Acidification corrosion inhibitor that can resist high temperature of 190℃

Abstract

The present invention belongs to the technical field of oil and gas field chemistry, and specifically discloses an acidizing corrosion inhibitor capable of resisting a high temperature of 190°C. The acidizing corrosion inhibitor is prepared from the following raw materials in percentage by mass: 40%-44% of N-methylpyrrolidone, 18%-21% of N,N-dimethyllaurylamine, 23%-27% of 1-(iodomethyl)naphthalene, 23%-4% of Hyamine 162, and 9%-11% of dimethyldi(octadecyl)ammonium iodide. The preparation method thereof comprises the following steps: Step 1: weighing the raw materials according to the ratio, using N-methylpyrrolidone as a solvent, reacting N,N-dimethyllaurylamine with 1-(iodomethyl)naphthalene to generate dodecyldimethylnaphthalenemethylammonium iodide; Step 2: adding Hyamine 1622 and dimethyldi(octadecyl)ammonium iodide to the product obtained in Step 1 respectively, and stirring evenly to obtain an acidizing corrosion inhibitor capable of resisting a high temperature of 190°C.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field chemistry, and in particular relates to an acidizing corrosion inhibitor capable of resisting a high temperature of 190°C. Background Art

[0002] Acidizing is an important measure to increase the production of oil and gas wells by increasing the permeability of formation pores through acid corrosion and dissolution of rock cements and formation pores. During the acidizing process, the acid will corrode the pipelines and equipment in the oil well while corroding the formation. In order to reduce the corrosion of the equipment and pipelines by the acid, acidizing corrosion inhibitors must be added. The higher the temperature of the oil well environment, the higher the requirements for the effectiveness and stability of the corrosion inhibitor. The corrosion inhibitors currently available on the market can only effectively resist temperatures up to about 180°C. If the temperature is raised further, either the corrosion inhibition efficiency will be significantly reduced or the corrosion inhibition efficiency will be acceptable but the pitting phenomenon will be serious, which can easily cause perforation and damage to the oil well equipment. There is a lack of acidizing corrosion inhibitors that can be effectively used in a high temperature environment of 190°C. Summary of the invention

[0003] In view of the above shortcomings in the prior art, the present invention aims to provide an acidified corrosion inhibitor capable of withstanding high temperatures of 190°C and a preparation method thereof. The acidified corrosion inhibitor of the present invention has outstanding temperature resistance and basically does not cause pitting corrosion in a high temperature environment.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] An acidification corrosion inhibitor capable of resisting high temperature of 190°C is prepared from the following raw materials in percentage by mass: 40%-44% of N-methylpyrrolidone, 18%-21% of N,N-dimethyllaurylamine, 23%-27% of 1-(iodomethyl)naphthalene, 23%-4% of Hyamine 162, and 9%-11% of dimethyldi(octadecyl)ammonium iodide, wherein the mass ratio of N,N-dimethyllaurylamine to 1-(iodomethyl)naphthalene is (76-79):100. The preparation method thereof comprises the following steps:

[0006] Step 1: weigh the raw materials according to the ratio, use N-methylpyrrolidone as solvent, react N,N-dimethyllaurylamine with 1-(iodomethyl)naphthalene to generate dodecyldimethylnaphthylmethylammonium iodide;

[0007] Preferably, N,N-dimethyllaurylamine and 1-(iodomethyl)naphthalene are reacted at 75° C.-85° C. for 2.5 h-3.5 h to generate dodecyldimethylnaphthylmethylammonium iodide;

[0008] Step 2: Add Hyamine 1622 and dimethyldi(octadecyl)ammonium iodide to the product obtained in step 1 respectively, and stir evenly to obtain an acidified corrosion inhibitor capable of resisting high temperature of 190°C.

[0009] A method for preparing an acidified corrosion inhibitor capable of resisting high temperature of 190°C comprises the following steps:

[0010] Step 1: Weigh the raw materials according to the ratio, pour N-methylpyrrolidone into the reactor, start stirring, then add N,N-dimethyllaurylamine into the reactor and start heating. After stirring evenly, add 1-(iodomethyl)naphthalene when the temperature rises to 75-85°C, maintain the temperature at 75°C-85°C and react for 2.5h-3.5h to obtain a light yellow uniform transparent liquid, and lower the temperature;

[0011] Step 2: When the temperature drops to 45-50°C, add Hyamine 1622 to the reactor and maintain the temperature at 45-50°C, stir for 0.5h, then add dimethyldi(octadecyl)ammonium iodide, continue stirring for 1.0h-1.5h, and then cool to room temperature. The resulting colorless, slightly yellowish, uniform, transparent liquid is the acidification corrosion inhibitor that can withstand high temperatures of 190°C.

[0012] Furthermore, the stirring rate of step one is 120r-150r / min, and the stirring rate of step two is 80r-110r / min.

[0013] in:

[0014] (1) In step 1, N,N-dimethyllaurylamine and 1-(iodomethyl)naphthalene undergo quaternization reaction at a mass ratio of (76-79):100 to generate dodecyldimethylnaphthylmethylammonium iodide, and the reaction product is the main active ingredient of the high temperature corrosion inhibitor of the present application;

[0015] (2) N-methylpyrrolidone is mainly used as a solvent in this application, but it also has certain corrosion inhibition properties. It can also provide a catalytic effect on the quaternization reaction of N,N-dimethyllaurylamine and 1-(iodomethyl)naphthalene, and has a supporting role in the high-temperature corrosion inhibition performance of this application;

[0016] (3) Hyamine 1622 is a reinforcing agent component in the present application, which can enhance the film strength of dodecyl dimethylnaphthyl methyl ammonium iodide on the metal surface;

[0017] (4) Dimethyldioctadecylammonium iodide is used as a reinforcing agent in the present invention to improve the temperature resistance of the present invention and reduce the possibility of pitting corrosion.

[0018] The application of the acidizing corrosion inhibitor capable of resisting high temperature of 190°C comprises the following steps: it is applicable to the acidizing oil and gas well production enhancement operation construction of deep wells with a temperature not higher than 190°C, and the total amount of the acidizing corrosion inhibitor capable of resisting high temperature of 190°C is 1.5%-6.0% of the weight of the acid solution. The acid solution system added in the construction is hydrochloric acid or earth acid, the hydrochloric acid concentration in the hydrochloric acid solution is 15wt%-25wt%, the hydrochloric acid component in the earth acid solution is not higher than 18wt%, and the hydrofluoric acid component is not higher than 4wt%.

[0019] When the temperature of deep well is within 180℃, the usage of acidizing corrosion inhibitor is 1.5%-3.5%. When the temperature of deep well is between 180℃-190℃, the usage of acidizing corrosion inhibitor is 3.5%-6.0%.

[0020] It is precisely because of the adoption of the above-mentioned scheme that the main characteristics of the present invention are outstanding temperature resistance and basically no pitting corrosion in a high-temperature environment. The film adsorbed by this product on the metal surface is relatively dense and has high strength. When this product is used under the conditions of a temperature not higher than 190°C and a hydrochloric acid concentration not higher than 25%, basically no pitting corrosion will occur, and it can well meet the high-temperature corrosion inhibition requirements of an acidizing liquid system mainly composed of hydrochloric acid and earth acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a picture showing the effect of N80 steel sheet being corroded for 4 hours in a test system of 20wt% hydrochloric acid + 5wt% of the corrosion inhibitor sample prepared in Example 1 at a test temperature of 190°C (no pitting).

[0022] Figure 2 This is the effect diagram of N80 steel sheet after corrosion for 4 hours in the test system of 20wt% hydrochloric acid + 5wt% composite pyridine quaternary ammonium salt type high-temperature corrosion inhibitor sample, the test temperature is 190°C (pitting corrosion is more serious).

[0023] Figure 3 This is a picture showing the effect of N80 steel sheet being corroded for 4 hours in a test system of 20wt% hydrochloric acid + 5wt% of the corrosion inhibitor sample prepared in Example 7 at a test temperature of 190°C (the overall corrosion is more serious but the corrosion is more uniform). DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The present invention provides a technical solution: a high temperature resistant acidification corrosion inhibitor.

[0026] Embodiment 1:

[0027] The corrosion inhibitor is prepared from the following raw materials: 44 kg of N-methylpyrrolidone, 18 kg of N,N-dimethyllaurylamine, 23 kg of 1-(iodomethyl)naphthalene, 4 kg of Hyamine 1622, and 11 kg of dimethyldi(octadecyl)ammonium iodide, with a total weight of 100 kg.

[0028] Obtained as follows:

[0029] The raw materials were weighed according to the ratio, 44 ​​kg of N-methylpyrrolidone was poured into the reactor, and stirring was started at a speed of 130 r / min. Then, 18 kg of N, N-dimethyllaurylamine was added into the reactor and the temperature was raised. After stirring evenly, 23 kg of 1-(iodomethyl)naphthalene was added when the temperature rose to 75°C, and the temperature was maintained at 75°C-85°C to react for 3.0 hours to obtain a light yellow uniform transparent liquid, and the temperature was lowered; when the temperature dropped to 45°C, the stirring speed was lowered to 90 r / min, 4 kg of Hyamine 1622 was added to the reactor, and the temperature was maintained at 45-50°C, and stirred for 0.5 hours, and then 11 kg of dimethyldi(octadecyl)ammonium iodide was added, and stirring was continued for 1.5 hours, and then cooled to room temperature. The obtained colorless and slightly yellow uniform transparent liquid was the acidified corrosion inhibitor sample resistant to high temperature of 190°C.

[0030] Afterwards, the corrosion inhibition performance of the sample was tested. Unless otherwise specified, each embodiment was subjected to a dynamic corrosion evaluation experiment with reference to China's petroleum and natural gas industry standard SY / T 5405-2019 "Performance Test Method and Evaluation Index of Corrosion Inhibitors for Acidification". Brief description of the test process: In a high-temperature and high-pressure corrosion evaluation kettle, a group of two N80 steel sheets were immersed in 20wt% hydrochloric acid containing 5wt% corrosion inhibitor sample at 180℃ and 190℃, with a total pressure of 16MPa and a stirring speed of 60r / min for 4h, and another group of two N80 steel sheets were immersed in 12%wt hydrochloric acid + 3wt% hydrofluoric acid soil acid containing 6wt% corrosion inhibitor sample at 180℃ and 190℃, with a total pressure of 16MPa and a stirring speed of 60r / min for 4h, and the corrosion results of N80 steel sheets without adding corrosion inhibitor samples in the acid system at the same temperature were used as a control. Then the test pieces were taken out, cleaned and dried, and weighed, the dynamic corrosion rate and corrosion inhibition rate were calculated, and the presence of pitting corrosion was observed.

[0031] The test data of high temperature dynamic corrosion rate and corrosion inhibition rate of the corrosion inhibitor sample prepared in Example 1 are shown in Table 1 below:

[0032] Table 1

[0033]

[0034] The effect of N80 steel sheet after corrosion for 4 hours under the test system of 20wt% hydrochloric acid + 5wt% corrosion inhibitor prepared in Example 1 at a test temperature of 190°C is shown in the figure. Figure 1 , the results showed no pitting corrosion.

[0035] According to the above method, the SOL COR 180 pyridinium quaternary ammonium salt high temperature corrosion inhibitor sample of Solenon Chemical (Shanghai) Co., Ltd. on the market was also tested. The test data is shown in Table 2 below:

[0036] Table 2

[0037]

[0038]

[0039] N80 steel sheet was tested in 20wt% hydrochloric acid + 5wt% composite pyridine quaternary ammonium salt type high temperature corrosion inhibitor sample test system, the test temperature was 190℃, and the effect after corrosion for 4h was shown in the figure. Figure 2 , the results show that pitting corrosion is more serious.

[0040] Embodiment 2:

[0041] The corrosion inhibitor is prepared from the following raw materials: 40 kg of N-methylpyrrolidone, 21 kg of N,N-dimethyllaurylamine, 27 kg of 1-(iodomethyl)naphthalene, 3 kg of Hyamine 1622, 9 kg of dimethyldi(octadecyl)ammonium iodide, and the total weight of the above components is 100 kg.

[0042] Obtained as follows:

[0043] The raw materials were weighed according to the ratio, 40 kg of N-methylpyrrolidone was poured into the reactor, and stirring was started at a speed of 130 r / min. Then, 21 kg of N, N-dimethyllaurylamine was added into the reactor and the temperature was raised. After stirring evenly, 27 kg of 1-(iodomethyl)naphthalene was added when the temperature rose to 75°C, and the temperature was maintained at 75°C-85°C to react for 3.0 hours to obtain a light yellow uniform transparent liquid, and the temperature was lowered; when the temperature dropped to 45°C, the stirring speed was lowered to 90 r / min, 3 kg of Hyamine 1622 was added to the reactor, and the temperature was maintained at 45-50°C, and stirred for 0.5 hours, and then 9 kg of dimethyldi(octadecyl)ammonium iodide was added, and stirring was continued for 1.5 hours, and then cooled to room temperature. The obtained colorless and slightly yellow uniform transparent liquid was the acidified corrosion inhibitor sample resistant to high temperature of 190°C.

[0044] The high temperature dynamic corrosion rate test data of the corrosion inhibitor sample prepared in Example 2 is shown in Table 3 below:

[0045] Table 3

[0046]

[0047] Embodiment three:

[0048] The corrosion inhibitor is prepared from the following raw materials: 41 kg of N-methylpyrrolidone, 20 kg of N,N-dimethyllaurylamine, 26 kg of 1-(iodomethyl)naphthalene, 3 kg of Hyamine 1622, 10 kg of dimethyldi(octadecyl)ammonium iodide, and the total weight of the above components is 100 kg.

[0049] Obtained as follows:

[0050] The raw materials were weighed according to the ratio, 41 kg of N-methylpyrrolidone was poured into the reactor, and stirring was started at a speed of 130 r / min. Then, 20 kg of N, N-dimethyllaurylamine was added into the reactor and the temperature was raised. After stirring evenly, 26 kg of 1-(iodomethyl)naphthalene was added when the temperature rose to 75°C, and the temperature was maintained at 75°C-85°C to react for 3.0 hours to obtain a light yellow uniform transparent liquid, and the temperature was lowered; when the temperature dropped to 45°C, the stirring speed was lowered to 90 r / min, 3 kg of Hyamine 1622 was added to the reactor, and the temperature was maintained at 45-50°C, and stirred for 0.5 hours, and then 10 kg of dimethyldi(octadecyl)ammonium iodide was added, and stirring was continued for 1.5 hours, and then cooled to room temperature. The obtained colorless and slightly yellow uniform transparent liquid was the acidified corrosion inhibitor sample resistant to high temperature of 190°C.

[0051] The high temperature dynamic corrosion rate test data of the corrosion inhibitor sample prepared in Example 3 is shown in Table 4 below:

[0052] Table 4

[0053]

[0054] Embodiment 4:

[0055] The corrosion inhibitor is prepared from the following raw materials: 41 kg of N-methylpyrrolidone, 20 kg of N,N-dimethyllaurylamine, 26 kg of 1-(iodomethyl)naphthalene, 10 kg of dimethyldi(octadecyl)ammonium iodide, and the total weight of the above components is 97 kg.

[0056] Obtained as follows:

[0057] The raw materials were weighed according to the ratio, 41 kg of N-methylpyrrolidone was poured into the reactor, and stirring was started at a speed of 130 r / min. Then, 20 kg of N, N-dimethyllaurylamine was added into the reactor and the temperature was raised. After stirring evenly, 26 kg of 1-(iodomethyl)naphthalene was added when the temperature rose to 75°C, and the temperature was maintained at 75°C-85°C to react for 3.0 hours to obtain a light yellow uniform transparent liquid, and the temperature was lowered; when the temperature dropped to 45°C, the stirring speed was lowered to 90 r / min, 10 kg of dimethyldi(octadecyl)ammonium iodide was added to the reactor, and the temperature was maintained at 45-50°C, stirred for 1.5 hours, and then cooled to room temperature. The obtained colorless and slightly yellow uniform transparent liquid was the high temperature resistant acidification corrosion inhibitor sample.

[0058] The high temperature dynamic corrosion rate test data of the corrosion inhibitor sample prepared in Example 4 is shown in Table 5 below:

[0059] Table 5

[0060]

[0061] Compared with Example 3, Hyamine 1622 was not added to the acidified corrosion inhibitor sample prepared in Example 4, and the corrosion rate increased relatively significantly, especially under the test conditions of 190°C, and a relatively slight pitting phenomenon also occurred at 190°C. The reason is that Hyamine 1622 can form coordination bonds on the metal surface to enhance the film strength of the corrosion inhibitor on the metal surface. In a temperature environment of 180°C, the acidified corrosion inhibition application requirements can be met without adding Hyamine 1622.

[0062] Embodiment five:

[0063] The corrosion inhibitor is prepared from the following raw materials: 41 kg of N-methylpyrrolidone, 20 kg of N,N-dimethyllaurylamine, 26 kg of 1-(iodomethyl)naphthalene, 16223 kg of Hyamine, and the total weight of the above components is 90 kg.

[0064] Obtained as follows:

[0065] Weigh the raw materials according to the ratio, pour 41kg N-methylpyrrolidone into the reactor, start stirring at a speed of 130r / min, then add 20kg N,N-dimethyllaurylamine into the reactor and start heating. After stirring evenly, add 26kg 1-(iodomethyl)naphthalene when the temperature rises to 75°C, maintain the temperature at 75°C-85°C to react for 3.0h to obtain a light yellow uniform transparent liquid, and lower the temperature; when the temperature drops to 45°C, reduce the stirring speed to 90r / min, add 3kg Hyamine 1622 to the reactor, maintain the temperature at 45-50°C, stir for 1.0h, and then cool to room temperature. The obtained light yellow uniform transparent liquid is the high temperature resistant acidifying corrosion inhibitor sample.

[0066] The high temperature dynamic corrosion rate test data of the corrosion inhibitor sample prepared in Example 5 is shown in Table 6 below:

[0067] Table 6

[0068]

[0069]

[0070] Compared with Example 3, dimethyldi(octadecyl)ammonium iodide was not added to the acidified corrosion inhibitor sample prepared in Example 5, and the corrosion rate increased significantly and the pitting phenomenon became significantly more serious, and the effect of using it in an acidified environment of 180°C was not very good. It is speculated that on the one hand, dimethyldi(octadecyl)ammonium iodide can provide iodine ions that are beneficial to high-temperature corrosion inhibition to the system, and on the other hand, it has a long hydrocarbon chain and has good affinity with the main active ingredient of the present application, dodecyldimethylnaphthylmethylammonium iodide, through synergistic film-forming effect, so that the film formed by the corrosion inhibitor on the metal surface is more uniform and dense, thereby reducing the corrosion rate and inhibiting the pitting phenomenon.

[0071] Embodiment six:

[0072] The corrosion inhibitor is made from the following raw materials: 41 kg of N-methylpyrrolidone, 20 kg of N,N-dimethyllaurylamine, 26 kg of 1-(iodomethyl)naphthalene, and 87 kg of the total of the above components. The difference between Example 6 and Example 3 is that dimethyldi(octadecyl)ammonium iodide and Hyamine 1622 are not added to observe the effect of removing the corrosion inhibitor on the present application.

[0073] Obtained as follows:

[0074] Weigh the raw materials according to the ratio, pour 41kg of N-methylpyrrolidone into the reactor, start stirring at a speed of 130r / min, then add 20kg of N,N-dimethyllaurylamine into the reactor and start heating. After stirring evenly, add 26kg of 1-(iodomethyl)naphthalene when the temperature rises to 75°C, maintain the temperature at 75°C-85°C to react for 3.0h to obtain a light yellow uniform transparent liquid, and then cool to room temperature. The obtained light yellow uniform transparent liquid is the high temperature resistant acidifying corrosion inhibitor sample.

[0075] The dynamic corrosion rate of Example 6 was tested at 160° C. and 170° C. The dynamic corrosion evaluation experiment was conducted with reference to the Chinese petroleum and natural gas industry standard SY / T 5405-2019 "Performance Test Method and Evaluation Index of Corrosion Inhibitors for Acidification". Brief description of the test process: In a high-temperature and high-pressure corrosion evaluation kettle, a group of two N80 steel sheets were immersed in 20wt% hydrochloric acid containing 4wt% corrosion inhibitor sample at 160℃ and 170℃, with a total pressure of 16MPa and a stirring speed of 60r / min for 4h, and another group of two N80 steel sheets were immersed in 12%wt hydrochloric acid + 3wt% hydrofluoric acid soil acid containing 5wt% corrosion inhibitor sample at 160℃ and 170℃, with a total pressure of 16MPa and a stirring speed of 60r / min for 4h, and the corrosion results of N80 steel sheets without adding corrosion inhibitor samples in the acid solution system at the same temperature were used as a control. Then the test pieces were taken out, cleaned and dried, and weighed, the dynamic corrosion rate was calculated, and the presence of pitting corrosion was observed.

[0076] The high temperature dynamic corrosion rate test data of the corrosion inhibitor sample prepared in Example 6 is shown in Table 7 below:

[0077] Table 7

[0078]

[0079] The sample prepared in Example 6 can well meet the acidification corrosion inhibition requirement at 160°C, but the corrosion rate is too high at 170°C to meet the acidification corrosion inhibition requirement.

[0080] Embodiment seven:

[0081] The corrosion inhibitor is prepared from the following raw materials: 44 kg of N-methylpyrrolidone, 41 kg of dodecyl dimethyl benzyl ammonium iodide, 4 kg of Hyamine 1622, 11 kg of dimethyl di(octadecyl) ammonium iodide, and the total weight of the above components is 100 kg.

[0082] Obtained as follows:

[0083] Weigh the raw materials according to the ratio, pour 44kg N-methylpyrrolidone into the reactor, start stirring at a speed of 130r / min, start heating and wait until the temperature rises to 45°C, and maintain the temperature at 45-50°C, then add 41kg dodecyldimethylbenzylammonium iodide into the reactor, stir to form a uniform liquid without solid phase, then add 4kg Hyamine 1622 to the reactor, stir for 0.5h, then add 11kg dimethyldi(octadecyl)ammonium iodide, continue stirring for 1.5h, and then cool to room temperature to obtain a light yellow transparent liquid sample, which is the high temperature resistant acidification corrosion inhibitor sample.

[0084] The high temperature dynamic corrosion rate test data of the corrosion inhibitor sample prepared in Example 7 is shown in Table 8 below:

[0085] Table 8

[0086]

[0087]

[0088] Compared with Example 1, the acidified corrosion inhibitor sample prepared by Example 7 using dodecyl dimethyl benzyl ammonium iodide instead of dodecyl dimethyl naphthyl methyl ammonium iodide can basically meet the acidified corrosion inhibition requirements within 180°C, and the corrosion rate is very high at 190°C and cannot meet the corrosion inhibition requirements. Overall, the corrosion rate is significantly higher than that of the steel sheet of Example 1 sample, but this example can also achieve a more uniform corrosion effect of N80 steel sheet under high temperature conditions of 190°C, indicating that it can still play a certain inhibitory role on pitting corrosion. It is speculated that the reason is that naphthalene has a stronger electron donation ability than benzene and is more easily adsorbed on the metal surface, so the film strength of dodecyl dimethyl naphthyl methyl ammonium iodide is higher than that of dodecyl dimethyl benzyl ammonium iodide.

[0089] The effect of N80 steel sheet after corrosion for 4 hours under the test system of 20wt% hydrochloric acid + 5wt% corrosion inhibitor prepared in Example 7 at a test temperature of 190°C is shown in the figure. Figure 3 The results showed that there was basically no pitting corrosion.

[0090] According to the tests of multiple groups of example samples, the compounding of dodecyl dimethyl naphthyl methyl ammonium iodide, Hyamine 1622 and dimethyl di(octadecyl) ammonium iodide in the present application can meet the requirements of acidification corrosion inhibition at 190°C.

[0091] The above description of the embodiments is to facilitate the understanding and use of the present invention by those of ordinary skill in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the principles of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An acidification corrosion inhibitor capable of resisting high temperature of 190°C, characterized in that: The invention is prepared from the following raw materials in percentage by weight: 40%-44% N-methylpyrrolidone, 18%-21% N,N-dimethyllaurylamine, 23%-27% 1-(iodomethyl)naphthalene, 3%-4% Hyamine1622, 9%-11% dimethyldi(octadecyl)ammonium iodide, wherein the mass ratio of N,N-dimethyllaurylamine to 1-(iodomethyl)naphthalene is (76-79):

100. The preparation method comprises the following steps: Step 1: weigh the raw materials according to the ratio, use N-methylpyrrolidone as solvent, react N,N-dimethyllaurylamine with 1-(iodomethyl)naphthalene to generate dodecyldimethylnaphthylmethylammonium iodide; Step 2: Add Hyamine 1622 and dimethyldi(octadecyl)ammonium iodide to the product obtained in step 1 respectively, and stir evenly to obtain an acidification corrosion inhibitor capable of resisting high temperature of 190°C.

2. The acidification corrosion inhibitor capable of resisting high temperature of 190°C according to claim 1, characterized in that: N,N-dimethyllaurylamine reacts with 1-(iodomethyl)naphthalene at 75°C-85°C for 2.5h-3.5h to generate dodecyldimethylnaphthylmethylammonium iodide.

3. The method for preparing an acidified corrosion inhibitor capable of resisting high temperature of 190° C. according to claim 1, characterized in that: The steps include: Step 1: Weigh the raw materials according to the ratio, pour N-methylpyrrolidone into the reactor, start stirring, then add N,N-dimethyllaurylamine into the reactor and start heating. After stirring evenly, add 1-(iodomethyl)naphthalene when the temperature rises to 75-85°C, maintain the temperature at 75°C-85°C and react for 2.5h-3.5h to obtain a light yellow uniform transparent liquid, and lower the temperature; Step 2: When the temperature drops to 45-50°C, add Hyamine 1622 to the reactor and maintain the temperature at 45-50°C. Stir for 0.5h, then add dimethyldi(octadecyl)ammonium iodide, continue stirring for 1.0h-1.5h, and then cool to room temperature. The resulting colorless, slightly yellowish, uniform, transparent liquid is the acidification corrosion inhibitor that can withstand high temperatures of 190°C.

4. The method for preparing an acidified corrosion inhibitor capable of resisting high temperature of 190°C as claimed in claim 3, characterized in that: The stirring rate of step one is 120r-150r / min.

5. The method for preparing an acidified corrosion inhibitor capable of resisting high temperature of 190°C as claimed in claim 4, characterized in that: The stirring rate of step 2 is 80r-110r / min.

6. Use of the acidified corrosion inhibitor capable of resisting high temperature of 190°C as described in any one of claims 1-2 or the acidified corrosion inhibitor capable of resisting high temperature of 190°C prepared by the preparation method as described in any one of claims 3-5, characterized in that: The method comprises the following steps: being applicable to the acidizing oil and gas well production enhancement operation in deep wells with a temperature not higher than 190°C, and adding the above acidizing corrosion inhibitor capable of resisting high temperature of 190°C in an amount of 1.5%-6.0% of the weight of the acid solution.

7. The use according to claim 6, characterized in that: The acid solution system added during construction is hydrochloric acid or earth acid, the hydrochloric acid concentration in the hydrochloric acid solution is 15wt%-25wt%, the hydrochloric acid component in the earth acid solution is not higher than 18wt%, and the hydrofluoric acid component is not higher than 4wt%.

8. The use according to claim 6, characterized in that: When the deep well temperature is within 180℃, the usage of acidizing corrosion inhibitor is 1.5%-3.5%. When the deep well temperature is between 180℃-190℃, the usage of acidizing corrosion inhibitor is 3.5%-6.0%.

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