Nanogels for delayed gelation

Patent metadata

Field	Value
Publication number	US-2018002592-A1
Application number	US-201715708034-A
Country	US
Kind code	A1
Filing date	Sep 18, 2017
Priority date	Jan 18, 2013
Publication date	Jan 4, 2018
Grant date	—

Abstract

The instant application relates to nanogels or compositions that hold multivalent metal ions until some level of nanogel degradation has occurred, then slowly release the multivalent metal ions for gelation with carboxylate containing polymers. Compositions comprising such nanogels, together with polymers that can be crosslinked with multivalent metal ions, allow the deployment of such mixtures in various applications, and greatly increased gelation times.

First claim

1 ) A degradable composition comprising a polymer having releasable carboxylate groups bound to with a multivalent metal ion, said degradable composition lasting at least 5 days at 85° C. in a brine solution having 23 g/l NaCl, and thereafter degrading and releasing said multivalent metal ion, wherein said composition is in the form of a nanogel.

2 ) The composition of claim 1 , wherein said nanogel has an average particle size of less than one micron.

3 ) The composition of claim 1 , wherein said nanogel has an average particle size of 200-600 nm.

4 ) The composition of claim 1 , wherein said nanogel has an average particle size of 400 nm.

5 ) The composition of claim 1 , wherein said polymer is made from monomers selected from the group of vinyl, allyl, styrene, and acrylamide monomers and their derivatives, conjugated with a dicarboxylate or tricarboxylate.

6 ) The composition of claim 5 , wherein said dicarboxylate or tricarboxylate is citrate, succinate, aspartate, glutamate, malate, oxalate, malonate, glutarate, adipate, or pimelate, or a derivative thereof.

7 ) The composition of claim 1 , wherein said polymer is carboxylated polysaccharide, carboxylated guar, or carboxymethyl cellulose.

8 ) The composition of claim 1 , wherein said polymer having releasable carboxylate groups is a polymer or copolymer of succinate, aspartate, malate, oxalate, malonate, glutarate, adipate, or pimelate, carbonate or a derivative thereof.

9 ) The composition of claim 1 , wherein said composition comprises polyvinyl alcohol (PVA) succinate, N-hydroxylmethyl acrylamide (NHMA) succinate, allyl alcohol succinate and allylamine succinate, PVA malate, NHMA malate, allyl alcohol malate or allylamine malate.

10 ) The composition of claim 1 , wherein said multivalent metal ion is chromium, zirconium, iron, aluminum, and titanium.

11 ) The composition of claim 1 , comprising PVA succinate and chromium or zirconium.

12 ) The composition of claim 1 , comprising PVA malate and chromium or zirconium.

13 ) The composition of claim 1 , comprising polyaspartate and chromium or zirconium.

14 ) The composition of claim 1 , comprising polyglutamate and chromium or zirconium.

15 ) The composition of claim 1 , wherein a carboxylate group to multivalent metal ion molar ratio is from 3:1 to 15:1.

16 ) The composition of claim 1 , wherein the multivalent metal ion is present at 50-5000 ppm.

17 ) A degradable composition comprising polyvinyl alcohol (PVA) succinate or PVA malate complexed with multivalent metal ion comprising chromium, zirconium, iron, aluminum, titanium or combinations thereof, said degradable composition lasting at least 5 days at 85° C. in a brine solution having 23 g/l NaCl, and thereafter degrading and releasing said multivalent metal ion.

18 ) A degradable composition comprising polyasparate or polyglutamate complexed with multivalent metal ion comprising chromium, zirconium, iron, aluminum, titanium or combinations thereof, said degradable composition lasting at least 20 days at 88° C. in a brine solution having 23 g/l NaCl, and thereafter degrading and releasing said multivalent metal ion.

19 ) A degradable composition comprising polyvinyl alcohol (PVA) succinate or PVA malate or polyasparate complexed with multivalent metal ion comprising chromium, zirconium, iron, aluminum, titanium or combinations thereof, said degradable composition lasting at least 30 days at 65° C. in a brine solution having 23 g/l NaCl, and thereafter degrading said nanogel and releasing said multivalent metal ion.

20 ) A degradable composition comprising polyvinyl alcohol (PVA) succinate or PVA malate complexed with multivalent metal ion comprising chromium, zirconium, iron, aluminum, titanium or combinations thereof.

21 ) A degradable composition comprising polyasparate or polyglutamate complexed with multivalent metal ion comprising chromium, zirconium, iron, aluminum, titanium or combinations thereof.

22 ) A degradable composition comprising polyvinyl alcohol (PVA) succinate or PVA malate or polyasparate complexed with multivalent metal ion comprising chromium, zirconium, iron, aluminum, titanium or combinations thereof.

23 ) A delayed gelling composition comprising the composition of claims 1 admixed with an injection fluid admixed with a carboxylate containing polymer.

24 ) The delayed gelling composition of claim 22 , said carboxylate containing polymer comprising partially hydrolyzed polyacrylamide, copolymers of N-vinyl-2-pyrrolidone and sodium acrylate, tetrapolymers of sodium-2-acrylamido-2-methylpropanesulfonate, acrylamide and N-vinyl-2-pyrrolidone and sodium acrylate; and copolymers of sodium-2-acrylamido-2-methylpropanesulfonate and sodium acrylate; carboxylated polysaccharide; carboxymethylcellulose; carboxylated guar; and combinations thereof.

25 ) An improved method of sweeping for oil or gas, said method requiring blocking thief zones with a polymer, and sweeping a reservoir for oil or gas, the improvement comprising injecting the composition of claim 23 into a reservoir, aging said composition until the viscosity increases, and sweeping the reservoir for oil or gas.

26 ) An improved method of producing oil or gas, said method requiring injecting a polymer into a reservoir and producing an oil or gas, the improvement comprising injecting the composition of claim 23 into a reservoir, aging said composition until the viscosity increases, and producing said oil or gas.

Assignees

• Conocophillips Co
• Univ Kansas

Inventors

• Guan Huili
• Berkland Cory
• Moradi-Araghi Ahmad
• Liang Jenn-Tai
• Christian Terry M
• Needham Riley B
• Cheng Min
• Scully Faye Lynn
• Hedges James H

Classifications

• C08L5/00

  Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00 · CPC title

• C09K8/588 Primary

  characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} · CPC title

• C08L1/286

  substituted with acid radicals, e.g. carboxymethyl cellulose [CMC] (C08L1/282 takes precedence) · CPC title