High temperature profile gel for control of oil reservoir permea

Details High temperature profile gel for control of oil reservoir permea High temperature profile gel for control of oil reservoir permea

1995-07-20

1997-03-11

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166300, 507903, 523130, E21B 33138

Patent

active

056092091

ABSTRACT:
A profile control system utilizing an aqueous gelation solution with a controllable gelation delay mechanism for high temperature hydrocarbon producing reservoirs. The gel is produced from the cross-linking of a polyvinylalcohol-co-polyvinylamine copolymer with a dialdehyde or polyaldehyde or an acetal or bisulfite derivative of such aldehyde, catalyzed by acid derived from a latent acid, e.g., a water-soluble trialkylphosphate, as timed-release agent to neutralize the strong base, e.g., NaOH, added to retard gelation. When the pH is reduced to the optimal value, a strong gel forms. The delay time can be programmed by the molar ratio of strong base to latent acid and their total amounts.

REFERENCES:
patent: 4665986 (1987-05-01), Sandiford
patent: 4665987 (1987-05-01), Sandiford et al.
patent: 4896723 (1990-01-01), Hoskin et al.
patent: 5015400 (1991-05-01), Shu
patent: 5071890 (1991-12-01), Shu et al.
patent: 5085787 (1992-02-01), Pinschmidt, Jr. et al.
patent: 5134176 (1992-07-01), Shu

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