# US 10,119,066 B1 · Glutamic diacetic acid-containing aqueous fluid composition

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- Number: US 10,119,066 B1
- Document ID: US10119066B1
- Status: Granted
- Kind: B1
- Application number: 16/034,964
- Filed: 2018-07-13
- Published: 2018-11-08
- Granted: 2018-11-06
- Earliest claimed: 2017-03-15
- Assignees: King Fahd University of Petroleum and Minerals
- Applicants: King Fahd University of Petroleum and Minerals
- Inventors: Mohamed Ahmed Nasr El-Din Mahmoud; Salah El-Din Elkatatny; Marwan Nagm Eldeen Mohammad
- Web page: https://patentgrep.com/patent/US10119066B1

## CPC

- C09K 8/68: containing organic compounds
- C09K 8/52: Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K 8/685: {containing cross-linking agents}
- C09K 8/725: {Compositions containing polymers}
- C09K 8/74: combined with additives added for specific purposes
- C09K 8/80: Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K 8/88: macromolecular compounds
- C09K 8/882: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- C09K 8/887: {containing cross-linking agents}
- E21B 43/267: reinforcing fractures by propping
- C09K 2208/12: Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
- C09K 2208/28: Friction or drag reducing additives
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A fracturing fluid composition that includes a chelating agent, e.g. GLDA, and a polymeric additive comprising a copolymer of acrylamido-tert-butyl sulfonate and hydrolyzed polyacrylamide diluted in an aqueous base fluid, e.g. seawater, and a method of fracking a geological formation using the fracturing fluid composition. Various embodiments of the fracturing fluid composition and the method of fracking are also provided.

## Claims

### Claim 1

A fracturing fluid composition, comprising:
an aqueous base fluid;
a chelating agent comprising glutamic diacetic acid in an amount of 5-20 wt %, wherein wt % is relative to the total weight of the fracturing fluid composition; and
a polymeric additive comprising a copolymer of acrylamido-tert-butyl sulfonate and partially hydrolyzed polyacrylamide, in an amount of 0.45-1 wt %, wherein wt % is relative to the total weight of the fracturing fluid composition;
wherein a weight percent of acrylamindo-tert-butyl sulfonate in the copolymer is in the range of 5 to 20 wt %, and a weight percent of the partially hydrolyzed polyacrylamide in the copolymer is in the range of 80 to 95 wt %, each relative to the total weight of the copolymer.

### Claim 2 (depends on 1)

The fracturing fluid composition of claim 1, wherein the aqueous base fluid is seawater.

### Claim 3 (depends on 1)

The fracturing fluid composition of claim 1, which does not include, other than the chelating agent and the polymeric additive, additional additives selected from the group consisting of an antiscalant, a deflocculant, a crosslinker, a breaker, a fluid loss additive, a buffer, an interfacial tension reducer, and a biocide.

### Claim 4 (depends on 1)

The fracturing fluid composition of claim 1, which has a plastic viscosity of 2 to 8 cP at a temperature of 280 to 320° F.

### Claim 5 (depends on 1)

The fracturing fluid composition of claim 1, which has a yield point of 2 to 15 lb/100 ft2 at a temperature of 280 to 320° F.

### Claim 6 (depends on 1)

The fracturing fluid composition of claim 1, wherein a weight percent of acrylamido-tert-butyl sulfonate in the copolymer is in the range of 5 to 10 wt %, relative to the total weight of the copolymer.

### Claim 7 (depends on 1)

The fracturing fluid composition of claim 1, wherein the partially hydrolyzed polyacrylamide has a molar ratio of amide groups to carboxylate groups of 0.1:1 to 10:1.

### Claim 8 (depends on 1)

The fracturing fluid composition of claim 1, wherein a weight percent of acrylamido-tert-butyl sulfonate in the copolymer is in the range of 5 to 10 wt %, and a weight percent of partially hydrolyzed polyacrylamide in the copolymer is in the range of 90 to 95 wt %, each relative to the total weight of the copolymer.