Resin fracturing propping agent and preparation method thereof

Abstract

The invention relates to a resin fracturing propping agent and a preparation method thereof. The resin fracturing propping agent comprises an inorganic core and an organic coating layer coating the inorganic core, wherein the inorganic core comprises a filler, and the filler is chemically modified by using one or more of a silane coupling agent, phosphoric acid or phosphate esters; and the organic coating layer comprises curable resin and is formed by curing at the periphery of the inorganic core. In the invention, the resin fracturing propping agent meets the environmental requirements of deep and high-temperature oil and gas well strata, reduces the pumping resistance in the fracturing process, improves the sand-carrying efficiency, effectively maintains the fracture conductivity, and obviously improves the fracturing efficiency and recovery efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, specifically to a resin fracturing proppant and its preparation method. Background Technology

[0002] In shale oil and gas development, horizontal well volumetric fracturing technology is the main technical measure for enhancing the production of shale oil and gas reservoirs. Among them, proppant, as a key material in hydraulic fracturing construction, can support the fracturing fractures, keep the oil and gas channels unobstructed to improve the conductivity and increase the production of oil and gas. Its performance has a significant impact on the production of shale oil and gas.

[0003] Conventional quartz sand and ceramsite proppants have low strength and high density, which can easily lead to problems such as sand blockage, equipment damage, and residue damage during fracturing operations. Slickwater fracturing fluid is the most commonly used fracturing fluid system in shale oil and gas fracturing development. It is low in cost and can easily form a complex fracture network with the formation fracture network to improve conductivity. However, its low viscosity results in poor sand carrying and suspension performance. High-density conventional fracturing proppants settle rapidly in slickwater fracturing fluid systems, have poor applicability, and cannot effectively support the distal and upper ends of fractures, leading to fracture closure and thus affecting oil and gas production.

[0004] Low-density fracturing proppants can avoid the settling problem of conventional fracturing proppants in slickwater fracturing fluid, thus improving fracture support. Currently, low-density fracturing proppants are mainly prepared by resin coating of nut shells or ceramsite. Cabo Fibre's lightweight ceramsite proppant has a density of 2.0 g∙cm³. -3 Compared to conventional quartz sand, its density is reduced by 25%. The apparent specific gravity of the lightweight proppant disclosed in CN108495910B is approximately 1.5 g / cm³. 3 The composite proppant disclosed in CN117264624A has an apparent density of less than 2.2 g / cm³. 3 The density of the aforementioned proppant is lower than that of quartz sand and ceramsite, but the reduction is small, and there is still a risk of sedimentation in slickwater fracturing fluid systems. CN111088028B discloses an ultra-low density proppant with an apparent density of less than 2.0 g / cm³. 3 However, its compressive strength is only 30 MPa, and its breakage rate is nearly 9%. Baker Huges has developed a low-density polymer microsphere support with an apparent density as low as 1.08 g / cm³. 3 However, it is prone to deformation under high closure pressure in the formation, which leads to a significant reduction in its conductivity.

[0005] Existing low-density fracturing proppants have limited capacity to reduce density. Furthermore, under high-temperature and high-pressure reservoir conditions, issues such as low material strength, formation stress concentration, chemical corrosion, temperature effects, and improper particle size design can lead to breakage and deformation under formation pressure, resulting in fracturing fracture closure. In soft formations, proppant embedding and fine particles from the broken proppant can clog pores, reducing formation conductivity and affecting oil production efficiency.

[0006] Therefore, there is an urgent need to provide a new type of resin fracturing proppant with high heat resistance, high strength, and low density. Summary of the Invention

[0007] The purpose of the exemplary embodiments of this invention is to address the shortcomings of the prior art. This invention achieves a strong interfacial bond between the "inorganic core (rigid core)" and the "organic coating layer (tough resin)" by chemically modifying and then coating the inorganic (rigid) core, thus providing a high-heat-resistant, high-strength, and low-density resin fracturing proppant.

[0008] On one hand, the present invention provides a resin fracturing proppant, comprising an inorganic core and an organic coating layer covering the inorganic core;

[0009] The inorganic core includes a filler material, which is selected from silane coupling agents and phosphoric acid. Or chemically modified with one or more of the following phosphate esters;

[0010] The organic coating layer comprises a curable resin, which is cured and formed on the periphery of the inorganic core.

[0011] In one embodiment of the present invention, the filler is selected from one or more of porous silica, hollow silica, silicon carbide, and porous alumina.

[0012] In one embodiment of the present invention, the curable resin includes one or more selected from phenolic resin, epoxy resin, amino resin, unsaturated polyester resin and silicone ether resin.

[0013] In one embodiment of the present invention, the resin fracturing proppant has a compressive strength of 86-103 MPa, a glass transition temperature of 130-200°C, and a density of 1.0-1.5 g / cm³. 3 The breakage rate is less than 4%.

[0014] On the other hand, the present invention provides a method for preparing the resin fracturing proppant, comprising:

[0015] (1) The filler is chemically modified with a chemical modifier, wherein the chemical modifier is selected from one or more of silane coupling agents, phosphoric acid or phosphate esters;

[0016] (2) A mixture is obtained by mixing chemically modified fillers, curable resins, curing agents, and optional accelerators;

[0017] (3) Allow the mixture to undergo a curing reaction to form a resin fracturing proppant.

[0018] In one embodiment of the present invention, the filler is selected from one or more of porous silica, hollow silica, silicon carbide, and porous alumina; the curable resin includes one or more of phenolic resin, epoxy resin, amino resin, unsaturated polyester resin, and silicone ether resin.

[0019] In one embodiment of the present invention, the curing agent is selected from one or more of acid anhydrides and amines; the accelerator is selected from one or more of substituted urea, amines, boron trifluoride complexes, imidazoles, and imidazole salts.

[0020] In one embodiment of the present invention, the mass ratio of the curable resin, filler, curing agent and accelerator is 100:(1-50):(10-80):(0-10).

[0021] In one embodiment of the present invention, in step (3), the mixture is carried out in a reaction carrier selected from one or more of silicone oil, mineral oil, fluorinated polyether, and paraffin oil.

[0022] In one embodiment of the present invention, step (3) is performed at a curing temperature of 100-200°C for 0.5-10 hours.

[0023] In this invention, the resin-based fracturing proppant combines high strength with low brittleness, and its thermal stability is improved through a stepped temperature curing process. Simultaneously, the tough resin shell and lightweight rigid filler synergistically reduce the overall density of the product. This fracturing proppant exhibits a compressive strength of 86-103 MPa, a glass transition temperature of 130-200℃, a density of 1.0-1.5 g / cm³, and a breakage rate of <4%.

[0024] Other features and aspects will become clear from the following detailed description and the claims. Detailed Implementation

[0025] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0026] In this document, the term “about” used to modify, for example, the amount, concentration, process temperature, process time, flow rate, and similar values ​​and ranges of an ingredient in a composition / complex, or the scale and similar values ​​and ranges of a component, refers to possible changes in numerical quantities, such as those arising from routine measurements and operations used in the manufacture or use of formulations for preparing materials, compositions, complexes, concentrates, component parts, articles; accidental errors in these processes; differences in the purity or composition of the manufacturing, source, or starting materials used to carry out the method; and similar factors.

[0027] In this document, when a numerical range such as 5-25 is given, this means at least 5 or not less than 5 and separately and independently not greater than or less than 25. In some embodiments, such a range may be independently defined as not less than 5 and separately and independently not greater than 25. Values ​​having such a range, such as 10, -15, or 10-20, also include the lower and upper limits of the range separately and independently in the same manner.

[0028] As used herein, unless otherwise specified, "mass %" or "mass percentage" of a component is based on the total weight of the composition or article containing that component. Terms such as "comprising" or "including" mean that the elements or articles preceding "comprising" or "including" encompass the elements or articles listed following "comprising" or "including" and their equivalents, and do not exclude other elements or articles.

[0029] Resin fracturing proppant

[0030] In this invention, the inorganic core serves as the "skeleton structure" of the resin fracturing proppant, primarily bearing the compressive strength and abrasion resistance under formation closure pressure, while also providing an adhesion substrate for the outer resin coating. Typically, the inorganic core should possess high compressive strength (usually ≥52 MPa, with a breakage rate ≤10% under closure pressure), low abrasion rate, and strong chemical stability (resistant to acids and alkalis, and formation fluid corrosion). The inorganic core is typically granular, mostly spherical or near-spherical; the particle size distribution is concentrated, commonly 20-70 mesh; and the particle surface has a certain roughness to facilitate bonding with the resin. In some embodiments, the inorganic core typically employs a lightweight rigid filler. In some embodiments, the lightweight rigid filler is selected from one or more of porous silica, hollow silica, silicon carbide, and porous alumina. In some embodiments, the particle size D90 of the rigid filler can range from 1 micrometer to 100 micrometers, 5 micrometers to 90 micrometers, 10 micrometers to 80 micrometers, 20 micrometers to 70 micrometers, or 30 micrometers to 60 micrometers.

[0031] This invention uses the aforementioned inorganic rigid core as a load-bearing foundation, with an outer layer of organic toughening resin to form a composite structure. The inorganic core is responsible for "supporting the fracture," providing compressive strength and structural stability. The coating layer is responsible for "protecting the core and optimizing performance," compensating for the brittleness of inorganic materials and improving compatibility with the formation and fracturing fluids. In one embodiment of this invention, the organic coating layer is formed by curing a curable resin. The curable resin includes one or more selected from phenolic resin, epoxy resin, amino resin, unsaturated polyester resin, and silicone ether resin.

[0032] To promote the bonding between the inorganic core and the organic coating layer, this invention chemically modifies the inorganic core using one or more selected from silane coupling agents, phosphoric acid (H3PO4), or phosphate esters. In some embodiments, the silane coupling agents include aminosilanes (e.g., KH-550 (γ-aminopropyltriethoxysilane), KH-792 (N-β-aminoethyl-γ-aminopropyltrimethoxysilane)), epoxysilanes (e.g., KH-560 (γ-glycidoxypropyltrimethoxysilane)), vinylsilanes (e.g., KH-151 (vinyltriethoxysilane), KH-570 (γ-methacryloyloxypropyltrimethoxysilane)), etc. In some embodiments, the chemical modifier may further include supplementary modifiers and / or auxiliary modifiers, wherein the supplementary modifiers include titanate coupling agents (e.g., isopropyl tristearate titanate (TTS), isopropyl tris(dioctylphosphoyloxy)titanate (TDOP)), and the auxiliary modifiers include γ-mercaptopropyltrimethoxysilane (KH-590), aluminate coupling agents (DL-411-A), etc.

[0033] In this invention, the compressive strength of the resin fracturing proppant is 86-103MPa, 90-100MPa or 93-97MPa, which is significantly higher than that of conventional film proppant (60-80MPa) and quartz sand (20-40MPa), and can meet the high closure pressure (>80MPa) requirements of deep oil and gas wells.

[0034] In this invention, the glass transition temperature of the resin fracturing proppant is 130-200℃, 140-190℃, 150-180℃ or 160-170℃, which is suitable for high-temperature formations and avoids performance degradation caused by phase change or softening.

[0035] In this invention, the density of the resin fracturing proppant is 1.0-1.5 g / cm³. 3 1.1-1.4 g / cm³ 3 Or 1.2-1.3 g / cm³ 3It is lower than that of conventional film proppant (1.5-1.7 g / cm³) and ceramsite (2.8-3.2 g / cm³), which can reduce pumping resistance, improve sand carrying efficiency, and maintain high strength.

[0036] In this invention, the breakage rate of the resin fracturing proppant is <4%, preferably <3%, more preferably <2%, and even more preferably <1%.

[0037] To form the composite structure of the inorganic core-organic coating layer described in this invention, methods commonly used in the art can be employed, such as dip coating / spray coating + in-situ curing. In some embodiments, the method for preparing the resin fracturing proppant of this invention includes:

[0038] (1) Mix inorganic filler, curable resin, curing agent and optional accelerator to obtain a mixture;

[0039] (2) Allow the mixture to undergo a curing reaction to form a resin fracturing proppant.

[0040] In some embodiments of the present invention, the method further includes:

[0041] (3) The inorganic filler is chemically modified with a chemical modifier, wherein the chemical modifier is selected from one or more of silane coupling agents, phosphoric acid or phosphate esters.

[0042] In some embodiments, the inorganic filler is selected from one or more of porous silica, hollow silica, silicon carbide, and porous alumina; the curable resin includes one or more of phenolic resin, epoxy resin, amino resin, unsaturated polyester resin, and silicone ether resin.

[0043] In some embodiments, the curing agent is selected from one or more of acid anhydrides (e.g., phthalic anhydride, maleic anhydride, methyltetrahydrophthalic anhydride) and amines (e.g., 4,4'-diaminodiphenylmethane, menthol diamine, ethylenediamine, m-phenylenediamine); the accelerator is selected from one or more of substituted ureas (e.g., N-p-chlorophenyl-N,N'-dimethylurea, N-(3-phenyl)-N,N'-dimethylurea, N-(3,4-dichlorophenyl)-N,N'-dimethylurea, N-(4-phenyl)-N,N'-dimethylurea), amines (e.g., benzyldimethylamine, triethanolamine, triethylamine, tetrabutylammonium chloride), boron trifluoride complexes, imidazoles (e.g., 2-ethyl-4-methylimidazolium), and imidazole salts.

[0044] In some embodiments, the mass ratio of the curable resin, filler, curing agent and accelerator is 100:(1-50):(10-80):(0-10), 100:(5-40):(15-70):(1-10), 100:(10-30):(20-60):(3-8) or 100:(15-25):(30-50):(4-6).

[0045] In some embodiments, the curing reaction is carried out in a reaction carrier selected from one or more of silicone oil, mineral oil, fluorinated polyether, and paraffin oil.

[0046] In some embodiments, the curing reaction is carried out at a curing temperature of 100-200°C, 120-180°C, or 140-160°C for 0.5-10 hours, 1-8 hours, or 2-6 hours.

[0047] In some embodiments, the curing reaction can be carried out under stepped temperature increases to improve the thermal stability of the resin fracturing proppant. In this invention, the stepped temperature increases include a phased heating process of "(optional) low-temperature preheating → medium-temperature gelation → high-temperature curing → (optional) post-treatment with heat preservation," precisely controlling the curing reaction rhythm. The stepped temperature increases can be adjusted according to the resin type; for example, the curing temperature of phenolic resin can be appropriately higher, while that of polyurethane resin can be appropriately lower. In some embodiments, low-temperature preheating can be carried out at 50-80°C for 30-60 minutes to remove moisture and low-boiling-point solvents from the resin and prevent bubble formation at high temperatures. During this stage, no significant cross-linking occurs, maintaining fluidity and uniformly wetting the inorganic core surface. In the medium-temperature gelation (e.g., 90-120°C, heat preservation for 60-90 minutes), initial cross-linking of the resin is initiated, forming a three-dimensional network gel structure and fixing the coating morphology. At this point, the resin changes from a liquid to a semi-solid state, no longer flowing, and initially combines with the core surface. High-temperature curing (e.g., 130-180℃, holding for 90-150 minutes) promotes complete cross-linking reaction, improving the hardness, bonding strength, and temperature resistance of the coating layer. At this stage, the resin molecules are fully cross-linked, forming a dense and stable cured layer that is tightly bonded to the inorganic core through chemical bonds or physical adsorption. Finally, to prevent cracking of the coating layer due to a sudden temperature drop, a post-treatment of heat preservation (e.g., 100-120℃, holding for 30-60 minutes) can be performed to release internal stress. In this invention, the heating rate is controlled at 5-10℃ / minute per stage to avoid excessively rapid heating that could cause localized overheating. Simultaneously, the temperature deviation is ≤±5℃ to ensure consistent curing effect for all proppant particles. In some embodiments, after heat preservation, the proppant is naturally cooled to room temperature, then filtered (vacuum), washed, and dried to obtain the finished proppant.

[0048] Example

[0049] To make the technical solution and effects of the present invention clearer, the technical solution of the present invention will be further described below in conjunction with some specific embodiments. The described embodiments are for further illustrating the present invention and should not be construed as limiting the scope of protection of the present invention.

[0050] 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.

[0051] Example 1: Preparation of resin fracturing proppant ZCJ-1

[0052] 1) Weigh the raw materials: 100g of bisphenol A epoxy resin E-20, and rigid lightweight filler (KH570 modified hollow SiO2, density 0.4g / cm³). 3 1g of a particle size D90=10μm, 10g of a curing agent (maleic anhydride), and 1g of an accelerator (triethylamine) are mixed evenly at 50℃ to obtain a mixture.

[0053] 2) Using mechanical stirring, the mixture was added to 3000g of silicone oil at 200℃. After curing for 0.5 hours, the product was vacuum filtered, washed, and dried to obtain fracturing proppant ZCJ-1.

[0054] Example 2: Preparation of resin fracturing proppant ZCJ-2

[0055] Example 1 was repeated, except that the mass of KH570 modified hollow SiO2 added was 50 g, the amount of hollow SiO2 added was about 45% of the raw material mass, and the mass of silicone oil was 4000 g.

[0056] Example 3: Preparation of resin fracturing proppant ZCJ-3

[0057] Example 1 was repeated, except that the rigid lightweight filler was silicon carbide (density 3.2 g / cm³). 3 (Particle size D90=15μm), its mass is 1g.

[0058] Example 4: Preparation of resin fracturing proppant ZCJ-4

[0059] Example 1 was repeated, except that the rigid lightweight filler was porous alumina (density 2.0 g / cm³). 3 The particle size (D90=30μm) is 10g.

[0060] Example 5: Preparation of resin fracturing proppant ZCJ-5

[0061] Example 1 was repeated, except that the rigid lightweight filler modifier was KH-151 (vinylsilane).

[0062] Example 6: Preparation of resin fracturing proppant ZCJ-6

[0063] Example 3 was repeated, except that the rigid lightweight filler modifier was phosphoric acid.

[0064] Example 7: Preparation of resin fracturing proppant ZCJ-7

[0065] Example 3 was repeated, except that 80g of maleic anhydride was added as curing agent and 3400g of silicone oil was added.

[0066] Example 8: Preparation of resin fracturing proppant ZCJ-8

[0067] Example 3 was repeated, except that the curing agent added was m-phenylenediamine and the mass of silicone oil added was 3500g.

[0068] Example 9: Preparation of resin fracturing proppant ZCJ-9

[0069] Example 3 was repeated, except that the accelerator was 2-ethyl-4-methylimidazole and the mass of silicone oil added was 3700g.

[0070] Example 10: Preparation of resin fracturing proppant ZCJ-10

[0071] Example 3 was repeated, except that the accelerator was boron trifluoride complex and the mass of silicone oil added was 3500g.

[0072] Example 11: Preparation of resin fracturing proppant ZCJ-11

[0073] Example 3 was repeated, except that the mass of the accelerator triethylamine added was 10g, and the mass of the silicone oil added was 3600g.

[0074] Example 12: Preparation of resin fracturing proppant ZCJ-12

[0075] Example 3 was repeated, except that the accelerator was N-p-chlorophenyl-N,N'-dimethylurea and the mass of silicone oil added was 3200g.

[0076] Example 13: Preparation of resin fracturing proppant ZCJ-13

[0077] Example 3 was repeated, except that the curing temperature was 110°C.

[0078] Example 14: Preparation of resin fracturing proppant ZCJ-14

[0079] Repeat Example 3, except that the curing time is 10 hours.

[0080] Example 15: Preparation of resin fracturing proppant ZCJ-15

[0081] Example 3 was repeated, except that the curing temperature and curing time were 150°C for 3 hours and then the temperature was raised to 200°C for 1 hour.

[0082] Comparative Example 1: Preparation of resin fracturing proppant ZCJ(D)-1

[0083] Repeat Example 3, except that no rigid lightweight filler is added.

[0084] Comparative Example 2: Preparation of resin fracturing proppant ZCJ(D)-2

[0085] Example 3 was repeated, except that: the rigid lightweight filler added was silicon carbide, with a mass of 60g, which was about 54% of the mass of the raw material.

[0086] Comparative Example 3: Preparation of resin fracturing proppant ZCJ(D)-3

[0087] Repeat Example 1, except that no modifier is used.

[0088] Comparative Example 4: Preparation of resin fracturing proppant ZCJ(D)-4

[0089] Example 3 was repeated, except that the curing temperature was 80°C.

[0090] Comparative Example 5: Preparation of resin fracturing proppant ZCJ(D)-5

[0091] Repeat Example 3, except that the curing time is 0.2 hours.

[0092] The glass transition temperature, apparent density, and fracture rate of the fracturing proppant prepared in Examples 1-15 and Comparative Examples 1-5 were analyzed. The analysis results are detailed in Table 1 below.

[0093] Table 1: Performance of fracturing proppant in Examples 1-15 and Comparative Examples 1-5

[0094]

[0095] As can be seen from Examples 1-2, adding hollow silica as a rigid lightweight filler can reduce the proppant density to 1.10 g / cm³. 3 Furthermore, increasing the amount of rigid filler increases the glass transition temperature of the product while slightly reducing the breakage rate. Experiments in Examples 3-15 show that by adjusting the type and proportion of raw materials, rigid lightweight fillers, curing agents, and accelerators, products with a glass transition temperature of 130-200℃, a breakage rate of <4%, and an apparent density of 1.0-1.5 g / cm³ can be prepared. 3High-strength, low-density resin fracturing proppant products with a compressive strength of 86-103MPa.

[0096] The experiments in Comparative Examples 1-5 show that without the addition of rigid lightweight fillers, the glass transition temperature of the fracturing proppant is significantly reduced. However, if the amount of rigid filler added is too high, the resin-to-proppant encapsulation is poor, the glass transition temperature of the product decreases instead of increasing, and the product density increases significantly, resulting in lower compressive strength. Too low a curing temperature, too short a curing time, or the absence of additives will lead to a slow curing rate of the proppant, resulting in a significant decrease in glass transition temperature and compressive strength, and a significant increase in breakage rate.

[0097] Measurement Standards

[0098] 1. Glass transition temperature

[0099] The glass transition temperature is determined using the differential scanning calorimetry (DSC) method, as per ASTM E1356-25. The glass transition temperature is determined by measuring the difference in thermal effects between the sample and the reference material during heating or cooling. When a material undergoes a glass transition, its specific heat capacity changes significantly, causing a baseline shift in the DSC curve. The glass transition temperature is determined by the baseline shift or the maximum slope tangent method.

[0100] 2. Apparent density

[0101] The apparent density was determined by referring to SY / T 5108-2014 "Test Method for Performance of Proppants for Hydraulic Fracturing and Gravel Packing Operations" and the specific gravity bottle method and the gas displacement method.

[0102] 3. Compressive strength

[0103] The compressive strength is measured according to GB / T 29170-2012: "Test Method for Performance of Fracturing Proppants in Petroleum and Natural Gas Industry". A pressure testing machine is typically used. The proppant sample is placed in the machine, and pressure is gradually applied. The breaking force of each particle is recorded. By statistically analyzing the breaking forces of a certain number of samples (e.g., 100 particles), a Weibull distribution curve is plotted, and the characteristic strength (F0) and modulus (m) are calculated to characterize the compressive strength of the proppant.

[0104] 4. Breakage rate

[0105] The breakage rate was measured according to GB / T 29170-2012: "Test Method for Performance of Fracturing Proppants in Petroleum and Natural Gas Industry". The sieving method was used; the fracturing sand sample was placed in a pressure testing machine, a specified pressure was applied, and the broken particles were separated through a standard sieve. The percentage of broken particles to the total sample mass was calculated, which is the breakage rate.

[0106] Although the invention has been described in conjunction with specific embodiments, those skilled in the art will understand that many modifications and variations can be made to the invention. Therefore, it is to be appreciated that the claims are intended to cover all such modifications and variations that fall within the true concept and scope of the invention.

Claims

1. A resin fracturing proppant comprising an inorganic core and an organic coating layer coating the inorganic core; wherein The inorganic core comprises a filler chemically modified with one or more selected from the group consisting of silane coupling agents, phosphoric acids or phosphoric acid esters; the organic coating layer comprises a curable resin, which is cured to form outside the inorganic core.

2. The resin frac proppant of claim 1, wherein, The filler is selected from one or more of porous silica, hollow silica, silicon carbide, porous alumina.

3. The resin frac proppant of claim 1, wherein, The curable resin comprises one or more selected from phenolic resin, epoxy resin, amino resin, unsaturated polyester resin and siloxane resin.

4. The resin frac proppant of claim 1, wherein, The resin fracturing proppant has a compressive strength of 86-103 MPa, a glass transition temperature of 130-200 DEG C, a density of 1.0-1.5 g / cm 3 , and a crushing rate of <4%.

5. A method for preparing the resin fracturing proppant of any one of claims 1-4, comprising: (1) chemically modifying the filler with a chemical modifier selected from one or more of silane coupling agents, phosphoric acid or phosphonates; (2) mixing the chemically modified filler, the curable resin, the curing agent and the optional accelerator to obtain a mixture; (3) allowing the mixture to undergo a curing reaction to form the resin fracturing proppant.

6. The method of claim 5, wherein, The filler is selected from one or more of porous silica, hollow silica, silicon carbide, porous alumina; the curable resin comprises one or more selected from phenolic resin, epoxy resin, amino resin, unsaturated polyester resin and siloxane resin.

7. The method of claim 5, wherein, The curing agent is selected from one or more of acid anhydride and amine; the accelerator is selected from one or more of substituted urea, amine, boron trifluoride complex, imidazole and imidazole salt.

8. The method of claim 5, wherein, The mass ratio of the curable resin, the filler, the curing agent and the accelerator is 100:(1-50):(10-80):(0-10).

9. The method of claim 5, wherein, In step (3), the mixture is allowed to react in a reaction carrier selected from one or more of silicone oil, mineral oil, fluorinated polyether and paraffin oil.

10. The method of claim 5, wherein, Step (3) is carried out at a curing temperature of 100-200 °C for 0.5-10 hours.

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