Using synthetic acid compositions as alternatives to conventional acids in the oil and gas industry

Patent metadata

Field	Value
Publication number	US-10035944-B2
Application number	US-201515314284-A
Country	US
Kind code	B2
Filing date	May 28, 2015
Priority date	May 30, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A synthetic acid composition for use in oil industry activities is disclosed. The composition comprises urea and hydrogen chloride in a molar ratio of not less than 0.1:1; a metal iodide or iodate; an alcohol or derivative thereof. Optionally, the composition may include formic acid or a derivative thereof propylene glycol or a derivative thereof, ethylene glycol glycerol or a mixture thereof; cinnamaldehyde or a derivative thereof; and a phosphonic acid derivative.

First claim

What is claimed is:

1. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to stimulate formations.

2. The synthetic acid composition according to claim 1 , further comprising formic acid or derivative thereof.

3. The synthetic acid composition according to claim 2 , wherein the formic acid or a derivative thereof is selected from the group consisting of: formic acid, acetic acid, ethyl formate and butyl formate.

4. The synthetic acid composition according to claim 3 , where the formic acid or derivative thereof is present in an amount ranging from 0.05-2.0% by weight of the composition.

5. The synthetic acid composition according to claim 2 , where the formic acid or derivative thereof is formic acid.

6. The synthetic acid composition according to claim 1 , further comprising propylene glycol or derivative thereof, ethylene glycol, glycerol or a mixture thereof.

7. The synthetic acid composition according to claim 6 , where the compound selected from the group consisting of:
propylene glycol or derivative thereof, ethylene glycol, glycerol or a mixture thereof, is present in a range of 0.05-1.0% by weight of the composition.

8. The synthetic acid composition according to claim 1 , further comprising cinnamaldehyde or a derivative thereof.

9. The synthetic acid composition according to claim 8 where cinnamaldehyde or derivative thereof is present in the range of 0.01-1.0% by weight of the composition.

10. The synthetic acid composition according to claim 1 , wherein the urea and hydrogen chloride are in a molar ratio of not less than 0.5:1.

11. The synthetic acid composition according to claim 10 , wherein the urea and hydrogen chloride are in a molar ratio of not less than 1.0:1.

12. The synthetic acid composition according to claim 1 , wherein the phosphonic acid derivative is aminoalkylphosphonic salt.

13. The synthetic acid composition according to claim 12 , wherein the aminoalkylphosphonic salt is amino tris methylene phosphonic acid.

14. The synthetic acid composition according to claim 12 , wherein the aminoalkylphosphonic salt is present in a concentration ranging from 0.25 to 1.0% w/w.

15. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is cuprous iodide.

16. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is potassium iodide.

17. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is sodium iodide.

18. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is lithium iodide.

19. The synthetic acid composition according to claim 1 , wherein the alcohol or derivative thereof is an alkynyl alcohol or derivative thereof.

20. The synthetic acid composition according to claim 19 , wherein the alkynyl alcohol or derivative thereof is prop argyl alcohol or a derivative thereof.

21. The synthetic acid composition according to claim 19 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.1 to 2.0% w/w.

22. The synthetic acid composition according to claim 21 , wherein the alkynyl alcohol or derivative thereof is present in a concentration of 0.25% w/w.

23. The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 500 ppm.

24. The use of a synthetic acid composition according to claim 1 in the oil industry to reduce or remove wellbore damage.

25. The synthetic acid composition according to claim 1 , further comprising a phosphonic acid derivative.

26. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to treat wellbore filter cake post drilling operations.

27. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to descale pipelines and/or production wells.

28. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to increase an injectivity rate of injection wells.

29. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to lower the pH of fluids.

30. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to remove undesirable scale in surface equipment, wells and related equipment and/or facilities.

31. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to fracture wells.

32. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to perform matrix stimulations.

33. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to conduct annular and bullhead squeezes and soaks.

34. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to pickle tubing, pipe and/or coiled tubing.

35. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate;
an alcohol or derivative thereof; and
wherein the use in the oil industry is to solubilize limestone, dolomite, calcite and combinations thereof.

Assignees

• Fluid Energy Group Ltd

Inventors

• Purdy Clay
• Thatcher Darren
• Garner Jon
• Ulmer Bruce

Classifications

• C09K2208/32

  Anticorrosion additives · CPC title

• C23F11/04

  in markedly acid liquids · CPC title

• C09K2208/22

  Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers · CPC title

• C09K8/86

  containing organic compounds · CPC title

• C09K8/54

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title