WO2023124953A1 - Bactericidal corrosion inhibitor as well as preparation method therefor and use thereof - Google Patents

Abstract

Disclosed in the present invention are a bactericidal corrosion inhibitor as well as a preparation method therefor and the use thereof. The bactericidal corrosion inhibitor comprises, by weight, the following components: 10-90% of a compound of formula (I), 10-90% of an organic polar solvent, and 0-20% of an auxiliary agent, with the balance being water. Formula (I). The bactericidal corrosion inhibitor disclosed in the present invention can be quickly adsorbed onto the surface of metal and the surface of bacteria, has good corrosion inhibition capability, bactericidal capability and bacterial inhibition capability, can control the rate of corrosion, mainly hydrogen sulfide corrosion or carbon dioxide corrosion, to be 0.076 mm/a or below, and can effectively kill sulfate-reducing bacteria (SRB) with a bactericidal rate reaching 99% or above.

Description

A kind of bactericidal corrosion inhibitor and its preparation method and application technical field

The invention relates to the field of petroleum and natural gas, in particular to a bactericidal corrosion inhibitor and its preparation method and application.

Background technique

Industrial water systems in the oil and gas field in general, and industrial water in wells in oil and gas fields in particular, serve many different purposes. Any water system, including its equipment and water, is susceptible to microbial contamination and fouling. Metal surfaces in any water system are susceptible to corrosion, in part due to microbial contamination and "microbial-influenced corrosion". That is, the corrosion of metal surfaces caused directly or indirectly by the corrosion of metals; and the corrosion caused by bacteria and their by-products and metabolites on metal surfaces, especially including bacteria growing on metal surfaces in biofilms. Biocorrosion, or biologically induced corrosion, is generally associated with surface pitting, which results in faster corrosion damage compared to uniform corrosion.

Biocorrosion, or biologically induced chemical corrosion, is usually caused by "sulfate-reducing bacteria" (SRB), which is regarded as one of the main culprits of biocorrosion under anaerobic conditions. It includes a group of bacteria including at least 137 species in 40 genera that produce _H2S and use sulfate as a terminal electron acceptor. Many SRBs are considered obligate anaerobes, meaning they can temporarily tolerate low levels of oxygen, but the cells cannot metabolize and/or replicate normally in the presence of oxygen. Furthermore, due to the microenvironment created within the bacterial biofilm/corrosion product layer, anaerobic conditions capable of supporting SRB growth can be created throughout the aerobic environment. In addition, the biocorrosion or chemical corrosion caused by biology also includes biocorrosion or chemical corrosion caused by saprophytic bacteria and iron bacteria.

Generally, the biological corrosion caused by SRB or the chemical corrosion caused by _H2S and _CO2 produced by SRB metabolism use, for example, tetramethylammonium salt, tetraethylammonium salt, tetrapropylammonium salt, tetrabutylammonium salt, tetrahexylammonium salt, etc. Ammonium salt, quaternary ammonium salt of tetraoctyl ammonium salt for sterilization or control.

Hydrogen sulfide and carbon dioxide are produced when organic matter is _decomposed by _bacteria during the formation of oil and natural gas. serious challenge.

At present, adding bactericides and corrosion inhibitors has become the mainstream method to inhibit corrosion and ensure pipeline safety. Among them, bactericides are used to kill microorganisms, and corrosion inhibitors mainly play a role in inhibiting electrochemical corrosion. Patent application CN106719681A discloses a bactericidal corrosion inhibitor for oilfields and its preparation method. Patent application CN110273157A discloses a corrosion inhibitor with bactericidal and scale-inhibiting functions and its preparation method. Patent application CN104628097A is a composition for bactericidal corrosion inhibitor. Application CN109971447A discloses a bactericidal corrosion inhibitor used in oil well gathering and transportation and sewage treatment systems and a preparation method thereof. Patent application JP2006348079A discloses a diamine alkoxy compound, which has the properties of sterilization, low foam and corrosion inhibition. Patent application RU2255141C1 discloses a patent for a bactericidal corrosion inhibitor for oilfield hydrogen sulfide-mineralized water medium, which is composed of C8-C18 primary fatty amines and phosphorus-containing acid derivatives, especially phosphoric acid and polyhydric alcohols The product reaction is made. Patent application RU2259393C2 discloses a bactericidal corrosion inhibitor for industrial detergent components with antiseptic and bactericidal properties, the bactericidal corrosion inhibitor is prepared by reacting N,N-methylmethanediamine with alkyl and alkenyl chlorides , the cleaning agent can be used in all industrial fields where the metal surface is adhered by organic oil, including oil gas, lubricating oil, latex, asphalt, tar, paraffin, etc. Patent application US9802908B2 discloses that an ethylbenzyl quaternary ammonium salt of aminoamide has bactericidal properties and can be used as a bentonite cleaner and corrosion inhibitor for oil field cleaning. These technologies can all play a certain role in sterilization and corrosion inhibition.

But the prior art at least faces the following problems: 1) Most of the existing bactericidal and corrosion inhibitor products are compositions, that is, the corrosion inhibitor and the bactericide are mixed. The performance of such products is difficult to improve on the basis of the original corrosion inhibitors and fungicides, and the total usage is relatively large. 2) In terms of the on-site application process of the bactericidal corrosion inhibitor composition, two sets of filling systems are used respectively, which increases construction, operation, maintenance, management costs and safety risks.

Contents of the invention

In order to solve at least one of the above technical problems, the present invention provides a bactericidal corrosion inhibitor and its preparation method and application. The bactericidal corrosion inhibitor of the invention has a novel structure and has both corrosion inhibition and bactericidal functions. Compared with single aldehyde fungicides, the bactericidal corrosion inhibitor of the present invention can effectively reduce the tolerance of various strains; compared with quaternary ammonium salt fungicides, it can significantly reduce foam, and can still maintain high-efficiency bactericidal power after long-term use .

In order to achieve the above object, the present invention adopts the following technical solutions:

One aspect of the present invention provides a bactericidal corrosion inhibitor, which comprises the following components in weight percentage: 10-90% of the compound of formula (I), 10-90% of the organic polar solvent, 0-20 % additives and balance water;

Among them, _R1 is selected from substituted or unsubstituted C1～C20 straight chain or branched chain alkyl, C1～C20 alkoxyl, substituted or unsubstituted C1～C20 straight chain or branched chain alkenyl, C1～C20 alkylthio One of radical, substituted or unsubstituted C3~C20 cycloalkyl, substituted or unsubstituted C6~C30 aryl, substituted or unsubstituted C2~C30 heteroaryl;

_R2 is selected from H, substituted or unsubstituted C1~C20 straight chain or branched chain alkyl, C1~C20 alkoxy, substituted or unsubstituted C1~C20 straight chain or branched chain alkenyl, C1~C20 alkylthio One of radical, substituted or unsubstituted C3~C20 cycloalkyl, substituted or unsubstituted C6~C30 aryl, substituted or unsubstituted C2~C30 heteroaryl;

X ^- is selected from COO ^- , SO ₃ ^- , H ₂ PO ₄ ^- or HSO ₄ ^- .

According to the fungicidal corrosion inhibitor of the present invention, preferably, the R ₁ is selected from substituted or unsubstituted C1-C20 straight chain or branched chain alkyl, substituted or unsubstituted C1-C20 straight chain or branched chain alkenyl.

According to the fungicidal corrosion inhibitor of the present invention, preferably, the R ₁ is selected from substituted or unsubstituted C1-C20 linear or branched alkyl groups.

According to the fungicidal corrosion inhibitor of the present invention, preferably, the R ₁ is selected from substituted or unsubstituted C6-C15 linear alkyl groups. More preferably, the R ₁ is selected from substituted or unsubstituted C6, C7, C8, C9, C10, C11, C12, C13, C14, C15 linear alkyl groups.

The substituents in the above substituted groups may be hydroxyl, mercapto, amino, carbonyl, alkenyl, alkynyl, alkyl and the like.

According to the fungicidal corrosion inhibitor of the present invention, preferably, the R ₁ is a linear undecyl group.

According to the fungicidal corrosion inhibitor of the present invention, preferably, R ₂ is selected from one of H, substituted or unsubstituted C1-C20 linear or branched alkyl, substituted or unsubstituted C6-C30 aryl.

According to the fungicidal corrosion inhibitor of the present invention, preferably, _R2 is selected from H, C1~C20 straight chain or branched chain alkyl, mercapto substituted C1~C20 straight chain or branched chain alkyl, alkyl substituted C6~C30 One of the aryls.

According to the fungicidal corrosion inhibitor of the present invention, preferably, _R is H, methyl, mercaptomethyl or p-tolyl.

According to the fungicidal corrosion inhibitor of the present invention, preferably, the organic polar solvent includes one or a combination of two or more of alcohols, amides, nitriles, pyridines, ketones, ethers and aromatic compounds.

According to the bactericidal corrosion inhibitor of the present invention, preferably, the alcohols include methanol, ethanol, propanol, isopropanol, butanol, methyl ethanol, isobutanol, amyl alcohol, isoamyl alcohol, ethylene glycol, 2-Methyl-1-butanol.

According to the bactericidal corrosion inhibitor of the present invention, preferably, the auxiliary agent includes one or a combination of two or more of thiourea, thiazole, silicone and its derivatives, halogenated alkanes, halogenated olefins and halogenated aromatics.

According to the bactericidal corrosion inhibitor of the present invention, preferably, the auxiliary agent is methyl iodide or allyl chloride.

According to the bactericidal corrosion inhibitor of the present invention, preferably, the mass percentage of the compound of formula (I) is 20-25%, the mass percentage of the organic polar solvent is 20-30%, and the mass percentage of the auxiliary agent is 0-10%, more preferably 5-10%.

Another aspect of the present invention provides a preparation method of more than one bactericidal corrosion inhibitor, the preparation method comprising the following steps:

After the imidazole compound corresponding to R ₁ is reacted with the acid R ₂ -X in an organic polar solvent, an auxiliary agent is added to continue the reaction, and then water is added to obtain the bactericidal corrosion inhibitor.

According to the preparation method of the present invention, preferably, the acid is selected from organic acids or inorganic acids, and the organic acids include acetic acid (CH ₃ COOH, R ₂ is CH ₃ , X ^- is COO ^- ), thioglycolic acid (

R ₂ is SHCH ₂ , X ^- is COO ^- ) and p-toluenesulfonic acid (

R ₂ is p-tolyl, X ^- is SO ₃ ^- ); the inorganic acid includes phosphoric acid (H ₃ PO ₄ , R ₂ is H, X ^- is H ₂ PO ₄ ^- ) and sulfuric acid (H ₂ SO ₄ , R ₂ is H, X ^- is HSO ₄ ^- ).

According to the preparation method of the present invention, preferably, the reaction temperature of the imidazole compound and the acid R ₂ -X is 10-100°C, more preferably 40°C.

According to the preparation method of the present invention, preferably, the reaction time of the imidazole compound and the acid R ₂ -X is 0.5-24 hours.

According to the preparation method of the present invention, preferably, the reaction temperature of the imidazole compound and the acid R ₂ -X is 20-80° C., and the time is 0.5-24 hours.

According to the preparation method of the present invention, preferably, the temperature for adding auxiliary agents to continue the reaction is 40-80° C., and the time is 2-8 hours. More preferably, the temperature is 60°C and the time is 4 hours.

According to the preparation method of the present invention, preferably, the molar ratio of the imidazole compound to the acid R ₂ -X is 1:(1-6), more preferably 1:(2-5), further preferably 1:( 3～4), such as 1:1.

According to the preparation method of the present invention, preferably, the mass percentage of the organic polar solvent in the reaction system is 10-90%, such as 80-90%, 70-90%, 60-90%, 50-90%.

According to the preparation method of the present invention, preferably, the mass percentage of the auxiliary agent in the reaction system is 0-20%, more preferably 0-10%, even more preferably 5-10%.

Another aspect of the present invention provides the application of the above bactericidal corrosion inhibitor in microbial corrosion protection or chemical corrosion protection in oil and gas fields.

The microorganisms in the microbial corrosion include one or more of sulfate-reducing bacteria, saprophytic bacteria and iron bacteria. The chemical corrosion includes corrosion caused by H ₂ S and CO ₂ .

The compound of formula (I) of the present invention and the bactericidal corrosion inhibitor prepared thereof can be quickly adsorbed on the metal surface and the surface of bacteria, and the corrosion inhibition ability, bactericidal ability and antibacterial ability are good. The corrosion rate of hydrogen corrosion or carbon dioxide corrosion is controlled below 0.076mm/a, which can effectively kill sulfate reducing bacteria (SRB), and the sterilization rate can reach more than 99%.

In terms of bactericidal mechanism, effective bactericidal molecules generally contain hydrophilic cationic groups and hydrophobic alkyl chains. The mechanism is mainly that antibacterial polymers first adhere to the surface of bacteria through electrostatic interactions, and then the substituted alkyl groups on the molecules pass through hydrophobic Therefore, an effective polymer fungicide should contain three elements: ① It must be in full contact with the cells; ② It must have sufficient cationic charges to promote the adhesion to the microbial cell membrane; ③ It must be Some hydrophobic chains can be adsorbed and integrated into the porous cell membrane. Because the surface of the bacterial cell membrane is negatively charged, the compound of formula (I) of the present invention is a positively charged ionic compound, which can be adsorbed on the surface of the bacterial cell membrane through electrostatic interaction, and the hydrophobic base part of the compound penetrates the cell membrane and enters the interior of the cell to play a bactericidal effect. Imidazole derivatives are a class of broad-spectrum fungicides, but they are not widely used in practice due to their poor water solubility. 2-Undecyl imidazole itself has a weak base and can react with organic acids to form positively charged ionic compounds to enhance its water solubility. At the same time, it plays the role of adsorption and sterilization. In addition, the S and P in the organic acid can enhance the performance of corrosion inhibition.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

All numerical designations (eg, temperature, time, concentration, and weight, etc., including ranges for each) herein may generally be approximated by changing (+) or (-) in increments of 0.1 or 1.0 as appropriate. All numerical designations are to be understood as being preceded by the term "about".

Example 1

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), acetic acid (0.1mol, 6.1g) and 28.0g butanol, stir at 40°C until homogeneous, then add 56.3g of water to obtain the final drug 1.

Example 2

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), mercaptoacetic acid (0.1mol, 9.2g) and 32.0g ethylene glycol, stir at 40°C until homogeneous, then add 63.0g of water to obtain Final potion 2.

Example 3

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), p-toluenesulfonic acid (0.1mol, 17.2g) and 40.0g isopropanol, stir at 40°C until homogeneous, then add 80.0 g of water g, the final drug 3 was obtained.

Example 4

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-ethylimidazole (0.1mol, 9.6g), thioglycolic acid (0.1mol, 9.2g) and 18.8g butanol, stir at 40°C until homogeneous, then add 37.6g of water to obtain the final drug 4 .

Example 5

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), mercaptoacetic acid (0.1mol, 9.2g) and 32.0g ethylene glycol, stir at 40°C until homogeneous, then add 14.2g iodomethane, 60°C Stir for 4 hours, and then add 78.0 g of water to obtain the final drug 5.

Example 6

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), phosphoric acid (0.1mol, 9.8g) and 32.0g of ethylene glycol, stir at 40°C until homogeneous, then add 14.2g of methyl iodide, at 60°C Stir for 4 hours, then add 78.0 g of water to obtain the final drug 6.

Example 7

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), sulfuric acid (0.1mol, 9.8g) and 32.0g ethylene glycol, stir at 40°C until homogeneous, add 7.7g of allyl chloride, stir at 60°C After 4 hours, 72.0 g of water was added thereafter to obtain the final drug 7.

Example 8

Present embodiment provides a kind of bactericidal corrosion inhibitor, it is made by following method:

Mix 2-undecylimidazole (0.1mol, 22.2g), acetic acid (0.1mol, 6.1g) and 28.0g butanol, stir at 40°C until homogeneous, add 7.7g of allyl chloride, stir at 60°C for 4h , and then add 64.0 g of water to obtain the final medicament 8.

Application example 1

In this application example, the bactericidal corrosion inhibitors obtained in Example 1-Example 8 are evaluated respectively. The specific evaluation process is:

Use agents 1-8 to conduct bactericidal tests on water samples containing SRB bacteria respectively. The concentration of bactericidal corrosion inhibitors is 100mg/L and 50mg/L. After adding bactericide to water samples containing SRB bacteria, incubate at 25°C in an anaerobic environment for 24 hours Finally, with reference to the SY/T 0532 oilfield injection water bacteria analysis method (extinct dilution method) to measure the bacterial content, calculate the bactericidal rate, the results are shown in Table 1, and the bactericidal rate calculation formula is as follows:

In the formula:

X - sterilization rate, %;

a ₂ - the number of bacteria after sterilization, pc/mL;

a ₁ - the number of blank bacteria, pc/mL.

Table 1

Bactericidal Corrosion Inhibitor	Test agent concentration, ppm	SRB bacteria amount, each	Sterilization rate, %
blank	-	2.5×10 2	-
potion 1	100	0	99.9
potion 2	100	0	99.9
potion 3	100	0	99.9
potion 4	100	0	99.9
potion 5	50	0	100.0
Potion 6	50	0	100.0
Potion 7	50	0	100.0
potion 8	50	0	100.0

As can be seen from Table 1, the bactericidal rate of medicament 1-medicine 4 in the embodiment is more than 99.9%, and the concentration of medicament 5-medicine 8 added with auxiliary agents in the embodiment has been reduced by one time, the bactericidal effect has been improved, and the bactericidal rate has reached 100%. It can be seen that the bactericidal corrosion inhibitor provided by the embodiment of the present invention has good bactericidal performance.

Application example 2

In this application example, the bactericidal corrosion inhibitors obtained in Example 1-Example 8 are evaluated respectively. The specific evaluation process is:

Use agents 1-8 to conduct corrosion tests on 5% sodium chloride water samples containing 500ppm CO ₂ respectively. The concentration of bactericidal corrosion inhibitor is 100mg/L, and the corrosion material is L360N. Refer to SY/T7437 Technical Requirements and Evaluation Methods for Corrosion Inhibitors for Natural Gas Gathering and Transportation, and calculate the corrosion rate. The results are shown in Table 2. The formula for calculating the corrosion rate is as follows:

In the formula:

Vc—uniform corrosion rate, in millimeters per year (mm/a);

m—weight loss of coupon, unit is gram (g);

s—the exposed area of the coupon, in square centimeters (cm ² );

t—experiment time, unit is hour (h);

ρ—the relative density of the coupon, in grams per cubic centimeter (g/cm ³ ).

Table 2

The bactericidal corrosion inhibitor that embodiment provides	Test agent concentration, ppm	Corrosion rate, mm/a
blank	-	0.3890
potion 1	100	0.0646
potion 2	100	0.0514
potion 3	100	0.0580
potion 4	100	0.0554
potion 5	100	0.0488
Potion 6	100	0.0660
Potion 7	100	0.0673
potion 8	100	0.0422

It can be seen from Table 2 that the corrosion rates of agents 1-8 are below 0.076mm/a. It can be seen that the bactericidal corrosion inhibitor provided by the embodiment of the present invention has good corrosion inhibition performance.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, they can also make It is not possible to exhaustively list all the implementation methods here, and all obvious changes or changes derived from the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims (24)

1. A bactericidal corrosion inhibitor, wherein, the bactericidal corrosion inhibitor comprises the following components by weight percentage: 10-90% of the compound of formula (I), 10-90% of the organic polar solvent, 0-20% of the auxiliary agent and the remainder of water;

   

   Among them, _R1 is selected from substituted or unsubstituted C1～C20 straight chain or branched chain alkyl, C1～C20 alkoxyl, substituted or unsubstituted C1～C20 straight chain or branched chain alkenyl, C1～C20 alkylthio One of radical, substituted or unsubstituted C3~C20 cycloalkyl, substituted or unsubstituted C6~C30 aryl, substituted or unsubstituted C2~C30 heteroaryl;

   _R2 is selected from H, substituted or unsubstituted C1~C20 straight chain or branched chain alkyl, C1~C20 alkoxy, substituted or unsubstituted C1~C20 straight chain or branched chain alkenyl, C1~C20 alkylthio One of radical, substituted or unsubstituted C3~C20 cycloalkyl, substituted or unsubstituted C6~C30 aryl, substituted or unsubstituted C2~C30 heteroaryl;

   X ^- is selected from COO ^- , SO ₃ ^- , H ₂ PO ₄ ^- or HSO ₄ ^- .
2. The fungicidal corrosion inhibitor according to claim 1, wherein, said _R is selected from substituted or unsubstituted C1～C20 straight chain or branched chain alkyl, substituted or unsubstituted C1～C20 straight chain or branched alkenes base.
3. The fungicidal corrosion inhibitor according to claim 2, wherein, said R ₁ is selected from substituted or unsubstituted C1～C20 linear or branched chain alkyl groups.
4. The fungicidal corrosion inhibitor according to claim 3, wherein, said R ₁ is selected from substituted or unsubstituted C6～C15 linear alkyl groups.
5. The bactericidal corrosion inhibitor according to claim 4, wherein, said R ₁ is a linear undecyl group.
6. The fungicidal corrosion inhibitor according to claim 1, wherein, R is selected from _one of H, substituted or unsubstituted C1～C20 straight chain or branched chain alkyl, substituted or unsubstituted C6～C30 aryl .
7. The fungicidal corrosion inhibitor according to claim 6, wherein, _R2 is selected from H, C1～C20 straight chain or branched chain alkyl, mercapto substituted C1～C20 straight chain or branched chain alkyl, alkyl substituted C6 One of ~C30 aryl groups.
8. Bactericidal corrosion inhibitor according to claim 7, wherein, R ₂ is H, methyl, mercaptomethyl or p-tolyl.
9. The fungicidal corrosion inhibitor according to claim 1, wherein the organic polar solvent comprises one or a combination of alcohols, amides, nitriles, pyridines, ketones, ethers and aromatic compounds .
10. The bactericidal corrosion inhibitor according to claim 9, wherein the organic polar solvent is selected from one or a combination of two or more alcohols.
11. The bactericidal corrosion inhibitor according to claim 10, wherein, the alcohols include methanol, ethanol, propanol, isopropanol, butanol, methyl ethanol, isobutanol, amyl alcohol, isoamyl alcohol, ethylene glycol , 2-methyl-1-butanol.
12. The bactericidal corrosion inhibitor according to claim 1, wherein the auxiliary agent comprises one or more combinations of thiourea, thiazole, silicone and derivatives thereof, halogenated alkanes, halogenated olefins and halogenated aromatics .
13. The bactericidal corrosion inhibitor according to claim 12, wherein the auxiliary agent is methyl iodide or allyl chloride.
14. The fungicidal corrosion inhibitor according to claim 1, wherein, the mass percentage of the compound of formula (I) is 20-25%, the mass percentage of the organic polar solvent is 20-30%, and the The mass percentage is 0-10%.
15. A preparation method of the bactericidal corrosion inhibitor described in any one of claims 1-14, wherein, the preparation method comprises the following steps:

    After the imidazole compound corresponding to R ₁ is reacted with the acid R ₂ -X in an organic polar solvent, an auxiliary agent is added to continue the reaction, and then water is added to obtain the bactericidal corrosion inhibitor.
16. The preparation method according to claim 15, wherein the acid is acetic acid, thioglycolic acid, p-toluenesulfonic acid, phosphoric acid or sulfuric acid.
17. The preparation method according to claim 15, wherein the reaction temperature of the imidazole compound and the acid R ₂ -X is 10-100°C.
18. The preparation method according to claim 15, wherein the reaction time between the imidazole compound and the acid R ₂ -X is 0.5-24 hours.
19. The preparation method according to claim 15, wherein the reaction temperature of the imidazole compound and the acid R ₂ -X is 20-80° C., and the time is 0.5-24 hours.
20. The preparation method according to claim 15, wherein the temperature for adding auxiliary agents to continue the reaction is 40-80° C., and the time is 2-8 hours.
21. The preparation method according to claim 15, wherein the molar ratio of the imidazole compound to the acid R ₂ -X is 1:(1-6).
22. The preparation method according to claim 15, wherein the mass percentage of the organic polar solvent in the reaction system is 10-90%.
23. The preparation method according to claim 15, wherein the mass percentage of the auxiliary agent in the reaction system is 0-20%.
24. The application of the bactericidal corrosion inhibitor described in any one of claims 1-14 in oil and gas field microbial corrosion protection or chemical corrosion protection.