# US 9,038,724 B2 · Oxygen scavenger compositions for completion brines

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- Number: US 9,038,724 B2
- Document ID: US9038724B2
- Status: Granted
- Kind: B2
- Application number: 12/947,540
- Filed: 2010-11-16
- Published: 2012-05-17
- Granted: 2015-05-26
- Earliest claimed: 2010-11-16
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Jay Paul Deville
- Inventors: Jay Paul Deville
- Web page: https://patentgrep.com/patent/US9038724B2

## CPC

- C09K 8/86: containing organic compounds
- C09K 8/06: Clay-free compositions (containing inorganic compounds only C09K8/05)
- C09K 8/08: containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells
- C23F 11/10: using organic inhibitors
- C23F 11/124: {Carboxylic acids}
- C23F 11/142: {Hydroxy amines}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25

## Abstract

An oxygen scavenger for completion brines effective and stable in high temperature subterranean formations. In one embodiment, the scavenger contains erythorbate and alkylhydroxlyamine.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The method of claim 1 wherein the oxygen scavenger keeps the oxygen in the brine below about 1 mg/L.

### Claim 3 (depends on 1)

The method of claim 1 wherein the oxygen scavenger keeps the oxygen in the brine below about 0.5 mg/L.

### Claim 4 (depends on 1)

The method of claim 1 wherein the completion operation is drilling through a producing zone of the subterranean formation.

### Claim 5 (depends on 1)

The method of claim 1 wherein the completion operation comprises completing a well drilled through a producing zone of the subterranean formation.

### Claim 6 (depends on 1)

The method of claim 1 wherein the completion operation comprises a workover of the well penetrating the subterranean formation.

### Claim 7 (depends on 1)

The method of claim 1 wherein the oxygen scavenger comprises erythorbate in an amount ranging from 0.01% w/w to 75% w/w and alkylhydroxylamine solution in an amount ranging from 25% w/w to 99.9% w/w.

### Claim 8 (depends on 1)

The method of claim 1 wherein the alkylhydroxylamine is selected from the group consisting of isopropylhydroxylamine, diethylhydroxylamine, tert-butylhydroxylamine, phenylhydroxylamine, cyclohexylhydroxylamine, and benzylhydroxylamine.

### Claim 9 (depends on 1)

The method of claim 1 wherein adding to the brine an oxygen scavenger comprising a blend of erythorbate and alkylhydroxylamine comprises:
adding erythorbate to the brine; and
adding alkylhydroxylamine to the brine.

### Claim 10

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.

### Claim 11 (depends on 10)

The method of claim 10 wherein the wellbore comprises casing and the method further comprises perforating the casing and setting tubing in the wellbore.

### Claim 12 (depends on 10)

The method of claim 10 wherein the brine is used for drilling through a producing zone of the subterranean formation.

### Claim 13 (depends on 10)

The method of claim 10 wherein the brine is used for working over the wellbore.

### Claim 14 (depends on 10)

The method of claim 10 wherein the alkylhydroxylamine is selected from the group consisting of isopropylhydroxylamine, diethylhydroxylamine, tertbutylhydroxylamine, phenylhydroxylamine, cyclohexylhydroxylamine, and benzylhydroxylamine.