Low molecular weight polyacrylates for eor

Patent metadata

Field	Value
Publication number	US-2016115371-A1
Application number	US-201614989350-A
Country	US
Kind code	A1
Filing date	Jan 6, 2016
Priority date	Jan 28, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

The disclosure is directed to low molecular weight polyelectrolyte complex nanoparticles that can be used to deliver agents deep into hydrocarbon reservoirs. Methods of making and using said polyelectrolyte complex nanoparticles are also provided.

First claim

1 ) A composition comprising a polyelectrolyte complex nanoparticle having a polyalkylenimine and a polyanion, said nanoparticle having a size of less than one micron.

2 ) The composition of claim 1 ), said polyelectrolyte complex nanoparticle intimately associated with a multivalent cation crosslinker.

3 ) The composition of claim 1 ), wherein said polyalkylenimine is polyethylenimine.

4 ) The composition of claim 1 ), wherein said polyanion is less than 10,000 Da.

5 ) The composition of claim 1 ), wherein said polyalkylenimine is less than 26,000 Da.

6 ) The composition of claim 1 ), wherein said polyanion is selected from ammonium, sodiated or potassiated polyacrylate, polyvinyl sulfonate, poly(styrene sulfonate), copolymers of acrylate with acrylamide, vinylsulfonate or styrene sulfonate, dextran sulfate, and anionic surfactants.

7 ) The composition of claim 6 ), wherein said anionic surfactant is selected from the group consisting of sodium dodecyl sulfate, sodium lauryl sulfate, alcohol propoxy sulfate, olefin sulfonates, and alpha olefin sulfonates.

8 ) The composition of claim 1 ), wherein said polyanion is sodium polyacrylate, potassium polyacrylate, or ammonium polyacrylate.

9 ) The composition of claim 2 ), wherein said multivalent cation crosslinker is a compound selected from the group consisting of zirconium acetate, sodium zirconium lactate, zirconium sulfate, zirconium tetrachloride, zirconium orthosulfate, zirconium oxychloride, zirconium carbonate, zirconium ammonium carbonate, zirconium acetylacetonate, chromium acetate, chromium propinonate, chromium malonate, chromium malate, chromium chloride, aluminum chloride, aluminum sulfate, aluminum citrate, tin chloride, tin sulfate, iron (III) chloride, iron (III) nitrate, iron (III) sulfate, iron (III) acetate, iron (III) citrate, titanium chloride, and titanium sulfate.

10 ) The composition of claim 1 ), further comprising monovalent or divalent cations selected from the group consisting of sodium, potassium, magnesium or calcium ions.

11 ) The composition of claim 1 ), wherein said polyelectrolyte complex comprised a nanoparticle with an average particle size of about 100 to 500 nm in diameter.

12 ) The composition of claim 1 ), wherein said polyelectrolyte complex nanoparticles are stable in water, field brine and seawater.

13 ) A composition comprising a polyelectrolyte complex nanoparticle comprising a polyalkylenimine and ammonium polyacrylate, sodium polyacrylate or potassium polyacrylate, said polyelectrolyte complex nanoparticle having a size of less than one micron.

14 ) The composition of claim 13 ), said polyalkylenimine being less than 26,000 Da.

15 ) The composition of claim 13 ), said polyanion being less than 10,000 Da.

16 ) The composition of claim 13 ), said nanoparticle entrapping a multivalent cation.

17 ) The composition of claim 16 ), said multivalent cation comprising Zr(IV), Cr(III), Ti(IV), Fe(III) or Al(III).

18 ) A composition comprising a polyelectrolyte complex nanoparticle for delivery of an oil and gas chemical to a reservoir, said composition comprising a polyethylenimine of less than 26,000 Da and a polyanion of less than 10,000 Da intimately associated with an oil and gas field chemical to form a polyelectrolyte complex, said complex having an average particle size of less than one micron.

19 ) A composition for controlled release of an oil and gas field chemical comprising:
a) a polyanion of less than 10,000 Da and a polyethylenimine of less than 26,000 Da forming a polyelectrolyte complex; b) said polyelectrolyte complex intimately associated with an oil and gas chemical selected from the group consisting of a (a) a gel-forming or cross-linking agent, (b) a scale inhibitor, (c) a corrosion inhibitor, (d) an inhibitor of asphaltene or wax deposition, (e) a hydrogen sulfide scavenger, (f) a hydrate inhibitor, (g) a gel breaking agent, and (h) a surfactant; and c) said polyelectrolyte complex having an average particle size less than 1000 nm.

20 ) The composition of claim 19 ), said polyanion comprising sodium polyacrylate, ammonium polyacrylate, or potassium polyacrylate.

21 ) A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 26,000 Da and a sodium polyacrylate of less than 10,000 Da intimately associated with a chromium ion crosslinker, said nanoparticle having a size of less than one micron, wherein said nanoparticle has a predominance of negative charges and the amount of sodium polyacrylate exceeds the amount of PEI.

22 ) A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 26,000 Da and sodium polyacrylate of less than 10,000 Da intimately associated with a chromium or Fe(III) ion crosslinker, said nanoparticle having a size of less than one micron, wherein said nanoparticle has a predominance of positive charges and the amount of PEI exceeds the amount of sodium polyacrylate.

23 ) A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 26,000 Da and potassium polyacrylate of less than 10,000 Da intimately associated with a chromium or Fe(III) ion crosslinker, said nanoparticle having a size of less than one micron, wherein said nanoparticle has a predominance of positive charges and the amount of PEI exceeds the amount of potassium polyacrylate.

24 ) A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 26,000 Da and a polyanion of less than 10,000 Da intimately associated with at least one multivalent cation crosslinker, wherein said polyanion is selected from ammoniated, sodiated or postassiated polyacrylate, polyvinyl sulfonate, poly(sodium styrene sulfonate), copolymers of acrylate with acrylamide, vinylsulfonate or styrene sulfonate, dextran sulfate, and anionic surfactants, and where the at least one multivalent cation crosslinker is selected from aluminum, iron(III), titanium, chromium, zirconium and complexes of same.

25 ) A delayed gelling composition comprising:
a) a delayed gelling agent comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine of less than 26,000 Da and a ammonium polyacrylate, sodium polyacrylate or potassium polyacrylate of less than 10,000 Da intimately associated with at least one multivalent cation crosslinker, said nanoparticle having a size of less than one micron; b) a polymer having anionic sites that can be crosslinked with said at least one multivalent cation crosslinker; and c) a fluid.

26 ) A delayed gelling composition comprising:
a) a composition of claim 1 ; b) a polymer that can be crosslinked with a); and c) a fluid.

27 ) The composition of claim 25 ), where said polymer is an acrylate-based polymer.

28 ) The composition of claim 25 ), where said polymer is partially hydrolyzed polyacrylamide.

29 ) The composition of claim 25 ), where said polymer is a polymer or copolymers of acrylate with acrylamide, N,N-dimethyacrylamide, tert-butyl acrylate, acryamido-2-methylpropane sulfonic acid, sodium 2-acryamido-2-methylpropane sulfonate, or N,N, dimethyl acrylamide.

30 ) The composition of claim 25 ), where said at least one multivalent cation crosslinker is chromium(III) or Fe(III).

Assignees

• Conocophillips Co
• Univ Kansas

Inventors

• Johnson Stephen J
• Berkland Cory
• Moradi-Araghi Ahmad
• Liang Jenn-Tai
• Christian Terry M
• Needham Riley B
• Cheng Min
• Lin Ying-Ying
• Woodside Andrew B

Classifications

• E21B43/16

  Enhanced recovery methods for obtaining hydrocarbons · CPC title

• C09K8/528

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C09K2208/22

  Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers · CPC title

• C09K8/524

  organic depositions, e.g. paraffins or asphaltenes · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title