Polymers for oil reservoir permeability control

Details Polymers for oil reservoir permeability control Polymers for oil reservoir permeability control

1984-11-29

1989-05-30

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166294, E21B 33138

Patent

active

048341827

ABSTRACT:
Improved polymer gels for oil reservoir permeability control have a continuous, cross-linked polymer phase having a relatively low density of cross-linking with domains of clustered, high density cross-linking. The clustered high density cross-linkings contribute to the gel's shear stability and gel strength while the continuous, low density phase contributes to good injectivity. Gels of this kind are produced by cross-linking a base polymer with a relatively low density of cross-linking sites with a reinforcing polymer having a higher cross-linking site density. Suitable polymers have ligand groups which are capable of forming coordination cross-linkages with polyvalent metals, especially chromium and include polyacrylamides as base polymers and polyacrylic acids as reinforcing polymers.

REFERENCES:
patent: 3909423 (1975-09-01), Hessert et al.
patent: 3981363 (1976-09-01), Gall
patent: 4009755 (1977-03-01), Sandiford
patent: 4040484 (1977-08-01), Hessert
patent: 4069869 (1978-01-01), Sandiford
patent: 4413680 (1983-11-01), Sandiford et al.

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