Non-regulated synthetic acid compositions for use as alternatives to conventional acids in the oil and gas industry

Patent metadata

Field	Value
Publication number	US-10329476-B2
Application number	US-201615160467-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 28, 2015
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A synthetic acid composition for use in oil industry activities comprising urea and methanesulphonic acid in a molar ratio of not loss than 1.0:1, a metal iodide or iodate and an alcohol or derivative thereof.

First claim

The invention claimed is:

1. A synthetic acid composition for use in oil industry activities, said composition comprising:
water, urea and methanesulphonic acid, wherein no less than 97% of the weight of the composition is comprised of the water, the urea and the methanesulphonic acid and the urea and the methanesulphonic acid have a molar ratio of not less than 1.0:1;
a metal iodide or iodate in an amount of no more than 1% by weight of the weight of the composition; and
a corrosion inhibitor, wherein said corrosion inhibitor comprises—an alcohol or derivative thereof in an amount of no more than 1% by weight of the weight of the composition,
wherein the synthetic acid composition has a pH less than 1.0 and a shelf life of greater than 12 months.

2. The synthetic acid composition according to claim 1 , wherein the urea and the methanesulphonic acid are in a molar ratio of 1.2:1.

3. 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.

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

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

6. The synthetic acid composition according to claim 5 , wherein the alkynyl alcohol or derivative thereof is propargyl alcohol or a derivative thereof.

7. The synthetic acid composition according to claim 6 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 1.0% w/w.

8. The synthetic acid composition according to claim 5 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 0.5% w/w.

9. The synthetic acid composition according to claim 5 , wherein the alkynyl alcohol or derivative thereof is present in a concentration of 0.2% w/w.

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

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

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

13. The synthetic acid composition according to claim 1 , wherein no less than 98.9% of the weight of the composition is comprised of the water, the urea and the methanesulphonic acid.

14. The synthetic acid composition according to claim 13 for use in solubilizing CaCO 3 from rock formations.

Assignees

• Fluid Energy Group Ltd

Inventors

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

Classifications

• E21B43/25

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

• C09K2208/32

  Anticorrosion additives · CPC title

• E21B43/26

  by forming crevices or fractures · CPC title

• C23F11/04

  in markedly acid liquids · CPC title

• E21B37/06

  using chemical means for preventing or limiting {, e.g. eliminating,} the deposition of paraffins or like substances · CPC title