A kind of polymer slippery water capable of self-generating acid and preparation method thereof

Abstract

The invention discloses a self-acidifying polymer slippery water and a preparation method thereof. The method uses ethylene dichloride as a solvent, concentrated sulfuric acid as a catalyst, and adds hydroxyethyl acrylate and formic acid to obtain an intermediate after reaction; then uses ethanol as a solvent, adds a free radical initiator, and polymerizes the intermediate to obtain poly(2-(formyloxy)ethyl)acrylate. The slippery water is added into water for stirring, and then a clay stabilizer, a drainage agent and water are gradually added to dissolve the slippery water uniformly to obtain a self-acidifying polymer slippery water. The self-acidifying polymer slippery water prepared by the invention can efficiently transport the proppant to the far end of the fracture by adding a small amount, thereby reducing the feeding of the polymer and greatly reducing the cost; poly(2-(formyloxy)ethyl)acrylate is stable at low temperature, and hydrolyzes at a formation temperature of more than 80°C, and the hydrolysis product is formic acid, which realizes the neutrality of the working fluid in the early stage and the acidity in the later stage, avoids the direct contact between the acid solution and the injection well pipe wall, and prevents the pipeline from being corroded by acid.

Description

Technical Field

[0001] The invention belongs to the technical field of slippery water, and in particular relates to a polymer slippery water capable of self-generating acid and a preparation method thereof. Background Art

[0002] Shale gas has been an important area for increasing oil and gas production in recent years. However, due to the low permeability of shale reservoirs, it is difficult to develop. If you want to exploit it on a large scale, volume fracturing transformation is the main means to increase shale gas production. Shale gas fracturing fluid is different from traditional fracturing fluid. It is a low-cost water-based fracturing fluid based on various slippery waters. It forms a complex three-dimensional fracture network in shale reservoirs to achieve efficient development of shale gas. At present, conventional slippery water has the following problems: the conventional "acid + slippery water" combined fracturing mode is easy to cause complex fractures near the wellbore, which is not conducive to the diversion of distal fractures and affects the fracturing effect; the traditional way of adding acid to slippery water is to mix the acid directly with the polymer. This addition method cannot avoid the negative impact of the acid on the polymer, which greatly reduces the viscosity of the polymer solution, not only weakening the fracture-making ability of slippery water, but also increasing the amount of polymer used, increasing economic costs. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a self-acidifying polymer-based slippery water and a preparation method thereof, so as to solve the problems of poor slippery water production ability and large amount of polymer used in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The first aspect of the present invention discloses a method for preparing a self-acidifying polymer-based slippery water, comprising the following steps:

[0006] S1, adding hydroxyethyl acrylate, formic acid and concentrated sulfuric acid into ethylene dichloride, and obtaining 2-(formyloxy)ethyl acrylate after reaction; wherein the molar ratio of hydroxyethyl acrylate to formic acid is (0.91-1.83):5, and the molar ratio of concentrated sulfuric acid to hydroxyethyl acrylate is (1-2):(0.91-1.83);

[0007] S2, adding 2-(formyloxy)ethyl acrylate to ethanol, adding a free radical initiator, and polymerizing 2-(formyloxy)ethyl acrylate under the action of the free radical initiator to generate poly-2-(formyloxy)ethyl acrylate; the mass ratio of ethanol to 2-(formyloxy)ethyl acrylate is (2-3): 1, the mass of the free radical initiator is 0.1wt%-0.2wt% of the mass of 2-(formyloxy)ethyl acrylate;

[0008] S3, mixing poly(2-formyloxy)ethyl acrylate with water and stirring, adding a clay stabilizer and a drainage aid, to obtain a polymer-based slippery water capable of self-generating acid; wherein the mass proportion of poly(2-formyloxy)ethyl acrylate is 1wt%-2wt%, the mass proportion of the clay stabilizer is 0.3wt%-1.0wt%, the mass proportion of the drainage aid is 0.4wt%-0.8wt%, and the balance is water;

[0009] When the polymer slippery water is used, when the ground temperature is greater than 80° C., poly(2-formyloxy)ethyl acrylic acid is hydrolyzed to produce formic acid.

[0010] Preferably, in S1, the reaction temperature is 150° C.-170° C., and the reaction time is 3 h-5 h. Limiting the reaction temperature and reaction time can increase the reactivity of hydroxyethyl acrylate and formic acid, so that hydroxyethyl acrylate and formic acid can fully react.

[0011] Preferably, in S2, the polymerization reaction temperature is 40°C-60°C, and the polymerization reaction time is 10h-24h. The polymerization reaction temperature and time are limited so that during the polymerization reaction, the intermediate 2-(formyloxy)ethyl acrylate is not easily decomposed due to excessive temperature, and can maintain sufficient polymerization activity, thereby facilitating the polymerization reaction.

[0012] Preferably, in S2, the free radical initiator is azobisisobutyronitrile or dibenzoyl peroxide. When azobisisobutyronitrile or dibenzoyl peroxide is used as a free radical initiator, each of them can generate free radicals for catalytic reaction when heated.

[0013] Preferably, in S2, after the polymerization reaction, the polymerization reaction product is concentrated by rotary evaporation to form a polymer, the polymer is precipitated with ether, and vacuum dried to constant weight to obtain poly(2-formyloxy)ethyl acrylate). After the polymerization reaction, the reaction product is concentrated by rotary evaporation and vacuum dried to remove impurities in the product and improve the purity of the product.

[0014] Preferably, in S3, the clay stabilizer is a quaternary ammonium salt type clay stabilizer. The quaternary ammonium salt type clay stabilizer can be effectively adsorbed on the clay surface, thereby playing a stabilizing role and protecting the oil and gas layer.

[0015] Preferably, in S3, the quaternary ammonium salt type clay stabilizer is any one of dodecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride or dodecyldimethyl (3-sulfopropyl) ammonium hydroxide inner salt.

[0016] Preferably, in S3, the drainage aid is one of ethanol, butanol, nonylphenol polyoxyethylene ether or dodecanol polyoxyethylene ether. The use of the drainage aid helps to make the fracturing fluid more easily discharged from the formation after the fracturing construction.

[0017] A self-acidifying polymer slippery water prepared by any one of the above preparation methods, comprising, by mass fraction, 1wt%-2wt% of poly(2-formyloxy)ethyl acrylate, 0.3wt%-1.0wt% of a clay stabilizer, 0.4wt%-0.8wt% of a drainage aid, and the balance being water;

[0018] When the self-acid-generating polymer slippery water is used, when the ground temperature is greater than 80° C., poly(2-formyloxy)ethyl acrylic acid is hydrolyzed to generate formic acid.

[0019] The invention discloses a method for preparing a polymer-based slippery water capable of self-generating acid. The method uses ethylene dichloride as a solvent and concentrated sulfuric acid as a catalyst, and adds hydroxyethyl acrylate and formic acid to react to obtain an intermediate. Then, ethanol is used as a solvent, a free radical initiator is added, and a free radical polymerization reaction is performed to obtain poly(2-formyloxy)ethyl acrylate). The intermediate is added into water and stirred, and then a clay stabilizer, a drainage aid and water are gradually added to dissolve the mixture uniformly to obtain a polymer-based slippery water capable of self-generating acid. The self-acidifying polymer slick water prepared by the present invention is a water-soluble high molecular polymer, wherein the poly(2-(formyloxy)ethyl)acrylate is stable at low temperature and is easily hydrolyzed when the formation temperature is above 80°C, and the hydrolysis product is formic acid, thereby achieving the initial neutrality and the later acidity of the working fluid, avoiding direct contact between the acid fluid and the injection well pipe wall, preventing the pipe from being corroded by acid, and efficiently transporting the proppant to the far end of the fracture with a relatively small addition amount (1wt%-2wt%), reducing the polymer feed and greatly reducing the cost.

[0020] The present invention also discloses a self-generating acid polymer-based slippery water, wherein polyacrylic acid-2-(formyloxy)ethyl ester is stable at low temperatures and easily hydrolyzed at formation temperatures above 80°C, and the hydrolysis product is formic acid, which achieves a neutral environment in the initial stage of the working fluid and ensures acidic conditions in the later stage. This self-generated acid avoids the negative impact of acid on the polymer, and a small amount of addition can efficiently transport the proppant to the far end of the fracture, reducing the polymer feed and greatly reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a hydrogen NMR spectrum test chart of poly(2-formyloxy)ethyl acrylate) prepared in Example 1 of the present invention;

[0022] Figure 2 This is a graph showing the change in solubility of the slippery water prepared in Example 1 of the present invention over time;

[0023] Figure 3 The effect of temperature on the viscosity of the slippery water prepared in the examples of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0025] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0026] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0027] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0028] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0029] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0030] The present invention discloses a method for preparing polymer slippery water capable of self-generating acid, comprising the following steps:

[0031] S1, add dichloroethane as solvent to a three-necked flask, add reactants, the reactants are hydroxyethyl acrylate and formic acid, the molar ratio of hydroxyethyl acrylate to formic acid is (0.91-1.83):5, add concentrated sulfuric acid as a catalyst, react at 150℃-170℃ for 3h-5h, and obtain the intermediate 2-(formyloxy)ethyl acrylate. The mass ratio of the mass of dichloroethane to the sum of the mass of the reactants is (2-3):1, the molar ratio of concentrated sulfuric acid to hydroxyethyl acrylate is (1-2): (0.91-1.83), and the reaction formula is as follows:

[0032]

[0033] S2, add ethanol as solvent to the intermediate, add free radical initiator, and carry out free radical polymerization reaction at a temperature of 40℃-60℃ for 10h-24h, wherein the mass ratio of ethanol to intermediate is (2-3):1, and the mass of free radical initiator is 0.1wt%-0.2wt% of the mass of intermediate. After the polymerization is completed, poly(2-(formyloxy)ethyl)acrylate is obtained, which is concentrated by rotary evaporation to form a polymer, and the polymer is precipitated with ether, and vacuum dried at room temperature to constant weight to obtain an off-white solid. The reaction formula is as follows:

[0034]

[0035] Wherein, n is the degree of polymerization, the value range of n is 50~100, and the above-mentioned Initiator is a polymerization reaction.

[0036] In the above process, hydroxyethyl acrylate and formic acid first react under the action of sulfuric acid to form 2-(formyloxy)ethyl acrylate, and 2-(formyloxy)ethyl acrylate is then polymerized to form poly-2-(formyloxy)ethyl acrylate.

[0037] In S2, the free radical initiator is azobisisobutyronitrile or dibenzoyl peroxide.

[0038] S3: Add poly(2-formyloxy)ethyl acrylate) into water and stir, then gradually add clay stabilizer and drainage aid, dissolve evenly to obtain a self-acidifying polymer slippery water.

[0039] In terms of mass fraction, the mass proportion of poly(2-formyloxy)ethyl acrylate) in the polymer slippery water is 1wt%-2wt%, the mass proportion of the clay stabilizer is 0.3wt%-1.0wt%, the mass proportion of the drainage agent is 0.4wt%-0.8wt%, and the balance is water.

[0040] The clay stabilizer is a quaternary ammonium salt type clay stabilizer, specifically one of dodecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride or dodecyldimethyl (3-sulfopropyl) ammonium hydroxide inner salt.

[0041] The drainage aid is one of ethanol, butanol, nonylphenol polyoxyethylene ether or dodecanol polyoxyethylene ether.

[0042] The second aspect of the present invention discloses a self-acidifying polymer slippery water, which contains, by mass fraction, 1wt%-2wt% of poly(2-formyloxy)ethyl acrylate, 0.3wt%-1.0wt% of a clay stabilizer, 0.4wt%-0.8wt% of a drainage aid, and the remainder is water.

[0043] When the self-acidifying polymer slippery water is used, acid is generated by hydrolysis of the polymer, and the hydrolysis reaction is as follows:

[0044]

[0045] Among them, n is the degree of polymerization, and the value range of n is 50~100.

[0046] In the above process, the self-acidifying polymer slick water prepared by the present invention is a water-soluble high molecular polymer, in which poly(2-(formyloxy)ethyl acrylic acid) is stable at low temperatures and is easily hydrolyzed at formation temperatures above 80°C. The hydrolysis product is formic acid, which achieves the initial neutrality of the working fluid and the acidity in the later stage, avoids direct contact between the acid and the injection well pipe wall, and prevents the pipe from being corroded by acid.

[0047] The following is further described in conjunction with specific embodiments.

[0048] Example 1

[0049] Add dichloroethane (672g, 6.79mol), hydroxyethyl acrylate (106g, 0.91mol) and formic acid (230g, 5mol) to a three-necked flask, add concentrated sulfuric acid (98g, 1mol) as a catalyst, react at 150°C for 3h to obtain the intermediate 2-(formyloxy)ethyl acrylate. Add ethanol (288g) as a solvent to the intermediate (144g), add azobisisobutyronitrile (0.144g) as a free radical initiator, and perform free radical polymerization at 40°C for 10h. After the polymerization is completed, poly(2-(formyloxy)ethyl acrylate) is obtained, which is concentrated by rotary evaporation, and the polymer is precipitated with ether. It is vacuum dried at room temperature to constant weight to obtain an off-white solid. Poly(2-formyloxy)ethyl acrylic acid (1 g) was added to water (98.3 g) and stirred, and then dodecyltrimethylammonium chloride (0.3 g) and ethanol (0.4 g) were gradually added and dissolved uniformly to obtain a self-acidifying polymer-type slippery water.

[0050] Example 2

[0051] Add dichloroethane (1326g, 13.4mol), hydroxyethyl acrylate (212g, 1.83mol) and formic acid (230g, 5mol) to a three-necked flask, add concentrated sulfuric acid (196g, 2mol) as a catalyst, react at 170°C for 5h to obtain the intermediate 2-(formyloxy)ethyl acrylate. Add ethanol (432g) as a solvent to the intermediate (144g), add azobisisobutyronitrile (0.288g) as a free radical initiator, and perform free radical polymerization at 60°C for 24h. After the polymerization is completed, poly(2-(formyloxy)ethyl acrylate) is obtained, which is concentrated by rotary evaporation, and the polymer is precipitated with ether. It is vacuum dried at room temperature to constant weight to obtain an off-white solid. Poly(2-formyloxy)ethyl acrylic acid (2 g) was added to water (96.2 g) and stirred, and then dodecyldimethylbenzyl ammonium chloride (1 g) and nonylphenol polyoxyethylene ether (0.8 g) were gradually added and dissolved uniformly to obtain a self-acidifying polymer slippery water.

[0052] Example 3

[0053] Add dichloroethane (800g, 8.08mol), hydroxyethyl acrylate (150g, 1.29mol) and formic acid (230g, 5mol) to a three-necked flask, add concentrated sulfuric acid (130g, 1.33mol) as a catalyst, react at 160°C for 4h to obtain the intermediate 2-(formyloxy)ethyl acrylate. Add ethanol (350g) as a solvent to the intermediate (144g), add azobisisobutyronitrile (0.2g) as a free radical initiator, and perform free radical polymerization at 50°C for 15h. After the polymerization is completed, poly(2-(formyloxy)ethyl acrylate) is obtained, which is concentrated by rotary evaporation, and the polymer is precipitated with ether. It is vacuum dried at room temperature to constant weight to obtain an off-white solid. Add polyacrylic acid-2-(formyloxy)ethyl ester (1.5 g) into water (98.3 g) and stir, then gradually add dodecyldimethyl (3-sulfopropyl) ammonium hydroxide inner salt (0.5 g) and dodecanol polyoxyethylene ether (0.6 g) and dissolve evenly to obtain a self-acidifying polymer slippery water.

[0054] Example 4

[0055] Add dichloroethane (860g, 8.69mol), hydroxyethyl acrylate (200g, 1.72mol) and formic acid (230g, 5mol) to a three-necked flask, add concentrated sulfuric acid (150g, 1.53mol) as a catalyst, react at 160°C for 4h to obtain the intermediate 2-(formyloxy)ethyl acrylate. Add ethanol (288g) as a solvent to the intermediate (144g), add dibenzoyl peroxide (0.144g) as a free radical initiator, and perform free radical polymerization at 40°C for 10h. After the polymerization is completed, poly(2-(formyloxy)ethyl acrylate) is obtained, which is concentrated by rotary evaporation, and the polymer is precipitated with ether. It is vacuum dried at room temperature to constant weight to obtain an off-white solid. Poly(2-formyloxy)ethyl acrylic acid (1 g) was added to water (98.3 g) and stirred, and then dodecyltrimethylammonium chloride (0.3 g) and butanol (0.4 g) were gradually added and dissolved uniformly to obtain a self-acidifying polymer-type slippery water.

[0056] See also Figure 1 This is a nuclear magnetic resonance hydrogen spectrum test chart of poly(2-(formyloxy)ethyl)acrylate prepared in Example 1, where fp represents fluorescence intensity. The test results are as follows:

[0057] 1 H NMR (300MHz, CCl3D): δ = 8.10ppm, 4.38ppm, 2.93ppm, 2.58ppm. Among them, the chemical shift of carboxyl (-COOH) is at 8.10ppm at a, the chemical shift of methoxy (-O-CH2-) is at 4.38ppm at b, the chemical shift of -CH2- is at 2.93ppm at c, and the chemical shift of -CH3 is at 2.58ppm at d.

[0058] It can be seen from the NMR data that poly(2-formyloxy)ethyl acrylate) with the target structure was successfully prepared in Example 1.

[0059] The complex construction environment on site requires that the slippery water has excellent solubility to meet the construction requirements of continuous mixing. The better the solubility of the slippery water, the more conducive it is to improving the efficiency of on-site liquid preparation. The slippery water prepared in Example 1 was tested for solubility. The performance test results are as follows: Figure 2 As shown, from Figure 2It can be seen that at 40s, the polymer has an apparent viscosity of 25 mPa·s at a mass concentration of 0.1 wt%, and is completely dissolved in water, showing good solubility. The same solubility test was performed on Examples 2 to 4. The apparent viscosity of the slippery water in Example 2 was 20 mPa·s, the apparent viscosity of the slippery water in Example 3 was 23 mPa·s, and the apparent viscosity of the slippery water in Example 4 was 26 mPa·s.

[0060] Rheological property test: The polyacrylic acid-2-(formyloxy)ethyl ester prepared in Example 1 was prepared into a 1wt% slick water solution, and its heat resistance was tested using a HAKKEMars40 rotational rheometer, which is a rotational rheometer produced by the HAAKE brand of Thermo Fisher Scientific in Germany. During the test, the heating rate was 0.05℃ / s and the shear rate was 170s -1 , the temperature rise range is 30℃-180℃. Figure 3 As the temperature continues to rise, the viscosity of slippery water tends to decrease. This is because the polymer molecular side chains are prone to break when the temperature rises, which is manifested as a decrease in apparent viscosity. However, when the temperature is 90°C, its viscosity is 130 mPa·S, indicating that although acid is generated at this temperature, its effect on the polymer viscosity is minimal.

[0061] Suspended sand performance test: During the construction process, when the high-pressure pump on the ground increases to a certain value, cracks will be generated in the formation. In order to prevent the closure of the cracks and affect the fracturing effect, the injection of sand-carrying fluid supports the cracks to extend forward and promote the flow conductivity. Suspended sand performance is one of the important indicators for evaluating the performance of slick water. A static suspended sand experiment was used to examine the suspended sand performance of the polymer prepared in the embodiment. The proppant used 40 mesh sand. The test results are shown in Table 1. The sedimentation of the sand was observed and it was found that the sedimentation rate was very slow, indicating that the slick water has good suspended sand performance.

[0062] Table 1 Suspended sand performance test results

[0063]

[0064] In summary, the self-acidifying polymer slick water of the present invention can efficiently transport the proppant to the far end of the fracture with a small amount of addition, reducing the polymer feed and greatly reducing the cost; it has a strong sand-carrying and fracture-forming ability, and can achieve efficient shale gas exploitation; polyacrylic acid-2-(formyloxy)ethyl ester is stable at low temperatures and easily hydrolyzed under the action of formation temperature, and the hydrolysis product is formic acid. The neutrality of the working fluid in the early stage and the acidity in the later stage are achieved, and the direct contact between the acid and the injection well pipe wall is avoided, and the pipe is prevented from being corroded by acid.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a self-acidifying polymer-based slippery water, characterized in that: The following steps are involved: S1, adding hydroxyethyl acrylate, formic acid and concentrated sulfuric acid into ethylene dichloride, and obtaining 2-(formyloxy)ethyl acrylate after reaction; wherein the molar ratio of hydroxyethyl acrylate to formic acid is (0.91-1.83):5, and the molar ratio of concentrated sulfuric acid to hydroxyethyl acrylate is (1-2):(0.91-1.83); the reaction temperature is 150°C-170°C, and the reaction time is 3h-5h; S2, adding 2-(formyloxy)ethyl acrylate to ethanol, adding a free radical initiator, and polymerizing 2-(formyloxy)ethyl acrylate under the action of the free radical initiator to generate poly-2-(formyloxy)ethyl acrylate; the mass ratio of ethanol to 2-(formyloxy)ethyl acrylate is (2-3): 1, the mass of the free radical initiator is 0.1wt%-0.2wt% of the mass of 2-(formyloxy)ethyl acrylate; the polymerization reaction temperature is 40°C-60°C, and the polymerization reaction time is 10h-24h; S3, mixing poly(2-formyloxy)ethyl acrylate) with water and stirring, adding a clay stabilizer and a drainage aid to obtain a polymer slippery water that can generate self-acid; wherein the mass proportion of poly(2-formyloxy)ethyl acrylate is 1wt%-2wt%, the mass proportion of the clay stabilizer is 0.3wt%-1.0wt%, the mass proportion of the drainage aid is 0.4wt%-0.8wt%, and the balance is water.

2. The method for preparing a self-acidifying polymer-based slippery water according to claim 1, characterized in that: In S2, the free radical initiator is azobisisobutyronitrile or dibenzoyl peroxide.

3. The method for preparing a self-acidifying polymer-based slippery water according to claim 1, characterized in that: In S2, after the polymerization reaction, the polymerization reaction product is concentrated by rotary evaporation to form a polymer, and the polymer is precipitated by using diethyl ether. After vacuum drying to constant weight, poly(2-formyloxy)ethyl acrylate) is obtained.

4. The method for preparing a self-acidifying polymer-based slippery water according to claim 1, characterized in that: In S3, the clay stabilizer is a quaternary ammonium salt type clay stabilizer.

5. The method for preparing a self-acidifying polymer-based slippery water according to claim 4, characterized in that: In S3, the quaternary ammonium salt type clay stabilizer is any one of dodecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride or dodecyldimethyl (3-sulfopropyl) ammonium hydroxide inner salt.

6. The method for preparing a self-acidifying polymer-based slippery water according to claim 1, characterized in that: In S3, the drainage aid is one of ethanol, butanol, nonylphenol polyoxyethylene ether or dodecanol polyoxyethylene ether.

7. A self-acidifying polymer slippery water prepared by the preparation method according to any one of claims 1 to 6, characterized in that: Calculated by mass fraction, it includes 1wt%-2wt% of poly(2-formyloxy)ethyl acrylate), 0.3wt%-1.0wt% of clay stabilizer, 0.4wt%-0.8wt% of drainage aid, and the balance is water.

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