Composite material logging cable resin formula and preparation method thereof

Abstract

The invention discloses a composite material logging cable resin formula and a preparation method thereof, and the method comprises the following steps: taking fluorine-containing anhydride and epoxy resin according to a molar ratio of 1: (2-10), heating the epoxy resin to 110-150 DEG C, dropwise adding the fluorine-containing anhydride, adding a ring-opening catalyst, and reacting to prepare fluorine modified epoxy resin; and mixing the mixture with a curing agent, a toughening agent, aerogel and a curing catalyst according to a specific mass ratio, stirring for 15-30 minutes at 200-300 r / min, curing for 30-60 minutes at 120-150 DEG C, and cooling to obtain the product. The glass transition temperature of the modified epoxy resin is 160-220 DEG C, the tensile strength is 70-85 MPa, the modified epoxy resin can resist 80 DEG C and 20% sulfuric acid and can be boiled in water for 72 hours under 3 MPa, the modified epoxy resin is suitable for 150-180 DEG C and 15-30 MPa deep well environment, the corrosion resistance and the mechanical property are excellent, and the modified epoxy resin is suitable for preparing oil and gas exploitation equipment parts.

Description

Technical Field

[0001] This application relates to the field of synthetic resin technology, and in particular to a composite material logging cable resin formulation and its preparation method. Background Technology

[0002] With the continuous advancement of oil and gas exploration and development technologies, the drilling and oil production processes of these deep wells face high temperatures of 150-180℃, high pressures of 15-30MPa, and highly corrosive and complex geological conditions containing hydrogen sulfide gas and sulfuric acid solutions, which place stringent requirements on the performance of materials used in downhole equipment.

[0003] Epoxy resins possess excellent processing properties, environmental safety, and bonding performance, making them particularly suitable for forming high-performance composite materials with carbon fibers, and thus hold significant application potential in the oil and gas extraction field. However, the heat resistance, acid and alkali corrosion resistance, and long-term processing stability of traditional epoxy resins are not suitable for the extreme environments of deep wells. Their long-term heat resistance temperature is difficult to exceed 150℃, they are prone to corrosion failure in high-concentration sulfuric acid or hydrogen sulfide environments, and their mechanical strength rapidly decays under high temperature and pressure, failing to meet the long-term performance requirements of downhole equipment.

[0004] Current methods for modifying epoxy resins cannot simultaneously address the issue of synergistically improving heat resistance and corrosion resistance, meaning that modified epoxy resins still cannot fully adapt to the complex working conditions of deep well oil and gas extraction.

[0005] Therefore, how to develop a modified epoxy resin preparation method that can adapt to the high temperature, high pressure and high corrosion environment of deep wells and has excellent heat resistance, corrosion resistance, mechanical stability and process feasibility has become a key technical problem that needs to be solved to promote the efficient development of deep oil and gas resources. Summary of the Invention

[0006] This application provides a composite material logging cable resin formulation and its preparation method, which solves the problem in the prior art that it is difficult to simultaneously improve heat resistance and corrosion resistance.

[0007] In a first aspect, embodiments of this application provide a method for preparing composite logging cable resin, comprising: Obtain a fluoroanhydride and an epoxy resin, wherein the molar ratio of the fluoroanhydride to the epoxy resin is 1:2-10; The epoxy resin is placed in a reaction vessel and heated to 110-150°C. Then, a fluoro anhydride is added dropwise at a uniform rate. After the addition is complete, the mixture is stirred continuously at 110-150°C for 15-60 minutes until the fluoro anhydride is completely dissolved in the epoxy resin to obtain the epoxy anhydride. A ring-opening catalyst is added to the epoxy anhydride, the temperature is raised to 120-150℃ and kept at that temperature, the reaction is carried out for 30-60 minutes and then cooled to room temperature to obtain a fluorinated epoxy resin. The ring-opening catalyst is used to catalyze the ring-opening reaction of the epoxy anhydride. The fluorinated epoxy resin, curing agent, toughening agent, aerogel, and curing catalyst are sequentially added to a sealed mixing container and stirred at 200-300 r / min for 15-30 minutes at room temperature to obtain a modified epoxy resin mixture. The mass ratio of the fluorinated epoxy resin, curing agent, toughening agent, aerogel, and curing catalyst is 100:25-95:20-30:0.1-5:1-5. The modified epoxy resin mixture is placed in a mold and placed in a constant temperature curing oven. The mixture is kept at 120-150℃ for 30-60 minutes to carry out the curing reaction. After the curing reaction is completed, it is cooled to room temperature to obtain the modified epoxy resin.

[0008] In conjunction with the first aspect, in one possible implementation, the fluoroanhydride comprises one or more of aromatic or aliphatic fluoroanhydrides; wherein the aromatic fluoroanhydride comprises tetrafluorophthalic anhydride, 3-fluorophthalic anhydride, 3,6-difluorophthalic anhydride, 4,5-difluorophthalic anhydride, hexafluorodianhydride, and 5-fluoroindocyanine anhydride; and the aliphatic fluoroanhydride comprises trifluoroacetic anhydride, pentafluoropropionic anhydride, heptafluorobutyric anhydride, perfluoroglutaric anhydride, and tetrafluorosuccinic anhydride.

[0009] In conjunction with the first aspect, in one possible implementation, the epoxy resin comprises one or more of aliphatic diol diglycidyl ether, polyether diol diglycidyl ether, polyether triol triglycidyl ether, bisphenol glycidyl ether, or alicyclic epoxides; wherein the bisphenol glycidyl ethers include bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, and tetramethylbisphenol A diglycidyl ether; and the alicyclic epoxides include bis(3,4-epoxycyclohexylmethyl) oxalate, bis(3,4-epoxycyclohexylmethyl) adipate, and vinylcyclohexene diepoxide, wherein the CAS (CAS Registry Number) of bis(3,4-epoxycyclohexylmethyl) adipate is 10161-33-4, and the CAS number of vinylcyclohexene diepoxide is 10161-33-4.

[0010] In conjunction with the first aspect, in one possible implementation, the ring-opening catalyst is a quaternary phosphonium salt or a quaternary ammonium salt; wherein the quaternary phosphonium salt is tetrabutylphosphine bromide, and the quaternary ammonium salt is tetrabutylammonium bromide; the mass ratio of the ring-opening catalyst to the total mass of the epoxy resin and the fluoroanhydride is 0.5-2:100.

[0011] In conjunction with the first aspect, in one possible implementation, the curing agent comprises one or more of amine curing agents or acid anhydride curing agents; the amine curing agent comprises ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, m-phenylenediamine, m-phenylenediamine, diethyltoluenediamine, diaminodiphenylmethane, and diaminodiphenyl sulfone; the acid anhydride curing agent comprises methyltetrahydrophthalic anhydride (MTHPA), methylnadic anhydride (NMA), hexahydrophthalic anhydride (HHPA), methylhexahydrophthalic anhydride (MHHPA), and dodecenylsuccinic anhydride (DDSA).

[0012] In conjunction with the first aspect, in one possible implementation, the toughening agent comprises one or more of ATBN liquid-terminated aminobutadiene nitrile rubber, core-shell rubber, or polymeric toughening agents; the polymeric toughening agent is DURACELL CS-100 polymeric toughening agent or DURACELL CS230 polyetheramine modified toughening agent; the toughening agent has a purity greater than or equal to 98%, and a viscosity of 500-1500 m at 25°C. .

[0013] In conjunction with the first aspect, in one possible implementation, the aerogel is a SiO2 aerogel or a Si3N4 aerogel; the aerogel has a density of 3-200 kg / m³, a porosity of 80%-99.8%, and a specific surface area of ​​100-2000 m² / g.

[0014] In conjunction with the first aspect, in one possible implementation, the curing catalyst comprises one or more of amine catalysts or imidazole catalysts; the amine catalyst comprises benzyl dimethylamine (BDMA), tris(dimethylaminomethyl)phenol (DMP-30), and triethylenediamine (TEDA); the imidazole catalyst comprises 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecylimidazole trimellitate, and epoxy-imidazolium adducts; the mass ratio of the curing catalyst to the modified epoxy resin is 1-5:100.

[0015] Secondly, embodiments of this application provide a modified epoxy resin prepared using the method for preparing composite logging cable resin as described in the first aspect or any possible implementation of the first aspect, comprising: The fluorinated groups of the modified epoxy resin are chemically bonded to the epoxy resin matrix, and the aerogel particles are uniformly dispersed in the matrix. The modified epoxy resin has a curing glass transition temperature of 160-220℃, a tensile strength of 70-85MPa, an elongation of 4%-8%, a failure temperature of 130-180℃ after boiling in water for 72 hours under 3MPa pressure, a weight loss rate of less than or equal to 1.5% after immersion in a 20% sulfuric acid solution at 80℃ for 72 hours, and a temperature of 310-340℃ at which the weight residue rate is 95% in thermogravimetric analysis.

[0016] Thirdly, embodiments of this application provide an application of the modified epoxy resin prepared using the method for preparing composite logging cable resin as described in the first aspect or any possible implementation of the first aspect, including: The modified epoxy resin is used to prepare core components of deep or ultra-deep well oil and gas exploration and production equipment, suitable for geological environments with temperatures of 150-180℃ and pressures of 15-30MPa, and with sulfuric acid solutions containing hydrogen sulfide gas at a volume fraction of less than or equal to 5% or a mass fraction of less than or equal to 20% in the environmental medium; the core components include pump and valve bodies, pipeline liners, and wellhead seals.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: In this embodiment, a fluoroanhydride and epoxy resin are mixed in a molar ratio of 1:2-10. The epoxy resin is heated to 110-150°C and the fluoroanhydride is added dropwise, stirred until dissolved to obtain the epoxy anhydride. A ring-opening catalyst is added, and the mixture is kept at 120-150°C for 30-60 minutes. After cooling, a fluorinated epoxy resin is obtained. The fluorinated epoxy resin, curing agent, toughening agent, aerogel, and curing catalyst are added to a sealed container in a mass ratio of 100:25-95:20-30:0.1-5:1-5. The mixture is stirred at 200-300 rpm for 15-30 minutes at room temperature to obtain a mixture. The mixture is placed in a mold and cured at 120-150°C for 30-60 minutes. After cooling, the modified epoxy resin is obtained. The modified epoxy resin prepared in this application has a curing glass transition temperature of 160-220℃, a tensile strength of 70-85MPa, and can withstand boiling in water at 80℃ and 20% sulfuric acid for 72 hours at 3MPa. It is suitable for deep well environments of 150-180℃ and 15-30MPa and is applicable to the preparation of components for oil and gas extraction equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic flowchart illustrating a method for preparing composite logging cable resin, as provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] The following description of some technologies involved in the embodiments of this application is provided to aid understanding and should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, some descriptions of well-known functions and structures are omitted in the following description.

[0022] like Figure 1 As shown, Figure 1 This application provides a schematic flowchart of a method for preparing a composite logging cable resin. The process includes three core stages: synthesis of fluorine-modified epoxy resin, preparation of modified epoxy resin mixture, and curing. Figure 1 The steps shown are implemented to obtain the following embodiment: Example 1: FEP-01 type modified epoxy resin (bisphenol A epoxy-anhydride curing system).

[0023] 1.1 Formulation design (by weight parts).

[0024] Table 1: FEP-01 Epoxy Resin Formulation

[0025] 1.2 Preparation steps of each core component.

[0026] (1) Synthesis of FEP-01 fluorine-modified epoxy resin.

[0027] Weigh out 200g of bisphenol A diglycidyl ether (epoxy equivalent EEW175-190), 76g of tetrafluorophthalic anhydride (3,4,5,6-tetrafluorophthalic anhydride) (molar ratio 1:2), and 2.76g of tetrabutylphosphine bromide (quaternary phosphonium salt catalyst) (1% of the total mass of epoxy and fluoroanhydride).

[0028] Bisphenol A diglycidyl ether was placed in a 500 mL four-necked reactor, and stirring was started (200 rpm). The mixture was heated to 110-120 °C. After the temperature stabilized, tetrafluorophthalic anhydride was added dropwise at a uniform rate over a period of 15 minutes to avoid local overheating. After the addition was complete, the mixture was stirred at 110-120 °C for another 30 minutes until the tetrafluorophthalic anhydride was completely dissolved (the system was transparent and homogeneous). Tetrabutylphosphine bromide catalyst was added, and the temperature was raised to 120 °C and maintained for 30 minutes, with continuous stirring (250 rpm). After the reaction was completed, the heating was turned off, and the mixture was allowed to cool naturally to room temperature to obtain a pale yellow transparent FEP-01 fluorinated epoxy resin, which was then sealed for later use.

[0029] (2) Preparation of modified epoxy resin mixture.

[0030] Open a 500mL sealed stirred tank (with temperature control device), first add 100 parts of FEP-01 fluorinated modified epoxy resin, and stir at room temperature (200rpm); then add 25 parts of NMA curing agent and 20 parts of DURACELLCS-100 toughening agent in sequence, stirring for 10 minutes after each component is added until evenly dispersed; then add 5 parts of AeroVaD50 aerogel, increase the stirring speed to 250rpm, and stir for 15 minutes (ensuring no agglomeration of aerogel); finally add 1 part of EMERCATCS-5047 and 1 part of EMERCATCS-5000, and continue stirring for 10 minutes to obtain a homogeneous modified epoxy resin mixture (appearance as a white, fine paste with no obvious particles).

[0031] (3) Curing and shaping.

[0032] A polytetrafluoroethylene mold (100mm×10mm×4mm) was used, with the inner wall coated with a release agent. The mixture was poured into the mold and gently shaken to remove air bubbles. The mold was placed in a constant temperature curing oven, set at 120℃, and kept at that temperature for 30 minutes. After curing, the mold was removed and allowed to cool naturally to room temperature (25℃). The mold was then demolded to obtain the FEP-01 type modified epoxy resin sample.

[0033] 1.3 Performance test results.

[0034] Glass transition temperature (TG): 200℃ was measured using a differential scanning calorimeter.

[0035] Tensile strength / elongation: Tested according to GB / T2567-2021 standard using a universal testing machine (tensile rate 5mm / min), the tensile strength is 70MPa and the elongation is 4%.

[0036] Water boiling resistance: In a 3MPa pressure vessel, after 72 hours of continuous boiling, the mechanical strength of the sample decreased to 84% of the initial value when the temperature was raised to 130℃ (below 85%, it was judged as failure), and the failure temperature was 130℃.

[0037] Sulfuric acid corrosion resistance: After immersing in a 20% sulfuric acid solution at 80℃ for 72 hours, the sample showed no obvious corrosion or bubbling, and the weight loss rate was 0.6%, thus passing the test.

[0038] Thermogravimetric analysis (TGA): Tested using a thermogravimetric analyzer, the temperature at which 95% weight residue is achieved is 310℃.

[0039] Example 2: FEP-02 type modified epoxy resin (bisphenol F epoxy-amino-terminated rubber toughening system).

[0040] 2.1 Formulation design (by weight parts).

[0041] Table 2: FEP-02 Epoxy Resin Formulation

[0042] 2.2 Preparation steps (refer to Example 1, only the differentiating parts are adjusted).

[0043] (1) Synthesis of FEP-02 fluorine-modified epoxy resin.

[0044] 200g of bisphenol F diglycidyl ether (EEW175-190) was used to replace bisphenol A epoxy resin. The remaining raw materials (76g of tetrafluorophthalic anhydride and 2.76g of tetrabutylphosphine bromide) and process parameters (dissolving at 110-120℃ and holding at 120℃ for 30 minutes) were the same as in Example 1 to obtain FEP-02 fluorinated epoxy resin (pale yellow transparent liquid).

[0045] (2) Preparation and curing of mixtures.

[0046] The toughening agent was replaced with ATBN: After adding 20 parts of ATBN, the stirring speed was increased to 280 rpm and stirred for 12 minutes (the terminal amino rubber needs to be more fully dispersed); the remaining mixing order, curing temperature (120°C), and curing time (30 minutes) were the same as in Example 1.

[0047] 2.3 Performance test results.

[0048] Curing temperature (TG): 210℃.

[0049] Tensile strength / elongation: 75MPa / 5% (ATBN toughening increases elongation).

[0050] Water boiling failure temperature: 150℃ (3MPa, 72 hours).

[0051] Resistance to 20% sulfuric acid (80℃, 72 hours): Passed, weight loss rate 0.8%.

[0052] TGAT95: 315℃.

[0053] Example 3: FEP-03 type modified epoxy resin (phenolic epoxy-high heat resistance system).

[0054] 3.1 Formulation design (by weight parts).

[0055] Table 3: FEP-03 Epoxy Resin Formulation

[0056] 3.2 Preparation steps.

[0057] (1) Synthesis of FEP-03 fluorine-modified epoxy resin.

[0058] 200g of phenolic epoxy resin (EEW175) was heated to 115-120℃ (phenolic epoxy has a slightly higher viscosity and requires a slightly higher temperature to dissolve), and 76g of tetrafluorophthalic anhydride was added. The mixture was stirred for 35 minutes until completely dissolved. The remaining process was the same as in Example 1, and FEP-03 fluorinated epoxy resin (light brown transparent liquid) was obtained.

[0059] (2) Preparation and curing of mixtures.

[0060] The curing temperature was increased to 125℃ (phenolic epoxy curing requires a slightly higher temperature), and the temperature was maintained for 35 minutes; the remaining steps were the same as in Example 1.

[0061] 3.3 Performance test results.

[0062] Curing temperature (TG): 220℃ (phenolic epoxy structure improves heat resistance).

[0063] Tensile strength / elongation: 85MPa / 4% (optimal strength).

[0064] Water boiling failure temperature: 160℃ (3MPa, 72 hours).

[0065] Resistance to 20% sulfuric acid (80℃, 72 hours): Passed, weight loss rate 0.7%.

[0066] TGAT95: 340℃ (TGA performance is optimal).

[0067] Example 4: FEP-04 type modified epoxy resin (1,4-butadiene epoxy-amine curing dual formulation system).

[0068] 4.1 Formulation design (by weight parts).

[0069] Formula A (acid anhydride curing).

[0070] Table 4: Formulation of FEP-04 Anhydride Cured Epoxy Resin

[0071] Formula B (amine curing).

[0072] Table 5: Formulation of FEP-04 Amine-Curated Epoxy Resin

[0073] 4.2 Preparation steps (taking formulation B as an example, with differentiated explanations).

[0074] (1) Synthesis of FEP-04 fluorine-modified epoxy resin.

[0075] 200g of 1,4-butadiene epoxy resin was heated to 110-115℃, and 76g of tetrafluorophthalic anhydride was added. The mixture was stirred for 30 minutes to dissolve. The remaining process was the same as in Example 1, and FEP-04 fluorinated epoxy resin (colorless and transparent liquid) was obtained.

[0076] (2) Preparation and curing of mixtures.

[0077] The amine curing agent needs to be mixed quickly. After adding 95 parts of DETDA, the stirring speed is increased to 300 rpm and stirred for 8 minutes (to avoid premature reaction of the amine). The curing temperature is lowered to 115°C and kept at that temperature for 40 minutes (the curing reaction rate of amine is relatively slow). The remaining steps are the same as in Example 1.

[0078] 4.3 Performance test results.

[0079] Formula A (acid anhydride curing).

[0080] Curing temperature (TG): 160℃; Tensile strength / elongation: 75MPa / 6%; Water boiling failure temperature: 180℃; TGAT95: 330℃.

[0081] Formula B (amine curing).

[0082] Curing temperature (TG): 180℃; Tensile strength / elongation: 75MPa / 8% (amine-based curing has the highest elongation); Water boiling failure temperature: 180℃; TGAT95: 320℃.

[0083] The optimization tests of key process parameters are shown in Table 6.

[0084] Table 6: Effect of fluorine-modified epoxy resin synthesis process on the binding rate of fluorine-containing groups

[0085] When the molar ratio is 1:2-10, the binding rate of fluorine-containing groups is ≥97% (chemical bond, no precipitation), while when the ratio is outside the range (1:1), the binding rate is only 65%, and the water resistance is significantly reduced.

[0086] Table 7: Effect of aerogel addition amount on the water boiling resistance of modified epoxy resin

[0087] When the amount of aerogel added is 0.1-5 parts, the water boiling failure temperature is increased by 15-65℃, and TGAT95 is increased by 15-65℃. It also synergistically improves the heat resistance and hydrolysis resistance with fluorine-containing groups.

[0088] Table 7: Effect of curing temperature on the TG and tensile properties of modified epoxy resin.

[0089]

[0090] The optimal performance is achieved at a curing temperature of 120-150℃. Too low a temperature will result in incomplete curing (low TG, low strength), while too high a temperature will result in resin degradation (reduced strength).

[0091] Table 8: Effect of toughening agent type on elongation of modified epoxy resin

[0092] Toughening agents can significantly improve elongation (from 2.1% to 4-8%) without affecting corrosion resistance.

[0093] II. Proportional Design.

[0094] Comparative Example 1: The molar ratio of fluoro anhydride exceeded the limit (1:1).

[0095] Formulation: Tetrafluorophthalic anhydride to bisphenol A epoxy in a molar ratio of 1:1 (or 1:2-10), with the remaining components and amounts consistent with Example 1.

[0096] Process: Same as in Example 1.

[0097] Performance results: Fluorine group binding rate 65% (precipitated after boiling in water), curing temperature TG 110℃, tensile strength 58MPa, water boiling failure temperature 85℃, weight loss rate of 20% sulfuric acid 7.8%, TGAT 95250℃ (all lower than Example 1).

[0098] Comparative Example 2: Missing aerogel.

[0099] Formulation: No aerogel, the remaining components and amounts are the same as in Example 1.

[0100] Process: Same as in Example 1.

[0101] Performance results: Curing temperature TG170℃, tensile strength 62MPa, water boiling failure temperature 100℃, TGAT95285℃ (heat resistance and water boiling resistance are significantly reduced).

[0102] Comparative Example 3: Fluorine-containing groups were not chemically bonded.

[0103] Formulation: 100 parts bisphenol A epoxy + 5 parts PTFE powder (to replace fluorine-modified epoxy), the remaining components are the same as in Example 1.

[0104] Process: Directly mix PTFE powder without chain extension polymerization.

[0105] Performance results: After boiling in water for 24 hours, PTFE precipitates (surface turns white), mechanical strength decreases to 68% of initial value (failure), and sulfuric acid resistance weight loss rate is 6.3%.

[0106] The necessity of chemical bonding of fluorine-containing groups is verified by Table 1 and Comparative Example 3, and the necessity of synergistic effect of aerogel is verified by Table 2 and Comparative Example 2. The combination of the two enables the material to meet the standards for heat resistance (TG160-220℃), corrosion resistance (resistance to 80℃ 20% sulfuric acid), and mechanical properties (70-85MPa).

[0107] Example 3 (TG220℃, T95340℃) is suitable for deep wells (180℃+, 15-30MPa) in the Tarim Basin, and Example 4 (elongation rate 8%) is suitable for downhole vibration and impact, fully meeting the application scenarios of oil and gas extraction equipment components.

[0108] The performance deviation rate of the same batch in Examples 1-4 is ≤3% (e.g., the TG of the three repeated experiments in Example 1 is 200±2℃), which meets the requirements for long-term process stability.

[0109] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A method for preparing a composite logging cable resin, characterized in that, include: Obtain a fluoroanhydride and an epoxy resin, wherein the molar ratio of the fluoroanhydride to the epoxy resin is 1:2-10; The epoxy resin is placed in a reaction vessel and heated to 110-150°C. Then, a fluoro anhydride is added dropwise at a uniform rate. After the addition is complete, the mixture is stirred continuously at 110-150°C for 15-60 minutes until the fluoro anhydride is completely dissolved in the epoxy resin to obtain the epoxy anhydride. A ring-opening catalyst is added to the epoxy anhydride, the temperature is raised to 120-150℃ and kept at that temperature, the reaction is carried out for 30-60 minutes and then cooled to room temperature to obtain a fluorinated epoxy resin. The ring-opening catalyst is used to catalyze the ring-opening reaction of the epoxy anhydride. The fluorinated epoxy resin, curing agent, toughening agent, aerogel, and curing catalyst are sequentially added to a sealed mixing container and stirred at 200-300 r / min for 15-30 minutes at room temperature to obtain a modified epoxy resin mixture. The mass ratio of the fluorinated epoxy resin, curing agent, toughening agent, aerogel, and curing catalyst is 100:25-95:20-30:0.1-5:1-5. The modified epoxy resin mixture is placed in a mold and placed in a constant temperature curing oven. The mixture is kept at 120-150℃ for 30-60 minutes to carry out the curing reaction. After the curing reaction is completed, it is cooled to room temperature to obtain the modified epoxy resin.

2. The method according to claim 1, characterized in that, The fluoroanhydride includes one or more of aromatic or aliphatic fluoroanhydrides; wherein the aromatic fluoroanhydride includes tetrafluorophthalic anhydride, 3-fluorophthalic anhydride, 3,6-difluorophthalic anhydride, 4,5-difluorophthalic anhydride, hexafluorodianhydride, and 5-fluoroindigo anhydride; and the aliphatic fluoroanhydride includes trifluoroacetic anhydride, pentafluoropropionic anhydride, heptafluorobutyric anhydride, perfluoroglutaric anhydride, and tetrafluorosuccinic anhydride.

3. The method according to claim 1, characterized in that, The epoxy resin comprises one or more of aliphatic diol diglycidyl ether, polyether diol diglycidyl ether, polyether triol triglycidyl ether, bisphenol glycidyl ether, or alicyclic epoxides; wherein the bisphenol glycidyl ethers include bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, and tetramethylbisphenol A diglycidyl ether; and the alicyclic epoxides include bis(3,4-epoxycyclohexylmethyl) oxalate, bis(3,4-epoxycyclohexylmethyl) adipate, and vinylcyclohexene diester.

4. The method according to claim 1, characterized in that, The ring-opening catalyst is a quaternary phosphonium salt or a quaternary ammonium salt; wherein the quaternary phosphonium salt is tetrabutylphosphine bromide, and the quaternary ammonium salt is tetrabutylammonium bromide; the mass ratio of the ring-opening catalyst to the total mass of the epoxy resin and the fluoroanhydride is 0.5-2:

100.

5. The method according to claim 1, characterized in that, The curing agent includes one or more of amine curing agents or acid anhydride curing agents; the amine curing agents include ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, m-phenylenediamine, m-phenylenediamine, diethyltoluenediamine, diaminodiphenylmethane, and diaminodiphenyl sulfone; the acid anhydride curing agents include methyltetrahydrophthalic anhydride (MTHPA), methylnadic anhydride (NMA), hexahydrophthalic anhydride (HHPA), methylhexahydrophthalic anhydride (MHHPA), and dodecenylsuccinic anhydride (DDSA).

6. The method according to claim 1, characterized in that, The toughening agent comprises one or more of ATBN liquid-terminated aminobutadiene nitrile rubber, core-shell rubber, or polymer toughening agents; the polymer toughening agent is DURACELL CS-100 polymer toughening agent or DURACELL CS230 polyetheramine modified toughening agent; the toughening agent has a purity greater than or equal to 98%, and a viscosity of 500-1500 m at 25°C. .

7. The method according to claim 2, characterized in that, The aerogel is a SiO2 aerogel or a Si3N4 aerogel; the density of the aerogel is 3-200 kg / m³, the porosity is 80%-99.8%, and the specific surface area is 100-2000 m² / g.

8. The method according to claim 1, characterized in that, The curing catalyst includes one or more of amine catalysts or imidazole catalysts; the amine catalyst includes benzyl dimethylamine (BDMA), tris(dimethylaminomethyl)phenol (DMP-30), and triethylenediamine (TEDA); the imidazole catalyst includes 2-methylimidazolium, 2-ethyl-4-methylimidazolium, 1-cyanoethyl-2-undecylimidazolium trimellitate, and epoxy-imidazolium adducts; the mass ratio of the curing catalyst to the modified epoxy resin is 1-5:

100.

9. A modified epoxy resin prepared using the method for preparing composite logging cable resin according to any one of claims 1-8, characterized in that, include: The fluorinated groups of the modified epoxy resin are chemically bonded to the epoxy resin matrix, and the aerogel particles are uniformly dispersed in the matrix. The modified epoxy resin has a curing glass transition temperature of 160-220℃, a tensile strength of 70-85MPa, an elongation of 4%-8%, a failure temperature of 130-180℃ after boiling in water for 72 hours under 3MPa pressure, a weight loss rate of less than or equal to 1.5% after immersion in a 20% sulfuric acid solution at 80℃ for 72 hours, and a temperature of 310-340℃ at which the weight residue rate is 95% in thermogravimetric analysis.

10. The application of a modified epoxy resin prepared using the method for preparing composite logging cable resin according to any one of claims 1-8, characterized in that, include: The modified epoxy resin is used to prepare core components of deep or ultra-deep well oil and gas exploration and production equipment, suitable for geological environments with temperatures of 150-180℃ and pressures of 15-30MPa, and with sulfuric acid solutions containing hydrogen sulfide gas at a volume fraction of less than or equal to 5% or a mass fraction of less than or equal to 20% in the environmental medium; the core components include pump and valve bodies, pipeline liners, and wellhead seals.

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