# US 8,772,206 B2 · Treatment fluids made of halogenisocyanuric acid and its salts for operations in a well

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- Number: US 8,772,206 B2
- Document ID: US8772206B2
- Status: Granted
- Kind: B2
- Application number: 12/784,912
- Filed: 2010-05-21
- Published: 2011-11-24
- Granted: 2014-07-08
- Earliest claimed: 2010-05-21
- Assignees: Schlumberger Technology Corporation
- Applicants: Andrey Mirakyan; Syed A. Ali; Curtis L. Boney; Kevin W. England; Michael D. Parris; Kristel A. Blow
- Inventors: Andrey Mirakyan; Syed A. Ali; Curtis L. Boney; Kevin W. England; Michael D. Parris; Kristel A. Blow
- Web page: https://patentgrep.com/patent/US8772206B2

## CPC

- C09K 8/68: containing organic compounds
- C09K 8/845: {containing inorganic compounds}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The invention discloses a method comprising providing a fluid comprising a viscosifying agent in an aqueous medium; contacting the fluid with a halogenisocyanuric acid or halogenisocyanurate component; whereby the viscosity of the fluid with the halogenisocyanuric acid or halogenisocyanurate component is reduced compared to the viscosity of the fluid alone; and introducing the fluid into a well. The halogenisocyanuric acid component can be mono chloroisocyanuric acid, dichloroisocyanuric acid or trichloroisocyanuric acid. The halogenisocyanurate component can be an alkali metal monochloroisocyanurate, alkali metal dichloroisocyanurate or alkali metal trichloroisocyanurate.

## Claims

### Claim 1

A method comprising:
providing a fluid comprising a viscosifying agent in an aqueous medium;
contacting the fluid with an halogenisocyanuric acid selected from the group consisting of mono bromoisocyanuric acid, dibromoisocyanuric acid and tribromoisocyanuric acid; and
contacting the fluid with cyanuric acid;
whereby the viscosity of the fluid with the halogenisocyanuric acid is reduced compared to the viscosity of the fluid alone; and introducing the fluid into a well.

### Claim 2 (depends on 1)

The method of claim 1, wherein the aqueous medium is oilfield produced water, fresh water, seawater, brine water or mixture thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the viscosifying agent is, crosslinked or un-crosslinked polymer, friction reducer, or viscoelastic surfactant.

### Claim 4 (depends on 3)

The method of claim 3, wherein the friction reducer is polyacrylamide.

### Claim 5 (depends on 4)

The method of claim 4, wherein the polyacrylamide is either anionic or cationic.

### Claim 6 (depends on 1)

The method of claim 1, wherein the fluid further comprises surfactant, emulsion, scale inhibitor, biocide or mixture thereof.

### Claim 7 (depends on 1)

The method of claim 1, further comprising: introducing proppant into the well.

### Claim 8 (depends on 1)

The method of claim 1, further comprising: energizing or foaming the fluid with a gas.

### Claim 9 (depends on 8)

The method of claim 8, wherein the gas is carbon dioxide, nitrogen, air, or combined.

### Claim 10 (depends on 1)

The method of claim 1, wherein the halogenisocyanuric acid concentration is from about 0.5 gpt to 2 gpt based on the volume of the fluid.

### Claim 11 (depends on 1)

The method of claim 1, wherein the viscosity of the fluid alone is above about 2.5 centipoises at a temperature of about 32° C.

### Claim 12 (depends on 1)

The method of claim 1, wherein the viscosity of the fluid with the halogenisocyanuric acid is below about 1 centipoise at a temperature of about 32° C.

### Claim 13 (depends on 1)

The method of claim 1, wherein the cyanuric acid concentration is from about 25 ppm to about 30 ppm based on the weight of the fluid.

### Claim 14

A method of treating a subterranean formation in a well comprising: providing a fluid comprising a viscosifying agent in an aqueous medium; contacting the fluid with an halogenisocyanuric acid selected from the group consisting of mono bromoisocyanuric acid, dibromoisocyanuric acid or tribromoisocyanuric acid; and contacting the fluid with cyanuric acid whereby the viscosity of the fluid with the halogenisocyanuric acid is reduced compared to the viscosity of the fluid alone; introducing the fluid into the well; and allowing the fluid to contact the subterranean formation.

### Claim 15 (depends on 14)

The method of claim 14, wherein the viscosity of the fluid alone is above about 2.5 centipoises at a temperature of about 32° C.

### Claim 16 (depends on 14)

The method of claim 14, wherein the viscosity of the fluid with the halogenisocyanuric acid is below about 1 centipoise at a temperature of about 32° C.

### Claim 17 (depends on 14)

The method of claim 14, wherein the aqueous medium is oilfield produced water, fresh water, seawater, brine water or mixture thereof.

### Claim 18 (depends on 14)

The method of claim 14, wherein the viscosifying agent is, crosslinked or un-crosslinked polymer, friction reducer, or viscoelastic surfactant.

### Claim 19 (depends on 18)

The method of claim 18, wherein the friction reducer is an anionic, cationic, or nonionic friction-reducing additive, including acrylamide polymers and copolymers polyacrylamide.

### Claim 20 (depends on 18)

The method of claim 18, wherein the friction reducer is polysaccharide including guar and derivatized guar.