Process for the correction of oil well productivity and/or injec

Details Process for the correction of oil well productivity and/or injec Process for the correction of oil well productivity and/or injec

1985-05-06

1987-02-17

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166270, 166294, E21B 33138

Patent

active

046432540

ABSTRACT:
A process for the correction of oil well productivity, or injection profiles, or both, is disclosed. The process includes injecting a dilute solution of hydrochloric acid having a concentration less than 1% via an oil well into an adjacent subsurface formation, followed by injecting a solution of sodium silicate and hydrochloric acid into the formation, and then shutting in the well for several hours. The dilute hydrochloric acid solution and the sodium silicate-hydrochloric acid solution may each be displaced into the formation with injection water. Best results are achieved when systems based on sodium silicate and hydrochloric acid of long-curing time are injected, followed by systems based on sodium silicate and hydrochloric acid of short-curing time.

REFERENCES:
patent: 2198120 (1940-04-01), Lerch et al.
patent: 2207759 (1940-07-01), Reimers
patent: 2236147 (1941-03-01), Lerch et al.
patent: 2237313 (1941-04-01), Prutton
patent: 3285338 (1966-11-01), Boston
patent: 3375872 (1968-04-01), McLaughlin et al.
patent: 4069869 (1978-01-01), Sandiford
patent: 4081029 (1978-03-01), Holm
patent: 4141416 (1979-02-01), Holm
patent: 4325433 (1982-04-01), Yen et al.
patent: 4332297 (1982-06-01), Sandiford

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