Fracturing sand control fluid capable of automatically generating propping agent as well as preparation method and application of fracturing sand control fluid

Abstract

The invention discloses fracturing sand control fluid capable of automatically generating a propping agent. The fracturing sand control fluid is prepared from the following components: 10-25% of epoxy resin, 1-10% of a curing agent, 1-3% of a plasticizer, 0.5-10% of nanoparticles and the balance of a modified polymer aqueous solution with the mass concentration of 0.05-0.3%. The invention also discloses a preparation method of the fracturing sand control fluid capable of automatically generating the proppant. The preparation method comprises the following steps: (1) adding a proper amount of modified polymer into a proper amount of water to obtain a modified polymer aqueous solution with the concentration of 0.05-0.3% and the formula amount; (2) mixing and stirring the nano-particles, the epoxy resin and the plasticizer according to the formula ratio, then adding the curing agent according to the formula ratio, and uniformly stirring to obtain a mixture; and (3) adding the mixture obtained in the step (2) into the modified polymer aqueous solution obtained in the step (1), and uniformly stirring. The invention also discloses an application of the fracturing sand control fluid capable of automatically generating the propping agent as the fracturing sand control fluid in oil exploitation.

Description

Technical Field

[0001] The present invention belongs to the field of oil exploitation, and particularly relates to a fracturing sand control fluid capable of self-generating proppants, a preparation method thereof, and an application thereof. Background Art

[0002] Fracturing sand control forms a typical bilinear flow pattern due to the existence of fractures. Fracturing sand control is achieved by high-pressure pumping proppants into the oil reservoir to create microfractures in the near-wellbore area of the oil well, squeezing the proppants into the fractures and the formation void zone, and forming an artificial sand filtration barrier with a certain thickness - an artificial sand bridge in the oil reservoir, so as to achieve the purpose of sand control in the oil well by relying on the sand bridge. For example, Chinese Patent Application CN107461182A discloses a layered fracturing sand control method, which includes the following steps: dividing the oil reservoir into a first permeability oil reservoir and a second permeability oil reservoir; plugging the first permeability oil reservoir and conducting fracturing sand control on the second permeability oil reservoir; after the fracturing sand control of the second permeability oil reservoir is completed, unplugging the first permeability oil reservoir and conducting fracturing sand control on the first permeability oil reservoir.

[0003] Fracturing sand control forms microfracture chains in the formation, and artificial proppants form high-flow channels in the fractures, thereby changing the flow state in the oil reservoir, changing the original centripetal radial flow of crude oil to horizontal flow towards the fractures, improving the flow conditions, reducing the sand interception ability of the oil flow. At the same time, due to the proppants injected under high pressure changing the stress state of the formation sand, the formation sand is not easily transported towards the wellbore. In addition, high-pressure artificial wells can effectively make up for the formation voids, form a dense high-permeability zone within a certain range of the wellbore, reduce the production pressure difference, decrease the fluid velocity around the wellbore, and relieve formation sand production. Since the displacement of the sand-carrying fluid during fracturing sand control construction is high and the flow velocity is large, it can also remove the plugging in the near-wellbore area and has a good effect of removing plugging and increasing production. Chinese Patent Application CN104449625A discloses an oil and gas field fracturing type sand control fluid and a construction method thereof, belonging to the technical field of oil and gas drilling and production in oil and gas fields; the oil and gas field fracturing type sand control fluid includes a fracturing fluid and ceramsite with unequal particle sizes, and the particle size distribution range of the ceramsite is 20 - 140 mesh; the oil and gas field fracturing type sand control fluid of the present invention enters the sand-producing formation with ceramsite in different proportions and specifications, tightly accumulates to form a certain plugging layer, and the clean fracturing fluid returns to the ground under the action of the wellbore environment or a breaker, and ceramsite with different particle size distributions remains in the formation to form a filter layer with good stability and filtration performance, so as to achieve the effect of sand control. However, the above-mentioned ceramsite needs to be configured on-site on the ground of the injection well before injection, and the whole process is relatively cumbersome.

[0004] Based on this, a proppant-free fracturing sand control fluid has emerged, which can simplify the gravel packing and sand addition process. Acidizing is a method for increasing oil and gas production without proppants, especially for carbonate formations, but it has limitations such as short action distance and serious acid corrosion problems. For example, US Patent Application US3366178A mentions forming proppants in-situ in the formation, which uses a liquid-curing material containing a partially dispersed removable component. When the liquid cures, the removable part of the material is removed to form a porous solid. However, the disadvantage of this technology is the contradiction between bearing strength and conductivity: in order to increase the bearing strength, the porosity must be reduced. When obtaining high conductivity, a relatively large proportion of the material can be removed, resulting in a significant reduction in the strength of the material. Summary of the Invention

[0005] Object of the Invention: Aiming at the deficiencies of the above-mentioned prior art, the present invention discloses a proppant self-generating fracturing sand control fluid, its preparation method and application.

[0006] Technical Solution: A proppant self-generating fracturing sand control fluid is composed of the following components:

[0007] Epoxy resin 10 - 25%, curing agent 1 - 10%, plasticizer 1 - 3%, nano-particles 0.5 - 10%, and the balance is a modified polymer aqueous solution with a mass concentration of 0.05 - 0.3%.

[0008] Further, the epoxy resin is bisphenol A type epoxy resin.

[0009] Furthermore, the type of the bisphenol A type epoxy resin is one of E-55, E-51, E-44, E-42, E-35, E-20, E-12, E-06, E-03.

[0010] Further, the curing agent is one or several of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diethylaminopropylamine, diaminobenzene, 1,6-hexanediamine, diethylenetriamine.

[0011] Further, the plasticizer is one or several of bis(2-ethylhexyl) sebacate, di-n-octyl adipate, dibutyl sebacate, di-n-butyl adipate, dibutyl phthalate.

[0012] Further, the nano-particles are one or several of nano-silica, nano-graphite powder, nano-polyaniline.

[0013] Furthermore, the modified polymer is composed of structural unit A, structural unit B, structural unit C and structural unit D. Among them, structural unit A has the structure shown in formula (1), structural unit B has the structure shown in formula (2), structural unit C has the structure shown in formula (3), and structural unit D has the structure shown in formula (4). Based on the total mass of the modified polymer, the content of structural unit A is 5 wt% - 20 wt%, the content of structural unit B is 2 wt% - 10 wt%, the content of structural unit D is 2 wt% - 10 wt%, and the balance is structural unit C. The viscosity-average molecular weight of the modified polymer is greater than 18 million.

[0014]

[0015]

[0016] Even further, the viscosity-average molecular weight of the modified polymer is 20 million - 35 million.

[0017] The structural unit A is obtained by amide hydrolysis.

[0018] A preparation method of a fracturing sand control fluid with self-generated proppant as described in any one of the above items is as follows:

[0019] (1) Add an appropriate amount of the modified polymer to an appropriate amount of water to obtain an aqueous solution of the modified polymer with a concentration of 0.05 - 0.3% of the formulated amount.

[0020] (2) Mix and stir the formulated amount of nanoparticles, the formulated amount of epoxy resin, and the formulated amount of plasticizer, and then add the formulated amount of curing agent thereto and stir evenly to obtain a mixture.

[0021] (3) While stirring, add the mixture obtained in step (2) to the aqueous solution of the modified polymer obtained in step (1), and stir evenly to obtain a fracturing sand control fluid with self-generated proppant.

[0022] A fracturing sand control fluid with self-generated proppant is prepared by the preparation method described in any one of the above items.

[0023] The application of the fracturing sand control fluid with self-generated proppant as described in any one of the above items as a fracturing sand control fluid in oil exploitation.

[0024] During use, within 30 minutes after the fracturing sand control fluid with self-generated proppant is prepared, use a high-pressure pump to inject the fracturing sand control fluid with self-generated proppant into the ground.

[0025] Beneficial effects: A fracturing sand control fluid with self-generated proppant and its preparation method and application disclosed by the present invention have the following beneficial effects:

[0026] The present invention relates to a novel fracturing and sand control fluid. No solid proppant needs to be added on the ground. After the fluid is pumped into the formation, solid particles are generated underground as proppants to keep the fractures from closing so that oil and gas can flow out.

[0027] The on-site construction is simple and no proppant or crosslinking agent is required. After part of the fracturing and sand control fluid becomes solid proppants, there is no need to flow back to the ground before production.

[0028] The fracturing and sand control fluid of the present invention can enter microfractures where conventional solid proppants are not suitable to enter, and has better conductivity. Description of the Drawings

[0029] Figure 1 It is a flow chart of a preparation method of a fracturing and sand control fluid with self-generated proppants disclosed by the present invention. Detailed Description of the Invention

[0030] The following is a detailed description of the specific embodiments of the present invention.

[0031] In this application, the technical indicators of bisphenol A epoxy resin are as follows: among them, E-55(616) represents the same bisphenol A epoxy resin, where E-55 is the new brand number and 616 is the old brand number. The specific technical indicators of the required bisphenol A epoxy resin are shown in Table 1:

[0032] Table 1

[0033]

[0034]

[0035] Example 1

[0036] A fracturing and sand control fluid with self-generated proppants is composed of the following components:

[0037] Epoxy resin 10%, curing agent 1%, plasticizer 1%, nano-particles 0.5%, and the balance is an aqueous solution of a modified polymer with a mass concentration of 0.05%.

[0038] Furthermore, the epoxy resin is bisphenol A epoxy resin.

[0039] Further, the type of the bisphenol A epoxy resin is E-44. In another embodiment, the type of the bisphenol A epoxy resin is E-55. In another embodiment, the type of the bisphenol A epoxy resin is E-51. In another embodiment, the type of the bisphenol A epoxy resin is E-42. In another embodiment, the type of the bisphenol A epoxy resin is E-35. In another embodiment, the type of the bisphenol A epoxy resin is E-20. In another embodiment, the type of the bisphenol A epoxy resin is E-12. In another embodiment, the type of the bisphenol A epoxy resin is E-06. In another embodiment, the type of the bisphenol A epoxy resin is E-03.

[0040] Further, the curing agent is ethylenediamine.

[0041] Further, the plasticizer is dibutyl phthalate.

[0042] Further, the nanoparticles are nano-silica.

[0043] Further, the modified polymer is composed of structural unit A, structural unit B, structural unit C and structural unit D. Among them, structural unit A has the structure shown in formula (1), structural unit B has the structure shown in formula (2), structural unit C has the structure shown in formula (3), and structural unit D has the structure shown in formula (4). Based on the weight of the modified polymer, the content of structural unit A is 5 wt%, the content of structural unit B is 2 wt%, the content of structural unit D is 2 wt%, and the balance is structural unit C. The viscosity-average molecular weight of the modified polymer is greater than 18 million.

[0044]

[0045] Furthermore, the viscosity-average molecular weight of the modified polymer is 20 million.

[0046] The structural unit A is obtained by amide hydrolysis.

[0047] A preparation method of the fracturing sand control fluid with self-generated proppant according to any one of the above, the specific steps are as follows:

[0048] (1). Add an appropriate amount of the modified polymer to an appropriate amount of water to obtain an aqueous solution of the modified polymer with a concentration of 0.05% of the formula amount;

[0049] (2). Mix and stir the formula amount of nanoparticles, the formula amount of epoxy resin, and the formula amount of plasticizer, and then add the formula amount of curing agent thereto and stir evenly to obtain a mixture;

[0050] (3) While stirring, add the mixture obtained in step (2) to the modified polymer aqueous solution obtained in step (1), and after stirring evenly, a fracturing sand control fluid capable of self-generating proppants is obtained.

[0051] The fracturing sand control fluid capable of self-generating proppants prepared in Example 1 was placed at room temperature for 2 hours to react to form proppants in the shape of spherical particles, and the particle size range thereof was 0.1-2 mm.

[0052] A fracturing sand control fluid capable of self-generating proppants is prepared by the preparation method described in any one of the above.

[0053] Application of the fracturing sand control fluid capable of self-generating proppants described in any one of the above as a fracturing sand control fluid in oil exploitation.

[0054] During use, within 30 minutes after the fracturing sand control fluid capable of self-generating proppants is prepared, use a high-pressure pump to inject the fracturing sand control fluid capable of self-generating proppants into the ground.

[0055] Example 2

[0056] A fracturing sand control fluid capable of self-generating proppants, which is composed of the following components:

[0057] Epoxy resin 25%, curing agent 10%, plasticizer 3%, nano-particles 10%, and the balance is a modified polymer aqueous solution with a mass concentration of 0.3%.

[0058] Furthermore, the epoxy resin is bisphenol A type epoxy resin.

[0059] Furthermore, the model of the bisphenol A type epoxy resin is E-20.

[0060] Furthermore, the curing agent is hexamethylenediamine.

[0061] Furthermore, the plasticizer is bis(2-ethylhexyl) sebacate.

[0062] Furthermore, the nano-particles are nano-graphite powder.

[0063] Furthermore, the modified polymer is composed of structural unit A, structural unit B, structural unit C, and structural unit D. Among them, structural unit A has the structure shown in formula (1), structural unit B has the structure shown in formula (2), structural unit C has the structure shown in formula (3), and structural unit D has the structure shown in formula (4). Based on the weight of the modified polymer, the content of structural unit A is 20% by weight, the content of structural unit B is 10% by weight, the content of structural unit D is 10% by weight, and the balance is structural unit C. The viscosity-average molecular weight of the modified polymer is greater than 18 million.

[0064]

[0065] Furthermore, the viscosity-average molecular weight of the modified polymer is 35 million.

[0066] The structural unit A is obtained by amide hydrolysis.

[0067] A preparation method of a fracturing sand control fluid with self-generated proppant as described in any one of the above, the specific steps are as follows:

[0068] (1) Add an appropriate amount of modified polymer to an appropriate amount of water to obtain an aqueous solution of the modified polymer with a concentration of 0.3% of the formulation amount.

[0069] (2) Mix and stir the formulation amount of nanoparticles, the formulation amount of epoxy resin, and the formulation amount of plasticizer, and then add the formulation amount of curing agent thereto and stir evenly to obtain a mixture.

[0070] (3) While stirring, add the mixture obtained in step (2) to the aqueous solution of the modified polymer obtained in step (1), and stir evenly to obtain a fracturing sand control fluid with self-generated proppant.

[0071] The fracturing sand control fluid with self-generated proppant prepared in Example 2 is placed at 60 °C for 1 hour to react to form spherical granular proppant, and the particle size range thereof is 0.1 - 3 mm.

[0072] A fracturing sand control fluid with self-generated proppant, which is prepared by the preparation method described in any one of the above.

[0073] The application of the fracturing sand control fluid with self-generated proppant as described in any one of the above as a fracturing sand control fluid in oil exploitation.

[0074] During use, within 30 minutes after the fracturing sand control fluid with self-generated proppant is configured, use a high-pressure pump to inject the fracturing sand control fluid with self-generated proppant into the ground.

[0075] Example 3

[0076] A fracturing sand control fluid with self-generated proppant, which is composed of the following components:

[0077] Epoxy resin 15%, curing agent 5%, plasticizer 2%, nanoparticles 5%, and the balance is an aqueous solution of modified polymer with a mass concentration of 0.15%.

[0078] Furthermore, the epoxy resin is bisphenol A type epoxy resin.

[0079] Furthermore, the model of the bisphenol A type epoxy resin is E-03.

[0080] Furthermore, the curing agent is diethylenetriamine.

[0081] Further, the plasticizer is dibutyl phthalate.

[0082] Further, the nanoparticles are nano-silica.

[0083] Further, the modified polymer is composed of structural unit A, structural unit B, structural unit C and structural unit D. Among them, structural unit A has the structure shown in formula (1), structural unit B has the structure shown in formula (2), structural unit C has the structure shown in formula (3), and structural unit D has the structure shown in formula (4). Based on the weight of the modified polymer, the content of structural unit A is 10% by weight, the content of structural unit B is 5% by weight, the content of structural unit D is 7% by weight, and the balance is structural unit C. The viscosity-average molecular weight of the modified polymer is greater than 18 million.

[0084]

[0085] Furthermore, the viscosity-average molecular weight of the modified polymer is 25 million.

[0086] The structural unit A is obtained by amide hydrolysis.

[0087] A method for preparing a fracturing sand control fluid with self-generated proppant according to any one of the above, the specific steps are as follows:

[0088] (1) Add an appropriate amount of the modified polymer to an appropriate amount of water to obtain an aqueous solution of the modified polymer with a concentration of 0.15% of the formula amount.

[0089] (2) Mix and stir the formula amount of nanoparticles, the formula amount of epoxy resin, and the formula amount of plasticizer, and then add the formula amount of curing agent thereto and stir evenly to obtain a mixture.

[0090] (3) While stirring, add the mixture obtained in step (2) to the aqueous solution of the modified polymer obtained in step (1), and stir evenly to obtain a fracturing sand control fluid with self-generated proppant.

[0091] The fracturing sand control fluid with self-generated proppant prepared in Example 3 was placed at 50 °C for 1 hour to react to form spherical proppant particles with a particle size range of 0.1 - 1.5 mm.

[0092] A fracturing sand control fluid with self-generated proppant, which is prepared by the preparation method according to any one of the above.

[0093] Application of the fracturing sand control fluid with self-generated proppant according to any one of the above as a fracturing sand control fluid in oil exploitation.

[0094] When in use, within 30 minutes after the self - generating proppant fracturing sand control fluid is prepared, use a high - pressure pump to inject the self - generating proppant fracturing sand control fluid into the ground.

[0095] Example 4

[0096] A self - generating proppant fracturing sand control fluid is composed of the following components:

[0097] Epoxy resin 20%, curing agent 8%, plasticizer 2%, nanoparticles 5%, and the balance is an aqueous solution of a modified polymer with a mass concentration of 0.2%.

[0098] Furthermore, the epoxy resin is bisphenol A epoxy resin.

[0099] Even further, the model of the bisphenol A epoxy resin is E - 06.

[0100] Furthermore, the curing agent is ethylenediamine. In another embodiment, the curing agent is hexamethylenediamine. In another embodiment, the curing agent is diethylenetriamine. In another embodiment, the curing agent is triethylenetetramine. In another embodiment, the curing agent is diethylaminopropylamine. In another embodiment, the curing agent is diaminobenzene. In another embodiment, the curing agent is 1,6 - hexanediamine. In another embodiment, the curing agent is diethylenetriamine. In another embodiment, the curing agent is a mixture of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diethylaminopropylamine, diaminobenzene, 1,6 - hexanediamine, and diethylenetriamine in an equal mass ratio.

[0101] Furthermore, the plasticizer is dibutyl phthalate. In another embodiment, the plasticizer is bis(2 - ethylhexyl) sebacate. In another embodiment, the plasticizer is di - n - octyl adipate. In another embodiment, the plasticizer is dibutyl sebacate. In another embodiment, the plasticizer is di - n - butyl adipate. In another embodiment, the plasticizer is a mixture of bis(2 - ethylhexyl) sebacate, di - n - octyl adipate, dibutyl sebacate, di - n - butyl adipate, and dibutyl phthalate in an equal mass ratio.

[0102] Furthermore, the nanoparticles are nanopolyaniline. In another embodiment, the nanoparticles are a mixture of nanosilica, nanographite powder, and nanopolyaniline in an equal mass ratio.

[0103] Further, the modified polymer is composed of structural unit A, structural unit B, structural unit C and structural unit D. Among them, structural unit A has the structure shown in formula (1), structural unit B has the structure shown in formula (2), structural unit C has the structure shown in formula (3), and structural unit D has the structure shown in formula (4). Based on the total weight of the modified polymer, the content of structural unit A is 8% by weight, the content of structural unit B is 6% by weight, the content of structural unit D is 4% by weight, and the balance is structural unit C. The viscosity-average molecular weight of the modified polymer is greater than 18 million.

[0104]

[0105] Furthermore, the viscosity-average molecular weight of the modified polymer is 22 million.

[0106] The structural unit A is obtained by amide hydrolysis.

[0107] A preparation method of a fracturing sand control fluid with self-generated proppant as described in any one of the above items, the specific steps are as follows:

[0108] (1) Add an appropriate amount of the modified polymer to an appropriate amount of water to obtain an aqueous solution of the modified polymer with a concentration of 0.2% of the formulated amount.

[0109] (2) Mix and stir the formulated amount of nanoparticles, the formulated amount of epoxy resin, and the formulated amount of plasticizer, and then add the formulated amount of curing agent thereto and stir evenly to obtain a mixture.

[0110] (3) While stirring, add the mixture obtained in step (2) to the aqueous solution of the modified polymer obtained in step (1), and stir evenly to obtain a fracturing sand control fluid with self-generated proppant.

[0111] The fracturing sand control fluid with self-generated proppant prepared in Example 4 was placed at room temperature for 2 hours to react to form spherical proppant particles with a particle size range of 0.1 - 3.0 mm.

[0112] A fracturing sand control fluid with self-generated proppant, which is prepared by the preparation method described in any one of the above items.

[0113] Application of the fracturing sand control fluid with self-generated proppant as described in any one of the above items as a fracturing sand control fluid in oil exploitation.

[0114] During use, within 30 minutes after the fracturing sand control fluid with self-generated proppant is configured, use a high-pressure pump to inject the fracturing sand control fluid with self-generated proppant into the ground.

[0115] Performance Characterization

[0116] Experimental Example 1:

[0117] Using the FDDL-III type proppant fracture conductivity evaluation tester, measure the amount of proppant broken after 120 s under the closure pressures of 20 MPa, 40 MPa, 60 MPa, and 80 MPa for the self-generated proppants in Examples 1-4, and calculate the breakage rate.

[0118] The calculation results are shown in Table 2:

[0119] Table 2

[0120] 20MPa 40MPa 60MPa 80MPa Example 1 2.23％ 3.56％ 5.97％ 8.32％ Example 2 1.73％ 3.05％ 4.87％ 7.63％ Example 3 1.66％ 2.82％ 4.78％ 7.09％ Example 4 2.17％ 3.38％ 5.67％ 8.01％

[0121] As can be seen from Table 2, the self-generated proppants in Examples 1-4 all have good mechanical properties.

[0122] Test Example 2

[0123] Select the in-situ generated proppants with a mesh size of 20 to 40 prepared in Examples 1-4, and evaluate their conductivity performance. The specific steps are as follows:

[0124] 1) Pass through 20-mesh and 40-mesh sieves to screen out proppants with a particle size in the range of 20 / 40 mesh;

[0125] 2) Weigh a certain amount of proppants and load them into a standard flow-through cell. The loading amount is calculated according to 5 kg / m 2 Calculate;

[0126] 3) Using the FDDL-III type proppant fracture conductivity evaluation tester, change the overburden pressure and measure the short-term fracture conductivity of the prepared proppants. The units are all μm 2 .cm.

[0127] The measurement results are shown in Table 3.

[0128] Table 3

[0129] Proppant 10MPa 20MPa 30MPa Example 1 87 68 50 Example 2 92 75 58 Example 3 95 81 61 Example 4 89 70 56

[0130] As can be seen from Table 3, the in-situ generated proppants with a mesh size of 20 to 40 prepared in Examples 1-4 have good short-term fracture conductivity.

[0131] In summary, the fracturing sand control fluid of the self-generated proppant of the present invention is injected into the artificial fracture, forming small liquid droplet particles dispersed in the fracturing sand control fluid during the pumping process, and the fracturing sand control fluid carries the small liquid droplet particles into the artificial fracture and solidifies to form proppants, obtaining a high-speed seepage channel and improving the oil and gas field exploitation efficiency. That is, the proppant exists in the form of a proppant raw material liquid before entering the artificial fracture, and after entering the fracture, the liquid droplets of the proppant raw material liquid solidify in the fracture to form solid particle proppants, playing the role of proppants. Compared with conventional proppants, this proppant has more excellent performance and overcomes the deficiencies existing in the use of conventional proppants.

[0132] The above has described the embodiments of the present invention in detail. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A fracturing sand control fluid with self-generated proppant, characterized in that: It is composed of the following components: 10-25% epoxy resin, 1-10% curing agent, 1-3% plasticizer, 0.5-10% nanoparticles, and the balance is a modified polymer aqueous solution with a mass concentration of 0.05-0.3%.

2. A fracturing sand control fluid with self-generated proppant according to claim 1, characterized in that: The epoxy resin is bisphenol A type epoxy resin.

3. A fracturing sand control fluid with self-generated proppant according to claim 2, characterized in that: The model of the bisphenol A epoxy resin is one of E-55, E-51, E-44, E-42, E-35, E-20, E-12, E-06 and E-03.

4. The fracturing sand control fluid with self-generated proppant according to claim 1, characterized in that: The curing agent is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diethylaminopropylamine, diaminobenzene, 1,6-hexanediamine and diethylenetriamine.

5. The fracturing sand control fluid with self-generated proppant according to claim 1, characterized in that: The plasticizer is one or more of di(2-ethylhexyl) sebacate, di-n-octyl adipate, dibutyl sebacate, di-n-butyl adipate, and dibutyl phthalate.

6. The fracturing sand control fluid with self-generated proppant according to claim 1, characterized in that: The nanoparticles are one or more of nano-silicon dioxide, nano-graphite powder and nano-polyaniline.

7. The fracturing sand control fluid with self-generated proppant according to claim 1, characterized in that: The modified polymer is composed of a structural unit A, a structural unit B, a structural unit C and a structural unit D, wherein the structural unit A has a structure shown in formula (1), the structural unit B has a structure shown in formula (2), the structural unit C has a structure shown in formula (3), and the structural unit D has a structure shown in formula (4). Based on the weight of the modified polymer, the content of the structural unit A is 5% to 20% by weight, the content of the structural unit B is 2% to 10% by weight, the content of the structural unit D is 2% to 10% by weight, and the balance is the structural unit C. The viscosity average molecular weight of the modified polymer is greater than 18 million; 8. The fracturing sand control fluid with self-generated proppant according to claim 7, characterized in that: The viscosity average molecular weight of the modified polymer is 20 million to 35 million.

9. A method for preparing a fracturing sand control fluid with a self-generated proppant according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: (1) adding an appropriate amount of modified polymer to an appropriate amount of water to obtain an aqueous solution of modified polymer with a concentration of 0.05-0.3%; (2) mixing a formulated amount of nanoparticles, a formulated amount of epoxy resin, and a formulated amount of plasticizer, and then adding a formulated amount of curing agent thereto and stirring to obtain a mixture; (3) Add the mixture obtained in step (2) to the modified polymer aqueous solution obtained in step (1) while stirring, and stir to obtain a fracturing sand control fluid with a self-generated proppant.

10. A fracturing sand control fluid with self-generated proppant, prepared by the preparation method according to any one of claims 1 to 8.

11. Use of the fracturing sand control fluid containing the self-generated proppant according to any one of claims 1 to 8 and 10 as a fracturing sand control fluid in petroleum production.

12. The use according to claim 11, characterized in that In use, the fracturing and sand control fluid with self-generated proppant can be pumped into the ground by a high-pressure pump within 30 minutes after the preparation is completed.

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