Oxygen scavenger compositions for completion brines
AssigneeHalliburton Energy Services, Inc.
InventorJay Paul Deville
Life of this patent
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Abstract
An oxygen scavenger for completion brines effective and stable in high temperature subterranean formations. In one embodiment, the scavenger contains erythorbate and alkylhydroxlyamine.
Claims14
A method for reducing the amount of oxygen in an oxygen containing brine that is clear and colorless, having an NTU of less than 20, during use in a completion operation in a subterranean formation having a temperature of at least 275° F. but not exceeding 500° F., without adversely affecting the clearness and color of the brine, the method comprising adding to the brine an oxygen scavenger comprising a blend of erythorbate and alkylhydroxylamine, such that the brine remains clear and colorless, or has an NTU of less than 20, at 275° F., after addition of the oxygen scavenger.
A method of completing a wellbore penetrating a subterranean formation comprising employing a completion fluid comprising a clear, colorless brine and an oxygen scavenger containing alkylhydroxlyamine and a compound selected from the group consisting of erythorbate, ascorbate, ascorbic acid, and erythorbic acid, wherein the brine remains clear and colorless, or has an NTU of less than 20, after the oxygen scavenger has been included in the completion fluid and after the completion fluid is placed in at least a portion of the subterranean formation having a temperature of at least 275° F. but not exceeding 500° F.
Dependencies are inferred from the claim text.