Method for rejuvenation of injection wells

Details Method for rejuvenation of injection wells Method for rejuvenation of injection wells

1993-10-01

1995-02-14

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166273, 166307, 166312, E21B 4322, E21B 4327

Patent

active

053886461

ABSTRACT:
An injection well has become plugged with an accumulation of undesirable material that is causing the wellhead pressure required to effect a selected minimum flow rate of injection fluid into the formation to have increased to a maximum value. The method of this invention provides a process for treating the plugged formation to remove the accumulated undesirable material. The process requires a plurality of treatment cycles, and in each cycle injection fluid flows into the wellhead for a first time interval while injecting treatment chemical into the flowing injection fluid during a second time interval, with the first time interval being much longer than the second time interval. The well is acidized after a multiplicity of cycles and returned to operation.

REFERENCES:
patent: 2787326 (1957-04-01), Hughes
patent: 3532168 (1970-10-01), Webb
patent: 3612182 (1971-10-01), Raifsnider
patent: 3616852 (1971-11-01), Allen
patent: 3638729 (1972-02-01), Parker
patent: 3648775 (1972-03-01), Dixon
patent: 3756319 (1973-09-01), Holm et al.
patent: 4279305 (1981-07-01), Knapp et al.
patent: 5193617 (1993-03-01), D'Souza

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