Boron-containing paraffin inhibitor and preparation method thereof

Abstract

The invention relates to the technical field of additives in oil wells, in particular to a boron-containing paraffin inhibitor and a preparation method thereof, the boron-containing paraffin inhibitor comprises the following raw materials in percentage by mass: 5-25% of hydroxyethyl ethylenediamine boric acid condensate, 3-15% of fatty alcohol-polyoxyethylene ether, 5-15% of polyol ester, 0.5-5% of solubilizer and the balance of water. In the latter, after the hydroxyethyl ethylenediamine boric acid condensate is prepared, water and polyol ester with the required amount are uniformly mixed to obtain a mixed solution, after the mixed solution is heated, fatty alcohol-polyoxyethylene ether, the solubilizer and the hydroxyethyl ethylenediamine boric acid condensate with the required amount are sequentially added, stirring is performed, and the boron-containing paraffin inhibitor is obtained. The raw materials are easy to obtain and have good compatibility, the preparation process is easy to operate, the obtained boron-containing paraffin inhibitor can be attached to the surfaces of a metal oil pipe and wax crystal particles to form a film, wax crystals are prevented from gathering and growing up, the application temperature is wide, and the paraffin inhibition effect is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of additives in oil wells, and is a boron-containing wax inhibitor and a preparation method thereof. Background Art

[0002] Wax usually exists in a dissolved state under oil layer conditions. However, during the mining process, waxy crude oil rises along the oil pipe. As the pressure continues to decrease and the light components continue to overflow, the crude oil's ability to dissolve wax decreases, and some wax crystals will precipitate from the oil. Since the pipeline surface has a certain degree of roughness, it can serve as the wax crystallization core, causing the wax precipitated from the crude oil to gradually gather and grow, accelerating the wax crystallization process in the crude oil pipeline. Wax crystallization in the pipeline will increase the flow resistance of crude oil, directly affecting production and energy consumption, and in severe cases will cause production suspension. Therefore, wax prevention and wax removal have always been an important and regular task in the daily management of oil wells. Reasonable and timely prevention of wax crystallization and delaying the wax removal cycle are important guarantees for the normal production of oil wells.

[0003] Wax inhibitor is a chemical substance used to prevent wax deposition. Its working principle is to prevent wax deposition or reduce the speed of wax deposition by combining with wax or changing the properties of wax. In recent years, with the widespread application of surfactants, solvent-based wax inhibitors have made great progress and are mainly divided into three types: oil-based wax inhibitors, water-based wax inhibitors and emulsion wax inhibitors. In wax inhibitors, surfactants are mainly used to prevent wax crystals from growing. This material will adhere to the surface of wax crystal particles to form a thin film to prevent wax crystals from aggregating and growing. In this way, wax crystals in a particle state can be dispersed in the oil and taken out of the oil well. At the same time, surfactants will also adhere to the surface of the oil pipe to form a thin film, which will hinder the deposition of wax crystals. Although certain effects have been achieved in practical applications, the existing wax inhibitor process has a poor wax inhibitor effect due to the dilution of the added wax inhibitor by oil.

[0004] The Chinese patent document with publication number CN111410947A discloses a composite wax inhibitor and a preparation method thereof. The raw materials of the composite wax inhibitor include fatty alcohol polyoxyethylene ether, polyol ester, solubilizer, isobutylene sulfide, and water. The required amount of water and polyol ester are evenly mixed to obtain a mixed solution. After the mixed solution is heated to 40°C to 60°C, fatty alcohol polyoxyethylene ether, solubilizer, and isobutylene sulfide are added in sequence and stirred until completely dissolved to obtain a boron-containing wax inhibitor. The composite wax inhibitor in this invention can effectively inhibit the crystallization of wax in crude oil on the pipe wall or oil rod, and can also adhere to the surface of wax crystal particles to prevent wax crystals from aggregating and growing, so that the wax crystal particles are dispersed in the crude oil in time and taken out of the oil well. However, the wax inhibitor in this invention is unstable in film formation on the pipe wall of the oil pipe, resulting in a low wax prevention rate and poor wax prevention effect.

[0005] Therefore, it is particularly important to study and invent a wax-proof agent with stable film formation and higher performance to solve the above problems. Summary of the invention

[0006] The present invention provides a boron-containing wax inhibitor and a preparation method thereof, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of unstable film formation and poor wax inhibitor effect of the existing wax inhibitor in crude oil production, which affect the normal production of crude oil.

[0007] One of the technical solutions of the present invention is achieved through the following measures: a boron-containing wax inhibitor, the raw materials of which include, by mass percentage, 5% to 25% of hydroxyethylethylenediamine boric acid condensate, 3% to 15% of fatty alcohol polyoxyethylene ether, 5% to 15% of polyol ester, 0.5% to 5% of solubilizer, and the rest is water, and is prepared according to the following method: first, the required amount of water and polyol ester are mixed evenly to obtain a mixed solution; then, after heating the mixed solution, the required amount of di-fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate are added in sequence, and stirred until completely dissolved to obtain the boron-containing wax inhibitor.

[0008] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned boron-containing wax inhibitor comprises, by weight percentage, the following raw materials: 10% to 15% of hydroxyethylethylenediamine boric acid condensate, 5% to 10% of fatty alcohol polyoxyethylene ether, 5% to 10% of polyol ester, 1% to 3% of solubilizer, and the rest is water.

[0009] The polyol esters are one or more types of sorbitol esters.

[0010] The solubilizer is one or more of ethylene glycol monobutyl ether and triethylene glycol butyl ether.

[0011] The preparation process of the above-mentioned hydroxyethylethylenediamine boric acid condensate comprises: S1, mixing a required amount of boric acid and hydroxyethylethylenediamine to obtain a mixed solution; S2, adding a required amount of xylene to the mixed solution, raising the temperature, and reacting to obtain an intermediate product; S3, heating the intermediate product to react, and then cooling it to obtain a hydroxyethylethylenediamine boric acid condensate.

[0012] In the above step S1, the molar ratio of boric acid to hydroxyethylethylenediamine is 1:1.

[0013] In the above step S2, the amount of xylene added is 3% to 10% of the total weight of boric acid and hydroxyethylethylenediamine, the reaction temperature is 140° C. to 150° C., and the reaction time is 4 h to 6 h.

[0014] In the above step S3, the reaction temperature is 170° C. to 180° C., the reaction time is 5 h to 12 h, and after the acid value of the product reaches 0 to 10.0 mgKOH / g, the temperature is lowered to room temperature.

[0015] In the third step, the heating temperature is 40°C to 60°C.

[0016] The second technical solution of the present invention is achieved by the following measures: A method for preparing a boron-containing wax inhibitor is carried out according to the following method: The first step is to prepare a hydroxyethylethylenediamine boric acid condensate; The second step is to uniformly mix the required amount of water and polyol ester to obtain a mixed solution; The third step is to heat the mixed solution, and then add required amounts of fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate in sequence, and stir to obtain a boron-containing wax inhibitor.

[0017] The present invention mixes boric acid and hydroxyethylethylenediamine in proportion, adds a required amount of xylene, reacts to obtain a hydroxyethylethylenediamine boric acid condensate, and then mixes and stirs a required amount of water and polyol ester, fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate to obtain a boron-containing wax inhibitor. The boron-containing wax inhibitor in the present invention can effectively inhibit the crystallization of wax in crude oil on the pipe wall or the oil pipe, and can also adhere to the surface of wax crystal particles to prevent wax crystals from aggregating and growing, so that the wax crystal particles are dispersed in the crude oil in time and taken out of the oil well. The present invention has easy-to-obtain raw materials and good compatibility between the raw materials, and has the characteristics of wide applicable temperature and significant wax-proofing effect. DETAILED DESCRIPTION

[0018] The present invention is not limited by the following embodiments, and the specific implementation method can be determined according to the technical scheme of the present invention and the actual situation. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all known and commonly used chemical reagents and chemicals in the prior art; unless otherwise specified, the percentages in the present invention are all mass percentages; the normal temperature and room temperature in the present invention generally refer to the temperature of 15°C to 25°C, and are generally defined as 25°C.

[0019] The present invention will be further described below in conjunction with embodiments: Example 1: The boron-containing wax inhibitor, whose raw materials include, by mass percentage, 5% to 25% of hydroxyethylethylenediamine boric acid condensate, 3% to 15% of fatty alcohol polyoxyethylene ether, 5% to 15% of polyol ester, 0.5% to 5% of solubilizer, and the rest is water, is prepared according to the following method: first, uniformly mix the required amounts of water and polyol ester to obtain a mixed solution; then, after heating the mixed solution, sequentially add the required amounts of di-fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate, and stir until completely dissolved to obtain the boron-containing wax inhibitor.

[0020] The boron element contained in the molecular structure of the hydroxyethylethylenediamine boric acid condensate used in the present invention is easily adsorbed on the surface of the metal pipe of the oil well, forming a protective layer on the metal surface to fill the microscopic pits and irregular parts on the metal surface. At the same time, the hydroxyl groups in the molecular structure combine with water molecules in the oil field produced fluid to form a hydrophilic film on the surface of the metal pipe, preventing the oil phase from contacting the metal surface, isolating the precipitated wax crystals from being deposited and waxed on the wall of the oil well pipe, thereby achieving an anti-wax effect. At the same time, the film formed by the hydroxyethylethylenediamine boric acid condensate and the pipe wall is insensitive to temperature changes, and even in the case of a large temperature difference change, a high anti-wax rate is still maintained, ensuring efficient and normal production.

[0021] The general formula of fatty alcohol polyoxyethylene ether is RO-(CH2CH2O)nH, where R is a C7 to C 18 The alkyl group of R and n is an integer from 3 to 20, and the types of fatty alcohol polyoxyethylene ethers vary due to the differences in R and n. The fatty alcohol polyoxyethylene ethers used in the present invention are one or more of AEO-3, AEO-9, MOA-5, MOA-7, Peregal O-10 and Peregal O-20. On the one hand, the fatty alcohol polyoxyethylene ethers can form a thin film with the surface of the wax crystal particles to isolate the contact, aggregation and growth of the wax crystals; on the other hand, the fatty alcohol polyoxyethylene ethers form an adsorption film on the surface of the oil pipe to isolate the precipitated wax crystals from being deposited on the wall of the oil well pipe, thereby improving the anti-wax effect of the anti-wax agent.

[0022] The polyol ester used in the present invention is one or more of Span-20, Span-65, and Span-80 among sorbitol esters, the full name of Span-20 is sorbitan laurate monoester, the full name of Span-65 is sorbitan tristearate, and the full name of Span-80 is sorbitan fatty acid ester. Sorbitol ester can penetrate from the gap between the wax block and the well wall, reduce the adhesion between the wax block and the well wall, and thus play a role in wax removal. On the other hand, since the lipophilic group in the polyol ester structure is attached to the well wall surface, the hydrophilic group will combine with the water molecules in the crude oil, and then a hydrophilic film can be formed between the well walls, further improving the anti-wax effect.

[0023] Example 2: As an optimization of the above example, the boron-containing wax inhibitor raw materials include, by mass percentage, 10% to 15% of hydroxyethylethylenediamine boric acid condensate, 5% to 10% of fatty alcohol polyoxyethylene ether, 5% to 10% of polyol ester, 1% to 3% of solubilizer, and the rest is water.

[0024] Embodiment 3: As an optimization of the above embodiment, the polyol ester is one or more of sorbitol esters.

[0025] Embodiment 4: As an optimization of the above embodiment, the solubilizer is one or more of ethylene glycol monobutyl ether and triethylene glycol butyl ether.

[0026] Example 5: As an optimization of the above example, the preparation process of hydroxyethylethylenediamine boric acid condensate includes: S1, mixing a required amount of boric acid and hydroxyethylethylenediamine to obtain a mixed solution; S2, adding a required amount of xylene to the mixed solution, raising the temperature, and reacting to obtain an intermediate product; S3, heating the intermediate product to react, and then cooling it to obtain a hydroxyethylethylenediamine boric acid condensate.

[0027] Example 6: As an optimization of the above example, in step S1, the molar ratio of boric acid to hydroxyethylethylenediamine is 1:1.

[0028] Example 7: As an optimization of the above example, in step S2, the amount of xylene added is 3% to 10% of the total weight of boric acid and hydroxyethylethylenediamine, the reaction temperature is 140° C. to 150° C., and the reaction time is 4 h to 6 h.

[0029] Example 8: As an optimization of the above example, in step S3, the reaction temperature is 170°C to 180°C, the reaction time is 5h to 12h, and after the acid value of the product is 0 to 10.0 mg KOH / g, the temperature is lowered to room temperature.

[0030] Example 9: As an optimization of the above example, in the third step, the heating temperature is 40°C to 60°C.

[0031] Example 10: The preparation method of the boron-containing wax inhibitor is carried out according to the following method: The first step is to prepare a hydroxyethylethylenediamine boric acid condensate; The second step is to uniformly mix the required amount of water and polyol ester to obtain a mixed solution; The third step is to heat the mixed solution, and then add required amounts of fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate in sequence, and stir to obtain a boron-containing wax inhibitor.

[0032] The reagents Span-20, Span-65, and Span-80 used in the following embodiments of the present invention can be produced by Tianjin Baodi District Gangfei Auxiliary Agent Co., Ltd., ethylene glycol monobutyl ether and triethylene glycol butyl ether can be produced by Shanghai Demao Chemical Co., Ltd., AEO-3, AEO-9, MOA-5 and MOA-7 can be produced by Tianjin Baodi District Gangfei Auxiliary Agent Co., Ltd., and Pingpingjia O-10 and Pingpingjia O-20 can be produced by Zibo Haijie Chemical Co., Ltd.

[0033] Example 11: The boron-containing wax inhibitor is prepared according to the following method: The first step is to prepare hydroxyethylethylenediamine boric acid condensate: S1, mixing 61.80 g of boric acid and 312.60 g of hydroxyethylethylenediamine to obtain a mixed solution; S2, add 11.2 g of xylene to the mixed solution, slowly heat it to 140° C. under stirring, and reflux for dehydration reaction for 4 h to obtain an intermediate product; S3, heating the intermediate product to 170°C again, reflux reaction for 5 hours, and when the acid value of the product is 8.6 mg KOH / g, cooling to room temperature to obtain hydroxyethylethylenediamine boric acid condensate; In the second step, 71.5 g of water and 15 g of Span-20 were mixed to obtain a mixed solution; The third step is to heat the mixed solution to 40°C, then add 10g AEO-3, 0.5g ethylene glycol monobutyl ether, and 3g hydroxyethylethylenediamine boric acid condensate in sequence, and stir at 40°C until the materials are completely dissolved to obtain a boron-containing wax inhibitor.

[0034] Example 12: The boron-containing wax inhibitor is prepared according to the following method: The first step is to prepare hydroxyethylethylenediamine boric acid condensate: S1, mixing 61.80 g of boric acid and 312.60 g of hydroxyethylethylenediamine to obtain a mixed solution; S2, add 37.44 g of xylene to the mixed solution, slowly heat it to 150° C. under stirring, and reflux for dehydration reaction for 6 h to obtain an intermediate product; S3, heating the intermediate product to 180°C again, reflux reaction for 12h, and when the acid value of the product is 4.5mg KOH / g, cooling to room temperature to obtain hydroxyethylethylenediamine boric acid condensate; In the second step, 45 g of water and 5 g of Span-65 were mixed evenly to obtain a mixed solution; The third step is to heat the mixed solution to 60°C, then add 30g MOA-5, 5g triethylene glycol butyl ether, and 15g hydroxyethylethylenediamine boric acid condensate in sequence, and stir at 60°C until the materials are completely dissolved to obtain a boron-containing wax inhibitor.

[0035] Example 13: The boron-containing wax inhibitor is prepared according to the following method: The first step is to prepare hydroxyethylethylenediamine boric acid condensate: S1, mixing 61.80 g of boric acid and 312.60 g of hydroxyethylethylenediamine to obtain a mixed solution; S2, add 29.95g of xylene to the mixed solution, slowly heat it to 145°C while stirring, and reflux and dehydrate it for 5h to obtain an intermediate product; S3, heating the intermediate product to 175°C again, reflux reaction for 10 hours, and when the acid value of the product is 6.1 mg KOH / g, cooling to room temperature to obtain hydroxyethylethylenediamine boric acid condensate; In the second step, 64 g of water and 10 g of Span-80 were mixed evenly to obtain a mixed solution; The third step is to heat the mixed solution to 50°C, then add 25g AEO-9, 31g ethylene glycol monobutyl ether, and 10g hydroxyethylethylenediamine boric acid condensate in sequence, and stir at 50°C until the materials are completely dissolved to obtain a boron-containing wax inhibitor.

[0036] Example 14: The boron-containing wax inhibitor is prepared according to the following method: The first step is to prepare hydroxyethylethylenediamine boric acid condensate: S1, mixing 61.80 g of boric acid and 312.60 g of hydroxyethylethylenediamine to obtain a mixed solution; S2, add 29.95g of xylene to the mixed solution, slowly raise the temperature to 142°C while stirring, and reflux for dehydration reaction for 8h to obtain an intermediate product; S3, heating the intermediate product to 173°C again, reflux reaction for 9 hours, and when the acid value of the product is 5.5 mg KOH / g, cooling to room temperature to obtain hydroxyethylethylenediamine boric acid condensate; In the second step, 56 g of water and 10 g of Span-80 were mixed to obtain a mixed solution; The third step is to heat the mixed solution to 40°C, then add 25g MOA-7, 4g ethylene glycol monobutyl ether, and 5g hydroxyethylethylenediamine boric acid condensate in sequence, and stir at 40°C until the materials are completely dissolved to obtain a boron-containing wax inhibitor.

[0037] Example 15: The boron-containing wax inhibitor is prepared according to the following method: The first step is to prepare hydroxyethylethylenediamine boric acid condensate: S1, mixing 61.80 g of boric acid and 312.60 g of hydroxyethylethylenediamine to obtain a mixed solution; S2, add 29.95g of xylene to the mixed solution, slowly raise the temperature to 147°C while stirring, and reflux for dehydration reaction for 5h to obtain an intermediate product; S3, heating the intermediate product to 171°C again, reflux reaction for 6 hours, and when the acid value of the product is 5.9 mgKOH / g, cooling to room temperature to obtain hydroxyethylethylenediamine boric acid condensate; In the second step, 56.5 g of water and 13 g of Span-20 were mixed to obtain a mixed solution; The third step is to heat the mixed solution to 56°C, then add 20g of Perchlorate O-10, 2g of triethylene glycol butyl ether, and 8.5g of hydroxyethylethylenediamine boric acid condensate in sequence, and stir at 56°C until the materials are completely dissolved to obtain a boron-containing wax inhibitor.

[0038] Example 16: The boron-containing wax inhibitor is prepared according to the following method: The first step is to prepare hydroxyethylethylenediamine boric acid condensate: S1, mixing 61.80 g of boric acid and 312.60 g of hydroxyethylethylenediamine to obtain a mixed solution; S2, add 18.72g of xylene to the mixed solution, slowly raise the temperature to 147°C while stirring, and reflux for dehydration reaction for 7h to obtain an intermediate product; S3, heating the intermediate product to 170°C again, reflux reaction for 10 hours, and when the acid value of the product is 4.1 mgKOH / g, cooling to room temperature to obtain hydroxyethylethylenediamine boric acid condensate; In the second step, 45 g of water and 5 g of Span-65 were mixed evenly to obtain a mixed solution; The third step is to heat the mixed solution to 60°C, then add 30g of Perchlorate O-20, 5g of ethylene glycol monobutyl ether, and 15g of hydroxyethylethylenediamine boric acid condensate in sequence, and stir at 60°C until the materials are completely dissolved to obtain a boron-containing wax inhibitor.

[0039] Comparative Example 1: Using crude oil from an oil field in Xinjiang in the middle and late stages of development, an anti-wax experiment was carried out using the EVA (ethylene-vinyl acetate copolymer) wax crystal improved anti-wax agent produced by Shengli Chemical. The experimental test results refer to the technical indicators of SY / T6300-2009 "Technical Conditions for Cleaners and Anti-wax Agents for Oil Production". The specific test results are shown in Table 1.

[0040] Comparative Example 2: Using crude oil from an oil field in Xinjiang in the middle and late stages of development, an anti-wax experiment was carried out using the polyoxyethylene nonylphenol ether surfactant-type anti-wax agent produced by Shandong Binhua Group. The experimental test results refer to the technical indicators of SY / T6300-2009 "Technical Conditions for Cleaners and Anti-Wax Agents for Oil Production". The specific test results are shown in Table 1.

[0041] Using crude oil from a certain oil field in Xinjiang in the middle and late stages of development, the boron-containing wax inhibitor obtained in Examples 11 to 16 was subjected to wax inhibition experiments. The experimental test results refer to the technical indicators of SY / T6300-2009 "Technical Conditions for Oil Production Cleaners and Wax Inhibitors", and the specific test results are shown in Table 1. It can be seen from Table 1 that the wax inhibition rates of Comparative Example 1 and Comparative Example 2 are 63% and 65% respectively, and the tolerance temperatures of Comparative Example 1 and Comparative Example 2 are 84°C and 71°C respectively, and the viscosity reduction rates are not much different. The boron-containing wax inhibitor prepared in Examples 11 to 16 has a wax inhibition rate of more than 80% and a tolerance temperature of more than 95°C.

[0042] It can be seen that the boron-containing wax inhibitor in the present invention has a higher wax inhibition rate and a wider temperature tolerance than the existing wax inhibitors in Comparative Examples 1 and 2, indicating that the boron-containing wax inhibitor in the present invention has an excellent wax inhibition effect in waxy crude oil.

[0043] In summary, the boron-containing wax inhibitor of the present invention comprises hydroxyethylethylenediamine boric acid condensate which cooperates with fatty alcohol polyoxyethylene ether and polyol ester to form a stable film and has a good wax inhibitor effect. The film formed by the hydroxyethylethylenediamine boric acid condensate and the tube wall has strong temperature resistance.

[0044] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A boron-containing wax inhibitor, characterized in that The raw materials include, by mass percentage, 5% to 25% of hydroxyethylethylenediamine boric acid condensate, 3% to 15% of fatty alcohol polyoxyethylene ether, 5% to 15% of polyol ester, 0.5% to 5% of solubilizer, and the rest is water. The preparation method is as follows: first, the required amount of water and polyol ester are evenly mixed to obtain a mixed solution; then, after heating the mixed solution, the required amount of di-fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate are added in sequence, and stirred until completely dissolved to obtain a boron-containing wax inhibitor.

2. The boron-containing wax inhibitor according to claim 1, characterized in that The raw materials include, by mass percentage, 10% to 15% of hydroxyethylethylenediamine boric acid condensate, 5% to 10% of fatty alcohol polyoxyethylene ether, 5% to 10% of polyol ester, 1% to 3% of solubilizer, and the rest is water.

3. The boron-containing wax inhibitor according to claim 1 or 2, characterized in that The polyol ester is one or more kinds of sorbitol esters.

4. The boron-containing wax inhibitor according to claim 1, 2 or 3, characterized in that The solubilizing agent is one or more of ethylene glycol monobutyl ether and triethylene glycol butyl ether.

5. The boron-containing wax inhibitor according to claim 1, 2, 3 or 4, characterized in that The preparation process of hydroxyethylethylenediamine boric acid condensate comprises: S1, mixing a required amount of boric acid and hydroxyethylethylenediamine to obtain a mixed solution; S2, adding a required amount of xylene to the mixed solution, raising the temperature, and reacting to obtain an intermediate product; S3, heating the intermediate product to react, and then cooling it to obtain a hydroxyethylethylenediamine boric acid condensate.

6. The boron-containing wax inhibitor according to claim 5, characterized in that In step S1, the molar ratio of boric acid to hydroxyethylethylenediamine is 1:

1.

7. The boron-containing wax inhibitor according to claim 5 or 6, characterized in that In step S2, the amount of xylene added is 3% to 10% of the total weight of boric acid and hydroxyethylethylenediamine, the reaction temperature is 140° C. to 150° C., and the reaction time is 4 h to 6 h.

8. The boron-containing wax inhibitor according to claim 5, 6 or 7, characterized in that In step S3, the reaction temperature is 170° C. to 180° C., the reaction time is 5 h to 12 h, and after the acid value of the product reaches 0 to 10.0 mg KOH / g, the temperature is lowered to room temperature.

9. The boron-containing wax inhibitor according to claim 5, 6, 7 or 8, characterized in that In the third step, the heating temperature is 40°C to 60°C.

10. A method for preparing a boron-containing wax inhibitor according to any one of claims 1 to 9, characterized in that Proceed as follows: The first step is to prepare a hydroxyethylethylenediamine boric acid condensate; The second step is to uniformly mix the required amount of water and polyol ester to obtain a mixed solution; The third step is to heat the mixed solution, and then add required amounts of fatty alcohol polyoxyethylene ether, solubilizer, and hydroxyethylethylenediamine boric acid condensate in sequence, and stir to obtain a boron-containing wax inhibitor.

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