Method for scale removal in a wellbore

Details Method for scale removal in a wellbore Method for scale removal in a wellbore

1991-08-16

1992-09-15

Suchfield, George A.

Wells

Processes

Cleaning or unloading well

134 3, 1663091, 252 8552, E21B 3700

Patent

active

051469880

ABSTRACT:
A method for removing calcium sulfate scale from a well comprising mixing carbon dioxide and water at a downhole location within the well to form an acidic solution containing an equilibrium mixture of carbonic acid, bicarbonate and carbonate ions that will convert the calcium sulfate scale to calcium carbonate scale and subsequent in situ dissolution of the calcium carbonate scale into the acidic solution that flows into the formation about the well.

REFERENCES:
patent: 2787326 (1957-04-01), Hughes
patent: 2964109 (1960-12-01), Martin
patent: 3651868 (1972-03-01), Caudle et al.
patent: 4188068 (1980-02-01), Holmes et al.
patent: 4778006 (1988-10-01), Derowitsch

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