Converter type scale remover

Details Converter type scale remover Converter type scale remover

1977-02-22

1978-08-22

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

166307, 252 855B, E21B 4327, E21B 4328

Patent

active

041082460

ABSTRACT:
A process and composition are described for use in removing calcium sulfate scale from a well. An aqueous converter solution of sodium (or 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: 2386605 (1945-10-01), Harton, Jr.
patent: 2396938 (1946-03-01), Bersworth
patent: 2679294 (1954-05-01), Bond et al.
patent: 2787326 (1957-04-01), Hughes
patent: 3170815 (1965-02-01), White
patent: 3283816 (1966-11-01), Bradley
patent: 3547194 (1970-12-01), Morine
patent: 3688829 (1972-09-01), Jones

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