Claims
- 1. An aqueous drilling fluid having present in an amount sufficient to reduce fluid loss of said drilling fluid, at least one polymer of (1) from about 5% to about 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid and (2) from about 95% to about 50% by weight of a second component, there being from 100% to about 80% by weight of acrylic acid and from 0% by weight to about 20% by weight of itaconic acid in the second component, said polymer having a weight average molecular weight of between about 50,000 to about 1,000,000 being in its free acid or partially or completely neutralized form and being at least water dispersible.
- 2. The drilling fluid of claim 1 wherein the weight average molecular weight of said polymer is between about 100,000 to about 500,000.
- 3. The drilling fluid of claim 2 wherein said drilling fluid is a mud containing soluble calcium or chloride ions.
- 4. The drilling fluid composition of claim 3 wherein said polymer is present in an amount of from about 0.5 to about 10 pounds per 42 gallon barrel of drilling fluid.
- 5. The drilling fluid composition of claim 4 wherein said polymer is in the form of at least one free acid or partial or complete sodium, potassium, ammonium, organic amine or quaternary ammonium salt, said salt containing one or more of sodium, potassium, ammonium, organic amine or quaternary ammonium cations.
- 6. The drilling fluid composition of claim 5 wherein said polymer is a copolymer of about 10% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 90% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 7. The drilling fluid composition of claim 5 wherein said polymer is a copolymer of about 30% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 70% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 8. The drilling fluid composition of claim 5 wherein said polymer is a copolymer of about 40% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 60% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 9. The drilling fluid composition of claim 5 wherein said polymer is a copolymer of about 20% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 80% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary salt.
- 10. The drilling fluid composition of claim 5 wherein said polymer is a terpolymer of about 19% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 76% by weight acrylic acid and about 5% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 11. The drilling fluid composition of claim 5 wherein said polymer is a terpolymer of about 38% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 57% by weight acrylic acid and about 5% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 12. The drilling fluid composition of claim 5 wherein said polymer is a terpolymer of about 18% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 72% by weight acrylic acid and about 10% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 13. The drilling fluid composition of claim 5 wherein said polymer is a terpolymer of about 36% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 54% by weight acrylic acid and about 10% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 14. In a method of drilling a well into a subterranean formation in which an aqueous drilling fluid is circulated into the well, the step of circulating said drilling fluid, containing in an amount sufficient to reduce fluid loss of said drilling fluid, at least one polymer of (1) from about 5% to about 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid and (2) from about 95% to about 50% by weight of a second component, there being from 100% to about 80% by weight of acrylic acid and from 0% by weight to about 20% by weight of itaconic acid in the second component, said polymer having a weight average molecular weight of between about 50,000 to about 1,000,000, being in its free acid or partially or completely neutralized form and being at least water dispersible.
- 15. The method of claim 14 wherein the weight average molecular weight of said copolymer is between about 100,000 to about 500,000.
- 16. The method of claim 15 wherein said drilling fluid is a mud containing soluble calcium or chloride ions.
- 17. The method of claim 16 wherein said polymer is present in said drilling fluid in an amount of from about 0.5 to about 10 pounds per 42 gallon barrel of drilling fluid.
- 18. The method of claim 17 wherein said polymer is in the form of at least one free acid or partial or complete sodium, potassium, ammonium, organic amine or quaternary ammonium salt, said salt containing one or more of sodium, potassium, ammonium, organic amine or quaternary ammonium cations.
- 19. The method of claim 18 wherein said polymer is a copolymer of from about 10% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 90% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 20. The method of claim 18 wherein said polymer is a copolymer of from about 30% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 70% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 21. The method of claim 18 wherein said polymer is a copolymer of from about 40% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 60% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 22. The method of claim 18 wherein said polymer is a copolymer of from about 20% by weight 2-acrylamido-2-methylpropane sulfonic acid and about 80% by weight acrylic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 23. The method of claim 18 wherein said polymer is a terpolymer of about 19% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 76% by weight acrylic acid and about 5% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 24. The method of claim 18 wherein said polymer is a terpolymer of about 38% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 57% by weight acrylic acid and about 5% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 25. The method of claim 18 wherein said polymer is a terpolymer of about 18% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 72% by weight acrylic acid and about 10% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
- 26. The method of claim 18 wherein said polymer is a terpolymer of about 36% by weight 2-acrylamido-2-methylpropane sulfonic acid, about 54% by weight acrylic acid and about 10% by weight itaconic acid in the form of its free acid or partially or completely neutralized sodium, potassium, ammonium, organic amine or quaternary ammonium salt.
Parent Case Info
This is a division, of application Ser. No. 608,864, filed May 10, 1984 U.S. Pat. No. 4,622,373.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
Country |
Parent |
608864 |
May 1984 |
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