A corrosion inhibition and viscosity reduction composition and its preparation method and application

Abstract

The present invention provides a corrosion-inhibiting and viscosity-reducing composition, its preparation method, and application. The composition comprises an imidazoline compound, a parahydroxybenzoate compound, dimethyl carbonate, and polyacrylic acid, and maleic acid and a solvent. It is a corrosion inhibitor with both viscosity-reducing properties. The preparation method is simple, the raw materials are readily available, and the composition exhibits both viscosity-reducing and corrosion-inhibiting properties, making it suitable for application in oilfield corrosion protection.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield corrosion prevention, and in particular relates to a corrosion inhibition and viscosity reduction composition, a preparation method and an application thereof. Background Art

[0002] As a highly efficient strategic resource, oil plays a vital role in people's lives and national development. With the development of society and advancements in science and technology, people's demand for oil continues to rise. This has led to a continuous increase in oil consumption in my country in recent years, a rapid decline in oil reserves, and a resulting increase in oil production year by year.

[0003] Crude oil, especially heavy oil, is characterized by high viscosity and poor flow, severely restricting its extraction and transportation. This characteristic necessitates that heavy oil extraction, transportation, and refining must be centered around viscosity reduction, pour point reduction, or modification. Adding a viscosity reducer offers advantages such as simplicity and low cost, making it a promising method for viscosity reduction.

[0004] Diluting is a widely used process for heavy oil recovery. This process uses distillate, thin crude oil, or other organic solvents as diluents, which are injected into the wellbore and mixed with the heavy oil, significantly reducing its viscosity and improving its fluidity, making it recoverable. According to existing research, crude oil viscosity typically must be below 4,000 mPa·s to be viable for recovery and transportation. For some extra-heavy and ultra-heavy oils, such as Tahe heavy oil, the viscosity often exceeds 50,000 mPa·s, requiring the addition of large amounts of diluent to achieve the viscosity required for normal production. Diluent dosage is a key indicator of the economic viability of heavy oil recovery. Research on oil-soluble viscosity reducers aimed at reducing diluent usage has been extensive, but has largely been limited to laboratory research and field trials. Industrial production requires oil-soluble viscosity reducers to have high replacement efficiency, requiring the addition of small amounts of diluent to replace large amounts of diluent. However, most reported oil-soluble viscosity reducers fail to meet these requirements.

[0005] Currently, there are two main approaches to addressing oilfield corrosion: changing the material of oil and gas well tubing to make it corrosion-resistant or lining it with corrosion-resistant tubing; and using corrosion inhibitors. In practice, the use of corrosion-resistant tubing is costly and can still cause pitting and cavitation, rendering the strength of the tubing insufficient for production needs within its safe service life. While corrosion inhibitors are widely used, those that can withstand high temperatures in highly mineralized environments are rare.

[0006] There are many types of corrosion inhibitors and viscosity reducers currently used in industry. Using corrosion inhibitors and viscosity reducers simultaneously for the purpose of corrosion prevention and viscosity reduction will lead to problems such as reduced corrosion inhibition and viscosity reduction effects and increased costs. It can be seen that developing multifunctional crude oil additives with viscosity reduction, corrosion inhibition, and pour point reduction functions to further reduce costs and simplify process flows is the future development direction. Summary of the Invention

[0007] The purpose of the present invention is to provide a corrosion-inhibiting and viscosity-reducing composition, a preparation method thereof, and an application thereof. The corrosion-inhibiting and viscosity-reducing composition has strong solubility and dispersibility in crude oil, and has both corrosion inhibition performance and viscosity reduction effect, so as to solve the above-mentioned problems existing in the prior art.

[0008] To achieve the above objectives, the first aspect of the present invention provides a corrosion inhibition and viscosity reduction composition comprising an imidazoline compound, a parahydroxybenzoate compound, dimethyl carbonate and polyacrylic acid.

[0009] In a specific embodiment of the present invention, the corrosion inhibition and viscosity reduction composition further comprises maleic acid and a solvent;

[0010] Preferably, the solvent is a lower alcohol;

[0011] Preferably, the lower alcohol is ethanol.

[0012] In a specific embodiment of the present invention, based on the mass of the corrosion inhibition and viscosity reduction composition, the corrosion inhibition and viscosity reduction composition comprises:

[0013]

[0014] Preferably, the corrosion inhibition and viscosity reduction composition comprises:

[0015]

[0016] In a specific embodiment of the present invention, the imidazoline compound is selected from at least one of aminoethyl heptadecenyl imidazoline, imidazoline ester and lauryl imidazoline.

[0017] In a specific embodiment of the present invention, the imidazoline compound is lauryl imidazoline.

[0018] In a specific embodiment of the present invention, the parahydroxybenzoic acid ester compound is selected from at least two of methyl parahydroxybenzoate, ethyl parahydroxybenzoate and propyl parahydroxybenzoate.

[0019] In one embodiment of the present invention, the parahydroxybenzoate compound is a mixture of methyl parahydroxybenzoate and ethyl parahydroxybenzoate;

[0020] Preferably, the molar ratio of methyl parahydroxybenzoate to ethyl parahydroxybenzoate is 1:0.8.

[0021] In one embodiment of the present invention, the weight average molecular weight of the polyacrylic acid is 3000 to 5000;

[0022] Preferably, the weight average molecular weight of the polyacrylic acid is 5000.

[0023] The second aspect of the present invention provides a method for preparing the corrosion-inhibiting and viscosity-reducing composition according to the first aspect of the present invention, comprising the following steps:

[0024] The imidazoline compound, the p-hydroxybenzoate compound, dimethyl carbonate and polyacrylic acid are mixed, heated and cooled to obtain the corrosion inhibition and viscosity reduction composition.

[0025] In a specific embodiment of the present invention, the imidazoline compound, the p-hydroxybenzoate compound, dimethyl carbonate, polyacrylic acid, maleic acid and a solvent are mixed, and then the heating is performed;

[0026] Preferably, the heating temperature is 80°C to 90°C; and / or

[0027] The cooling is cooling to room temperature (i.e., 25° C.);

[0028] Preferably, the heating temperature is 85°C.

[0029] Application of the corrosion-inhibiting and viscosity-reducing composition according to the first aspect of the present invention or the corrosion-inhibiting and viscosity-reducing composition prepared by the method according to the second aspect of the present invention in the field of oilfield corrosion protection technology, especially as a corrosion inhibitor with viscosity-reducing effect.

[0030] Beneficial effects of the present invention:

[0031] To address the lack of corrosion inhibitors with simultaneous viscosity reduction in the prior art, and the high cost and poorer effectiveness of using both common corrosion inhibitors and viscosity reducers for both viscosity reduction and corrosion inhibition, the present invention provides a corrosion-inhibiting and viscosity-reducing composition, its preparation method, and its application. The corrosion-inhibiting and viscosity-reducing composition comprises, first, an imidazoline compound, a parahydroxybenzoate compound, dimethyl carbonate, and polyacrylic acid, and secondly, maleic acid and a solvent, resulting in a corrosion inhibitor with both viscosity reduction and corrosion inhibition. The corrosion inhibition and viscosity reduction composition provided by the present invention has strong solubility and dispersibility in crude oil, and the imidazoline compound, the paraben compound, the polyacrylic acid and the dimethyl carbonate synergize in terms of viscosity reduction and corrosion inhibition performance, and simultaneously achieve good viscosity reduction effect and corrosion inhibition performance: at 80°C, 50°C and 20°C, when the amount of the corrosion inhibition and viscosity reduction composition added is 0.3wt% of the mass of the heavy oil (viscosity at 50°C is 16800mP.s), the viscosity reduction rate of the heavy oil is 29% to 35%, 46% to 48% and 60% to 62% respectively; at crude oil (viscosity at 30°C is 57mP.s) and heavy oil (viscosity at 30°C is 57mP.s), the viscosity reduction rate of the heavy oil is 29% to 35%, 46% to 48% and 60% to 62% respectively. In a corrosive medium obtained by mixing a mixture of 16800 mP.s (viscosity at 50°C) and injection water with a salinity of 210,000 mg / L in a mass ratio of 1:1:0.7, when the corrosion-inhibiting and viscosity-reducing composition was added at a dosage of 0.3 wt%, the corrosion rate of an N80 steel sheet in the corrosive medium containing the corrosion-inhibiting and viscosity-reducing composition was 0.034 to 0.046 mm / a. The corrosion inhibition rate of the corrosion-inhibiting and viscosity-reducing composition provided by the present invention on the N80 steel sheet was 73.41% to 80.35%. Compared with the corrosive medium without the corrosion-inhibiting and viscosity-reducing composition, the degree of corrosion of the N80 steel sheet in the corrosive medium containing the corrosion-inhibiting and viscosity-reducing composition was significantly reduced. The preparation method of the corrosion-inhibiting and viscosity-reducing composition is simple, the raw materials are readily available, and it can be widely promoted and applied as a corrosion inhibitor with viscosity-reducing effect in the field of oilfield corrosion protection technology. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to examples. However, the examples are merely illustrative and do not limit the present invention in any way.

[0033] Preparation of corrosion inhibition and viscosity reduction composition

[0034] The polyacrylic acid used in Examples 1 to 3 has a weight-average molecular weight of 5000 and was purchased from Shanghai Haohong Biopharmaceutical Technology Co., Ltd.

[0035] The lauryl imidazoline used in Examples 1 to 3 was purchased from Shandong Qixinyuan New Material Technology Co., Ltd.

[0036] Example 1

[0037] 10 g of lauryl imidazoline, 2 g of a mixture of methyl parahydroxybenzoate and ethyl parahydroxybenzoate (wherein the molar ratio of methyl parahydroxybenzoate to ethyl parahydroxybenzoate is 1:0.8), 1 g of dimethyl carbonate, 1 g of polyacrylic acid, 4 g of maleic acid and 20 g of ethanol were mixed, heated to 85° C., and cooled to room temperature (25° C.) while stirring to obtain a corrosion inhibition and viscosity reduction composition, which is a corrosion inhibitor with both viscosity reduction effect.

[0038] Example 2

[0039] 12 g of lauryl imidazoline, 4 g of a mixture of methyl parahydroxybenzoate and ethyl parahydroxybenzoate (wherein the molar ratio of methyl parahydroxybenzoate to ethyl parahydroxybenzoate is 1:0.8), 3 g of dimethyl carbonate, 3 g of polyacrylic acid, 6 g of maleic acid and 25 g of ethanol were mixed, heated to 85° C., and cooled to room temperature (25° C.) while stirring to obtain a corrosion inhibition and viscosity reduction composition, which is a corrosion inhibitor with both viscosity reduction effect.

[0040] Example 3

[0041] 15 g of lauryl imidazoline, 6 g of a mixture of methyl parahydroxybenzoate and ethyl parahydroxybenzoate (wherein the molar ratio of methyl parahydroxybenzoate to ethyl parahydroxybenzoate is 1:0.8), 3 g of dimethyl carbonate, 5 g of polyacrylic acid, 8 g of maleic acid and 30 g of ethanol were mixed, heated to 85° C., and cooled to room temperature (25° C.) while stirring to obtain a corrosion inhibition and viscosity reduction composition, which is a corrosion inhibitor with both viscosity reduction effect.

[0042] Experimental evaluation

[0043] 1. Evaluation of the viscosity reduction performance of the corrosion inhibition and viscosity reduction composition at room temperature

[0044] The viscosity of crude oil and heavy oil and the salinity of injected water used in this experiment are as follows:

[0045] Crude oil: viscosity at 30°C is 57 mPa.s;

[0046] Heavy oil: viscosity at 50°C is 16800 mPa.s;

[0047] Injection water: oilfield produced water with a salinity of 210,000 mg / L.

[0048] The viscosity reducing performance of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 was evaluated at room temperature. The specific method is as follows:

[0049] i. Preparation of the test solution: crude oil, heavy oil and injection water were mixed uniformly to obtain the test solution (wherein the mass ratio of crude oil, heavy oil and injection water was 1:1:0.7), and the test solution was used as a blank control;

[0050] ii. mixing the corrosion-inhibiting and viscosity-reducing composition with the liquid to be tested, wherein the mass of the corrosion-inhibiting and viscosity-reducing composition is 0.3 wt % of the mass of the liquid to be tested, to obtain the liquid to be tested treated with the corrosion-inhibiting and viscosity-reducing composition;

[0051] ⅲ The viscosity of the blank control group test liquid and the test liquid of the experimental group treated with the corrosion inhibition and viscosity reduction composition was measured at room temperature (i.e., 25°C) using an RND-1 petroleum product kinematic viscosity meter produced by Jilin Ruigu Scientific Instrument Co., Ltd. and recorded. The viscosity reduction rate was further calculated. The results are shown in Table 1.

[0052] Table 1. Evaluation of viscosity reduction effect of corrosion inhibition and viscosity reduction composition

[0053] Serial number Viscosity (mP.s) Viscosity reduction rate (%) Blank control 28420 / Example 1 11640 59.04 Example 2 10230 64.00 Example 3 10540 62.91

[0054] As shown in Table 1, the corrosion-inhibiting and viscosity-reducing compositions prepared in Examples 1 to 3 exhibited viscosity reduction rates of 59% to 64% at room temperature for a test fluid obtained by mixing crude oil, heavy oil, and injection water in a mass ratio of 1:1:0.7. This indicates that the corrosion-inhibiting and viscosity-reducing compositions prepared in Examples 1 to 3 exhibited significant viscosity-reducing effects on the test fluids. Among these, the corrosion-inhibiting and viscosity-reducing composition prepared in Example 2 exhibited the best viscosity-reducing performance, achieving a viscosity-reduction rate of 64% for the test fluid at room temperature.

[0055] 2. Evaluation of the viscosity reduction performance of the corrosion inhibition and viscosity reduction composition at 20°C, 50°C, and 80°C

[0056] The viscosity of the heavy oil used in this experiment is as follows:

[0057] Heavy oil: viscosity at 50°C is 16800 mPa.s.

[0058] The viscosity reducing performance of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 on heavy oil at 80° C., 50° C., and 20° C. was measured. The specific steps are as follows:

[0059] a. Use heavy oil with a viscosity of 16800 mPa.s at 50°C as the blank control;

[0060] b. The corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 were mixed with heavy oil, the mass of the corrosion inhibition and viscosity reducing composition being 0.3wt% of the mass of the heavy oil to obtain heavy oil treated with different corrosion inhibition and viscosity reducing compositions;

[0061] c. The viscosity values ​​of the blank control group (i.e., heavy oil) and the experimental group (i.e., heavy oil treated with the corrosion inhibition and viscosity reduction compositions prepared in Examples 1 to 3) at 80°C, 50°C, and 20°C were measured using an RND-1 petroleum product kinematic viscosity meter produced by Jilin Ruigu Scientific Instrument Co., Ltd. The specific results are shown in Table 2.

[0062] Table 2. Viscosity reduction performance of the corrosion inhibition and viscosity reduction composition on heavy oil at 80°C, 50°C and 20°C

[0063]

[0064] Comparing the blank control data in Table 2 with the data of Examples 1 to 3, it can be seen that the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 have a certain degree of viscosity reducing effect on heavy oil in the temperature range of 20°C to 80°C, among which the viscosity reducing effect at 20°C is the best: the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 have a viscosity reduction rate of 60.09% to 62.12% for heavy oil at 20°C; the corrosion inhibition and viscosity reducing composition prepared in Example 2 has a viscosity reduction rate of 62.12% for heavy oil at 20°C.

[0065] 3. Evaluation of corrosion inhibition performance of corrosion inhibition and viscosity reduction composition

[0066] The viscosity of crude oil and heavy oil and the salinity of injected water used in this experiment are as follows:

[0067] Crude oil: viscosity at 30°C is 57 mPa.s;

[0068] Heavy oil: viscosity at 50°C is 16800 mPa.s;

[0069] Injection water: oilfield produced water with a salinity of 210,000 mg / L.

[0070] The corrosion inhibition performance of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 was evaluated according to "3. Normal Pressure Static Corrosion Rate and Inhibition Rate Determination Method" in the standard SY / T 5273--2000 "Performance Evaluation Method of Corrosion Inhibitors for Oilfield Produced Water". The specific steps are as follows:

[0071] A. Preparation of corrosive medium: Crude oil, heavy oil, and injection water were mixed uniformly at a mass ratio of 1:1:0.7 to obtain the corrosive medium, which served as the blank control group.

[0072] B. Preparing a corrosive medium containing the corrosion-inhibiting and viscosity-reducing composition: The corrosion-inhibiting and viscosity-reducing compositions prepared in Examples 1 to 3 were mixed with the corrosive medium prepared in Step A, respectively, with the mass of the corrosion-inhibiting and viscosity-reducing composition being 0.3 wt % of the mass of the corrosive medium, to obtain three groups of corrosive media containing different corrosion-inhibiting and viscosity-reducing compositions, which served as experimental groups;

[0073] C. Coupon treatment: Use an N80 steel sheet. First, wipe the N80 steel sheet clean with filter paper. Then place it in a container filled with petroleum ether with a boiling range of 60 to 90°C. After removing the grease from the surface of the N80 steel sheet with absorbent cotton, soak it in anhydrous ethanol for 5 minutes for further degreasing and dehydration. Remove the N80 steel sheet and place it on the filter paper. Blow it dry with cold air, then wrap the test piece with filter paper and store it in a desiccator. After 1 hour, measure the dimensions and weigh the initial mass to the nearest 0.1mg.

[0074] D. Three N80 steel sheets were immersed in a blank control group containing no corrosion-inhibiting and viscosity-reducing composition and in each experimental group containing a different corrosion-inhibiting and viscosity-reducing composition, and then taken out after standing at room temperature (25° C.) for 168 hours to obtain corroded N80 steel sheets;

[0075] E. Cleaning of the corroded N80 steel sheet: Wipe the corroded N80 steel sheet dry with filter paper, place it in a container containing petroleum ether with a boiling range of 60 to 90° C., remove the oil stains on the surface of the N80 steel sheet with absorbent cotton, and then soak it in anhydrous ethanol for 5 minutes for further degreasing and dehydration; then soak the corroded N80 steel sheet in an acid cleaning solution (prepared by mixing 100 mL of concentrated hydrochloric acid and 5 g of hexamethylenetetramine and diluting it to 1000 mL with water) for 5 minutes, and at the same time, use tweezers to gently wipe the corrosion products on the surface of the N80 steel sheet, then remove the N80 steel sheet, rinse the surface residual acid with tap water, and immediately immerse it in a sodium hydroxide aqueous solution with a mass concentration of 60 g / L, soak for 30 seconds, rinse with tap water, and then soak it in anhydrous ethanol for 5 minutes, washing and dehydrating it twice. Finally, place the corroded N80 steel sheet after the above cleaning treatment on the filter paper, blow it dry with cold air, then wrap the N80 steel sheet with filter paper and store it in a desiccator. After standing for 1 hour, weigh the mass of the corroded N80 steel sheet with an accuracy of 0.1 mg.

[0076] F. The uniform corrosion rate of each N80 steel sheet is calculated by formula (1), and then the arithmetic mean of the uniform corrosion rates of the three N80 steel sheets in the same group is taken as the measurement result of the group.

[0077]

[0078] Among them, r corr is the uniform corrosion rate, in mm / a;

[0079] m is the initial mass of the N80 steel sheet, in g;

[0080] m t is the mass of the corroded N80 steel sheet, in g;

[0081] S1 is the area of ​​N80 steel sheet, in cm 2 ;

[0082] t is the experimental time, in h;

[0083] ρ is the density of N80 steel sheet material, in g / cm 3 .

[0084] G. The corrosion inhibition rate of each N80 steel sheet is further calculated by formula (2), and then the arithmetic mean of the corrosion inhibition rates corresponding to the three N80 steel sheets in the same group is taken as the measurement result of the group.

[0085]

[0086] Wherein, η is the corrosion inhibition rate, in %;

[0087] Δm0 is the mass loss of N80 steel sheet in the blank control group, in g;

[0088] Δm1 is the mass loss of N80 steel sheet in the experimental group, in g.

[0089] The results are shown in Table 3.

[0090] Table 3. Evaluation of corrosion inhibition performance of corrosion inhibition and viscosity reduction compositions

[0091] Serial number Uniform corrosion rate (mm / a) Corrosion inhibition rate (%) Blank control 0.173 / Example 1 0.042 75.72 Example 2 0.034 80.35 Example 3 0.046 73.41

[0092] The data in Table 3 show that the corrosion-inhibiting and viscosity-reducing compositions prepared in Examples 1 to 3 exhibit good corrosion inhibition effects: the corrosion-inhibiting and viscosity-reducing composition prepared in Example 1 exhibits a corrosion inhibition rate of 75.72% for the N80 steel sheet, while the corrosion-inhibiting and viscosity-reducing composition prepared in Example 2 exhibits a corrosion inhibition rate of 80.35% for the N80 steel sheet, showing the best corrosion inhibition performance. The corrosion-inhibiting and viscosity-reducing composition prepared in Example 3 exhibits a corrosion inhibition rate of 73.41% for the N80 steel sheet. This demonstrates that the corrosion-inhibiting and viscosity-reducing compositions exhibit significant corrosion inhibition effects.

[0093] The data in Table 1 and Table 2 reflecting the viscosity reduction performance of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 obtained from the comprehensive experiments 1 to 3 and the experimental data in Table 3 reflecting the corrosion inhibition performance of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 can be seen: at room temperature, the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 have viscosity reduction rates of 59.04%, 64% and 62.91% for the test liquids obtained by mixing crude oil, heavy oil and injection water in a mass ratio of 1:1:0.7; at 20°C, the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 have a viscosity reduction rate of 59.04%, 64% and 62.91% for the test liquids obtained by mixing crude oil, heavy oil and injection water in a mass ratio of 1:1:0.7; at 20°C, the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 have a viscosity reduction rate of 64% and 62.91% for the heavy oil (viscosity of 25660 mPa at 20°C). .s) were 60.09%, 62.12% and 61.11% respectively; at 50°C, the viscosity reduction rates of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 for heavy oil (viscosity of 16800 mPa.s at 50°C) were 46.9%, 49.82% and 48.10% respectively; at 80°C, the viscosity reduction rates of the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 for heavy oil (viscosity of 8340 mPa.s at 80°C) were 29.74%, 34.89% and 32.13% respectively, indicating that the corrosion inhibition and viscosity reducing compositions prepared in Examples 1 to 3 have viscosity reducing properties. At room temperature, the corrosion inhibition and viscosity reduction compositions prepared in Examples 1 to 3 exhibited corrosion inhibition rates of 75.72%, 80.35%, and 73.41%, respectively, on N80 steel sheets in a corrosive medium composed of a mixture of crude oil, heavy oil, and injection water at a mass ratio of 1:1:0.7. This indicates that the corrosion inhibition and viscosity reduction compositions prepared in Examples 1 to 3 exhibit corrosion inhibition properties. These two findings further demonstrate the synergistic effect between the imidazoline compounds, paraben compounds, polyacrylic acid, and dimethyl carbonate in terms of viscosity reduction and corrosion inhibition. The corrosion inhibition and viscosity reduction compositions prepared in Examples 1 to 3 not only exhibit corrosion inhibition properties but also a viscosity reduction effect, making them corrosion inhibitors with both viscosity reduction and viscosity reduction capabilities.

[0094] Although the present invention has been described with reference to specific embodiments, those skilled in the art will appreciate that various modifications may be made without departing from the true spirit and scope of the invention. Furthermore, the subject matter, spirit, and scope of the invention may be modified in various ways to adapt to specific circumstances, materials, combinations of materials, and methods. All such modifications are intended to be within the scope of the claims.

Claims

1. A corrosion inhibition and viscosity reduction composition comprising an imidazoline compound, a parahydroxybenzoate compound, dimethyl carbonate, polyacrylic acid, maleic acid and a solvent.

2. The corrosion inhibition and viscosity reduction composition according to claim 1, characterized in that Based on the quality of the corrosion inhibition and viscosity reduction composition, the corrosion inhibition and viscosity reduction composition includes: 10 to 15 parts by mass of an imidazoline compound; 2 to 6 parts by mass of paraben compounds; 1 to 8 parts by mass of dimethyl carbonate; 1 to 5 parts by mass of polyacrylic acid; 2 to 10 parts by mass of maleic acid; 15 to 30 parts by mass of solvent.

3. The corrosion inhibition and viscosity reduction composition according to claim 1, characterized in that The corrosion inhibition and viscosity reduction composition comprises: 10 to 15 parts by mass of an imidazoline compound; 2 to 6 parts by mass of paraben compounds; 1 to 3 parts by mass of dimethyl carbonate; 1 to 5 parts by mass of polyacrylic acid; 4 to 8 parts by mass of maleic acid; 20 to 30 parts by mass of solvent.

4. The corrosion-inhibiting and viscosity-reducing composition according to any one of claims 1 to 3, characterized in that: The imidazoline compound is selected from at least one of aminoethyl heptadecenyl imidazoline and lauryl imidazoline.

5. The corrosion inhibition and viscosity reduction composition according to claim 4, characterized in that: The imidazoline compound is lauryl imidazoline.

6. The corrosion-inhibiting and viscosity-reducing composition according to any one of claims 1 to 3, characterized in that: The parahydroxybenzoate compound is selected from at least two of methyl parahydroxybenzoate, ethyl parahydroxybenzoate and propyl parahydroxybenzoate.

7. The corrosion inhibition and viscosity reduction composition according to claim 6, characterized in that: The parahydroxybenzoic acid ester compound is a mixture of methyl parahydroxybenzoate and ethyl parahydroxybenzoate.

8. The corrosion inhibition and viscosity reduction composition according to claim 7, characterized in that: The molar ratio of methyl parahydroxybenzoate to ethyl parahydroxybenzoate is 1:0.

8.

9. The corrosion-inhibiting and viscosity-reducing composition according to any one of claims 1 to 3, characterized in that: The weight average molecular weight of the polyacrylic acid is 3,000 to 5,000.

10. The corrosion inhibition and viscosity reduction composition according to claim 9, characterized in that: The weight average molecular weight of the polyacrylic acid is 5000.

11. The corrosion-inhibiting and viscosity-reducing composition according to any one of claims 1 to 3, characterized in that: The solvent is a lower alcohol.

12. A method for preparing the corrosion-inhibiting and viscosity-reducing composition according to any one of claims 1 to 11, comprising the following steps: The imidazoline compound, the p-hydroxybenzoate compound, dimethyl carbonate, polyacrylic acid, maleic acid and a solvent are mixed, heated and cooled to obtain the corrosion inhibition and viscosity reduction composition.

13. The method according to claim 12, characterized in that The heating temperature is 80°C to 90°C.

14. Use of the corrosion-inhibiting and viscosity-reducing composition according to any one of claims 1 to 11 or the corrosion-inhibiting and viscosity-reducing composition prepared by the method according to claim 12 or 13 in the field of oilfield corrosion protection technology.

15. The use according to claim 14, characterized in that The application is in the field of oil field anti-corrosion technology as a corrosion inhibitor with viscosity reducing effect.

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