Effective Pour Point Depressants for Amidoamine Emulsifiers

• US 20190322920A1
• Filed: 12/19/2017
• Published: 10/24/2019
• Est. Priority Date: 12/28/2016
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: M-I LLC (SLB)
• Inventors: Khramov, Dimitri M, Chen, Yiyan
• Granted Patent: US 11,066,591 B2
• Time in Patent Office: Days
• CPC Class Codes: C09K 8/34 Organic liquids
• CPC Class Codes: C09K 8/36 Water-in-oil emulsions

Abstract

A composition comprising an oleaginous base fluid, an emulsifier and a liquid tertiary amide is disclosed. A wellbore fluid may include an oleaginous continuous phase, a non-oleaginous discontinuous phase and the composition to stabilize the non-oleaginous discontinuous phase within the oleaginous continuous phase. A method comprising adding the composition to a wellbore fluid and emplacing the wellbore fluid mixed with the composition into a wellbore is also provided.

Claims

1. A composition, comprising:

an oleaginous base fluid;

an emulsifier; and

a liquid tertiary amide.

2. The composition of claim 1, wherein the liquid tertiary amide is selected from the group of cyclic or acyclic liquid tertiary amides.

3. The composition of claim 2, wherein the liquid tertiary amide has the formula R₁—

CO—

NR₂R₃, where R₁, R₂ and R₃ are the same or different.

4. The composition of claim 3, wherein any of the R₁, R₂ and R₃ groups of the liquid tertiary amide has at least 5 carbon atoms.

5. The composition of claim 4, wherein R₁ is selected from C₅-C₁₆ saturated and unsubstituted hydrocarbon chains.

6. The composition of claim 4, wherein R₁ is selected from C₅-C₂₀ unsaturated and branched hydrocarbon chains.

7. The composition of claim 4, wherein the liquid tertiary amide is selected from the group of N,N-dimethylamides.

8. The composition of claim 3, wherein R₁ and R₂ are connected or R₂ and R₃ are connected.

9. The composition of claim 1, wherein the liquid tertiary amide is a tetrasubstituted urea selected from the group of acyclic and cyclic tetrasubstituted ureas.

10. The composition of claim 1, wherein the liquid tertiary amide is present in the composition in a proportion that ranges from 0 to 30% by weight, based on the weight of the emulsifier.

11. A wellbore fluid, comprising:

a continuous oleaginous phase;

a discontinuous non-oleaginous phase; and

the composition of claim 1 stabilizing the discontinuous non-oleaginous phase within the continuous oleaginous phase.

12. A method comprising:

adding a composition to a wellbore fluid, the composition comprising an oleaginous base fluid;

an emulsifier; and

a liquid tertiary amide; and

emplacing the wellbore fluid mixed with the composition into a wellbore.

13. The method of claim 12, wherein the liquid tertiary amide is selected from the group of cyclic or acyclic liquid tertiary amides.

14. The method of claim 13, wherein the liquid tertiary amide has the formula R₁—

CO—

NR₂R₃, where R₁, R₂ and R₃ are the same or different.

15. The method of claim 14, wherein any of the R₁, R₂ and R₃ groups of the liquid tertiary amide has at least 5 carbon atoms.

16. The method of claim 14, wherein R₁ is selected from C₅-C₁₆ saturated and unsubstituted hydrocarbon chains.

17. The method of claim 14, wherein R₁ is selected from C₅-C₂₀ unsaturated and branched hydrocarbon chains.

18. The method of claim 14, wherein the liquid tertiary amide is selected from the group of N,N-dimethylamides.

19. The method of claim 14, wherein R₁ and R₂ are connected or R₂ and R₃ are connected.

20. The method of claim 12, wherein the liquid tertiary amide is a tetrasubstituted urea selected from the group of acyclic and cyclic tetrasubstituted ureas.

21. The method of claim 12, wherein the liquid tertiary amide is present in the composition in a proportion that ranges from 0 to 30% by weight, based on the weight of the emulsifier.