Claims
- 1. A method of treating a subterranean zone penetrated by a well bore comprising introducing into said subterranean zone an aqueous well treating fluid comprised of water and a water soluble polymer complex fluid loss control additive.
- 2. The method of claim 1 wherein said water soluble polymer complex fluid loss control additive is comprised of a cationic, anionic or amphoteric polymer formed in the presence of a nonionic host polymer.
- 3. The method of claim 2 wherein the weight ratio of said cationic, anionic or amphoteric polymer to said nonionic polymer is in the range of from about 1:10 to about 10:1.
- 4. The method of claim 2 wherein said nonionic polymer is a natural gum.
- 5. The method of claim 2 wherein said nonionic polymer is a hydroxyalkylated natural gum.
- 6. The method of claim 2 wherein said nonionic polymer is hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 7. The method of claim 2 wherein the monomer units forming said cationic, anionic or amphoteric polymer are comprised of monomer units derived from a sulfonic acid functional monomer.
- 8. The method of claim 2 wherein the monomer units forming said cationic, anionic or amphoteric polymer are comprised of 2-acrylamido-2-methyl propane sulfonic acid monomer units present in said polymer in an amount in the range of from about 25 mole % to about 75 mole %.
- 9. The method of claim 8 wherein the monomer units forming said cationic, anionic or amphoteric polymer are further comprised of N,N-dimethylacrylamide monomer units present in said polymer in an amount in the range of from about 10 mole % to about 40 mole %.
- 10. The method of claim 8 wherein the monomer units forming said cationic, anionic or amphoteric polymer are further comprised of acrylamide monomer units present in said polymer in an amount in the range of from about 10 mole % to about 30 mole %.
- 11. The method of claim 8 wherein the monomer units forming said cationic, anionic or amphoteric polymer are further comprised of acrylic acid monomer units present in said polymer in an amount in the range of from about 10 mole % to about 20 mole %.
- 12. The method of claim 8 wherein the monomer units forming said cationic, anionic or amphoteric polymer are further comprised of vinyl pyrrolidone monomer units present in said polymer in an amount in the range of from about 5 mole % to about 20 mole %.
- 13. The method of claim 1 wherein said water soluble polymer complex fluid loss control additive is comprised of 1 part by weight of a polymer comprised of 70 mole % of 2-acrylamido-2-methyl propane sulfonic acid, 17 mole % of N,N-dimethylacrylamide and 13 mole % of acrylamide and 2 parts by weight of a nonionic polymer comprised of hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 14. The method of claim 1 wherein said water soluble polymer complex fluid loss control additive is comprised of 1 part by weight of a polymer comprised of 40 mole % of 2-acrylamido-2-methyl propane sulfonic acid, 30 mole % of acrylamide, 20 mole % of acrylic acid and 10 mole % of vinyl pyrrolidone and 1 part by weight of a nonionic polymer comprised of hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 15. The method of claim 1 wherein said water soluble polymer complex fluid loss control additive is present in said aqueous well treating fluid in an amount in the range of from about 0.09% to about 2.5% by weight of water in said well treating fluid.
- 16. The method of claim 1 wherein said aqueous well treating fluid further comprises a hydraulic cement.
- 17. The method of claim 16 wherein said hydraulic cement is a Portland cement.
- 18. The method of claim 16 wherein said water is present in said aqueous well treating fluid in an amount in the range of from about 35% to about 50% by weight of cement in said treating fluid.
- 19. The method of claim 16 wherein said aqueous well treating fluid further comprises a gas in an amount sufficient to foam said aqueous well treating fluid and a mixture of foaming and foam stabilizing surfactants present in an effective amount.
- 20. The method of claim 19 wherein said gas is selected from the group of air and nitrogen.
- 21. The method of claim 19 wherein said gas is nitrogen.
- 22. The method of claim 19 wherein said mixture of foaming and foam stabilizing surfactants is comprised of an ethoxylated alcohol ether sulfate surfactant, an alkyl or alkene amidopropyl betaine surfactant and an alkyl or alkene amidopropyl dimethyl amine oxide surfactant.
- 23. The method of claim 19 wherein said mixture of foaming and foam stabilizing surfactants is present in said aqueous well treating fluid in an amount in the range of from about 0.8% to about 5% by volume of water in said treating fluid.
- 24. The method of claim 1 wherein said aqueous well treating fluid further comprises a gelling agent for increasing the viscosity of said fluid.
- 25. The method of claim 24 wherein said gelling agent is selected from the group consisting of guar gum, hydroxypropylguar, carboxymethylhydroxypropyl guar, hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, carboxymethylcellulose, hydroxyethylcellulose grafted with vinyl phosphonic acid, xanthan gum, welan gum and succinoglycon.
- 26. The method of claim 24 wherein said gelling agent is present in said aqueous well treating fluid in an amount in the range of from about 0.125% to about 1.5% by weight of water in said treating fluid.
- 27. The method of claim 24 wherein said aqueous well treating fluid further comprises a cross-linking agent for cross-linking said gelling agent.
- 28. The method of claim 27 wherein said cross-linking agent is selected from the group consisting of borate releasing compounds, a source of titanium ions, a source of zirconium ions, a source of antimony ions and a source of aluminum ions.
- 29. The method of claim 27 wherein said cross-linking agent is present in said aqueous well treating fluid in an amount in the range of from about 0.1% to about 2% by weight of said gelling agent in said treating fluid.
- 30. The method of claim 24 or 27 wherein said aqueous well treating fluid further comprises a delayed breaker present in an amount sufficient to effect a reduction in the viscosity of said treating fluid after said treating fluid has been in said subterranean zone for a period of time.
- 31. The method of claim 30 wherein said delayed breaker is selected from the group consisting of alkali metal and ammonium persulfates which are delayed by being encapsulated in a material which slowly releases said breaker or by a breaker selected from the group consisting of alkali metal chlorites, alkali metal hypochlorites and calcium hypochlorites.
- 32. A method of cementing a subterranean zone penetrated by a well bore comprising introducing into said subterranean zone a cement composition comprised of a hydraulic cement slurried with water and a water soluble polymer complex fluid loss control additive present in an amount in the range of from about 0.25% to about 5% by weight of cement in said composition.
- 33. The method of claim 32 wherein said water soluble polymer complex fluid loss control additive is comprised of an cationic, anionic or amphoteric polymer formed in the presence of a nonionic host polymer.
- 34. The method of claim 33 wherein the weight ratio of said cationic, anionic or amphoteric polymer to said nonionic host polymer is in the range of from about 1:10 to about 10:1.
- 35. The method of claim 33 wherein said nonionic polymer is a natural gum.
- 36. The method of claim 33 wherein said nonionic polymer is a hydroxyalkylated natural gum.
- 37. The method of claim 33 wherein said nonionic polymer is hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 38. The method of claim 33 wherein the monomer units forming said polymer are comprised of monomer units derived from a sulfonic acid functional monomer.
- 39. The method of claim 33 wherein the monomer units forming said polymer are comprised of 2-acrylamido-2-methyl propane sulfonic acid monomer units present in said polymer in an amount in the range of from about 25 mole % to about 75 mole %.
- 40. The method of claim 39 wherein the monomer units forming said polymer are further comprised of N,N-dimethylacrylamide monomer units present in said polymer in an amount in the range of from about 10 mole % to about 40 mole %.
- 41. The method of claim 39 wherein the monomer units forming said polymer are further comprised of acrylamide monomer units present in said polymer in an amount in the range of from about 10 mole % to about 30 mole %.
- 42. The method of claim 39 wherein the monomer units forming said cationic, anionic or amphoteric polymer are further comprised of acrylic acid monomer units present in said polymer in an amount in the range of from about 10 mole % to about 20 mole %.
- 43. The method of claim 39 wherein the monomer units forming said polymer are further comprised of vinyl pyrrolidone monomer units present in said polymer in an amount in the range of from about 5 mole % to about 20 mole %.
- 44. The method of claim 32 wherein said water soluble polymer complex fluid loss control additive is comprised of 1 part by weight of a polymer comprised of 70 mole % of 2-acrylamido-2-methyl propane sulfonic acid, 17 mole % of N,N-dimethylacrylamide and 13 mole % of acrylamide and 2 parts by weight of a nonionic polymer comprised of hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 45. The method of claim 32 wherein said water soluble polymer complex fluid loss control additive is comprised of 1 part by weight of a polymer comprised of 40 mole % of 2-acrylamido-2-methyl propane sulfonic acid, 30 mole % of acrylamide, 20 mole % of acrylic acid and 10 mole % of vinyl pyrrolidone and 1 part by weight of a nonionic polymer comprised of hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 46. The method of claim 32 wherein said water is present in said cement composition in an amount in the range of from about 35% to about 50% by weight of cement in said cement composition.
- 47. The method of claim 32 wherein said cement composition further comprises a dispersant selected from the group consisting of naphthalene sulfonic acid condensed with formaldehyde and the condensation reaction product of acetone, formaldehyde and sodium bisulfite present in an amount in the range of from about 0.5% to 2% by weight of cement in said composition.
- 48. The method of claim 32 wherein said cement composition further comprises a gas in an amount sufficient to foam said cement composition and a mixture of foaming and foam stabilizing surfactants present in an effective amount.
- 49. The method of claim 48 wherein said gas is selected from the group of air and nitrogen.
- 50. The method of claim 48 wherein said gas is nitrogen.
- 51. The method of claim 48 wherein said mixture of foaming and foam stabilizing surfactants is comprised of an ethoxylated alcohol ether sulfate surfactant, an alkyl or alkene amidopropyl betaine surfactant and an alkyl or alkene amidopropyl dimethyl amine oxide surfactant.
- 52. The method of claim 48 wherein said mixture of foaming and foam stabilizing surfactants is present in said cement composition in an amount in the range of from about 0.8% to about 5% by volume of water in said treating fluid.
- 53. A method of treating a subterranean zone penetrated by a well bore comprising introducing into said subterranean zone an aqueous well treating fluid comprised of water, a gelling agent present in an amount in the range of from about 0.125% to about 1.5% by weight of water in said aqueous well treating fluid and a water soluble polymer complex fluid loss control additive present in an amount in the range of from about 0.1% to about 5% by weight of water in said aqueous well treating fluid.
- 54. The method of claim 53 wherein said water soluble polymer complex fluid loss control additive is comprised of an cationic, anionic or amphoteric polymer formed in the presence of a nonionic host polymer.
- 55. The method of claim 54 wherein the weight ratio of said cationic, anionic or amphoteric polymer to said nonionic polymer is in the range of from about 1:10 to about 10:1.
- 56. The method of claim 54 wherein said nonionic polymer is a natural gum.
- 57. The method of claim 54 wherein said nonionic polymer is a hydroxyalkylated natural gum.
- 58. The method of claim 54 wherein said nonionic polymer is hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 59. The method of claim 54 wherein the monomer units forming said polymer are comprised of monomer units derived from a sulfonic acid functional monomer.
- 60. The method of claim 54 wherein the monomer units forming said polymer are comprised of 2-acrylamido-2-methyl propane sulfonic acid monomer units present in said polymer in an amount in the range of from about 25 mole % to about 75 mole %.
- 61. The method of claim 60 wherein the monomer units forming said polymer are further comprised of N,N-dimethylacrylamide monomer units present in said polymer in an amount in the range of from about 10 mole % to about 40 mole %.
- 62. The method of claim 60 wherein the monomer units forming said polymer are further comprised of acrylamide monomer units present in said polymer in an amount in the range of from about 10 mole % to about 30 mole %.
- 63. The method of claim 60 wherein the monomer units forming said polymer are further comprised of acrylic acid monomer units present in said polymer in an amount in the range of from about 10 mole % to about 20 mole %.
- 64. The method of claim 60 wherein the monomer units forming said polymer are further comprised of vinyl pyrrolidone monomer units present in said polymer in an amount in the range of from about 5 mole % to about 20 mole %.
- 65. The method of claim 53 wherein said water soluble polymer complex fluid loss control additive is comprised of 1 part by weight of a polymer comprised of 70 mole % of 2-acrylamido-2-methyl propane sulfonic acid, 17 mole % of N,N-dimethylacrylamide and 13 mole % of acrylamide and 2 parts by weight of a nonionic polymer comprised of hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 66. The method of claim 53 wherein said water soluble polymer complex fluid loss control additive is comprised of 1 part by weight of a polymer comprised of 40 mole % of 2-acrylamido-2-methyl propane sulfonic acid, 30 mole % of acrylamide, 20 mole % of acrylic acid and 10 mole % of vinyl pyrrolidone and 1 part by weight of a nonionic polymer comprised of hydroxyethylcellulose having 1.5 moles of ethylene oxide substitution.
- 67. The method of claim 53 wherein said gelling agent is selected from the group consisting of guar gum, hydroxypropylguar, carboxymethylhydroxypropyl guar, hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, carboxymethylcellulose, hydroxyethylcellulose grafted with vinyl phosphonic acid, xanthan gum, welan gum and succinoglycon.
- 68. The method of claim 53 wherein said gelling agent is present in said aqueous well treating fluid in an amount in the range of from about 0.125% to about 1.5% by weight of water in said treating fluid.
- 69. The method of claim 53 wherein said aqueous well treating fluid further comprises a cross-linking agent for cross-linking said gelling agent.
- 70. The method of claim 69 wherein said cross-linking agent is selected from the group consisting of borate releasing compounds, a source of titanium ions, a source of zirconium ions, a source of antimony ions and a source of aluminum ions.
- 71. The method of claim 69 wherein said cross-linking agent is present in said aqueous well treating fluid in an amount in the range of from about 0.1% to about 2% by weight of said gelling agent in said treating fluid.
- 72. The method of claim 53 or 69 wherein said aqueous well treating fluid further comprises a delayed breaker present in an amount sufficient to effect a reduction in the viscosity of said treating fluid after said treating fluid has been in said subterranean zone for a period of time.
- 73. The method of claim 72 wherein said delayed breaker is selected from the group consisting of alkali metal and ammonium persulfates which are delayed by being encapsulated in a material which slowly releases said breaker or by a breaker selected from the group consisting of alkali metal chlorites, alkali metal hypochlorites and calcium hypochlorites.
Cross-References To Related Applications
[0001] This application claims the benefit of Provisional Application No. 60/284,043 entitled “Water Soluble Polymer Complexes” filed on Apr. 16, 2001
Provisional Applications (1)
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Number |
Date |
Country |
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60284043 |
Apr 2001 |
US |