# US 12,595,405 B2 · Methods for acidizing subsurface formations utilizing corrosion inhibitor compounds

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- Number: US 12,595,405 B2
- Document ID: US12595405B2
- Status: Granted
- Kind: B2
- Application number: 18/488,660
- Filed: 2023-10-17
- Published: 2025-04-17
- Granted: 2026-04-07
- Earliest claimed: 2023-10-17
- Assignees: Saudi Arabian Oil Company
- Applicants: Saudi Arabian Oil Company
- Inventors: Abdullah S. Alenezi; Reem A. Alalwan; Muhammad Imran Ul-haq; Nayef M. Alanazi; Rashed Mohammad Aleisa
- Web page: https://patentgrep.com/patent/US12595405B2

## CPC

- C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells
- C09K 8/74: combined with additives added for specific purposes
- C09K 2208/32: Anticorrosion additives
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A subsurface formation may be acidized by a method that may comprise injecting an acidic treatment fluid into an subsurface formation through a tubing of an extraction well, thereby exposing at least a portion of the tubing to an acidic environment. At least a portion of the tubing may be contacted by a corrosion inhibitor compound that may have the general structure as described herein.

## Claims

### Claim 1

A method of acidizing a subsurface formation, the method comprising:
injecting an acidic treatment fluid into a subsurface formation through a tubing of an extraction well, thereby exposing at least a portion of the tubing to an acidic environment;
wherein at least a portion of the tubing is contacted by a corrosion inhibitor compound having the general structure:
wherein:
R1 is a C1-C18 alkyl group, a C1-C18 hydroxyl alkyl group, a C1-C18 alkenyl group, a C1-C18 internal alkynl group, a C1-C18 acryl group, a C1-C18 cycloalkyl group, or a C1-C18 functional alkyl group; and
RA, RB, RC, RD, and RE are each independently chosen from hydrogen, a C1-C18 alkyl group, a C1-C18 hydroxyl alkyl group, a C1-C18 alkenyl group, a C1-C18 alkynl group, a C1-C18 acryl group, a C1-C18 cycloalkyl group, or a C1-C18 functional alkyl group.

### Claim 2 (depends on 1)

The method of claim 1, wherein RA, RB, RC, RD, and RE are each hydrogen.

### Claim 3 (depends on 1)

The method of claim 1, wherein R1 is a C1-C18 alkyl group.

### Claim 4 (depends on 1)

The method of claim 1, wherein the tubing is a metal material.

### Claim 5 (depends on 1)

The method of claim 1, wherein the tubing is carbon steel.

### Claim 6 (depends on 1)

The method of claim 1, wherein the acidic treatment fluid comprises one or more acids chosen from hydrochloric acid, formic acid, acetic acid hydrofluoric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, or chloric acid, or combinations thereof.

### Claim 7 (depends on 1)

The method of claim 1, wherein the acidic environment to which at a portion of the tubing is exposed has a pH of less than or equal to 6.

### Claim 8 (depends on 1)

The method of claim 1, wherein the acidic environment to which at least a portion of the tubing is exposed has a temperature of at least 50° C.

### Claim 9 (depends on 1)

The method of claim 1, wherein the acidic environment to which at a portion of the tubing is exposed has a pressure of at least 250 psi.

### Claim 10 (depends on 1)

The method of claim 1, wherein the acidic treatment fluid comprises the corrosion inhibitor compound.

### Claim 11

A method of acidizing a subsurface formation, the method comprising:
injecting an acidic treatment fluid into a subsurface formation through a tubing of an extraction well, thereby exposing the tubing to an acidic environment;
wherein at least a portion of the tubing is contacted by a corrosion inhibitor compound having the general structure:
wherein:
R1 is a C1-C18 alkyl group, a C1-C18 hydroxyl alkyl group, a C1-C18 alkenyl group, a C1-C18 internal alkynl group, a C1-C18 acryl group, a C1-C18 cycloalkyl group, or a C1-C18 functional alkyl group; and
RA, RB, RC, RD, and RE are each independently chosen from hydrogen, a C1-C18 alkyl group, a C1-C18 hydroxyl alkyl group, a C1-C18 alkenyl group, a C1-C18 alkynl group, a C1-C18 acryl group, a C1-C18 cycloalkyl group, or a C1-C18 functional alkyl group.

### Claim 12 (depends on 11)

The method of claim 11, wherein RA, RB, RC, RD, and RE are each hydrogen.

### Claim 13 (depends on 11)

The method of claim 11, wherein R1 is a C1-C18 alkyl group.

### Claim 14 (depends on 11)

The method of claim 11, wherein the tubing is a metal material.

### Claim 15 (depends on 11)

The method of claim 11, wherein the tubing is carbon steel.

### Claim 16 (depends on 11)

The method of claim 11, wherein the acidic treatment fluid comprises one or more acids chosen from hydrochloric acid, formic acid, acetic acid hydrofluoric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, or chloric acid, or combinations thereof.

### Claim 17 (depends on 11)

The method of claim 11, wherein the acidic environment to which at least a portion of the tubing is exposed has a pH of less than or equal to 6.

### Claim 18 (depends on 11)

The method of claim 11, wherein the acidic environment to which at a portion of the tubing is exposed has a temperature of at least 50° C.

### Claim 19 (depends on 11)

The method of claim 11, wherein the acidic environment to which at a portion of the tubing is exposed has a pressure of at least 250 psi.

### Claim 20

A method of acidizing a subsurface formation, the method comprising:
injecting an acidic treatment fluid into a subsurface formation through a tubing of an extraction well, thereby exposing at least a portion of the tubing to an acidic environment;
wherein at least a portion of the tubing is contacted by a corrosion inhibitor compound having the general structure:
wherein:
R1 is a C1-C18 alkyl group; and
RA, RB, RC, RD, and RE are each hydrogen.