Slippery water system based on amphiphilic polymer and preparation method thereof

Abstract

The present invention relates to a slippery water system based on an amphiphilic polymer, comprising the following raw materials prepared by weight: 0.05-0.5wt% of a suspended drag reducer, 0.1-1.0wt% of a clay stabilizer, 0.3-1.5wt% of a drainage aid, and the balance being water; the suspended drag reducer is prepared by weight: 40% of an amphiphilic polymer, 3% of an organic montmorillonite, and the balance being white oil; the amphiphilic polymer is prepared by acrylamide, acrylonitrile, a cationic hydrophobic monomer, and an aggregate; the aggregate is a mesoporous carbon nanosphere loaded with 2-acrylamide-2-methylpropanesulfonic acid. A preparation method for a slippery water system based on an amphiphilic polymer is also disclosed. The present invention achieves the following beneficial effects: hydrophobic association makes the drag reducer in this article lower in dosage than a traditional suspended drag reducer, and the addition of aggregate makes the network structure formed by the amphiphilic polymer in the aqueous solution more stable, thereby having better anti-eddy current drag reduction capability, and the cationic amphiphilic polymer also makes the prepared slippery water have high salt resistance.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield mining auxiliary agents, in particular to temperature-resistant and salt-resistant slick water based on amphiphilic polymers and a preparation method thereof. Background Art

[0002] Slickwater fracturing fluid is a common fracturing fluid system for hydraulic fracturing of shale oil and gas reservoirs. In order to avoid energy loss in the pipeline, slickwater is required to have low friction resistance. Drag reducers are key components in slickwater, which can reduce the friction resistance of fluid flowing in the pipeline.

[0003] At present, the most widely used water-based drag reducer is a polyacrylamide drag reducer produced by copolymerization of a variety of different monomers, which is then mixed with water to form slippery water.

[0004] After preparation, slippery water is mainly used to carry quartz sand, expanded clay and other materials with rigid properties into the stratum. Therefore, under the premise of reducing construction friction, it is also hoped that slippery water will have good supporting performance for materials such as quartz sand and expanded clay, so that they can settle slowly so as to enter deep strata and prevent sand blockage. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a temperature-resistant and salt-resistant slippery water based on amphiphilic polymers and a preparation method thereof, which solves the problem that the existing slippery water prepared with ordinary polymers as drag reducing agents is not resistant to high salt, and solves the problem that proppants such as quartz sand and expanded clay settle quickly in slippery water.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] (First aspect)

[0008] The slippery water system based on amphiphilic polymer is prepared by the following raw materials in parts by weight: 0.05-0.5wt% of a suspended drag reducer, 0.1-1.0wt% of a clay stabilizer, 0.3-1.5wt% of a drainage aid, and the balance is water;

[0009] The suspension drag reducer is prepared from the following raw materials in parts by mass: 40% of amphiphilic polymer, 3% of organic montmorillonite, and the balance of white oil;

[0010] The amphiphilic polymer is prepared from acrylamide, acrylonitrile, cationic hydrophobic monomers and aggregates;

[0011] The aggregate is mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid.

[0012] In this scheme, the drag reducer is calculated by weight: the amphiphilic polymer is calculated by weight: 50-70 parts of acrylamide, 20-40 parts of acrylonitrile, 3-5 parts of cationic hydrophobic monomer, and 5-7 parts of aggregate; in the aggregate, the ratio of 2-acrylamide-2-methylpropanesulfonic acid to mesoporous carbon nanospheres is 1:3-6.

[0013] On the basis of the above scheme, preferably, in the drag reducer, by weight, the following are: 64 parts of acrylamide, 26 parts of acrylonitrile, 4 parts of cationic hydrophobic monomer, and 6 parts of aggregate; in the aggregate, the ratio of 2-acrylamide-2-methylpropanesulfonic acid to mesoporous carbon nanospheres is 1:3.

[0014] In an advantageous development, the cationic hydrophobic monomer is dodecylamidopropyl allyl ammonium bromide, tetradecylamidopropyl allyl ammonium bromide, hexadecylamidopropyl allyl ammonium bromide, or octadecylamidopropyl allyl ammonium bromide.

[0015] Preferably, erucic acid amide propyl ammonium bromide is used as the cationic monomer. After the preparation of erucic acid amide propyl ammonium bromide is completed, mass spectrometry is used to measure the mass spectrum characteristics, such as Figure 1 As shown. Figure 1 As can be seen, the peak at m / z 463.8 is the proton peak of [EDAA-Br]+, indicating that the structure of the synthesized product is consistent with the target product.

[0016] In a favorable expansion scheme, the mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid are prepared by: dissolving 2-acrylamide-2-methylpropanesulfonic acid into a solution, placing the mesoporous carbon nanospheres in the solution, and stirring for 24 hours; separating the precipitate by centrifugal filtration, washing with phosphate buffer, and drying in a vacuum at 30°C.

[0017] (Second aspect)

[0018] The preparation method of the slippery water system based on amphiphilic polymer is characterized in that it comprises the following preparation steps:

[0019] S1, first prepare an amphiphilic polymer;

[0020] S11, taking an appropriate amount of deionized water, adding acrylamide and mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid into the water, and passing nitrogen gas;

[0021] S12, using azobisisobutylamidine hydrochloride as an initiator to initiate a polymerization reaction, maintaining the temperature at 40-45° C. during the polymerization reaction; the polymerization duration is 0.5-1 h;

[0022] S13, further adding acrylonitrile and cationic hydrophobic monomer, adding azobisisobutylamidine hydrochloride as an initiator, and continuing the polymerization reaction for 2 hours;

[0023] S2, take white oil, add organic montmorillonite, mechanically stir at 1000r / min for 30min, then add the amphiphilic polymer prepared in step S1, continue stirring at 800r / min for 20min, to obtain a suspended drag reducing agent;

[0024] S3. Take the suspended drag reducing agent prepared in step S2, add it into a proper amount of water and stir it, then gradually add the clay stabilizer and drainage aid, stir it thoroughly and dissolve it evenly.

[0025] In the above S11, acrylamide first reacts with itself and 2-acrylamide-2-methylpropanesulfonic acid; acrylamide enters the mesoporous carbon nanospheres through the small holes and reacts with part of the 2-acrylamide-2-methylpropanesulfonic acid inside, thereby forming a structure in which the polymer passes through the pores of the mesoporous carbon nanospheres, allowing the polymer to transform from a simple linear structure to an overall spatial network structure with support points.

[0026] In the above S13, acrylamide is also polymerized with acrylonitrile and a hydrophobic monomer. The hydrophobic monomer itself has a high salt resistance effect; the hydrophobic association between the hydrophobic monomers themselves makes different molecular chains attract each other, forming a more complex network structure.

[0027] It should be noted that when the fluid flows in the pipe, as the flow rate increases, the fluid gradually changes from the laminar flow to the vortex state, a large number of violent vortices are generated inside the fluid, and the vortices collide with each other and with the pipe wall, resulting in energy loss, which is manifested as high friction resistance from a macroscopic perspective. If slippery water with a certain viscosity flows at high speed, it is disturbed by polymer molecules, the number of vortices formed is small, and the probability of energy loss due to mutual collision is reduced, which is manifested as reduced friction resistance from a macroscopic perspective.

[0028] However, if the amount of polymer is increased simply to avoid eddies, the presence of a large amount of polymer will affect the laminar flow speed when the flow rate is not high.

[0029] The principles of this solution are:

[0030] a. Taking acrylamide as the basic polymer, a hydrophobic monomer, 2-acrylamide-2-methylpropane sulfonic acid, and a cationic hydrophobic monomer are grafted thereon;

[0031] b. Since 2-acrylamide-2-methylpropanesulfonic acid is extremely easy to polymerize with acrylamide, and since 2-acrylamide-2-methylpropanesulfonic acid is present in mesoporous carbon nanospheres, when the polymerization reaction occurs, multiple polymer molecular chains penetrate into the mesoporous carbon nanospheres; since the mesoporous carbon nanospheres have good dispersibility, they play a role of suspension, dispersion and support on the entire polymer micelle;

[0032] c. Since the cationic hydrophobic monomer has the characteristics of high temperature resistance and salt resistance, it is grafted onto acrylamide, and the final polymerization product also has the characteristics of high temperature resistance and salt resistance;

[0033] When the cationic hydrophobic monomer is grafted, it is very helpful to reduce eddy currents (which is the existing technology), but it is also easy to entangle itself. When the branched chain formed after the grafting is adsorbed on the aggregate to a certain extent, it is fixed to a certain extent, thereby avoiding excessive entanglement; the specific principle is that 2-acrylamide-2-methylpropane sulfonic acid is actually an anionic surfactant. When 2-acrylamide-2-methylpropane sulfonic acid is polymerized with acrylamide to suspend the mesoporous carbon nanospheres, the mesoporous carbon nanospheres will still release some 2-acrylamide-2-methylpropane sulfonic acid. Then, when the cationic hydrophobic monomer is polymerized with acrylamide, the cationic hydrophobic monomer and the 2-acrylamide-2-methylpropane sulfonic acid on the surface of the mesoporous carbon nanospheres produce a certain adsorption, which is equivalent to adsorbing the branched chain of the cationic hydrophobic monomer on the surface of the mesoporous carbon nanospheres, thereby fixing them and avoiding entanglement;

[0034] d. Compared with the traditional use of polymers and then using nanomaterials as dispersion support materials, the mesoporous carbon nanospheres in this scheme are firmly fixed to the polymer molecules through the polymerization reaction of acrylamide and 2-acrylamide-2-methylpropane sulfonic acid inside the mesoporous carbon nanospheres. Compared with the traditional method of combining polymers and nanomaterials through charge adsorption, this method has higher binding strength and stronger binding stability.

[0035] The present invention has the following advantages:

[0036] (1) By setting mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid, acrylamide extends into the mesoporous carbon nanospheres to form polymer molecular chains, and the strength of the mesoporous carbon nanospheres being combined is strengthened; under the excellent suspension and dispersion effect of the mesoporous carbon nanospheres themselves, the entire polymer product has a very excellent suspension and dispersion effect in the aqueous solution, and can form a denser network structure and viscosity. Even if the solution is left for a long time, its performance is not affected;

[0037] (2) By introducing cationic hydrophobic monomers, especially erucic acid amide propyl ammonium bromide, the presence of hydrophobic chains can effectively reduce eddy currents; since cationic hydrophobic monomers will be adsorbed on mesoporous carbon nanospheres with negative ions to a certain extent, cationic hydrophobic monomers are not easy to entangle after grafting, which is conducive to gel breaking;

[0038] (3) Since long-chain cationic surfactants are positive, they can easily adsorb negative soil particles during mining and have good anti-swelling ability;

[0039] (4) Cationic hydrophobic monomers, especially grafted erucic acid amide propyl ammonium bromide, make the entire polymer product exhibit excellent salt resistance and high temperature resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Mass spectrometric characterization of erucamidopropylammonium bromide;

[0041] Figure 2 Comparative Example 1: Electron microscopic image of the network structure formed by the suspended drag reducing agent in the aqueous solution;

[0042] Figure 3 Example 2 Electron microscopic image of the network structure formed by the suspended polymer in the aqueous solution;

[0043] Figure 4 This is the reaction process for the preparation of cationic hydrophobic monomers. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0045] (Example 1)

[0046] Preparation method of temperature-resistant and salt-resistant slippery water based on amphiphilic polymer:

[0047] S1, first prepare an amphiphilic polymer;

[0048] S11, taking an appropriate amount of deionized water, adding 50 parts of acrylamide and 5 parts of mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropane sulfonic acid (1.25 parts of 2-acrylamide-2-methylpropane sulfonic acid and 4.75 parts of open-pore carbon nanospheres) into the water, and passing nitrogen gas;

[0049] S12, using azobisisobutylamidine hydrochloride as an initiator to initiate a polymerization reaction, maintaining the temperature at 40° C. during the polymerization reaction; the polymerization duration is 0.5 h;

[0050] S13, further adding 20 parts of acrylonitrile and 3 parts of hydrophobic monomer, adding azobisisobutylamidine hydrochloride as an initiator, and continuing the polymerization reaction for 2 hours;

[0051] S2. Take white oil, add organic montmorillonite, stir mechanically at 1000 r / min for 30 min, then add the amphiphilic polymer prepared in step S1, continue stirring at 800 r / min for 20 min to obtain a suspended drag reducing agent; amphiphilic polymer: white oil: organic montmorillonite = 40:3:57.

[0052] S3. Take the suspended drag reducing agent prepared in step S2, add an appropriate amount of water and stir, then gradually add clay stabilizer and drainage aid, stir thoroughly and dissolve evenly; suspended drag reducing agent: clay stabilizer: drainage aid: water = 0.05:0.1:0.3:95.55.

[0053] (Example 2)

[0054] Preparation method of temperature-resistant and salt-resistant slippery water based on amphiphilic polymer:

[0055] S1, first prepare an amphiphilic polymer;

[0056] S11, taking an appropriate amount of deionized water, adding 64 parts of acrylamide and 6 parts of mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropane sulfonic acid (1 part of 2-acrylamide-2-methylpropane sulfonic acid and 5 parts of open-pore carbon nanospheres) into the water, and passing nitrogen gas;

[0057] S12, using azobisisobutylamidine hydrochloride as an initiator to initiate a polymerization reaction, maintaining the temperature at 42° C. during the polymerization reaction; the polymerization duration is 0.8 h;

[0058] S13, further adding 30 parts of acrylonitrile and 4 parts of cationic hydrophobic monomer, adding azobisisobutylamidine hydrochloride as an initiator, and continuing the polymerization reaction for 2 hours;

[0059] S2. Take white oil, add organic montmorillonite, stir mechanically at 1000 r / min for 30 min, then add the amphiphilic polymer prepared in step S1, continue stirring at 800 r / min for 20 min to obtain a suspended drag reducing agent; amphiphilic polymer: white oil: organic montmorillonite = 40:3:57.

[0060] S3. Take the suspended drag reducing agent prepared in step S2, add an appropriate amount of water and stir, then gradually add clay stabilizer and drainage aid, stir thoroughly and dissolve evenly; suspended drag reducing agent: clay stabilizer: drainage aid: water = 0.2:0.5:0.8:98.5.

[0061] (Example 3)

[0062] Preparation method of temperature-resistant and salt-resistant slippery water based on amphiphilic polymer:

[0063] S1, first prepare an amphiphilic polymer;

[0064] S11, taking an appropriate amount of deionized water, adding 70 parts of acrylamide and 7 parts of mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropane sulfonic acid (1 part of 2-acrylamide-2-methylpropane sulfonic acid and 6 parts of open-porous carbon nanospheres) into the water, and passing nitrogen gas;

[0065] S12, using azobisisobutylamidine hydrochloride as an initiator to initiate a polymerization reaction, maintaining the temperature at 45° C. during the polymerization reaction; the polymerization duration is 1 hour;

[0066] S13, further adding 40 parts of acrylonitrile and 5 parts of cationic hydrophobic monomer, adding azobisisobutylamidine hydrochloride as an initiator, and continuing the polymerization reaction for 2 hours;

[0067] S2. Take white oil, add organic montmorillonite, stir mechanically at 1000 r / min for 30 min, then add the amphiphilic polymer prepared in step S1, continue stirring at 800 r / min for 20 min to obtain a suspended drag reducing agent; amphiphilic polymer: white oil: organic montmorillonite = 40:3:57.

[0068] S3. Take the suspended drag reducer prepared in step S2, add an appropriate amount of water and stir, then gradually add clay stabilizer and drainage aid, stir thoroughly and dissolve evenly; suspended drag reducer: clay stabilizer: drainage aid: water = 0.5:1.0:1.5:97.

[0069] It should be noted that the cationic hydrophobic monomers used in the above-mentioned Examples 1 to 3 are all erucic acid amide propyl ammonium bromide.

[0070] (Comparative Example 1)

[0071] Compared with Example 2, the difference is that 40 parts of montmorillonite are used instead of mesoporous nanospheres. (60)

[0072] (Comparative Example 2)

[0073] Compared with Example 2, the difference is that no mesoporous carbon nanospheres are added. (30)

[0074] (Comparative Example 3)

[0075] Compared with Example 2, the difference is that a common cationic monomer without a hydrophobic chain (produced by Henan Daochun Chemical Technology Co., Ltd.) is used instead of the cationic hydrophobic monomer of this scheme. (90)

[0076] (Comparative Example 4)

[0077] Compared with Example 2, the difference is that no cationic hydrophobic monomer is added. (75)

[0078] (Test Example 1)

[0079] The skating water prepared in Example 2, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were evaluated, and three groups of samples were selected respectively. The performance test results are shown in Table 1.

[0080] Table 1 Performance test results

[0081]

[0082] From Table 1 we can see that:

[0083] Judging from the apparent viscosity data, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 are all lower than those in Experimental Example 2, which shows that the addition of either mesoporous carbon nanospheres or cationic hydrophobic monomers can help improve the viscosity-enhancing properties of the polymer. This is mainly because the mesoporous carbon nanospheres can serve as physical support points for polymer molecular chains in aqueous solution, while cationic hydrophobic monomers can increase the degree of intermolecular bonding through hydrophobic association, both of which help to increase the cross-linking properties of polymer molecules and thus increase the viscosity of the solution.

[0084] From the perspective of proppant settling rate, Comparative Examples 1 and 2 have poorer sand suspension effects than Experimental Examples 2, 3 and 4, while Comparative Examples 3 and 4 also have poorer sand suspension effects relative to Example 2, indicating that the addition of mesoporous carbon nanospheres and cationic hydrophobic monomers is beneficial to improving the viscoelasticity of the polymer solution, and the mesoporous carbon nanospheres have a more obvious effect. This is mainly because the mesoporous carbon nanospheres form a stable structure with the overall molecule through covalent bonds, while the cationic hydrophobic monomers can only improve the structural stability through weaker non-covalent effects and are more easily destroyed.

[0085] From the drag reduction rate point of view, there is no significant difference between Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 compared to Experimental Example 2. This is mainly because these polymer molecules can form a network structure in water to effectively reduce the turbulence of water, and will not change due to the strength of the network structure. Therefore, the drag reduction rates of different polymers are relatively small.

[0086] (Test Example 2)

[0087] Comparative Example 1: The corresponding suspended drag reducer of Example 2 was placed in water to dissolve in water, and the resulting network structure was shown in the electron microscope image. Figure 2 and Figure 3 shown. Figure 2 This is an electron microscope image of the network structure formed by the suspended floating drag reducing agent in aqueous solution in Comparative Example 1; Figure 3 This is an electron microscope image of the network structure formed in the aqueous solution of the suspended drag reducing agent corresponding to Example 2.

[0088] It can be seen from the figure that: 1. The network structure formed by the suspended drag reducer with mesoporous carbon nanospheres is more dense ( Figure 3 Compare Figure 2 more dense); second, the micelles formed by the suspended drag reducer with mesoporous carbon nanospheres are finer.

[0089] The reasons for this phenomenon are: 1. During the polymerization process, if acrylamide polymerizes with 2-acrylamide-2-methylpropanesulfonic acid at the mesoporous carbon nanospheres (inside, at the pores), multiple micelles will pass through the mesoporous carbon nanospheres (without mesoporous carbon nanospheres). Figure 2 Since the micelles do not need to pass through the mesoporous carbon nanospheres, they only need to adsorb the montmorillonite); second, after the cationic hydrophobic monomer is on the entire polymer, the cationic hydrophobic side chains that were originally in a free state will be adsorbed on the mesoporous carbon nanospheres (the cationic hydrophobic monomer is positive, and the 2-acrylamide-2-methylpropane sulfonic acid at the mesoporous carbon nanospheres is negative, so they are adsorbed); third, since some acrylamide needs to polymerize with 2-acrylamide-2-methylpropane sulfonic acid at the mesoporous carbon nanospheres (inside, at the pore mouth), but the amount of 2-acrylamide-2-methylpropane sulfonic acid at a single pore mouth of the mesoporous carbon nanospheres is small, the polymerized rubber strips formed are relatively thin.

[0090] The benefits of the above phenomenon are:

[0091] 1. Since the pore size distribution of mesoporous carbon nanospheres is adjustable and the volume of the internal cavities is adjustable, if there are some closed cavities inside, mesoporous carbon nanospheres with good suspension effect will be formed (this scheme chooses this type to improve the suspension performance); during polymerization, when multiple micelles pass through the mesoporous carbon nanospheres, the mesoporous carbon nanospheres are equivalent to nodes with good suspension effect on the micelles, and the entire micelle is suspended through these nodes with good suspension effect, so that the entire polymer exhibits good suspension performance;

[0092] 2. Ordinary drag reducers also use hydrophobic cationic monomers to reduce eddy currents (reducing eddy currents can improve the flow effect of slippery water), but after grafting, these hydrophobic cationic side chains themselves are prone to entanglement, which reduces the flow effect to a certain extent (although it can still improve the flow effect overall, the performance has not been developed to the limit); therefore, this scheme introduces mesoporous carbon nanospheres. Since the 2-acrylamide-2-methylpropanesulfonic acid stored in the mesoporous carbon nanospheres is negative, while the hydrophobic cationic side chains are positive, the hydrophobic cationic side chains will be adsorbed on the mesoporous carbon nanospheres to a certain extent to avoid entanglement, thereby maximizing the eddy current blocking effect of the hydrophobic cationic side chains.

[0093] 3. Although the polymer network structure contained in the slippery water can reduce eddy currents and thus improve fluidity during mining, it does not mean that the denser the polymer network structure, the better. When the polymer network structure is very dense, it will not only block eddy currents, but also block the normal flow of the liquid. That is, when it is very dense, it will reduce fluidity. In this solution, Figure 3 It can be seen that the micelles are very thin, so when the flow rate of the liquid reaches a certain level, these network structures can be damaged to a certain extent ( Figure 2Since the micelles are thick, they are not easily destroyed), that is, the density of this solution will not hinder the flow of the liquid (that is, it takes into account the reduction of eddy currents and will not hinder the normal transportation of the liquid).

[0094] The above embodiments only express preferred implementation modes, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. Slippery water based on amphiphilic polymers, characterized in that: It is prepared from the following raw materials by mass: Suspended drag reducer 0.05-0.5wt%, clay stabilizer 0.1-1.0wt%, drainage aid 0.3-1.5wt%, and the balance is water; The suspension drag reducer is prepared from the following raw materials in parts by mass: 40% of amphiphilic polymer, 3% of organic montmorillonite, and the balance of white oil; The amphiphilic polymer is prepared from acrylamide, acrylonitrile, cationic hydrophobic monomers and aggregates; The aggregate is mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid; The amphiphilic polymer comprises 50 to 70 parts by weight of acrylamide, 20 to 40 parts by weight of acrylonitrile, 3 to 5 parts by weight of cationic hydrophobic monomer, and 5 to 7 parts by weight of aggregate; in the aggregate, the ratio of 2-acrylamide-2-methylpropanesulfonic acid to mesoporous carbon nanospheres is 1:3 to 6; The cationic hydrophobic monomer is erucamide propyl ammonium bromide.

2. The amphiphilic polymer-based slippery water according to claim 1, characterized in that: The amphiphilic polymer comprises, by weight: 64 parts of acrylamide, 26 parts of acrylonitrile, 4 parts of cationic hydrophobic monomer, and 6 parts of aggregate; In the aggregate, the ratio of 2-acrylamide-2-methylpropanesulfonic acid to mesoporous carbon nanospheres is 1:

3.

3. The amphiphilic polymer-based slippery water according to claim 1, characterized in that: The mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid are prepared by: After 2-acrylamide-2-methylpropanesulfonic acid was dissolved into a solution, the mesoporous carbon nanospheres were placed in the solution and stirred for 24 hours; The precipitate was separated by centrifugal filtration, washed with phosphate buffer, and dried at 30°C in vacuum.

4. The method for preparing slippery water based on amphiphilic polymer according to claim 1, characterized in that: It comprises the following preparation steps: S1, first prepare an amphiphilic polymer; S11, taking an appropriate amount of deionized water, adding acrylamide and mesoporous carbon nanospheres loaded with 2-acrylamide-2-methylpropanesulfonic acid into the water, and passing nitrogen gas; S12, using azobisisobutylamidine hydrochloride as an initiator to initiate a polymerization reaction, maintaining the temperature at 40-45° C. during the polymerization reaction; the polymerization duration is 0.5-1 h; S13, further adding acrylonitrile and cationic hydrophobic monomer, adding azobisisobutylamidine hydrochloride as an initiator, and continuing the polymerization reaction for 2 hours; S2, take white oil, add organic montmorillonite, mechanically stir at 1000r / min for 30min, then add the amphiphilic polymer prepared in step S1, continue stirring at 800r / min for 20min, to obtain a suspended drag reducing agent; S3, take the suspended drag reducing agent prepared in step S2, add an appropriate amount of water and stir, then gradually add clay stabilizer and drainage agent, stir well and dissolve evenly; The amphiphilic polymer comprises 50 to 70 parts by weight of acrylamide, 20 to 40 parts by weight of acrylonitrile, 3 to 5 parts by weight of cationic hydrophobic monomer, and 5 to 7 parts by weight of aggregate; in the aggregate, the ratio of 2-acrylamide-2-methylpropanesulfonic acid to mesoporous carbon nanospheres is 1:3 to 6; The cationic hydrophobic monomer is erucamide propyl ammonium bromide.

5. The method for preparing slippery water based on amphiphilic polymer according to claim 4, characterized in that: In S11, acrylamide first undergoes polymerization reaction with itself and 2-acrylamide-2-methylpropanesulfonic acid; Acrylamide will enter the mesoporous carbon nanospheres through the small holes and undergo a polymerization reaction with part of the 2-acrylamide-2-methylpropanesulfonic acid inside, thereby forming a structure in which one or more polymer chains pass through the pores of the same mesoporous carbon nanosphere, allowing the polymer to transform from a simple linear structure to an overall spatial network structure with the mesoporous carbon nanospheres as the fulcrum.

6. The method for preparing slippery water based on amphiphilic polymer according to claim 4, characterized in that: In S13, acrylamide is also polymerized with acrylonitrile and a hydrophobic monomer, and the hydrophobic monomer itself has a high salt resistance effect; The hydrophobic association between the hydrophobic monomers themselves makes different molecular chains attract each other, forming a more complex network structure.

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