Converter type scale remover

Details Converter type scale remover Converter type scale remover

E - Fixed Constructions

21

B

31/13

E21B 43/27 (2006.01) C09K 8/528 (2006.01) C09K 8/78 (2006.01) E21B 43/28 (2006.01)

Patent

CA 1074091

CONVERTER TYPE SCALE REMOVER ABSTRACT OF THE DISCLOSURE 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 con- centration 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.

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