Soluble rubber composition as well as preparation method and application thereof
By introducing sulfonate groups and Diels-Alder bonds into soluble rubber materials, a soluble rubber composition that maintains strength at high temperatures and degrades rapidly downhole is prepared. This solves the problems of insufficient strength and slow degradation of existing materials under high temperature and high pressure, and achieves efficient operation and residue-free fracturing tools.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-04-10
AI Technical Summary
Existing soluble rubber materials are difficult to maintain mechanical strength and sealing integrity under high temperature and pressure. They also degrade rapidly after operation and are difficult to completely dissolve in high-mineralization brine environments, affecting fracturing efficiency and downhole flow channel unobstructedness.
By introducing sulfonate groups and Diels-Alder bonds, the reactivity of dienophiles and the heat resistance of chain extenders are improved. Combined with imide structures, the material can maintain its strength and degrade rapidly at high temperatures. Soluble rubber compositions are prepared by reacting compounds such as vinyl sulfonyl chloride, polyols, and 4,5-dichloromethyl phthalic anhydride.
It maintains excellent mechanical strength and sealing performance under high temperature and pressure, while rapidly degrading in complex downhole fluid environments, ensuring efficient operation and residue-free fracturing tools.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of rubber technology, specifically relating to a soluble rubber composition, its preparation method, and its application. Background Technology
[0002] Rubber is a high-performance non-metallic additive material widely used in oil and gas well fracturing tools. Horizontal well staged fracturing is a key technology for improving unconventional oil and gas production. Current staged fracturing technology requires drilling and milling to remove the rubber seals after fracturing, a complex and time-consuming process that significantly impacts fracturing efficiency. In recent years, domestic and international research has focused on developing soluble rubber sealing materials to achieve interference-free well completion tooling. Developing high-performance soluble rubber sealing materials is of great significance in oilfield engineering.
[0003] Ideally, soluble rubber for fracturing tools must simultaneously meet three stringent requirements: First, it must maintain extremely high mechanical strength and sealing integrity during fracturing operations (typically lasting several days, with downhole temperatures reaching 120-150°C and pressures exceeding 70 MPa); second, it must be able to be activated as needed after the operation, rapidly and thoroughly degrading to prevent residues from clogging the production flow channels; and third, its degradation behavior must be adaptable to complex downhole fluid environments (such as highly saline solutions). However, existing soluble rubber materials often struggle to achieve these properties simultaneously. Most current mainstream soluble rubbers are based on polyesters (such as polylactic acid (PLA) and polyglycolic acid (PGA)) or hydrolyzable polyurethane systems. Their degradation mechanism relies on the hydrolysis of ester bonds in the polymer backbone. To obtain sufficient initial strength, the material needs a high molecular weight and crosslinking density, but this significantly slows down the rate of water molecule penetration and ester bond breakage, resulting in excessively long degradation times (up to tens of days or even months), failing to meet the demands of efficient operations. Conversely, if too many easily hydrolyzable segments are introduced or the degree of crosslinking is reduced in order to increase the degradation rate, the short-term mechanical properties and creep resistance of the material under high temperature and high pressure will be severely sacrificed, posing a significant risk of premature failure during fracturing. To address the above technical defects, this invention provides a soluble rubber composition and its preparation method, developing a novel soluble rubber material that combines excellent high-temperature mechanical properties, precise and controllable degradation behavior (especially stability at high temperatures and rapid triggering in brine environments), and complete dissolution without residue. This has urgent practical significance and important engineering value for promoting the development of high-end fracturing tools and adapting to more severe oil and gas extraction conditions. Summary of the Invention
[0004] The purpose of this invention is to provide a soluble rubber composition, its preparation method, and its application, in order to solve the problems mentioned in the background art.
[0005] The objective of this invention can be achieved through the following technical solutions:
[0006] A method for preparing a soluble rubber composition includes the following steps:
[0007] The first step involves esterifying vinyl sulfonyl chloride with a polyol to obtain a dienophile.
[0008] The reaction process is as follows: vinyl sulfonyl chloride, polyol, triethylamine and tetrahydrofuran are mixed in a reaction vessel and reacted at room temperature for 30-60 min. After the reaction is completed, the reaction solution is poured into deionized water and extracted with dichloromethane. Then the organic phase is separated and evaporated to dryness to obtain the dienophile.
[0009] The second step involves reacting 4,5-dichloromethyl phthalic anhydride with 3-furanylmethylamine via an imidization reaction, followed by hydrolysis under alkaline conditions to obtain a diene.
[0010] The reaction process is as follows: 4,5-dichloromethylphthalic anhydride, 3-furanylmethylamine, and N,N-dimethylformamide are mixed in a reaction vessel and reacted at 80–100°C for 3–6 h. After that, the reaction solution is poured into deionized water, the solid is separated by filtration, and the obtained solid is added to a 10–20% sodium carbonate aqueous solution and reacted at 60–80°C for 6–12 h. After the reaction is completed, the solid is separated by filtration, washed with deionized water, and dried to obtain the diene.
[0011] The third step involves reacting the dienophile with the diene via a Diels-Alder reaction to obtain a chain extender.
[0012] The reaction process is as follows: The dienophile, diene, and N,N-dimethylformamide are mixed in a reaction vessel and reacted at 60–80 °C for 4–10 h. After the reaction is complete, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain the chain extender.
[0013] The fourth step involves mixing and reacting polyester polyol, polyisocyanate, chain extender, and functional additives, then adding a vulcanizing agent to the system, and finally obtaining a soluble rubber composition after vulcanization.
[0014] Furthermore, the polyol is one of ethylene glycol, 1,2-propanediol, and 1,3-propanediol.
[0015] Furthermore, the polyester polyol is one of polycaprolactone diol and polycarbonate diol.
[0016] Furthermore, the polyisocyanate is one of 4,4'-diphenylmethane diisocyanate and terephthalic diisocyanate.
[0017] Furthermore, the functional additive is one of antioxidants and lubricants.
[0018] Furthermore, the vulcanizing agent is one of 3,3'-dichloro-4,4'-diphenylmethanediamine and dimethylthiotoluenediamine.
[0019] Furthermore, the mixing reaction is carried out at a temperature of 100–120°C for 1.5–2.5 h, and the vulcanization molding is carried out at a temperature of 110–130°C for 12–24 h.
[0020] Furthermore, the mass ratio of the polyester polyol, polyisocyanate, chain extender, functional additives, and vulcanizing agent used is 100:25-35:16-18:1-3:10-18.
[0021] A soluble rubber composition is prepared by any of the above steps.
[0022] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0023] The beneficial effects of this invention are:
[0024] 1) This invention introduces sulfonate groups into the dienophile of the chain extender. The sulfonate groups have a strong electron-withdrawing effect, which can not only improve the reactivity of the dienophile and the heat resistance of the obtained Diels-Alder bond, but also hydrolyze to generate hydrophilic sulfonate groups during the dissolution process, attract water molecules, accelerate the penetration of water into the interior of the material, improve the rubber dissolution rate of soluble rubber, and achieve rapid dissolution.
[0025] 2) The present invention introduces Diels-Alder bonds into the chain extender. Diels-Alder bonds can break and recombine during vulcanization, effectively eliminating internal stress and improving the tensile strength and elongation at break of the soluble rubber composition.
[0026] 3) This invention introduces Diels-Alder bonds into the chain extender, and also introduces heat-resistant imide and sulfonate structures into the chain extender, which greatly increases the reverse reaction decomposition temperature of the Diels-Alder bonds. While effectively ensuring the strength of the soluble rubber at the working temperature, it also enables the soluble rubber to degrade rapidly after the action is completed. Detailed Implementation
[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0028] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.
[0029] It should be understood that the use of “including,” “having,” or “containing,” including its grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.
[0030] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.
[0031] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.
[0032] Example 1
[0033] A method for preparing a soluble rubber composition includes the following steps:
[0034] Step 1: Mix 15.8 parts by mass of vinyl sulfonyl chloride, 8.6 parts by mass of ethylene glycol, 12 parts by mass of triethylamine and 150 parts by mass of tetrahydrofuran in a reaction vessel and react at room temperature for 60 min. After the reaction is completed, pour the reaction solution into deionized water and extract with dichloromethane. Then separate the organic phase and evaporate the organic phase to obtain the dienophile.
[0035] Step 2: According to the mass fraction, 30.6 parts of 4,5-dichloromethylphthalic anhydride, 12.6 parts of 3-furanylmethylamine, and 160 parts of N,N-dimethylformamide were mixed in a reaction vessel and reacted at 80°C for 6 hours. After that, the reaction solution was poured into deionized water, and the solid was separated by filtration. The obtained solid was added to 200 parts of 20% sodium carbonate aqueous solution and reacted at 60°C for 12 hours. After the reaction was completed, the solid was separated by filtration, washed with deionized water, and dried to obtain the diene.
[0036] Step 3: According to the mass fraction, 15.2 parts of dienophile, 28.7 parts of dienophile, and 160 parts of N,N-dimethylformamide are mixed in a reaction vessel and reacted at 60℃ for 10 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain the chain extender.
[0037] Step 4: By mass, mix 100 parts of polycaprolactone diol, 25 parts of terephthalic diisocyanate, 18 parts of chain extender, 0.2 parts of antioxidant 1010, and 0.8 parts of zinc stearate, and react at 100°C for 2.5 hours. Then, add 10 parts of 3,3'-dichloro-4,4'-diphenylmethane diamine to the system and react at 110°C for 24 hours. After molding, a soluble rubber composition is obtained.
[0038] A soluble rubber composition is prepared by any of the above steps.
[0039] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0040] Example 2
[0041] A method for preparing a soluble rubber composition includes the following steps:
[0042] Step 1: According to the mass fractions, 15.8 parts of vinylsulfonyl chloride, 10.6 parts of 1,2-propanediol, 15 parts of triethylamine, and 150 parts of tetrahydrofuran were mixed in a reaction vessel and reacted at room temperature for 30 min. After the reaction was completed, the reaction solution was poured into deionized water and extracted with dichloromethane. Then, the organic phase was separated and evaporated to dryness to obtain the dienophile.
[0043] Step 2: According to the mass fraction, 30.6 parts of 4,5-dichloromethylphthalic anhydride, 12.6 parts of 3-furanylmethylamine, and 160 parts of N,N-dimethylformamide were mixed in a reaction vessel and reacted at 90°C for 4.5 hours. After that, the reaction solution was poured into deionized water, and the solid was separated by filtration. The obtained solid was added to 300 parts of 15% sodium carbonate aqueous solution and reacted at 70°C for 9 hours. After the reaction was completed, the solid was separated by filtration, washed with deionized water, and dried to obtain the diene.
[0044] Step 3: According to the mass fraction, 16.4 parts of dienophile, 28.7 parts of dienophile, and 160 parts of N,N-dimethylformamide are mixed in a reaction vessel and reacted at 75°C for 7 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain the chain extender.
[0045] Step 4: By mass, mix 100 parts of polycarbonate diol, 30 parts of 4,4'-diphenylmethane diisocyanate, 17 parts of chain extender, 0.5 parts of antioxidant 1035, and 1.5 parts of stearamide, and react at 110°C for 2 hours. Then, add 14 parts of dimethylthiotoluene diamine to the system and react at 120°C for 18 hours. After molding, a soluble rubber composition is obtained.
[0046] A soluble rubber composition is prepared by any of the above steps.
[0047] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0048] Example 3
[0049] A method for preparing a soluble rubber composition includes the following steps:
[0050] Step 1: According to the mass fractions, 15.8 parts of vinylsulfonyl chloride, 10.6 parts of 1,3-propanediol, 18 parts of triethylamine, and 150 parts of tetrahydrofuran were mixed in a reaction vessel and reacted at room temperature for 45 min. After the reaction was completed, the reaction solution was poured into deionized water and extracted with dichloromethane. Then, the organic phase was separated and evaporated to dryness to obtain the dienophile.
[0051] Step 2: According to the mass fraction, 30.6 parts of 4,5-dichloromethylphthalic anhydride, 12.6 parts of 3-furanylmethylamine, and 160 parts of N,N-dimethylformamide were mixed in a reaction vessel and reacted at 100℃ for 3 hours. After that, the reaction solution was poured into deionized water, and the solid was separated by filtration. The obtained solid was added to 400 parts of 10% sodium carbonate aqueous solution and reacted at 80℃ for 6 hours. After the reaction was completed, the solid was separated by filtration, washed with deionized water, and dried to obtain the diene.
[0052] Step 3: According to the mass fraction, 16.4 parts of dienophile, 28.7 parts of dienophile, and 160 parts of N,N-dimethylformamide are mixed in a reaction vessel and reacted at 90℃ for 4 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain the chain extender.
[0053] Step 4: By mass, mix 100 parts of polycaprolactone diol, 35 parts of 4,4'-diphenylmethane diisocyanate, 16 parts of chain extender, 1 part of antioxidant 1076, and 2 parts of oleamide, and react at 120°C for 1.5 hours. Then, add 18 parts of 3,3'-dichloro-4,4'-diphenylmethane diamine to the system and react at 130°C for 12 hours. After molding, a soluble rubber composition is obtained.
[0054] A soluble rubber composition is prepared by any of the above steps.
[0055] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0056] Example 4
[0057] A method for preparing a soluble rubber composition includes the following steps:
[0058] Step 1: According to the mass fractions, 15.8 parts of vinylsulfonyl chloride, 10.6 parts of 1,3-propanediol, 18 parts of triethylamine, and 150 parts of tetrahydrofuran were mixed in a reaction vessel and reacted at room temperature for 45 min. After the reaction was completed, the reaction solution was poured into deionized water and extracted with dichloromethane. Then, the organic phase was separated and evaporated to dryness to obtain the dienophile.
[0059] Step 2: According to the mass fraction, 30.6 parts of 4,5-dichloromethylphthalic anhydride, 12.6 parts of 3-furanylmethylamine, and 160 parts of N,N-dimethylformamide were mixed in a reaction vessel and reacted at 90°C for 4.5 hours. After that, the reaction solution was poured into deionized water, and the solid was separated by filtration. The obtained solid was added to 400 parts of a 10% sodium carbonate aqueous solution and reacted at 80°C for 6 hours. After the reaction was completed, the solid was separated by filtration, washed with deionized water, and dried to obtain the diene.
[0060] Step 3: According to the mass fraction, 16.4 parts of dienophile, 28.7 parts of dienophile, and 160 parts of N,N-dimethylformamide are mixed in a reaction vessel and reacted at 90℃ for 4 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain the chain extender.
[0061] Step 4: By mass, mix 100 parts of polycarbonate diol, 32 parts of terephthalic diisocyanate, 17 parts of chain extender, 1.2 parts of antioxidant 1010, and 1.8 parts of calcium stearate, and react at 115°C for 2 hours. Then, add 18 parts of 3,3'-dichloro-4,4'-diphenylmethane diamine to the system and react at 125°C for 14 hours. After molding, a soluble rubber composition is obtained.
[0062] A soluble rubber composition is prepared by any of the above steps.
[0063] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0064] Comparative Example 1
[0065] A method for preparing a soluble rubber composition includes the following steps:
[0066] Step 1: According to the mass fractions, 15.8 parts of vinylsulfonyl chloride, 10.6 parts of 1,3-propanediol, 18 parts of triethylamine, and 150 parts of tetrahydrofuran were mixed in a reaction vessel and reacted at room temperature for 45 min. After the reaction was completed, the reaction solution was poured into deionized water and extracted with dichloromethane. Then, the organic phase was separated and evaporated to dryness to obtain the dienophile.
[0067] Step 2: According to the mass fraction, 16.4 parts of dienophile, 9.8 parts of 3-furan methanol and 160 parts of N,N-dimethylformamide are mixed in a reaction vessel and reacted at 90℃ for 4 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain the chain extender.
[0068] Step 3: By mass, 100 parts of polycaprolactone diol, 35 parts of 4,4'-diphenylmethane diisocyanate, 16 parts of chain extender, 1 part of antioxidant 1076, and 2 parts of oleamide are mixed and reacted at 120°C for 1.5 hours. Then, 18 parts of 3,3'-dichloro-4,4'-diphenylmethane diamine are added to the system and reacted at 130°C for 12 hours. After molding, a soluble rubber composition is obtained.
[0069] A soluble rubber composition is prepared by any of the above steps.
[0070] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0071] Comparative Example 2
[0072] The difference between this comparative example and Example 1 is that, instead of preparing an additional chain extender, an equal mass of commercially available chain extender dimethylolpropionic acid is used.
[0073] A method for preparing a soluble rubber composition includes the following steps:
[0074] By weight, 100 parts of polycaprolactone diol, 25 parts of terephthalic diisocyanate, 18 parts of commercially available chain extender dimethylolpropionic acid, 0.2 parts of antioxidant 1010, and 0.8 parts of zinc stearate were mixed and reacted at 100°C for 2.5 h. Then, 10 parts of 3,3'-dichloro-4,4'-diphenylmethanediamine were added to the system and reacted at 110°C for 24 h. After molding, a soluble rubber composition was obtained.
[0075] A soluble rubber composition is prepared by any of the above steps.
[0076] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0077] Comparative Example 3
[0078] The difference between this comparative example and Example 2 is that, instead of preparing an additional chain extender, an equal mass of commercially available chain extender dimethylolpropionic acid is used.
[0079] A method for preparing a soluble rubber composition includes the following steps:
[0080] By mass, 100 parts of polycarbonate diol, 30 parts of 4,4'-diphenylmethane diisocyanate, 17 parts of chain extender dimethylolpropionic acid, 0.5 parts of antioxidant 1035, and 1.5 parts of stearamide were mixed and reacted at 110°C for 2 hours. Then, 14 parts of dimethylthiotoluene diamine were added to the system and reacted at 120°C for 18 hours. After molding, a soluble rubber composition was obtained.
[0081] A soluble rubber composition is prepared by any of the above steps.
[0082] Application of a soluble rubber composition, specifically its application in the field of oil and gas well fracturing tools.
[0083] Experimental Example 1
[0084] The soluble rubber compositions obtained in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests. The tensile strength and elongation at break of each component of the soluble rubber composition were tested according to the national standard GB / T528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber". The pressure-bearing sealing performance of each component of the soluble rubber composition under a pressure of 100 MPa and a temperature of 150℃ was tested according to the industry standard NB / T 14020.2-2020 "Shale Gas Tools and Equipment Part 2: Testing and Operation Specifications for Fracturing Soluble Bridge Plugs". The solubility of each component of the rubber composition in 1% sodium chloride solution at 120℃ and the dissolution rate in a simulated surface water environment were also tested. The test results are shown in Table 1.
[0085] Table 1
[0086]
[0087] As can be seen from Table 1, the soluble rubber compositions of the present invention in Examples 1 to 4 have better tensile strength and elongation at break, while also ensuring strength and excellent degradation rate at working temperature. In Comparative Example 1, no aromatic ring and imide ring were introduced into the diene structure. It can be seen that the heat resistance of the Diels-Alder bond is significantly reduced. Although it has a faster dissolution rate, leakage will occur during high-temperature pressure sealing.
[0088] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
Claims
1. A method for producing a soluble rubber composition, characterized by, The method comprises the following steps: The first step is to esterify vinyl sulfonyl chloride with polyhydric alcohol to obtain a dienophile; The second step is to acylate 4,5-dichloromethyl phthalic anhydride with 3-furylmethylamine, and then hydrolyze under alkaline conditions to obtain a diene; The third step is to carry out a Diels-Alder reaction between the dienophile and the diene to obtain a chain extender; The fourth step is to mix polyester polyol, polyisocyanate, chain extender and functional additive, and then add vulcanizing agent to the system, and after vulcanization and molding, a soluble rubber composition is obtained.
2. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber and the solvent at a temperature of 100°C or higher. The polyhydric alcohol is one of ethylene glycol, 1,2-propanediol and 1,3-propanediol.
3. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber, the solvent, and the at least one additive. The polyester polyol is one of polycaprolactone diol and polycarbonate diol.
4. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber, the solvent, and the additive. 5 The polyisocyanate is one of 4,4'-diphenyl methane diisocyanate and p-phenylene diisocyanate.
5. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber, the solvent, and the additive. The functional additive is one of antioxidant and lubricant.
6. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber, the solvent, and the at least one additive. The vulcanizing agent is one of 3,3'-dichloro-4,4'-diphenyl methane diamine and dimethyl sulfide toluene diamine.
7. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber, the solvent, and the at least one additive. The mixing reaction is carried out at a temperature of 100-120℃ for 1.5-2.5h, and the vulcanization molding is carried out at a temperature of 110-130℃ for 12-24h.
8. The method of claim 1, wherein the soluble rubber composition is prepared by mixing the rubber, the solvent, and the at least one additive. The mass ratio of polyester polyol, polyisocyanate, chain extender, functional additive and vulcanizing agent is 100:25-35:16-18:1-3:10-18.
9. The soluble rubber composition obtained by the preparation method of claim 1.
10. The application of the soluble rubber composition of claim 9 in the field of oil and gas well fracturing tools.