Resin system for pore-enlarging and sand consolidation of automatic gas generation and preparation method of resin system

Abstract

The invention belongs to the technical field of oilfield chemistry, and particularly relates to a resin system for pore-enlarging and sand consolidation of automatic gas generation and a preparation method thereof. The resin system for pore broadening and sand consolidation of automatic gas generation comprises resin, a curing agent, a control agent, a reinforcing agent, a gas generation agent and water. The resin system for pore broadening and sand consolidation through automatic gas generation is low in viscosity, is not solidified under the low-temperature condition, can be injected in an integrated mode and is convenient to construct, a gas generating agent generates a large amount of harmless gas (nitrogen) under the stratum condition, a seepage channel is reserved, and the retention rate of the permeability of a consolidated body is high.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a resin system for self-generating gas pore expansion and sand consolidation and a preparation method thereof. Background Art

[0002] With the further development of oil fields, the sand production problem is becoming more and more serious. Mechanical sand control cannot fundamentally solve the sand production problem in reservoirs. It has poor sand control effect on fine silt, cannot consolidate sand particles, and has a short effective period. Chemical sand control technology has the advantages of strong formation adaptability, fine silt control, no mechanical devices, and simple construction technology. However, the current chemical sand control system has high density and high viscosity, which seriously affects the pumpability of the chemical sand control system into the formation. In addition, there are problems such as complex construction and low retention rate of consolidated body permeability during oil field operations.

[0003] The Chinese invention patent with application number 201510704656.6 discloses a new type of low-temperature coated sand, which is composed of two components A and B in a weight ratio of 1:1, wherein component A includes: quartz sand, binder, coupling agent, dispersant and accelerator; component B includes: quartz sand, curing agent, coupling agent, dispersant and accelerator. Effect of the invention: fast curing speed, high early strength, and wide applicable oil layer temperature range. The product can produce high early strength in 24 hours under 45-260℃. The waiting time is short. However, the permeability retention rate of the formed solid body is low.

[0004] The Chinese invention patent with application number 201010004611.5 discloses a coated sand curing system suitable for sand control in low-temperature oil reservoirs. The system is a curing system with high reactivity in water environment and low temperature conditions, which is composed of low-temperature coated sand with composite phenolic-epoxy resin as a binder and a water-soluble curing agent. Under the action of the water-soluble curing agent, the low-temperature coated sand can be cured in the temperature range of 30 to 50°C. The formed solidified body has high compressive strength and permeability retention rate, and has strong heat resistance, aging resistance and scour resistance, which can meet the requirements of sand control in low-temperature oil reservoirs. However, the sand consolidation system is solidified at low temperature. For sand control of filling the depleted formation, it has been solidified before being injected into the formation. Therefore, it cannot be directly injected into the formation for formation sand consolidation. Summary of the invention

[0005] In view of the defects of the prior art, the present invention provides a resin system for self-generating pore expansion and sand consolidation and a preparation method thereof.

[0006] Specifically, the resin system for self-generating pore expansion and sand consolidation provided by the present invention includes: resin, curing agent, control agent, reinforcing agent, gas generating agent and water.

[0007] The above-mentioned resin system for self-generating pore expansion and sand consolidation includes, based on 100 parts by total weight, 16-20 parts of resin, 10-14 parts of curing agent, 2-3 parts of control agent, 1-3 parts of reinforcing agent, 5-7 parts of gas generating agent, and the balance is water.

[0008] The above-mentioned resin system for self-generating pore expansion and sand consolidation includes, based on 100 parts by total weight, 18 parts of resin, 12 parts of curing agent, 2.5 parts of control agent, 2 parts of reinforcing agent, 6 parts of gas generating agent, and the balance is water.

[0009] The resin system for self-generating pore expansion and sand consolidation is a guaiacol / maleic anhydride binary copolymer.

[0010] The above-mentioned resin system for self-generating pore expansion and sand consolidation, the curing agent is 4,4-diaminodiphenylmethane.

[0011] In the above-mentioned resin system for self-generating pore expansion and sand consolidation, the controlling agent is citric acid.

[0012] In the above-mentioned resin system for self-generating pore expansion and sand consolidation, the reinforcing agent is polyetheramine D230.

[0013] The above-mentioned resin system for self-generating gas pore expansion and sand consolidation, the gas generating agent is prepared by the following method:

[0014] (1) adding microporous silica microspheres to a mixture of ethanol and water, adding KH-550 to the suspension of microporous silica microspheres, and ultrasonically treating to obtain a mixture;

[0015] (2) The mixture is stirred, filtered, and dried to obtain microporous silica microspheres-KH-550;

[0016] (3) adding benzenesulfonyl hydrazide to N,N-dimethylformamide solution, adding the microporous silica microspheres-KH-550, and stirring;

[0017] (4) The supernatant was discarded, the precipitate was collected, washed with methanol and then filtered to obtain a spherical solid particle gas generating agent.

[0018] In the above-mentioned resin system for self-generating pore expansion and sand consolidation, the weight ratio of the microporous silica microspheres, the KH-550 and the benzenesulfonyl hydrazide is (0.9-1): (1.9-2.1): (0.95-1.05).

[0019] On the other hand, the present invention provides a method for preparing the above-mentioned resin system for self-generating pore expansion and sand consolidation, comprising: first mixing the resin and the curing agent in proportion and stirring evenly, then adding the control agent, the reinforcing agent, the gas generating agent and water in proportion, mixing and stirring evenly, to obtain the resin system for self-generating pore expansion and sand consolidation.

[0020] The technical solution of the present invention has the following beneficial effects:

[0021] (1) The resin system for self-generating pore expansion and sand consolidation of the present invention has low viscosity and does not solidify under low temperature conditions. It can be injected in an "integrated" manner, which is convenient for construction. In addition, the gas generating agent generates a large amount of harmless gas (nitrogen) under formation conditions, retains the seepage channel, and has a high permeability retention rate of the consolidated body;

[0022] (2) The present invention uses a curing agent, 4,4-diaminodiphenylmethane, and a reinforcing agent, polyetheramine D230, to cure the resin, so that the strength of the solid body can reach 6.68Mpa;

[0023] (3) The present invention achieves low damage to the formation by reacting at a formation temperature of about 90°C and producing N2 that is harmless to the formation to perform pore expansion treatment, thereby retaining some seepage channels and achieving a permeability retention rate of more than 90%, thereby achieving low damage to the formation. DETAILED DESCRIPTION

[0024] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific embodiments. Except for the following contents, the process method of the present invention adopts conventional methods or devices in the art. Unless otherwise specified, the following terms have the meanings commonly understood by those skilled in the art.

[0025] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0026] Specifically, a resin system for self-generating pore expansion and sand consolidation includes: resin, curing agent, control agent, reinforcing agent, gas generating agent and water.

[0027] In some preferred embodiments, the resin is a guaiacol / maleic anhydride binary copolymer, the curing agent is 4,4-diaminodiphenylmethane, the controlling agent is citric acid, and the reinforcing agent is polyetheramine D230.

[0028] In the resin system for self-gasifying pore expansion and sand consolidation of the present invention, the guaiacol / maleic anhydride binary copolymer is less brittle, tough, not easy to crack, and does not shrink, deform, and has strength after curing. As a main body, it is a skeleton material with excellent mechanical properties and adhesive properties. 4,4-diaminodiphenylmethane has a curing effect in the system. The curing time of the system can be controlled by adjusting the amount of citric acid. The reinforcing agent polyetheramine D230 has a reinforcing effect on the clay to improve the compressive strength. The hydroxyl groups of the resin in the system interact with the hydroxyl groups on the sand particles, adsorb the curing agent and the resin, and a curing reaction occurs to form a thermosetting material with certain chemical activity and bonding strength, which bonds the sand particles to achieve the purpose of sand consolidation. After the adsorption is completed, it is cured under certain temperature conditions. The benzenesulfonylhydrazine part of the gas generator begins to oxidatively decompose at a formation temperature of about 90°C to produce a large amount of N2, occupying part of the seepage channel without being consolidated. The reaction also generates a large amount of heat to promote the partial curing of the resin. The synergistic effect of the various components makes the resin system for self-gassing pore expansion and sand consolidation have the advantages of low viscosity, no solidification under low temperature conditions, and high permeability retention rate of the consolidated body.

[0029] In some preferred embodiments, the resin system for self-generating pore expansion and sand consolidation of the present invention includes, based on 100 parts by total weight, 16-20 parts of resin, 10-14 parts of curing agent, 2-3 parts of controlling agent, 1-3 parts of reinforcing agent, 5-7 parts of gas generating agent, and the balance is water.

[0030] Through practice, it is found that if there is too much resin, the cost will increase, and if there is too little resin, the strength will decrease; if there is too much curing agent, the cost will increase, and if there is too little curing agent, the strength will decrease; if there is too little controlling agent, the curing time will be short, and if there is too much controlling agent, the curing time will be long and the strength will decrease; if there is too much reinforcing agent, the cost will increase, and if there is too little reinforcing agent, the strength will decrease; if there is too much gas generating agent, the strength will decrease, and if there is too little gas generating agent, the gas production will decrease and the permeability retention rate will decrease.

[0031] Further preferably, the resin system for self-generating pore expansion and sand consolidation of the present invention comprises, based on 100 parts by total weight, 18 parts of resin, 12 parts of curing agent, 2.5 parts of controlling agent, 2 parts of reinforcing agent, 6 parts of gas generating agent, and the balance is water.

[0032] In some preferred embodiments, the resin is prepared by the following method:

[0033] (1) dissolving guaiacol in dichloroethane, adding aluminum chloride and succinic anhydride in sequence under an ice-water bath, and heating to carry out a reaction;

[0034] (2) After the reaction is completed, hydrochloric acid is slowly added, and the first intermediate product is obtained by filtration, recrystallization, and drying;

[0035] (3) dissolving the first intermediate product in distilled water, adding hydrazine hydrate, raising the temperature, and reacting;

[0036] (4) After the reaction is completed, the reaction is cooled and the pH is adjusted to neutral, and the second intermediate product is obtained by filtering, washing, and drying;

[0037] (5) dissolving the second intermediate product and sodium m-nitrobenzene sulfonate in an alkaline solution, heating and reacting;

[0038] (6) After the reaction is completed, the pH is adjusted to neutral, and the resin is obtained by filtering, washing, and drying.

[0039] In some preferred embodiments, the gas generator is prepared by the following method: (1) adding microporous silica microspheres to a mixture of ethanol and water, adding KH-550 to the microporous silica microsphere suspension, and ultrasonically treating the mixture to obtain a mixture; (2) stirring, filtering, and drying the mixture to obtain microporous silica microspheres-KH-550; (3) adding benzenesulfonylhydrazine to an N,N-dimethylformamide solution, adding the microporous silica microspheres-KH-550, and stirring; (4) discarding the supernatant, collecting the precipitate, washing with methanol, and filtering to obtain a spherical solid particle gas generator.

[0040] The weight ratio of the microporous silica microspheres, the KH-550 and the benzenesulfonyl hydrazide is (0.9-1): (1.9-2.1): (0.95-1.05).

[0041] Wherein, microporous silica microspheres are prepared by the following method:

[0042] (1) dissolving nonylphenol ethoxylated decayl ether in water, and then adding citric acid to obtain a first mixed solution;

[0043] (2) dissolving n-octadecane in ethanol, slowly adding the first mixed solution under stirring, and stirring to obtain a second mixed solution;

[0044] (3) gradually adding silica into deionized water, heating and stirring;

[0045] (4) heating or allowing to stand, and after the reaction is completed, filtering, washing, and drying to obtain the product.

[0046] On the other hand, the present invention also provides a method for preparing a resin system for self-generating pore expansion and sand consolidation, comprising: first mixing the resin and the curing agent in proportion and stirring evenly, then adding the control agent, the reinforcing agent, the gas generating agent and water in proportion, mixing and stirring evenly, to obtain the resin system for self-generating pore expansion and sand consolidation.

[0047] Example

[0048] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods without specific conditions in the following examples are based on conventional methods and conditions.

[0049] The sources of raw materials used in the embodiments and comparative examples are as follows:

[0050] Polyetheramine D230: Industrial grade, Ousbang New Materials Co., Ltd.

[0051] Citric acid: AR grade, Aladdin Biochemical Technology Co., Ltd.

[0052] KH-550: AR grade, Guangzhou Yuanda New Materials Co., Ltd.

[0053] Benzenesulfonylhydrazide: AR grade, MacLean Biochemical Technology Co., Ltd.

[0054] 4,4-Diaminodiphenylmethane: AR grade, MacLean Biochemical Technology Co., Ltd.

[0055] The preparation method of guaiacol / maleic anhydride binary copolymer is as follows:

[0056] Add 30g of guaiacol and 380ml of dichloroethane to a three-necked flask equipped with a mechanical stirrer, and stir at room temperature to fully dissolve it. Then move the system to an ice-water bath, control the system temperature to 0°C, slowly add 83.3g of anhydrous aluminum chloride to the system, and continue stirring for 20min. Then take 25g of succinic anhydride and slowly add it to the system. After continuing to stir at 0°C for 30min, slowly raise the system temperature to 30°C, and react at this temperature for 8h. After the reaction is completed, pour the system into ice water, and add 20ml of concentrated hydrochloric acid dropwise to the system. Then collect the precipitate by suction filtration, and recrystallize the obtained crude product in distilled water. After drying, a white crystalline first intermediate product can be obtained. ② Add 22.5g of the first intermediate product obtained in the previous step and 150ml of distilled water to a three-necked flask equipped with a mechanical stirrer and a condensation reflux device. Heat to reflux, after the reactants are completely dissolved, add 15.6g of hydrazine hydrate with a purity of 80% to the system drop by drop, and continue to react under reflux for 2.5h. After the reaction is completed, pour the mixture into a beaker, cool to room temperature, and then adjust the pH of the system to 7 with concentrated hydrochloric acid. Filter by suction, collect the product on the filter cake, wash it three times with distilled water, and dry it to obtain a light yellow product, the second intermediate product. ③ In a three-necked flask equipped with a mechanical stirrer and a condensation reflux device, add 11g of the second intermediate product, 14g of sodium m-nitrobenzene sulfonate, and 550ml of a 0.5mol / L sodium hydroxide aqueous solution. Heat to reflux and react for 10h. After the reaction is completed, pour the system into a beaker, cool to room temperature, and add concentrated hydrochloric acid drop by drop until the pH value of the system is 7. Filter by suction, collect the product on the filter cake, wash it three times with distilled water, and dry it to obtain the final yellow product, guaiacol / maleic anhydride copolymer.

[0057] The preparation method of microporous silica microspheres is as follows:

[0058] First, 0.3g of nonylphenol ethoxylated decayl ether was dissolved in 60g of deionized water and stirred for 0.5h to completely dissolve NP-10 in water, and then 5mL of 1mol / L citric acid was added under stirring at room temperature. 1g of n-octadecane was dissolved in 25mL of ethanol and slowly added to the acidified nonylphenol ethoxylated decayl ether solution under stirring. The solution immediately turned into a milky emulsion. The emulsion was vigorously stirred at 50°C for 1 hour. Finally, 0.8g of silica was placed in 4g of deionized water, stirred vigorously at 50°C, and gradually added. Through this process, the pH value of the solution became 4-5. Then heat in an oven at 70°C for 4h or stand at room temperature for 24h, and then heat in an oven at 70°C for 12h. Filter the white precipitate, wash three times with deionized water, and dry overnight in a vacuum oven at 50°C. The product was finally obtained.

[0059] Gas generating agent: homemade in the laboratory

[0060] (1) Add 1 g of microporous silica microspheres to a mixture of ethanol and water (85 ml of ethanol and 15 ml of water), add 2 ml of KH-550 to the microporous silica microsphere suspension, and perform ultrasonic treatment to obtain a mixture; (2) Stir, filter, and dry the mixture to obtain microporous silica microspheres-KH-550; (3) Add benzenesulfonylhydrazine to 15 ml of N,N-dimethylformamide solution to obtain a 0.4 mol / L solution, then add the microporous silica microspheres-KH-550 and stir for 24 hours; (4) Discard the supernatant, collect the precipitate, wash it with methanol, and filter it to obtain a spherical solid particle gas generator.

[0061] Example 1

[0062] 16 parts of guaiacol / maleic anhydride binary copolymer and 10 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 6 parts of gas generating agent and the balance of water were added in proportion, and the total weight of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0063] The system was injected into a sand column and aged at 90°C to observe the permeability retention rate and compressive strength. The results are shown in Table 1.

[0064] Table 1

[0065]

[0066] Example 2

[0067] 18 parts of guaiacol / maleic anhydride binary copolymer and 12 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 6 parts of gas generating agent and the balance of water were added in proportion, and the total weight of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0068] The system was injected into a sand column and aged at 90°C to observe the permeability and compressive strength. The results are shown in Table 2.

[0069] Table 2

[0070]

[0071] Example 3

[0072] 18 parts of guaiacol / maleic anhydride binary copolymer and 14 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 6 parts of gas generating agent and the balance of water were added in proportion, and the total weight of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0073] The system was injected into a sand column and aged at 90°C to observe the permeability and compressive strength. The results are shown in Table 3.

[0074] Table 3

[0075]

[0076] Comparative Example 1

[0077] 18 parts of guaiacol / maleic anhydride binary copolymer and 12 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230 and the balance of water were added in proportion, and the sum of the weight parts of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-gasifying pore expansion and sand consolidation.

[0078] The system was injected into a sand column and aged at 90°C to observe the permeability and compressive strength. The results are shown in Table 4.

[0079] Table 4

[0080]

[0081] Comparative Example 2

[0082] 18 parts of guaiacol / maleic anhydride binary copolymer and 12 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 12 parts of gas generating agent and the balance of water were added in proportion, and the total weight of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0083] The system was injected into a sand column and aged at 90°C to observe the permeability and compressive strength. The results are shown in Table 5.

[0084] Table 5

[0085]

[0086] Comparative Example 3

[0087] 24 parts of guaiacol / maleic anhydride binary copolymer and 18 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 6 parts of gas generating agent and the balance of water were added in proportion, and the total weight of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0088] The system was injected into a sand column and aged at 90°C to observe the permeability and compressive strength. The results are shown in Table 6.

[0089] Table 6

[0090]

[0091]

[0092] Comparative Example 4

[0093] 18 parts of guaiacol / maleic anhydride binary copolymer and 12 parts of triethylenetetramine were mixed and stirred evenly according to the proportion, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 6 parts of gas generating agent and the balance of water were added in proportion, and the sum of the weight parts of the above components was 100. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0094] The system was injected into a sand column and aged at 90°C to observe the permeability and compressive strength. The results are shown in Table 7.

[0095] Table 7

[0096]

[0097] Comparative Example 5

[0098] 18 parts of guaiacol / maleic anhydride binary copolymer and 12 parts of 4,4-diaminodiphenylmethane were mixed and stirred evenly, and then 2.5 parts of citric acid, 2 parts of polyetheramine D230, 6 parts of gas generating agent and the balance of water were added in proportion, and the total weight of the above components was 100 parts. The two were mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

[0099] The system was injected into the sand column and aged at 50℃, 70℃ and 90℃ to observe the permeability and compressive strength. The results are shown in Table 8.

[0100] Table 8

[0101]

[0102]

[0103] By comparing Table 2 with Tables 4 and 5, it is found that when the gas generator is not used, the permeability retention rate of the sand column is greatly reduced. When too much gas generator is used, the permeability retention rate is not greatly affected, but too much gas causes the compressive strength to be greatly weakened. By comparing Table 2 with Table 7, it is found that when triethylenetetramine is used as the curing agent, the permeability retention rate and compressive strength are greatly weakened. By comparing Table 2 with Table 8, it is found that the system does not cure at a low temperature of 50°C, and the curing is incomplete at 70°C, and the compressive strength is weak. It can be seen from all the above tables that different systems are injected into the sand column, aged at 90°C, and the permeability and compressive strength are observed. Among them, the curing agent using 4,4-diaminodiphenylmethane has the best effect, and the optimal ratio is resin: curing agent: reinforcing agent: control agent: gas generator: clean water = 18:12:2.5:2:6:59.5. The permeability retention rate can reach 90% and the compressive strength can reach 6.68MPa. The higher the permeability retention rate, the less damage the sand consolidation effect has on the formation, and the higher the compressive strength, the higher the strength of the sand consolidation effect. In addition, it does not solidify under low temperature conditions, which is convenient for ground construction to directly inject into the formation for sand consolidation. In summary, the present invention successfully applies the self-generated gas expansion technology to the resin sand consolidation system, and realizes the protection of the reservoir permeability retention rate.

[0104] The present invention has been disclosed above with preferred embodiments, but those skilled in the art should understand that these embodiments are only used to describe the present invention and should not be understood as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to these embodiments should be deemed to be included in the scope of the claims of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined in the claims.

Claims

1. A resin system for self-generating pore expansion and sand consolidation, characterized in that: include: Resin, curing agent, control agent, reinforcing agent, gas generating agent and water.

2. The resin system for self-gasifying pore expansion and sand consolidation according to claim 1, characterized in that: Based on 100 parts by total weight, the composition includes: 16-20 parts by weight of resin, 10-14 parts by weight of curing agent, 2-3 parts by weight of controlling agent, 1-3 parts by weight of reinforcing agent, 5-7 parts by weight of gas generating agent, and the balance being water.

3. The resin system for self-gasifying pore expansion and sand consolidation according to claim 1, characterized in that: The total weight is 100 parts, including: 18 parts of resin, 12 parts of curing agent, 2.5 parts of control agent, 2 parts of reinforcing agent, 6 parts of gas generating agent, and the balance is water.

4. The resin system for self-gasifying pore expansion and sand consolidation according to any one of claims 1 to 3, characterized in that: The resin is a guaiacol / maleic anhydride binary copolymer.

5. The resin system for self-gasifying pore expansion and sand consolidation according to any one of claims 1 to 3, characterized in that: The curing agent is 4,4-diaminodiphenylmethane.

6. The resin system for self-gasifying pore expansion and sand consolidation according to any one of claims 1 to 3, characterized in that: The controlling agent is citric acid.

7. The resin system for self-gasifying pore expansion and sand consolidation according to any one of claims 1 to 3, characterized in that: The reinforcing agent is polyetheramine D230.

8. The resin system for self-gasifying pore expansion and sand consolidation according to any one of claims 1 to 3, characterized in that: The gas generating agent is prepared by the following method: (1) adding microporous silica microspheres to a mixture of ethanol and water, adding KH-550 to the suspension of microporous silica microspheres, and ultrasonically treating to obtain a mixture; (2) The mixture is stirred, filtered, and dried to obtain microporous silica microspheres-KH-550; (3) adding benzenesulfonyl hydrazide to N,N-dimethylformamide solution, adding the microporous silica microspheres-KH-550, and stirring; (4) The supernatant was discarded, the precipitate was collected, washed with methanol and then filtered to obtain a spherical solid particle gas generating agent.

9. The resin system for self-gasifying pore expansion and sand consolidation according to claim 8, characterized in that: The weight ratio of the microporous silica microspheres, the KH-550 and the benzenesulfonyl hydrazide is (0.9-1): (1.9-2.1): (0.95-1.05).

10. The method for preparing the resin system for self-generating pore expansion and sand consolidation according to any one of claims 1 to 9, characterized in that: include: First, the resin and curing agent are mixed and stirred evenly according to a proportion, and then the control agent, reinforcing agent, gas generating agent and water are added in proportion, and mixed and stirred evenly to obtain a resin system for self-generating pore expansion and sand consolidation.

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