Treatment method of high-pressure-resistant fracturing valve body

Abstract

The invention discloses a treatment method of a high-pressure-resistant fracturing valve body, and relates to the technical field of surface treatment.The treatment method comprises the steps that a valve body base body is sequentially subjected to base body pretreatment and functional coating treatment; the method specifically comprises the following steps that after the surface of a valve body base body is polished and cleaned, aluminum oxide pellets are adopted for conducting a supersonic particle bombardment test on the surface of the base body, and a pretreated base body is obtained; glass flakes, boron carbide, molybdenum disulfide, cerium fluoride, titanium dioxide, talcum powder, polyether modified siloxane, silica powder and pH-sensitive corrosion inhibitor microspheres are sequentially added into graphene / polyether sulfone modified novolac epoxy resin to be mixed, a curing agent is added after uniform stirring, stirring and oil adding are continued, the surface of a pretreated matrix is coated with the mixture, and after drying, the graphene / polyether sulfone modified epoxy resin composite material is obtained. And the high-pressure-resistant fracturing valve body is obtained. According to the treatment method of the valve body, the high-temperature and high-pressure resistance and the oil field sewage corrosion resistance of the valve body can be remarkably improved.

Description

Technical Field

[0001] This application relates to the field of surface treatment technology, and in particular to a treatment method for a high-pressure fracturing valve body. Background Technology

[0002] In the process of oil and gas extraction, the underground environment is extremely complex, and the geological conditions and corrosive environment pose severe challenges to the durability of equipment. High-temperature, high-pressure steam (temperature range 80-150℃, pressure ≥20 MPa) from thousands of meters underground exerts a strong permeating effect on the equipment; simultaneously, crude oil and wastewater are rich in various corrosive media, such as sulfate ions. chloride ions nitrate ions cyanide ions and calcium ions These media, such as oxygen and gas, cause severe damage to the valve bodies of oil and gas well extraction equipment. This damage not only significantly shortens the service life of the valve bodies but also increases extraction costs, thus having a major impact on the economic benefits of enterprises. Therefore, effectively treating valve body materials to improve their corrosion resistance and resistance to high temperatures and pressures is crucial for improving oil and gas extraction efficiency and reducing extraction costs. Summary of the Invention

[0003] To improve the high-pressure impact resistance of valve bodies, this application provides a method for treating valve bodies resistant to high-pressure fracturing.

[0004] The method for processing a high-pressure fracturing valve body provided in this application adopts the following technical solution:

[0005] A method for treating a high-pressure fracturing valve body involves sequentially pretreating the valve body substrate and then applying a functional coating. The raw materials for the functional coating treatment include, by weight, 120-160 parts of graphene / polyethersulfone modified phenolic epoxy resin, 15-25 parts of glass flakes, 10-22 parts of boron carbide, 3-8 parts of molybdenum disulfide, 3-8 parts of cerium fluoride, 2-6 parts of titanium dioxide, 2-6 parts of talc, 2-5 parts of polyether modified siloxane, 3-9 parts of silica powder, 4-10 parts of pH-sensitive corrosion inhibitor microspheres, and 40-50 parts of curing agent.

[0006] Preferably, the raw materials for the functional coating treatment include, by weight: 140 parts graphene / polyethersulfone modified phenolic epoxy resin, 20 parts glass flakes, 16 parts boron carbide, 5.5 parts molybdenum disulfide, 5.5 parts cerium fluoride, 4 parts titanium dioxide, 4 parts talc, 3.5 parts polyether modified siloxane, 6 parts silica powder, 7 parts pH-sensitive corrosion inhibitor microspheres, and 45 parts curing agent.

[0007] Preferably, the graphene / polyethersulfone modified phenolic epoxy resin is made from the following raw materials in parts by weight: 0.1-0.3 parts reduced graphene oxide, 12-36 parts ethanol, 5-15 parts polyethersulfone powder, 25-75 parts N,N-dimethylformamide, and 50-150 parts liquid phenolic epoxy resin.

[0008] Preferably, the preparation method of the graphene / polyethersulfone modified phenolic epoxy resin includes the following steps:

[0009] S1. Add polyethersulfone powder to N,N-dimethylformamide, heat to 60-100℃, and stir until completely dissolved to obtain a polyethersulfone solution;

[0010] Reduced graphene oxide was added to ethanol and stirred until completely dissolved. The solution was then sonicated for 10-20 minutes in an ice bath to obtain a dispersion of reduced graphene oxide.

[0011] S2. Add liquid phenolic epoxy resin to polyethersulfone solution and stir at 60-100℃ for 40-60 min; then cool to 40-50℃, add dispersion of reduced graphene oxide, and stir at 1000-1400 rpm for 1-2 h; subject the obtained composite material to vacuum degassing in an oven at 110-130℃ for 5-10 min to obtain graphene / polyethersulfone modified phenolic epoxy resin.

[0012] Preferably, the preparation method of the pH-sensitive corrosion inhibitor microspheres includes the following steps:

[0013] S1. Add the corrosion inhibitor and polyacrylic acid resin to dichloromethane and stir until completely dissolved to obtain a mixed solution;

[0014] S2. Mix the mixed solution obtained in S1 with a 2% (w / w) polyvinyl alcohol aqueous solution at a volume ratio of 1:23-27 and stir continuously for 25-35 hours. After the reaction is complete, add water to dilute, centrifuge, and dry at room temperature for 3-5 days to obtain pH-sensitive corrosion inhibitor microspheres.

[0015] Preferably, the corrosion inhibitor is an imidazoline-based corrosion inhibitor.

[0016] Preferably, the mass ratio of the corrosion inhibitor, polyacrylic acid resin, and dichloromethane is 1:1-1.5:12-14.

[0017] Preferably, the method for processing the valve body includes the following steps:

[0018] S1. Substrate pretreatment: After polishing and cleaning the surface of the valve body substrate, the substrate surface is subjected to a supersonic particle bombardment test using alumina pellets to obtain a pretreated substrate.

[0019] S2. Functional Coating Treatment: Glass flakes, boron carbide, molybdenum disulfide, cerium fluoride, titanium dioxide, talc, polyether-modified siloxane, silica powder, and pH-sensitive corrosion inhibitor microspheres are successively added to graphene / polyethersulfone-modified phenolic epoxy resin and mixed. The mixture is then magnetically stirred for 10-20 minutes. After adding the curing agent and stirring for another 20-30 minutes, the mixture is coated onto the pretreated substrate surface and dried at 50-60℃ for 2-3 days to obtain a high-pressure fracturing valve body.

[0020] Preferably, the gas pressure of the supersonic particle bombardment test is 1.1-1.3 MPa; the injection angle is 80-85°; and the bombardment time is 90-120 s.

[0021] Preferably, the alumina pellets have a particle size of 20-60 μm.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. This application employs supersonic particle bombardment technology to pretreat the valve body substrate surface with alumina pellets. This not only significantly improves the surface hardness of the substrate, enhancing its fatigue and deformation resistance, but also effectively cleans the surface and increases its roughness, thus providing a better bonding foundation for the subsequent functional coating. Then, using graphene / polyethersulfone modified phenolic epoxy resin as the main material, and glass flakes, boron carbide, molybdenum disulfide, cerium fluoride, titanium dioxide, talc, polyether-modified siloxane, silica powder, and pH-sensitive corrosion inhibitor microspheres as functional fillers, a protective layer with excellent high-temperature and high-pressure resistance and corrosion resistance is coated onto the pretreated valve body surface, effectively improving its high-temperature and high-pressure resistance and corrosion resistance. Through the dual effects of surface pretreatment and functional coating, this application significantly extends the service life of the valve body, reduces mining costs, and improves the economic benefits of the enterprise.

[0024] 2. This application uses graphene and polyethersulfone to modify liquid phenolic epoxy resin, which significantly improves its high temperature resistance and wear resistance, thereby effectively improving the service life of the functional coating under high temperature and high pressure environment and effectively improving the protection effect on the valve body.

[0025] 3. The pH-sensitive corrosion inhibitor microspheres provided in this application have a polyacrylic acid resin shell, which will undergo protonation in an acidic environment with pH < 4. The molecular chains contract and break, releasing the internal corrosion inhibitor; imidazoline-based corrosion inhibitors are used, which exhibit excellent protective effects under complex working conditions such as high temperature, high pressure, high mineralization, and acidic gases. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments.

[0027] The chemical reagents used in the preparation examples, embodiments, and comparative examples provided in this invention are all commercially available products, and their brands and manufacturers are as follows:

[0028] Polyethersulfone powder, Guangdong Wengjiang Chemical Reagent Co., Ltd.;

[0029] Reduced graphene oxide, Shanghai Aladdin Biochemical Technology Co., Ltd., R485331;

[0030] Liquid phenolic epoxy resin F-44, Hubei Tuobang Chemical Co., Ltd.;

[0031] Naphthenic acid imidazoline corrosion inhibitor, Wuhan Jiyesheng Chemical Co., Ltd.;

[0032] Polyacrylic acid resin, Shanghai Yuanye Biotechnology Co., Ltd.;

[0033] Polyvinyl alcohol IV, Shanghai Aladdin Biochemical Technology Co., Ltd., Polyvinyl alcohol 5-88, P434362;

[0034] Polyether-modified siloxane SH101, Wuhan Huaxiang Kejie Biotechnology Co., Ltd.;

[0035] Cashew phenol modified phenolic amine curing agent, Wuhan Camick Technology Co., Ltd.

[0036] Preparation Example 1: Preparation of Graphene / Polyethersulfone Modified Phenolic Epoxy Resin

[0037] Preparation Example 1.1

[0038] S1. Add 5g of polyethersulfone powder to 25g of N,N-dimethylformamide, heat to 60℃, and stir until completely dissolved to obtain a polyethersulfone solution;

[0039] 0.1g of reduced graphene oxide was added to 12g of ethanol and stirred until completely dissolved. The mixture was then sonicated for 10 minutes in an ice bath to obtain a dispersion of reduced graphene oxide.

[0040] S2. Add 50g of liquid phenolic epoxy resin F-44 to the polyethersulfone solution and stir at 60℃ for 40min; then cool to 40℃, add the dispersion of reduced graphene oxide, and stir at 1000rpm for 1h; the resulting composite material is subjected to vacuum degassing treatment in an oven at 110℃ for 5min to obtain graphene / polyethersulfone modified phenolic epoxy resin.

[0041] Preparation Example 1.2

[0042] S1. Add 10g of polyethersulfone powder to 50g of N,N-dimethylformamide, heat to 80℃, and stir until completely dissolved to obtain a polyethersulfone solution;

[0043] 0.2g of reduced graphene oxide was added to 24g of ethanol and stirred until completely dissolved. The mixture was then sonicated for 15 minutes in an ice bath to obtain a dispersion of reduced graphene oxide.

[0044] S2. Add 100g of liquid phenolic epoxy resin F-44 to the polyethersulfone solution and stir at 80℃ for 50min; then cool to 45℃, add the dispersion of reduced graphene oxide, and stir at 1200rpm for 1.5h; subject the resulting composite material to vacuum degassing in an oven at 120℃ for 7.5min to obtain graphene / polyethersulfone modified phenolic epoxy resin.

[0045] Preparation Example 1.3

[0046] S1. Add 15g of polyethersulfone powder to 75g of N,N-dimethylformamide, heat to 100℃, and stir until completely dissolved to obtain a polyethersulfone solution;

[0047] 0.3g of reduced graphene oxide was added to 36g of ethanol and stirred until completely dissolved. The mixture was then sonicated for 20 minutes in an ice bath to obtain a dispersion of reduced graphene oxide.

[0048] S2. Add 150g of liquid phenolic epoxy resin F-44 to the polyethersulfone solution and stir at 100℃ for 60min; then cool to 50℃, add the dispersion of reduced graphene oxide, and stir at 1400rpm for 2h; the resulting composite material is subjected to vacuum degassing in an oven at 130℃ for 10min to obtain graphene / polyethersulfone modified phenolic epoxy resin.

[0049] Preparation Example 2: Preparation of pH-sensitive corrosion inhibitor microspheres

[0050] Preparation Example 2.1

[0051] S1. Add 1g of naphthenic acid imidazoline corrosion inhibitor and 1g of polyacrylic acid resin IV to 12g of dichloromethane, stir until completely dissolved, and obtain a mixed solution;

[0052] S2. Mix 2 mL of the mixed solution obtained in S1 with 46 mL of 2% polyvinyl alcohol aqueous solution and stir continuously for 25 h. After the reaction is completed, add 100 mL of water for dilution, centrifuge, and dry at room temperature for 3 days to obtain pH-sensitive corrosion inhibitor microspheres.

[0053] Preparation Example 2.2

[0054] S1. Add 1g of naphthenic acid imidazoline corrosion inhibitor and 1.25g of polyacrylic acid resin IV to 13g of dichloromethane, stir until completely dissolved, and obtain a mixed solution;

[0055] S2. Mix 2 mL of the mixed solution obtained in S1 with 50 mL of 2% polyvinyl alcohol aqueous solution and stir continuously for 30 h. After the reaction is completed, add 100 mL of water for dilution, centrifuge, and dry at room temperature for 4 days to obtain pH-sensitive corrosion inhibitor microspheres.

[0056] Preparation Example 2.3

[0057] S1. Add 1g of naphthenic acid imidazoline corrosion inhibitor and 1.5g of polyacrylic acid resin IV to 14g of dichloromethane, stir until completely dissolved, and obtain a mixed solution;

[0058] S2. Mix 2 mL of the mixed solution obtained in S1 with 54 mL of 2% polyvinyl alcohol aqueous solution and stir continuously for 35 h. After the reaction is completed, add 100 mL of water for dilution, centrifuge, and dry at room temperature for 4 days to obtain pH-sensitive corrosion inhibitor microspheres.

[0059] Example 1

[0060] S1. Substrate pretreatment: AISI 4130 alloy valve body was used as the substrate. After polishing the surface of the valve body substrate and cleaning it with alcohol, the substrate surface was subjected to a supersonic particle bombardment test using 20μm alumina pellets. The gas pressure of the supersonic particle bombardment test was 1.1MPa, the jet angle was 80°, and the bombardment time was 90s, thus obtaining the pretreated substrate.

[0061] S2. Functional Coating Treatment: 15g of glass flakes, 10g of boron carbide, 3g of molybdenum disulfide, 3g of cerium fluoride, 2g of titanium dioxide, 2g of talc, 2g of polyether-modified siloxane SH101, 3g of silica powder, and 4g of pH-sensitive corrosion inhibitor microspheres prepared in Preparation Example 2.1 were successively added to 120g of graphene / polyethersulfone-modified phenolic epoxy resin prepared in Preparation Example 1.1 and mixed. The mixture was magnetically stirred at 400rpm for 10min, and then 40g of cashew phenol-modified phenolic amine curing agent was added. After stirring for another 20min, the mixture was coated onto the pretreated substrate surface with a coating thickness of 300μm. The coating was dried at 50℃ for 2d to obtain a high-pressure fracturing valve body.

[0062] Example 2

[0063] S1. Substrate pretreatment: AISI 4130 alloy valve body was used as the substrate. After polishing the surface of the valve body substrate and cleaning it with alcohol, the substrate surface was subjected to a supersonic particle bombardment test using 20μm alumina pellets. The gas pressure of the supersonic particle bombardment test was 1.1MPa, the jet angle was 80°, and the bombardment time was 90s, thus obtaining the pretreated substrate.

[0064] S2. Functional Coating Treatment: 20g of glass flakes, 16g of boron carbide, 5.5g of molybdenum disulfide, 5.5g of cerium fluoride, 4g of titanium dioxide, 4g of talc, 3.5g of polyether-modified siloxane SH101, 6g of silica powder, and 7g of pH-sensitive corrosion inhibitor microspheres prepared in Preparation Example 2.1 were successively added to 140g of graphene / polyethersulfone-modified phenolic epoxy resin prepared in Preparation Example 1.1 and mixed. The mixture was magnetically stirred at 500rpm for 15min, and then 45g of cashew phenol-modified phenolic amine curing agent was added. After stirring for another 25min, the mixture was coated onto the pretreated substrate surface with a coating thickness of 300μm. The coating was dried at 55℃ for 2.5d to obtain a high-pressure fracturing valve body.

[0065] Example 3

[0066] S1. Substrate pretreatment: AISI 4130 alloy valve body was used as the substrate. After polishing the surface of the valve body substrate and cleaning it with alcohol, the substrate surface was subjected to a supersonic particle bombardment test using 20μm alumina pellets. The gas pressure of the supersonic particle bombardment test was 1.1MPa, the jet angle was 80°, and the bombardment time was 90s, thus obtaining the pretreated substrate.

[0067] S2. Functional Coating Treatment: 25g of glass flakes, 22g of boron carbide, 8g of molybdenum disulfide, 8g of cerium fluoride, 6g of titanium dioxide, 6g of talc, 5g of polyether-modified siloxane SH101, 9g of silica powder, and 10g of pH-sensitive corrosion inhibitor microspheres prepared in Preparation Example 2.1 were successively added to 120g of graphene / polyethersulfone-modified phenolic epoxy resin prepared in Preparation Example 1.1 and mixed. The mixture was magnetically stirred at 600rpm for 20min, and then 50g of cashew phenol-modified phenolic amine curing agent was added. After stirring for another 30min, the mixture was coated onto the pretreated substrate surface with a coating thickness of 300μm. The coating was dried at 60℃ for 3d to obtain a high-pressure fracturing valve body.

[0068] Example 4

[0069] S1. Substrate Pretreatment: AISI 4130 alloy valve body was used as the substrate. After polishing the surface of the valve body substrate and cleaning it with alcohol, the substrate surface was subjected to a supersonic particle bombardment test using 40μm alumina pellets. The gas pressure of the supersonic particle bombardment test was 1.2MPa, the jet angle was 82.5°, and the bombardment time was 105s, thus obtaining the pretreated substrate.

[0070] S2. Functional Coating Treatment: 15g of glass flakes, 10g of boron carbide, 3g of molybdenum disulfide, 3g of cerium fluoride, 2g of titanium dioxide, 2g of talc, 2g of polyether-modified siloxane SH101, 3g of silica powder, and 4g of pH-sensitive corrosion inhibitor microspheres prepared in Preparation Example 2.1 were successively added to 120g of graphene / polyethersulfone-modified phenolic epoxy resin prepared in Preparation Example 1.1 and mixed. The mixture was magnetically stirred at 400rpm for 10min, and then 40g of cashew phenol-modified phenolic amine curing agent was added. After stirring for another 20min, the mixture was coated onto the pretreated substrate surface with a coating thickness of 300μm. The coating was dried at 50℃ for 2d to obtain a high-pressure fracturing valve body.

[0071] Example 5

[0072] S1. Substrate pretreatment: AISI 4130 alloy valve body was used as the substrate. After polishing the surface of the valve body substrate and cleaning it with alcohol, the substrate surface was subjected to a supersonic particle bombardment test using 60μm alumina pellets. The gas pressure of the supersonic particle bombardment test was 1.3MPa, the jet angle was 85°, and the bombardment time was 120s, thus obtaining the pretreated substrate.

[0073] S2. Functional Coating Treatment: 15g of glass flakes, 10g of boron carbide, 3g of molybdenum disulfide, 3g of cerium fluoride, 2g of titanium dioxide, 2g of talc, 2g of polyether-modified siloxane SH101, 3g of silica powder, and 4g of pH-sensitive corrosion inhibitor microspheres prepared in Preparation Example 2.1 were successively added to 120g of graphene / polyethersulfone-modified phenolic epoxy resin prepared in Preparation Example 1.1 and mixed. The mixture was magnetically stirred at 400rpm for 10min, and then 40g of cashew phenol-modified phenolic amine curing agent was added. After stirring for another 20min, the mixture was coated onto the pretreated substrate surface with a coating thickness of 300μm. The coating was dried at 50℃ for 2d to obtain a high-pressure fracturing valve body.

[0074] Example 6

[0075] The difference between Example 6 and Example 1 is that the graphene / polyethersulfone modified phenolic epoxy resin used in Example 6 was prepared by Example 1.2.

[0076] Example 7

[0077] The difference between Example 7 and Example 1 is that the graphene / polyethersulfone modified phenolic epoxy resin used in Example 7 was prepared from Preparation Example 1.3.

[0078] Example 8

[0079] The difference between Example 8 and Example 1 is that the pH-sensitive corrosion inhibitor microspheres used in Example 8 were prepared from Preparation Example 2.2.

[0080] Example 9

[0081] The difference between Example 9 and Example 1 is that the pH-sensitive corrosion inhibitor microspheres used in Example 9 were prepared from Preparation Example 2.3.

[0082] Comparative Example 1

[0083] The difference between Comparative Example 1 and Example 1 is that the substrate surface was not pretreated in Comparative Example 1, and the functional coating was applied directly.

[0084] Comparative Example 2

[0085] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 did not perform functional coating treatment on the substrate, but only pretreatment.

[0086] Comparative Example 3

[0087] The difference between Comparative Example 3 and Example 1 is that the functional coating used in Comparative Example 3 uses unmodified liquid phenolic epoxy resin F-44 instead of graphene / polyethersulfone modified phenolic epoxy resin.

[0088] Comparative Example 4

[0089] The difference between Comparative Example 4 and Example 1 is that the functional coating used in Comparative Example 4 did not contain pH-sensitive corrosion inhibitor microspheres.

[0090] Performance testing

[0091] I. Adhesion grade test: The coating adhesion of the valve body was determined according to the method in Appendix G of SY / T0315-2013. The results are shown in Table 1.

[0092] II. Impact resistance test: The impact resistance of the valve body was tested according to the method in Appendix E of SY / T0315-2013. The maximum impact strength value that the valve body can withstand was recorded. The results are shown in Table 1.

[0093] III. High Temperature and High Pressure Resistance: The valve bodies obtained in Examples 1-9 were placed in a high temperature and high pressure reactor, 3% sodium chloride brine was added, the temperature was adjusted to 150°C, and nitrogen gas was introduced to a pressure of 20 MPa. After 168 hours, the test pieces were taken out, cooled to room temperature, and the coating surface was observed to see if there were any blistering, cracking, or peeling phenomena. The results are shown in Table 1.

[0094] IV. Resistance to oilfield wastewater: The valve bodies obtained in Examples 1-9 were placed in a specimen bottle, and oilfield wastewater was poured in until the specimen was 2 / 3 full. The specimen bottle was placed in an 80℃ oven. After 30 days, the specimen was taken out, rinsed with distilled water, and the coating surface was observed to see if there was any blistering, cracking, or peeling. The results are shown in Table 1.

[0095] The specific test results are as follows:

[0096] Table 1 Performance Test Results

[0097] As can be seen from the test results of Examples 1-9 in Table 1, the valve body treatment method provided in this application significantly improves the high temperature and high pressure resistance of the valve body after supersonic particle bombardment test pretreatment and functional coating treatment, and also significantly enhances the corrosion resistance of oilfield sewage; the maximum impact strength value that the valve body can withstand reaches 20J and above, indicating that the valve body treatment method provided in this application can significantly improve the high pressure impact resistance of the valve body.

[0098] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for treating a high-pressure fracturing valve body, characterized in that: The valve body substrate is subjected to substrate pretreatment and functional coating treatment in sequence; The raw materials for the functional coating treatment include, by weight, 120-160 parts of graphene / polyethersulfone modified phenolic epoxy resin, 15-25 parts of glass flakes, 10-22 parts of boron carbide, 3-8 parts of molybdenum disulfide, 3-8 parts of cerium fluoride, 2-6 parts of titanium dioxide, 2-6 parts of talc, 2-5 parts of polyether modified siloxane, 3-9 parts of silica powder, 4-10 parts of pH-sensitive corrosion inhibitor microspheres, and 40-50 parts of curing agent.

2. The method for processing a high-pressure fracturing valve body according to claim 1, characterized in that: The raw materials for the functional coating treatment include, by weight: 140 parts graphene / polyethersulfone modified phenolic epoxy resin, 20 parts glass flakes, 16 parts boron carbide, 5.5 parts molybdenum disulfide, 5.5 parts cerium fluoride, 4 parts titanium dioxide, 4 parts talc, 3.5 parts polyether modified siloxane, 6 parts silica powder, 7 parts pH-sensitive corrosion inhibitor microspheres, and 45 parts curing agent.

3. The method for processing a high-pressure fracturing valve body according to claim 1 or 2, characterized in that: The graphene / polyethersulfone modified phenolic epoxy resin is made from the following raw materials in parts by weight: 0.1-0.3 parts reduced graphene oxide, 12-36 parts ethanol, 5-15 parts polyethersulfone powder, 25-75 parts N,N-dimethylformamide, and 50-150 parts liquid phenolic epoxy resin.

4. The method for processing a high-pressure fracturing valve body according to claim 3, characterized in that: The preparation method of the graphene / polyethersulfone modified phenolic epoxy resin includes the following steps: S1. Add polyethersulfone powder to N,N-dimethylformamide, heat to 60-100℃, and stir until completely dissolved to obtain a polyethersulfone solution; Reduced graphene oxide was added to ethanol and stirred until completely dissolved. The solution was then sonicated for 10-20 minutes in an ice bath to obtain a dispersion of reduced graphene oxide. S2. Add liquid phenolic epoxy resin to polyethersulfone solution and stir at 60-100℃ for 40-60 min; then cool to 40-50℃, add dispersion of reduced graphene oxide, and stir at 1000-1400 rpm for 1-2 h; subject the obtained composite material to vacuum degassing in an oven at 110-130℃ for 5-10 min to obtain graphene / polyethersulfone modified phenolic epoxy resin.

5. A method for processing a high-pressure fracturing valve body according to claim 1 or 2, characterized in that: The preparation method of the pH-sensitive corrosion inhibitor microspheres includes the following steps: S1. Add the corrosion inhibitor and polyacrylic acid resin to dichloromethane and stir until completely dissolved to obtain a mixed solution; S2. Mix the mixed solution obtained in S1 with a 2% (w / w) polyvinyl alcohol aqueous solution at a volume ratio of 1:23-27 and stir continuously for 25-35 hours. After the reaction is complete, add water to dilute, centrifuge, and dry at room temperature for 3-5 days to obtain pH-sensitive corrosion inhibitor microspheres.

6. The method for processing a high-pressure fracturing valve body according to claim 5, characterized in that: The corrosion inhibitor is an imidazoline-based corrosion inhibitor.

7. The method for processing a high-pressure fracturing valve body according to claim 5, characterized in that: The mass ratio of the corrosion inhibitor, polyacrylic acid resin, and dichloromethane is 1:1-1.5:12-14.

8. The method for processing a high-pressure fracturing valve body according to claim 1, characterized in that: The method for processing the valve body includes the following steps: S1. Substrate pretreatment: After polishing and cleaning the surface of the valve body substrate, the substrate surface is subjected to a supersonic particle bombardment test using alumina pellets to obtain a pretreated substrate. S2. Functional Coating Treatment: Glass flakes, boron carbide, molybdenum disulfide, cerium fluoride, titanium dioxide, talc, polyether-modified siloxane, silica powder, and pH-sensitive corrosion inhibitor microspheres are successively added to graphene / polyethersulfone-modified phenolic epoxy resin and mixed. The mixture is then magnetically stirred for 10-20 minutes. After adding the curing agent and stirring for another 20-30 minutes, the mixture is coated onto the pretreated substrate surface and dried at 50-60℃ for 2-3 days to obtain a high-pressure fracturing valve body.

9. The method for processing a high-pressure fracturing valve body according to claim 8, characterized in that: The gas pressure for the supersonic particle bombardment test was 1.1-1.3 MPa; the injection angle was 80-85°; and the bombardment time was 90-120 s.

10. The method for processing a high-pressure fracturing valve body according to claim 8, characterized in that: The alumina pellets have a particle size of 20-60 μm.

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