Delayed gelling agents
AssigneesConocoPhillips Company, University of Kansas
InventorsYing-Ying Lin, Cory Berkland, Jenn-Tai Liang, Ahmad Moradi-Araghi, Terry M Christian, Riley B. Needham, James H. Hedges, Min Cheng, Faye L. Scully, David R. Zornes
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Abstract
The disclosure is directed to 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.
Claims24
A composition comprising a polyelectrolyte complex nanoparticle comprising a polyalkylenimine of less than 2000 Da and a polyanion, said nanoparticle having a size of less than one micron, and wherein said polyelectrolyte complex nanoparticle is intimately associated with a multivalent cation crosslinker.
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 2000 Da and a polyanion 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.
A composition for controlled release of an oil and gas field chemical comprising:
- a) a polyanion and a polyethylenimine of less than 2000 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 breaking agent, and (h) a surfactant;
- and
- c) said polyelectrolyte complex having an average particle size less than 1000 nm.
A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 2000 Da and polyvinyl sulfonate (PVS) intimately associated with a zirconium 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 PVS exceeds the amount of PEI.
A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 2000 Da and polyvinyl sulfonate (PVS) intimately associated with a zirconium 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 PVS.
A composition comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine (PEI) of less than 2000 Da and a polyanion intimately associated with a metal ion crosslinker, wherein said polyanion is selected from sodium polyvinyl sulfonate, poly (sodium acrylate) poly(sodium styrene sulfonate), copolymers of sodium acrylate with sodium vinylsulfonate or sodium styrene sulfonate, dextran sulfate, and anionic surfactants, and where the metal ion crosslinker is selected from aluminum, iron, titanium, chromium, zirconium and complexes of same.
A delayed gelling composition comprising:
- a) a delayed gelling agent comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine of less than 2000 Da and a polyvinyl sulfonate intimately associated with a metal cation crosslinker, said nanoparticle having a size of less than one micron;
- b) a polymer having anionic sites that can be crosslinked with said metal cation crosslinker;
- and
- c) a fluid.
Dependencies are inferred from the claim text.