Gel compositions for hydraulic fracturing applications

Patent metadata

Field	Value
Publication number	US-2016009983-A1
Application number	US-201414770668-A
Country	US
Kind code	A1
Filing date	Feb 28, 2014
Priority date	Feb 28, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

Gel compositions comprising an acrylamide polymer or copolymer crosslinked with dialdehyde, methods to produce the gel compositions, welibore treatment fluids comprising the gel compositions, and methods of treating a well bore comprising injecting the gel compositions, are provided. In the drilling, completion, and stimulation of oil and gas wells, well treatment fluids are often pumped into well bore holes under high pressure and at high flow rates causing the rock formation surrounding the well bore to fracture.

First claim

1 . A gel composition comprising an acrylamide polymer or copolymer crosslinked with dialdehyde wherein the gel composition is formed by combining the acrylamide polymer or copolymer and dialdehyde in an aqueous solution at a pH in the range of about 7.5 to about 11, and wherein the acrylamide polymer or copolymer has a charge between about 15 to about 35%, and wherein the molar ratio of dialdehyde to monomers of the acrylamide polymer or copolymer is in the range of about greater than about 0.2 to about 2.0.

2 . The gel composition of claim 1 , wherein the charge is about 15 to about 20%.

3 . The gel composition of claim 1 , wherein the molar ratio of dialdehyde to monomers of the acrylamide polymer or copolymer is in the range of about greater than about 1.0 to about 2.0.

4 . The gel composition of claim 1 , wherein the dialdehyde is selected from the group consisting of glyoxal, malondialdehyde, succindialdehyde, glutaraldehyde, adipaldehyde, o-phthaldehyde, m-phthaldehyde, p-phthaldehyde, and mixtures thereof.

5 . The gel composition of claim 4 , wherein the dialdehyde is glyoxal.

6 . The gel composition of claim 1 , wherein the pH is between about 9 and about 11.

7 . A wellbore treatment fluid comprising the gel composition of claim 1 .

8 . The wellbore treatment fluid of claim 7 , wherein the molar ratio of dialdehyde to monomers of the acrylamide polymer or copolymer is in the range of about greater than about 1.0 to about 2.0.

9 . The wellbore treatment fluid of claim 7 , further comprising a proppant.

10 . The wellbore treatment fluid of claim 9 , wherein the proppant is natural or synthetic proppants, selected from glass beads, ceramic beads, sand, gravel, and bauxite or combinations thereof.

11 . The wellbore treatment fluid of claim 9 , wherein the proppant is coated or contain chemicals.

12 . The wellbore treatment fluid of claim 9 , wherein the proppant is resin coated (curable), or pre-cured resin coated.

13 . The wellbore treatment fluid of claim 7 , further comprising a one or more oilfield additives selected from the group consisting of antifoams, scale inhibitors, H 2 S and or O 2 scavengers, biocides, crosslinking agents, surface tension reducers, breakers, buffers, surfactants and non-emulsifiers, fluorocarbon surfactants, clay stabilizers, fluid loss additives, foamers, friction reducers, temperature stabilizers, diverting agents, shale and clay stabilizers, paraffin/asphaltene inhibitors and corrosion inhibitors.

14 . The wellbore treatment fluid of claim 7 , further comprising a one or more additives, including, but not limited to, acids, fluid loss control additives, gas, corrosion inhibitors, scale inhibitors, catalysts, clay control agents, biocides and friction reducers.

15 . A method to produce a gel composition comprising combining or contacting an acrylamide polymer or copolymer component with a dialdehyde component in an aqueous medium at a pH in the range of about 7.5 to about 11, and wherein the molar ratio of dialdehyde to monomers of the acrylamide polymer or copolymer is in the range of about greater than about 0.2 to about 2.0, at a temperature and for a period of time sufficient to produce the gel composition.

16 . The method of claim 15 , wherein the pH is in the range of about 9.0 to about 11.

17 . The method of claim 15 , wherein the molar ratio of dialdehyde to monomers of the acrylamide polymer or copolymer is in the range of about greater than about 1.0 to about 2.0.

18 . The method of claim 15 , wherein the dialdehyde is selected from the group consisting of glyoxal, malondialdehyde, succindialdehyde, glutaraldehyde, adipaldehyde, o-phthaldehyde, m-phthaldehyde, p-phthaldehyde, and mixtures thereof.

19 . A method of treating a wellbore comprising injecting the gel composition of claim 1 into a wellbore.

20 . A method of treating a wellbore comprising injecting a composition comprising an acrylamide polymer or copolymer into a wellbore; injecting a composition comprising dialdehyde into the wellbore, and injecting a pH modifying agent into the wellbore in an amount sufficient to produce a downhole solution pH in the range of about 7.5 to about 11, to produce an in-situ gel composition comprising an acrylamide polymer or copolymer crosslinked with dialdehyde.

21 . The method of claim 20 , wherein the pH is in the range of about 9.0 to about 11.

22 . The method of claim 20 , wherein the dialdehyde wherein the dialdehyde is selected from the group consisting of glyoxal, malondialdehyde, succindialdehyde, glutaraldehyde, adipaldehyde, o-phthaldehyde, m-phthaldehyde, p-phthaldehyde, and mixtures thereof.

23 . The method of claim 20 , wherein the acrylamide polymer or copolymer has a charge between about 15 to about 35%.

24 . The method of claim 20 , wherein the acrylamide polymer or copolymer has a charge of between about 15 and 20%.

Assignees

• Li Jiang
• Tellakula Roopa
• Kemira Oyj

Inventors

• Li Jiang
• Tellakula Roopa

Classifications

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/887

  containing cross-linking agents · CPC title

• C09K8/88

  macromolecular compounds · CPC title

• C09K8/805

  Coated proppants · CPC title

• C09K8/685

  containing cross-linking agents · CPC title