Novel Modified Acid Compositions as Alternatives to Conventional Acids in the Oil and Gas Industry

Patent metadata

Field	Value
Publication number	US-2019040298-A1
Application number	US-201815992951-A
Country	US
Kind code	A1
Filing date	May 30, 2018
Priority date	Jun 2, 2017
Publication date	Feb 7, 2019
Grant date	—

Abstract

An aqueous modified acid composition for industrial activities, said composition comprising: an alkanolamine and strong acid in a molar ratio of not less than 1:15, preferably not less than 1:10; it can also further comprise a metal iodide or iodate. Said composition demonstrates advantages over known conventional acids and modified acids.

First claim

1 . An aqueous modified acid composition comprising:
a mineral acid and an alkanolamine in a molar ratio of not more than 15:1.

2 . A aqueous modified acid composition comprising:
hydrochloric acid and an alkanolamine in a molar ratio of not more than 15:1.

3 . The aqueous modified acid composition according to claim 2 , wherein the hydrochloric acid and alkanolamine are present in a molar ratio of not more than 10:1.

4 . The aqueous modified acid composition according to claim 2 , wherein the hydrochloric acid and alkanolamine are present in a molar ratio of not more than 7.0:1.

5 . The aqueous modified acid composition according to claim 2 , wherein the hydrochloric acid and alkanolamine are present in a molar ratio of not more than 4.1:1.

6 . The aqueous modified acid composition according to claim 2 , wherein the hydrochloric acid and alkanolamine are present in a molar ratio of not less than 3:1.

7 . The aqueous modified acid composition according to any one of claims 1 to 6 , wherein the alkanolamine is selected from the group consisting of: monoethanolamine; diethanolamine; triethanolamine and combinations thereof.

8 . The aqueous modified acid composition according to any one of claims 1 to 7 , wherein the alkanolamine is monoethanolamine.

9 . The aqueous modified acid composition according to any one of claims 1 to 7 , wherein the alkanolamine is diethanolamine.

10 . The aqueous modified acid composition according to any one of claims 1 to 9 , further comprising a metal iodide or iodate.

11 . The composition according to claim 1 , wherein the mineral acid is selected from the group consisting of: HCl, nitric acid, sulfuric acid, sulfonic acid, phosphoric acid, and combinations thereof.

12 . The aqueous modified acid composition according to any one of claims 1 to 11 , further comprising a metal iodide or iodate.

13 . The modified acid composition according to any one of claims 1 to 12 , further comprising an alcohol or derivative thereof.

14 . The modified acid composition according to claim 12 , wherein the metal iodide or iodate is selected from the group consisting of: cuprous iodide; potassium iodide; sodium iodide; lithium iodide and combinations thereof.

15 . The modified acid composition according to claim 12 , wherein the metal iodide or iodate is potassium iodide.

16 . The modified acid composition according to any one of claims 13 to 15 , wherein the alcohol or derivative thereof is an alkynyl alcohol or derivative thereof.

17 . The modified acid composition according to claim 16 , wherein the alkynyl alcohol or derivative thereof is propargyl alcohol or a derivative thereof.

18 . The modified acid composition according to claim 16 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 5% w/w.

19 . The modified acid composition according to claim 16 , wherein the alkynyl alcohol or derivative thereof is present in a concentration of 0.2% w/w.

20 . The modified acid composition according to any one of claims 12 to 19 , wherein the metal iodide is present in a concentration ranging from 0.1 to 2% by weight of the total weight of the composition.

21 . The modified acid of any one of claims 1 to 20 further comprising a corrosion inhibitor comprising a α,β-unsaturated aldehyde with no methyl group at the alpha position.

22 . The modified acid according to claim 21 , where the α,β-unsaturated aldehyde with no methyl group at the alpha position is selected from the group consisting of: citral and cinnamaldehyde

23 . The use of a modified acid composition according to any one of claims 1 to 22 in the oil industry—wherein the use comprises an activity selected from the group consisting of: stimulate formations; assist in reducing breakdown pressures during downhole pumping operations; treat wellbore filter cake post drilling operations; assist in freeing stuck pipe; descale pipelines and/or production wells; increase injectivity of injection wells; lower the pH of a fluid; remove undesirable scale on a surface selected from the group consisting of: equipment, wells and related equipment and facilities; fracture wells; matrix stimulations; conduct annular and bullhead squeezes & soaks; pickle tubing, pipe and/or coiled tubing; increase effective permeability of formations; reduce or remove wellbore damage; clean perforations; and solubilize limestone, dolomite, calcite and combinations thereof.

24 . The use of a modified acid composition according to any one of claims 1 to 22 in the mining industry said use being selected from the group consisting of: treating scale and adjusting pH levels in fluid systems.

25 . The use of a modified acid composition according to any one of claims 1 to 22 in the water treatment industry said use being selected from the group consisting of: adjusting pH and neutralizing alkaline effluent.

26 . The use of a modified acid composition according to any one of claims 1 to 22 in the fertilizer/landscaping industry to adjust the pH level of a soil.

27 . The use of a modified acid composition according to any one of claims 1 to 22 to regenerate ion exchange beds.

28 . The use of a modified acid composition according to any one of claims 1 to 22 in the construction industry said use being selected from the group consisting of: etching concrete and cleaning concrete from equipment and buildings.

29 . The use of a modified acid composition according to any one of claims 1 to 22 in the electrical generation industry, said use being selected from the group consisting of: descaling pipelines and related equipment and descaling facilities.

30 . The use of a modified acid composition according to any one of claims 1 to 22 in the food and dairy industry, said use being selected from the group consisting of: manufacturing protein, manufacturing starch, demineralizing whey, manufacturing casein and regenerating ion exchange resins.

31 . The use of a modified acid composition according to any one of claims 1 to 22 in the pool industry to lower the pH of fluids.

32 . The use of a modified acid composition according to any one of claims 1 to 22 in the manufacturing industry to perform an operation selected from the group consisting of: pickling steel and cleaning metal.

33 . The use of a modified acid composition according to any one of claims 1 to 22 in the retail industry as a low pH cleaning additive.

Assignees

• Fluid Energy Group Ltd

Inventors

• Purdy Clay
• Weissenberger Markus

Classifications

• C05B11/04

  using mineral acid · CPC title

• C09K8/72

  Eroding chemicals, e.g. acids · CPC title

• C05G5/23

  Solutions · CPC title

• C04B41/5315

  Cleaning compositions, e.g. for removing hardened cement from ceramic tiles · CPC title

• C23F11/04

  in markedly acid liquids · CPC title