-10-01), Routson et al.
patent: 3730272 (1973-05-01), Richardson et al.
patent: 3762476 (1973-10-01), Gall
patent: 3794115 (1974-02-01), Skagerberg
patent: 3795276 (1974-03-01), Eilers et al.

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