Nanogels for delayed gelation
AssigneesConocoPhillips Company, University of Kansas
InventorsHuili GUAN, Cory BERKLAND, Ahmad MORADI-ARAGHI, Jenn-Tai LIANG, Terry M. CHRISTIAN, Riley B. NEEDHAM, Min CHENG, Faye Lynn SCULLY, James H. HEDGES
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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.
Claims26
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.
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.
Dependencies are inferred from the claim text.