Amphiphobic nanoparticle, preparation method and application

Abstract

The present application relates to the technical field of drilling fluid, in particular to a kind of amphiphobic nanoparticle, preparation method and application.The present application proposes a kind of preparation method of amphiphobic nanoparticle, including the following steps: including the following steps: step S1: nanoparticle precursor, amino compound is added to solvent I to obtain aqueous solution;Step S2: fluorine-containing compound is added to solvent II to obtain oil phase solution;Step S3: aqueous solution and oil phase solution are mixed to obtain mixed solution I, oxidizing agent, accelerator are added to mixed solution I, stirring, washing, drying to obtain amphiphobic nanoparticle.The preparation method provided by the present application realizes particle surface fluorination using interface reaction, fluorine-containing component can be more enriched on particle surface, fluorine-containing compound utilization is high, and the reaction can be carried out at room temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling fluids, in particular to a kind of double-sol nanoparticle, preparation method and application. BACKGROUND

[0002] Tight oil and gas reservoirs have high shale content, are prone to hydration and dispersion, causing pore throat blockage, and have poor lithology cementation and loose cementation between rock particles, which are easy to break. In addition, tight oil and gas reservoirs are prone to water lock damage, and reservoir damage is diverse, so single and commonly used reservoir protection technology has limited effect on the reservoir.

[0003] The addition of hydrophobic and oleophobic double-sol agents to drilling fluids can significantly reduce the surface energy of the well wall, change the wettability of the rock surface from hydrophilic and oleophilic to hydrophobic and oleophobic, thereby reducing the entry of external liquid phase into the reservoir, and inhibiting the hydration, dispersion and expansion of well wall rock, improving the stability of the well wall. The double-sol reservoir protection technology system can maintain the stability of the well wall from the aspects of "plugging", "filtration loss reduction" and "hydrophobic and oleophobic", which can effectively eliminate liquid lock, reduce or avoid the damage of liquid phase to the reservoir, and improve the development benefit of tight oil and gas reservoirs.

[0004] At present, the double-sol agents added to water-based or oil-based drilling fluids to maintain the stability of the well wall mainly include double-sol silicon dioxide micro-nanoparticles, styrene and methacrylate polymer nanoparticles, and carbon nanotubes (CNT). The main methods for preparing double-sol agents are: reaction with fluorine-containing compounds in solution or emulsion. For example, patent application CN114149796A (a double-sol fluorine-containing nanofluid and its preparation method and application) discloses a double-sol fluorine-containing nanofluid that can change the wettability of hydrophilic and oleophilic reservoirs to double-sol. The double-sol nanofluid has a silicon dioxide particle core and a fluorine-containing polymer shell. The core silicon dioxide particle is modified with a double-bond coupling agent, and then reacted with a fluorine-containing monomer through 80℃ emulsion polymerization to form a double-sol shell. Patent application CN111499792B (double-sol nanoscale plugging agent for oil-based drilling fluid and its preparation method and application) provides a double-sol nanoscale plugging agent for oil-based drilling fluid and its preparation method. The double-sol nanoparticles are obtained by stepwise emulsion polymerization of long-chain alkyl esters such as styrene and isooctyl acrylate, and organic fluorine-containing monomers such as hexafluorobutyl acrylate and dodecafluoroheptyl methacrylate at 75-85℃. Patent applications CN114350332A (biomimetic and double-sol high-efficiency water-based drilling fluid) and CN113698796B (ultra-double-sol agent for high-temperature resistant water-based drilling fluid) disclose a carbon nanotube double-sol agent. The double-sol agent is first modified with a double-bond containing silane coupling agent, and then reacted with perfluorosulfonyl halide in solution at 50-100℃ to obtain the double-sol agent.

[0005] In the preparation method of the amphiphobic agent in the prior art, the dissolution of the fluorine-containing compound in the solution, the reaction and combination efficiency of the fluorine-containing compound with the base silica particles, polymer particles and carbon nanotubes are not considered, and generally, the reaction needs to be carried out at a high temperature. SUMMARY

[0006] In order to solve the above problems in the prior art, the present application provides an amphiphobic nanoparticle, a preparation method and an application.

[0007] In a first aspect, the present application provides a preparation method of an amphiphobic nanoparticle, comprising the following steps:

[0008] Step S1: adding a nanoparticle precursor and an amino-containing compound into a solvent I to obtain an aqueous solution;

[0009] Step S2: adding a fluorine-containing compound into a solvent II to obtain an oil phase solution;

[0010] Step S3: mixing the aqueous solution and the oil phase solution to obtain a mixed solution I, adding an oxidizing agent and a promoting agent into the mixed solution I, stirring, washing and drying to obtain the amphiphobic nanoparticle.

[0011] As a specific embodiment of the present application, the volume ratio of the oil phase solution to the aqueous solution is 3:1-1:3.

[0012] As a specific embodiment of the present application, the solvent II is one or more of n-hexane, cyclohexane and heptane.

[0013] As a specific embodiment of the present application, the fluorine-containing compound is one or more of perfluorooctyl ethoxy silane, tridecafluoroheptyl oxirane and nonafluoropentyl oxirane.

[0014] As a specific embodiment of the present application, the concentration of the fluorine-containing compound in the oil phase solution is 0.01-0.06 mol / L.

[0015] As a specific embodiment of the present application, the amino-containing compound is one of triethylenetetramine, tetraethylenepentamine and aminopropyl triethoxysilane; the concentration of the amino-containing compound in the aqueous solution is 0.02-0.12 mol / L.

[0016] As a specific embodiment of the present application, the stirring rate is 5000-8000 rpm.

[0017] As a specific embodiment of the present application, the oxidizing agent includes sodium periodate or ammonium persulfate; the concentration of the oxidizing agent in the aqueous solution is 0.003-0.006 g / mL. The calculation method of the concentration of the oxidizing agent in the aqueous solution is the ratio of the mass of the oxidizing agent to the volume of the solvent I.

[0018] As a specific embodiment of the present application, the promoter is triethylamine or 1,8-diazabicyclo[5.4.0]undec-7-ene, and the concentration of the promoter in the aqueous solution is 0.1-0.3 mg / mL. The calculation method of the concentration of the promoter in the aqueous solution is the ratio of the mass of the promoter to the volume of the solvent I.

[0019] As a specific embodiment of the present application, the nanoparticle precursor is a polyphenol compound; the solvent I is an acid-base buffer solution I;

[0020] The polyphenol compound is tannic acid or catechol.

[0021] Preferably, the concentration of the polyphenol compound in the aqueous solution is 0.02-0.08 mol / L.

[0022] Preferably, the acid-base buffer solution is a Tris-HCl buffer solution, and the pH value of the acid-base buffer solution is 6.5-8.5.

[0023] As a specific embodiment of the present application, the nanoparticle precursor is a silica nanoparticle, and the solvent I comprises an acid-base buffer solution II and ethanol, and the volume ratio of the acid-base buffer solution to the ethanol in the solvent I is 1:1-3.

[0024] The silica nanoparticle is an amino-containing silica nanoparticle or an epoxy group-containing silica nanoparticle.

[0025] Preferably, the concentration of the silica nanoparticle in the aqueous solution is 0.2-0.5 g / mL.

[0026] Preferably, the acid-base buffer solution II is a Tris-HCl buffer solution, and the pH value of the acid-base buffer solution II is 6.5-8.5.

[0027] The second application provides a dual-repellent nanoparticle, which is a fluorine-containing polyphenol nanoparticle and is prepared by the preparation method provided in the first aspect of the present application.

[0028] The polyphenol compound is oxidized to form a quinone structure in the aqueous solution under the pH value environment defined in the present application and the action of the oxidant, and then reacts with an amino-containing compound to form a Michael addition or Schiff base, and the reactants are stacked, self-assembled and deposited through π-π interaction to form the nanoparticle.

[0029] Meanwhile, the fluorine-containing silane coupling agent is hydrolyzed at the water-oil interface and reacts with the -NH- functional groups on the surface of the polyphenol nanoparticle to load the fluorine-containing groups on the surface of the nanoparticle, so that the surface dual-repellent property is obtained. The reaction schematic diagram is shown in Figure 2 .

[0030] Preferably, the fluorine-containing polyphenol nanoparticle has a particle size of 50-210 nm.

[0031] In a third aspect, the present application provides a dual-repellent nanoparticle, which is a fluorine-containing silica nanoparticle prepared by the method provided in the first aspect of the present application.

[0032] The silica nanoparticle with surface amino or epoxy functional groups reacts with an amino-containing compound and a fluorine-containing compound at the water-oil interface to hydrolyze and condense, thereby loading the fluorine-containing functional groups on the surface of the particle to obtain the dual-repellent property. Figure 3

[0033] Preferably, the fluorine-containing silica nanoparticle has a particle size of 20-50 nm.

[0034] In a fourth aspect, the present application provides an application of the dual-repellent nanoparticle provided in the second aspect or the third aspect of the present application in a drilling fluid.

[0035] In a fifth aspect, the present application provides a drilling fluid, which comprises a base slurry and the dual-repellent nanoparticle provided in the second aspect or the third aspect of the present application, and the content of the dual-repellent nanoparticle in the base slurry is 3 wt%; the filtration loss of the drilling fluid is reduced by 30%-45% compared with that of the base slurry under the conditions of 120℃ and 3.5 MPa pressure difference.

[0036] Compared with the prior art, the present application has the following beneficial effects.

[0037] The preparation method of the dual-repellent nanoparticle provided in the present application realizes fluorination on the surface of the particle by using an interface reaction, the fluorine-containing component can be more enriched on the surface of the particle, the utilization rate of the fluorine-containing compound is high, and the reaction can be carried out at room temperature. The dual-repellent nanoparticle can improve the water-oil wettability of a core surface, the linear expansion rate of bentonite, and the shale hot rolling recovery rate. After the core is immersed in a water dispersion liquid containing 3 wt% of the dual-repellent nanoparticle for 2-4 h and then taken out, the water contact angle of the core surface is 150-162°, and the oil contact angle is 130-150°; after 3 wt% of the dual-repellent nanoparticle water dispersion liquid is added to a bentonite column, the relative linear expansion rate of the bentonite is tested to be 9%-15% after 24 h; after 3 wt% of the dual-repellent nanoparticle water dispersion liquid is added to rock debris, the shale hot rolling recovery rate is tested to be 81%-96%; and when the dual-repellent nanoparticle prepared in the present application is applied in a drilling fluid, the following performance can be achieved: after 3 wt% of the dual-repellent nanoparticle is added to a base slurry of the drilling fluid, the filtration loss of the base slurry after the addition of the dual-repellent nanoparticle is reduced by 30%-45% compared with that of the base slurry under the conditions of 120℃ and 3.5 MPa pressure difference.

[0038] The test methods used in the present application are as follows:

[0039] ​Wettability test method: 3wt% of the amphiphobic nanoparticles were dispersed in water by ultrasonic dispersion to form a dispersion liquid, and the core was immersed in the 3wt% amphiphobic nanoparticle dispersion liquid for 2h and then taken out and dried. 10μl of water droplets or hexadecane oil droplets were dropped on the surface of the dried core slice by using a microsyringe, and the contact angle of the water droplets or oil droplets was measured by using a contact angle measuring instrument. The contact angles at 5 positions were measured and the average value was calculated to evaluate the wettability of the core surface.

[0040] Bentonite swelling test method: 10g of bentonite was dried at 105℃ for 24h, and two bentonite columns were pressed under 4MPa for 5min for each test. The initial height of the bentonite column was measured. The bentonite column was placed on a linear dilatometer (NP-03 type), and 3wt% of the amphiphobic particle water dispersion was added. The swelling height of the bentonite column was measured for 24h, and the relative linear swelling rate was determined.

[0041]

[0042] Wherein, h0 is the initial sample height, and h1 is the sample height after soaking for 24h.

[0043] Debris heat roll recovery rate test method: 20g of debris with a particle size of 6-10mesh (1.7-3.35mm) was added to 3wt% of the amphiphobic nanoparticle water dispersion, and aged at 100℃ for 16h. The debris was washed with water, sieved through a sieve with a pore size of 0.45mm, dried at 105℃ for 4h, and weighed to calculate the recovery rate of the debris.

[0044]

[0045] Wherein, m0 is the mass of the debris before the heat roll, and m1 is the mass of the recovered debris after the heat roll.

[0046] Drilling fluid rheological property test method: a drilling fluid base slurry was prepared, and the composition of the base slurry was as follows: 20g of bentonite was dispersed in 500mL of water to obtain a soil slurry after hydration for 24h. 0.3% of sodium hydroxide, 0.2% of sulfonate copolymer (DSP-2), 0.2% of polyanionic cellulose (LV-PAC), 2% of sulfonated phenolic resin (SMP-2), 3% of anti-sloughing and filtration reducer (KFT), and 3% of sulfonated asphalt powder (FT-1) were added to the soil slurry to obtain a drilling fluid base slurry. 3wt% of the amphiphobic nanoparticles were added to the base slurry, and the viscosity of the drilling fluid was measured by using a six-speed rotational viscometer to calculate the rheological parameters of the drilling fluid.

[0047] Apparent viscosity:

[0048] Plastic viscosity: PV = θ 600 -θ 300 , mPa.s

[0049] Dynamic shear force:

[0050] Where θ 600 , θ 300 are the readings of the six-speed viscometer at 600 r / min and 300 r / min, respectively.

[0051] High temperature and high pressure filtration loss determination method:

[0052] The high temperature and high pressure filtration instrument GGS-71B is used to determine according to the national standard GB / T16783.1-2014.

[0053] High temperature and high pressure filtration loss: FL HTHP = 2 x FL GGS , mL, the pressure difference is 3.5 MPa, and the temperature is 120℃. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 Preparation of dual-repellent micro-nanoparticles by polyphenol or silica particle interface fluorination reaction;

[0055] Figure 2 Preparation of dual-repellent micro-nanoparticles by polyphenol interface fluorination reaction mechanism schematic diagram;

[0056] Figure 3 Preparation of dual-repellent micro-nanoparticles by silica particle interface fluorination reaction mechanism schematic diagram. DETAILED DESCRIPTION

[0057] The application will be further described below in conjunction with specific examples, but does not constitute any limitation on the application.

[0058] Example 1

[0059] Tannic acid and aminopropyl triethoxysilane were dissolved in a Tris-HCl buffer solution (pH = 6.5) to obtain an aqueous phase solution, the concentration of tannic acid in the aqueous phase solution was 0.02 mol / L, and the concentration of aminopropyl triethoxysilane in the aqueous phase solution was 0.02 mol / L;

[0060] Tridecafluoroheptyl oxirane was dissolved in cyclohexane to obtain an oil phase solution, and the concentration of tridecafluoroheptyl oxirane in the oil phase solution was 0.01 mol / L;

[0061] The aqueous phase solution and the oil phase solution are mixed to obtain a mixed solution, the volume ratio of the oil phase solution to the aqueous phase solution is 3:1, stirring is started, the rotating speed is 8000 rpm, sodium periodate and triethylamine are added into the mixed solution, stirring is carried out at room temperature for 2 h, filtration, washing and drying are carried out, and then fluorine-containing polyphenol nanoparticles are obtained. The concentration of sodium periodate in the aqueous phase solution is 0.003 g / mL, and the concentration of triethylamine in the aqueous phase solution is 0.1 mg / mL. The particle size of the obtained fluorine-containing polyphenol nanoparticles is 50-70 nm observed and analyzed by SEM.

[0062] Example 2

[0063] Tannic acid and aminopropyltriethoxysilane are dissolved in a Tris-HCl buffer solution (pH = 7.5) to obtain an aqueous phase solution, the concentration of tannic acid in the aqueous phase solution is 0.04 mol / L, and the concentration of tetraethylenepentamine in the aqueous phase solution is 0.06 mol / L.

[0064] Nonafluoropentylethylene oxide is dissolved in heptane to obtain an oil phase solution, the concentration of nonafluoropentylethylene oxide in the oil phase solution is 0.02 mol / L.

[0065] The aqueous phase solution and the oil phase solution are mixed to obtain a mixed solution, the volume ratio of the oil phase solution to the aqueous phase solution is 1:3, stirring is started, the rotating speed is 8000 rpm, sodium periodate and triethylamine are added into the mixed solution, stirring is carried out at room temperature for 2 h, filtration, washing and drying are carried out, and then fluorine-containing polyphenol nanoparticles are obtained. The concentration of sodium periodate in the aqueous phase solution is 0.004 g / mL, and the concentration of triethylamine in the aqueous phase solution is 0.2 mg / mL. The particle size of the obtained polyphenol nanoparticles is 120-150 nm observed and analyzed by SEM.

[0066] Example 3

[0067] Catechol and triethylenetetramine are dissolved in a Tris-HCl buffer solution (pH = 8.5) to obtain an aqueous phase solution, the concentration of catechol in the aqueous phase solution is 0.08 mol / L, and the concentration of triethylenetetramine in the aqueous phase solution is 0.12 mol / L.

[0068] Perfluorooctylethoxysilane is dissolved in n-hexane to obtain an oil phase solution, the concentration of perfluorooctylethoxysilane in the oil phase solution is 0.04 mol / L.

[0069] The aqueous phase solution and the oil phase solution were mixed to obtain a mixed solution, the volume ratio of the oil phase solution to the aqueous phase solution was 1:1, stirring was started, the rotating speed was 5000 rpm, ammonium persulfate and 1,8-diazabicyclo[5.4.0]undec-7-ene were added to the mixed solution, the solution was stirred at room temperature for 2 h, and then filtration, washing and drying were performed to obtain fluorine-containing polyphenol nanoparticles. The concentration of ammonium persulfate in the aqueous phase solution was 0.006 g / mL, and the concentration of 1,8-diazabicyclo[5.4.0]undec-7-ene in the aqueous phase solution was 0.3 mg / mL. The particle size of the obtained polyphenol nanoparticles was 180-210 nm as observed and analyzed by SEM.

[0070] Example 4

[0071] Catechol and tetraethylenepentamine were dissolved in a Tris-HCl buffer solution (pH = 8.5) to obtain an aqueous phase solution, the concentration of catechol in the aqueous phase solution was 0.06 mol / L, and the concentration of tetraethylenepentamine in the aqueous phase solution was 0.06 mol / L;

[0072] Perfluorooctyl ethoxy silane was dissolved in cyclohexane to obtain an oil phase solution, the concentration of perfluorooctyl ethoxy silane in the oil phase solution was 0.03 mol / L;

[0073] The aqueous phase solution and the oil phase solution were mixed to obtain a mixed solution, the volume ratio of the oil phase solution to the aqueous phase solution was 1:2, stirring was started, the rotating speed was 8000 rpm, sodium periodate and 1,8-diazabicyclo[5.4.0]undec-7-ene were added to the mixed solution, the solution was stirred at room temperature for 2 h, and then filtration, washing and drying were performed to obtain fluorine-containing polyphenol nanoparticles. The concentration of sodium periodate in the aqueous phase solution was 0.005 g / mL, and the concentration of triethylamine in the aqueous phase solution was 0.2 mg / mL. The particle size of the obtained fluorine-containing polyphenol nanoparticles was 90-130 nm as observed and analyzed by SEM.

[0074] Example 5

[0075] Epoxy group-containing silica nanoparticles were dispersed in a mixed solution, the volume ratio of a Tris-HCl buffer solution (pH = 8.5) to ethanol in the mixed solution was 1:1, and then aminopropyl triethoxysilane was added to the mixed solution to obtain an aqueous phase solution, the concentration of silica nanoparticles in the aqueous phase solution was 0.2 g / mL, and the concentration of aminopropyl triethoxysilane in the aqueous phase solution was 0.04 mol / L;

[0076] Perfluorooctyl ethoxy silane was dissolved in cyclohexane to obtain an oil phase solution, the concentration of perfluorooctyl ethoxy silane in the oil phase solution was 0.06 mol / L;

[0077] The aqueous phase solution is mixed with the oil phase solution to obtain a mixed solution, the volume ratio of the oil phase solution to the aqueous phase solution is 3:1, stirring is started, the rotating speed is 8000 rpm, sodium periodate solution and triethylamine are added into the mixed solution, stirring is performed for 2 h, filtration, washing and drying are performed to obtain fluorine-containing silica nanoparticles; the concentration of sodium periodate in the aqueous phase solution is 0.004 g / mL, and the concentration of triethylamine in the aqueous phase solution is 0.2 mg / mL triethylamine.

[0078] SEM observation and analysis show that the particle size of the obtained fluorine-containing silica nanoparticles is 20-30 nm.

[0079] Example 6

[0080] The amino-containing silica nanoparticles are dispersed in a mixed solution, the volume ratio of Tris-HCl buffer solution (pH = 8.5) to ethanol in the mixed solution is 1:1, and then aminopropyl triethoxysilane is added into the mixed solution to obtain an aqueous phase solution, the concentration of silica nanoparticles in the aqueous phase solution is 0.5 g / mL, and the concentration of aminopropyl triethoxysilane in the aqueous phase solution is 0.12 mol / L.

[0081] Perfluorooctyl ethoxysilane is dissolved in cyclohexane to obtain an oil phase solution, and the concentration of perfluorooctyl ethoxysilane in the oil phase solution is 0.04 mol / L.

[0082] The aqueous phase solution is mixed with the oil phase solution to obtain a mixed solution, the volume ratio of the oil phase solution to the aqueous phase solution is 3:1, stirring is started, the rotating speed is 8000 rpm, sodium periodate solution and triethylamine are added into the mixed solution, stirring is performed for 2 h, filtration, washing and drying are performed to obtain fluorine-containing silica nanoparticles; the concentration of sodium periodate in the aqueous phase solution is 0.005 g / mL, and the concentration of triethylamine in the aqueous phase solution is 0.3 mg / mL.

[0083] SEM observation and analysis show that the particle size of the obtained fluorine-containing silica nanoparticles is 30-50 nm.

[0084] According to the wettability test method, the water and oil-hexadecane contact angles on the surface of the core are determined, and the results are shown in Table 1.

[0085] According to the swelling test method of bentonite, the relative linear swelling rate of the bentonite sample block after 24 h is determined, and the results are shown in Table 1.

[0086] According to the debris thermal rolling recovery rate test method, the debris recovery rate after thermal rolling aging is determined, and the results are shown in Table 1.

[0087] Table 1 Liquid contact angle on the surface of the core, swelling rate of bentonite and shale recovery rate

[0088]

[0089] From Table 1, it can be seen that:

[0090] After the core slice surface is covered with the prepared amphiphobic nanoparticle dispersion, the surface wettability is changed from hydrophilic and oleophilic to superhydrophobic and oleophobic, and the surface wettability is changed;

[0091] After the bentonite sample is added with the prepared amphiphobic nanoparticle dispersion, the 24h linear expansion rate of the bentonite sample is significantly reduced compared with the bentonite sample without the addition of the amphiphobic nanoparticle dispersion.

[0092] After the debris is added into the prepared amphiphobic nanoparticle dispersion and aged, the hot roll recovery rate of the debris is significantly improved compared with the debris without the addition of the amphiphobic nanoparticle dispersion.

[0093] The test results show that the amphiphobicity of the obtained particles can effectively inhibit the adsorption and penetration of water on the shale surface, effectively inhibit the hydration swelling, and effectively protect the shale.

[0094] The amphiphobic nanoparticles are added into the drilling fluid base slurry, and the content of the amphiphobic nanoparticles is 3wt% of the base slurry, and the rheological property and the fluid loss property are determined, and the results are shown in Table 2.

[0095] Table 2 Influence of the prepared amphiphobic nanoparticle drilling fluid on the rheological property and the fluid loss property in the examples

[0096]

[0097]

[0098] From Table 2, it can be seen that at room temperature, after the addition of the obtained amphiphobic nanoparticles, the apparent viscosity of the drilling fluid changes unobviously, the plastic viscosity slightly decreases, and the dynamic shear force increases, indicating that the drilling fluid added with the amphiphobic nanoparticles has good rheological property; at the same time, the high temperature and high pressure fluid loss is obviously reduced by 30% to 45%, indicating that the amphiphobic nanoparticles can participate in the formation of the mud cake, so that the mud cake is more dense.

[0099] It should be noted that the above-described examples are only used to explain the present application and do not constitute any limitation on the present application. The present application is described by referring to typical examples, but it should be understood that the words used therein are descriptive and explanatory words, rather than limiting words. The present application can be modified within the scope of the claims of the present application, and the present application can be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and examples, it does not mean that the present application is limited to the specific examples disclosed therein, on the contrary, the present application can be extended to all other methods and applications having the same function.

Claims

1. A method of preparing amphiphobic nanoparticles, characterized in that, The method comprises the following steps: Step S1: adding a nanoparticle precursor and an amino-containing compound into a solvent I to obtain an aqueous solution; Step S2: adding a fluorine-containing compound into a solvent II to obtain an oil phase solution; Step S3: mixing the aqueous solution and the oil phase solution to obtain a mixed solution I, adding an oxidizing agent and a promoter into the mixed solution I, stirring, washing, and drying to obtain amphiphilic nanoparticles; The nanoparticle precursor is a polyphenol compound or a silica nanoparticle; the polyphenol compound is tannic acid or catechol; the silica nanoparticle is an amino-containing silica nanoparticle or an epoxy group-containing silica nanoparticle; When the nanoparticle precursor is a polyphenol compound, the solvent I is an acid-base buffer solution I; When the nanoparticle precursor is a silica nanoparticle, the solvent I comprises an acid-base buffer solution II and ethanol; The solvent II is one or more of n-hexane, cyclohexane, and heptane; The fluorine-containing compound is one or more of perfluorooctyl ethoxy silane, tridecafluoroheptyl epoxymethane, and nonafluoropentyl epoxymethane; The amino-containing compound is one of triethylenetetramine, tetraethylenepentamine, and aminopropyl triethoxysilane; The promoter is triethylamine or 1,8-diazabicyclo[5.4.0]undec-7-ene; The oxidizing agent comprises sodium periodate or ammonium persulfate.

2. The method of claim 1, wherein the amphiphobic nanoparticles are prepared by the method comprising: The volume ratio of the oil phase solution to the aqueous solution is 3:1 to 1:

3.

3. The method of claim 2, wherein the amphiphilic nanoparticles are prepared by the method comprising the steps of: The concentration of the fluorine-containing compound in the oil phase solution is 0.01 to 0.06 mol / L.

4. The method of claim 3, wherein the amphiphilic nanoparticles are prepared by the method comprising the steps of: The concentration of the amino-containing compound in the aqueous solution is 0.02 to 0.12 mol / L.

5. The method of claim 4, wherein the amphiphilic nanoparticles are prepared by the method comprising the steps of: The stirring rate is 5,000 to 8,000 rpm.

6. The method of claim 5, wherein the biophobic nanoparticles are prepared by the method comprising: The concentration of the oxidizing agent in the aqueous solution is 0.003 to 0.006 g / mL.

7. The method of claim 6, wherein the amphiphilic nanoparticles are prepared by the method comprising the steps of: The concentration of the promoter in the aqueous solution is 0.1 to 0.3 mg / mL.

8. The method of claim 1-7, wherein the amphiphobic nanoparticle is prepared by, The concentration of the polyphenol compound in the aqueous solution is 0.02 to 0.08 mol / L.

9. The method of claim 8, wherein the amphiphilic nanoparticles are prepared by the method comprising the steps of: The acid-base buffer solution I is a Tris-HCl buffer solution, and the pH value of the acid-base buffer solution I is 6.5 to 8.

5.

10. The method of claim 1-7, wherein the amphiphobic nanoparticle is prepared by, The volume ratio of the acid-base buffer solution to ethanol in the solvent I is 1:1 to 3.

11. The method of claim 10, wherein the amphiphobic nanoparticles are prepared by a method comprising: The concentration of the silica nanoparticle in the aqueous solution is 0.2 to 0.5 g / mL.

12. The method for preparing bihydrophobic nanoparticles according to claim 10, characterized in that, The acid-base buffer solution II is a Tris-HCl buffer solution, and the pH value of the acid-base buffer solution II is 6.5 to 8.

5.

13. A biphobic nanoparticle, characterized in that, The amphiphilic nanoparticle is a fluorine-containing polyphenol nanoparticle, which is prepared by the method for preparing the amphiphilic nanoparticle according to any one of claims 1 to 12.

14. The biphasic nanoparticle of claim 13, wherein, The particle size of the fluorine-containing polyphenol nanoparticle is 50 to 210 nm.

15. A biphobic nanoparticle, characterized in that, The amphiphilic nanoparticle is a fluorine-containing silica nanoparticle, which is prepared by the method for preparing the amphiphilic nanoparticle according to any one of claims 1 to 12.

16. The bipolar nanoparticle of claim 15, wherein, The particle size of the fluorine-containing silica nanoparticle is 20 to 50 nm.

17. Use of the amphiphilic nanoparticle according to any one of claims 13 to 16 in a drilling fluid.

18. A drilling fluid, characterized by, The drilling fluid comprises a base slurry and the amphiphobic nanoparticles of any one of claims 13-16, wherein the amphiphobic nanoparticles are 3 wt% of the base slurry; and the filtration loss of the drilling fluid is reduced by 30-45% compared to the filtration loss of the base slurry at 120°C and a pressure differential of 3.5 MPa.

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