Prevention of inflow of water into wells or shafts which have al

Details Prevention of inflow of water into wells or shafts which have al Prevention of inflow of water into wells or shafts which have al

1977-12-15

1979-05-22

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166300, 405264, E21B 33138

Patent

active

041554051

ABSTRACT:
Prevention of inflow of water into the wells or shafts which are already drilled or are being drilled, by means of a polyacrylamide gel cross-linked with a dialdehyde is disclosed. An aqueous solution of non-hydrolyzed polyacrylamide, with a molecular weight higher than 2,000,000 and with a pH of at least 6.5, is used. A progressive plugging or clogging of the water-productive zone is obtained and the gel which is formed is stable over time and does not undergo any syneresis.

REFERENCES:
patent: 3302717 (1967-02-01), West et al.
patent: 3759197 (1973-09-01), Bracke
patent: 3795276 (1974-03-01), Eilers et al.
patent: 4009755 (1977-03-01), Sandiford

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