Converter type scale remover

Details Converter type scale remover Converter type scale remover

1977-11-17

1979-05-22

Guynn, Herbert B.

Compositions

Leather or fur treating

166312, 252 82, 252 86, E21B 4327, E21B 3700, C02B 506

Patent

active

041558570

ABSTRACT:
A process and composition are described for use in removing calcium sulfate scale from a well. An aqueous converter solution of sodium (for potassium or possibly ammonium) gluconates, hydroxides, and carbonates is used to convert the calcium sulfate into an acid soluble form, which can be removed by an acid rinse. In the aqueous converter solution, the weight ratio of hydroxide to carbonate is between about 3:2 and about 5:1, and the weight ratio of gluconate to the total amount of hydroxide and carbonate is between about 2:1 and about 5:1. The concentration of the combination of gluconate, hydroxide, and carbonate is between about 15% and about 50%. Preferably, the solution is by weight approximately 25% sodium gluconate, 5.3% sodium hydroxide, 1.8% sodium carbonate, and the remainder water.

REFERENCES:
patent: 2396938 (1946-03-01), Bersworth
patent: 2584017 (1952-01-01), Dvorkovitz et al.
patent: 2615846 (1952-10-01), Dvorkovitz et al.
patent: 2787326 (1957-04-01), Hughes
patent: 2976248 (1961-03-01), Otrhalek
patent: 3688829 (1972-09-01), Jones
patent: 3808143 (1974-04-01), Gardner

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