Petroleum corrosion inhibitor and preparation method thereof

Abstract

The invention relates to the technical field of oil and gas well reservoir transformation, and provides a petroleum corrosion inhibitor and a preparation method thereof.The petroleum corrosion inhibitor comprises a microcapsule corrosion inhibitor composed of a modified metal organic compound framework and a corrosion inhibitor; wherein the modified metal organic compound skeleton contains a metal salt and an organic ligand in a content mass ratio of (1-10): 1, and the average pore size of the modified metal organic compound skeleton is 50-300nm; the corrosion inhibitor is prepared from the following components in parts by mass: 10 to 20 parts of zinc petroleum acid, 20 to 30 parts of 5-sulfydryl-1-tetrazole sodium acetate, 10 to 20 parts of 5-iodouracil, 4 to 6 parts of a surfactant, 1 to 5 parts of nano zinc chloride and 30 to 40 parts of a solvent. The corrosion inhibitor provided by the invention can solve the problem of corrosion of a water-phase region in a petroleum delivery pipeline caused by H2S / CO2 corrosion, can also solve the problem of corrosion of a common acidic material to the pipeline, especially the problem of corrosion at an oil-water interface, and can be applied to pipelines in a ground gathering and transportation system, oilfield sewage pipelines and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of reservoir stimulation in oil and gas wells, and particularly relates to an oil corrosion inhibitor and a preparation method thereof. Background Art

[0002] With the substantial increase in sulfur content during crude oil transportation in China, the failure problems such as pitting, grooving, delamination, and even perforation on the surface of oil pipelines caused by hydrogen sulfide and carbon dioxide corrosion cannot be ignored. Especially in the middle and late stages of oilfield exploitation, with the continuous increase in water cut, the corrosion of oil pipelines caused by H2S / CO2 continues to intensify.

[0003] Injecting corrosion inhibitor into the surface gathering and transportation system is currently one of the main ways to effectively solve the corrosion of oil pipelines. The corrosion inhibitor is compounded by a main agent and an auxiliary agent (also known as a complex). Among them, the main agent is the main corrosion-inhibiting component of the corrosion inhibitor, generally chain organic amines and their derivatives, imidazolines and their salts, quaternary ammonium salts, rosin derivatives, sulfonates, iminoacetic acid derivatives, and alkynols, etc. In order to solve the failure problems such as perforation caused by pipeline corrosion, especially for H2S / CO2 corrosion, a large number of corrosion inhibitor component schemes have been proposed.

[0004] Although the current corrosion inhibitors have good corrosion inhibition effects on H2S / CO2 corrosion, they mainly target the corrosion occurring in the area where the inner wall of the oil pipeline contacts the water phase and do not have good protection effects at the oil-water interface. Therefore, there is no relevant report on corrosion inhibitors specifically for the oil-water interface of the surface gathering and transportation system at home and abroad. Summary of the Invention

[0005] Based on this, the present invention provides an oil corrosion inhibitor and a preparation method thereof, which can be used for protecting oil pipelines at the water-oil interface, and has a slow-release effect and an H2S adsorption function, and has a good protection effect.

[0006] According to the first aspect of the present invention, there is provided an oil corrosion inhibitor, including a microcapsule corrosion inhibitor composed of a modified metal-organic compound framework and a corrosion inhibitor;

[0007] Wherein, the modified metal-organic compound framework contains a metal salt and an organic ligand with a mass ratio of 1-10:1, and the average pore diameter of the modified metal-organic compound framework is 50-300 nm;

[0008] The corrosion inhibitor includes, by mass: 10-20 parts of zinc petroleum sulfonate, 20-30 parts of 5-mercapto-1-tetrazoleacetic acid sodium, 10-20 parts of 5-iodouracil, 4-6 parts of surfactant, 1-5 parts of nano zinc chloride, and 30-40 parts of solvent.

[0009] According to an embodiment of the present invention, the metal salt of the MOFs material comprises a zinc ion hydrate compound with a mass fraction of 50-60% and a cobalt ion hydrate compound with a mass fraction of 40-50%.

[0010] According to an embodiment of the present invention, the zinc ion hydrate compound is zinc nitrate hexahydrate; the cobalt ion hydrate compound is cobalt chloride hexahydrate.

[0011] According to an embodiment of the present invention, the organic ligand is at least one of 2-aminoterephthalic acid, 2,6-naphthalenedicarboxylic acid, trimesic acid, biphenyl-3,3',5,5'-tetracarboxylic acid, and terephthalic acid.

[0012] According to an embodiment of the present invention, the surfactant is tetradecylpyridinium bromide or polyethylene glycol octyl phenyl ether.

[0013] According to an embodiment of the present invention, the solvent is a C1-C6 polyol.

[0014] According to a first aspect of the present invention, there is provided a preparation method of a petroleum corrosion inhibitor, comprising the following steps:

[0015] Prepare the modified metal-organic compound framework;

[0016] Prepare the corrosion inhibitor solution;

[0017] Immerse the modified metal-organic compound framework into the corrosion inhibitor solution, so that the corrosion inhibitor solution is adsorbed into the modified metal-organic compound framework to obtain the petroleum corrosion inhibitor.

[0018] According to an embodiment of the present invention, the preparation of the modified metal-organic compound framework comprises:

[0019] Add the metal salt and the organic ligand to N,N-dimethylformamide, pour it into a hydrothermal autoclave, react at 150-170°C for 8-16 h, centrifuge and dry to obtain a metal-organic compound;

[0020] Calcine the metal-organic compound, the calcination temperature is 275-360°C, and the calcination time is 0.1-10 d to obtain the modified metal-organic compound framework.

[0021] According to an embodiment of the present invention, the preparation of the corrosion inhibitor solution comprises:

[0022] Add 10-20 parts of zinc petroleum acid, 20-30 parts of sodium 5-mercapto-1-tetrazole acetate, 10-20 parts of 5-iodouracil, 4-6 parts of surfactant, and 1-5 parts of nano zinc chloride to 30-40 parts of a C1-C6 polyol respectively, and mix to obtain the corrosion inhibitor solution.

[0023] According to an embodiment of the present invention, the step of soaking the modified metal-organic framework into the corrosion inhibitor solution to allow the corrosion inhibitor solution to be adsorbed into the modified metal-organic framework to obtain the petroleum corrosion inhibitor includes:

[0024] Soak the modified metal-organic framework into the corrosion inhibitor solution to obtain a mixture;

[0025] Pressurize the mixture to 100 kPa - 200 kPa and maintain for 8 - 16 h to allow the corrosion inhibitor solution to be adsorbed into the modified metal-organic framework to obtain the petroleum corrosion inhibitor.

[0026] As can be seen from the above technical solutions, the petroleum corrosion inhibitor and its preparation method provided by the present invention have the following beneficial effects:

[0027] The petroleum corrosion inhibitor and its preparation method provided by the present invention overcome the problem that existing corrosion inhibitors have a good slow-release effect. Based on the compounding of N-heterocyclic compounds 5-mercapto-1-tetrazole acetic acid sodium and 5-iodouracil with a large number of N atoms and a large conjugated system in the molecular structure, surfactants cetylpyridinium bromide and OP (polyethylene glycol octyl phenyl ether), as well as nano zinc chloride and zinc petroleum sulfonate are added to assist the corrosion inhibitor to play a synergistic effect.

[0028] The present invention is encapsulated by microcapsule technology to achieve slow release or controlled release in the oilfield environment, thereby improving the efficiency and persistence of the corrosion inhibitor. The microcapsule corrosion inhibitor can prevent the agent from being inactivated in the corrosion environment, improve its effective utilization rate, extend the effective period of the agent, and at the same time improve the stability of the agent and reduce the change in compatibility. Moreover, the MOFs material used in the present invention has a high porosity and specific surface area, an easily adjustable pore size and pore structure, and has a good adsorption capacity for hydrogen sulfide gas, and has a better corrosion inhibition effect.

[0029] The present invention has the advantages of high corrosion inhibition efficiency, obvious synergistic effect, strong adaptability, good aftereffect, etc., and significantly inhibits the corrosion of acid on steel. It can be applied to pickling of steel in inorganic acids and organic acids, and can be used for cleaning of petrochemical equipment, boilers, and pipelines. The corrosion inhibitor of the present invention is convenient to use, safe, simple to operate, and has quick results.

[0030] The corrosion inhibitor provided by the present invention has the advantages of high corrosion inhibition efficiency, good dispersion at the oil-water interface, and a uniform and dense corrosion inhibitor film. It can solve the corrosion problem in the aqueous phase region of petroleum pipelines caused by H2S / CO2 corrosion, and can also solve the corrosion problem of pipelines by ordinary acidic substances, especially the corrosion problem at the oil-water interface. It can be applied to pipelines in the surface gathering and transportation system and oilfield sewage pipelines, etc. Detailed Embodiments

[0031] To make the objectives, technical solutions and advantages of the present invention more clearly understood, the following provides a further detailed description of the present invention in conjunction with specific embodiments.

[0032] Although current corrosion inhibitors have good corrosion inhibition effects on H2S / CO2 corrosion, they mainly target the corrosion occurring in the area where the inner wall of the oil pipeline contacts the water phase and do not have good protective effects at the oil-water interface. Therefore, there are no relevant reports on corrosion inhibitors specifically for the oil-water interface of the surface gathering and transportation system at home and abroad. Thus, there is a need to provide a corrosion inhibitor that has good protective effects at the oil-water interface and also has good corrosion inhibition effects.

[0033] According to a first aspect of the present invention, there is provided an oil corrosion inhibitor, including a microcapsule corrosion inhibitor composed of a modified metal-organic compound skeleton and a corrosion inhibitor;

[0034] Among them, the modified metal-organic compound skeleton contains a metal salt and an organic ligand with a mass ratio of 1-10:1, and the average pore size of the modified metal-organic compound skeleton is 50-300 nm;

[0035] The corrosion inhibitor includes, by mass parts: 10-20 parts of zinc petroleum sulfonate, 20-30 parts of 5-mercapto-1-tetrazole acetic acid sodium, 10-20 parts of 5-iodouracil, 4-6 parts of a surfactant, 1-5 parts of nano zinc chloride, and 30-40 parts of a solvent.

[0036] The present invention overcomes the existing corrosion inhibitors with good slow-release effects, and is based on the compounding of N-heterocyclic compounds 5-mercapto-1-tetrazole acetic acid sodium and 5-iodouracil with a large number of N atoms and a large conjugated system in the molecular structure. Surfactants cetylpyridinium bromide and OP (polyethylene glycol octylphenyl ether), as well as nano zinc chloride and zinc petroleum sulfonate, are added to assist the corrosion inhibitor to play a synergistic effect.

[0037] The present invention is encapsulated by microcapsule technology to achieve slow release or controlled release in the oilfield environment, thereby improving the efficiency and persistence of the corrosion inhibitor. The microcapsule corrosion inhibitor can prevent the agent from deactivating in the corrosion environment, improve its effective utilization rate, extend the effective period of the agent, and at the same time improve the stability of the agent and reduce compatibility changes. Moreover, the MOFs material used in the present invention has high porosity and specific surface area, easily adjustable pore size and pore structure, has good adsorption capacity for hydrogen sulfide gas, and has better corrosion inhibition effects.

[0038] The present invention has advantages such as high corrosion inhibition efficiency, obvious synergistic effect, strong adaptability, good aftereffect, etc., and significantly inhibits the corrosion effect of acid on steel. It can be applied to pickling of steel in inorganic acids and organic acids, and can be used for cleaning of petrochemical equipment, boilers, and pipelines. The corrosion inhibitor of the present invention is convenient to use, safe, simple to operate, and quick to take effect.

[0039] The corrosion inhibitor provided by the present invention has the advantages of high corrosion inhibition efficiency, good dispersion at the oil-water interface, and a uniform and dense corrosion inhibitor film. It can solve the corrosion problem in the aqueous phase region of oil pipelines caused by H2S / CO2 corrosion, and can also solve the corrosion problem of pipelines caused by ordinary acidic substances, especially the corrosion problem at the oil-water interface. It can be applied to pipelines in surface gathering and transportation systems, oilfield sewage pipelines, etc.

[0040] According to an embodiment of the present invention, the metal salts of the MOFs material include 50 - 60% by mass of zinc ion hydrated compounds and 40 - 50% by mass of cobalt ion hydrated compounds.

[0041] According to an embodiment of the present invention, the zinc ion hydrated compound is zinc nitrate hexahydrate; the cobalt ion hydrated compound is cobalt chloride hexahydrate.

[0042] Zinc petroleum sulfonate can reduce the corrosion of acid-containing hydrocarbon oils to pipelines.

[0043] Nanomaterials have good physical and chemical properties, which can improve the efficiency and stability of petroleum corrosion inhibitors. At the same time, they can also improve their biodegradability and environmental sustainability. Nano zinc ions can react with acidic substances in petroleum to form a stable protective film, thereby preventing metal equipment and pipelines from being corroded. In addition, nano zinc ions can also promote the action of other components of petroleum corrosion inhibitors, forming better oil film separation, anti-wear and other properties. It can also reduce the occurrence of equipment failures and safety accidents caused by corrosion. When the corrosion inhibitor contains nano zinc ions, even if the corrosion inhibitor fails, it will not form dangerous hydrogen bubbles like traditional materials. And nano zinc ions can penetrate into the tiny pores on the metal surface, thus better protecting metal equipment and pipelines. This can extend the service life of equipment and reduce the frequency of maintenance and replacement.

[0044] According to an embodiment of the present invention, the organic ligand is at least one of 2-aminoterephthalic acid, 2,6-naphthalenedicarboxylic acid, trimesic acid, biphenyl-3,3',5,5'-tetracarboxylic acid, and terephthalic acid.

[0045] According to an embodiment of the present invention, the surfactant is bromotetradecylpyridine or polyoxyethylene octylphenyl ether.

[0046] According to an embodiment of the present invention, the solvent is a C1-C6 polyol.

[0047] According to the first aspect of the present invention, a preparation method of a petroleum corrosion inhibitor is provided, including the following steps:

[0048] Prepare a modified metal-organic compound framework;

[0049] Prepare a corrosion inhibitor solution;

[0050] Soak the modified metal-organic framework into the corrosion inhibitor solution to allow the corrosion inhibitor solution to be adsorbed into the modified metal-organic framework, obtaining a petroleum corrosion inhibitor.

[0051] Microencapsulation technology can effectively improve the stability and corrosion inhibition efficiency of corrosion inhibitors, while reducing the impact on the environment. Microencapsulated corrosion inhibitors achieve sustained or controlled release effects by encapsulating corrosion inhibitors in tiny capsules, thereby enhancing their practicality and long-term effectiveness in oilfield systems.

[0052] Through encapsulation by microencapsulation technology to achieve sustained or controlled release in the oilfield environment, thereby improving the efficiency and durability of corrosion inhibitors. Microencapsulated corrosion inhibitors can prevent the inactivation of the agent in the corrosive environment, improve its effective utilization rate, extend the effective period of the agent, while enhancing the stability of the agent and reducing compatibility changes.

[0053] According to an embodiment of the present invention, preparing a modified metal-organic framework includes:

[0054] Add a metal salt and an organic ligand to N,N-dimethylformamide, pour it into a hydrothermal autoclave and react at 150 - 170 °C for 8 - 16 h, then centrifuge and dry to obtain a metal-organic compound;

[0055] Calcine the metal-organic compound at a temperature of 275 - 360 °C for a time of 0.1 - 10 d to obtain a modified metal-organic framework.

[0056] According to an embodiment of the present invention, preparing a corrosion inhibitor solution includes:

[0057] Add 10 - 20 parts of zinc petroleum sulfonate, 20 - 30 parts of sodium 5-mercapto-1-tetrazole acetate, 10 - 20 parts of 5-iodouracil, 4 - 6 parts of a surfactant, and 1 - 5 parts of nano zinc chloride into 30 - 40 parts of C1 - C6 polyol respectively, and mix to obtain a corrosion inhibitor solution.

[0058] According to an embodiment of the present invention, soaking the modified metal-organic framework into the corrosion inhibitor solution to allow the corrosion inhibitor solution to be adsorbed into the modified metal-organic framework, obtaining a petroleum corrosion inhibitor includes:

[0059] Soak the modified metal-organic framework into the corrosion inhibitor solution to obtain a mixture;

[0060] Pressurize the mixture to 100 kPa - 200 kPa and keep it for 8 - 16 h to allow the corrosion inhibitor solution to be adsorbed into the modified metal-organic framework, obtaining a petroleum corrosion inhibitor.

[0061] The technical solution of the present invention will be described in detail below through preferred embodiments. It should be noted that the specific embodiments below are only for illustration and do not limit the present invention.

[0062] A preparation method of an oil corrosion inhibitor is provided, comprising the following steps:

[0063] Adding a metal salt and an organic ligand into N,N-dimethylformamide, pouring it into a hydrothermal reactor, reacting at 150-170 °C for 8-16 h, centrifuging and drying to obtain a metal-organic compound;

[0064] Calcining the metal-organic compound at a temperature of 275-360 °C for a time of 0.1-10 d to obtain a modified metal-organic compound framework;

[0065] Adding 10-20 parts of zinc petroleum sulfonate, 20-30 parts of sodium 5-mercapto-1-tetrazole acetate, 10-20 parts of 5-iodouracil, 4-6 parts of a surfactant, and 1-5 parts of nano zinc chloride into 30-40 parts of a C1-C6 polyol respectively, and mixing to obtain an inhibitor solution;

[0066] Soaking the modified metal-organic compound framework into the inhibitor solution to obtain a mixture;

[0067] Pressurizing the mixture to 100 kPa to 200 kPa and maintaining for 8-16 h to allow the inhibitor solution to be adsorbed into the modified metal-organic compound framework to obtain an oil corrosion inhibitor.

[0068] Example 1

[0069] An oil corrosion inhibitor is provided, comprising a microcapsule inhibitor composed of a modified metal-organic compound framework and an inhibitor;

[0070] The modified metal-organic compound framework contains a metal salt and 2-aminoterephthalic acid with a mass ratio of 1:1, and the average pore diameter of the modified metal-organic compound framework is 50 nm;

[0071] The inhibitor includes, by mass parts: 10 parts of zinc petroleum sulfonate, 30 parts of sodium 5-mercapto-1-tetrazole acetate, 10 parts of 5-iodouracil, 4 parts of bromotetradecylpyridine, 1 part of nano zinc chloride, and 40 parts of a C1-C6 polyol.

[0072] The metal salt of the MOFs material includes 53% by mass of zinc nitrate hexahydrate and 47% by mass of cobalt chloride hexahydrate.

[0073] Example 2

[0074] An oil corrosion inhibitor is provided, comprising a microcapsule inhibitor composed of a modified metal-organic compound framework and an inhibitor;

[0075] Among them, the modified metal-organic framework contains metal salts, 2,6-naphthalenedicarboxylic acid, and trimesic acid with a mass ratio of 3:1, and the average pore diameter of the modified metal-organic framework is 100 nm;

[0076] The corrosion inhibitor includes, by mass: 20 parts of zinc petroleum sulfonate, 20 parts of 5-mercapto-1-tetrazoleacetic acid sodium, 10 parts of 5-iodouracil, 6 parts of bromotetradecylpyridine, 5 parts of nano-zinc chloride, and 30 parts of C1-C6 polyol.

[0077] The metal salts of the MOFs material include 55% by mass of zinc nitrate hexahydrate and 45% by mass of cobalt chloride hexahydrate.

[0078] Example 3

[0079] A petroleum corrosion inhibitor is provided, including a microcapsule corrosion inhibitor composed of a modified metal-organic framework and a corrosion inhibitor;

[0080] Among them, the modified metal-organic framework contains metal salts and biphenyl-3,3',5,5'-tetracarboxylic acid with a mass ratio of 5:1, and the average pore diameter of the modified metal-organic framework is 200 nm;

[0081] The corrosion inhibitor includes, by mass: 13 parts of zinc petroleum sulfonate, 24 parts of 5-mercapto-1-tetrazoleacetic acid sodium, 12 parts of 5-iodouracil, 5 parts of polyethylene glycol octyl phenyl ether, 2 parts of nano-zinc chloride, and 37 parts of C1-C6 polyol.

[0082] The metal salts of the MOFs material include 58% by mass of zinc nitrate hexahydrate and 42% by mass of cobalt chloride hexahydrate.

[0083] Example 4

[0084] A petroleum corrosion inhibitor is provided, including a microcapsule corrosion inhibitor composed of a modified metal-organic framework and a corrosion inhibitor;

[0085] Among them, the modified metal-organic framework contains metal salts and terephthalic acid with a mass ratio of 8:1, and the average pore diameter of the modified metal-organic framework is 300 nm;

[0086] The corrosion inhibitor includes, by mass: 15 parts of zinc petroleum sulfonate, 25 parts of 5-mercapto-1-tetrazoleacetic acid sodium, 15 parts of 5-iodouracil, 5 parts of polyethylene glycol octyl phenyl ether, 4 parts of nano-zinc chloride, and 35 parts of C1-C6 polyol.

[0087] The metal salts of the MOFs material include 60% by mass of zinc nitrate hexahydrate and 40% by mass of cobalt chloride hexahydrate.

[0088] Example 5

[0089] A petroleum corrosion inhibitor is provided, which includes a microcapsule corrosion inhibitor composed of a modified metal-organic compound framework and a corrosion inhibitor;

[0090] Among them, the modified metal-organic compound framework contains a metal salt and terephthalic acid with a mass ratio of 10:1, and the average pore diameter of the modified metal-organic compound framework is 100 nm;

[0091] The corrosion inhibitor includes, by mass parts: 16 parts of zinc petroleum sulfonate, 26 parts of sodium 5-mercapto-1-tetrazole acetate, 17 parts of 5-iodouracil, 5 parts of polyethylene glycol octyl phenyl ether, 5 parts of nano zinc chloride, and 35 parts of C1-C6 polyhydric alcohol.

[0092] The metal salt of the MOFs material includes 50% by mass fraction of zinc nitrate hexahydrate and 50% by mass fraction of cobalt chloride hexahydrate.

[0093] Comparative Example 1

[0094] A commercially available gemini surfactant product is selected, which includes 26 parts of sodium 5-mercapto-1-tetrazole acetate, 17 parts of 5-iodouracil, and 5 parts of polyethylene glycol octyl phenyl ether.

[0095] Experimental Example:

[0096] The steel material is selected as cold-rolled steel sheets, and the compounded corrosion inhibitors of Examples 1-5 and Comparative Example 1 are injected and mixed evenly. The corrosion inhibition performance is tested at different temperatures (20 - 50 °C) and different corrosion immersion times (2 - 148 h). Table 1 shows the test data of 3.0 mol / L H2SO4, and the method is the weight loss method.

[0097] Table 1. Test data of 3.0 mol / L H2SO4

[0098]

[0099]

[0100] The petroleum corrosion inhibitor and its preparation method provided by the present invention overcome the existing corrosion inhibitors with good slow-release effects, and are based on the compounding of 5-mercapto-1-tetrazole acetate sodium and 5-iodouracil, which are N-heterocyclic compounds with a large number of N atoms and a large conjugated system in the molecular structure. Surfactants bromotetradecylpyridine and OP (polyethylene glycol octyl phenyl ether), as well as nano zinc chloride and zinc petroleum sulfonate, are added to assist the corrosion inhibitor to play a synergistic effect.

[0101] The present invention is encapsulated by microcapsule technology to achieve slow release or controlled release in the oilfield environment, thereby improving the efficiency and persistence of the corrosion inhibitor. The microcapsule corrosion inhibitor can prevent the agent from being inactivated in the corrosive environment, improve its effective utilization rate, extend the effective period of the agent, and at the same time improve the stability of the agent and reduce the change of compatibility. Moreover, the MOFs material adopted in the present invention has high porosity and specific surface area, easily adjustable pore size and pore structure, has good adsorption capacity for hydrogen sulfide gas, and has better corrosion inhibition effect.

[0102] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An oil corrosion inhibitor, characterized in that, A microcapsule corrosion inhibitor comprising a modified metal-organic framework and a corrosion inhibitor; Among them, the modified metal-organic framework contains a metal salt and an organic ligand with a mass ratio of 1-10:1, and the average pore size of the modified metal-organic framework is 50-300 nm; The corrosion inhibitor includes, by mass: 10-20 parts of zinc petroleum sulfonate, 20-30 parts of sodium 5-mercapto-1-tetrazole acetate, 10-20 parts of 5-iodouracil, 4-6 parts of surfactant, 1-5 parts of nano zinc chloride, and 30-40 parts of solvent.

2. The petroleum corrosion inhibitor according to claim 1, wherein The metal salt of the MOFs material includes 50-60% by mass of zinc ion hydrated compound and 40-50% by mass of cobalt ion hydrated compound.

3. The petroleum corrosion inhibitor according to claim 2, wherein, The zinc ion hydrated compound is zinc nitrate hexahydrate; the cobalt ion hydrated compound is cobalt chloride hexahydrate.

4. The petroleum corrosion inhibitor according to claim 1, characterized in that, The organic ligand is at least one of 2-aminoterephthalic acid, 2,6-naphthalenedicarboxylic acid, trimesic acid, biphenyl-3,3',5,5'-tetracarboxylic acid, and terephthalic acid.

5. The petroleum corrosion inhibitor according to claim 1, wherein The surfactant is bromotetradecylpyridine or polyethylene glycol octyl phenyl ether.

6. The petroleum corrosion inhibitor according to claim 1, wherein The solvent is a C1-C6 polyol.

7. A preparation method of the petroleum corrosion inhibitor according to any one of claims 1-6, characterized in that, Including the following steps: Prepare the modified metal-organic framework; Prepare a corrosion inhibitor solution; Soak the modified metal-organic framework into the corrosion inhibitor solution, so that the corrosion inhibitor solution is adsorbed into the modified metal-organic framework to obtain the petroleum corrosion inhibitor.

8. The preparation method according to claim 7, characterized in that, The preparation of the modified metal-organic framework includes: Add the metal salt and the organic ligand to N,N-dimethylformamide, pour it into a hydrothermal reactor, react at 150-170 °C for 8-16 h, centrifuge and dry to obtain a metal-organic compound; Calcine the metal-organic compound, the calcination temperature is 275-360 °C, and the calcination time is 0.1-10 d to obtain the modified metal-organic framework.

9. The preparation method according to claim 7, wherein The preparation of the corrosion inhibitor solution includes: Add 10-20 parts of zinc petroleum sulfonate, 20-30 parts of sodium 5-mercapto-1-tetrazole acetate, 10-20 parts of 5-iodouracil, 4-6 parts of surfactant, and 1-5 parts of nano zinc chloride into 30-40 parts of a C1-C6 polyol respectively, and mix to obtain the corrosion inhibitor solution.

10. The preparation method according to claim 7, characterized in that, The soaking of the modified metal-organic framework into the corrosion inhibitor solution, so that the corrosion inhibitor solution is adsorbed into the modified metal-organic framework to obtain the petroleum corrosion inhibitor includes: Soak the modified metal-organic framework into the corrosion inhibitor solution to obtain a mixture; Pressurize the mixture to 100 kPa-200 kPa, and keep it for 8-16 h to make the corrosion inhibitor solution adsorbed into the modified metal-organic framework to obtain the petroleum corrosion inhibitor.

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