A high-temperature resistant sand-fixing agent, its preparation method and application

Abstract

This invention provides a high-temperature resistant sand-fixing agent, its preparation method, and its application. The raw materials for preparing the high-temperature resistant sand-fixing agent, by weight, include 40-50 parts of bisphenol A cyanate resin, 20-30 parts of epoxy resin, 0.5-1.5 parts of catalyst, 10-20 parts of curing agent, 5-10 parts of hardener, 3-5 parts of fiber filler, and 20-40 parts of diluent. The high-strength, high-temperature resistant sand-fixing agent provided by this invention overcomes the technical problems of previous sand-fixing agents, such as high cost, low consolidation strength, narrow application range, and decreased oil well productivity after application. It extends the effective period of sand control in heavy oil thermal recovery wells, reduces the cost of the measure, and significantly increases the input-output ratio.

Description

Technical Field

[0001] This invention belongs to the field of oil well sand control, specifically relating to a high-temperature resistant sand-fixing agent, its preparation method and application, and particularly to a high-strength high-temperature resistant sand-fixing agent, its preparation method and application. Background Technology

[0002] Currently, heavy oil production both domestically and internationally is primarily developed through thermal recovery methods (steam injection, steam drive, SAGD, fire drive, etc.). Due to severe damage to formation cementitious materials under high temperature and pressure, many heavy oil production wells experience significant sand production. Sand control in steam injection wells is challenging, requiring sand control agents with excellent temperature resistance, and artificial wellbores capable of withstanding the scouring and erosion of high-temperature steam. Chemical sand control binds sand grains together in loose sandstone reservoirs, stabilizing the formation structure and achieving both symptomatic and root-cause treatment, offering advantages that other sand control measures cannot replace. Phenolic resin sand control agents have shown promising results and potential; however, their generally poor temperature resistance and high cost limit their application.

[0003] Chinese patent CN102311727B discloses a heat-resistant phenolic resin sand inhibitor, which can be used to improve the resistance of artificial wellbore (established by the sand inhibitor) to erosion and corrosion by high-temperature steam during steam injection, thereby extending the effective period of sand control in steam-driven oil wells. However, the temperature resistance of this sand inhibitor is still insufficient, and its compressive strength is not high enough, especially unable to meet the long-term erosion and corrosion requirements under steam-driven and fire-driven reservoir conditions.

[0004] Chinese patent CN106833585A discloses a water-based resin sand control agent, mainly used in formations with less severe sand production and where mechanical sand control measures have failed. It is injected into the formation without moving the tubing string to achieve sand control. It boasts advantages such as safe construction, easy injection into the formation, minimal formation damage, temperature and acid / alkali resistance, and oil resistance, achieving a sand suppression rate of over 90%, making it suitable for most sandstone reservoirs. However, this sand control agent also has drawbacks, including insufficient temperature resistance and inadequate bonding strength, which can easily lead to a decrease in oil well productivity.

[0005] Therefore, in order to effectively solve the sand production problem in heavy oil thermal recovery wells, especially to address the technical issues of high cost, low consolidation strength, narrow application range, and reduced well productivity after the implementation of sand control agents, it is urgent to develop a high-strength, high-temperature resistant sand control agent. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a high-temperature resistant sand-fixing agent, its preparation method, and its application, particularly a high-strength high-temperature resistant sand-fixing agent, its preparation method, and its application. The high-strength high-temperature resistant sand-fixing agent provided by this invention overcomes the technical problems of previous sand-fixing agents, such as high cost, low consolidation strength, narrow application range, and decreased oil well productivity after treatment. It extends the effective period of sand control in heavy oil thermal recovery wells, reduces treatment costs, and significantly increases the input-output ratio.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a high-temperature resistant sand-fixing agent, wherein the raw materials for preparing the high-temperature resistant sand-fixing agent include, by weight, 40-50 parts of bisphenol A cyanate resin, 20-30 parts of epoxy resin, 0.5-1.5 parts of catalyst, 10-20 parts of curing agent, 5-10 parts of hardener, 3-5 parts of fiber filler and 20-40 parts of diluent.

[0009] The bisphenol A cyanate resin can be present in quantities of 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 parts, the epoxy resin in quantities of 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 parts, and the catalyst in quantities of 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, or 1.5 parts. The number of parts of curing agent can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, etc.; the number of parts of hardener can be 5, 6, 7, 8, 9 or 10, etc.; the number of parts of fiber filler can be 3, 3.5, 4, 4.5 or 5, etc.; and the number of parts of diluent can be 20, 25, 30, 35 or 40, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0010] The above-mentioned products do not require the use of sand-carrying fluid, are simple and safe to apply, cause minimal damage to formation permeability, and have a strong adsorption effect on formation sand. When the resin liquid is squeezed into the formation, it is quickly adsorbed onto the surface of the sand particles, forming cement points between the sand particles. After the resin solidifies, it consolidates the loose formation sand into a solid artificial well wall, preventing formation sand from entering the wellbore and achieving the purpose of sand control. The sand-fixing agent contains polar groups, which are adsorbed onto the rock surface. After the wettability of the rock surface changes from oleophilic to hydrophilic, for the oil phase, the capillary force changes from resistance to driving force, and the oil phase permeability increases; for the water phase, the capillary force changes from driving force to resistance, and the water phase permeability decreases. The sand-fixing agent is solidified at high temperature and is resistant to high-temperature steam, making it suitable for sand control in thermal recovery wells. It has the advantages of high temperature resistance, high strength, and high sand-fixing permeability retention rate, and the sand-blocking particle size can reach 0.05mm.

[0011] Preferably, the epoxy resin includes E-51 epoxy resin and JF-45 phenolic epoxy resin.

[0012] The combination of the two specific epoxy resins and bisphenol A cyanate resin works synergistically to effectively bond with the surface of sand particles. Furthermore, due to the large number of polar groups in the resin molecules, they can form numerous hydrogen bonds with the hydroxyl groups on the surface of quartz sand. After dehydration at formation temperatures, they can also form covalent bonds. Moreover, due to the relatively regular molecular structure, a strong adsorption film can be formed on the surface of the sand particles, which plays a role in sand prevention. This results in the product having excellent high temperature resistance, high strength, and high sand-fixing permeability retention rate.

[0013] Preferably, the mass ratio of E-51 epoxy resin to JF-45 phenolic epoxy resin is (0.8-1.2):(0.8-1.2), for example, 0.8:1.2, 0.9:1.1, 1:1, 1.1:0.9, or 1.2:0.8, but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0014] Preferably, the catalyst comprises zinc octanoate and / or nonylphenol.

[0015] Preferably, the curing agent comprises methyltetrahydrophthalic anhydride and / or methylhexahydrophthalic anhydride, more preferably methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride.

[0016] The aforementioned specific curing agents have the advantages of long pot life, high heat resistance of cured products, and good high-temperature performance. At the same time, the use of optimized curing agent combinations can further improve the product effect.

[0017] Preferably, the hardener comprises any one or a combination of at least two of triethylenetetramine, tetraethylenepentamine, or m-phenylenediamine.

[0018] Preferably, the fiber filler comprises asbestos and / or glass fiber.

[0019] The addition of asbestos or glass fiber can significantly improve the temperature resistance and bonding strength of sand-stabilizing agents. This is because the softening and consolidation of resin at formation temperatures is an exothermic process, and the volume shrinkage causes numerous microcracks to appear in the resin-consolidated body. After the fiber filler is added, it forms a three-dimensional random distribution within the sand body, with micron-sized fine fibers penetrating between the cracks, thus acting as a crack inhibitor. The added fibers function similarly to the reinforcing bars in reinforced concrete, forming a three-dimensional network structure in the sand body. When the sand body is subjected to tensile and bending stress, the stress transfer mechanism of the fibers allows them to bear most of the stress, reducing the probability of resin sand body failure. Simultaneously, the fibers contain both "soft fibers" and "hard fibers." When formation fluids carry fine siltstone, the positively charged branches of the "soft fibers" are adsorbed, forming a fine silt aggregate. This fine sand aggregate and the larger sand particles are then bound within a three-dimensional network structure of "hard fibers" that are curled and spirally interlocked, thus preventing them from flowing into the wellbore and playing a dual role of "stabilizing sand" and "blocking sand".

[0020] Preferably, the diluent comprises any one or a combination of at least two of methanol, acetone, or ethanol.

[0021] Secondly, the present invention provides a method for preparing the high-temperature resistant sand-fixing agent as described above, the method comprising the following steps:

[0022] Bisphenol A cyanate resin is mixed with a catalyst and a diluent for prepolymerization, then mixed with epoxy resin for reaction, and finally mixed with a curing agent, a hardener, and a fiber filler to obtain the high-temperature resistant sand-fixing agent.

[0023] Preferably, the prepolymerization temperature is 110-130℃ and the time is 1.5-2h. The temperature can be 110℃, 115℃, 120℃, 125℃ or 130℃, etc., and the time can be 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2h, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0024] Preferably, the reaction temperature is 110-120℃ and the time is 1-2h. The temperature can be 110℃, 111℃, 112℃, 113℃, 114℃, 115℃, 116℃, 117℃, 118℃, 119℃ or 120℃, etc., and the time can be 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2h, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0025] Thirdly, the present invention also provides the application of the high-temperature resistant sand-fixing agent as described above in oil well sand control.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention provides a high-temperature resistant sand-fixing agent that eliminates the need for sand-carrying fluid, is simple and safe to apply, causes minimal damage to formation permeability, and exhibits strong adsorption to formation sand. When the resin solution is injected into the formation, it rapidly adsorbs onto the sand grain surface, forming cementation points between the grains. Once the resin solidifies, it binds the loose formation sand into a robust artificial well wall, preventing formation sand from entering the wellbore and achieving sand control. The sand-fixing agent contains polar groups that adsorb onto the rock surface. As the wettability of the rock surface changes from oleophilic to hydrophilic, for the oil phase, the capillary force changes from resistance to driving force, increasing oil phase permeability; for the water phase, the capillary force changes from driving force to resistance, decreasing water phase permeability. The sand-fixing agent is solidified at high temperatures and is resistant to high-temperature steam, making it suitable for sand control in thermal recovery wells. It boasts advantages such as high temperature resistance, high strength, and high sand-fixing permeability retention, with a sand-blocking particle size down to 0.05 mm. Attached Figure Description

[0028] Figure 1 These are morphological images of Example 1 group before high-temperature treatment under a 300℃ test condition in the high-temperature resistance performance test.

[0029] Figure 2 These are morphological images of Example 1 group after high-temperature treatment under a 300℃ test condition in the high-temperature resistance performance test. Detailed Implementation

[0030] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0031] In the following example, the bisphenol A cyanate resin was purchased from the Jinan Special Structure Research Institute of China Aviation Industry Corporation I, with a melting point of 79°C and a purity of >98%.

[0032] E-51 epoxy resin was purchased from Shanghai Resin Factory;

[0033] JF-45 phenolic epoxy resin was purchased from Wuxi Resin Factory.

[0034] Example 1

[0035] This embodiment provides a high-temperature resistant sand-fixing agent, prepared from the following raw materials (in parts by weight):

[0036] The composition includes 45 parts of bisphenol A cyanate resin, 25 parts of epoxy resin (E-51 epoxy resin and JF-45 phenolic epoxy resin, mass ratio 1:1), 1 part of catalyst (zinc octanoate and nonylphenol, mass ratio 1:1), 15 parts of curing agent (methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride, mass ratio 1:1), 7 parts of hardener (triethylenetetramine), 4 parts of fiber filler (asbestos), and 30 parts of diluent (methanol).

[0037] The preparation method is as follows:

[0038] Bisphenol A cyanate resin was mixed with a catalyst and a diluent and prepolymerized at 120°C for 1.7 hours. Then it was mixed with epoxy resin and reacted at 115°C for 1.5 hours. After that, it was mixed with a curing agent, a hardener, and a fiber filler to obtain the high-temperature resistant sand-fixing agent.

[0039] Example 2

[0040] This embodiment provides a high-temperature resistant sand-fixing agent, prepared from the following raw materials (in parts by weight):

[0041] The composition includes 40 parts of bisphenol A cyanate resin, 20 parts of epoxy resin (E-51 epoxy resin and JF-45 phenolic epoxy resin, mass ratio 1:1), 0.5 parts of catalyst (zinc octanoate), 10 parts of curing agent (methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride, mass ratio 1:1), 5 parts of hardener (tetraethylenepentamine), 3 parts of fiber filler (asbestos), and 20 parts of diluent (acetone).

[0042] The preparation method is the same as in Example 1.

[0043] Example 3

[0044] This embodiment provides a high-temperature resistant sand-fixing agent, prepared from the following raw materials (in parts by weight):

[0045] The composition includes 50 parts of bisphenol A cyanate resin, 30 parts of epoxy resin (E-51 epoxy resin and JF-45 phenolic epoxy resin, mass ratio 1:1), 1.5 parts of catalyst (nonylphenol), 20 parts of curing agent (methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride, mass ratio 1:1), 10 parts of hardener (tetraethylenepentamine), 5 parts of fiber filler (glass fiber), and 40 parts of diluent (ethanol).

[0046] The preparation method is the same as in Example 1.

[0047] Example 4

[0048] This embodiment provides a high-temperature resistant sand-fixing agent. Except for the fact that it does not contain methyltetrahydrophthalic anhydride and a portion is reduced and allocated to methylhexahydrophthalic anhydride, the raw materials are the same as in Example 1.

[0049] Example 5

[0050] This embodiment provides a high-temperature resistant sand-fixing agent. Except for the fact that it does not contain methylhexahydrophthalic anhydride and a portion is reduced and allocated to methyltetrahydrophthalic anhydride, the raw materials are the same as in Example 1.

[0051] Comparative Example 1

[0052] This comparative example provides a high-temperature resistant sand-fixing agent. The raw materials used in its preparation are identical to those in Example 1, except that they do not contain bisphenol A type cyanate resin and the reduced portion is allocated proportionally to E-51 epoxy resin and JF-45 phenolic epoxy resin.

[0053] Comparative Example 2

[0054] This comparative example provides a high-temperature resistant sand-fixing agent. The raw materials used in its preparation are identical to those in Example 1, except that they do not contain E-51 epoxy resin and the reduced portion is allocated proportionally to bisphenol A cyanate ester resin and JF-45 phenolic epoxy resin.

[0055] Comparative Example 3

[0056] This comparative example provides a high-temperature resistant sand-fixing agent. The raw materials used in its preparation are identical to those in Example 1, except that they do not contain JF-45 phenolic epoxy resin and the portion is reduced and allocated proportionally to E-51 epoxy resin and bisphenol A cyanate ester resin.

[0057] Comparative Example 4

[0058] This comparative example provides a high-temperature resistant sand-fixing agent. The raw materials used in its preparation are identical to those in Example 1, except that they do not contain asbestos.

[0059] Effect test:

[0060] The products provided in the above example will be tested as follows:

[0061] Sand filtering performance:

[0062] (1) The experimental sand simulating a certain block is loaded into a glass tube with a diameter of Φ25mm×100mm, and the ends are clamped with rubber stoppers and compacted. Calculate the net weight of the loaded quartz sand.

[0063] (2) Evacuate the water, saturate it with water, and calculate the PV number;

[0064] (3) Inject 1PV of the prepared sand-fixing agent, enlarge the hole with 1PV of diesel oil, and place it in a constant temperature water bath at 75℃ for 72 hours to solidify;

[0065] (4) Place the consolidated rock sample into the core holder, put a Φ25mm×25mm steel pipe in front of the core, fill the steel pipe with experimental sand (particle size not less than 0.05mm), and apply confining pressure.

[0066] (5) Displace 250 mL (1 mL / min) with clean water and analyze whether the filtrate contains sand and its particle size distribution;

[0067] (6) Displace 250 mL (0.5 mL / min) of formation oil from the Gaosheng oilfield and analyze whether the filtrate contains sand and its particle size composition.

[0068] The results are as follows:

[0069]

[0070]

[0071] The results above show that, in the product provided by this invention, when the same solidified sample is first displaced with water and then with crude oil, no sand particles are found in the filtrate. This indicates that the sand-fixing agent can block 0.05mm sand particles when injected at a dosage of 1PV, and the sand-blocking effect is obvious.

[0072] High temperature resistance:

[0073] Filter sand performance test steps (4) After the consolidated rock sample is cured at 60℃ and normal pressure for 48h, the compressive strength and permeability of the consolidated body are measured. Then, after being placed at 100℃ and 300℃ for different times, the compressive strength and permeability of each consolidated body are measured. The experimental results are shown below (wherein Figure 1-2 The images shown are morphological images of the product in Example 1 before and after high-temperature treatment under a 300℃ test condition:

[0074]

[0075]

[0076]

[0077]

[0078] The data above shows that the product provided by this invention has excellent high-temperature resistance, maintaining high compressive strength and high permeability even after high-temperature treatment. Comparative examples 1 and 4-5 show that this invention, by using a specific curing agent, can effectively improve the high-temperature resistance of the product. Comparative examples 1 and 1-3 show that this invention, by using a compound of E-51 epoxy resin, JF-45 phenolic epoxy resin, and bisphenol A cyanate resin, works synergistically to effectively improve the high-temperature resistance of the product. Meanwhile, from... Figure 1-2 As can be seen from the data, after high-temperature treatment, the solidified body showed no obvious signs of detachment, collapse, or deformation, indicating that it can effectively withstand high-temperature treatment, further demonstrating that the product provided by this invention has excellent high-temperature resistance.

[0079] Compressive strength test:

[0080] 10g of high-temperature resistant sand-stabilizing agent was mixed evenly with 40g of quartz sand, and then filled into a glass tube with a diameter of 25mm and a length of 100mm. The mixture was heated to 120℃ and held at that temperature for 5 hours. After cooling to 20℃, the compressive strength of the consolidated core was measured, and the results are as follows:

[0081]

[0082] The data above show that the product provided by this invention has excellent consolidation strength. Comparative Examples 1 and 4-5 show that this invention can effectively improve the consolidation strength of the product by using a specific curing agent. Comparative Examples 1 and 1-3 show that this invention can effectively improve the consolidation strength of the product by using a compound of E-51 epoxy resin, JF-45 phenolic epoxy resin and bisphenol A cyanate resin in a synergistic effect.

[0083] Penetration test:

[0084] The core permeability retention rate (i.e., permeability change) before and after consolidation in the above compressive strength test was tested. Then, the core was evacuated and saturated with water. The permeability before plugging was measured at a certain pump flow rate (0.1 mL / min). A certain amount of sand-fixing agent (0.1 PV of the core pore volume) was then injected into the core in the forward direction. The core with the sand-fixing agent was placed in an 80℃ water bath. After a period of time, the permeability after plugging was measured in the reverse direction. The plugging rate was calculated using the following formula:

[0085]

[0086] Where k is the core permeability (%), and Q is the injection flow rate (cm³). 3 ·s -1 μ is the fluid viscosity (mPa·s), L is the core length, ΔP is the flow pressure difference (MPa), and A is the core cross-sectional area (cm²). 2 E represents the core permeability retention rate (%), and k represents the core permeability retention rate (%). w0 Permeability (μm) of water before plugging 2 ), k w1 Permeability (μm) of water after plugging 2 ).

[0087] The results are as follows:

[0088]

[0089] The data above shows that the sand-fixing agent provided in this application contains polar groups, which are adsorbed onto the rock surface. After the wettability of the rock surface changes from oleophilic to hydrophilic, for the oil phase, the capillary force changes from resistance to driving force, and the oil phase permeability increases; for the water phase, the capillary force changes from driving force to resistance, and the water phase permeability decreases. The data also shows that the product provided by this invention has excellent water-blocking but not oil-blocking effects. Comparing Examples 1-5 and Comparative Examples 1-3 reveals that this invention, by employing E-51 epoxy resin, JF-45 phenolic epoxy resin, and bisphenol A cyanate ester resin under the action of a curing agent, can effectively improve the water-blocking but not oil-blocking effect of the product. Furthermore, a comparison of the data from Examples 1-3 and 4-5 shows that the synergistic use of the curing agents (methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride) helps to better consolidate the dispersed formation sand.

[0090] Field testing:

[0091] The product from Example 1 was field-tested. The test subject was a high-A well in a certain area, which was put into production in August 2008, with a cumulative production of 9,564 tons of fluid and 3,375 tons of oil. During the 12th cycle of operation, casing deformation was found during lead stamping. During pump inspection, 76m of sand was flushed out, including 1.4 cubic meters of fine sand with a median particle size of 0.07mm. Due to the casing deformation, it was decided to implement resin chemical sand control for the well.

[0092] Construction parameters: Designed sand-fixing radius 1m, 25t of high-strength, high-temperature resistant sand-fixing agent used in this embodiment, discharge rate 200-400L / min, pump pressure 3MPa, sand control construction began on April 12, 2023, steam injection started on April 18, 2023, steam injection parameters: boiler pressure 17.5MPa, discharge rate 12t / h, steam dryness 75%, steam injection volume 3000t. Production commenced on May 4, with continuous production for 270 days, accumulating a liquid production of 5641m³. 3 It produces 1315 tons of oil. Currently, its daily liquid production is 14.7 cubic meters. 3 The daily oil production is 3.8 tons, and the crude oil test showed that the sand content was 0, indicating that the measures have been very effective.

[0093] The applicant declares that this invention illustrates the high-temperature resistant sand-fixing agent, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials in the product, addition of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of this invention.

[0094] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0095] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A high-temperature resistant sand-fixing agent, characterized in that, The raw materials for preparing the high-temperature resistant sand-fixing agent include, by weight, 40-50 parts of bisphenol A cyanate resin, 20-30 parts of epoxy resin, 0.5-1.5 parts of catalyst, 10-20 parts of curing agent, 5-10 parts of hardener, 3-5 parts of fiber filler, and 20-40 parts of diluent. The epoxy resin includes E-51 epoxy resin and JF-45 phenolic epoxy resin; The mass ratio of E-51 epoxy resin to JF-45 phenolic epoxy resin is (0.8-1.2):(0.8-1.2).

2. The high-temperature resistant sand-fixing agent according to claim 1, characterized in that, The catalyst includes zinc octanoate and / or nonylphenol.

3. The high-temperature resistant sand-fixing agent according to claim 1, characterized in that, The curing agent includes methyltetrahydrophthalic anhydride and / or methylhexahydrophthalic anhydride.

4. The high-temperature resistant sand-fixing agent according to claim 3, characterized in that, The curing agent is methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride.

5. The high-temperature resistant sand-fixing agent according to claim 1, characterized in that, The hardener includes any one or a combination of at least two of triethylenetetramine, tetraethylenepentamine, or m-phenylenediamine.

6. The high-temperature resistant sand-fixing agent according to claim 1, characterized in that, The fiber filler includes asbestos and / or glass fiber.

7. The high-temperature resistant sand-fixing agent according to claim 1, characterized in that, The diluent includes any one or a combination of at least two of methanol, acetone, or ethanol.

8. A method for preparing a high-temperature resistant sand-fixing agent according to any one of claims 1-7, characterized in that, The preparation method includes the following steps: Bisphenol A cyanate resin is mixed with a catalyst and a diluent for prepolymerization, then mixed with epoxy resin for reaction, and finally mixed with a curing agent, a hardener, and a fiber filler to obtain the high-temperature resistant sand-fixing agent.

9. The preparation method according to claim 8, characterized in that, The prepolymerization temperature is 110-130℃, and the time is 1.5-2 h.

10. The preparation method according to claim 9, characterized in that, The reaction is carried out at a temperature of 110-120℃ for 1-2 hours.

11. The application of a high-temperature resistant sand-fixing agent according to any one of claims 1-7 in oil well sand control.

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