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1. WO2007149781 - HIGHLY BRANCHED POLYMERIC MATERIALS AS COATING ON WEIGHTING AGENTS

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[ EN ]

CLAIMS

What is claimed:

1. A wellbore fluid having at least two phases, the wellbore fluid comprising
a fluid phase; and
a solid phase including a powdered solid material coated with a polymer, wherein the polymer is the reaction product of a polyesteramide and a crosslinking agent.

2. The wellbore fluid of claim 1, wherein the polyesteramide is a polycondensate of a cyclic anhydride and aminodiol.

3. The wellbore fluid of claim 1, wherein the crosslinking agent comprises at least one of an epoxidized oil, epoxidized 1 ,6-hexanediol, aziridine derivatives, epoxy functionalized polyalkalene glycols, an oxidized starch, a polymeric dialdehyde, an aldehyde adduct, a tetra methoxy propane, and a hydrolized acetal.

4. The wellbore fluid of claim 1 , wherein the polyesteramide comprises fatty acid end groups.

5. The wellbore fluid of claim 1, wherein the polyesteramide comprises compounds represented by the general formula:


wherein R is selected from a straight or branched chain or cyclic aliphatic group and an aromatic group; X is selected from N and O; L] and L2 are independently Ci-C30 aliphatic groups; and n has a value ranging from 2 to 50.

6. The wellbore fluid of claim 1 , wherein the powdered solid material is selected from at least one of barite, hematite, calcite, calcium carbonate, and mixtures thereof.

7. The wellbore fluid of claim 1, wherein the fluid phase is selected from the group consisting of: an aqueous fluid, an oleaginous fluid and mixtures thereof.

8. The wellbore fluid of claim 7, wherein the aqueous fluid is selected from at least one of fresh water, sea water, brine, and combinations thereof.

9. The wellbore fluid of claim 7, wherein the oleaginous fluid is selected from at least one of mineral oil, synthetic oil, paraffin, olefins, esters, and combinations thereof.

10. A method of modifying the surface of a powdered solid material, the method comprising:
contacting the powdered solid material with a solution including a polyesteramide; and
reacting the branched polyesteramide compound with a crosslinking agent.

11. The method of claim 10, wherein the powdered solid material is selected from at least one of barite, hematite, calcite, calcium carbonate, and mixtures thereof.

12. The method of claim 10, wherein the polyesteramide is a polycondensate of a cyclic anhydride and aminodiol.

13. The method of claim 10, wherein the crosslinking agent comprises at least one of an epoxidized oil.

14. The method of claim 10, wherein the polyesteramide comprises fatty acid end groups.

15. The method of claim 10, wherein the polyesteramide comprises compounds represented by the general formula:


wherein R is selected from a straight or branched chain or cyclic aliphatic group and an aromatic group; X is selected from N and O; Li and L2 are independently C 1-C30 aliphatic groups; and n has a value ranging from 2 to 50.

16. Polymer coated solids for use in a wellbore fluid, comprising:
a powdered solid material; and
a polymer coating on the surface of the solid material, wherein the polymer coating is the reaction product of a polyesteramide and a crosslinking agent.

17. The polymer coated solids of claim 16, wherein the powdered solid material is selected from at least one of barite, hematite, calcite, calcium carbonate, and mixtures thereof.

18. The polymer coated solids of claim 16, wherein the polyesteramide is a polycondensate of a cyclic anhydride and aminodiol.

19. The polymer coated solids of claim 16, wherein the crosslinking agent comprises at least one of an epoxidized oil.

20. The polymer coated solids of claim 16, wherein the polyesteramide comprises fatty acid end groups.

21. The polymer coated solids of claim 16, wherein the polyesteramide comprises compounds represented by the general formula:


wherein R is selected from a straight or branched chain or cyclic aliphatic group and an aromatic group; X is selected from N and O; Lj and L2 are independently C1-C30 aliphatic groups; and n has a value ranging from 2 to 50.

2. A method of drilling a subterranean formation with an invert emulsion drilling fluid, comprising:
mixing an oleaginous fluid, a non-oleaginous fluid, and a powdered solid material coated with a polymer, wherein the polymer is the reaction product of a polyesteramide and a crosslinking agent to form an invert emulsion; and drilling said formation using said invert emulsion as the drilling fluid.