A self-supporting fracturing fluid system that can be prepared with natural salt water and its use

Abstract

The application discloses a self-supporting fracturing fluid system prepared by using various natural salt water and application thereof, and provides a self-supporting fracturing fluid system for development of geological energy (in particular, oil and gas, geothermal energy and natural gas hydrate), which is not affected by ion concentration in seawater, salt lake water and surface water, has low requirement on water source, can be prepared by using various types and concentrations of mineralization water source at the same time, and can be directly prepared by using various surface water to prepare the self-supporting fracturing fluid system, so that the requirement of water source for fracturing technology in areas lacking fresh water is met.

Description

Technical Field

[0001] This invention belongs to the field of geological energy development technology, specifically relating to a self-supporting fracturing fluid system that can be prepared with natural brine and its application. Background Technology

[0002] With the continuous development of oil and gas reservoir exploration and development, the proportion of conventional oil and gas is gradually decreasing, while the proportion of unconventional oil and gas is gradually increasing. The development of unconventional oil and gas, such as low-permeability, tight sandstone, and shale oil and gas, is of great significance for alleviating the contradiction between oil and gas supply and demand and ensuring my country's energy security. Hydraulic fracturing technology, as an essential technical means, has been widely used. Hydraulic fracturing injects high-pressure water carrying proppant into the formation to fracture the formation and create high-speed seepage channels for oil and gas. However, with the large-scale application of this technology, the problem of water consumption has become increasingly prominent.

[0003] Hydraulic fracturing technology requires a massive amount of water to carry proppant through injected water. Traditional fracturing techniques, to ensure the performance of the fracturing fluid, primarily use fresh water, posing a significant challenge to local water resources, especially in water-scarce regions. Utilizing seawater or fracturing fluid return water for fracturing fluid preparation would greatly alleviate water consumption. However, using seawater or fracturing fluid return water as an alternative water source inevitably results in high mineralization, particularly in the presence of divalent metal ions. This can affect the performance of conventional fracturing fluid systems, causing flocculation or self-crosslinking, poor temperature and shear resistance, and ultimately failing to meet operational requirements and achieve effective fracturing results. Therefore, there is an urgent need for fracturing technologies applicable to different mineralization conditions to replace freshwater sources for fracturing development.

[0004] Self-supporting fracturing technology utilizes both water-based fracturing fluid and self-supporting fracturing fluid to inject into the formation. On the one hand, it avoids the injection of solids, reducing the difficulty of construction. On the other hand, through the design of this invention, it can effectively avoid the impact of high salinity on the performance of fracturing fluid, making self-supporting fracturing fluid technology applicable to various salinities. This allows the use of seawater or fracturing backflow as a freshwater alternative resource, solving the problem of high freshwater consumption. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a self-supporting fracturing fluid system that can be prepared using natural brine.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a self-supporting fracturing fluid system that can be prepared with natural brine, characterized in that it includes: a phase change agent, an organic solvent, a curing accelerator, a dispersant, a drag reducer, a flocculant, a bactericide, and brine;

[0009] The composition, by weight of raw materials, includes 10-100 parts of the phase change agent, 1-20 parts of the organic solvent, 0.1-5 parts of the curing accelerator, 0.1-10 parts of the dispersant, 0.1-2 parts of the drag-reducing agent, 0.1-10 parts of the flocculant, 1-10 parts of the bactericide, and 100-2000 parts of the brine.

[0010] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the phase change agent includes phase change agent A and phase change agent B;

[0011] Wherein, phase change agent A is one or more of diallyl melamine, triallyl melamine, tetraallyl melamine, pentaallyl melamine, hexaallyl melamine, melamine, and triallyl isocyanurate;

[0012] Phase change agent B is one or more of the following: bisphenol S epoxy resin, bisphenol A epoxy resin, phenolic epoxy vinyl ester resin, bisphenol A type cyanate resin, pyrphenol A type cyanate resin, and dicyclopentadienol type cyanate resin.

[0013] The mass ratio of phase change agent A to phase change agent B is 1:100 to 100:1.

[0014] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the organic solvent is one or more of N-vinylpyrrolidone, ethylene glycol, and N,N-dimethylformamide.

[0015] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the curing accelerator is one or more of the following: methyl ethyl ketone peroxide, cumene hydroperoxide, acetylacetone peroxide, cyclohexanone peroxide, cobalt naphthenate, 4-tert-butylcyclohexyl ester, diphenoxyethyl percarbonate, tert-butyl peroxyoctanoate, tert-butyl peroxybenzoate, and azobisisobutyronitrile.

[0016] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the dispersant is at least one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, dodecylphenol polyoxyethylene ether-10, octylphenol polyoxyethylene ether-15, polyacrylic acid, and polyvinyl alcohol.

[0017] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the flocculant is one or more of the following: polyalumina, activated carbon, acrylamide-dimethyldiallylammonium chloride, acrylamide-diethyldiallylammonium chloride, acrylamide-acrylamido-2-methylpropanesulfonic acid, and anionic polyacrylamide.

[0018] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the drag-reducing agent is at least one of cationic polyacrylamide, poly(2-acrylamide-2-methyl-1-propanesulfonic acid), sodium acrylate and acrylamide copolymer, and perfluoromethacrylate copolymer.

[0019] As a preferred embodiment of the self-supporting fracturing fluid system of the present invention, the bactericide is dodecyltrimethylammonium chloride or tetradecyldimethylbenzylammonium chloride.

[0020] Another objective of this invention is to overcome the shortcomings of the prior art and provide a formulation for a self-supporting fracturing fluid system that can be prepared using various natural brine sources. The self-supporting fracturing fluid system can be prepared using natural brine sources to prepare a self-supporting solid phase.

[0021] In a preferred embodiment of the application described in this invention, the method for preparing the self-supporting solid phase includes:

[0022] Mix the phase change agent and organic solvent evenly and stir until the solution is clear and transparent to obtain component A;

[0023] Mix natural brine, flocculant, dispersant, drag reducer, and bactericide evenly and stir until the solution is clear and transparent to obtain component B;

[0024] Take the supernatant from B, mix it with component A, and stir in an oil bath to obtain component C;

[0025] Adding a curing accelerator to component C and reacting for a period of time yields a self-supporting solid phase.

[0026] In a preferred embodiment of the application described in this invention, the main sorting particle size of the self-supporting solid phase is 6 to 140 mesh.

[0027] Beneficial effects of this invention:

[0028] (1) This invention provides a self-supporting fracturing fluid system prepared with natural brine. This system is suitable for preparation with water of different mineralization levels and can be used as a substitute for fresh water in traditional fracturing technology, thus saving fresh water consumption.

[0029] (2) The self-supporting fracturing fluid disclosed in this invention is a liquid without solid phase at room temperature. When injected into formation fractures, it is heated by the formation to form a self-supporting solid phase with high strength and pressure resistance. The solidification temperature range of the self-supporting fracturing fluid is 30 to 180°C, and the main particle size range of the self-supporting solid phase formed after solidification is 6 to 140 mesh (0.109 to 3.35 mm).

[0030] (3) The self-supporting fracturing fluid system provided by the present invention reduces the difficulty of mine construction and has the characteristics of simple construction operation, safety and high efficiency. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0032] Figure 1 Self-supporting fracturing fluids prepared for different water sources are solidified to form a self-supporting solid phase diagram.

[0033] Figure 2 Self-supporting fracturing fluids formulated for different water sources are solidified to form a self-supporting solid phase fragmentation rate.

[0034] Figure 3 This is the self-supporting solid phase formed in Comparative Example 1 of the present invention.

[0035] Figure 4 This is the self-supporting solid phase formed in Comparative Example 2 of the present invention.

[0036] Figure 5 This is the self-supporting solid phase formed in Comparative Example 3 of the present invention.

[0037] Figure 6 The self-supporting solid phase breakage rate is the ratio formed in Comparative Examples 4 to 7 of this invention. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0041] The raw materials used in the embodiments of the present invention are shown in Table 1.

[0042] Table 1

[0043]

[0044]

[0045]

[0046] The various indicators of different types of water sources used in the embodiments of the present invention are shown in Table 2.

[0047] Table 2. Indicators for different types of water sources

[0048]

[0049]

[0050] Example 1

[0051] This embodiment describes a self-supporting fracturing fluid system prepared with seawater, including the following steps:

[0052] (1) Add 20g of melamine, 30g of triallyl isocyanurate, 50g of bisphenol S epoxy resin and 10g of N-vinylpyrrolidone to a 500mL beaker, and start stirring until the solution is completely clear and transparent.

[0053] (2) Add 1000g of seawater (parameters as shown in Table 1), 105g of dodecylphenol polyoxyethylene ether, 10g of polyalumina, 1g of cationic polyacrylamide, and 5g of tetradecyl dimethyl benzyl ammonium chloride to a 2L beaker, and start stirring until the solution is completely clear and transparent.

[0054] (3) Pour the solution prepared in (1) into beaker (2), and place beaker (2) in a 90℃ oil bath and set the stirrer speed to 100 rpm.

[0055] (4) Add 5g of acetylacetone peroxide and 2g of cobalt naphthenate to the beaker in (2) one after the other. After 20 minutes, a self-supported solid phase with a main separation particle size of 6 / 20 mesh is obtained. Figure 1 As shown in (a).

[0056] Example 2

[0057] This embodiment describes a self-supporting fracturing fluid system prepared with saline lake water, including the following steps:

[0058] (1) Add 20g of melamine, 20g of diallyl melamine, 60g of bisphenol A epoxy resin and 10g of ethylene glycol to a 500mL beaker, and start stirring until the solution is completely clear and transparent.

[0059] (2) Add 1500g of salt lake water (parameters as shown in Table 1), 1510g of octylphenol polyoxyethylene ether-15, 7g of activated carbon, 1.5g of cationic polyacrylamide, and 5g of dodecyltrimethylammonium chloride to a 2L beaker, and start stirring until the solution is completely clear and transparent.

[0060] (3) Pour the solution prepared in (1) into beaker (2), and place beaker (2) in a 90℃ oil bath, and set the stirrer speed to 200 rpm.

[0061] (4) Pour 5g of diphenoxyethyl peroxide dicarbonate into the beaker in (2), and after 20 minutes, a self-supported solid phase with a main sorting particle size of 20 / 40 mesh is obtained, as shown in the figure. Figure 1 As shown in (b).

[0062] Example 3

[0063] This embodiment describes a self-supporting fracturing fluid system prepared with salt lake water, including the following steps:

[0064] (1) Add 20g of melamine to a 500mL beaker. 、 Add 30g of tetraallyl melamine, 50g of phenolic epoxy vinyl ester, and 15g of N,N-dimethylformamide. Stir until the solution is completely clear and transparent.

[0065] (2) Add 2000g of salt lake water (parameters as shown in Table 1), 15g of sodium dodecyl sulfate, 3g of acrylamide-dimethyldiallyl ammonium chloride, 2g of cationic polyacrylamide, and 10g of tetradecyl dimethyl benzyl ammonium chloride to a 2L beaker, and start stirring until the solution is completely clear and transparent.

[0066] (3) Pour the solution prepared in (1) into beaker (2), and place beaker (2) in a 90℃ oil bath, and set the stirrer speed to 200 rpm.

[0067] (4) Pour 5g of tert-butyl peroxide into the beaker in (2), and after 20 minutes, a self-supported solid phase with a main sorting particle size of 40 / 70 mesh is obtained, as shown below. Figure 1 As shown in (c).

[0068] Example 4

[0069] This embodiment describes a self-supporting fracturing fluid system prepared with seawater, including the following steps:

[0070] (1) Add 20g of melamine, 30g of triallyl isocyanurate, 50g of phenolic epoxy vinyl ester and 10g of ethylene glycol to a 500mL beaker, and start stirring until the solution is completely clear and transparent.

[0071] (2) Add 2000g of seawater (parameters as shown in Table 1), 15g of sodium dodecylbenzenesulfonate, 5g of acrylamide-diethyldiallylammonium chloride, 1.5g of cationic polyacrylamide, and 10g of tetradecyl dimethyl benzyl ammonium chloride to a 2L beaker, and start stirring until the solution is completely clear and transparent.

[0072] (3) Pour the solution prepared in (1) into beaker (2), and place beaker (2) in a 90℃ oil bath and set the stirrer speed to 400 rpm.

[0073] (4) 1 g of tert-butyl peroxide was poured into the beaker in (2), and after 20 min, a self-supported solid phase with a main sorting particle size of 70 / 140 mesh was obtained, as shown in the figure. Figure 1 As shown in (d).

[0074] The preparation methods of Examples 5-12 are the same as those of Examples 1-4, except that the components and stirring conditions of the self-supporting fracturing fluid system are different, as shown in Table 3.

[0075] Table 3

[0076]

[0077]

[0078]

[0079] According to the "Test Method for Performance of Proppants for Hydraulic Fracturing and Gravel Packing Operations" (SY / T 5108-2014), the self-supporting solid phase fragmentation rates of self-supporting fracturing fluids prepared from different water sources in Examples 1-12 were measured and are shown in Table 4. Figure 2 As shown, it can be seen that the self-supporting solid phase formed after solidification of self-supporting fracturing fluid systems prepared using seawater, salt lake water, or saline lake water all possess excellent anti-fracture properties.

[0080] Table 4. Fracture rate of self-supporting solid phase formed by solidification of self-supporting fracturing fluids prepared from different water sources.

[0081]

[0082] According to the "Test Method for Performance of Proppants for Hydraulic Fracturing and Gravel Packing Operations" (SY / T 5108-2014), the industry-recommended standard for the crushing rate of ceramsite is specified, as shown in Table 5.

[0083] Table 5. Crush Rate of Ceramsite (Industry Standard)

[0084] Ceramic particle size Closed stress ceramsite breakage rate, % 6 / 20 mesh 52MPa 25 20 / 40 mesh 52MPa 9 40 / 70 mesh 86MPa 10 70 / 140 mesh 86MPa 10

[0085] Compared to the standard breakage rate of ceramsite, the self-supporting solid phase obtained by this invention has an average breakage rate that is more than 40% lower. Due to the extremely low breakage rate of the self-supporting solid phase, the accumulation of broken solids in cracks after migration is greatly avoided, thus preventing a reduction in the crack's conductivity and helping to extend the effective period of construction.

[0086] Comparative Example 1

[0087] The difference between this embodiment and Embodiment 1 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (melamine (20g), triallyl isocyanurate (30g), epoxy resin (50g)), 10 parts of organic solvent (N-vinylpyrrolidone (10g)), 10 parts of curing accelerator (acetylacetone peroxide (5g), cobalt naphthenate (5g)), 5 parts of dispersant (dodecylphenol polyoxyethylene ether-10 (5g)), 1 part of drag reducer (cationic polyacrylamide (1g)), 5 parts of flocculant (polyalumina (5g)), 5 parts of bactericide (tetradecyl dimethyl benzyl ammonium chloride (5g)), and 1000g of seawater. The steps are the same as in Embodiment 1, forming a self-supporting solid phase as shown in the figure. Figure 3 As shown, the product particles are stuck together and it is difficult to form spherical small particles.

[0088] Comparative Example 2

[0089] The difference between this embodiment and Example 1 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (melamine (20g), triallyl isocyanurate (30g), epoxy resin (50g)), 10 parts of organic solvent (N-vinylpyrrolidone (10g)), 0.01 parts of curing accelerator (acetylacetone peroxide (0.01g)), 0.01 parts of dispersant (dodecylphenol polyoxyethylene ether-10 (0.01g)), 1 part of drag reducer (cationic polyacrylamide (1g)), 5 parts of flocculant (polyalumina (5g)), 0.5 parts of bactericide (tetradecyl dimethyl benzyl ammonium chloride (0.5g)), and 1000g of seawater. The steps are the same as in Example 1, forming a self-supporting solid phase as shown in Example 1. Figure 4 As shown, the product is clumped and unevenly formed.

[0090] Comparative Example 3

[0091] The difference between this embodiment and Embodiment 1 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (melamine (20g), triallyl isocyanurate (30g), epoxy resin (50g)), 10 parts of organic solvent (N-vinylpyrrolidone (10g)), 5 parts of dispersant (dodecylphenol polyoxyethylene ether-10 (5g)), 1 part of drag reducer (cationic polyacrylamide (1g)), 5 parts of bactericide (tetradecyl dimethyl benzyl ammonium chloride (5g)), and 1000g of seawater. The steps are the same as in Embodiment 1, forming a self-supporting solid phase as shown in the figure. Figure 5 As shown, the product clumps together and cannot form uniform particles.

[0092] Comparative Example 4

[0093] The difference between this embodiment and Embodiment 3 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (phenolic epoxy vinyl ester resin (100g)), 10 parts of organic solvent (N,N-dimethylformamide (15g)), 5 parts of curing accelerator (tert-butyl peroxide (5g)), 15 parts of dispersant (sodium dodecyl sulfate (15g)), 2 parts of drag reducer (cationic polyacrylamide (2g)), 3 parts of flocculant (acrylamide-dimethyldiallyl ammonium chloride (3g)), 10 parts of bactericide (tetradecyl dimethyl benzyl ammonium chloride (10g)), and 2000g of salt lake water. The steps are the same as in Embodiment 3, but the resulting self-supporting solid phase has an excessively high breakage rate, such as... Figure 6 As shown.

[0094] Comparative Example 5

[0095] The difference between this embodiment and Embodiment 3 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (40g diallyl melamine, 59.5g tetraallyl melamine, 0.5g phenolic epoxy vinyl ester resin), 10 parts of organic solvent (15g N,N-dimethylformamide), 5 parts of curing accelerator (5g tert-butyl peroxide), 15 parts of dispersant (15g sodium dodecyl sulfate), 2 parts of drag reducer (2g cationic polyacrylamide), 3 parts of flocculant (3g acrylamide-dimethyl diallyl ammonium chloride), 10 parts of bactericide (10g tetradecyl dimethyl benzyl ammonium chloride), and 2000g of salt lake water. The steps are the same as in Embodiment 3, but the resulting self-supporting solid phase has an excessively high breakage rate. Figure 6 As shown.

[0096] Comparative Example 6

[0097] The difference between this embodiment and Embodiment 3 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (0.2g diallyl melamine, 0.3g tetraallyl melamine, 99.5g phenolic epoxy vinyl ester resin)), 10 parts of organic solvent (15g N,N-dimethylformamide)), 5 parts of curing accelerator (5g tert-butyl peroxide)), 15 parts of dispersant (15g sodium dodecyl sulfate)), 2 parts of drag reducer (2g cationic polyacrylamide)), 3 parts of flocculant (3g acrylamide-dimethyl diallyl ammonium chloride), 10 parts of bactericide (10g tetradecyl dimethyl benzyl ammonium chloride), and 2000g of salt lake water. The steps are the same as in Embodiment 3, but the resulting self-supporting solid phase has an excessively high breakage rate. Figure 6 As shown.

[0098] Comparative Example 7

[0099] The difference between this embodiment and Embodiment 3 is that the components of the self-supporting fracturing fluid system are as follows: 100 parts of phase change agent (40g diallyl melamine, 60g tetraallyl melamine)), 10 parts of organic solvent (15g N,N-dimethylformamide)), 5 parts of curing accelerator (5g tert-butyl peroxide)), 15 parts of dispersant (15g sodium dodecyl sulfate)), 2 parts of drag reducer (2g cationic polyacrylamide)), 3 parts of flocculant (3g acrylamide-dimethyl diallyl ammonium chloride), 10 parts of bactericide (10g tetradecyl dimethyl benzyl ammonium chloride), and 2000g of salt lake water. The steps are the same as in Embodiment 3, but the resulting self-supporting solid phase has an excessively high breakage rate. Figure 6 As shown.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A self-supporting fracturing fluid system that can be prepared using various natural brine solutions, characterized in that: This includes phase change agents, organic solvents, curing accelerators, dispersants, drag reducers, flocculants, bactericides, and brine; The composition, based on the mass fractions of the raw materials, includes 10-100 parts of the phase change agent, 1-20 parts of the organic solvent, 0.1-5 parts of the curing accelerator, 0.1-10 parts of the dispersant, 0.1-2 parts of the drag-reducing agent, 0.1-10 parts of the flocculant, 1-10 parts of the bactericide, and 100-2000 parts of the brine. The phase change agent includes phase change agent A and phase change agent B; Wherein, phase change agent A is one or more of diallyl melamine, triallyl melamine, tetraallyl melamine, pentaallyl melamine, hexaallyl melamine, melamine, and triallyl isocyanurate; Phase change agent B is one or more of the following: bisphenol S epoxy resin, bisphenol A epoxy resin, phenolic epoxy vinyl ester resin, bisphenol A type cyanate resin, pyrphenol A type cyanate resin, and dicyclopentadienol type cyanate resin. The mass ratio of phase change agent A to phase change agent B is 1:100 to 100:

1. The flocculant is one or more of the following: polyalumina, activated carbon, acrylamide-dimethyldiallylammonium chloride, acrylamide-diethyldiallylammonium chloride, acrylamide-acrylamido-2-methylpropanesulfonic acid, and anionic polyacrylamide. The drag-reducing agent is at least one of cationic polyacrylamide, poly(2-acrylamide-2-methyl-1-propanesulfonic acid), sodium acrylate and acrylamide copolymer, and perfluoromethacrylate copolymer. The self-supporting fracturing fluid system is used to prepare a self-supporting solid phase, and the particle size of the obtained self-supporting solid phase ranges from 6 to 140 mesh.

2. The self-supporting fracturing fluid system as described in claim 1, characterized in that: The organic solvent is one or more of N-vinylpyrrolidone, ethylene glycol, and N,N-dimethylformamide.

3. The self-supporting fracturing fluid system as described in claim 1, characterized in that: The curing accelerator is one or more of the following: methyl ethyl ketone peroxide, cumene hydroperoxide, acetylacetone peroxide, cyclohexanone peroxide, cobalt naphthenate, 4-tert-butylcyclohexyl ester, diphenoxyethyl percarbonate, tert-butyl peroxyoctanoate, tert-butyl peroxybenzoate, and azobisisobutyronitrile.

4. The self-supporting fracturing fluid system as described in claim 1, characterized in that: The dispersant is at least one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, dodecylphenol polyoxyethylene ether-10, octylphenol polyoxyethylene ether-15, polyacrylic acid, and polyvinyl alcohol.

5. The self-supporting fracturing fluid system as described in claim 1, characterized in that: The bactericide is dodecyltrimethylammonium chloride or tetradecyldimethylbenzylammonium chloride.

6. The self-supporting fracturing fluid system as described in claim 1, characterized in that: The method for preparing the self-supporting solid phase includes, Mix the phase change agent and organic solvent evenly and stir until the solution is clear and transparent to obtain component A; Mix natural brine, flocculant, dispersant, drag reducer, and bactericide evenly and stir until the solution is clear and transparent to obtain component B; Take the supernatant from B, mix it with component A, and stir in an oil bath to obtain component C; Adding a curing accelerator to component C and reacting for a period of time yields a self-supporting solid phase.

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