Method of matrix acidizing

Details Method of matrix acidizing Method of matrix acidizing

1991-10-24

1993-05-04

Novosad, Stephen J.

Wells

Processes

Separate steps of fracturing or attacking formation

166307, E21B 4327

Patent

active

052077780

ABSTRACT:
This invention is directed to a method to improve matrix acidizing of a carbonate containing formation by taking advantage of wormholes which are created during acidizing. The wormholes are closed with a solidifiable gel which protects them from entry of additional acid. The solidifiable gel is allowed sufficient time to form a solid. After a solid gel is formed, additional acid is directed into the formation where it moves past the wormholes containing the solid gel. Thereafter, an additional volume of solidifiable gel is directed into the formation where it protects any subsequently formed wormholes and diverts the acid further into the formation. An additional volume of acid is directed into the formation and the steps repeated until the formation has been acidized to obtain a desired degree of permeability.

REFERENCES:
patent: 2850098 (1958-09-01), Moll et al.
patent: 3076762 (1963-02-01), Dill
patent: 3233672 (1966-02-01), Carpenter
patent: 3354957 (1967-11-01), Every et al.
patent: 4007789 (1977-02-01), Clampitt
patent: 4237974 (1980-12-01), Scherubel
patent: 4787456 (1988-11-01), Jennings, Jr. et al.

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