CO2 chemical reaction viscosity-increasing type polymer surfactant for gas channeling control during CO2 flooding in offshore heavy oil reservoirs, preparation method therefor and use thereof

Patent metadata

Field	Value
Publication number	US-12410271-B1
Application number	US-202519032730-A
Country	US
Kind code	B1
Filing date	Jan 21, 2025
Priority date	Dec 6, 2024
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

The present disclosure relates to the technical field of oilfield chemistry, and discloses a CO 2 chemical reaction viscosity-increasing type polymer surfactant for gas channeling control during CO 2 flooding in offshore heavy oil reservoirs, a preparation method therefor and use thereof, the CO 2 reactive viscosity-increasing polymer surfactant includes structural units represented by formula (1), formula (2) and a formula (3) respectively; R 1 , R 2 , R 3 , R 4 and R 5 in formula (1) are respectively one or more of H, F, C 1 -C 4 alkyl alcohol, and at least one group is F; R 6 , R 7 and R 8 in formula (2) are respectively one or more of H, C 1 -C 4 alkyl; R in formula (3) is one or more of C 10 -C 16 alkyl; the CO 2 reactive viscosity-increasing polymer surfactant has a high CO 2 gas channeling plugging strength, excellent chemical stability, and desirable heavy oil viscosity reduction performance;

First claim

The invention claimed is:

1. A CO 2 reactive viscosity-increasing polymer surfactant, wherein the CO 2 reactive viscosity-increasing polymer surfactant comprises structural units provided by a Lewis acid monomer represented by formula (1), structural units provided by a Lewis base monomer represented by formula (2), structural units provided by a hydrophilic monomer, and structural units provided by an interfacially active monomer represented by formula (3);

wherein R 1 , R 2 , R 3 , R 4 and R 5 in formula (1) are the same or different, each is one or more of H, F, C 1 -C 4 alkyl alcohol, and at least one group is F;

wherein R 6 , R 7 and R 8 in formula (2) are the same or different, each is one or more of H, C 1 -C 4 alkyl;

wherein R in formula (3) is one or more of C 10 -C 16 alkyl.

2. The CO 2 reactive viscosity-increasing polymer surfactant of claim 1 , wherein R 1 , R 2 , R 3 , R 4 and R 5 in formula (1) are the same or different, each is one or more of H, F, C 1 -C 3 alkyl alcohol, and at least one group is F.

3. The CO 2 reactive viscosity-increasing polymer surfactant of claim 2 , wherein the Lewis acid monomer is selected from one or more Lewis acid monomers represented by formula (1-1), formula (1-2), formula (1-3), formula (1-4), and formula (1-5);

4. The CO 2 reactive viscosity-increasing polymer surfactant of claim 3 , wherein the Lewis acid monomer is one or more selected from the group consisting of bis(pentafluorophenyl) (4-ethenylphenyl) borane, bis(3,5-difluorophenyl) (4-ethenylphenyl) borane, and bis(3,4,5-trifluorophenyl) (4-ethenylphenyl) borane.

5. The CO 2 reactive viscosity-increasing polymer surfactant of claim 1 , wherein R 6 , R 7 and R 8 in formula (2) are the same or different, each is one or more of H, C 1 -C 3 alkyl.

6. The CO 2 reactive viscosity-increasing polymer surfactant of claim 5 , wherein the Lewis base monomer is selected from one or more Lewis base monomers represented by formula (2-1), formula (2-2), formula (2-3), formula (2-4), and formula (2-5);

7. The CO 2 reactive viscosity-increasing polymer surfactant of claim 6 , wherein the Lewis base monomer is one or more selected from the group consisting of bis(2,4,6-trimethylphenyl) (4-ethenylphenyl) phosphane, bis(2,4,6-triethylphenyl) (4-ethenylphenyl) phosphane, and bis(2,4,6-triisopropylphenyl) (4-ethenylphenyl) phosphane.

8. The CO 2 reactive viscosity-increasing polymer surfactant of claim 1 , wherein the Lewis acid monomer has a purity within the range of 82-98%; the Lewis base monomer has a purity within the range of 80-99%.

9. The CO 2 reactive viscosity-increasing polymer surfactant of claim 8 , wherein the Lewis acid monomer has a purity within the range of 82.06-97.88%; the Lewis base monomer has a purity within the range of 80.3-98.82%.

10. The CO 2 reactive viscosity-increasing polymer surfactant of claim 9 , wherein the Lewis acid monomer has a purity within the range of 90-98%;
the Lewis base monomer has a purity within the range of 92.38-98.82%.

11. The CO 2 reactive viscosity-increasing polymer surfactant of claim 1 , wherein the hydrophilic monomer is one or more selected from the group consisting of acrylamide, N-vinylamide, acrylic acid and methacrylic acid;
R in formula (3) is one or more of C 10 -C 16 alkyl.

12. The CO 2 reactive viscosity-increasing polymer surfactant of claim 1 , wherein the molar ratio of structural units provided by the Lewis acid monomer represented by formula (1), structural units provided by the Lewis base monomer represented by formula (2), structural units provided by the hydrophilic monomer, and structural units provided by the interfacially active monomer represented by formula (3) is 1:(0.4-2.5):(10-100):(0.5-10); the CO 2 reactive viscosity-increasing polymer surfactant has a number average molecular weight within the range of 100,000-2,000,000 g/mol, measured by Gel Permeation Chromatography (GPC).

13. The CO 2 reactive viscosity-increasing polymer surfactant of claim 12 , wherein the molar ratio of structural units provided by the Lewis acid monomer represented by formula (1), structural units provided by the Lewis base monomer represented by formula (2), structural units provided by the hydrophilic monomer, and structural units provided by the interfacially active monomer represented by formula (3) is 1:(0.5-2):(25-80):(0.7-6); the CO 2 reactive viscosity-increasing polymer surfactant has a number average molecular weight within the range of 500,000-1,500,000 g/mol, measured by Gel Permeation Chromatography (GPC).

14. The CO 2 reactive viscosity-increasing polymer surfactant of claim 13 , wherein the molar ratio of structural units provided by the Lewis acid monomer represented by formula (1), structural units provided by the Lewis base monomer represented by formula (2), structural units provided by the hydrophilic monomer, and structural units provided by the interfacially active monomer represented by formula (3) is 1:(0.7-1.5):(30-70):(1-4); the CO 2 reactive viscosity-increasing polymer surfactant has a number average molecular weight within the range of 800,000-1,200,000 g/mol, measured by Gel Permeation Chromatography (GPC).

15. The CO 2 reactive viscosity-increasing polymer surfactant of claim 14 , wherein the molar ratio of structural units provided by the Lewis acid monomer represented by formula (1), structural units provided by the Lewis base monomer represented by formula (2), structural units provided by the hydrophilic monomer, and structural units provided by the interfacially active monomer represented by formula (3) is 1:(0.8-1.3):(40-60):(1.5-3); the CO 2 reactive viscosity-increasing polymer surfactant has a number average molecular weight within the range of 900,000-1,100,000 g/mol, measured by Gel Permeation Chromatography (GPC).

16. A method for preparing the CO 2 reactive viscosity-increasing polymer surfactant of claim 1 , wherein the method comprising:
(F1) blending a Lewis acid monomer represented by formula (1), a Lewis base monomer represented by formula (2), a hydrophilic monomer, and an interfacially active monomer represented by formula (3) with a solvent to obtain a mixture;
(F2) contacting the mixture with an initiator under the protection of an inert gas to carry out reaction;
(F3) contacting the reaction product obtained from step (F2) with an alcohol solvent, and subjecting to precipitation, filtration and drying treatment to prepare a CO 2 reactive viscosity-increasing polymer surfactant;

wherein R 1 , R 2 , R 3 , R 4 and R 5 in formula (1) are the same or different, each is one or more of H, F, C 1 -C 4 alkyl alcohol, and at least one group is F;

wherein R 6 , R 7 and R 8 in formula (2) are the same or different, each is one or more of H, C 1 -C 4 alkyl;

Assignees

• Univ China Petroleum East China
• Qingdao Univ Of Science And Technology
• Univ Sichuan

Inventors

• Zhao Guang
• Chen Jia
• Dai Caili
• Cheng Haoran
• Yan Bin
• Ren Hao
• Zheng Yong
• Zhao Lianming
• Yang Qin
• Geng Wanlei
• Liu Qingfeng

Classifications

• C08F220/54

  Amides {, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide} · CPC title

• C08F220/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08F220/56 Primary

  Acrylamide; Methacrylamide · CPC title

• C08F2800/10

  as molar percentages · CPC title

• C09K8/588

  characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} · CPC title