Crude oil nano-composite paraffin-control pour point depressant as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of petroleum industry, and particularly relates to a crude oil nano-composite paraffin-control pour point depressant as well as a preparation method and application thereof. The chemical structure of the crude oil nano-composite paraffin-control pour point depressant provided by the invention is shown as a formula I or a formula II. The crude oil nano-composite paraffin-control pour point depressant provided by the invention is mainly prepared from acrylate, vinyl acetate or maleic anhydride and the like under the initiation action of a catalyst by adopting an RAFT emulsion polymerization method, has an excellent paraffin-control effect and an effect of reducing the condensation point of wax-containing crude oil, can be prepared at a lower temperature (less than 100 DEG C), and is low in cost, stable in preparation process and suitable for industrial production. The method is suitable for industrial production. Wherein m is any integer between 14 and 30, and n is any integer between 6 and 15.

Description

Technical Field

[0001] This invention belongs to the field of petroleum industry technology, specifically relating to a crude oil nanocomposite anti-wax depressant, its preparation method, and its application. Background Technology

[0002] With the deepening development of oil fields, the wax content of low-viscosity, high-pour-point crude oil transported through pipelines has gradually increased, rising from below 5% to around 10%. In spring, autumn, and winter, some pipeline sections operate at peak wax precipitation temperatures, leading to a large amount of wax crystals precipitating and a surge in wax deposits during pipeline cleaning. Furthermore, the amount of wax during cleaning is unstable and shows an increasing trend. Adding pour point depressants to crude oil causes paraffin molecules to co-crystallize and precipitate with the pour point depressant polymers when the crude oil temperature reaches or falls below the wax crystallization temperature, forming wax crystals together. While adding pour point depressants to low-volume crude oil pipelines in winter can address the issue of safe operation at the pour point, it cannot prevent the increased wax precipitation caused by operating in the peak wax precipitation zone. If not addressed promptly, this can easily lead to pipeline blockage, causing pipeline solidification and impacting oil field production. Simultaneously, wax deposits in long-distance pipelines are removed to downstream storage tanks using pipeline cleaning tools, resulting in persistently high levels of solid waste from tank cleaning.

[0003] The use of effective wax-resistant pour point depressants can reduce the amount of oily waste, thereby reducing waste disposal and transportation costs, while increasing the volume of crude oil as a commodity and improving the efficiency of crude oil sales, resulting in considerable economic benefits.

[0004] Chinese invention patent application CN101602941A discloses a broad-spectrum crude oil anti-wax and pour point depressant. Agent A is prepared by reacting octadecyl acrylate, docosyl methacrylate, styrene, and maleic anhydride, and Agent B is prepared by reacting 3-ethyltoluene and fatty alcohol polyoxyethylene ether. Finally, the two are mixed to obtain the anti-wax and pour point depressant, which can effectively reduce the pour point and wax precipitation point of crude oil and improve the fluidity of crude oil. It has a good anti-wax and pour point depressant effect, but the reaction temperature is high, the energy consumption is large, and the cost is high.

[0005] Another Chinese invention patent application, CN106279514A, discloses a method for preparing a diesel pour point depressant, which synthesizes a high-carbon methacrylate and maleic anhydride copolymer pour point depressant in a batch reactor. However, this pour point depressant only has a good pour point depressing effect on diesel, and the synthesis process is complex, requiring a total reaction time of 20 hours under nitrogen protection.

[0006] Another Chinese invention patent application, CN110.577828A, discloses a nanoparticle anti-wax pour point depressant for oil wells, its preparation method, and its application. The specific components of the anti-wax pour point depressant include a wax crystal modifier, an emulsifier, a penetrant, a scale remover, a diluent, and water. It can adsorb and distort wax crystals in crude oil, preventing the further formation of wax crystal structures and prolonging the paraffin precipitation time in oil wells. However, it has poor stability and weak dispersion performance for wax crystals.

[0007] The measures to reduce wax blockage in long-distance crude oil pipelines generally involve heating, which consumes a lot of energy, increases equipment investment and labor costs, and has high management costs. Currently used crude oil pour point depressants interfere with the growth of wax crystals by improving their shape, preventing wax molecules from forming a spatial network structure, thereby lowering the pour point of crude oil. However, when operating in the peak wax precipitation area, a large amount of wax crystals still precipitate.

[0008] Therefore, there is an urgent need in this field for a pipeline crude oil anti-wax depressant that is stable in performance, has excellent effect, is easy to operate, has low production cost, and is suitable for industrial production. Summary of the Invention

[0009] This invention addresses the problems existing in the prior art by providing a crude oil nanocomposite anti-wax depressant, its preparation method, and its application.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A crude oil nanocomposite anti-wax and pour point depressant, with a chemical structure as shown in Formula I or Formula II:

[0012]

[0013] Where m is any integer between 14 and 30, and n is any integer between 6 and 15.

[0014] This invention also provides a method for preparing the above-mentioned crude oil nanocomposite anti-wax and pour point depressant, comprising the following steps:

[0015] (1) Mix acrylate, polar monomer, sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether to obtain a preemulsifier;

[0016] (2) Dissolve potassium persulfate in water to obtain an initiator;

[0017] (3) Heat part of the pre-emulsifier, add part of the initiator, and finally add the remaining pre-emulsifier and the remaining initiator simultaneously. React to obtain the product.

[0018] Preferably, the acrylate in step (1) includes octadecyl acrylate and dodecyl acrylate, and the polar monomer is selected from one or two of vinyl acetate and maleic anhydride.

[0019] Preferably, the fatty alcohol polyoxyethylene ether in step (1) is AEO-3, AEO-5, AEO-7 or AEO-9.

[0020] Preferably, the mixing speed in step (1) is 2000-4000 rpm, the mixing time is 3-10 min, and water needs to be added during the mixing.

[0021] More preferably, the mixing speed in step (1) is 2500-3500 rpm, and the mixing time is 4-8 min.

[0022] Preferably, the molar ratio of the acrylate to the polar monomer is 1:1-10.

[0023] Preferably, the sodium dodecyl sulfate accounts for 1.5-2.5% of the total mass of the acrylate and the polar monomer.

[0024] More preferably, the sodium dodecyl sulfate accounts for 2% of the total mass of the acrylate and the polar monomer.

[0025] Preferably, the fatty alcohol polyoxyethylene ether accounts for 0.5-1.5% of the total mass of the acrylate and polar monomer.

[0026] More preferably, the fatty alcohol polyoxyethylene ether accounts for 1% of the total mass of the acrylate and the polar monomer.

[0027] Preferably, the mass of potassium persulfate in step (2) accounts for 0.3-0.6% of the total mass of acrylate and polar monomer.

[0028] More preferably, the potassium persulfate accounts for 0.5% of the total mass of the acrylate and the polar monomer.

[0029] Preferably, the mass-to-volume ratio of potassium persulfate to water is 5-10 g: 100 mL.

[0030] Preferably, water is added to the pre-emulsifier in step (3), and the heating temperature is 70-90°C.

[0031] More preferably, the heating temperature in step (3) is 80°C.

[0032] Preferably, the time for adding part of the initiator is 20-40 minutes, and the time for simultaneously adding the remaining preemulsifier and the remaining initiator is 150-210 minutes.

[0033] More preferably, the time for adding part of the initiator is 30 minutes, and the time for simultaneously adding the remaining preemulsifier and the remaining initiator is 180 minutes.

[0034] Preferably, the reaction temperature in step (3) is 70-90℃, the reaction time is 1-3h, and after the reaction is completed, the temperature needs to be lowered to 25-35℃ for filtration and drying.

[0035] The present invention also provides the application of the above-mentioned crude oil nanocomposite anti-wax and pour point depressant or the crude oil nanocomposite anti-wax and pour point depressant prepared by the above preparation method in pipeline crude oil anti-wax and / or pour point depressant.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This invention employs the RAFT emulsion polymerization method to prepare a crude oil nanocomposite anti-wax and pour point depressant, mainly composed of acrylate, vinyl acetate, or maleic anhydride under the initiation of a catalyst. It has excellent anti-wax effect and can reduce the pour point of waxy crude oil. It can be produced at low cost and on a large scale at relatively low temperatures (<100℃). The preparation process is stable and suitable for industrial production. Attached Figure Description

[0038] Figure 1 The infrared image shows the crude oil nanocomposite anti-wax depressant prepared in Example 2.

[0039] Figure 2 The crude oil nanocomposite anti-wax and pour point depressant prepared in Example 2 1 H NMR spectrum. Detailed Implementation

[0040] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these examples are merely exemplary and do not constitute any limitation on the scope of the present invention. Unless otherwise specified, the methods, ingredients, and dosages involved in the following embodiments are conventional methods known to those skilled in the art.

[0041] It is worth noting that the raw materials used in this invention are all commercially available products, and octadecyl acrylate and dodecyl acrylate were purchased from Maclean's Reagent Company.

[0042] Example 1

[0043] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0044] (1) Mix octadecyl acrylate and dodecyl acrylate monomers in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.1 mol) and 200 mL of deionized water are added to a 500 mL beaker, and sodium dodecyl sulfate (0.856 g) of 2% of the total monomer mass and AEO-5 (0.428 g) of 1% of the total monomer mass are added. The mixture is sheared at 3000 rpm for 5 min to obtain a preemulsifier.

[0045] (2) Add potassium persulfate (0.214 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0046] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to room temperature. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula II—poly(octadecyl acrylate / docosahexadecyl acrylate-vinyl acetate).

[0047] Example 2

[0048] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0049] (1) Mix octadecyl acrylate and dodecyl acrylate monomers in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.1 mol) and 200 mL of deionized water are added to a 500 mL beaker, and sodium dodecyl sulfate (0.856 g) of 2% of the total monomer mass and AEO-7 (0.428 g) of 1% of the total monomer mass are added. The mixture is sheared at 3000 rpm for 5 min to obtain a preemulsifier.

[0050] (2) Add potassium persulfate (0.214 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0051] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 30 °C. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula II—poly(octadecyl acrylate / docosahexadecyl acrylate-vinyl acetate).

[0052] The crude oil nanocomposite anti-wax and pour point depressant prepared in this embodiment was characterized by infrared spectroscopy. Figure 1 ).

[0053] The crude oil nanocomposite anti-wax and pour point depressant prepared in this embodiment was characterized by proton nuclear magnetic resonance spectroscopy. Figure 2 ).

[0054] Example 3

[0055] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0056] (1) Mix octadecyl acrylate and dodecyl acrylate in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.1 mol) and 200 mL of deionized water are added to a 500 mL beaker, and sodium dodecyl sulfate (0.856 g) of 2% of the total monomer mass and AEO-9 (0.428 g) of 1% of the total monomer mass are added. The mixture is sheared at 3000 rpm for 5 min to obtain a preemulsifier.

[0057] (2) Add potassium persulfate (0.214 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0058] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 35 °C. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula II—poly(octadecyl acrylate / docosahexadecyl acrylate-vinyl acetate).

[0059] Example 4

[0060] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0061] (1) Mix octadecyl acrylate and dodecyl acrylate monomers at a 1:1 molar ratio to obtain a mixture (0.1 mol), maleic anhydride (0.1 mol) and 200 mL of deionized water are added to a 500 mL beaker, and sodium dodecyl sulfate (0.856 g) at 2% of the total monomer mass and AEO-7 (0.448 g) at 1% of the total monomer mass are added. The mixture is sheared at 3000 rpm for 5 min to obtain a preemulsifier.

[0062] (2) Add potassium persulfate (0.224 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0063] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 30 °C. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula II—poly(octadecyl acrylate / docosahexadecyl acrylate-maleic anhydride).

[0064] Example 5

[0065] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0066] (1) Mix octadecyl acrylate and dodecyl acrylate monomers in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.05 mol) and maleic anhydride (0.05 mol), and add 250 mL of deionized water to a 500 mL beaker. Add sodium dodecyl sulfate (0.896 g) at 2% of the total monomer mass and AEO-5 (0.448 g) at 1% of the total monomer mass. Shear at 3000 rpm for 5 min to obtain a preemulsifier.

[0067] (2) Add potassium persulfate (0.224 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0068] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 25 °C. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula I—poly(octadecyl acrylate / docosahexadecyl acrylate-vinyl acetate / maleic anhydride).

[0069] Example 6

[0070] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0071] (1) Mix octadecyl acrylate and dodecyl acrylate monomers in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.05 mol) and maleic anhydride (0.05 mol), and add 250 mL of deionized water to a 500 mL beaker. Add sodium dodecyl sulfate (0.896 g) at 2% of the total monomer mass and AEO-7 (0.448 g) at 1% of the total monomer mass. Shear at 3000 rpm for 5 min to obtain a preemulsifier.

[0072] (2) Add potassium persulfate (0.224 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0073] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 25 °C. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula I—poly(octadecyl acrylate / docosahexadecyl acrylate-vinyl acetate / maleic anhydride).

[0074] Example 7

[0075] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0076] (1) Mix octadecyl acrylate and dodecyl acrylate in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.05 mol) and maleic anhydride (0.05 mol), and add 250 mL of deionized water to a 500 mL beaker. Add sodium dodecyl sulfate (0.896 g) at 2% of the total monomer mass and AEO-9 (0.448 g) at 1% of the total monomer mass. Shear at 3000 rpm for 5 min to obtain a preemulsifier.

[0077] (2) Add potassium persulfate (0.224 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0078] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 25 °C. Filter with a 200-mesh filter cloth and dry to obtain the crude oil nanocomposite anti-wax depressant shown in Formula I—poly(octadecyl acrylate / docosahexadecyl acrylate-vinyl acetate / maleic anhydride).

[0079] Comparative Example 1

[0080] Similar to Example 6, except that the mixture of octadecyl acrylate and dodecyl acrylate monomers is not added in step (1).

[0081] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0082] (1) Add vinyl acetate monomer (0.05 mol) and maleic anhydride (0.05 mol) and 250 mL of deionized water to a 500 mL beaker, and add sodium dodecyl sulfate (0.184 g) at 2% of the total monomer mass and AEO-7 (0.92 g) at 1% of the total monomer mass. Shear at 3000 rpm for 5 min to obtain a pre-emulsifier.

[0083] (2) Add potassium persulfate (0.5g) at a mass of 0.5% of the total mass of the monomer to a 5mL centrifuge tube, and add 1mL of deionized water. Sonicate for 30min to dissolve it completely to obtain the initiator.

[0084] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them dropwise simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 25 °C. Filter with a 200-mesh filter cloth and dry to obtain the final product.

[0085] Comparative Example 2

[0086] Same as Example 6, except that AEO-7 is replaced with AES in step (1).

[0087] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0088] (1) Mix octadecyl acrylate and dodecyl acrylate in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.05 mol) and maleic anhydride (0.05 mol), and add 250 mL of deionized water to a 500 mL beaker. Add sodium dodecyl sulfate (0.896 g) at 2% of the total monomer mass and AES (0.448 g) at 1% of the total monomer mass. Shear at 3000 rpm for 5 min to obtain a preemulsifier.

[0089] (2) Add potassium persulfate (0.224 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0090] (3) Add 20% of the preemulsifier and about 10 mL of deionized water to a 250 mL three-necked flask, heat to 80 °C, and then add 20% of the initiator dropwise over 30 min. Place the remaining 80% of the preemulsifier and the remaining 80% of the initiator in two constant-pressure dropping funnels and add them dropwise simultaneously for 3 h. After the addition is complete, continue the reaction for 2 h. After the reaction is complete, allow it to cool naturally to 25 °C. Filter with a 200-mesh filter cloth and dry to obtain the final product.

[0091] Comparative Example 3

[0092] Similar to Example 6, the only difference is that the raw materials are added in step (3) in one step.

[0093] A method for preparing a crude oil nanocomposite anti-wax and pour point depressant includes the following steps:

[0094] (1) Mix octadecyl acrylate and dodecyl acrylate in a 1:1 molar ratio to obtain a mixture (0.1 mol), vinyl acetate (0.05 mol) and maleic anhydride (0.50 mol), and add 250 mL of deionized water to a 500 mL beaker. Add sodium dodecyl sulfate (0.896 g) at 2% of the total monomer mass and AEO-7 (0.448 g) at 1% of the total monomer mass. Shear at 3000 rpm for 5 min to obtain a preemulsifier.

[0095] (2) Add potassium persulfate (0.224 g) at a mass of 0.5% of the total mass of the monomer to a 10 mL centrifuge tube, and add 4 mL of deionized water. Sonicate for 30 min to dissolve it completely to obtain the initiator.

[0096] (3) Mix the preemulsifier and initiator and react for 2 hours. After the reaction is complete, cool naturally to 25°C. Filter with a 200-mesh filter cloth and dry to obtain the final product.

[0097] Test case

[0098] The performance of the crude oil nanocomposite anti-wax depressants prepared in Examples 1-7 and Comparative Examples 1-3 was compared.

[0099] Experimental methods: First, the crude oil nanocomposite anti-wax pour point depressant prepared in Examples 1-7 and Comparative Examples 1-3 was diluted with No. 100 solvent oil, preheated at 70℃ for 1 hour and stirred to completely dissolve it into a mother solution with an effective concentration of 20%; a small amount of the mother solution was weighed and diluted 100 times with No. 3 aerospace kerosene to obtain a dilute solution with an effective concentration of 0.2%; 100g of waxy crude oil from the abdominal oilfield and 1.5g of the crude oil nanocomposite anti-wax pour point depressant solution were weighed, stirred for 20 minutes, and then placed in a constant temperature heating box at 50℃ for 3 hours to fully dissolve and disperse it; finally, the pour point of the waxy crude oil and the waxy crude oil after the addition of the agent was tested using a pour point tester, and the anti-wax rate and pour point change were tested using a differential scanning calorimeter (DSC) and a petroleum pour point tester.

[0100] The results are shown in Table 1.

[0101] Table 1 Test Results

[0102]

[0103]

[0104] For the same waxy crude oil, Comparative Example 1 shows that the crude oil nanocomposite anti-wax and pour point depressant prepared by adding acrylate has better anti-wax effect and pour point reduction performance; Comparative Example 2 shows that the crude oil nanocomposite anti-wax and pour point depressant prepared by adding ionic emulsifier has a reduced anti-wax effect and pour point reduction performance, possibly due to the introduction of Na. + Ions affect the degree of polymerization during the polymerization reaction, thus impacting the product's performance. As shown in Comparative Example 3, the anti-waxing effect and pour point reduction of the crude oil nanocomposite anti-waxing and pour point depressant prepared by the one-step method are greatly affected. This may be because changing the reaction conditions leads to a significant change in the degree of polymerization of the final product, thus affecting its performance.

[0105] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A crude oil nanocomposite anti-wax and pour point depressant, characterized in that, The chemical structure is shown in Formula I or Formula II: Where m is any integer between 14 and 30, and n is any integer between 6 and 15.

2. A method for preparing the crude oil nanocomposite anti-wax and pour point depressant as described in claim 1, characterized in that, Includes the following steps: (1) Mix acrylate, polar monomer, sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether to obtain a preemulsifier; (2) Dissolve potassium persulfate in water to obtain an initiator; (3) Heat part of the pre-emulsifier, add part of the initiator, and finally add the remaining pre-emulsifier and the remaining initiator simultaneously. React to obtain the product.

3. The preparation method according to claim 2, characterized in that, The acrylates mentioned in step (1) include octadecyl acrylate and dodecyl acrylate.

4. The preparation method according to claim 2, characterized in that, The polar monomer mentioned in step (1) is selected from one or both of vinyl acetate and maleic anhydride.

5. The preparation method according to claim 3 or 4, characterized in that, The molar ratio of the acrylate to the polar monomer is 1:1-10.

6. The preparation method according to claim 2, characterized in that, The fatty alcohol polyoxyethylene ether mentioned in step (1) is AEO-3, AEO-5, AEO-7 or AEO-9.

7. The preparation method according to claim 2, characterized in that, The mixing speed in step (1) is 2000-4000 rpm, the mixing time is 3-10 min, and water needs to be added during the mixing.

8. The preparation method according to claim 7, characterized in that, The sodium dodecyl sulfate accounts for 1.5-2.5% of the total mass of the acrylate and polar monomers.

9. The preparation method according to claim 7, characterized in that, The fatty alcohol polyoxyethylene ether accounts for 0.5-1.5% of the total mass of acrylate and polar monomer.

10. The preparation method according to claim 2, characterized in that, The mass of potassium persulfate mentioned in step (2) accounts for 0.3-0.6% of the total mass of acrylate and polar monomer.

11. The preparation method according to claim 10, characterized in that, The mass-to-volume ratio of potassium persulfate to water is 5-10 g: 100 mL.

12. The preparation method according to claim 2, characterized in that, In step (3), water needs to be added to the pre-emulsifier and the heating temperature is 70-90℃.

13. The preparation method according to claim 12, characterized in that, The initiator is added at a time of 20-40 minutes.

14. The preparation method according to claim 12, characterized in that, The time for simultaneously adding the remaining preemulsifier and the remaining initiator is 150-210 min.

15. The preparation method according to claim 2, characterized in that, The reaction temperature in step (3) is 70-90℃, the reaction time is 1-3h, and after the reaction is completed, it needs to be cooled to 25-35℃, filtered and dried.

16. The application of the crude oil nanocomposite anti-wax and pour point depressant as described in claim 1 or the crude oil nanocomposite anti-wax and pour point depressant prepared by any one of claims 2-15 in pipeline crude oil anti-wax and / or pour point depressant.

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