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US 8,573,300 B2Granted
Reducing sulfide in oil reservoir production fluids
AssigneeE. I. Du Pont de Nemours and Company
InventorsAlbert W. Alsop, Robert D. Fallon, Scott Christopher Jackson
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Abstract
Methods are provided for treating production fluid in an oil reservoir to reduce the amount of sulfide in the production fluid. The production fluid is treated with nitrate and/or nitrite ions in an aqueous solution that is added to an injection well that is in contact with the production well.
Claims11
A method for treating an oil reservoir comprising:
- a) providing an injection well in an oil reservoir;
- b) adding a nitrate/nitrite aqueous solution comprising nitrate ions, nitrite ions, or a mixture of nitrate and nitrite ions to the injection well wherein said solution flows down the well and into the oil reservoir, and contacts a mixture of water and oil in the oil reservoir that forms production fluid;
- and
- c) producing the production fluid through at least one production well that is in contact with the injection well;
- wherein a sulfide concentration in the production fluid is reduced as compared to a sulfide concentration in production fluid obtained with omission of step (b), wherein the total concentration of nitrate ions, nitrite ions, or the mixture of nitrate and nitrite ions in the aqueous solution of (b) is greater than about 3,000 ppm.
2 more elements
Dependencies are inferred from the claim text.