Corrosion inhibitor for heavy brines
AssigneeHalliburton Company
InventorsAdelina J. Son, Mark S. Kuzlik
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Abstract
The present invention provides a method for reducing the corrosive effects of a heavy brine upon a metal by admixing a quantity of a selected corrosion inhibitor with the brine solution. The corrosion inhibitor can comprise at least one member selected from the group consisting of a monovalent or divalent salt of erythorbic acid, a molybdate salt, ferrous gluconate and sodium gluconate. The brine solution can contain potassium, sodium, calcium or zinc halide salts. The corrosion inhibitor can be used in drilling, completion, packer and workover fluids.
Claims16
A method of inhibiting corrosion of ferrous metals in contact with heavy brine solutions containing at least one heavy salt selected from the group consisting of potassium halides, sodium halides, calcium halides and zinc halides, said solutions having a density in excess of about 10 lbs/gallon comprising admixing with said brine solution a corrosion inhibitor comprising a monovalent or divalent salt of erythorbic acid, said inhibitor being present in an amount of at least about 0.1 pound per barrel of said brine solution.
A method for protecting metals from the corrosive effects of heavy brine solutions having a density in excess of about 10 lbs/gallon comprising:
- admixing with said brine solution comprising at least one salt selected from the group consisting of potassium halides, sodium halides, calcium halides and zinc halides, a corrosion inhibitor comprising a monovalent or divalent salt of erythorbic acid in an amount in excess of about 0.1 pound per barrel of said brine solution whereby the corrosive effects of said heavy brine solution upon said metals are reduced.
A corrosion inhibitor composition for use in heavy brine solutions having a density in excess of 10 pounds per gallon comprising at least one member selected from the groups consisting of a monovalent or divalent salt of erythorbic acid, sodium gluconate and ferrous gluconate.
Dependencies are inferred from the claim text.