US5382371A — Polymers useful in the recovery and processing of…

Claim 1

Independent Claim 66 words

A process comprising introducing a fluid comprised of a polymer produced from a monomer mixture comprising at least one N-vinyl lactam and at least one unsaturated amide and a solvent consisting essentially of water into a subterranean well bore wherein said polymer is exposed to a hostile environment at a temperature of at least about 120° F. and wherein said introducing is part of completion operations.

Claim 2

Dependent Claim 66 words

A process comprising introducing a fluid comprised of a polymer produced from a monomer mixture comprising at least one N-vinyl lactam and at least one unsaturated amide and a solvent consisting essentially of water into a subterranean well bore wherein said polymer is exposed to a hostile environment at a temperature of at least about 120° F. and wherein said introducing is part of completion operations.

Claim 3

Dependent Claim 21 words

A process in accordance with claim 1 wherein said polymer is exposed to a temperature of at least about 150 F.

Claim 4

Dependent Claim 107 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR18## where R" is an unsaturated radical and ##STR19## where each R' is individually selected from H or methyl, and at least one hydrophilic vinyl-containing sulfonic acid or the salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F. and wherein said forming and part of completion operations.

Claim 5

Dependent Claim 107 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR18## where R" is an unsaturated radical and ##STR19## where each R' is individually selected from H or methyl, and at least one hydrophilic vinyl-containing sulfonic acid or the salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F. and wherein said forming and part of completion operations.

Claim 6

Dependent Claim 69 words

A process in accordance with claim 1 wherein said N-vinyl lactam has the formula ##STR20## where R and R 1 are selected independently from the group consisting of hydrogen, methyl and ethyl and n is an integer of from 1 to 3, and said unsaturated amide has the formula ##STR21## where R" is selected from the group consisting of ethenyl (vinyl), isopropenyl, 1-butenyl, 2-butenyl, isobutenyl, 1-isopentenyl, 1-pentenyl, and 1-methyl-1-butenyl.

Claim 7

Dependent Claim 32 words

A process in accordance with claim 1 wherein said polymer is exposed to an aqueous fluid containing dissolved electrolytes and a salinity of at least about 10 grams per kilogram of solution.

Claim 8

Dependent Claim 31 words

A process in accordance with claim 5 wherein the dissolved electrolytes in said aqueous fluid contain a fraction of multivalent cations to total cations of at least about 1 weight percent.

Claim 9

Dependent Claim 15 words

A process in accordance with claim 5 wherein said aqueous fluid is subterranean formation water.

Claim 10

Dependent Claim 31 words

A process in accordance with claim 5 wherein the dissolved electrolytes in said aqueous fluid contain a fraction of multivalent cations to total cations of at least about 5 weight percent.

Claim 11

Dependent Claim 19 words

A process in accordance with claim 1 wherein said N-vinyl lactam is N-vinyl-2-pyrrolidone and said unsaturated amide is acrylamide.

Claim 12

Dependent Claim 35 words

A process in accordance with claim 1 wherein said polymer is produced from a monomer mixture comprising from about 10 to about 90 weight percent of said N-vinyl lactam, the remainder being said unsaturated amide.

Claim 13

Dependent Claim 35 words

A process in accordance with claim 1 wherein said polymer is produced from a monomer mixture comprising from about 25 to about 75 weight percent of said N-vinyl lactam, the remainder being said unsaturated amide.

Claim 14

Dependent Claim 35 words

A process in accordance with claim 1 wherein said polymer is produced from a monomer mixture comprising from about 40 to about 70 weight percent of said N-vinyl lactam, the remainder being said unsaturated amide.

Claim 15

Dependent Claim 35 words

A process in accordance with claim 1 wherein said polymer is produced from a monomer mixture comprising from about 50 to about 65 weight percent of said N-vinyl lactam, the remainder being said unsaturated amide.

Claim 16

Dependent Claim 63 words

A process in accordance with claim 1 wherein prior to introduction of said polymer into said subterranean well bore said polymer is heated to a temperature of at least about 120 F. and/or contacted with a base, an acid, a polyacid or a polyelectrolyte for a period of time sufficient to produce an equilibrium degree of hydrolysis and an equilibrium cloud point temperature.

Claim 17

Dependent Claim 27 words

A process in accordance with claim 14 wherein said polymer is heated to a temperature of at least about 250 F. for at least about 7 days.

Claim 18

Dependent Claim 28 words

A process in accordance with claim 1 wherein said monomer mixture comprises 10 weight percent or less, based on total weight of monomers, of at least one termonomer.

Claim 19

Dependent Claim 34 words

A process in accordance with claim 16 wherein said at least one termonomer is selected from the group consisting of hydrophobic compounds, vinyl pyridines and hyroxyalkyl esters of ethylenically-unsaturated carboxylic acids, and ethylenically-unsaturated nitriles.

Claim 20

Dependent Claim 68 words

A process in accordance with claim 17 wherein said at least one termonomer is selected from the group consisting of monovinyl aromatic hydrocarbons having from 8 to about 12 carbon atoms, vinyl esters of saturated carboxylic acids having from 3 to about 6 total carbon atoms, alkyl and hydroxyalkyl esters of ethylenically-unsaturated carboxylic acids having from 4 to about 22 total carbon atoms, vinyl pyridines, and ethylenically-unsaturated nitriles.

Claim 21

Dependent Claim 40 words

A process in accordance with claim 18 wherein said at least one termonomer is selected from the group consisting of methyl acrylate, butyl acrylate, methyl methacrylate, lauryl methacrylate, acrylonitrile, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethylacrylate, vinyl pyridines, vinyl acetate and styrene.

Claim 22

Dependent Claim 24 words

A process in accordance with claim 1 wherein said process additionally comprises circulating said fluid in a well-bore during the completion of a well.

Claim 23

Dependent Claim 68 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and a solvent consisting essentially of water and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 24

Dependent Claim 68 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and a solvent consisting essentially of water and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 25

Dependent Claim 13 words

A process according to claim 21 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone.

Claim 26

Dependent Claim 74 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic open-chain N-vinyl amide and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 27

Dependent Claim 74 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic open-chain N-vinyl amide and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 28

Dependent Claim 14 words

A process according to claim 23 wherein said hydrophilic open-chain N-vinyl amide is N-methyl-N-vinylacetamide.

Claim 29

Dependent Claim 84 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic open-chain N-vinyl amide and a solvent consisting essentially of water, and placing said fluid in a bore hole of a well wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 30

Dependent Claim 84 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic open-chain N-vinyl amide and a solvent consisting essentially of water, and placing said fluid in a bore hole of a well wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 31

Dependent Claim 21 words

A process according to claim 25 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone and said hydrophilic open-chain N-vinyl amide is N-methyl-N-vinylacetamide.

Claim 32

Dependent Claim 110 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR22## where R" is an unsaturated radical and ##STR23## where each R' is individually selected from H or methyl and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 33

Dependent Claim 110 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR22## where R" is an unsaturated radical and ##STR23## where each R' is individually selected from H or methyl and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 34

Dependent Claim 22 words

A process according to claim 27 wherein said hydrophilic unsaturated amide is selected from the group consisting of acrylamide, N-methylacrylamide, and N,N-dimethylacrylamide.

Claim 35

Dependent Claim 20 words

A process according to claim 27 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone and said hydrophilic unsaturated amide is acrylamide.

Claim 36

Dependent Claim 126 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR24## where R" is an unsaturated radical and ##STR25## where each R' is individually selected from H or methyl, and at least one termonomer selected from the group consisting of hydrophobic compounds, vinyl pyridines and hydroxyalkyl esters of ethylenically-unsaturated carboxylic acids and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 37

Dependent Claim 126 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR24## where R" is an unsaturated radical and ##STR25## where each R' is individually selected from H or methyl, and at least one termonomer selected from the group consisting of hydrophobic compounds, vinyl pyridines and hydroxyalkyl esters of ethylenically-unsaturated carboxylic acids and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 38

Dependent Claim 243 words

A process comprising forming a completion fluid comprising a water-soluble polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl amide, at least one hydrophilic component of the formula ##STR26## R is methyl, ethyl or H, provided further that at least one of the R groups on the terminal carbon of the vinyl group is H and the other is H or methyl, M is H, Na + , K + , Li + , R"" 4 N + , Ca ++ , Mg ++ , Zn ++ , Sr ++ , Fe ++ , Mn ++ , or + NH 3 R 1 NH 3 + where R 1 is a 1-20 carbon atom multivalent hydrocarbon radical, R"" is H, --ROH or a 1-3 carbon atom alkyl group; wherein X is selected from ##STR27## where n is an integer of 1-5, and R"' is a 1-3 carbon atom alkyl group or H, and at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR28## where R" is an unsaturated radical and ##STR29## where each R' is individually selected from H or methyl and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 39

Dependent Claim 243 words

A process comprising forming a completion fluid comprising a water-soluble polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl amide, at least one hydrophilic component of the formula ##STR26## R is methyl, ethyl or H, provided further that at least one of the R groups on the terminal carbon of the vinyl group is H and the other is H or methyl, M is H, Na + , K + , Li + , R"" 4 N + , Ca ++ , Mg ++ , Zn ++ , Sr ++ , Fe ++ , Mn ++ , or + NH 3 R 1 NH 3 + where R 1 is a 1-20 carbon atom multivalent hydrocarbon radical, R"" is H, --ROH or a 1-3 carbon atom alkyl group; wherein X is selected from ##STR27## where n is an integer of 1-5, and R"' is a 1-3 carbon atom alkyl group or H, and at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR28## where R" is an unsaturated radical and ##STR29## where each R' is individually selected from H or methyl and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature and multivalent ion concentration above the infinite days line of FIG. 14 and wherein said forming and placing are part of completion operations.

Claim 40

Dependent Claim 80 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic vinyl-containing sulfonic acid or the sulfonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F. and wherein said forming and placing are part of completion operations.

Claim 41

Dependent Claim 80 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic vinyl-containing sulfonic acid or the sulfonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F. and wherein said forming and placing are part of completion operations.

Claim 42

Dependent Claim 34 words

A process according to claim 32 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 43

Dependent Claim 23 words

A process according to claim 33, wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone and said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 44

Dependent Claim 28 words

A process according to claim 32 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 45

Dependent Claim 23 words

A process according to claim 35 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone and said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 46

Dependent Claim 115 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic vinyl-containing sulfonic acid or sulfonate salts thereof, and at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR30## where R" is an unsaturated radical and ##STR31## where each R' is individually selected from H or methyl and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F. and wherein said forming and placing are part of completion operations.

Claim 47

Dependent Claim 115 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic vinyl-containing sulfonic acid or sulfonate salts thereof, and at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR30## where R" is an unsaturated radical and ##STR31## where each R' is individually selected from H or methyl and a solvent consisting essentially of water, and placing said fluid in a bore hole wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F. and wherein said forming and placing are part of completion operations.

Claim 48

Dependent Claim 34 words

A process according to claim 37 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 49

Dependent Claim 29 words

A process according to claim 38 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said hydrophilic unsaturated amide is acrylamide and said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 50

Dependent Claim 28 words

A process according to claim 37 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 51

Dependent Claim 29 words

A process according to claim 40 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said hydrophilic unsaturated amide is acrylamide and said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 52

Dependent Claim 75 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic vinyl-containing phosphonic acid or the phosphonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 53

Dependent Claim 75 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam and at least one hydrophilic vinyl-containing phosphonic acid or the phosphonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 54

Dependent Claim 34 words

A process according to claim 42 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 55

Dependent Claim 23 words

A process according to claim 43, wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone and said hydrophilic vinyl-containing phosphonic acid is 2-acrylamido-2-methylpropane phosphonic acid.

Claim 56

Dependent Claim 28 words

A process according to claim 42 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 57

Dependent Claim 23 words

A process according to claim 45 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone and said hydrophilic vinyl-containing phosphonic acid is 2-acrylamido-2-methylpropane phosphonic acid.

Claim 58

Dependent Claim 111 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR32## where R" is an unsaturated radical and ##STR33## where each R' is individually selected from H or methyl, and at least one hydrophilic vinyl-containing phosphonic acid or the phosphonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 59

Dependent Claim 111 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR32## where R" is an unsaturated radical and ##STR33## where each R' is individually selected from H or methyl, and at least one hydrophilic vinyl-containing phosphonic acid or the phosphonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 60

Dependent Claim 34 words

A process according to claim 47 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 61

Dependent Claim 29 words

A process according to claim 48 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said hydrophilic unsaturated amide is acrylamide and said hydrophilic vinyl-containing phosphoric acid is 2-acrylamido-2-methylpropane phosphoric acid.

Claim 62

Dependent Claim 28 words

A process according to claim 47 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 63

Dependent Claim 29 words

A process according to claim 50 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said hydrophilic unsaturated amide is acrylamide and said hydrophilic vinyl-containing phosphonic acid is 2-acrylamido-2-methylpropane phosphonic acid.

Claim 64

Dependent Claim 122 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR34## where R" is an unsaturated radical and ##STR35## where each R' is individually selected from H or methyl, at least one hydrophilic vinyl-containing phosphonic acid or the salts thereof, and at least one hydrophilic vinyl-containing sulfonic acid or the sulfonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 65

Dependent Claim 122 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR34## where R" is an unsaturated radical and ##STR35## where each R' is individually selected from H or methyl, at least one hydrophilic vinyl-containing phosphonic acid or the salts thereof, and at least one hydrophilic vinyl-containing sulfonic acid or the sulfonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 66

Dependent Claim 34 words

A process according to claim 52 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 67

Dependent Claim 37 words

A process according to claim 53 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said hydrophilic unsaturated amide is acrylamide, said hydrophilic vinyl-containing phosphonic acid is 2-acrylamido-2-methylpropanephosphonic acid, and said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 68

Dependent Claim 28 words

A process according to claim 52 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 69

Dependent Claim 37 words

A process according to claim 55 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said hydrophilic unsaturated amide is acrylamide, said hydrophilic vinyl-containing phosphonic acid is 2-acrylamido-2-methylpropanephosphonic acid, and said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 70

Dependent Claim 121 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one α-,β-unsaturated carboxylic acid or the salts thereof, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR36## where R" is an unsaturated radical and ##STR37## where each R' is individually selected from H or methyl, and at least one hydrophilic vinyl-containing sulfonic acid or the sulfonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 71

Dependent Claim 121 words

A process comprising forming a completion fluid comprising a polymer produced from a monomer composition consisting essentially of at least one hydrophilic N-vinyl lactam, at least one α-,β-unsaturated carboxylic acid or the salts thereof, at least one hydrophilic unsaturated amide selected from the group consisting of monomers represented by the formulas, ##STR36## where R" is an unsaturated radical and ##STR37## where each R' is individually selected from H or methyl, and at least one hydrophilic vinyl-containing sulfonic acid or the sulfonate salts thereof and a solvent consisting essentially of water, and placing said fluid in a bore hole during the completion of a well wherein said fluid encounters hostile conditions as defined by a temperature of at least about 120° F.

Claim 72

Dependent Claim 34 words

A process according to claim 57 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 73

Dependent Claim 36 words

A process according to claim 58 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said α-,β-unsaturated carboxylic acid is acrylic acid, said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid and said hydrophilic unsaturated amide is acrylamide.

Claim 74

Dependent Claim 28 words

A process according to claim 57 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 75

Dependent Claim 36 words

A process according to claim 60 wherein said hydrophilic N-vinyl lactam is N-vinyl-2-pyrrolidone, said α-,β-unsaturated carboxylic acid is acrylic acid, said hydrophilic vinyl-containing sulfonic acid is 2-acrylamido-2-methylpropane sulfonic acid and said hydrophilic unsaturated amide is acrylamide.

Claim 76

Dependent Claim 28 words

A process according to claim 3 wherein said hostile conditions are defined to be a temperature and multivalent ion concentration above the infinite days line of FIG. 14.

Claim 77

Dependent Claim 34 words

A process according to claim 3 wherein said hostile conditions are defined to be a temperature of at least about 120° F. and a salinity of at least about 10 grams per kilogram solution.

Claim 78

Dependent Claim 22 words

A process according to claim 63 wherein said hydrophilic unsaturated amide is acrylamide and said vinyl-containing sulfonate acid is 2-acrylamido-2-methylpropane sulfonic acid.

Claim 79

Dependent Claim 22 words

A process according to claim 62 wherein said hydrophilic unsaturated amide is acrylamide and said vinyl-containing sulfonate acid is 2-acrylamido-2-methylpropane sulfonic acid.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-01-16	1998-07-18	1999-01-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-01-16	2002-07-18	2003-01-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-01-16	2006-07-18	2007-01-17	$7700.00	Window Closed / Lapsed

Polymers useful in the recovery and processing of natural resources

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