Corrosion inhibitors for clear, calcium-free high density fluids

Details Corrosion inhibitors for clear, calcium-free high density fluids Corrosion inhibitors for clear, calcium-free high density fluids

1986-09-30

1988-11-15

Guynn, Herbert B.

Compositions

Leather or fur treating

252 8514, 252 8555, 25238961, 25238962, E21B 4300, E21B 4102, C09K 702

Patent

active

047847794

ABSTRACT:
The present invention relates to corrosion inhibitors which can be used with calcium-free drilling, completion and workover fluids in carbonate or sulfate containing wells. More particularly, the invention relates to the use of sodium, ammonium and/or calcium thiocyanate alone, or in combination with specific aldose group antioxidants, as corrosion inhibitors. Aldose group antioxidants include arabinose, ascorbic acid, isoascorbic acid, gluconic acid, alkali metal, and alkaline earth or other metal ascorbates, isoascorbates and gluconates and mixtures thereof. Additionally, ammonium thioglycolate may be incorporated as a further corrosion inhibitor.

REFERENCES:
patent: 4292183 (1981-09-01), Sanders
patent: 4420406 (1983-12-01), House et al.
patent: 4536302 (1985-08-01), Augsburger et al.
patent: 4539122 (1985-09-01), Son et al.
patent: 4554081 (1985-11-01), Borchardt et al.
patent: 4609476 (1986-09-01), Heilweil
patent: 4619773 (1986-10-01), Heilweil et al.

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