CN111020596B - Water-soluble corrosion inhibitor for gas well and preparation method thereof - Google Patents
Water-soluble corrosion inhibitor for gas well and preparation method thereof Download PDFInfo
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- CN111020596B CN111020596B CN201911338141.3A CN201911338141A CN111020596B CN 111020596 B CN111020596 B CN 111020596B CN 201911338141 A CN201911338141 A CN 201911338141A CN 111020596 B CN111020596 B CN 111020596B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
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Abstract
The invention discloses a water-soluble corrosion inhibitor for a gas well and a preparation method thereof, wherein the water-soluble corrosion inhibitor comprises the following components in percentage by massThe raw materials of the gas well corrosion inhibitor comprise 20-30% of a main agent and 70-80% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises 10-12% of alkylamine, 4-6% of aryl thiourea, 10-15% of acrylic acid copolymer, 2-4% of a surfactant and 33-54% of a solvent based on the total mass of the gas well water-soluble corrosion inhibitor. The amino bimolecular acid imidazoline can contain CO2The protective agent has excellent protection on carbon steel oil pipes and equipment in the gas well environment of gas. The product has the advantages of good water solubility, no emulsification to condensate oil, excellent anticorrosion effect, no pungent smell, small addition amount, high corrosion inhibition efficiency, compact and uniform adsorption film formation, capability of preventing local corrosion and the like in the application process of a gas well containing high-salinity water.
Description
Technical Field
The invention relates to corrosion of ferrous metal in drilling, production and storage of oil and gas wells, belongs to the technical field of oil well and equipment protection in the field of petroleum and petrochemical industry, and particularly relates to a water-soluble corrosion inhibitor for a gas well and a preparation method thereof.
Background
Corrosion of metals in oil and gas well drilling and production systems is a serious problem because of the presence of H in the injected and produced water2S、O2、CO2Organic acids, inorganic acids and salts, exacerbate corrosion behavior. Thereby resulting in accelerated corrosion.
Although many materials have been developed over the years to inhibit corrosion in drilling, production and storage systems, there is still a need to develop new corrosion inhibitors.
The corrosion inhibitor protects oil and gas well equipment, and the main corrosion prevention principle is that organic matters containing N, O, S atoms in the corrosion inhibitor can be firmly adsorbed on the surface of metal, so that the attack of corrosive media to the metal is slowed down, and the purpose of corrosion prevention is achieved.
In recent years, although the research on corrosion inhibitors for corrosion of gas collecting pipelines of oil and gas fields has been greatly advanced at home and abroad, for example, a water-soluble imidazoline amide corrosion inhibitor and a preparation method and a use method thereof (CN101705112A) are disclosed, which mainly aim at CO2The preservative effect is good, and the main component is imidazoline amide; a water injection corrosion inhibitor (CN1277241) for oil fields mainly aims at the development of oil field reinjection water and is mainly applied to a sewage reinjection system of oil and gas fields. anti-H2S/CO2Corrosion inhibitors under combined action (CN1966774) which are mainly used for gathering pipelines.
The imidazoline corrosion inhibitors have good corrosion prevention effect on gathering pipelines or sewage pipelines, but the corrosion inhibitors have reduced adsorption capacity due to the increase of temperature in oil pipes of gas wells, so that the corrosion prevention effect is obviously reduced.
Disclosure of Invention
The invention provides a water-soluble corrosion inhibitor for a gas well and a preparation method thereof, which are used for solving the problems that the adsorption capacity of the corrosion inhibitor is reduced and the corrosion prevention effect is obviously reduced in the oil pipe of the gas well due to the increase of the temperature of the traditional imidazoline corrosion inhibitor.
The technical solution of the invention is as follows: a water-soluble corrosion inhibitor for a gas well comprises, by mass, 20-30% of a main agent and 70-80% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the structural formula of the main agent is as follows:
r1 is one of 2-amino butanediyl, 2-amino pentanediyl or 2-amino decanediyl,
r2 is one of hydroxypropyl, ethyl, hydroxyethyl or tetrahydroxyethyl,
the compound is composed of 10-12% of alkylamine, 4-6% of aryl thiourea, 10-15% of acrylic copolymer, 2-4% of surfactant and 33-54% of solvent by total mass of the water-soluble corrosion inhibitor for the gas well;
the main agent is a product synthesized according to the following steps:
adding amino acid and polyamine into a reaction kettle according to the mol ratio of 1:2.2-2.5, adding xylene as a water carrying agent which is 10-12% of the total material amount of the amino acid and the polyamine, heating and stirring to 150-.
The amino acid is selected from one of 2-aminosuccinic acid, 2-aminoglutaric acid and 2-aminosebacic acid.
The polyamine is selected from one of hydroxyethyl ethylenediamine, ethyl ethylenediamine, hydroxypropyl ethylenediamine and tetrahydroxyethyl ethylenediamine.
The alkylamine in the compound is selected from one of dodecylamine, tetradecylamine, hexadecylamine and octadecylamine.
The aryl thiourea in the compound is one of phenylthiourea, o-tolylthiourea and p-methoxyphenyl thiourea.
The acrylic copolymer in the compound is one of acrylic acid-hydroxypropyl acrylate copolymer, methyl acrylate copolymer and acrylic acid-maleic acid copolymer.
The surfactant in the compound is one of polyethylene glycol polyoxyethylene ether PEG-200, PEG-300, PEG-400 and PEG-600.
The solvent in the compound is ethylene glycol monobutyl ether or dimethyl sulfoxide.
A preparation method of a water-soluble corrosion inhibitor for a gas well comprises the following steps:
(1) mixing and uniformly stirring 10-12% of alkylamine, 4-6% of aryl thiourea, 10-15% of acrylic copolymer, 2-4% of surfactant and 33-54% of solvent by total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(2) according to the mass fraction, 20-30% of the main agent and 70-80% of the compound are mixed and stirred evenly to obtain the finished product.
The invention provides a water-soluble corrosion inhibitor for a gas well and a preparation method thereof, the corrosion inhibitor can be widely applied to highly mineralized water of a gas well system of an oil-gas field, the corrosion inhibitor can effectively control corrosion of corrosive media in an oil pipe of the gas well to equipment and a pipeline, the corrosion inhibition rate is over 80 percent, the corrosion inhibitor meets the corrosion index specification (the corrosion inhibition rate is more than or equal to 70 percent) in the standard of SY/T5273-2014 corrosion inhibitor performance index and evaluation method for water treatment of oil field produced, and has the advantages of no pungent smell, small addition amount, high corrosion inhibition efficiency, compact and uniform adsorption film forming, capability of preventing local corrosion and the like.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts, based on the embodiments of the present invention, belong to the scope of protection of the present invention, and in the context of the present invention the terms "oil well drilling, production and storage system" and "gas well drilling, production and storage system" comprise all corrosion-prone pipes and equipment for drilling, producing and storing oil and gas from underground formations.
Example 1
The embodiment 1 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises the following raw materials of, by mass, 28% of a main agent and 72% of a compound, wherein the main agent is amino bimolecular acid imidazoline; the compound consists of 10% of alkylamine, 4% of aryl thiourea, 12% of acrylic copolymer, 4% of surfactant and 2% of solvent by total mass of the water-soluble corrosion inhibitor for the gas well.
Wherein, the alkylamine is dodecylamine, the aryl thiourea is phenylthiourea, the acrylic copolymer is acrylic acid-hydroxypropyl acrylate copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-200, and the solvent is ethylene glycol monobutyl ether.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.2 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, keeping the temperature for 3 hours, the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then continuously heated to 220 ℃, keeping the temperature for 4 hours, the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling, testing the acid value, and obtaining the main agent amino bimolecular acid imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring 10% of dodecylamine, 4% of phenylthiourea, 12% of acrylic acid-hydroxypropyl acrylate copolymer, 4% of polyethylene glycol polyoxyethylene ether PEG-200 and 44% of ethylene glycol monobutyl ether uniformly by the total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 28% of the main agent obtained in the step (1) and 74% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-01.
Example 2
The embodiment 2 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises the following raw materials of, by mass, 20% of a main agent and 80% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, by mass of the total mass of the water-soluble corrosion inhibitor for the gas well, 10% of alkylamine, 6% of aryl thiourea, 10% of acrylic copolymer, 4% of surfactant and 50% of solvent.
Wherein, the alkylamine is octadecylamine, the aryl thiourea is o-tolylthiourea, the acrylic copolymer is acrylic acid-hydroxypropyl acrylate copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-600, and the solvent is dimethyl sulfoxide.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.5 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, and preserving the temperature for 3 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then heated to 220 ℃, and preserving the temperature for 4 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling and testing the acid value, and obtaining main agent amino bimolecular imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and uniformly stirring 10% of octadecylamine, 6% of o-tolylthiourea, 10% of acrylic acid-hydroxypropyl acrylate copolymer, 4% of polyethylene glycol polyoxyethylene ether PEG-600 and 50% of dimethyl sulfoxide by total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 20% of the main agent obtained in the step (1) and 80% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-02.
Example 3
The embodiment 3 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises, by mass, 25% of a main agent and 75% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, based on the total mass of the water-soluble corrosion inhibitor for the gas well, 10% of alkylamine, 6% of aryl thiourea, 12% of an acrylic acid copolymer, 4% of a surfactant and 43% of a solvent.
Wherein, the alkylamine is hexadecylamine, the aryl thiourea is p-methoxyphenyl thiourea, the acrylic copolymer is methyl acrylate copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-600, and the solvent is ethylene glycol monobutyl ether.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.5 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, and preserving the temperature for 3 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then heated to 220 ℃, and preserving the temperature for 4 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling and testing the acid value, and obtaining main agent amino bimolecular imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring 10% of hexadecylamine, 6% of p-methoxyphenyl thiourea, 12% of methyl acrylate copolymer, 4% of polyethylene glycol polyoxyethylene ether PEG-600 and 43% of ethylene glycol monobutyl ether uniformly by the total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 25% of the main agent obtained in the step (1) and 75% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-03.
Example 4
The embodiment 4 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises, by mass, 20% of a main agent and 80% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, based on the total mass of the water-soluble corrosion inhibitor for the gas well, 12% of alkylamine, 6% of aryl thiourea, 15% of acrylic acid copolymer, 2% of a surfactant and 45% of a solvent.
Wherein, the alkylamine is dodecylamine, the aryl thiourea is p-methoxyphenyl thiourea, the acrylic copolymer is acrylic acid-maleic acid copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-400, and the solvent is ethylene glycol monobutyl ether.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.5 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, and preserving the temperature for 3 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then heated to 220 ℃, and preserving the temperature for 4 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling and testing the acid value, and obtaining main agent amino bimolecular imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring 12% of dodecylamine, 6% of p-methoxyphenyl thiourea, 15% of acrylic acid-maleic acid copolymer, 2% of polyethylene glycol polyoxyethylene ether PEG-400 and 45% of ethylene glycol monobutyl ether uniformly by the total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 20% of the main agent obtained in the step (1) and 80% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-04.
Example 5
The embodiment 5 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises, by mass, 30% of a main agent and 70% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, based on the total mass of the water-soluble corrosion inhibitor for the gas well, 10% of alkylamine, 6% of aryl thiourea, 10% of acrylic acid copolymer, 4% of a surfactant and 40% of a solvent.
Wherein, the alkylamine is dodecylamine, the aryl thiourea is phenylthiourea, the acrylic copolymer is acrylic acid-maleic acid copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-300, and the solvent is ethylene glycol monobutyl ether.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.2 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, keeping the temperature for 3 hours, the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then continuously heated to 220 ℃, keeping the temperature for 4 hours, the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling, testing the acid value, and obtaining the main agent amino bimolecular acid imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring 10% of dodecylamine, 6% of phenylthiourea, 10% of acrylic acid-maleic acid copolymer, 4% of polyethylene glycol polyoxyethylene ether PEG-300 and 40% of ethylene glycol monobutyl ether uniformly by total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 30% of the main agent obtained in the step (1) and 70% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-05.
Example 6
The embodiment 6 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises the following raw materials of, by mass, 25% of a main agent and 75% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, by mass of the total mass of the water-soluble corrosion inhibitor for the gas well, 10% of alkylamine, 4% of aryl thiourea, 10% of acrylic copolymer, 4% of a surfactant and 47% of a solvent.
Wherein, the alkylamine is octadecylamine, the aryl thiourea is o-tolylthiourea, the acrylic copolymer is acrylic acid-maleic acid copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-300, and the solvent is dimethyl sulfoxide.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.2 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, keeping the temperature for 3 hours, the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then continuously heated to 220 ℃, keeping the temperature for 4 hours, the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling, testing the acid value, and obtaining the main agent amino bimolecular acid imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring 10% of octadecylamine, 4% of o-tolylthiourea, 10% of acrylic acid-maleic acid copolymer, 4% of polyethylene glycol polyoxyethylene ether PEG-300 and 47% of dimethyl sulfoxide uniformly by total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 25% of the main agent obtained in the step (1) and 75% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-06.
Example 7
The embodiment 7 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises, by mass, 30% of a main agent and 70% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, based on the total mass of the water-soluble corrosion inhibitor for the gas well, 10% of alkylamine, 4% of arylthiourea, 12% of an acrylic copolymer, 3% of a surfactant and 41% of a solvent.
Wherein, the alkylamine is tetradecylamine, the aryl thiourea is o-tolylthiourea, the acrylic copolymer is acrylic acid-hydroxypropyl acrylate copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-400, and the solvent is dimethyl sulfoxide.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.2 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, keeping the temperature for 3 hours, the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then continuously heated to 220 ℃, keeping the temperature for 4 hours, the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling, testing the acid value, and obtaining the main agent amino bimolecular acid imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring 10% of tetradecylamine, 4% of o-tolylthiourea, 12% of acrylic acid-hydroxypropyl acrylate copolymer, 3% of polyethylene glycol polyoxyethylene ether PEG-400 and 41% of dimethyl sulfoxide uniformly by total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(3) and (3) mixing and uniformly stirring 30% of the main agent obtained in the step (1) and 70% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-07.
Example 8
The embodiment 8 of the invention provides a water-soluble corrosion inhibitor for a gas well, which comprises, by mass, 23% of a main agent and 77% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the compound comprises, based on the total mass of the water-soluble corrosion inhibitor for the gas well, 12% of alkylamine, 6% of arylthiourea, 12% of acrylic acid copolymer, 3% of a surfactant and 44% of a solvent.
Wherein, the alkylamine is tetradecylamine, the arylthiourea is o-tolylthiourea, the acrylic copolymer is methyl acrylate copolymer, the surfactant is polyethylene glycol polyoxyethylene ether PEG-600, and the solvent is ethylene glycol monobutyl ether.
Specifically, the preparation method of the water-soluble corrosion inhibitor for the gas well comprises the following steps:
(1) adding 2-aminosuccinic acid and hydroxyethyl ethylenediamine into a reaction kettle according to a molar ratio of 1:2.5 for reaction, and simultaneously adding xylene as a water carrying agent, wherein the xylene carrying agent is 10% of the total mass of the gas well water-soluble corrosion inhibitor, heating, stirring, raising the temperature to 160 ℃, and preserving the temperature for 3 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, water flows out of a condensation pipe at the top of the reaction kettle in the reaction process, the generated amide is then heated to 220 ℃, and preserving the temperature for 4 hours, wherein the heating rate is less than or equal to 20 ℃/10 minutes, then removing one molecule of water, carrying out cyclization, cooling to below 50 ℃, sampling and testing the acid value, and obtaining main agent amino bimolecular imidazoline;
the reaction formula is as follows:
the first step is as follows: amidation reaction
The second step is that: cyclization reaction
(2) Mixing and stirring evenly 12% of tetradecylamine, 6% of o-tolylthiourea, 12% of methyl acrylate copolymer, 3% of polyethylene glycol polyoxyethylene ether PEG-600 and 44% of ethylene glycol monobutyl ether to obtain a compound;
(3) and (3) mixing and uniformly stirring 23% of the main agent obtained in the step (1) and 77% of the compound obtained in the step (2) according to the mass fraction to obtain a finished product, namely code SW-08.
Example 9
In order to test the protection effect of the corrosion inhibitor on the oil pipe of the gas well, the corrosion inhibition effect of the water-soluble corrosion inhibitor for the gas well in the embodiments 1 to 8 is evaluated by simulating the gas field and gas well system environment with a high-temperature high-pressure autoclave.
The experimental conditions used in the simulation experiment are shown in table 1, the water sample analysis results are shown in table 2, and the hanging piece sample material is N80.
TABLE 1 evaluation parameters of the simulation test
| Item | Test conditions |
| Temperature (. degree.C.) | 70 |
| Pressure (MPa) | 20 |
| CO2Partial pressure (MPa) | 0.21 |
| Test time (sky) | 3 |
TABLE 2 Water sample analysis results
Through high-temperature and high-pressure tests, working condition environments in the tables 1 and 2 are simulated, and test results are shown in the table 3 under the condition that the test period is 3 days.
TABLE 3 Corrosion inhibitor Corrosion evaluation results
As can be seen from Table 3, in examples 1-8, when the addition amount of the well water-soluble corrosion inhibitor is 300mg/L, the corrosion inhibition rate is greater than 85%, and the standard SY/T5273-2014 corrosion index specification (the corrosion inhibition rate is greater than or equal to 70%) is met.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A water-soluble corrosion inhibitor for a gas well is characterized in that raw materials of the water-soluble corrosion inhibitor comprise, by mass, 20-30% of a main agent and 70-80% of a compound, wherein the main agent is amino bimolecular acid imidazoline, and the structural formula of the water-soluble corrosion inhibitor is as follows:
r1 is one of 2-amino butanediyl, 2-amino pentanediyl or 2-amino decanediyl,
r2 is one of hydroxypropyl, ethyl, hydroxyethyl or tetrahydroxyethyl,
the compound is composed of 10-12% of alkylamine, 4-6% of aryl thiourea, 10-15% of acrylic copolymer, 2-4% of surfactant and 33-54% of solvent by total mass of the water-soluble corrosion inhibitor for the gas well;
the main agent is a product synthesized according to the following steps:
adding amino acid and polyamine into a reaction kettle according to the mol ratio of 1:2.2-2.5, adding xylene as a water carrying agent which is 10-12% of the total material amount of the amino acid and the polyamine, heating and stirring to 150-.
2. The water-soluble corrosion inhibitor for gas wells as recited in claim 1, wherein the amino acid is selected from the group consisting of 2-aminosuccinic acid, 2-aminoglutaric acid, and 2-aminosebacic acid.
3. A water soluble corrosion inhibitor for gas wells as claimed in claim 1 wherein said polyamine is selected from one of hydroxyethylethylenediamine, ethylethylenediamine, hydroxypropylethylenediamine and tetrahydroxyethylethylenediamine.
4. A water soluble corrosion inhibitor for gas wells as in claim 1 wherein the alkylamine in the formulation is selected from the group consisting of dodecylamine, tetradecylamine, hexadecylamine and octadecylamine.
5. The water-soluble corrosion inhibitor for gas wells as recited in claim 1, wherein the aryl thiourea in the compound is one of phenylthiourea, o-tolylthiourea and p-methoxyphenylthiourea.
6. The water-soluble corrosion inhibitor for gas wells as recited in claim 1, wherein the acrylic acid copolymer in the formulation is one of acrylic acid-hydroxypropyl acrylate copolymer, methyl acrylate copolymer and acrylic acid-maleic acid copolymer.
7. The water-soluble corrosion inhibitor for gas wells as recited in claim 1, wherein the surfactant in the formulation is selected from one of polyethylene glycol polyoxyethylene ether PEG-200, PEG-300, PEG-400, and PEG-600.
8. A water soluble corrosion inhibitor for gas wells as claimed in claim 1 wherein the solvent in the formulation is ethylene glycol monobutyl ether or dimethyl sulfoxide.
9. A method of producing a water soluble corrosion inhibitor for gas wells as claimed in any of claims 1 to 8 comprising the steps of:
(1) mixing and uniformly stirring 10-12% of alkylamine, 4-6% of aryl thiourea, 10-15% of acrylic copolymer, 2-4% of surfactant and 33-54% of solvent by total mass of the water-soluble corrosion inhibitor of the gas well to obtain a compound;
(2) according to the mass fraction, 20-30% of the main agent and 70-80% of the compound are mixed and stirred evenly to obtain the finished product.
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