A light and high-strength fracturing proppant and preparation method thereof

Abstract

The present invention relates to the field of preparation of light high-strength fracturing proppants, and in particular to a light high-strength fracturing proppant and a preparation method thereof, which mainly comprises the following steps: S1: mixing a main material, a reinforcing agent and water to prepare a raw material ball, sintering the raw material ball to prepare a pre-finished product; the main material is composed of coal gangue and bauxite; the reinforcing agent is composed of manganese dioxide, Nd2O3 and carbon nanotubes in a mass ratio of (2-3): (1-3): (3-4); S2: heating and melting an adhesive resin, coating the surface of the pre-finished product obtained in step S1, and drying to obtain the product. The present application has the advantages of improving the mechanical properties of the proppant and reducing the breakage rate of the proppant.

Description

Technical Field

[0001] The present invention relates to the field of preparation of light-weight and high-strength fracturing proppants, and in particular to a light-weight and high-strength fracturing proppant and a preparation method thereof. Background Art

[0002] In the exploitation of oil fields, due to the high viscosity of oil in the oil fields, low porosity of rock formations and poor connectivity, great difficulties are caused to the exploitation of oil fields. In order to improve the yield of crude oil and the oil production rate, proppants are needed to improve the connectivity of rock formation voids during the exploitation process. At the same time, due to the very complex downhole environment, the proppant is easily eroded by oil, oil gas, water, steam, acid and alkali corrosive liquids and microorganisms in the rock formation during use, which reduces the mechanical properties of the proppant. In the existing technology, people directly use quartz sand and ceramsite sand as proppants. This type of proppant has strong supporting performance and can play a skeleton role in the rock formation, but its impact resistance is poor, which makes the proppant easy to break and fall off when subjected to external pressure, affecting the proppant's diversion performance for crude oil, and thus affecting the exploitation of crude oil.

[0003] In the above-mentioned related technologies, the inventors believe that the mechanical properties of existing proppants need to be improved, and the anti-breakage rate needs to be improved. Summary of the Invention

[0004] In order to improve the mechanical properties of the proppant and reduce the breakage rate of the proppant, the present application provides a lightweight and high-strength fracturing proppant and a preparation method thereof.

[0005] In a first aspect, the present application provides a method for preparing a lightweight, high-strength fracturing proppant, which adopts the following technical solution:

[0006] A method for preparing a lightweight, high-strength fracturing proppant comprises the following steps: S1: mixing a main material, a reinforcing agent, and water to prepare raw material balls, and sintering the raw material balls to prepare pre-finished products; the main material comprises coal gangue and bauxite; the reinforcing agent comprises manganese dioxide, Nd2O3, and carbon nanotubes in a mass ratio of (2-3):(1-3):(3-4);

[0007] S2: Heat and melt the adhesive resin, coat the surface of the pre-finished product obtained in step S1, and dry it.

[0008] By adopting the above technical solution, the main material, the reinforcing agent and water are first mixed. Since the main material contains coal gangue and bauxite, the reinforcing agent is composed of manganese dioxide, Nd2O3 and carbon nanotubes. After the coal gangue and bauxite are mixed with the reinforcing agent to prepare raw material balls, they are calcined together. The coal gangue and bauxite can provide silicon dioxide and aluminum oxide. During the calcination process, silicon dioxide and aluminum oxide jointly generate mullite crystal phase and magnesium aluminum spinel phase. The mullite crystal phase and magnesium aluminum spinel phase grow and develop at high temperature, so that the mullite phase and magnesium aluminum spinel are well interwoven together. Since the mullite crystal phase has good flexural strength and high corrosion resistance, it is combined with magnesium aluminum spinel to generate a dense network structure inside the proppant, so that the prepared proppant has good mechanical strength. In combination with the reinforcing agent, the addition of manganese dioxide can nucleate inside the proppant, and the valence-changed manganese ions can diffuse rapidly during the calcination process. The diffused manganese ions can promote the support Lattice distortion occurs inside the proppant, which increases the forming rate of the mullite crystal phase and the magnesium-aluminum spinel crystal phase, and accelerates the formation of a dense structure inside the proppant; the addition of Nd2O3 can increase the density of the combination of the mullite crystal phase and the magnesium-aluminum spinel, reduce the pores inside the proppant, promote the discharge of gas during the preparation of the pre-finished product, reduce the number of pores in the proppant, and improve the mechanical properties of the prepared proppant; the carbon nanotubes themselves have a relatively regular structure and few surface defects, which makes the carbon nanotubes have excellent mechanical properties. After being added to the proppant, they can play a good filling role, further improving the mechanical properties of the pre-finished product; and by coating the surface of the pre-finished product with an adhesive resin, the adhesive resin has good elasticity and can absorb and buffer the pressure on the internal pre-finished product. At the same time, the adhesive resin can also protect the internal pre-finished product, reduce the breakage of the pre-finished product, improve the mechanical strength of the prepared proppant, and make the proppant have better pressure resistance during use and reduce the breakage rate.

[0009] Optionally, the adhesive resin is composed of phenolic resin and polyphenol type glycidyl ether epoxy resin in a mass ratio of (2-3): (3-5).

[0010] By adopting the above technical solution, the polyphenol-type glycidyl ether epoxy resin contains epoxy groups and hydroxyl groups, and the epoxy groups and hydroxyl groups can give the polyphenol-type glycidyl ether epoxy resin a higher reactivity, so that it can undergo condensation and cross-linking with the phenolic resin, so that the mechanical properties of the prepared adhesive resin are enhanced and the bonding force is better. At the same time, the cured adhesive resin also has a strong cohesive force, thereby improving the mechanical properties of the proppant; at the same time, the adhesive resin composed of the phenolic resin and the polyphenol-type glycidyl ether epoxy resin also has good heat resistance and rigidity, so that the adaptability of the proppant to the environment during use is improved, and the proppant has better supporting performance during use; the polyphenol-type glycidyl ether epoxy resin used in this application is trisphenol methane triglycidyl ether epoxy resin.

[0011] Optionally, the sintering temperature in step S1 is 1350-1500°C.

[0012] By adopting the above technical solution, the sintering temperature of the raw material ball is adjusted. As the sintering temperature increases, a needle-shaped mullite crystal phase structure will gradually be generated inside the raw material ball. As the sintering time increases, the needle-shaped mullite crystal phase structure continues to coarsen. At the same time, the needle-shaped mullite structures cross each other to form a pore structure. At the same time, as the sintering temperature increases, a liquid phase is formed inside the raw material ball. The liquid phase fills between the needle-shaped mullite crystal phases, reducing the gaps between the needle-shaped mullite crystal phases and improving the density of the internal structure of the proppant. However, as the sintering temperature continues to increase, a large amount of liquid phase tightly wraps the mullite crystal phase and the quartz crystal phase together, which easily causes large closed pores to appear inside the pre-finished product, thereby affecting the mechanical properties of the subsequently prepared proppant.

[0013] Optionally, the carbon nanotubes in the reinforcing agent are pretreated before use, and the pretreatment comprises the following steps: placing the carbon nanotubes in an acid solution for immersion, then taking them out and placing them in a hydrogen peroxide solution for immersion, and then taking them out and drying them.

[0014] By adopting the above technical solution, the carbon nanotubes are pretreated before use. The surface of the carbon nanotubes is etched and roughened by the acid treatment. When the carbon nanotubes are subsequently mixed with other raw materials in the proppant, the combination is more firmly. At the same time, the oxidation effect of hydrogen peroxide can produce more active -OH or -COOH functional groups on the surface of the carbon nanotubes. After the carbon nanotubes are mixed to prepare a pre-finished product, when the surface of the pre-finished product is coated with an adhesive resin, the interface bonding strength between the adhesive resin and the carbon nanotubes is improved, thereby further improving the mechanical properties of the prepared proppant, achieving a better supporting effect and preventing breakage.

[0015] Optionally, when the carbon nanotubes are immersed in the acid solution, the acid solution is simultaneously subjected to ultrasonic treatment.

[0016] By adopting the above technical solution, when the carbon nanotubes are treated with acid, the carbon nanotubes are shortened under the action of ultrasonic vibration to obtain open carbon nanotubes, so that the acid can enter the interior of the carbon nanotubes, and -OH or -COOH functional groups are generated on the inner and outer walls of the carbon nanotubes. As a result, when the carbon nanotubes are subsequently combined with other raw materials, the combination with other raw materials is more firmly established, further improving the mechanical properties of the prepared proppant.

[0017] Optionally, the polyphenol-type glycidyl ether epoxy resin is modified before use to prepare a modified epoxy resin. The preparation method of the modified epoxy resin comprises the following steps:

[0018] S11: mixing a polyphenol-type glycidyl ether epoxy resin and a bismaleimide resin to prepare a mixture;

[0019] S12: Melt the mixture prepared in step S11, and extrude and granulate.

[0020] By adopting the above technical solution, the polyphenol-type glycidyl ether epoxy resin has good mechanical properties, strong ability to adhere to coal gangue and bauxite, and is also resistant to acid and alkali, but its own mechanical impact resistance is poor; because the bismaleimide resin has an imide ring structure, its mechanical properties and thermal stability are strong, it also has good toughness, and has good compatibility with the polyphenol-type glycidyl ether epoxy resin. By mixing the polyphenol-type glycidyl ether epoxy resin with the bismaleimide resin, the toughness and impact resistance of the prepared modified epoxy resin are improved, so that after the prepared adhesive resin is wrapped on the surface of the pre-finished product, the prepared support agent has better support performance and lower breakage rate; the polyphenol-type glycidyl ether epoxy resin used in this application is trisphenol methane triglycidyl ether epoxy resin.

[0021] Optionally, when heating and melting the adhesive resin in step S2, nut shell powder is also added to the adhesive resin.

[0022] By adopting the above technical solution, the main chemical components contained in the nut shell powder include cellulose, polypentose and lignin. The phenolic units in these components can be combined with the phenolic resin under heating. At the same time, the phenolic resin can react with the reactive groups present in the nut shell powder, thereby improving the compatibility of the nut shell and the adhesive resin. When the nut shell powder is added to the adhesive resin, it can play a good filling role in the adhesive resin, further improving the density of the adhesive resin after curing, so that after the adhesive resin is coated on the surface of the pre-finished product, the mechanical properties of the prepared proppant are better, and the breakage rate of the proppant after being subjected to force is reduced.

[0023] Optionally, the main material is composed of coal gangue and bauxite in a mass ratio of (1-3):(1-7).

[0024] By adopting the above technical solution, the mass ratio of coal gangue to bauxite is adjusted. When the amount of coal gangue added is large, it will affect the plasticity of the prepared raw balls, making the raw balls difficult to shape, reducing the ball formation rate, and affecting the subsequent preparation of proppants; when the amount of coal gangue added is insufficient, the sintering temperature required for the raw balls during calcination will become higher, but the higher sintering temperature will cause the raw balls to stick together during the sintering process, resulting in a decrease in the uniformity of the mullite crystal phase generated in the sintering process when it is rapidly generated in all directions, and the density and uniformity of the cross-linked structure of the pre-finished product in the generated proppant are reduced, thereby affecting the mechanical properties of the prepared proppant.

[0025] In a second aspect, the present application provides a lightweight and high-strength fracturing proppant;

[0026] A light high-strength fracturing proppant prepared according to a preparation method of a light high-strength fracturing proppant.

[0027] By adopting the above technical scheme, a lightweight and high-strength proppant is prepared using the preparation method of a lightweight and high-strength fracturing proppant, coal gangue and bauxite are used as main materials, mullite crystal phase and magnesia-aluminum spinel crystal phase are generated during the calcination process, and manganese dioxide, Nd2O3 and carbon nanotubes are compounded to prepare a reinforcing agent. By mixing the reinforcing agent with other raw materials in the proppant, the mechanical properties of the prepared pre-finished product are improved during the sintering process, and by wrapping the adhesive resin on the surface of the pre-finished product, the adhesive resin can absorb and buffer the pressure exerted on the proppant, reduce the squeezing of the pressure on the interior of the pre-finished product, further improve the mechanical properties of the prepared proppant, and reduce the breakage rate of the proppant when subjected to external force.

[0028] In summary, this application has the following beneficial effects:

[0029] The present application prepares a reinforcing agent by compounding manganese dioxide, Nd2O3 and carbon nanotubes, and adds the reinforcing agent to the main material. During the calcination process of the main material, the mullite crystal phase and the magnesium aluminum spinel crystal phase are promoted to form, so that the internal structure of the proppant is dense and has good mechanical properties; then, the adhesive resin is coated on the surface of the pre-finished product. After the adhesive resin is cured, the adhesive resin is used to absorb and buffer the pressure on the proppant, thereby reducing the pressure on the pre-finished product inside the adhesive resin, so that the prepared proppant has a better supporting effect when used and is not easy to break. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to Examples and Comparative Examples;

[0031] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available.

[0032] Example

[0033] Example 1

[0034] The preparation method of the lightweight high-strength fracturing proppant in this embodiment mainly includes the following steps:

[0035] S1: Take a mixing barrel, put the main material, reinforcing agent and water into the mixing barrel and mix them to prepare raw material balls, the particle size of the raw material balls is 50 mesh; put the raw material balls into a sintering furnace and sinter for 2 hours, the sintering temperature is set to 1350°C, to prepare pre-finished products; the main material used is composed of coal gangue and bauxite in a mass ratio of 1:7; the mass ratio of the main material, reinforcing agent and water is 7:1:5; the reinforcing agent used is composed of manganese dioxide, Nd2O3 and carbon nanotubes in a mass ratio of 2:1:3;

[0036] S2: Take a melting barrel, place the adhesive resin in the melting barrel, heat the melting barrel to melt the adhesive resin, and prepare a molten material; place the pre-finished product prepared in step S1 in the molten material so that its surface is covered with the adhesive resin, take it out, solidify it, and cool it; the adhesive resin used is composed of phenolic resin and polyphenol type glycidyl ether epoxy resin in a mass ratio of 2:5; the polyphenol type glycidyl ether epoxy resin used in this application is triphenol methane triglycidyl ether epoxy resin.

[0037] The lightweight high-strength fracturing proppant in the present application is prepared by a method for preparing a lightweight high-strength fracturing proppant.

[0038] Example 2

[0039] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 1 in that the reinforcing agent used in step S1 is composed of manganese dioxide, Nd2O3 and carbon nanotubes in a mass ratio of 3:3:4.

[0040] Example 3

[0041] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 1 in that the reinforcing agent used in step S1 is composed of manganese dioxide, Nd2O3 and carbon nanotubes in a mass ratio of 2.5:2:3.5.

[0042] Example 4

[0043] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 3 in that the adhesive resin used in step S2 is composed of phenolic resin and polyphenol-type glycidyl ether epoxy resin in a mass ratio of 3:3.

[0044] Example 5

[0045] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 3 in that the adhesive resin used in step S2 is composed of phenolic resin and polyphenol type glycidyl ether epoxy resin in a mass ratio of 2.5:4.

[0046] Example 6

[0047] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 3 in that the adhesive resin used in step S2 is phenolic resin.

[0048] Example 7

[0049] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 3 in that the adhesive resin used in step S2 is a polyphenol-type glycidyl ether epoxy resin.

[0050] Example 8

[0051] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 5 in that the temperature for sintering the raw balls in step S1 is 1500°C.

[0052] Example 9

[0053] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 5 in that the temperature for sintering the raw balls in step S1 is 1420°C.

[0054] Example 10

[0055] The preparation method of the lightweight high-strength fracturing proppant in this embodiment differs from that in Example 9 in that the carbon nanotubes in the reinforcing agent are immersed in an acid solution for 10 minutes before use, then removed and immersed in a hydrogen peroxide solution for 10 minutes, and then removed and dried; the concentration of hydrogen peroxide in the hydrogen peroxide solution used is 20%; and the acid solution used is a sulfuric acid solution with a molar concentration of 10 mol / L.

[0056] Example 11

[0057] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 10 in that when the carbon nanotubes are placed in the acid solution for immersion, the acid solution is simultaneously subjected to ultrasonic treatment at a power of 500W.

[0058] Example 12

[0059] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 11 in that when the adhesive resin is heated and melted in step S2, nut shell powder is also added to the adhesive resin, and the mass ratio of the nut shell powder to the adhesive resin is 1:5; the nut shell powder used is composed of walnut shells and cashew shells in a mass ratio of 1:1.

[0060] Example 13

[0061] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 12 in that the mass ratio of coal gangue to bauxite in the main material used in step S1 is 3:1.

[0062] Example 14

[0063] The method for preparing the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 12 in that the mass ratio of coal gangue to bauxite in the main material used in step S11 is 2:5.

[0064] Example 15

[0065] The preparation method of the lightweight high-strength fracturing proppant in this embodiment differs from that in Example 14 in that the polyphenol-type glycidyl ether epoxy resin used in this embodiment is modified before use to prepare a modified epoxy resin. The preparation method of the modified epoxy resin includes the following steps:

[0066] S11: Take a mixing barrel, add a polyphenol type glycidyl ether epoxy resin and a bismaleimide resin into the mixing barrel and mix them evenly to prepare a mixture; the mass ratio of the polyphenol type glycidyl ether epoxy resin to the bismaleimide resin is 1:10;

[0067] S12: heating the mixed material obtained in step S11 to melt it, and then extruding and granulating it.

[0068] Comparative Example

[0069] Comparative Example 1

[0070] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 1 in that the reinforcing agent in the raw materials used is manganese dioxide.

[0071] Comparative Example 2

[0072] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 1 in that the reinforcing agent in the raw materials used is Nd2O3.

[0073] Comparative Example 3

[0074] The preparation method of the lightweight high-strength fracturing proppant in this embodiment is different from that in Example 1 in that the reinforcing agent in the raw materials used is carbon nanotubes.

[0075] Detection method

[0076] Lightweight high-strength fracturing proppants were prepared as experimental samples according to the preparation methods of Examples 1-15 and Comparative Examples 1-3. 1000 proppants were taken for each test. The proppants were crushed under a closure pressure of 86 MPa according to the experimental method in SY / T5108-1997. The crushing rate of the proppant in each experimental sample was calculated and the data were recorded to obtain Table 1:

[0077] Table 1 Crushing rate of lightweight high-strength fracturing proppants prepared in Examples 1-15 and Comparative Examples 1-3

[0078]

[0079]

[0080] Combining Examples 1-3, Comparative Examples 1-3 and Table 1, it can be seen that by combining manganese dioxide, Nd2O3 and carbon nanotubes, manganese dioxide nucleates in the proppant, accelerates the growth and formation of mullite crystal phase and magnesia-aluminum spinel, and promotes the formation of the internal crystalline structure of the proppant; adding Nd2O3 can promote the bonding of the internal grain boundaries of the proppant to be more dense, and reduce the number of pores in the proppant; carbon nanotubes can play a good filling role in the pores in the proppant, and at the same time, carbon nanotubes can also connect the crystalline phase in the proppant, further improve the mechanical properties of the prepared proppant, and reduce the breakage rate of the proppant; by comparison with Comparative Examples 1-3, it can be seen that manganese dioxide, Nd2O3 and carbon nanotubes have a synergistic effect, which can further improve the mechanical properties of the prepared proppant and reduce the breakage rate of the prepared proppant;

[0081] Combining Examples 4-11 and Table 1, it can be seen that when the adhesive resin is composed of a phenolic resin and a polyphenol-type glycidyl ether epoxy resin in a mass ratio of 2.5:4, the epoxy groups and hydroxyl groups in the polyphenol-type glycidyl ether epoxy resin allow the polyphenol-type glycidyl ether epoxy resin to undergo polycondensation and cross-linking with the phenolic resin, so that the prepared adhesive resin has good cohesion and adhesion after curing, and also has good rigidity. After the adhesive resin is coated on the surface of the pre-finished product, the adhesive resin has good elasticity and can protect the pre-finished product and cushion the pressure applied to the pre-finished product, thereby reducing the crushing rate of the pre-finished product. Compared with Examples 6-7, where a phenolic resin or a polyphenol-type glycidyl ether epoxy resin is used alone as the adhesive resin, it can be seen from the data in Table 1 that the combined use of the polyphenol-type glycidyl ether epoxy resin and the phenolic resin can significantly improve the mechanical properties of the prepared proppant, thereby reducing the crushing rate of the proppant.

[0082] At the same time, the sintering temperature of the pre-finished product is set. Compared with the data in Table 1, when the sintering temperature is 1420°C, the mullite crystal phase structure inside the proppant continues to grow and coarsen, and a liquid phase is formed inside the proppant during the calcination process, filling the mullite crystal phase and the magnesium aluminum spinel, making the interior of the prepared proppant more dense and stable, and reducing the breakage rate of the proppant experiment; and by pre-treating the carbon nanotubes through impregnation with acid solution and hydrogen peroxide solution, more active -OH or -COOH functional groups can be generated on the surface of the carbon nanotubes, so that the wrapping performance of the adhesive resin on the surface of the pre-finished product is improved, and the mechanical properties of the prepared proppant are further improved;

[0083] In combination with Examples 12-15 and Table 1, it can be seen that by adding nutshell powder to the adhesive resin, the nutshell powder can react with the phenolic resin to form a tighter cross-linked structure with the adhesive resin, and the adhesive resin is filled so that the nutshell and the adhesive resin are jointly covered on the surface of the pre-finished product. The mechanical properties of the prepared proppant are better and the breakage rate is reduced; in combination with Example 15, it can be seen that by mixing the polyphenol type glycidyl ether epoxy resin with the bismaleimide resin and modifying the polyphenol type glycidyl ether epoxy resin, the mechanical properties and toughness of the polyphenol type glycidyl ether epoxy resin are improved, so that the prepared proppant is less likely to break when subjected to external force, and the breakage rate is reduced.

[0084] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing a lightweight high-strength fracturing proppant, characterized in that: The main steps are as follows: S1: Mix the main material, the reinforcing agent and water to prepare raw material balls, and sinter the raw material balls to prepare pre-finished products; the main material is composed of coal gangue and bauxite; the main material is composed of coal gangue and bauxite in a mass ratio of (1-3):(1-7); the reinforcing agent is composed of manganese dioxide, Nd2O3 and carbon nanotubes in a mass ratio of (2-3):(1-3):(3-4); S2: heating and melting the adhesive resin, coating the surface of the pre-finished product obtained in step S1, and drying the pre-finished product.

2. The method for preparing a lightweight high-strength fracturing proppant according to claim 1, characterized in that: The adhesive resin is composed of phenolic resin and polyphenol type glycidyl ether epoxy resin in a mass ratio of (2-3):(3-5).

3. The method for preparing a lightweight high-strength fracturing proppant according to claim 1, characterized in that: The sintering temperature in step S1 is 1350-1500°C.

4. The method for preparing a lightweight high-strength fracturing proppant according to claim 1, characterized in that: The carbon nanotubes in the reinforcing agent are pretreated before use, and the pretreatment comprises the following steps: placing the carbon nanotubes in an acid solution for immersion, then taking them out and placing them in a hydrogen peroxide solution for immersion, and then taking them out and drying them.

5. The method for preparing a lightweight high-strength fracturing proppant according to claim 4, characterized in that: When the carbon nanotubes are immersed in the acid solution, the acid solution is ultrasonically treated at the same time.

6. The method for preparing a lightweight high-strength fracturing proppant according to claim 2, characterized in that: The polyphenol type glycidyl ether epoxy resin is modified before use to prepare a modified epoxy resin: the preparation method of the modified epoxy resin comprises the following steps: S11: mixing a polyphenol type glycidyl ether epoxy resin and a bismaleimide resin to prepare a mixture; S12: Melt the mixed material obtained in step S11, and extrude and granulate it.

7. The method for preparing a lightweight high-strength fracturing proppant according to claim 1, characterized in that: When the adhesive resin is heated and melted in step S2, nut shell powder is also added to the adhesive resin.

8. A light high-strength fracturing proppant prepared according to the method for preparing a light high-strength fracturing proppant according to claim 1.

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