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US 4,059,533 AGranted
Oxygen scavenging methods and additives
AssigneeHalliburton Company
InventorsJimmie L. Watson, Leroy L. Carney
Life of this patent
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Abstract
This invention relates to methods and additives for scavenging oxygen dissolved and entrained in liquids which are particularly suitable for removing dissolved and entrained oxygen from polymer-containing fluids used in drilling and completing well bores as well as water flood and other procedures carried out in the oil field. The oxygen scavenger additive is sodium dithionite or a mixture thereof with sodium dithionate dispersed in a liquid carrier such as a hydrocarbon.
Claims5
A method of maintaining the oxygen concentration in an aqueous fluid at a very low concentration comprising;
- adding to said aqueous fluid an oxygen scavenging composition comprising a carrier liquid having dispersed therein sodium dithionite or a mixture thereof with sodium dithionate, said carrier liquid containing a thickening agent to suspend therein said sodium dithionite or a mixture of sodium dithionite with sodium dithionate, wherein said carrier liquid is selected from the group consisting of liquid aliphatic hydrocarbon, liquid aromatic hydrocarbon and mixtures thereof.
Dependencies are inferred from the claim text.