Synthetic acid compositions alternatives to conventional acids for use in the oil and gas industry

Patent metadata

Field	Value
Publication number	US-2017210980-A1
Application number	US-201515515458-A
Country	US
Kind code	A1
Filing date	Sep 29, 2015
Priority date	Oct 2, 2014
Publication date	Jul 27, 2017
Grant date	—

Abstract

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 and formic acid or a derivative thereof.

First claim

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; and formic acid or a derivative thereof.

2 . The synthetic acid composition according to claim 1 , wherein the formic acid or a derivative thereof is selected from the group consisting of: formic acid, acetic acid, ethylformate and butyl formate.

3 . The synthetic acid composition according to claim 1 , wherein the formic acid or a derivative thereof is selected from the group consisting of: formic acid, acetic acid, ethylformate and butyl formate, and is present in an amount ranging from 0.05-2.0%.

4 . The synthetic acid composition according to claim 1 , wherein the formic acid or a derivative thereof is selected from the group consisting of: formic acid, acetic acid, ethylformate and butyl formate, and is present in an amount of approximately 0.1%.

5 . 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.

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

7 - 9 . (canceled)

10 . The synthetic acid composition according to claim 1 , further comprising a metal iodide or iodate selected from the group consisting of: potassium iodide, sodium iodide, cuprous iodide and lithium iodide.

11 . (canceled)

12 . The synthetic acid composition according claim 1 , further comprising potassium iodide.

13 - 14 . (canceled)

15 . The synthetic acid composition according claim 1 , further comprising an alcohol or derivative thereof.

16 . The synthetic acid composition according to claim 1 , further comprising an alkynyl alcohol or derivative thereof.

17 . The synthetic acid composition according to claim 1 , further comprising propargyl alcohol or a derivative thereof.

18 - 19 . (canceled)

20 . The synthetic acid composition according to claim 1 , further comprising an alcohol or derivative thereof present in a concentration ranging from 0.01 to 0.25% w/w.

21 . The synthetic acid composition according to claim 20 , wherein the alcohol or derivative thereof is present in a concentration of 0.1% w/w.

22 . The synthetic acid composition according to claim 1 , further comprising a metal iodide present in a concentration ranging from 100 to 1000 ppm.

23 . A method for the use of a synthetic acid composition in oil industry activities, said synthetic acid composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1; and formic acid or a derivative thereof; the method comprising performing with the synthetic acid an oil industry activity selected from the group consisting of: stimulating formations; assisting in reducing breakdown pressures during downhole pumping operations; treating wellbore filter cake post drilling operations; assisting in freeing stuck pipe; descaling pipelines and/or production wells; increasing injectivity of injection wells; lowering the pH of a fluid; removing undesirable scale on a surface selected from the group consisting of: equipment, wells and related equipment and facilities; fracturing wells; completing matrix stimulations conducting annular and bullhead squeezes and soaks; pickling tubing, pipe and/or coiled tubing; increasing permeability of formations; reducing or removing wellbore damage; cleaning perforations; and solubilizing limestone, dolomite, calcite and combinations thereof.

24 - 38 . (canceled)

Assignees

• Fluid Energy Group Ltd

Inventors

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

Classifications

• C09K8/528 Primary

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C23F15/00

  Other methods of preventing corrosion or incrustation · CPC title

• C09K8/72 Primary

  Eroding chemicals, e.g. acids · CPC title

• C09K8/74

  combined with additives added for specific purposes · CPC title

• C09K2208/02

  Spotting, i.e. using additives for releasing a stuck drill · CPC title