Drag reduction composition, preparation method thereof and pipeline drag reducer

Abstract

The invention discloses a drag reduction composition, a preparation method thereof and a pipeline drag reducer. The drag reduction composition comprises the following components in parts by mass: 10-21 parts of a polymethacrylate compound, 6-18 parts of a dispersing agent and 2-9 parts of a lubricating agent, the lubricant is prepared from one or more of glycerol triacetate, glycerol tripropionate, pentaerythritol tetraacetate and dipentaerythritol hexaacetate. The drag reduction composition provided by the invention comprises the polymethacrylate compound matched with the dispersing agent and the specific lubricant, and the components jointly form a suspension system with stable properties, so that the degree of freedom of motion among polymer molecules can be increased, and the occurrence of an agglomeration phenomenon is reduced. When the drag reduction composition is added into a pipeline containing crude oil or product oil, polymer molecules can be stretched, folding and curling phenomena of the polymer molecules can be reduced, and a good drag reduction effect can be quickly achieved.

Description

Technical Field

[0001] The present invention relates to the field of chemical materials, and particularly to a drag reduction composition, a preparation method thereof, and a pipeline drag reducer. Background Art

[0002] When petroleum and related products such as crude oil or refined oil are transported through pipelines, fluid will inevitably generate flow friction resistance. This will lead to a reduction in pipeline transportation capacity, affect the safe operation of pipelines, and increase the pipeline use and maintenance costs. And pipeline drag reducers are additives that can significantly reduce the friction resistance related to turbulence generated when fluids pass through pipelines.

[0003] In actual use, traditional pipeline drag reducers include suspensions of long-chain polymers, which are prone to curling and folding in slurry and cannot unfold, resulting in weakened drag reduction ability and extended time to achieve the expected drag reduction effect. Summary of the Invention

[0004] Based on this, it is necessary to provide a drag reduction composition, a preparation method thereof, and a pipeline drag reducer that can quickly achieve a good drag reduction effect.

[0005] The present application provides a drag reduction composition, which in terms of parts by mass, comprises 10 - 21 parts of polymethacrylate compounds, 6 - 18 parts of dispersants, and 2 - 9 parts of lubricants;

[0006] The lubricants include one or more of glyceryl triacetate, glyceryl tripropionate, pentaerythritol tetraacetate, and dipentaerythritol hexaacetate.

[0007] In one embodiment, the polymethacrylate compounds include one or more of isooctyl polymethacrylate, 2-hydroxyethyl polymethacrylate, and 2-hydroxypropyl polymethacrylate.

[0008] In one embodiment, the dispersants include one or more of 2-methyl-2,4-pentanediol, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol, and propylene glycol diglycidyl ether.

[0009] In one embodiment, the molecular weight of the polymethacrylate compounds is 300,000 - 500,000.

[0010] The present application also provides a preparation method of a drag reduction composition, comprising the following steps:

[0011] Prepare materials according to the composition of the above-mentioned drag reduction composition;

[0012] Mix the polymethacrylate compounds, the dispersants, and the lubricants.

[0013] In one embodiment, the preparation method of the polymethacrylate compound includes bulk polymerization.

[0014] In one embodiment, the preparation method of the polymethacrylate compound includes the following steps:

[0015] The methacrylate compound is prepared into the polymethacrylate compound by bulk polymerization under the catalysis of a catalyst.

[0016] In one embodiment, the mass ratio of the methacrylate compound to the catalyst is (120 - 220) : (1 - 4).

[0017] In one embodiment, the bulk polymerization method satisfies one or both of the following conditions:

[0018] (1) The temperature of the bulk polymerization method is 80°C - 110°C;

[0019] (2) The time of the bulk polymerization method is 5h - 10h.

[0020] Furthermore, the present application provides a pipeline drag reducer, which includes the drag reduction composition as described above.

[0021] The drag reduction composition provided by the present application includes a polymethacrylate compound, a dispersant, and a specific lubricant. The above components together form a suspension system with stable properties, which can increase the freedom of movement between polymer molecules and reduce the occurrence of agglomeration phenomena. When the above drag reduction composition is added to a pipeline containing crude oil or refined oil, it helps to stretch the polymer molecules, reduce the folding and curling phenomena of the polymer molecules, and quickly achieve a good drag reduction effect. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0023] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. Among them, the same reference numerals represent the same parts in the following description.

[0024] Figure 1 For the gel permeation chromatography characterization of the polymethacrylate compound in Example 1, the ordinate MV represents the refractive index difference between the sample and the solvent. Detailed Description of the Embodiments

[0025] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] The term "and / or" as used herein includes any one of two or more related listed items, as well as any and all combinations of the related listed items. The any and all combinations include any two related listed items, any more related listed items, or the combination of all related listed items. For example, "A and / or B" includes three parallel options: A, B, and "the combination of A and B".

[0028] In this document, unless otherwise stated, "one or more" means any one of the listed items or any combination of the listed items. Similarly, in other cases where "one or more" and other expressions indicating "one or more" are used, the same understanding shall be made unless otherwise stated.

[0029] In this document, words such as "further", "even further", "in particular", "for example", "such as", "example", "exemplification" are used for descriptive purposes, indicating that there is a connection in the content covered between the different technical solutions before and after, but should not be understood as a limitation on the previous technical solution, nor as a limitation on the protection scope of this document. In this document, unless otherwise stated, A (such as B) means that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0030] In this document, "optionally", "optional", "option" mean that it can be either present or absent, that is, any one of the two parallel options of "present" or "absent" is selected. If "optional" appears in multiple places in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction relationship, each "optional" is independent. In this application, descriptions such as "optionally contain", "optionally include" mean "contain or not contain". "Optional component X" means that component X is present or absent, or means that it contains or does not contain this component X.

[0031] In this text, in "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only for descriptive purposes and cannot be construed as indicating or implying relative importance or quantity, nor can they be construed as implicitly specifying the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumerative description and should be understood not to constitute a closed limitation on quantity.

[0032] In this text, among the technical features described in an open-ended manner, it includes a closed technical solution composed of the listed features, and also includes an open technical solution containing the listed features.

[0033] In this text, regarding a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the selectable numerical values within this numerical interval is considered continuous and includes the two numerical endpoints of this numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within this numerical interval, it includes the two endpoint integers of this numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in this text should be understood to include any and all sub-ranges subsumed therein. The "numerical value" in this numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" allows for a broad inclusion of numerical interval types such as a percentage interval, a ratio interval, a ratio range interval, etc.

[0034] In this text, the term "room temperature" or "normal temperature" generally refers to 4°C to 35°C, such as 20°C ± 5°C. In some embodiments of this text, "room temperature" or "normal temperature" refers to 10°C to 30°C. In some embodiments of this text, "room temperature" or "normal temperature" refers to 20°C to 30°C.

[0035] In this text, when a method process involves multiple steps, unless there are clear different descriptions in this text, the execution of these steps has no strict order limitation, and it can be executed in an order other than the described one. Moreover, any step can include multiple sub-steps or multiple stages. These sub-steps or stages do not necessarily need to be executed at the same moment, but can be executed at different moments, and their execution order does not necessarily need to be sequential, but can be executed alternately or simultaneously with other steps or a part of the sub-steps or stages of other steps.

[0036] This application provides a drag reduction composition, and by mass parts, the composition includes 10 to 21 parts of a polymethacrylate compound, 6 to 18 parts of a dispersant, and 2 to 9 parts of a lubricant;

[0037] The lubricant includes one or more of glyceryl triacetate, glyceryl tripropionate, pentaerythritol tetraacetate, and dipentaerythritol hexaacetate.

[0038] The drag reduction composition provided by this application includes a polymethacrylate compound, a dispersant, and a specific lubricant. The above components together form a suspension system with stable properties, which can increase the degree of freedom of movement between polymer molecules and reduce the occurrence of agglomeration. When the above drag reduction composition is added to a pipeline containing crude oil or refined oil, it helps to stretch the polymer molecules, reduce the folding and curling of the polymer molecules, and quickly achieve a good drag reduction effect.

[0039] Furthermore, the drag reduction composition, by mass, comprises 12 - 20 parts of a polymethacrylate compound, 7 - 17 parts of a dispersant, and 3 - 8 parts of a lubricant.

[0040] In a specific example, the polymethacrylate compound includes one or more of isooctyl polymethacrylate, 2 - hydroxyethyl polymethacrylate, and 2 - hydroxypropyl polymethacrylate.

[0041] In a specific example, the dispersant includes one or more of 2 - methyl - 2,4 - pentanediol, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol, and propylene glycol diglycidyl ether.

[0042] It can be understood that the above - mentioned dispersant and lubricant can fill the voids between polymer molecules, improve the dispersion efficiency of the drag reduction composition, and increase the drag reduction ability.

[0043] Furthermore, the dispersant includes an alcohol - type dispersant and an ether - type dispersant. It can be understood that the alcohol - type dispersant includes one or both of 2 - methyl - 2,4 - pentanediol and diethylene glycol, and the ether - type dispersant includes one or more of ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, and propylene glycol diglycidyl ether. Specifically, the dispersant includes the alcohol - type dispersant and the ether - type dispersant in a mass ratio of (15 - 45):(50 - 120).

[0044] In a specific example, the molecular weight of the polymethacrylate compound is 300,000 - 500,000.

[0045] Specifically, the molecular weight of the polymethacrylate compound can be, but is not limited to, 300,000, 310,000, 320,000, 330,000, 340,000, 350,000, 360,000, 370,000, 380,000, 390,000, 400,000, 410,000, 420,000, 430,000, 440,000, 450,000, 460,000, 470,000, 480,000, 490,000, or 500,000.

[0046] This application also provides a preparation method of a drag reduction composition, including the following steps:

[0047] Prepare materials according to the composition of the drag reduction composition described above;

[0048] Mix polymethacrylate compounds, dispersants and lubricants.

[0049] In a specific example, the preparation method of the polymethacrylate compound includes bulk polymerization.

[0050] In a specific example, the preparation method of the polymethacrylate compound includes the following steps:

[0051] The methacrylate compound is catalyzed by a catalyst and the polymethacrylate compound is prepared by bulk polymerization.

[0052] In a specific example, the mass ratio of the methacrylate compound to the catalyst is (120 - 220) : (1 - 4).

[0053] It can be understood that the methacrylate compound and the catalyst are carried out in an organic solvent. Further, the mass ratio of the methacrylate compound, the catalyst and the organic solvent is (120 - 220) : (1 - 4) : (120 - 220).

[0054] Further, the mass ratio of the methacrylate compound to the catalyst is (120 - 200) : (1 - 3).

[0055] Specifically, the organic solvent can be but is not limited to one or more of isooctanol, isoamyl alcohol and ethylene glycol monobutyl ether. The catalyst can be but is not limited to one or more of ammonium persulfate, azobisisobutyronitrile and benzoyl peroxide.

[0056] In a specific example, the temperature of the bulk polymerization is 80°C - 110°C.

[0057] Specifically, the temperature of the bulk polymerization can be but is not limited to 80°C, 85°C, 90°C, 95°C or 100°C.

[0058] In a specific example, the time of the bulk polymerization is 5h - 10h.

[0059] Specifically, the time of the bulk polymerization can be but is not limited to 5h, 6h, 7h, 8h, 9h or 10h.

[0060] This application uses bulk polymerization to prepare polymethacrylate compounds without a low-temperature grinding process.

[0061] Further, this application also provides a pipeline drag reducer, which includes the drag reduction composition as described above.

[0062] Understandably, a pipeline drag reducer or drag reduction composition is used in pipelines for oil products. The oil products can be, but are not limited to, crude oil or refined oil products.

[0063] The following further describes the present application in detail with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. For the experimental methods without specific conditions noted in the following embodiments, the guidance given in the present application is preferentially referred to. It can also be carried out according to the experimental manuals or conventional conditions in the art, or according to the conditions recommended by the manufacturers, or by referring to the experimental methods known in the art.

[0064] In the following specific embodiments, regarding the measurement parameters of raw material components, without special instructions, there may be slight deviations within the weighing accuracy range. Regarding temperature and time parameters, acceptable deviations caused by instrument test accuracy or operation accuracy are allowed. "Normal temperature" refers to 25°C; "normal pressure" refers to 100 KPa or 101 KPa.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] Example 1

[0067] This example provides a drag reduction composition, and its preparation method includes the following steps:

[0068] (a) Bulk polymerization: Use nitrogen to displace the air in a 1 L flask completely, and add 198 g of isooctyl methacrylate (purchased from Macklin Co., Ltd.), 2.28 g of ammonium persulfate, and 198 g of isooctanol. Start stirring and react at 90°C for 6 h to obtain the polymerization product polyisooctyl methacrylate, with an Mn molecular weight of approximately 390,000.

[0069] (b) Solution compounding: Mix all the polymerization product polyisooctyl methacrylate prepared in (a) above with 39.6 g of 2-methyl-2,4-pentanediol, 118.8 g of ethylene glycol monobutyl ether, and 79.2 g of glyceryl triacetate thoroughly to form a stable suspension system, thereby obtaining the drag reduction composition.

[0070] As Figure 1 shown is the gel permeation chromatography characterization (GPC) of the polyacrylate compound in Example 1. The vertical coordinate MV represents the refractive index difference between the sample and the solvent. Table 1 shows the GPC results.

[0071] Table 1

[0072]

[0073] Example 2

[0074] This example provides a drag reduction composition, and its preparation method includes the following steps:

[0075] (a)Bulk polymerization: Use nitrogen to displace the air in a 500 mL flask completely, add 130 g of 2-hydroxyethyl methacrylate (H810855) purchased from Macklin, 2.28 g of ammonium persulfate, and 130 g of isooctanol. Start stirring and react at 100 °C for 8 h to obtain the polymerization product poly(2-hydroxyethyl methacrylate), with a molecular weight of approximately 350,000.

[0076] (b)Solution compounding: Thoroughly mix all of the polymerization product poly(2-hydroxyethyl methacrylate) prepared in step (a) above with 18.6 g of 2-methyl-2,4-pentanediol, 55.8 g of ethylene glycol monobutyl ether, and 37.2 g of glyceryl triacetate to form a stable suspension system, thereby obtaining the drag reduction composition.

[0077] Example 3

[0078] This example provides a drag reduction composition, and its preparation method includes the following steps:

[0079] (a)Bulk polymerization: Use nitrogen to displace the air in a 500 mL flask completely, add 144 g of 2-hydroxypropyl methacrylate (H811150) purchased from Macklin, 2.28 g of ammonium persulfate, and 144 g of isooctanol. Start stirring and react at 100 °C for 8 h to obtain the polymerization product poly(2-hydroxypropyl methacrylate), with a molecular weight of approximately 360,000.

[0080] (b)Solution compounding: Thoroughly mix all of the polymerization product poly(2-hydroxypropyl methacrylate) prepared in step (a) above with 20.6 g of 2-methyl-2,4-pentanediol, 61.8 g of ethylene glycol monobutyl ether, and 41.2 g of glyceryl triacetate to form a stable suspension system, thereby obtaining the drag reduction composition.

[0081] Example 4

[0082] This example provides a drag reduction composition, and its preparation method includes the following steps:

[0083] (a)Bulk polymerization: Use nitrogen to displace the air in a 1 L flask completely, add 198 g of isooctyl methacrylate (E808681) purchased from Macklin, 2.28 g of ammonium persulfate, and 198 g of isooctanol. Start stirring and react at 90 °C for 6 h to obtain the polymerization product poly(isooctyl methacrylate), with a molecular weight of approximately 390,000.

[0084] (b)Solution compounding: Thoroughly mix all the polymethacrylate isooctyl ester polymerization products prepared in the above step (a) with 39.6 g of 2-methyl-2,4-pentanediol, 118.8 g of ethylene glycol monobutyl ether, and 79.2 g of glyceryl tripropionate to form a stable suspension system, thus obtaining the drag reduction composition.

[0085] Example 5

[0086] This example provides a drag reduction composition, and its preparation method includes the following steps:

[0087] (a)Bulk polymerization: Use nitrogen to displace the air in a 1 L flask completely, add 198 g of isooctyl methacrylate (purchased from Macklin Co., Ltd., product number E808681), 2.28 g of ammonium persulfate, and 198 g of isooctanol. Start stirring and react at 90 °C for 6 h to obtain the polymerization product polymethacrylate isooctyl ester, with a molecular weight of approximately 390,000.

[0088] (b)Solution compounding: Thoroughly mix all the polymethacrylate isooctyl ester polymerization products prepared in the above step (a) with 39.6 g of ethylene glycol diglycidyl ether, 118.8 g of ethylene glycol monobutyl ether, and 79.2 g of glyceryl triacetate to form a stable suspension system, thus obtaining the drag reduction composition.

[0089] Example 6

[0090] This example provides a drag reduction composition, and its preparation method includes the following steps:

[0091] (a)Bulk polymerization: Use nitrogen to displace the air in a 1 L flask completely, add 198 g of isooctyl methacrylate (purchased from Macklin Co., Ltd., product number E808681), 2.28 g of ammonium persulfate, and 198 g of isooctanol. Start stirring and react at 90 °C for 6 h to obtain the polymerization product polymethacrylate isooctyl ester, with a molecular weight of approximately 390,000.

[0092] (b)Solution compounding: Thoroughly mix all the polymethacrylate isooctyl ester polymerization products prepared in the above step (a) with 39.6 g of 2-methyl-2,4-pentanediol, 118.8 g of diethylene glycol, and 79.2 g of glyceryl triacetate to form a stable suspension system, thus obtaining the drag reduction composition.

[0093] Comparative Example 1

[0094] This comparative example provides a drag reduction composition, and its preparation method includes the following steps:

[0095] Under nitrogen protection, the set temperature of the reaction kettle is -5°C. Add 20 mol of α-dodecene into the polymerization reaction kettle and mix well. Then add 0.01 mol of Ziegler-Natta catalyst and 0.03 mol of triethylaluminum, and react for 72 h. After the reaction is completed, seal the product, freeze it at -40°C thoroughly, and then crush it in a refrigerated sample mill. Based on 100 parts by mass, mix 45 parts of the crushed product, 45.2 parts of heptanol, 10 parts of triacontanol, and 0.8 parts of NP-10 surfactant evenly to obtain the drag reduction composition.

[0096] Comparative Example 2

[0097] This comparative example provides a drag reduction composition, and its preparation method includes the following steps:

[0098] Under nitrogen protection, the set temperature of the reaction kettle is -5°C. Add 2 mol of α-octene and 18 mol of α-dodecene into the polymerization reaction kettle and mix well. Then add 0.01 mol of Ziegler-Natta catalyst TiCl 4 / MgCl 2 , 0.03 mol of triethylaluminum, and 0.01 mol of diisobutyl 2,3-diisopropyl succinate, and react for 72 h. After the reaction is completed, seal the product, freeze it at -40°C thoroughly, and then crush it in a refrigerated sample mill. Based on 100 parts by mass, mix 45 parts of the crushed product, 45.2 parts of heptanol, 10 parts of triacontanol, and 0.8 parts of NP-10 surfactant evenly to obtain the drag reduction composition.

[0099] Comparative Example 3

[0100] This comparative example provides a drag reduction composition, and its preparation method includes the following steps:

[0101] (a) Bulk polymerization: Use nitrogen to displace the air in a 1 L flask completely, add 198 g of isooctyl methacrylate (purchased from Macklin), 2.28 g of ammonium persulfate, and 198 g of isooctanol. Start stirring and react at 90°C for 6 h to obtain the polymerization product polyisooctyl methacrylate with a molecular weight of about 390,000.

[0102] (b) Solution compounding: Mix all the polymerization product polyisooctyl methacrylate prepared in (a) above with 39.6 g of 2-methyl-2,4-pentanediol, 118.8 g of diethylene glycol, and 79.2 g of glycerol monooleate evenly to form a stable suspension system and obtain the drag reduction composition.

[0103] The drag reduction effect was tested in accordance with the SY / T 6578-2003 standard. The drag reduction compositions of the above-mentioned examples and comparative examples were tested with No. 0 diesel. The drag reduction rate (DR%) can be calculated by the formula DR% = (△P 0 —△P r ) / △P 0 × 100%, where △P 0 is the frictional pressure drop at both ends of the pipeline without adding the drag reduction composition, in Pa; △P r is the frictional pressure drop at both ends of the pipeline under the same flow rate (flow velocity) after adding the additive, in Pa. The time to reach the maximum drag reduction rate was measured with a calibrated stopwatch. The drag reduction effects of the drag reduction compositions of the examples and comparative examples are summarized in Table 2 below.

[0104] Table 2

[0105]

[0106] From the comparative examples of the drag reduction compositions of the above-mentioned examples and comparative examples, it can be seen that the drag reduction composition of the present application has a significant improvement in the drag reduction effect and the time to reach the maximum drag reduction effect compared with other polymer drag reducers of Comparative Example 1 to Comparative Example 3. Comparative Example 3 further shows that only an appropriate lubricant can improve the drag reduction effect of the drag reduction composition. Moreover, through further comparison of the examples, it can be found that in addition to using polymethacrylate compounds and specific lubricants, the combined use of alcohol compounds and ether compounds as dispersants can further improve the drag reduction effect of the drag reduction composition and increase the time to reach the maximum drag reduction rate.

[0107] The drag reduction composition provided by the present application includes a polymethacrylate compound in combination with a dispersant and a specific lubricant. The above components together form a suspension system with stable properties, which can increase the degree of freedom of movement between polymer molecules and reduce the occurrence of agglomeration. When the above drag reduction composition is added to a pipeline containing crude oil or refined oil, it helps to stretch the polymer molecules, reduce the folding and curling of polymer molecules, and quickly achieve a good drag reduction effect.

[0108] The above-described embodiments merely represent several implementation manners of the present invention, which are convenient for understanding the technical solution of the present invention specifically and in detail, but should not be construed as a limitation on the protection scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solution provided by the present invention are all within the protection scope of the appended claims of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the content of the appended claims, and the specification and the drawings can be used to explain the content of the claims.

Claims

1. A drag reducing composition, characterized in that: The composition includes, by weight, 10 to 21 parts of a polymethacrylate compound, 6 to 18 parts of a dispersant, and 2 to 9 parts of a lubricant; The lubricant includes one or more of triacetin, tripropionin, pentaerythritol tetraacetate, and dipentaerythritol hexaacetate.

2. The drag reducing composition according to claim 1, characterized in that The polymethacrylate compound includes one or more of poly(isooctyl methacrylate), poly(hydroxyethyl methacrylate) and poly(hydroxypropyl methacrylate).

3. The drag reducing composition according to claim 1, characterized in that The dispersant includes one or more of 2-methyl-2,4-pentanediol, ethylene glycol butyl ether, diethylene glycol methyl ether, diethylene glycol and propylene glycol diglycidyl ether.

4. The drag reducing composition according to any one of claims 1 to 3, characterized in that: The molecular weight of the polymethacrylate compound is 300,000 to 500,000.

5. A method for preparing a drag reducing composition, characterized in that: The following steps are involved: The composition and preparation of the drag reducing composition according to any one of claims 1 to 4; The polymethacrylate compound, the dispersant and the lubricant are mixed.

6. The preparation method according to claim 5, characterized in that: The preparation method of the polymethacrylate compound comprises a bulk polymerization method.

7. The preparation method according to claim 6, characterized in that: The preparation method of the polymethacrylate compound comprises the following steps: The polymethacrylate compound is prepared by bulk polymerization of the methacrylate compound under the catalysis of a catalyst.

8. The preparation method according to claim 7, characterized in that: The mass ratio of the methacrylate compound to the catalyst is (120-220): (1-4).

9. The preparation method according to any one of claims 6 to 8, characterized in that The bulk polymerization method satisfies one or both of the following conditions: (1) The temperature of the bulk polymerization method is 80°C to 110°C; (2) The bulk polymerization time is 5h~10h.

10. A pipeline drag reducing agent, characterized in that: Comprising the drag reducing composition as described in any one of claims 1 to 4.

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