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A method of providing a substantially constant rheological profile of a drilling fluid over a temperature range of about 120° F. to about 40° F. includes adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive includes the reaction product of a carboxyli

A method of providing a substantially constant rheological profile of a drilling fluid over a temperature range of about 120° F. to about 40° F. includes adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive includes the reaction product of a carboxylic acid with at least two carboxylic moieties; and a polyamine having an amine functionality of two or more. A composition, such as an oil based drilling fluid, includes the reaction product of a carboxylic acid with at least two carboxylic moieties and a polyamine having an amine functionality of two or more.

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I claim: 1. A method of providing a substantially constant rheological profile of an oil-based drilling fluid over a temperature range of about 120° F. to about 40° F. comprising adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive consists essential

I claim: 1. A method of providing a substantially constant rheological profile of an oil-based drilling fluid over a temperature range of about 120° F. to about 40° F. comprising adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive consists essentially of a reaction product of (a) a dimer fatty acid selected from the group consisting of hydrogenated, partially hydrogenated and non-hydrogenated dimer acids with from about 20 to about 48 carbon atoms, with at least two carboxylic moieties; and (b) polyethylene polyamine having an amine functionality of two or more. 2. The method of claim 1, wherein the polyamine is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetriamine and tetraethylenepentamine. 3. The method of claim 1, wherein the polyamine comprises diethylenetriamine. 4. The method of claim 1, wherein the reaction product further comprises a trimer fatty acid. 5. The method of claim 1, further comprising adding one or more emulsifiers to the drilling fluid. 6. The method of claim 1, further comprising adding an organoclay to the drilling fluid. 7. The method of claim 1, further comprising adding a non-organoclay rheological additive to the drilling fluid. 8. The method of claim 1, further comprising adding a fluid loss reducing additive to the drilling fluid. 9. The method of claim 1, further comprising adding a solvent. 10. The method of claim 1 wherein the increase in high shear rate viscosity of the drilling fluid is less than about 75% when the drilling fluid is cooled from about 120° F. to about 40° F. 11. The method of claim 1 wherein the increase in high shear rate viscosity of the drilling fluid is less than about 60% when the drilling fluid is cooled from about 120° F. to about 40° F. 12. The method of claim 1, comprising adding less than about 2 pounds per barrel (“ppb”) drilling fluid additive to the drilling fluid. 13. The method of claim 1, comprising adding less than about 1.5 ppb drilling fluid additive to the drilling fluid. 14. The method of claim 1, comprising adding less than about 1.0 ppb drilling fluid additive to the drilling fluid. 15. The method of claim 1, wherein the reaction product has an average molecular weight of about 2,000 to about 2030. 16. The method of claim 1, wherein the reaction product has an average molecular weight of about 2,010 to about 2,020. 17. A method of providing a substantially constant rheological profile of an oil-based drilling fluid over a temperature range of about 120° F. to about 40° F. comprising adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive comprises a reaction product of (a) a dimer fatty acid with at least two carboxylic moieties; and (b) a polyamine having an amine functionality of two or more wherein the drilling fluid additive has an LC50(48 h) value of greater than about 1000 mg/l as determined from the ISO 14669 protocol using acartia tonsa. 18. The method of claim 17, wherein the drilling fluid additive has an EC50(72 h) value of greater than about 400 mg/l as determined from the OECD 201 protocol using skeletonema costatum. 19. The method of claim 17, wherein the drilling fluid additive has an LC50(10 day) value of greater than about 5,000 mg/kg as determined from the PARCOM 1995 protocol using corphium volutator. 20. The method of claim 17, wherein the drilling fluid additive has an LC50(96 h) value of greater than about 400 mg/kg as determined from the PARCOM 1995 protocol using scophthalmus maximus. 21. A method of providing a substantially constant rheological profile of an oil-based drilling fluid over a temperature range of about 120° F. to about 40° F. comprising adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive comprises a reaction product of (a) a dimer fatty acid with at least two carboxylic moieties; and (b) a polyamine having an amine functionality of two or more wherein the drilling fluid additive has an environmental rating of Class C, Class D, or Class E. 22. A composition consisting essentially of a reaction product of (a) a dimer fatty acid selected from the group consisting of hydrogenated, partially hydrogenated and non-hydrogenated dimer acids with from about 20 to about 48 carbon atoms, with at least two carboxylic moieties; and (b) polyethylene polyamine having an amine functionality of two or more. 23. The composition of claim 22 wherein the polyamine is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetriamine and tetraethylenepentamine. 24. An oil-based drilling fluid comprising the composition of claim 22. 25. The oil-based drilling fluid of claim 24, wherein the increase in high shear rate viscosity of the drilling fluid is less than about 75% when the said drilling fluid is cooled from about 120° F. to about 40° F. 26. The oil-based drilling fluid of claim 24, wherein the increase in high shear rate viscosity of the drilling fluid is less than about 60% when the said drilling fluid is cooled from about 120° F. to about 40° F. 27. The composition of claim 22, wherein the polyamine comprises diethylenetriamine. 28. The composition of claim 22, wherein the reaction product further comprises a trimer fatty acid. 29. The composition of claim 22, further comprising one or more emulsifier. 30. The composition of claim 22, further comprising an organoclay. 31. The composition of claim 22, further comprising a non-organoclay rheological additive. 32. The composition of claim 22, further comprising a fluid loss reducing additive. 33. The composition of claim 22, further comprising a solvent. 34. An oil-based drilling fluid comprising less than about 2 ppb of the composition of claim 22. 35. An oil-based drilling fluid comprising less than about 1.5 ppb of the composition of claim 22. 36. An oil-based drilling fluid comprising less than about 1 ppb of the composition of claim 22. 37. The composition of claim 22, wherein the reaction product has an average molecular weight of about 2,000 to about 2,030. 38. The composition of claim 22, wherein the reaction product has an average molecular weight of about 2,010 to about 2,020. 39. A drilling fluid additive comprising the reaction product of (a) a dimer fatty acid with at least two carboxylic moieties; and (b) a polyamine having an amine functionality of two or more wherein the drilling fluid additive has an EC50(72 h) value of greater than about 400 mg/l as determined from the OECD 201 protocol using skeletonema costatum. 40. The drilling fluid additive of claim 39, wherein the drilling fluid additive has an LC50(48 h) value of greater than about 1000 mg/l as determined from the ISO 14669 protocol using acartia tonsa. 41. The drilling fluid additive of claim 39, wherein the drilling fluid additive has an LC50(10 day) value of greater than about 5,000 mg/kg as determined from the Parcom 1995 protocol using corophium volutator. 42. The drilling fluid additive of claim 39, wherein the drilling fluid additive has an LC50(96 h) value of greater than about 400 mg/kg as determined from the Parcom 1995 protocol using scophthalmus maximus. 43. A drilling fluid additive comprising the reaction product of (a) a dimer fatty acid with at least two carboxylic moieties; and (b) a polyamine having an amine functionality of two or more, wherein the drilling fluid additive has an environmental rating of Class C, Class D, or Class E.