Fracturing sand prevention fluid self-generating proppant and preparation method and application thereof

Abstract

The application discloses a fracturing sand prevention fluid capable of generating proppant by itself, which is composed of the following components: 10-25% of epoxy resin, 1-10% of curing agent, 1-3% of plasticizer, 0.5-10% of nano-particles, and the rest is modified polymer aqueous solution with a mass concentration of 0.05-0.3%. The application further discloses a preparation method of the fracturing sand prevention fluid capable of generating proppant by itself, which comprises the following steps: (1) adding a proper amount of modified polymer into water to obtain a modified polymer aqueous solution with a concentration of 0.05-0.3%; (2) mixing and stirring formula amount of nano-particles, epoxy resin and plasticizer, then adding formula amount of curing agent into the mixture and stirring uniformly 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 stirring uniformly to obtain the fracturing sand prevention fluid capable of generating proppant by itself. The application further discloses an application of the fracturing sand prevention fluid capable of generating proppant by itself in oil exploitation as a fracturing sand prevention fluid.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of oil exploitation, and particularly relates to a fracturing sand control liquid capable of generating proppants, and a preparation method and application thereof. BACKGROUND

[0002] Fracturing sand control is a typical bilinear flow form due to the existence of fractures, and is achieved by pumping proppants into an oil layer at high pressure to cause micro-fractures in the near-wellbore zone of the oil well, and by extruding the proppants into the fractures and formation voids to form an artificial sand filter barrier of a certain thickness in the oil layer, i.e., an artificial sand bridge, so as to achieve the purpose of oil well sand control by relying on sand. For example, Chinese Patent Application CN107461182A discloses a layered fracturing sand control method, which comprises the following steps: dividing an oil layer into a first permeability oil layer and a second permeability oil layer. Blocking the first permeability oil layer and fracturing and sand-controlling the second permeability oil layer. After the fracturing and sand-controlling of the second permeability oil layer is completed, unblocking the first permeability oil layer and fracturing and sand-controlling the first permeability oil layer.

[0003] Fracturing sand control forms micro-fracture chains in the formation, and artificial proppants form high flow channels in the fractures, thereby changing the flow state in the oil layer, changing the original centripetal radial flow of crude oil into horizontal flow toward the fractures, improving the flow conditions, and thus reducing the sand-cutting capacity of the oil flow. At the same time, the high-pressure extruded proppants change the stress state of the formation sand, making it difficult for the formation sand to move toward the wellbore. In addition, the high-pressure artificial well can effectively compensate for the formation voids, forming a dense high-permeability zone within a certain range of the wellbore, which can reduce the production pressure difference and the fluid flow rate around the wellbore, and relieve the formation sand production. Due to the high displacement and large flow rate of the sand-carrying liquid during fracturing sand control construction, the near-wellbore zone can be effectively unblocked, and good unblocking and production-increasing effects can be achieved. Chinese Patent Application CN104449625A discloses an oil and gas field fracturing sand control liquid and its construction method, which belongs to the technical field of oil and gas drilling and production. The oil and gas field fracturing sand control liquid comprises fracturing fluid and ceramic particles of different particle sizes, and the particle size distribution range of the ceramic particles is 20-140 mesh. The oil and gas field fracturing sand control liquid of the present application enters the sand-producing layer with different proportions and specifications of ceramic particles, and forms a certain blocking layer by close packing. The clean fracturing fluid is returned to the ground under the action of the well environment or the breaker, and the ceramic particles of different particle size distributions remain in the formation to form a filter layer with good stability and filtration performance, thereby achieving the effect of sand control. However, the ceramic particles need to be configured on the ground of the injection well before being injected, and the whole process is relatively complicated.

[0004] Based on this, there is no proppant fracturing sand control fluid, which can simplify the gravel packing sand process. Acidizing is a proppant-free method for increasing oil and gas production, especially for carbonate formations, but also has a short range of limitations, and acid corrosion is a serious problem. As mentioned in US Patent Application US3366178A, proppant is formed in situ in the formation, which uses a solidified material containing a portion of the dispersed liquid that can be removed. When the liquid solidifies, a porous solid is formed after removing part of the material. However, this technique has the disadvantage of the contradiction between compressive strength and conductivity: in order to increase the compressive strength, the porosity must be reduced. When a high conductivity is obtained, the proportion of the material removed can be large, resulting in a significant reduction in the strength of the material. SUMMARY

[0005] The purpose of the application is to overcome the shortcomings of the prior art. The application discloses a self-generating proppant fracturing sand control fluid and its preparation method and application.

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

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

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

[0009] Further, 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, and E-03.

[0010] Further, the curing agent is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diethylaminopropylamine, diamino benzene, 1,6-hexanediamine, and diethylenetriamine.

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

[0012] Further, the nanoparticles are one or more of nanosilica, nanographite powder, and nanopolyaniline.

[0013] Further, the modified polymer is composed of structural unit A, structural unit B, structural unit C and structural unit D, wherein the structural unit A has the structure shown in formula (1), the structural unit B has the structure shown in formula (2), the structural unit C has the structure shown in formula (3), and the structural unit D has the structure shown in formula (4), the content of the structural unit A is 5%-20% by weight, the content of the structural unit B is 2%-10% by weight, the content of the structural unit D is 2%-10% by weight, the rest is the structural unit C, and the viscosity average molecular weight of the modified polymer is greater than 18 million.

[0014]

[0015]

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

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

[0018] A preparation method of the self-generating proppant fracturing sand control fluid, and the specific steps are as follows:

[0019] (1) a certain amount of modified polymer is added into a certain amount of water to obtain a modified polymer aqueous solution with a concentration of 0.05-0.3% of the formula amount;

[0020] (2) the formula amount of nanoparticles, the formula amount of epoxy resin and the formula amount of plasticizer are mixed and stirred, then the formula amount of curing agent is added and stirred to obtain a mixture;

[0021] (3) while stirring, the mixture obtained in step (2) is added into the modified polymer aqueous solution obtained in step (1), and after stirring, a self-generating proppant fracturing sand control fluid is obtained.

[0022] A self-generating proppant fracturing sand control fluid prepared by the preparation method.

[0023] The self-generating proppant fracturing sand control fluid is used as a fracturing sand control fluid in oil exploitation.

[0024] In use, the self-generating proppant fracturing sand control fluid is pressed into the underground by a high-pressure pump within 30 minutes after the configuration is completed.

[0025] Beneficial effects: the self-generating proppant fracturing sand control fluid, the preparation method and the application thereof have the following beneficial effects:

[0026] The present application is a new fracturing sand control liquid, which does not need to add solid proppant on the ground, and generates solid particles as proppant in the ground after the liquid is pressed into the formation, so as to keep the fracture from closing and make oil and gas flow out;

[0027] The field operation is simple, and does not need proppant and crosslinking agent. After part of the fracturing sand control liquid becomes solid proppant, it does not need to be returned to the ground before production.

[0028] The fracturing sand control liquid of the present application can enter microfractures which are not suitable for conventional solid proppant to enter, and has better flow conductivity. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The present application discloses a flow chart of a preparation method of a fracturing sand control liquid which generates proppant by itself. DETAILED DESCRIPTION

[0030] The specific embodiment of the present application is described in detail below.

[0031] In the present application, the technical indexes of bisphenol A type epoxy resin are as follows: wherein: E-55 (616) represents the same bisphenol A type epoxy resin, wherein: E-55 is a new brand, and 616 is an old brand. The technical indexes of the required bisphenol A type epoxy resin are shown in Table 1:

[0032] Table 1

[0033]

[0034]

[0035] Example 1

[0036] A fracturing sand control liquid which generates proppant by itself is composed of the following components:

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

[0038] Further, the epoxy resin is bisphenol A type epoxy resin.

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

[0040] Further, the curing agent is ethylenediamine.

[0041] Further, the plasticizer is dibutyl phthalate.

[0042] Further, the nanoparticles are nanosilica.

[0043] Further, the modified polymer is composed of structural unit A, structural unit B, structural unit C and structural unit D, wherein 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), the content of structural unit A is 5% by weight, the content of structural unit B is 2% by weight, the content of structural unit D is 2% by weight, the balance is structural unit C, and the viscosity average molecular weight of the modified polymer is greater than 18 million.

[0044]

[0045] Further, 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 self-supporting proppant fracturing sand control fluid described in any one of the above, the specific steps are as follows:

[0048] (1) A certain amount of modified polymer is added to a certain amount of water to obtain a modified polymer aqueous solution with a concentration of 0.05% of the formula amount;

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

[0050] (3) while stirring, the mixture obtained in step (2) is added to the modified polymer aqueous solution obtained in step (1), and after stirring, a self-generating proppant fracturing sand control fluid is obtained.

[0051] The self-generating proppant fracturing sand control fluid prepared in Example 1 is allowed to react at room temperature for 2 hours, and spherical granular proppants with a particle size range of 0.1-2 mm are generated.

[0052] A self-generating proppant fracturing sand control fluid prepared by any one of the preparation methods described above.

[0053] The self-generating proppant fracturing sand control fluid described in any one of the above is used as a fracturing sand control fluid in oil production.

[0054] The self-generating proppant fracturing sand control fluid is used, and within 30 minutes after the configuration is completed, the self-generating proppant fracturing sand control fluid is pressed into the ground by a high-pressure pump.

[0055] Example 2

[0056] A self-generating proppant fracturing sand control fluid is prepared from 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] Further, the epoxy resin is a bisphenol A type epoxy resin.

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

[0060] Further, the curing agent is hexamethylene diamine.

[0061] Further, the plasticizer is di(2-ethylhexyl) sebacate.

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

[0063] Further, the modified polymer is composed of structural unit A, structural unit B, structural unit C, and structural unit D, wherein 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), 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, the balance is structural unit C, and the viscosity average molecular weight of the modified polymer is greater than 18 million.

[0064]

[0065] Further, 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 the self-generating proppant fracturing sand control fluid, the specific steps are as follows:

[0068] (1) A certain amount of modified polymer is added into a certain amount of water to obtain a modified polymer aqueous solution with a concentration of 0.3% of the formula amount;

[0069] (2) The formula amount of nanoparticles, the formula amount of epoxy resin, and the formula amount of plasticizer are mixed and stirred, and then the formula amount of curing agent is added and stirred evenly to obtain a mixture;

[0070] (3) While stirring, the mixture obtained in step (2) is added to the modified polymer aqueous solution obtained in step (1), and after stirring, a self-generating proppant fracturing sand control fluid is obtained.

[0071] The self-generating proppant fracturing sand control fluid prepared in Example 2 is placed at 60°C for 1 hour to react to generate spherical granular proppants with a particle size range of 0.1-3mm.

[0072] A self-generating proppant fracturing sand control fluid prepared by the preparation method of any one of the above.

[0073] The self-generating proppant fracturing sand control fluid of any one of the above is used as a fracturing sand control fluid in oil exploitation.

[0074] In use, the self-generating proppant fracturing sand control fluid is pumped into the underground within 30 minutes after the configuration is completed by using a high-pressure pump.

[0075] Example 3

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

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

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

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

[0080] Further, the curing agent is diethylene triamine.

[0081] Further, the plasticizer is dibutyl phthalate.

[0082] Further, the nanoparticle is nanosilica.

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

[0084]

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

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

[0087] A preparation method of the self-generating proppant fracturing sand control fluid, comprising the following steps:

[0088] (1) adding a proper amount of modified polymer into a proper amount of water to obtain a modified polymer aqueous solution with a concentration of 0.15% of the formula amount;

[0089] (2) mixing and stirring the formula amount of nanoparticles, the formula amount of epoxy resin and the formula amount of plasticizer, and then adding the formula amount of curing agent into the mixture and stirring evenly to obtain a mixture;

[0090] (3) adding the mixture obtained in step (2) into the modified polymer aqueous solution obtained in step (1) while stirring, and stirring evenly to obtain the self-generating proppant fracturing sand control fluid.

[0091] The self-generating proppant fracturing sand control fluid prepared in Example 3 is placed at 50℃ for 1 hour, and spherical granular proppants are generated by reaction, with a particle size range of 0.1-1.5mm.

[0092] A self-generating proppant fracturing sand control fluid prepared by the preparation method of any one of the above.

[0093] The self-generating proppant fracturing sand control fluid of any one of the above is applied as a fracturing sand control fluid in oil exploitation.

[0094] The use is, the self-generated proppant fracturing sand control fluid in 30 minutes after the configuration is completed, the self-generated proppant fracturing sand control fluid is pressed into the ground with high pressure pump.

[0095] Example 4

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

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

[0098] Further, the epoxy resin is a bisphenol A type epoxy resin.

[0099] Further, the bisphenol A type epoxy resin is model E-06.

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

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

[0102] Further, the nanoparticles are nano-polyaniline. In another embodiment, the nanoparticles are a mixture of nano-silicon dioxide, nano-graphite powder, and nano-polyaniline in equal mass ratio.

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

[0104]

[0105] Further, 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 the self-generating proppant fracturing sand control fluid according to any one of the above, and the specific steps are as follows:

[0108] (1) A proper amount of modified polymer is added into a proper amount of water to obtain a modified polymer aqueous solution with a concentration of 0.2% of the formula amount;

[0109] (2) The formula amount of nanoparticles, the formula amount of epoxy resin and the formula amount of plasticizer are mixed and stirred, and then the formula amount of curing agent is added and stirred evenly to obtain a mixture;

[0110] (3) While stirring, the mixture obtained in step (2) is added to the modified polymer aqueous solution obtained in step (1), and after stirring, a self-generating proppant fracturing sand control fluid is obtained.

[0111] The self-generating proppant fracturing sand control fluid prepared in Example 4 is placed at room temperature for 2 hours, and spherical particle proppants are generated by reaction, with a particle size range of 0.1-3.0 mm.

[0112] A self-generating proppant fracturing sand control fluid prepared by the preparation method according to any one of the above.

[0113] The self-generating proppant fracturing sand control fluid according to any one of the above is used as a fracturing sand control fluid in oil exploitation.

[0114] In use, the self-generating proppant fracturing sand control fluid is pumped into the underground by a high-pressure pump within 30 minutes after the configuration is completed.

[0115] Performance characterization

[0116] Experimental Example 1:

[0117] The FDDL-III proppant fracture conductivity evaluation tester is used to measure the broken amount of the self-generating proppant in Examples 1-4 after 120 s under 20 MPa, 40 MPa, 60 MPa and 80 MPa closure pressure, and the broken rate is calculated.

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

[0119] Table 2

[0120] 20 MPa 40 MPa 60 MPa 80 MPa 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] From Table 2, it can be seen that the self-generating proppants in Examples 1-4 all have good mechanical properties.

[0122] Test Example 2

[0123] The 20-40 mesh in-situ generated proppants prepared in Examples 1-4 are selected for performance evaluation of their conductivity, and the specific steps are as follows:

[0124] 1) The proppants with particle size in the range of 20 / 40 mesh are screened out through 20 mesh and 40 mesh screens;

[0125] 2) A certain amount of proppants is weighed and loaded into a standard conductivity chamber, and the loading amount is 5 kg / m 2 .

[0126] 3) The FDDL-III proppant fracture conductivity evaluation tester is used to change the overburden pressure and determine the short-term fracture conductivity of the prepared proppants, and the unit is μm 2 .cm.

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

[0128] Table 3

[0129] proppant 10 MPa 20 MPa 30 MPa 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 20-40 mesh in-situ generated proppants prepared in Examples 1-4 have good short-term fracture conductivity.

[0131] In summary, the self-generating proppant of the present application is injected into an artificial fracture by fracturing sand control fluid, small liquid bead particles are formed and dispersed in the fracturing sand control fluid during pumping, and the fracturing sand control fluid carries the small liquid bead particles into the artificial fracture and solidifies to form proppants, obtaining a high-speed flow channel and improving the oil and gas field exploitation efficiency. That is, the proppant exists in the form of proppant raw material liquid before entering the artificial fracture, and the liquid bead of the proppant raw material liquid solidifies to form solid particle proppants in the fracture after entering the fracture, and the proppants play a supporting role. Compared with conventional proppants, the proppants have more excellent performance and overcome the shortcomings of conventional proppants in use.

[0132] The embodiments of the present application are described above in detail. However, the present application is not limited to the above embodiments but various changes which can be conceived by those having ordinary knowledge in the art to which the present application pertains can be made without departing from the scope of the present application.

Claims

1. A fracturing fluid for sand control that self-generates proppant, characterized in that, consists of: epoxy resin 10-25%, curing agent 1-10%, plasticizer 1-3%, nanoparticles 0.5-10%, the rest is modified polymer aqueous solution with mass concentration of 0.05-0.3%, wherein: the nanoparticles are one or more of nanosilica, nanographite powder, and nanopolyaniline; the modified polymer consists of structural unit A, structural unit B, structural unit C, and structural unit D, wherein 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), the content of structural unit A is 5-20% by weight, the content of structural unit B is 2-10% by weight, the content of structural unit D is 2-10% by weight, the rest is structural unit C, and the viscosity average molecular weight of the modified polymer is greater than 18 million; 2. A self-proppant fracturing fluid for sand control according to claim 1, wherein, the epoxy resin is a bisphenol A type epoxy resin.

3. A self-proppant fracturing fluid sand control fluid as set forth in claim 2 wherein, 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, and E-03.

4. A self-proppant fracturing fluid sand control fluid as defined by claim 1, wherein, the curing agent is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diethylaminopropylamine, diamino benzene, 1,6-hexanediamine, and diethylenetriamine.

5. A self-proppant fracturing fluid sand control fluid as defined by claim 1, wherein, 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. A self-proppant fracturing fluid sand control fluid as defined by claim 1, wherein, the viscosity average molecular weight of the modified polymer is 20-35 million.

7. A method of preparing the self-proppant fracturing fluid sand control fluid according to any one of claims 1-6, characterized in that, The specific steps are as follows: (1) a certain amount of modified polymer is added to a certain amount of water to obtain a modified polymer aqueous solution with a concentration of 0.05-0.3% of the formulation amount; (2) the formulation amount of nanoparticles, the formulation amount of epoxy resin, and the formulation amount of plasticizer are mixed and stirred, then the formulation amount of curing agent is added and stirred to obtain a mixture; (3) while stirring, the mixture obtained in step (2) is added to the modified polymer aqueous solution obtained in step (1), and after stirring, a self-generating proppant fracturing sand control fluid is obtained.

8. A self-generating proppant fracturing sand control fluid prepared by the preparation method of claim 7.

9. The use of the self-generating proppant fracturing sand control fluid of any one of claims 1-6 and 8 as a fracturing sand control fluid in oil exploitation.

10. The use according to claim 9, wherein the compound is ###00003### or a pharmaceutically acceptable salt thereof. When used, the self-generating proppant fracturing sand control fluid is pumped into the underground within 30 minutes after being prepared by a high-pressure pump.

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