High-temperature-resistant high-salinity corrosion inhibitor as well as preparation method and application thereof
Through daily ammonium salt and sulfonate, a corrosion agent that shows good corrosion performance in high temperature and high -mineralized environment, solve the poor corrosion performance in these environments The problem extended the service life of oil well equipment.
Patent Information
- Application Number
- CN202411521693.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-01-24
AI Technical Summary
The corrosion inhibiting performance of existing corrosion inhibitors still needs to be improved in high temperature and high mineralization environments, and it is difficult to effectively prevent corrosion of oil well equipment.
Using a compound of quaternary ammonium salts and sulfonates, specifically using sulfonates containing sulfone groups and hydrophobic groups and cetyltrimethylammonium chloride as quaternary ammonium salts, and adjusting their mass ratio to form a resistant High temperature and high salinity corrosion inhibitor.
In high-temperature and high-salinity environments, the proposed corrosion inhibitor showed good corrosion inhibition performance, with an average corrosion inhibition rate of more than 77.8%, extending the service life of oil well equipment and effectively preventing corrosion.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of corrosion inhibitors, and in particular to a high-temperature resistant high-mineralization corrosion inhibitor and a preparation method and application thereof. Background Art
[0002] During the oil well exploitation process, the underground environment is often in a state of high temperature and high mineralization, which makes oil and gas production wells, gathering and transportation pipelines prone to corrosion, thus causing economic losses and safety risks. High temperature resistant and high mineralization corrosion inhibitors can play a good role in the corrosion of oil well equipment under high temperature and high mineralization environments, thereby extending the service life of oil well equipment, which is of great significance in the field of oilfield pipeline anti-corrosion technology.
[0003] High temperature resistant and high mineralization corrosion inhibitors not only need to have stable molecular structure and good corrosion inhibition performance under high temperature, but also need to have the ability to resist ion interference under high mineralization environment, so as to achieve good anti-corrosion effect under high temperature and high mineralization. The corrosion inhibition performance of existing corrosion inhibitors on the market still needs to be further improved under high temperature and high mineralization environment. Summary of the invention
[0004] The present invention provides a high temperature resistant high mineralization corrosion inhibitor and a preparation method and application thereof, which solves the problem that the corrosion inhibitor in the related art has poor corrosion inhibition performance under high temperature and high mineralization environment.
[0005] The technical solution of the present invention is as follows: A high-temperature resistant and high-mineralization corrosion inhibitor, wherein the raw materials include component A, wherein the component A includes a quaternary ammonium salt and a sulfonate in a mass ratio of 1:9 to 9:1.
[0006] As a further technical solution, the sulfonate is a sulfonate containing a sulfone group and a hydrophobic group.
[0007] The sulfonate in the present invention can be any sulfonate containing a sulfone group and a hydrophobic group, wherein the sulfone group provides thermal stability for the corrosion inhibitor, and the sulfone group and the sulfonic acid group as metal-philic polar groups cooperate with the hydrophobic group to form a shielding layer on the metal surface, thereby protecting the metal.
[0008] As a further technical solution, the sulfonate is 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt.
[0009] In the present invention, 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt is used as the sulfonate, which further improves the corrosion inhibition performance of the corrosion inhibitor in a high temperature and high mineralization environment.
[0010] As a further technical solution, the mass ratio of the quaternary ammonium salt to the sulfonate is 3:1-2.
[0011] The present invention limits the mass ratio of the quaternary ammonium salt to the sulfonate to 3:1-2, thereby further improving the corrosion inhibition performance of the corrosion inhibitor in an environment of high temperature and high mineralization.
[0012] As a further technical solution, the quaternary ammonium salt includes one or more of dodecyl hexadecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, hexadecyltrimethylammonium chloride, and octadecyltrimethylammonium chloride.
[0013] As a further technical solution, the quaternary ammonium salt is hexadecyltrimethylammonium chloride.
[0014] The invention uses hexadecyltrimethylammonium chloride as a quaternary ammonium salt in combination with a sulfonate, thereby further improving the corrosion inhibition performance of the corrosion inhibitor in an environment of high temperature and high mineralization.
[0015] As a further technical solution, the raw materials also include component B, component C and component D, wherein component B includes alkylphenol polyoxyethylene ether, thiourea and benzotriazole, component C includes imidazoline polyoxyethylene ether, hexamethylenetetramine and water, and component D includes water.
[0016] As a further technical solution, the mass ratio of alkylphenol polyoxyethylene ether, thiourea and benzotriazole in component B is 11:5:4~6:3:1, the mass ratio of imidazoline polyoxyethylene ether, hexamethylenetetramine and water in component C is 1:1:8~3:3:14, and the mass ratio of component A, component B, component C and component D is 1:4:3:2~8:50:25:17.
[0017] The present invention also proposes a method for preparing the high temperature resistant high mineralization corrosion inhibitor, comprising the following steps: S1, using quaternary ammonium salt and sulfonate as component A; S2, mixing alkylphenol polyoxyethylene ether, thiourea and benzotriazole uniformly to obtain component B; S3, mixing imidazoline polyoxyethylene ether, hexamethylenetetramine and water uniformly to obtain component C; S4. After the component A and the component D are evenly mixed, the component B and the component C are added and continued to be mixed to obtain a high temperature resistant and high mineralization corrosion inhibitor.
[0018] The present invention also proposes the use of the high temperature resistant high mineralization corrosion inhibitor or the high temperature resistant high mineralization corrosion inhibitor prepared by the preparation method in corrosion protection or oil production.
[0019] The working principle and beneficial effects of the present invention are: The present invention provides a high temperature resistant high mineralization corrosion inhibitor by compounding quaternary ammonium salt and sulfonate. Compared with traditional corrosion inhibitors, the corrosion inhibitor provided by the present invention still has good corrosion inhibition performance under high temperature and high mineralization, is more in line with the market demand for corrosion inhibition performance of corrosion inhibitors under high temperature and high mineralization, and is more conducive to oil production. DETAILED DESCRIPTION
[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] The parameters of the raw materials in the following examples and comparative examples are as follows: The alkylphenol polyoxyethylene ether is alkylphenol polyoxyethylene ether TX-4; The imidazoline polyoxyethylene ether is imidazoline polyoxyethylene ether RX-406.
[0022] Example 1 S1, after mixing 60 parts of alkylphenol polyoxyethylene ether, 30 parts of thiourea and 10 parts of benzotriazole, stirring evenly at 25° C., obtain component B; S2, after mixing 15 parts of imidazoline polyoxyethylene ether, 15 parts of hexamethylenetetramine and 70 parts of water, stir evenly at 25° C. to obtain component C; S3. Mix 1 part of hexadecyltrimethylammonium chloride, 9 parts of sodium dodecylbenzenesulfonate and 20 parts of water, stir evenly at 25° C., add 40 parts of component B and 30 parts of component C, and continue stirring and mixing until evenly mixed to obtain a high temperature resistant and high mineralization corrosion inhibitor.
[0023] Example 2 S1. Mix 55 parts of alkylphenol polyoxyethylene ether, 25 parts of thiourea and 20 parts of benzotriazole, and stir evenly at 25° C. to obtain component B; S2, after mixing 10 parts of imidazoline polyoxyethylene ether, 10 parts of hexamethylenetetramine and 80 parts of water, stirring evenly at 25° C., obtaining component C; S3. Mix 0.8 parts of hexadecyltrimethylammonium chloride, 7.2 parts of sodium dodecylbenzenesulfonate and 17 parts of water, stir evenly at 25° C., add 50 parts of component B and 25 parts of component C, and continue stirring and mixing until uniform, to obtain a high temperature resistant and high mineralization corrosion inhibitor.
[0024] Example 3 The only difference from Example 1 is that sodium dodecylbenzenesulfonate is replaced by an equal amount of 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt.
[0025] Example 4 The only difference from Example 3 is: 7.5 parts of dodecyl hexadecyltrimethylammonium chloride and 2.5 parts of 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt.
[0026] Example 5 The only difference from Example 3 is: 6 parts of dodecyl hexadecyltrimethylammonium chloride and 4 parts of 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt.
[0027] Example 6 The only difference from Example 3 is: 9 parts of dodecyl hexadecyltrimethylammonium chloride and 1 part of 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt.
[0028] Example 7 The only difference from Example 5 is that the dodecyl hexadecyltrimethylammonium chloride is replaced by an equal amount of dodecyldimethylbenzylammonium chloride.
[0029] Example 8 The only difference from Example 5 is that the dodecane hexadecyltrimethylammonium chloride is replaced by an equal amount of hexadecyltrimethylammonium chloride.
[0030] Example 9 The only difference from Example 5 is that the dodecane hexadecyltrimethylammonium chloride is replaced by an equal amount of octadecyltrimethylammonium chloride.
[0031] Comparative Example 1 S1, after mixing 60 parts of alkylphenol polyoxyethylene ether, 30 parts of thiourea and 10 parts of benzotriazole, stirring evenly at 25° C., obtain component B; S2, after mixing 15 parts of imidazoline polyoxyethylene ether, 15 parts of hexamethylenetetramine and 70 parts of water, stir evenly at 25° C. to obtain component C; S3. After mixing 10 parts of dodecyl hexadecyltrimethylammonium chloride and 20 parts of water, stir evenly at 25° C., add 40 parts of component B and 30 parts of component C and continue stirring and mixing until evenly mixed, to obtain a high temperature resistant and high mineralization corrosion inhibitor.
[0032] After adding water to the high temperature resistant and high mineralization corrosion inhibitors obtained in Examples 1 to 9 and Comparative Example 1 to prepare a corrosion inhibitor solution with a mass concentration of 1%, the uniform corrosion inhibition rate was tested for 10 days at a temperature of 80°C and a mineralization of 25765 mg / L, with reference to the static uniform corrosion inhibition rate determination method in SY / T 5273-2014 "Performance Indicators and Evaluation Methods for Corrosion Inhibitors for Oilfield Produced Water Treatment". The test results are recorded in Table 1.
[0033] Table 1 Corrosion inhibition performance of corrosion inhibitors under high temperature and high mineralization environment
[0034] It can be seen from Table 1 that the corrosion inhibitor provided by the present invention has a uniform corrosion inhibition rate of more than 77.8% for 10 days under an environment of temperature of 80°C and salinity of 25765 mg / L, and has good corrosion inhibition performance under high temperature and high salinity environment.
[0035] Compared with Comparative Example 1, Example 1 adds quaternary ammonium salt and sulfonate, and Comparative Example 1 adds quaternary ammonium salt. The corrosion inhibitor obtained in Example 1 has a higher uniform corrosion inhibition rate under high temperature and high mineralization environment than Comparative Example 1, indicating that the compound use of quaternary ammonium salt and sulfonate can improve the corrosion inhibition performance of the corrosion inhibitor under high temperature and high mineralization.
[0036] The corrosion inhibition rate of the corrosion inhibitor obtained in Example 3 under high temperature and high mineralization environment is higher than that in Example 1, indicating that the use of 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt as sulfonate can further improve the corrosion inhibition performance of the corrosion inhibitor under high temperature and high mineralization environment.
[0037] The corrosion inhibition rate of the corrosion inhibitor obtained in Examples 4 to 5 under high temperature and high mineralization environment is higher than that in Examples 3 and 6, indicating that the mass ratio of quaternary ammonium salt to sulfonate is 3:1 to 2, which can further improve the corrosion inhibition performance of the corrosion inhibitor under high temperature and high mineralization environment.
[0038] The corrosion inhibition rate of the corrosion inhibitor obtained in Example 8 under high temperature and high mineralization environment is higher than that in Example 5 and Example 9, indicating that hexadecyltrimethylammonium chloride, as a quaternary ammonium salt, is used in combination with sulfonate to further improve the corrosion inhibition performance of the corrosion inhibitor under high temperature and high mineralization environment.
[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A high temperature resistant and high mineralization corrosion inhibitor, characterized in that: The raw materials include component A, and the component A includes a quaternary ammonium salt and a sulfonate in a mass ratio of 1:9 to 9:
1.
2. A high temperature resistant and high mineralization corrosion inhibitor according to claim 1, characterized in that: The sulfonate is a sulfonate containing a sulfone group and a hydrophobic group.
3. A high temperature resistant and high mineralization corrosion inhibitor according to claim 2, characterized in that: The sulfonate is 3,3'-disulfonic acid-4,4'-difluorophenyl sulfone disodium salt.
4. A high temperature resistant and high mineralization corrosion inhibitor according to claim 3, characterized in that: The mass ratio of the quaternary ammonium salt to the sulfonate is 3:1-2.
5. A high temperature resistant and high mineralization corrosion inhibitor according to claim 1, characterized in that: The quaternary ammonium salt includes one or more of dodecyl hexadecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, hexadecyltrimethylammonium chloride, and octadecyltrimethylammonium chloride.
6. A high temperature resistant and high mineralization corrosion inhibitor according to claim 5, characterized in that: The quaternary ammonium salt is hexadecyltrimethylammonium chloride.
7. The high temperature resistant and high mineralization corrosion inhibitor according to claim 1, characterized in that: The raw materials further include component B, component C and component D. Component B includes alkylphenol polyoxyethylene ether, thiourea and benzotriazole, component C includes imidazoline polyoxyethylene ether, hexamethylenetetramine and water, and component D includes water.
8. A high temperature resistant and high mineralization corrosion inhibitor according to claim 7, characterized in that: The mass ratio of alkylphenol polyoxyethylene ether, thiourea and benzotriazole in the component B is 11:5:4-6:3:1, the mass ratio of imidazoline polyoxyethylene ether, hexamethylenetetramine and water in the component C is 1:1:8-3:3:14, and the mass ratio of the component A, component B, component C and component D is 1:4:3:2-8:50:25:
17.
9. The method for preparing a high temperature resistant and high mineralization corrosion inhibitor according to claim 8, characterized in that: The following steps are involved: S1, using quaternary ammonium salt and sulfonate as component A; S2, mixing alkylphenol polyoxyethylene ether, thiourea and benzotriazole uniformly to obtain component B; S3, mixing imidazoline polyoxyethylene ether, hexamethylenetetramine and water uniformly to obtain component C; S4. After the component A and the component D are evenly mixed, the component B and the component C are added and continued to be mixed to obtain a high temperature resistant and high mineralization corrosion inhibitor.
10. Use of the high temperature resistant and high mineralization corrosion inhibitor according to any one of claims 1 to 8 or the high temperature resistant and high mineralization corrosion inhibitor prepared by the preparation method according to claim 9 in corrosion protection or oil production.