Method of restoring permeability around wellbores

Details Method of restoring permeability around wellbores Method of restoring permeability around wellbores

1988-12-19

1989-07-11

Locker, Howard J.

Compositions

Leather or fur treating

166273, 166274, 166275, 1663051, 166311, 166312, 252 8553, 252 8551, C09K 300, E21B 4316, E21B 4325

Patent

active

048469815

ABSTRACT:
The invention is a method of restoring the permeability of an underground hydrocarbon formation adjacent to a wellbore which comprises injecting a first aqueous solution of hydrochloric or hydrofluoric acid into a formation interval where permeability has decreased due to polymer plugging and producing that acid out of the well after a soaking period. A second solution of about 200 ppm to about 2% by weight of chlorine dioxide is injected into the same interval and followed by a third solution of hydrochloric or hydrofluoric acid. The second and third solutions are allowed to soak in the formation for about 4 to about 48 hours before placing the well back on injection or production.

REFERENCES:
patent: 3568772 (1971-03-01), Gogarty et al.
patent: 3648774 (1972-03-01), Kirk
patent: 3709297 (1973-01-01), Christopher, Jr. et al.
patent: 3794523 (1974-02-01), Thompson
patent: 4464268 (1984-08-01), Schievelbein
patent: 4609475 (1986-09-01), Hanlon et al.
patent: 4675120 (1987-06-01), Martucci
patent: 4754809 (1988-07-01), van Zanten et al.

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