Claims
- 1. A method of stabilizing a subterranean formation that comprises a shale comprising:
contacting the subterranean formation that comprises a shale with a treatment fluid, the treatment fluid comprising:
a base fluid, and a hydrophobically modified polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- 2. The method of claim 1 wherein the treatment fluid is a drilling fluid.
- 3. The method of claim 1 wherein the hydrophobically modified polymer has a molecular weight in the range of from about 100,000 to about 10,000,000.
- 4. The method of claim 1 wherein the hydrophobically modified polymer is a reaction product of a hydrophobic compound and a hydrophilic polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms.
- 5. The method of claim 4 wherein the hydrophobically modified polymer has a mole ratio of a hydrophilic monomer to the hydrophobic compound in the range of from about 99.98:0.02 to about 90:10, wherein the hydrophilic monomer is a calculated amount present in the hydrophilic polymer.
- 6. The method of claim 4 wherein the hydrophilic polymer is a homopolymer, a copolymer, or a terpolymer.
- 7. The method of claim 4 wherein the hydrophilic polymer comprises a cellulose, a chitosan, a polyamide, a polyetheramine, a polyethyleneimine, a polyhydroxyetheramine, a polylysine, a polysulfone, a gum, or a starch, or a derivative thereof.
- 8. The method of claim 4 wherein the hydrophilic polymer contains reactive amino groups as pendant groups or in the polymer backbone.
- 9. The method of claim 4 wherein the hydrophilic polymer comprises a dialkyl amino pendant group.
- 10. The method of claim 4 wherein the hydrophilic polymer comprises a dimethyl amino pendant group and at least one monomer comprising dimethylaminoethyl methacrylate or dimethylaminopropyl methacrylamide.
- 11. The method of claim 4 wherein the hydrophobic compound comprises an alkyl halide, a sulfonate, a sulfate, or an organic acid derivative.
- 12. The method of claim 11 wherein the organic acid derivative comprises an octenyl succinic acid; a dodecenyl succinic acid; an anhydride of octenyl succinic acid, an ester octenyl of octenyl succinic acid, an amide of octenyl succinic acid, an anhydride of dodecenyl succinic acid, an ester of dodecenyl succinic acid, or an amide of dodecenyl succinic acid.
- 13. The method of claim 1 wherein the hydrophobically modified polymer is present in the treatment fluid in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid.
- 14. A method of stabilizing a subterranean formation that comprises a shale comprising:
contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising:
a base fluid, and a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polyvinylamine, or a poly(vinylamine/vinyl alcohol).
- 15. The method of claim 14 wherein the treatment fluid is a drilling fluid.
- 16. The method of claim 14 wherein the hydrophobically modified polymer has a mole ratio of a hydrophilic monomer to the hydrophobic compound in the range of from about 99.98:0.02 to about 90:10, wherein the hydrophilic monomer is a calculated amount present in the hydrophilic polymer.
- 17. The method of claim 14 wherein the hydrophobic compound comprises an alkyl halide, a sulfonate, a sulfate, or an organic acid derivative.
- 18. The method of claim 16 wherein the organic acid derivative comprises an octenyl succinic acid; a dodecenyl succinic acid; or an anhydride, an ester, or an amide of octenyl succinic acid or dodecenyl succinic acid.
- 19. The method of claim 14 wherein the hydrophobically modified polymer is present in the treatment fluid in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid.
- 20. A method of stabilizing a subterranean formation that comprises a shale comprising:
contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising: a base fluid, and a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- 21. The method of claim 20 wherein the treatment fluid is a drilling fluid.
- 22. The method of claim 20 wherein the hydrophobically modified polymer has a molecular weight in the range of from about 100,000 to about 10,000,000.
- 23. The method of claim 20 wherein the hydrophilic polymer comprises a dimethyl amino pendant group and at least one monomer comprising dimethylaminoethyl methacrylate or dimethylaminopropyl methacrylamide.
- 24. The method of claim 20 wherein the hydrophilic polymer comprises a dialkyl amino pendant group.
- 25. The method of claim 20 wherein the hydrophobically modified polymer has a mole ratio of a hydrophilic monomer to the hydrophobic compound in the range of from about 99.98:0.02 to about 90:10, wherein the hydrophilic monomer is a calculated amount present in the hydrophilic polymer.
- 26. The method of claim 20 wherein the hydrophilic polymer comprises polydimethylaminoethyl methacrylate, polydimethylaminopropyl methacrylamide, poly(acrylamide/dimethylaminoethyl methacrylate), poly(acrylic acid/dimethylaminoethyl methacrylate), poly(methacrylic acid/dimethylaminoethyl methacrylate), poly(2-acrylamido-2-methyl propane sulfonic acid/dimethylaminoethyl methacrylate), poly(acrylamide/dimethylaminopropyl methacrylamide), poly(acrylic acid/dimethylaminopropyl methacrylamide), or poly(methacrylic acid/dimethylaminopropyl methacrylamide).
- 27. The method of claim 20 wherein the hydrophobic compound comprises an alkyl halide, a sulfonate, a sulfate, or an organic acid derivative.
- 28. The method of claim 27 wherein the organic acid derivative comprises an octenyl succinic acid; a dodecenyl succinic acid; an anhydride of octenyl succinic acid, an ester octenyl of octenyl succinic acid, an amide of octenyl succinic acid, an anhydride of dodecenyl succinic acid, an ester of dodecenyl succinic acid, or an amide of dodecenyl succinic acid.
- 29. The method of claim 20 wherein the hydrophobically modified polymer is present in the treatment fluid in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid.
- 30. A method of stabilizing a subterranean formation that comprises a shale comprising:
contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising:
a base fluid, and a hydrophobically modified polymer formed from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the hydrophilic monomer comprises N,N-dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl methacrylate; dimethylaminopropylmethacrylamide; vinyl amine; vinyl acetate; trimethylammoniumethyl methacrylate chloride; hydroxyethyl acrylate; vinyl sulfonic acid; vinyl phosphonic acid; vinyl caprolactam; N-vinylformamide; N,N-diallylacetamide; dimethyldiallyl ammonium halide; styrene sulfonic acid; or a quaternary salt derivative of acrylamide.
- 31. The method of claim 30 wherein the treatment fluid is a drilling fluid.
- 32. The method of claim 30 wherein the hydrophobically modified polymer has a molecular weight in the range of from about 100,000 to about 10,000,000.
- 33. The method of claim 30 wherein the hydrophobically modified hydrophilic monomer comprises an alkyl acrylate, an alkyl methacrylate, an alkyl acrylamide, an alkyl methacrylamide, an alkyl dimethylammoniumethyl methacrylate halide, or an alkyl dimethylammoniumpropyl methacrylamide halide, wherein the alkyl groups have from about 4 to about 22 carbon atoms.
- 34. The method of claim 30 wherein the hydrophobically modified polymer has a mole ratio of the hydrophilic monomer to the hydrophobically modified hydrophilic monomer in the range of from about 99.98:0.02 to about 90:10.
- 35. The method of claim 30 wherein the hydrophobically modified polymer is present in the treatment fluid in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid.
- 36. A method of stabilizing a subterranean formation that comprises a shale comprising:
contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising:
a base fluid, and a hydrophilically modified polymer.
- 37. The method of claim 36 wherein the treatment fluid is a drilling fluid.
- 38. The method of claim 36 wherein the hydrophilically modified polymer has a molecular weight in the range of from about 100,000 to about 10,000,000.
- 39. The method of claim 36 wherein the hydrophilically modified polymer comprises a polymer backbone, the polymer backbone comprising polar heteroatoms.
- 40. The method of claim 36 wherein the hydrophilically modified polymer is a reaction product of a hydrophilic polymer and a hydrophilic compound.
- 41. The method of claim 40 wherein the hydrophilically modified polymer has a weight ratio of the hydrophilic polymer to the hydrophilic compound in the range of from about 1:1 to about 10:1.
- 42. The method of claim 40 wherein the hydrophilic polymer is a homopolymer, a copolymer, or a terpolymer.
- 43. The method of claim 40 wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- 44. The method of claim 40 wherein the hydrophilic polymer comprises a dialkyl amino pendant group.
- 45. The method of claim 40 wherein the hydrophilic polymer comprises a dimethyl amino pendant group and at least one monomer comprising dimethylaminoethyl methacrylate or dimethylaminopropyl methacrylamide.
- 46. The method of claim 40 wherein the hydrophilic polymer comprises a polyacrylamide, a polyvinylamine, a poly(vinylamine/vinyl alcohol), or an alkyl acrylate polymer.
- 47. The method of claim 40 wherein the hydrophilic polymer comprises polydimethylaminoethyl methacrylate, polydimethylaminopropyl methacrylamide, poly(acrylamide/dimethylaminoethyl methacrylate), poly(acrylic acid/dimethylaaminoethyl methacrylate), poly(methacrylic acid/dimethylaminoethyl methacrylate), poly(2-acrylamido-2-methyl propane sulfonic acid/dimethylaminoethyl methacrylate), poly(acrylamide/dimethylaminopropyl methacrylamide), poly(acrylic acid/dimethylaminopropyl methacrylamide), or poly(methacrylic acid/dimethylaminopropyl methacrylamide).
- 48. The method of claim 40 wherein the hydrophilic polymer comprises a cellulose, a chitosan, a polyamide, a polyetheramine, a polyethyleneimine, a polyhydroxyetheramine, a polylysine, a polysulfone, a gum, or a starch, or a derivative thereof.
- 49. The method of claim 40 wherein the hydrophilic compound comprises a polyether comprising a halogen; a sulfonate; a sulfate; or an organic acid derivative.
- 50. The method of claim 49 wherein the polyether comprises a polyethylene oxide, a polypropylene oxide, or a polybutylene oxide, or a copolymer, a terpolymer, or a mixture thereof.
- 51. The method of claim 49 wherein the polyether comprises an epichlorohydrin-terminated polyethylene oxide methyl ether.
- 52. The method of claim 51 wherein the water-soluble hydrophilic polymer comprises polydimethylaminoethyl methacrylate, and the hydrophilically modified polymer having a weight ratio of polydimethylaminoethyl methacrylate to epichlorohydrin-terminated polyethyleneoxide methyl ether of 3:1.
- 53. The method of claim 40 wherein the hydrophilically modified polymer is the reaction product of polydimethylaminoethyl methacrylate with epichlorohydrin-terminated polyethyleneoxide methyl ether; the reaction product of polydimethylaminopropyl methacrylamide with epichlorohydrin-terminated polyethyleneoxide methyl ether; or the reaction product of poly(acrylamide/dimethylaminopropyl methacrylamide) with epichlorohydrin-terminated polyethyleneoxide methyl ether.
- 54. The method of claim 36 wherein the hydrophilically modified polymer is present in the treatment fluid in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid.
- 55. A shale-inhibiting component comprising a hydrophobically modified polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- 56. The shale-inhibiting component of claim 55 wherein the hydrophobically modified polymer is a reaction product of a hydrophobic compound and a hydrophilic polymer.
- 57. The shale-inhibiting component of claim 56 wherein the hydrophilic polymer comprises a cellulose, a chitosan, a polyamide, a polyetheramine, a polyethyleneimine, a polyhydroxyetheramine, a polylysine, a polysulfone, a gum, or a starch, or a derivative thereof.
- 58. The shale-inhibiting component of claim 56 wherein the hydrophobic compound comprises an alkyl halide, a sulfonate, a sulfate, or an organic acid derivative.
- 59. A drilling fluid for use in subterranean applications comprising a shale-inhibiting component according to claim 55.
- 60. A method of reducing the tendency of shale to swell when exposed to a treatment fluid comprising adding to the treatment fluid a shale-inhibiting component according to claim 55.
- 61. A shale-inhibiting component comprising a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polyvinylamine, or a poly(vinylamine/vinyl alcohol).
- 62. The shale-inhibiting component of claim 61 wherein the hydrophobic compound comprises an alkyl halide, a sulfonate, a sulfate, or an organic acid derivative.
- 63. A drilling fluid for use in subterranean applications comprising a shale-inhibiting component according to claim 61.
- 64. A method of reducing the tendency of shale to swell when exposed to a treatment fluid comprising adding to the treatment fluid a shale-inhibiting component according to claim 61.
- 65. A shale-inhibiting component comprising a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- 66. The shale-inhibiting component of claim 65 wherein the hydrophilic polymer comprises polydimethylaminoethyl methacrylate, polydimethylaminopropyl methacrylamide, poly(acrylamide/dimethylaminoethyl methacrylate), poly(acrylic acid/dimethylaminoethyl methacrylate), poly(methacrylic acid/dimethylaminoethyl methacrylate), poly(2-acrylamido-2-methyl propane sulfonic acid/dimethylaminoethyl methacrylate), poly(acrylamide/dimethylaminopropyl methacrylamide), poly(acrylic acid/dimethylaminopropyl methacrylamide), or poly(methacrylic acid/dimethylaminopropyl methacrylamide).
- 67. The shale-inhibiting component of claim 65 wherein the hydrophobic compound comprises an alkyl halide, a sulfonate, a sulfate, or an organic acid derivative.
- 68. A drilling fluid for use in subterranean applications comprising a shale-inhibiting component according to claim 65.
- 69. A method of reducing the tendency of shale to swell when exposed to a treatment fluid comprising adding to the treatment fluid a shale-inhibiting component according to claim 65.
- 70. A shale-inhibiting component comprising a hydrophobically modified polymer formed from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the hydrophilic monomer comprises N,N-dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl methacrylate; dimethylaminopropylmethacrylamide; vinyl amine; vinyl acetate; trimethylammoniumethyl methacrylate chloride; hydroxyethyl acrylate; vinyl sulfonic acid; vinyl phosphonic acid; vinyl caprolactam; N-vinylformamide; N,N-diallylacetamide; dimethyldiallyl ammonium halide; styrene sulfonic acid; or a quaternary salt derivative of acrylamide.
- 71. The shale-inhibiting component of claim 70 wherein the hydrophobically modified hydrophilic monomer comprises an alkyl acrylate, an alkyl methacrylate, an alkyl acrylamide, an alkyl methacrylamide, an alkyl dimethylammoniumethyl methacrylate halide, or an alkyl dimethylammoniumpropyl methacrylamide halide, wherein the alkyl groups have from about 4 to about 22 carbon atoms.
- 72. A drilling fluid for use in subterranean applications comprising a shale-inhibiting component according to claim 70.
- 73. A method of reducing the tendency of shale to swell when exposed to a treatment fluid comprising adding to the treatment fluid a shale-inhibiting component according to claim 70.
- 74. A shale-inhibiting component comprising a hydrophilically modified polymer.
- 75. The shale-inhibiting component of claim 74 wherein the hydrophilically modified polymer comprises a polymer backbone that comprises polar heteroatoms.
- 76. The shale-inhibiting component of claim 74 wherein the hydrophilically modified polymer is a reaction product of a hydrophilic compound and a hydrophilic polymer.
- 77. The shale-inhibiting component of claim 76 wherein the hydrophilic polymer comprises a polyacrylamide, polyvinylamine, a poly(vinylamine/vinyl alcohol), or an alkyl acrylate polymer.
- 78. The shale-inhibiting component of claim 76 wherein the hydrophilic polymer comprises a cellulose, a chitosan, a polyamide, a polyetheramine, a polyethyleneimine, a polyhydroxyetheramine, a polylysine, a polysulfone, a gum, or a starch, or a derivative thereof.
- 79. The shale-inhibiting component of claim 76 wherein the hydrophilic compound comprises a polyether comprising a halogen; a sulfonate; a sulfate; or an organic acid derivative.
- 80. A drilling fluid for use in subterranean applications comprising a shale-inhibiting component according to claim 74.
- 81. A method of reducing the tendency of shale to swell when exposed to a treatment fluid comprising adding to the treatment fluid a shale-inhibiting component according to claim 74.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of U.S. application Ser. No. 10/236,722 entitled “Compositions for and Methods of Stabilizing Subterranean Formations Containing Clays,” filed on Sep. 6, 2002, and U.S. application Ser. No. 10/806,894 entitled “Permeability-Modifying Drilling fluids and Methods of Use,” filed on Mar. 23, 2004.
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
10236722 |
Sep 2002 |
US |
Child |
10862132 |
Jun 2004 |
US |
Parent |
10806894 |
Mar 2004 |
US |
Child |
10862132 |
Jun 2004 |
US |