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

Patent metadata

Field	Value
Publication number	US-2016347994-A1
Application number	US-201615160467-A
Country	US
Kind code	A1
Filing date	May 20, 2016
Priority date	May 28, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A synthetic acid composition for use in oil industry activities, said composition comprising: urea and methanesulphonic acid in a molar ratio of not less than 0.1:1; a metal iodide or iodate; an alcohol or derivative thereof.

First claim

1 . A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and methanesulphonic acid in a molar ratio of not less than 0.1:1; a metal iodide or iodate; and an alcohol or derivative thereof.

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

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

4 . The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is selected from the group consisting of: cuprous iodide; potassium iodide; sodium iodide; and lithium iodide.

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

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

7 . The synthetic acid composition according to claim 1 , wherein the alkynyl alcohol or derivative thereof is propargyl alcohol or a derivative thereof.

8 . The synthetic acid composition according to claim 1 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 2.0% w/w.

9 . The synthetic acid composition according to claim 1 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 1.0% w/w.

10 . The synthetic acid composition according to claim 1 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 0.5% w/w.

11 . The synthetic acid composition according to claim 1 , wherein the alkynyl alcohol or derivative thereof is present in a concentration of 0.2% w/w.

12 . The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 10000 ppm.

13 . The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 5000 ppm.

14 . The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration of 1000 ppm.

15 . The use of a synthetic acid composition according to claim 1 in the oil industry to perform 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; complete matrix stimulations; conduct annular and bullhead squeezes and 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.

16 . A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and methanesulphonic acid in a molar ratio of not less than 0.1:1; water; a metal iodide or iodate; and an alcohol or derivative thereof,
wherein no less than 97% of the weight of the composition is comprised of the water, the urea and the methanesulfonic acid.

17 . A composition according to claim 16 , wherein no less than 98.9% of the weight of the composition is comprised of the water, the urea and the methanesulfonic acid.

18 . A composition according to claim 17 for use in solubilising CaCO 3 from rock formations.

19 . The use of a synthetic acid composition in oil industry activities, said composition comprising:
urea and methanesulphonic acid in a molar ratio of not less than 0.1:1; a metal iodide or iodate in an amount ranging from 1000 ppm to 10000 ppm; and an alcohol or derivative thereof in an amount ranging from 0.01 to 2.0% w/w of the composition;
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; complete matrix stimulations; conduct annular and bullhead squeezes and 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.

Assignees

• Fluid Energy Group Ltd

Inventors

• Purdy Clay
• Thatcher Darren
• Garner Jon
• Ulmer Bruce
• Jamieson Alexander David

Classifications

• E21B43/27

  by use of eroding chemicals, e.g. acids · CPC title

• E21B43/25

  Methods for stimulating production {(by vibrating earth formations E21B43/003)} · CPC title

• C09K8/528

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

• C09K8/74 Primary

  combined with additives added for specific purposes · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title