CN112544624B - Special environment-friendly integrated sterilization corrosion inhibitor for shale gas pipeline and preparation method thereof - Google Patents
Special environment-friendly integrated sterilization corrosion inhibitor for shale gas pipeline and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of bactericidal corrosion inhibitors, and discloses a special environment-friendly integrated bactericidal corrosion inhibitor for shale gas pipelines and a preparation method thereof, wherein the bactericidal corrosion inhibitor comprises a main agent and a solvent, the solvent is ethanol or water, the main agent is composed of a bactericide and a corrosion inhibitor, the bactericide is composed of enrofloxacin and norfloxacin, and the corrosion inhibitor is one or two of three thiourea substances; the preparation method comprises the following steps: 1) adding a bactericide into the solvent, and stirring until the bactericide is completely dissolved; 2) and adding one or two of the three thiourea substances, and continuously stirring to obtain the bactericidal corrosion inhibitor. The main agent of the bactericidal corrosion inhibitor is compounded by the bactericide and the corrosion inhibitor, so the bactericidal corrosion inhibitor is non-toxic and free of pungent odor, the solvent is ethanol or water, the stability is good, the bactericidal corrosion inhibitor can be compatible with other auxiliary agents, other problems are avoided, the bactericidal corrosion inhibitor is harmless to people and livestock or the surrounding environment, the bactericidal corrosion inhibitor is safe and environment-friendly, and the bactericidal corrosion inhibition effect far exceeds the industrial standard and the commercially available products.
Description
Technical Field
The invention relates to the field of bactericidal corrosion inhibitors, and particularly relates to an environment-friendly integrated bactericidal corrosion inhibitor special for shale gas pipelines and a preparation method thereof.
Background
With the continuous development of oil and gas fields, the corrosion degree of the gathering and transportation process pipeline on the ground of the mining platform is increased continuously along with the increase of time. At present, metal materials applied in the shale gas exploitation and transportation pipeline environment face serious microbial corrosion, and according to statistics, the metal material corrosion related to microorganisms accounts for 70 to 80 percent of the total metal material corrosion, while in the shale gas collection and exploitation and transportation pipeline, the microbial corrosion is more serious. Sulfate Reducing Bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria (FB) are present in large quantities in shale gas pipelines, and these harmful bacterial microorganisms are the key cause of corrosion of pipelines. The corrosion of pipelines can cause serious problems of thinning of pipe walls, reduction of pressure bearing capacity, pipeline puncture, perforation and the like, thereby causing shale gas leakage, energy waste, environmental pollution, ecological damage and influencing the national civilian life. Statistically, energy consumption and loss due to microbial corrosion are as high as billions of dollars each year.
At present, most of bactericides mainly used for exploiting shale gas are surfactants such as quaternary ammonium salt quaternary phosphonium salt and the like, the foaming performance of the bactericides influences the gas exploitation efficiency, the color is deep, the smell is pungent, and the bactericides have influence on people, livestock and the environment. And long-term application can cause bacteria to generate drug resistance, the sterilization effect is gradually reduced, and the microbial corrosion is gradually serious, so that the service life of the shale gas pipeline is reduced.
Disclosure of Invention
The invention aims to provide a special environment-friendly integrated sterilization corrosion inhibitor for shale gas pipelines and a preparation method thereof, so as to solve the problem that the existing bactericide is not environment-friendly.
In order to achieve the purpose, the invention adopts the following technical scheme: the environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline comprises a main agent and a solvent, wherein the solvent is ethanol or water, the main agent is composed of a bactericide and a corrosion inhibitor, the bactericide is composed of enrofloxacin and norfloxacin, and the corrosion inhibitor is one or two of compounds represented by a formula (I), a formula (II) and a formula (III).
The principle and the advantages of the scheme are as follows:
(1) in the scheme, the main agent is formed by compounding a bactericide and a corrosion inhibitor, wherein the bactericide is composed of enrofloxacin and norfloxacin, the corrosion inhibitor is one or two of three thiourea substances (namely, the corrosion inhibitor is one or two of compounds represented by a formula (I), a formula (II) and a formula (III)), the bactericide and the corrosion inhibitor are nontoxic and have no pungent smell, and a solvent is ethanol or water.
Regarding the selection of the bactericide and corrosion inhibitor in the present embodiment, firstly, although the quinolone substance can be used as a broad-spectrum bactericide, the quinolone substance is not common as a bactericide on the shale gas pipeline, and not all quinolone substances can be used as a bactericide on the shale gas pipeline. According to the scheme, enrofloxacin and norfloxacin which have sterilization effects on Sulfate Reducing Bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria (FB) in shale gas pipelines are screened layer by layer. Secondly, due to the compatibility problem of the bactericide and the corrosion inhibitor, a plurality of bactericides with strong bactericidal performance cannot be used due to the incapability of being compatible with the corrosion inhibitor, and in the scheme, the enrofloxacin and the norfloxacin serving as the bactericide can be well compatible with three thiourea substances to form the stable ecological safety bactericidal corrosion inhibitor special for the shale gas pipeline, and flocculation precipitation cannot be generated.
(2) The sterilization and corrosion inhibition effect in the scheme is superior to that of a product sold on the market, and the main agent in the sterilization and corrosion inhibitor in the scheme is compounded by at least three substances, so that the drug resistance of microorganisms to single medicine can be reduced, and the sterilization and corrosion inhibition effect is improved.
Preferably, as an improvement, the mass ratio of the bactericide to the corrosion inhibitor to the solvent is 4-6:30-45: 100.
Has the advantages that: when the mass ratio of the bactericide to the corrosion inhibitor to the solvent is 4-6:30-45:100, the waste of the bactericide and the corrosion inhibitor caused by adding more bactericide and corrosion inhibitor is avoided on the premise of better sterilization and corrosion inhibition effects.
Preferably, as an improvement, the mass ratio of enrofloxacin to norfloxacin in the bactericide is 8:3 or 2:1 or 8: 1.
Has the advantages that: when the mass ratio of enrofloxacin to norfloxacin in the bactericide is 8:3, 2:1 or 8:1, the sterilizing effect is very good.
Preferably, as an improvement, the compound represented by the formula (I) is prepared by the following method:
1) putting a solvent and 1- (3-chloropropyl) thiourea into a round-bottom flask, adding triethylamine, and stirring at 0 ℃ for reaction;
2) dropwise adding N, N-2 methylbenzylamine into a round-bottom flask, and after dropwise adding, heating to 30 ℃ for reacting for 3 hours;
3) and (3) dropwise adding chlorobenzene into the round-bottom flask, and after dropwise adding, heating to 70 ℃ to react for 2 hours until a target product is obtained.
Has the advantages that: the preparation method of the compound represented by the formula (I) provided by the scheme has the advantages of simple synthetic route, simple and easily-purchased raw materials and controllable cost.
Preferably, as an improvement, the compound represented by the formula (ii) is prepared by:
1) putting a solvent and 1- (3-chloropropyl) thiourea into a round-bottom flask, adding pyridine, and stirring at 25 ℃ for reaction;
2) dropwise adding N, N-2 methylbenzylamine into a round-bottom flask, and after dropwise adding, heating to 45 ℃ for reacting for 3 hours;
3) dropwise adding 2-methyl chlorobenzene into the round-bottom flask, and after dropwise adding, heating to 80 ℃ to react for 2 hours to obtain a target product.
Has the advantages that: the preparation method of the compound represented by the formula (II) provided by the scheme has the advantages of simple synthetic route, simple and easily-purchased raw materials and controllable cost.
Preferably, as an improvement, the compound represented by the formula (iii) is prepared by:
1) putting a solvent and 1- (3-chloropropyl) thiourea into a round-bottom flask, adding sodium bicarbonate, and stirring at 30 ℃ for reaction;
2) dropwise adding N, N-2 methylbenzylamine into a round-bottom flask, and after dropwise adding, heating to 70 ℃ for reacting for 3 hours;
3) and (3) adding benzylamine dropwise into the round-bottom flask, and reacting for 2 hours after dropwise adding is finished to obtain the target product.
Has the advantages that: the preparation method of the compound represented by the formula (III) provided by the scheme has the advantages of simple synthetic route, simple and easily-purchased raw materials and controllable cost.
Preferably, as a modification, the dropping speed does not exceed 5 s/drop.
Has the advantages that: the dripping speed is limited not to exceed 5 s/drop in the scheme, so that the problem of excessive local dripping substances is avoided, and the reaction is more uniform and sufficient.
The invention also provides a preparation method of the special environment-friendly integrated sterilization corrosion inhibitor for the shale gas pipeline, which comprises the following steps:
s1, adding enrofloxacin and norfloxacin into the solvent, and stirring until the enrofloxacin and the norfloxacin are completely dissolved;
s2, slowly adding one or two of the compounds represented by the formula (I), the formula (II) and the formula (III), and continuously stirring to obtain the bactericidal corrosion inhibitor.
Has the advantages that: the preparation method of the bactericidal corrosion inhibitor in the scheme is simple, is easy for large-scale production, has low cost and has great application prospect.
Preferably, as a modification, in the step S1, the stirring speed is 500r/min, and the stirring time is 30 min; in the step S2, the stirring speed is 500r/min, and the stirring time is 60 min.
Has the advantages that: in the scheme, the stirring condition is limited, so that the main agent is fully mixed and compounded and dissolved in the solvent.
Preferably, as a modification, the steps S1 and S2 are performed at 30 ℃.
Has the advantages that: in the scheme, the stirring temperature is limited to 30 ℃, so that the main agent is better dissolved in the solvent.
Detailed Description
The following is further detailed by way of specific embodiments:
examples 1-10 are examples of the present invention, and the numbers and components of the shale gas pipeline dedicated environment-friendly integrated bactericidal corrosion inhibitor in each example are shown in table 1. Wherein "A1" represents "enrofloxacin", "A2" represents "norfloxacin", "B1" represents "thiourea-like substance represented by formula (I)", "B2" represents "thiourea-like substance represented by formula (II)", "B3" represents "thiourea-like substance represented by formula (III)", and "\\" represents "none".
The preparation method of B1 comprises the following steps:
1) putting 100 parts of solvent and 5 parts of 1- (3-chloropropyl) thiourea into a round-bottom flask, adding 1 part of triethylamine, and stirring for reaction at 0 ℃; the solvent is one of ethanol, methanol and dichloromethane.
2) 4 parts of N, N-2-methylbenzylamine is dropwise added into a round-bottom flask, and after the dropwise addition is finished, the temperature is raised to 30 ℃ for reaction for 3 hours.
3) 4 parts of chlorobenzene is dripped into a round-bottom flask, and after the dripping is finished, the temperature is raised to 70 ℃ to react for 2 hours to obtain a target product B1, wherein the structural formula of B1 is shown as the formula (I).
The dropping speed of N, N-2 methylbenzylamine and chlorobenzene was 5 s/drop.
The preparation method of B2 comprises the following steps:
1) putting 100 parts of solvent and 5 parts of 1- (3-chloropropyl) thiourea into a round-bottom flask, adding 1 part of pyridine, and stirring for reaction at 25 ℃; the solvent is one of ethanol, methanol and dichloromethane.
2) 4 parts of N, N-2-methylbenzylamine is dropwise added into a round-bottom flask, and after the dropwise addition is finished, the temperature is raised to 45 ℃ for reaction for 3 hours.
3) 4 parts of 2-methyl chlorobenzene is dripped into a round-bottom flask, and after the dripping is finished, the temperature is raised to 80 ℃ for reaction for 2 hours to obtain a target product B2, wherein the structural formula of B2 is shown as a formula (II).
The dropping rate of N, N-2-methylbenzylamine and 2-methylchlorobenzene was 5 s/drop.
The preparation method of B3 comprises the following steps:
1) putting 100 parts of solvent and 5 parts of 1- (3-chloropropyl) thiourea into a round-bottom flask, adding 0.5 part of sodium bicarbonate, and stirring at 30 ℃ for reaction; the solvent is one of ethanol, methanol and dichloromethane.
2) 4 parts of N, N-2-methylbenzylamine is dropwise added into a round-bottom flask, and after the dropwise addition is finished, the temperature is raised to 70 ℃ for reaction for 3 hours.
3) 4 parts of benzylamine is dripped into a round-bottom flask, and the target product B3 is obtained after the benzylamine is dripped and reacts for 2 hours, wherein the structural formula of B3 is shown as a formula (III).
The dropping speed of N, N-2-methylbenzylamine and benzylamine was 5 s/drop.
TABLE 1
The preparation method of the special environment-friendly integrated bactericidal corrosion inhibitor for the shale gas pipeline is described in detail by taking the example 1 as an example, and comprises the following steps:
step one, adding 0.5 part of enrofloxacin (A1) and 4 parts of norfloxacin (A2) into 100 parts of solvent under the stirring condition of 500r/min at 30 ℃, and stirring for 30min until the enrofloxacin (A1) and the norfloxacin (A2) are completely dissolved.
And step two, slowly adding 30 parts of thiourea substances (B1) shown in the formula (I), and continuously stirring for 60min to obtain the special environment-friendly integrated bactericidal corrosion inhibitor for the shale gas pipeline, wherein the serial number of the bactericidal corrosion inhibitor is LEPS-SJHS-1.
Comparative examples 1 to 16 were made with the existing bactericide 1227 (50%), glutaraldehyde (40%), THPS (80%), commercial quaternary phosphate bactericide, nalidixic acid, pyrric acid, cinoxacin, enoxacin, ofloxacin, lomefloxacin, tosufloxacin, fleroxacin, sparfloxacin, enrofloxacin, norfloxacin, enrofloxacin + norfloxacin (mass ratio 1:1), respectively.
To examine the bactericidal effect of the present invention, the bactericidal effect evaluation was performed on the bactericidal corrosion inhibitors of examples 1 to 10 and the bactericides of comparative examples 1 to 16, and evaluation tests were performed by the use of the sterilization dilution method. The water sample containing bacteria of the on-site flowback liquid of a certain shale gas production platform in Withania caerulea is adopted as the test water material, and the evaluation test of the bactericidal effect is explained in detail by taking the bactericidal effect evaluation test of the bactericidal corrosion inhibitor in the embodiment 1 as an example: 100mL of test water sample is taken, and the bactericidal corrosion inhibitor (LEPS-SJHS-1) in the example 1 is added into the test water sample, wherein the addition amount is 100 mg/L. After 1h, the bacterial concentration of the sterilized water body is tested by an extinct dilution method, the test temperature is 40 ℃, and the test time is 168 h. In each proportion, the addition amount of the bactericide in comparative examples 1 to 4 is added according to the optimal bactericidal concentration in the use instruction of each product, the optimal bactericidal concentration of the bactericide in comparative examples 1 to 4 is 100ppm, and the bactericide concentration in the test water sample after the bactericide is added in comparative examples 5 to 16 is 10 ppm.
Comparative example: taking 100mL of test water sample, adding no bactericidal corrosion inhibitor or bactericide, after 1h, testing the bacterial concentration of the sterilized water body by an extinct dilution method, wherein the testing temperature is 40 ℃, and the testing time is 168 h.
The calculation formula of the sterilization rate is as follows:
the results of evaluation of the bactericidal effect of examples 1 to 10 and comparative examples 1 to 15 are shown in table 2.
TABLE 2
As can be seen from Table 2, the bactericidal and corrosion-inhibiting agents of examples 1-10 exhibited a minimum bactericidal activity of 88.2% and a maximum bactericidal activity of 100% on SRB. Compared with the sterilization rate of the bactericide on the SRB in the comparative examples 1 to 4, the sterilization effect on the SRB in the examples 1 to 2 is not much different from that in the comparative examples 1 to 4, but the sterilization effect on the SRB in the examples 3 to 10 is obviously better than that in the comparative examples 1 to 4.
The bactericidal and corrosion-inhibiting agents of examples 1-10 gave TGB bactericidal rates of 94.5% minimum and 100% maximum. The sterilization rate of TGB in example 1 was 94.5%, and the sterilization rate of TGB in comparative examples 1 to 4 was the highest and 93.6% in comparative example 4, in other words, the lowest value of the sterilization rate of TGB in examples 1 to 10 was higher than the highest value of the sterilization rate of TGB in comparative examples 1 to 4.
The bactericidal and corrosion-inhibiting agents of examples 1-10 have a minimum bactericidal rate of 94.5% and a maximum bactericidal rate of 100% for FB. The sterilization rate for FB was 94.5% in example 2 and 94.8% at the highest in comparative examples 1 to 4, and it can be seen that the sterilization rate for FB was almost the same as the highest in comparative examples 1 to 4 in example 2, whereas the sterilization rates for FB were higher in examples 1, 3 to 10 than in comparative examples 1 to 4.
In conclusion, by comparing the sterilization rates of the examples 1 to 10 with the sterilization rates of the comparative examples 1 to 4, it can be easily found that the sterilization effect of the sterilization corrosion inhibitor of the invention on SRB, TGB and FB is equal to or even superior to that of the bactericides 1227 (50%), glutaraldehyde (40%), THPS (80%), and commercial quaternary phosphate bactericides, and the sterilization corrosion inhibitor of the invention is safe and environment-friendly, harmless to human and livestock and the surrounding environment, and more suitable for industrial use.
In addition, the sterilization rate for SRB was 0%, the sterilization rate for TGB was 0%, the sterilization rate for FB was 36.4% (comparative example 7, comparative example 9, comparative example 13), 77.3% (comparative example 12) and the sterilization effects for SRB, TGB and FB were all obtained in comparative examples 5 to 13 and 15. It is known that although quinolone substances act as broad-spectrum bactericides, not all quinolone substances can be used for shale gas pipeline sterilization. The enrofloxacin and norfloxacin are screened from the quinolone substances layer by layer, so that the SRB, TGB and FB which are key microorganisms causing shale gas pipeline corrosion are effectively sterilized, the shale gas pipeline corrosion is delayed, and the service life of the shale gas pipeline is prolonged.
Also, by comparing comparative examples 14 to 16, it was found that the bactericidal ratio for SRB, TGB and FB in comparative example 16 was higher than that for SRB, TGB and FB in comparative examples 14 and 15, indicating that the bactericidal effect of enrofloxacin and norfloxacin when used as a bactericide after mixing was better than that of enrofloxacin or norfloxacin alone.
In order to test the corrosion inhibition effect of the bactericidal corrosion inhibitor on shale gas pipelines, the high-temperature high-pressure autoclave is adopted to simulate the environment of an oil field gas collection system and is provided with simulated water to evaluate the corrosion inhibition effect of the bactericidal corrosion inhibitor in the examples 1-10.
Specifically, the coupon sample is placed into a corrosion inhibitor to be soaked for 5-10s, then the sample is removed and fixed on a test container bracket to prepare for a test.
The test conditions and the simulated water sample analysis results of the simulation test are shown in table 3, the hanging sample material is N80, and the test results are shown in table 4 under the condition that the test cycle is 7 days.
TABLE 3
TABLE 4
As shown in Table 4, the bactericidal corrosion inhibitor of the invention can reduce the corrosion inhibition rate of the N80 petroleum steel pipe to 0.01091mm/a, and the corrosion inhibition rate is as high as 97.54%. In addition, the highest value of the corrosion inhibition rate of the bactericidal corrosion inhibitor is only 0.03178mm/a, the corrosion inhibition rate is more than 92%, the corrosion inhibition effect far exceeds the industrial standard (the industrial standard: the corrosion inhibition rate is less than or equal to 0.076mm/a), the corrosion inhibition effect on shale gas pipelines can be improved, and the service life of the shale gas pipelines is prolonged. In addition, the sterilization corrosion inhibitor is safe and environment-friendly, has no harm to human beings, livestock and surrounding environment, and is more suitable for industrial use.
In order to examine the stability of the bactericidal corrosion inhibitor of the present invention, the state of the bactericidal corrosion inhibitor was observed after being left at 20 ℃, 40 ℃ and 80 ℃ for 24 hours, respectively, and the observation results are shown in table 5.
TABLE 5
As can be seen from Table 5, the bactericidal corrosion inhibitor of the present invention is a clear and transparent liquid, is colorless and odorless, has a stable state, does not generate discoloration, flocculation and precipitation under the condition of 80 ℃, and can maintain the original bactericidal corrosion inhibition performance after being placed for 24 hours.
In contrast experiments, after the bactericide 11-Q (methylisothiazolinone) and the corrosion inhibitor RX-1(IMC-508) are compounded, the mixture is placed at room temperature and 40 ℃ for 24 hours, and flocculation precipitation occurs. After the bactericide 11-Q (methylisothiazolinone) and the corrosion inhibitor RX-2(ZK-50) are compounded, the mixture is placed at room temperature and 40 ℃ for 24 hours, and flocculation precipitation occurs. This indicates that the compatibility of the bactericide 11-Q and the corrosion inhibitor RX-1 is not good, and the compatibility of the bactericide 11-Q and the corrosion inhibitor RX-2 is not good. In fact, the conventional bactericide is difficult to be stably compatible with a corrosion inhibitor, while enrofloxacin and norfloxacin are found as the bactericide by screening layer by layer, when three thiourea substances are used as the corrosion inhibitor, the compatibility of the two substances is good, and the compounded bactericidal corrosion inhibitor has good stability and cannot generate discoloration, flocculation and precipitation.
In conclusion, the bactericidal corrosion inhibitor can effectively kill SRB, TGB and FB in shale gas pipelines, has the bactericidal rate of 100 percent and the corrosion inhibition rate of 97.54 percent, has excellent bactericidal and corrosion inhibition effects, is non-toxic, free of pungent smell, good in stability, harmless to people, livestock and surrounding environment and has great application prospects.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. The environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline is characterized in that: the bactericide comprises enrofloxacin and norfloxacin, wherein the mass ratio of enrofloxacin to norfloxacin is 0.5:4 or 1:5 or 1.5:4 or 2:4 or 3:3 or 4:2 or 4:1.5 or 4:1 or 4.5: 0.5; the corrosion inhibitor is one or two of compounds represented by a formula (I) and a formula (II);
2. the environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline as claimed in claim 1, wherein: a compound represented by the formula (I) is prepared by the following method:
1) putting a solvent and 1- (3-chloropropyl) thiourea into a round-bottom flask, adding triethylamine, and stirring at 0 ℃ for reaction;
2) dropwise adding N, N-2 methylbenzylamine into a round-bottom flask, and after dropwise adding, heating to 30 ℃ for reacting for 3 hours;
3) and (3) dropwise adding chlorobenzene into the round-bottom flask, and after dropwise adding, heating to 70 ℃ to react for 2 hours to obtain a target product.
3. The environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline as claimed in claim 1, wherein: the compound represented by the formula (II) is prepared by the following method:
1) putting a solvent and 1- (3-chloropropyl) thiourea into a round-bottom flask, adding pyridine, and stirring at 25 ℃ for reaction;
2) dropwise adding N, N-2 methylbenzylamine into a round-bottom flask, and after dropwise adding, heating to 45 ℃ for reacting for 3 hours;
3) dropwise adding 2-methyl chlorobenzene into the round-bottom flask, and after dropwise adding, heating to 80 ℃ to react for 2 hours to obtain a target product.
4. The environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline as claimed in claim 2, wherein: the dripping speed of the N, N-2 methylbenzylamine and the chlorobenzene does not exceed 5 s/drop.
5. The environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline as claimed in claim 3, wherein: the dripping speed of the N, N-2-methylbenzylamine and the 2-methyl chlorobenzene does not exceed 5 s/drop.
6. The preparation method of the environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline as claimed in claim 1, characterized in that: the method comprises the following steps:
s1, adding enrofloxacin and norfloxacin into the solvent, and stirring until the enrofloxacin and the norfloxacin are completely dissolved;
s2, slowly adding one or two of the compounds represented by the formula (I) and the formula (II), and continuously stirring to obtain the bactericidal corrosion inhibitor.
7. The preparation method of the environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline according to claim 6, characterized in that: in the step S1, the stirring speed is 500r/min, and the stirring time is 30 min; in the step S2, the stirring speed is 500r/min, and the stirring time is 60 min.
8. The preparation method of the environment-friendly integrated sterilization corrosion inhibitor special for the shale gas pipeline according to claim 7, characterized in that: the steps S1 and S2 are performed at 30 ℃.
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