Low molecular weight polyacrylates for EOR
AssigneesUniversity of Kansas, ConocoPhillips Company
InventorsStephen J Johnson, Cory Berkland, Ahmad Moradi-Araghi, Jenn-Tai Liang, Terry M. Christian, Riley B. Needham, Min Cheng, Ying-Ying Lin, Andrew B. Woodside
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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.
Claims18
A composition comprising a polyelectrolyte complex nanoparticle having a polyalkylenimine and a polyanion, said nanoparticle having a size of less than one micron, wherein said polyanion is equal to or less than 10,000 Da, wherein said polyelectrolyte complex nanoparticle is mixed with a multivalent cation crosslinker.
A composition comprising:
- i. a delayed gelling agent comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine of less than 26,000 Da and a sodium, ammonium or potassium polyvinyl sulfonate equal to or less than 10,000 Da intimately associated with at least one multivalent cation crosslinker, said nanoparticle having a size of less than one micron,
- ii. a polymer having anionic sites that can be crosslinked with said at least one multivalent cation crosslinker, and
- iii. a fluid.
A composition comprising:
- i. a delayed gelling agent comprising a polyelectrolyte complex nanoparticle comprising a polyethylenimine of less than 26,000 Da and an ammonium polyacrylate, sodium polyacrylate or potassium polyacrylate of equal to or less than 10,000 Da intimately associated with at least one multivalent cation crosslinker, wherein said multivalent cation crosslinker is Cr(III), Fe(III), or complexes of same, said nanoparticle having a size of less than one micron,
- ii. a partially hydrolyzed polyacrylamide polymer having anionic sites that can be crosslinked with said at least one multivalent cation crosslinker, and
- iii. a fluid.
Dependencies are inferred from the claim text.