Method of restoring permeability around wellbores

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

C - Chemistry, Metallurgy

09

K

166/25

C09K 3/00 (2006.01) C09K 8/52 (2006.01) C09K 8/84 (2006.01) E21B 43/16 (2006.01) E21B 43/25 (2006.01)

Patent

CA 1297784

METHOD OF RESTORING PERMEABILITY AROUND WELLBORES (D#78,894-F) ABSTRACT OF THE DISCLOSURE 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.

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