Well corrosion control

Patent metadata

Field	Value
Publication number	US-11866640-B2
Application number	US-202217704809-A
Country	US
Kind code	B2
Filing date	Mar 25, 2022
Priority date	Mar 25, 2022
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A method and system for corrosion control and scale control in water supply for injection, including specifying a corrosion inhibitor for squeeze treatment of a water supply well, specifying a scale inhibitor that can form a complex with the corrosion inhibitor, pumping the corrosion inhibitor and the scale inhibitor through a wellbore of the water supply well into an aquifer in a subterranean formation, forming the complex of the corrosion inhibitor and the scale inhibitor, and pumping water from the water supply well to an injection well for injection, the water including the scale inhibitor released from the complex in the aquifer and the corrosion inhibitor released from the complex in the aquifer.

First claim

What is claimed is:

1. A method of corrosion control and scale control in water supply for injection, comprising:
specifying a corrosion inhibitor for squeeze treatment of a water supply well;
specifying a scale inhibitor that can form a complex with the corrosion inhibitor;
pumping the corrosion inhibitor and the scale inhibitor through a wellbore of the water supply well into an aquifer in a subterranean formation;
forming the complex of the corrosion inhibitor and the scale inhibitor; and
pumping water from the water supply well to an injection well for injection, the water comprising the scale inhibitor released from the complex in the aquifer and the corrosion inhibitor released from the complex in the aquifer.

2. The method of claim 1 , wherein pumping the water to the injection well comprises pumping the water via an electrical submersible pump (ESP) disposed in the wellbore of the water supply well.

3. The method of claim 1 , comprising injecting, via a pump disposed at the injection well, the water through a wellbore of the injection well into an oil reservoir in a subterranean formation associated with the injection well.

4. The method of claim 1 , wherein specifying the scale inhibitor comprises evaluating that the scale inhibitor forms the complex with the corrosion inhibitor.

5. The method of claim 1 , wherein the corrosion inhibitor comprises an amine-based corrosion inhibitor.

6. The method of claim 1 , wherein the scale inhibitor comprises an organic phosphate compound or a polymeric compound having a carboxyl group, or a combination thereof.

7. The method of claim 6 , wherein the scale inhibitor comprises the organic phosphate compound, and wherein the organic phosphate compound comprises a phosphonate or a phosphate ester, or a combination thereof.

8. The method of claim 6 , wherein the scale inhibitor comprises the polymeric compound having the carboxyl group, and wherein the polymeric compound comprises a molecular mass less than 5000 atomic mass units (amu).

Assignees

• Saudi Arabian Oil Co

Inventors

• Wang Qiwei
• Al-Ajwad Hassan Ali
• Chen Tao

Classifications

• C09K8/54 Primary

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

• C09K2208/32

  Anticorrosion additives · CPC title

• C09K8/528 Primary

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