Patent ID: 11879095
Assignee: KEMIRA OYJ
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 1:
2. The method of claim 1, comprising at least one of the following:
i. the oil or gas containing aqueous environment contains inorganic salts;
ii. the oil or gas containing aqueous environment comprises sea water or other salinated water;
iii. the oil or gas containing aqueous environment has a temperature ranging from 55° C. to 100° C.;
iv. said at least one polymer has an initial content of anionic monomers of less than 25 mole percent;
v. said at least one polymer comprises 1-100 mole percent of said labile monomer units which break or hydrolyze in the oil or gas containing aqueous environment;
vi. said at least one polymer comprises 1-100 mole percent of acrylamide monomers;
vii. the oil or gas containing aqueous environment comprises an oil or gas reservoir;
viii. said at least one polymer when introduced into said oil or gas containing aqueous environment provides for improved oil or gas recovery compared to a copolymer comprising 70 mol % acrylamide and 30 mol % acrylic acid, wherein said at least one polymer comprises an initial viscosity which is the same as the viscosity of said copolymer comprising 70 mol % acrylamide and 30 mol % acrylic acid;
ix. t said at least one polymer comprises a polymer that comprises acrylamide or acrylamide-type monomers;
x. said at least one polymer comprises a polymer comprising acrylic acid monomers;
xi. said at least one polymer comprises a polymer comprising acrylamide tertiary butyl sulfonic acid (“ATBS”) monomers;
xii. said at least one polymer comprises a polymer comprising acrylamide monomers and anionic monomers;
xiii. said at least one polymer comprises a polymer comprising acrylamide monomers and acrylic acid monomers;
xiv. said at least one polymer comprises a polymer comprising acrylamide monomers and ATBS monomers;
xv. said at least one polymer comprises a polymer comprising (meth)acrylamide or (meth)acrylamide-type monomers that are not anionically charged when introduced into the oil or gas containing aqueous environment;
xvi. said at least one polymer comprises a polymer comprising one or more (meth)acrylate monomers that are not anionically charged when introduced into the oil or gas containing aqueous environment;
xvii. said at least one polymer comprises a polymer that comprises one or more vinyl monomers;
xviii. said at least one polymer comprises a polymer comprising one or more monomers selected from the group consisting of:
acrylamide, N,N-dimethylacrylamide, N-hydroxymethylacrylamide, N-hydroxyethylacrylamide, N isopropylacrylamide, N-acryloylmorpholine, N-acryloyl pyrrolidine, methacrylamide, N,N-dimethylmethacrylamide, Methyl acrylate, hydroxyethyl acrylate, methyl methacrylate, hydroxyethyl methacrylate, and N-vinylcaprolactam;

xix. said at least one polymer comprises a polymer comprising 75-100 mol % of acrylamide monomers;
xx. said at least one polymer comprises a polymer comprising 0-25 mol % of acrylic acid monomers;
xxi. said at least one polymer comprises a polymer comprising sulfonated polyacrylamide monomers;
xxii. said at least one polymer comprises a polymer comprising one or more sulfonic acid monomers;
xxiii. said at least one polymer comprises a polymer comprising one or more sulfonic acid monomers selected from the group consisting of ATBS, vinylsulfonic acid, 4-styrenesulfonic acid, and salts of any of the aforementioned sulfonic acid monomers;
xxiv. said at least one polymer comprises a polymer comprising 0-25 mol % of ATBS monomers;
xxv. said at least one polymer comprises a polymer comprising 5 mol % acrylic acid monomers and 95 mol % acrylamide monomers;
xxvi. said at least one polymer comprises a polymer comprising 15 mol % ATBS monomers and 85 mol % acrylamide monomers;
xxvii. said at least one polymer comprises a polymer comprising 1-100 mol % of labile monomer units;
xxviii. said at least one polymer comprises a polymer that comprises 0-100 mol % of anionically charged monomers prior to introduction into the oil or gas containing aqueous environment;
xxix. said at least one polymer comprises a polymer which increases in viscosity by 1-45% after introduction into the oil or gas containing aqueous environment;
xxx. said at least one polymer comprises a polymer that increases in anionic charge by 1-100 mol % after introduction into the oil or gas containing aqueous environment;
xxxi. the aqueous solution or aqueous composition comprising said at least one polymer after introduction into the oil or gas containing aqueous environment retains at least 80% of its initial viscosity for a duration of 10-95 months;
xxxii. said at least one polymer is introduced into the oil or gas containing aqueous environment at a dose ranging from 100-10,000 ppm; or
xxxiii. any combination of the foregoing.