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

Patent metadata

Field	Value
Publication number	US-10190039-B2
Application number	US-201515512478-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Oct 2, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A synthetic acid composition for use in oil industry activities is disclosed. The composition in a preferred embodiment comprises urea and hydrogen chloride in a molar ratio of not less than 0.1:1; and a metal iodide or iodate. Optionally, a phosphonic acid derivative may be added to the composition.

First claim

The invention 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; and
a metal iodide or iodate.

2. 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.

3. The synthetic acid composition according to claim 2 , wherein the urea and hydrogen chloride are in a molar ratio of not less than 1.0:1.

4. The synthetic acid composition according to claim 1 , further including aminoalkylphosphonic salt.

5. The synthetic acid composition according to claim 4 , wherein the aminoalkylphosphonic salt is amino tris methylene phosphonic acid.

6. The synthetic acid composition according to claim 4 , wherein the aminoalkylphosphonic salt is present in a concentration ranging from 0.25 to 1.0% w/w.

7. The synthetic acid composition according to claim 6 , wherein the aminoalkylphosphonic salt is present in a concentration of 0.5% w/w.

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

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

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

11. The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 1000 ppm.

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

13. The use of a synthetic acid composition 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; and
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 & 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.

14. The synthetic acid composition according to claim 13 , further comprising:
a phosphonic acid derivative.

Assignees

• Fluid Energy Group Ltd

Inventors

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

Classifications

• E21B37/06

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

• C09K8/54

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

• C09K8/62

  Compositions for forming crevices or fractures · CPC title

• C09K8/528

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

• C09K8/52

  Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning · CPC title