High-efficiency oil-based paraffin inhibitor and preparation method thereof

Abstract

The application discloses a preparation method of high-efficiency oil-based wax removal and prevention agent, which comprises uniformly mixing dimethylbenzene, straight-run gasoline, oil-soluble surfactant, rapid penetrating agent and nano-montmorillonite composite viscosity reducer to prepare the high-efficiency oil-based wax removal and prevention agent. The nano-montmorillonite composite viscosity reducer has long-chain oil-wet groups and sodium sulfate hydrophilic groups on the molecular structure, the structure of the oil-wet groups is similar to that of paraffin wax, the oil-wet groups can be eutectic with paraffin wax, the wax crystal cannot continue to grow, the hydrophilic groups stretch outside, hinder the combined paraffin wax with the three-dimensional network structure, and prevent the mutual adhesion of the wax crystals. The nano-montmorillonite can become the nucleation point of paraffin wax, change the structure and morphology of the wax crystal, increase the liquid oil flow space, and reduce the flow resistance of the crude oil, thereby playing the function of reducing the viscosity of the crude oil. The oil-soluble surfactant contains polyisobutylene structure, quaternary ammonium salt structure and aromatic hydrocarbon structure on the molecular structure, and the three structures are synergistic, so that the wax removal and prevention efficiency of the material is improved.

Description

Technical Field

[0001] This invention relates to the field of wax removal and anti-wax agent preparation technology, specifically to a high-efficiency oil-based wax removal and anti-wax agent and its preparation method. Background Technology

[0002] Oil-based wax removers and inhibitors are key chemical agents used in the petroleum extraction field to solve the problem of wax deposition in oil wells and gathering pipelines, and are widely used in the production process of medium- to high-wax crude oil. They work by dispersing and adsorbing onto the surface of wax crystals in crude oil, altering the morphology and growth habits of wax crystals, thereby dissolving existing wax deposits and inhibiting the adhesion of new wax, thus delaying wax formation. However, in practical applications, it has been found that the wax removal efficiency of many existing oil-based wax removers and inhibitors remains significantly limited in dynamic and complex downhole environments. This is mainly manifested in: a slow dissolution rate of existing dense, aged wax layers, failing to meet the rapid treatment needs of high-yield wells or wells with severe wax formation; and insufficient long-term stability in inhibiting wax crystal aggregation and deposition under low-temperature or high-shear conditions, resulting in a short wax prevention cycle and increased dosing frequency, affecting production continuity and economic benefits. Therefore, developing new oil-based wax removers and inhibitors that combine high-efficiency wax removal capabilities with long-term wax prevention performance has become an important technical direction for improving oil production efficiency and reducing maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to provide a high-efficiency oil-based wax remover and anti-wax agent to solve the problems of low wax removal efficiency and poor long-term stability of wax deposition inhibition in traditional oil-based wax removers and anti-wax agents.

[0004] The objective of this invention can be achieved through the following technical solutions: A method for preparing a high-efficiency oil-based wax remover and anti-wax agent specifically includes the following steps: Xylene, straight-run gasoline and oil-soluble surfactant are mixed evenly and stirred for 10-20 minutes at a speed of 800-1000 r / min and a temperature of 20-35℃. A fast penetrant is added and stirred for 5-20 minutes. A nano-montmorillonite composite viscosity reducer is added and stirred evenly to obtain a high-efficiency oil-based dewaxing agent. Furthermore, the weight ratio of xylene, straight-run gasoline, oil-soluble surfactant, fast-penetrating agent and nano-montmorillonite composite viscosity reducer mentioned in the step is 70-90:20-30:2-4:0.1-0.5:10-15, and the fast-penetrating agent is 2-octanol polyoxyethylene ether.

[0005] Furthermore, the nano-montmorillonite composite viscosity reducer is prepared by the following steps: Step A1: Glycidyl methacrylate, octadecylamine and toluene are mixed evenly and reacted for 3-4 hours under nitrogen atmosphere at a speed of 140-150 r / min and a temperature of 80-90℃ to obtain intermediate 1. Intermediate 1 is mixed evenly with methanol and stirred at a speed of 110-130 r / min and a temperature of 60-80℃, while sodium hydroxide and 1,4-butyryl lactone are added. The mixture is reacted for 2-3 hours to obtain intermediate 2. Step A2: Disperse montmorillonite in deionized water, sonicate it for 10-15 min at a temperature of 60-70℃ and a frequency of 30-40kHz, then stir and add hexadecyltrimethylammonium bromide at a speed of 150-180 r / min and a temperature of 60-70℃, and react for 6-8 h to obtain modified montmorillonite; Step A3: Disperse the modified montmorillonite in xylene, stir at 150-180 r / min and 85-95℃, add intermediate 2 and maleic anhydride, and react for 30-50 min. Add benzoyl peroxide, heat to 120-125℃, and react for 4-5 h. Add octadecylamine and react for 2-3 h to obtain the nano-montmorillonite composite viscosity reducer.

[0006] Furthermore, the molar ratio of glycidyl methacrylate and octadecylamine in step A1 is 1 mmol: 6-8 mmol, and the molar ratio of methanol, intermediate 1, sodium hydroxide and 1,4-butyric acid lactone is 250 mL: 0.2 g: 0.3 g: 0.95 g.

[0007] Furthermore, the ratio of montmorillonite, deionized water, and hexadecyltrimethylammonium bromide used in step A2 is 3g:60mL:1.9g.

[0008] Furthermore, the ratio of modified montmorillonite, xylene, intermediate 2, maleic anhydride and octadecylamine in step A3 is 2g:40mL:1.5mmol:1mmol:1.1mmol, and the amount of benzoyl peroxide is 0.5-0.8% of the mass of intermediate 2.

[0009] Furthermore, the oil-soluble surfactant is prepared by the following steps: Step B1: Phenol, boron trifluoride ether and n-hexane are mixed evenly. Under the conditions of 150-160 r / min, 50-55℃ and nitrogen gas, the mixture is stirred and highly active polyisobutylene is added. The temperature is raised to 65-70℃ and the reaction is carried out for 4-5 hours to obtain intermediate 3. Step B2: Mix intermediate 3 and toluene evenly, stir and add 3-(dimethylamino)propionyl chloride and triethylamine at a speed of 140-160 r / min and a temperature of 105-120℃, and react for 6-8 h. Then add 1-bromobutane and react for 8-10 h to obtain an oil-soluble surfactant.

[0010] Furthermore, the ratio of phenol, boron trifluoride ether, n-hexane, and highly active polyisobutylene in step B1 is 15g:2g:100mL:50g, and the average relative molecular weight of the highly active polyisobutylene is 1000.

[0011] Furthermore, the ratio of intermediate 3, 3-(dimethylamino)propionyl chloride and 1-bromobutane in step B2 is 1 mmol:1.1 mmol:1.5 mmol.

[0012] This invention relates to the preparation technology of wax-removing agents, which serves as a supporting pretreatment technology for CO2 flooding reservoirs and is mainly applied in the field of oil extraction.

[0013] The beneficial effects of this invention are as follows: The 2-octyl alcohol polyoxyethylene ether penetrant added to the high-efficiency oil-based wax remover and inhibitor has extremely strong penetrating power. After its addition, it allows the high-efficiency oil-based wax remover and inhibitor to fully contact and react with wax crystals in crude oil and wax samples, dissolving and dispersing the deposited wax. Straight-run gasoline, as a diluent and low-cost solvent, adjusts the viscosity and volatility of the wax remover and inhibitor, assisting in the dissolution of paraffin wax. Based on the principle of "like dissolves like," wax crystals can dissolve in oil-soluble surfactants and nano-montmorillonite composite viscosity reducers, inhibiting the adhesion of new wax and delaying wax formation. Xylene has rapid dissolving ability and a large saturated wax dissolving capacity, achieving "like dissolves like" for wax.

[0014] A viscosity reducer made from nano-montmorillonite composite materials: Intermediate 1 is prepared by a ring-opening reaction between the epoxy group on glycidyl methacrylate and the amino group on octadecylamine to generate a new hydroxyl group. Then, the newly generated hydroxyl group on Intermediate 1 forms an oxygen anion under alkaline conditions, which nucleophilically attacks the six-membered ring of 1,4-butyrylolactone, forming a sulfonic acid group structure. Intermediate 2 is prepared by using the organic cations in the cationic surfactant hexadecyltrimethylammonium bromide to replace the inorganic hydrated cations between the layers of natural montmorillonite through an ion exchange reaction, changing the surface properties of montmorillonite from hydrophilic to hydrophobic. Modified montmorillonite is prepared by maintaining its intercalated state and large specific surface area in high-temperature xylene solvent. Intermediate 2 and maleic anhydride are transferred to the interlayer of modified montmorillonite through physical adsorption, and then polymerized in the interlayer under the action of an initiator, allowing the polymer to intercalate in situ into the organically modified nano-montmorillonite sheets, thus obtaining a viscosity reducer made from nano-montmorillonite composite materials.

[0015] Oil-soluble surfactant: Under the catalysis of boron trifluoride diethyl ether, the terminal carbon-carbon double bond of highly active polyisobutylene breaks, forming an active carbocation. Because the para-position of the phenolic hydroxyl group in phenol is electron-rich, the carbocation attacks the carbon atom in phenol and combines with phenol to obtain intermediate 3. The phenolic hydroxyl group on intermediate 3 reacts with the acyl chloride group on 3-(dimethylamino)propionyl chloride to introduce a tertiary amine structure. The addition of 1-bromobutane leads to an alkylation reaction, yielding the oil-soluble surfactant.

[0016] The polymer on the nano-montmorillonite composite viscosity reducer is a comb-like polymer with long-chain lipophilic groups and sodium sulfate hydrophilic groups in its molecular structure. The structure of the lipophilic groups is similar to that of paraffin wax, allowing it to co-crystallize with paraffin wax, preventing the wax crystals from growing further. The hydrophilic groups extend outwards, hindering the subsequent precipitation of paraffin wax and preventing it from binding with the wax to form a three-dimensional network structure. This prevents wax crystals from adhering to each other, changes the spatial network structure and morphology of wax crystals in the oil phase, reduces wax crystal adsorption, and further enhances the anti-waxing effect. The nano-montmorillonite on the nano-montmorillonite composite viscosity reducer is small in size and has a special nucleation effect, which can become a nucleation point for paraffin wax in crude oil. It co-precipitates with paraffin wax, forming smaller wax crystals, increasing the dispersion of wax crystals, making it less likely to crystallize into aggregated paraffin wax clusters, and lowering the pour point. At the same time, its layered structure can load and slowly release the effective components of the oil-based anti-waxing agent, extending the anti-waxing cycle. The oil-soluble surfactant contains polyisobutylene, quaternary ammonium salt, and aromatic hydrocarbon structures in its molecular structure. These three components work synergistically to improve the anti-waxing efficiency of the material. The long-chain structure of polyisobutylene ensures that the molecules are fully dispersed in crude oil and close to the wax crystals. The quaternary ammonium salt structure is electrostatically adsorbed on the surface of the wax crystals, effectively distorting their growth morphology. The aromatic hydrocarbon structure can enhance the compatibility of the molecules with the gum components in crude oil and improve the overall efficiency. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: A method for preparing a high-efficiency oil-based dewaxing agent, specifically including the following steps: Xylene, straight-run gasoline and oil-soluble surfactant were mixed evenly and stirred for 10 minutes at a speed of 800 r / min and a temperature of 20℃. A fast penetrant was added and stirred for 5 minutes. A nano-montmorillonite composite viscosity reducer was added and stirred evenly to obtain a high-efficiency oil-based dewaxing agent. The weight ratio of xylene, straight-run gasoline, oil-soluble surfactant, fast-penetrating agent and nano-montmorillonite composite viscosity reducer mentioned in the step is 90:30:2:0.1:10, and the fast-penetrating agent is 2-octanol polyoxyethylene ether.

[0019] The aforementioned nano-montmorillonite composite viscosity reducer is prepared by the following steps: Step A1: Glycidyl methacrylate, octadecylamine and toluene are mixed evenly and reacted for 3 hours at a speed of 140 r / min, a temperature of 80℃ and a nitrogen atmosphere to obtain intermediate 1. Intermediate 1 is mixed evenly with methanol and stirred at a speed of 110 r / min and a temperature of 60℃, and sodium hydroxide and 1,4-butyryl lactone are added and reacted for 2 hours to obtain intermediate 2. Step A2: Disperse montmorillonite in deionized water, sonicate it for 10 min at 60℃ and 30 kHz, then stir and add hexadecyltrimethylammonium bromide at 150 r / min and 60℃, and react for 6 h to obtain modified montmorillonite. Step A3: Disperse the modified montmorillonite in xylene, stir and add intermediate 2 and maleic anhydride at a speed of 150 r / min and a temperature of 85℃, and react for 30 min. Add benzoyl peroxide, heat to 120℃ and react for 4 h. Add octadecylamine and react for 2 h to obtain the nano-montmorillonite composite viscosity reducer.

[0020] The molar ratio of glycidyl methacrylate and octadecylamine in step A1 is 1 mmol: 6 mmol, and the ratio of methanol, intermediate 1, sodium hydroxide and 1,4-butyryl lactone is 250 mL: 0.2 g: 0.3 g: 0.95 g.

[0021] The ratio of montmorillonite, deionized water, and hexadecyltrimethylammonium bromide used in step A2 is 3g:60mL:1.9g.

[0022] The ratio of modified montmorillonite, xylene, intermediate 2, maleic anhydride and octadecylamine in step A3 is 2g:40mL:1.5mmol:1mmol:1.1mmol, the amount of maleic anhydride is 1mmol, and the amount of benzoyl peroxide is 0.5% of the mass of intermediate 2.

[0023] The oil-soluble surfactant is prepared by the following steps: Step B1: Phenol, boron trifluoride ether and n-hexane are mixed evenly. Under the conditions of 150 r / min, 50℃ and nitrogen gas, the mixture is stirred and highly active polyisobutylene is added. The temperature is raised to 65℃ and the reaction is carried out for 4 hours to obtain intermediate 3. Step B2: Mix intermediate 3 and toluene evenly, stir and add 3-(dimethylamino)propionyl chloride and triethylamine at a speed of 140 r / min and a temperature of 105℃, and react for 6 h. Then add 1-bromobutane and react for 8 h to obtain an oil-soluble surfactant.

[0024] The ratio of phenol, boron trifluoride ether, n-hexane and highly active polyisobutylene in step B1 is 15g:2g:100mL:50g, and the average relative molecular weight of the highly active polyisobutylene is 1000.

[0025] The ratio of intermediate 3, 3-(dimethylamino)propionyl chloride and 1-bromobutane in step B2 is 1 mmol: 1.1 mmol: 1.5 mmol.

[0026] Example 2: A method for preparing a high-efficiency oil-based dewaxing agent, specifically including the following steps: Xylene, straight-run gasoline and oil-soluble surfactant were mixed evenly and stirred for 15 minutes at a speed of 900 r / min and a temperature of 25℃. A fast penetrant was added and stirred for 10 minutes. A nano-montmorillonite composite viscosity reducer was added and stirred evenly to obtain a high-efficiency oil-based dewaxing agent. The weight ratio of xylene, straight-run gasoline, oil-soluble surfactant, fast-penetrating agent and nano-montmorillonite composite viscosity reducer mentioned in the step is 90:30:3:0.1:12, and the fast-penetrating agent is 2-octanol polyoxyethylene ether.

[0027] The aforementioned nano-montmorillonite composite viscosity reducer is prepared by the following steps: Step A1: Glycidyl methacrylate, octadecylamine and toluene are mixed evenly and reacted for 3 hours at a speed of 145 r / min, a temperature of 85℃ and a nitrogen atmosphere to obtain intermediate 1. Intermediate 1 is mixed evenly with methanol and stirred at a speed of 120 r / min and a temperature of 70℃, and sodium hydroxide and 1,4-butyryl lactone are added and reacted for 2 hours to obtain intermediate 2. Step A2: Disperse montmorillonite in deionized water, sonicate it for 12 min at 65℃ and 35kHz, then stir and add hexadecyltrimethylammonium bromide at 160r / min and 65℃, and react for 7 h to obtain modified montmorillonite. Step A3: Disperse the modified montmorillonite in xylene, stir and add intermediate 2 and maleic anhydride at a speed of 160 r / min and a temperature of 90℃, and react for 40 min. Add benzoyl peroxide, heat to 120℃ and react for 4 h. Add octadecylamine and react for 2 h to obtain the nano-montmorillonite composite viscosity reducer.

[0028] The molar ratio of glycidyl methacrylate and octadecylamine in step A1 is 1 mmol: 7 mmol, and the ratio of methanol, intermediate 1, sodium hydroxide and 1,4-butyryl lactone is 250 mL: 0.2 g: 0.3 g: 0.95 g.

[0029] The ratio of montmorillonite, deionized water, and hexadecyltrimethylammonium bromide used in step A2 is 3g:60mL:1.9g.

[0030] The ratio of modified montmorillonite, xylene, intermediate 2, maleic anhydride and octadecylamine in step A3 is 2g:40mL:1.5mmol:1mmol:1.1mmol, the amount of maleic anhydride is 2mmol, and the amount of benzoyl peroxide is 0.6% of the mass of intermediate 2.

[0031] The oil-soluble surfactant is prepared by the following steps: Step B1: Phenol, boron trifluoride ether and n-hexane are mixed evenly. Under the conditions of 150 r / min, 52℃ and nitrogen gas, the mixture is stirred and highly active polyisobutylene is added. The temperature is raised to 68℃ and the reaction is carried out for 4 hours to obtain intermediate 3. Step B2: Mix intermediate 3 and toluene evenly, stir and add 3-(dimethylamino)propionyl chloride and triethylamine at a speed of 150 r / min and a temperature of 110℃, and react for 7 h. Then add 1-bromobutane and react for 9 h to obtain an oil-soluble surfactant.

[0032] The ratio of phenol, boron trifluoride ether, n-hexane and highly active polyisobutylene in step B1 is 15g:2g:100mL:50g, and the average relative molecular weight of the highly active polyisobutylene is 1000.

[0033] The ratio of intermediate 3, 3-(dimethylamino)propionyl chloride and 1-bromobutane in step B2 is 1 mmol: 1.1 mmol: 1.5 mmol.

[0034] Example 3: A method for preparing a high-efficiency oil-based dewaxing agent, specifically including the following steps: Xylene, straight-run gasoline and oil-soluble surfactant were mixed evenly and stirred for 20 minutes at a speed of 1000 r / min and a temperature of 35℃. A fast penetrant was added and stirred for 20 minutes. A nano-montmorillonite composite viscosity reducer was added and stirred evenly to obtain a high-efficiency oil-based dewaxing agent. The weight ratio of xylene, straight-run gasoline, oil-soluble surfactant, fast-penetrating agent and nano-montmorillonite composite viscosity reducer mentioned in the step is 90:30:4:0.1:15, and the fast-penetrating agent is 2-octanol polyoxyethylene ether.

[0035] The aforementioned nano-montmorillonite composite viscosity reducer is prepared by the following steps: Step A1: Glycidyl methacrylate, octadecylamine and toluene are mixed evenly and reacted for 4 hours at a speed of 150 r / min, a temperature of 90℃ and a nitrogen atmosphere to obtain intermediate 1. Intermediate 1 is mixed evenly with methanol and stirred at a speed of 130 r / min and a temperature of 80℃, and sodium hydroxide and 1,4-butyryl lactone are added and reacted for 3 hours to obtain intermediate 2. Step A2: Disperse montmorillonite in deionized water, sonicate it for 15 min at 70℃ and 40 kHz, then stir and add hexadecyltrimethylammonium bromide at 180 r / min and 70℃, and react for 8 h to obtain modified montmorillonite. Step A3: Disperse the modified montmorillonite in xylene, stir and add intermediate 2 and maleic anhydride at a speed of 180 r / min and a temperature of 95℃, and react for 50 min. Add benzoyl peroxide, heat to 125℃ and react for 5 h. Add octadecylamine and react for 3 h to obtain the nano-montmorillonite composite viscosity reducer.

[0036] The molar ratio of glycidyl methacrylate and octadecylamine in step A1 is 1 mmol: 8 mmol, and the ratio of methanol, intermediate 1, sodium hydroxide and 1,4-butyric acid lactone is 250 mL: 0.2 g: 0.3 g: 0.95 g.

[0037] The ratio of montmorillonite, deionized water, and hexadecyltrimethylammonium bromide used in step A2 is 3g:60mL:1.9g.

[0038] The ratio of modified montmorillonite, xylene, intermediate 2, maleic anhydride and octadecylamine in step A3 is 2g:40mL:1.5mmol:1mmol:1.1mmol, the amount of maleic anhydride is 3mmol, and the amount of benzoyl peroxide is 0.8% of the mass of intermediate 2.

[0039] The oil-soluble surfactant is prepared by the following steps: Step B1: Phenol, boron trifluoride ether and n-hexane are mixed evenly. Under the conditions of 160 r / min, 55℃ and nitrogen gas, the mixture is stirred and highly active polyisobutylene is added. The temperature is raised to 70℃ and the reaction is carried out for 5 hours to obtain intermediate 3. Step B2: Mix intermediate 3 and toluene evenly, stir and add 3-(dimethylamino)propionyl chloride and triethylamine at a speed of 160 r / min and a temperature of 120℃, and react for 8 h. Then add 1-bromobutane and react for 10 h to obtain an oil-soluble surfactant.

[0040] The ratio of phenol, boron trifluoride ether, n-hexane and highly active polyisobutylene in step B1 is 15g:2g:100mL:50g, and the average relative molecular weight of the highly active polyisobutylene is 1000.

[0041] The ratio of intermediate 3, 3-(dimethylamino)propionyl chloride and 1-bromobutane in step B2 is 1 mmol: 1.1 mmol: 1.5 mmol.

[0042] Comparative Example 1: In this comparative example, intermediate 2 is replaced by intermediate 1, while the other steps are the same as in Example 1.

[0043] Comparative Example 2: Compared with Example 1, this comparative example does not add modified montmorillonite in step A3, but the other steps are the same.

[0044] Comparative Example 3: This comparative example uses phenol instead of oil-soluble surfactant compared to Example 1, with the other steps being the same.

[0045] Comparative Example 4: Compared with the Example, this comparative example uses intermediate 3 instead of oil-soluble surfactant, while the other steps are the same.

[0046] The high-efficiency oil-based wax inhibitors prepared in Examples 1-3 and Comparative Examples 1-4 were tested for wax resistance according to the standard SY / T6300-2024 "Technical Requirements for Wax Inhibitors and Removals for Oil Production". The test results are shown in Table 1. The wax resistance of the wax inhibitors at the same temperature was tested using the circulating wax tube method. The wax resistance rate E was calculated using the formula a = (m1 - m0) / m1, where E is the wax resistance rate (%), m1 is the amount of wax deposited in the oil sample without wax inhibitor (g), and m0 is the amount of wax deposited in the oil sample with wax inhibitor (g).

[0047] The high-efficiency oil-based wax removers and inhibitors prepared in Examples 1-3 and Comparative Examples 1-4 were tested for their wax dissolution rate according to the standard SY / T6300-2024 "Technical Requirements for Wax Removers and Inhibitors in Oil Production". The test results are shown in Table 1. 15 mL of wax remover and inhibitor was added to the wax dissolution test equipment, and the water bath temperature was 30℃. After the solution reached a constant temperature, a wax ball with a mass of m was placed into the wax remover and inhibitor solution, and the time t required for the wax ball to completely dissolve at room temperature was recorded. The wax dissolution rate v was calculated using the formula: v = m / t, where v is the wax dissolution rate (g / min), m is the mass of the wax ball (g), and t is the time required for the wax ball to completely dissolve (min).

[0048] The high-efficiency oil-based dewaxing and anti-waxing agents prepared in Examples 1-3 and Comparative Examples 1-4 were tested for their pour points according to SY / T0541-2009 "Determination of Pour Point of Crude Oil". The test results are shown in Table 1. The dewaxing and anti-waxing agents were mixed with crude oil at a mass ratio of 1:9 to prepare a sample. The sample was then heat-treated at 60°C and cooled at a rate of 0.5°C / min. The flowability of the sample was observed every 2°C until the sample stopped flowing after 5 seconds when the test tube was placed horizontally. This highest temperature was taken as the pour point of the crude oil.

[0049] Table 1

[0050] Table 1 shows that the high-efficiency oil-based wax inhibitors prepared in Examples 1-3 have a wax prevention rate in the range of 82.45%-88.75% and a wax dissolving rate in the range of 0.0876%-0.0914%. With the addition of the wax inhibitors, the flow resistance of crude oil decreases and the pour point decreases. This indicates that the present invention has good wax removal and prevention capabilities.

[0051] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a high-efficiency oil-based dewaxing and anti-waxing agent, characterized in that: Specifically, the steps include the following: Xylene, straight-run gasoline and oil-soluble surfactant are mixed and stirred, a fast penetrant is added and stirred evenly, a nano-montmorillonite composite viscosity reducer is added and stirred evenly to obtain a high-efficiency oil-based dewaxing and anti-waxing agent. The weight ratio of xylene, straight-run gasoline, oil-soluble surfactant, fast penetrant and nano-montmorillonite composite viscosity reducer mentioned in the step is 70-90:20-30:2-4:0.1-0.5:10-15.

2. The preparation method of the high-efficiency oil-based dewaxing agent according to claim 1, characterized in that: The aforementioned nano-montmorillonite composite viscosity reducer is prepared by the following steps: Step A1: Glycidyl methacrylate, octadecylamine and toluene are mixed evenly and reacted to obtain intermediate 1. Intermediate 1 is mixed with methanol and stirred, and sodium hydroxide and 1,4-butyryl lactone are added and reacted to obtain intermediate 2. Step A2: Disperse montmorillonite in deionized water, sonicate it, stir and add hexadecyltrimethylammonium bromide to react and obtain modified montmorillonite; Step A3: Disperse the modified montmorillonite in xylene, stir and add intermediate 2 and maleic anhydride, react, add benzoyl peroxide, heat and react again, add octadecylamine, react again, and obtain the nano-montmorillonite composite viscosity reducer.

3. The preparation method of a high-efficiency oil-based dewaxing agent according to claim 2, characterized in that: The molar ratio of glycidyl methacrylate and octadecylamine in step A1 is 1 mmol: 6-8 mmol, and the ratio of methanol, intermediate 1, sodium hydroxide and 1,4-butyric acid lactone is 250 mL: 0.2 g: 0.3 g: 0.95 g.

4. The preparation method of a high-efficiency oil-based dewaxing agent according to claim 2, characterized in that: The ratio of montmorillonite, deionized water, and hexadecyltrimethylammonium bromide used in step A2 is 3g:60mL:1.9g.

5. The preparation method of a high-efficiency oil-based dewaxing agent according to claim 2, characterized in that: The ratio of modified montmorillonite, xylene, intermediate 2, maleic anhydride and octadecylamine in step A3 is 2g:40mL:1.5mmol:1mmol:1.1mmol, and the amount of benzoyl peroxide is 0.5-0.8% of the mass of intermediate 2.

6. The preparation method of a high-efficiency oil-based dewaxing agent according to claim 1, characterized in that: Step B1: Phenol, boron trifluoride ether and n-hexane are mixed and stirred, and highly active polyisobutylene is added. The mixture is heated to carry out the reaction and intermediate 3 is obtained. Step B2: Mix intermediate 3 and toluene, add 3-(dimethylamino)propionyl chloride and triethylamine, and react. Add 1-bromobutane and react to obtain an oil-soluble surfactant.

7. The preparation method of a high-efficiency oil-based dewaxing agent according to claim 6, characterized in that: The ratio of phenol, boron trifluoride ether, n-hexane, and highly active polyisobutylene in step B1 is 15g:2g:100mL:50g.

8. The preparation method of a high-efficiency oil-based dewaxing agent according to claim 6, characterized in that: The ratio of intermediate 3, 3-(dimethylamino)propionyl chloride and 1-bromobutane in step B2 is 1 mmol: 1.1 mmol: 1.5 mmol.

9. A high-efficiency oil-based wax remover, characterized in that: Prepared according to any one of the preparation methods described in claims 1-8.

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