Salt-resistant antibacterial high-interfacial activity gemini foam cleaning agent, preparation method and application thereof

Abstract

The application discloses a kind of salt-resistant antibacterial high interfacial activity gemini foam displacement agent and preparation method and application, long-chain alkyl tertiary amine or N-alkyl imidazole and 1,4-dibromo-2-butene are reacted in ethanol to obtain gemini intermediate, then gemini intermediate is reacted with anhydrous sodium sulfite in ionic liquid, and gemini surfactant is obtained.The preparation method of foam displacement agent of the application utilizes ionic liquid as dissolving to realize homogeneous sulfonation, greatly reduces the dosage of sodium sulfite, and the process is simple, easy to operate, short, and high in yield.Compared with traditional gemini foam displacement agent, the foam displacement agent of the application presents a typical cation / zwitterion hybrid structure, and has higher bactericidal and bacteriostatic properties, salt resistance, interfacial activity and foam performance;At the same time, the adsorption of traditional cationic gemini surfactant on the surface of rock is greatly reduced.It provides a new solution for high-salt oil reservoir oil displacement.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of surfactants, oil field chemistry and antibacterial, and particularly relates to a salt-tolerant antibacterial high-interfacial activity gemini foam displacement agent and a preparation method and application thereof. BACKGROUND

[0002] With the continuous exploitation of oil and gas fields, the increase of water content seriously affects the exploitation of natural gas. The foam drainage gas recovery process technology is the main means of drainage gas recovery at present due to low cost, simple operation and strong adaptability. The principle of foam drainage is to inject foam drainage agent into the bottom of the oil and gas well, and the foaming agent fully contacts with the well bottom liquid under the agitation of natural gas flow. When it encounters water, a large amount of low-density foam is generated, thereby reducing the friction loss of fluid in the pipe string, and then the well bottom liquid is carried to the ground by the gas flow from the well bottom, eliminating the plugging effect of gas and water channels, and thus achieving the purpose of good drainage gas recovery.

[0003] The foam displacement agent usually needs to have strong bubble capacity, large foam liquid carrying capacity and moderate foam stability. The foam displacement agent with suitable structure and performance up to standard is the key to the success of foam drainage. With the development of oil and gas, the geological conditions are deteriorating, and the difficulty of drainage gas recovery is increasing. The conventional foam displacement agent has been unable to adapt to the harsh environmental conditions of high salinity and high oil content.

[0004] In addition, a large amount of reinjection water is needed in the process of oil field drilling and secondary and tertiary oil recovery. The reinjection water mainly comes from the underground water and oil-water separation water in the oil production area, which contains a large amount of bacteria and their nutrients, especially sulfate-reducing bacteria (SRB) and saprophytic bacteria (TGB), causing great harm to oil and gas transmission pipelines and related equipment.

[0005] At present, the bactericide widely used in oil fields is a surfactant, especially a cationic and amphoteric quaternary ammonium salt compound. The cationic gemini foam displacement agent has excellent bactericidal efficiency due to the two long-chain hydrophobic groups in the molecule and the high charge density of the head group. However, due to long-term use, bacteria have developed drug resistance to it. SUMMARY

[0006] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0007] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0008] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a salt-resistant, antibacterial, and highly interfacially active Gemini-type foaming agent.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a salt-resistant, antibacterial, and highly interfacially active gemini-type foaming agent, wherein the molecular structure of the gemini-type foaming agent is shown in formula (1) or (2):

[0010]

[0011] Wherein, R1 is a saturated alkyl C n H 2n+1 ;

[0012] R2 is a saturated alkyl group C. n H 2n+1 , saturated alkylamidopropyl C n-1 H 2n-1 CONHCH2CH2CH2, unsaturated alkylamidopropyl C n-1 H 2n-3 Any one of CONHCH2CH2CH2, n = 10 to 20;

[0013] R3 is any one of methyl, ethyl, or propyl.

[0014] Another objective of this invention is to overcome the shortcomings of the prior art and provide a method for preparing a salt-resistant, antibacterial, and highly interfacially active Gemini-type foaming agent, comprising,

[0015] Preparation of the gemini intermediate: Dissolve 20-30 parts of long-chain alkyl tertiary amine or N-alkyl imidazole and 10-15 parts of 1,4-dibromo-2-butene in 30 parts of ethanol, add 1 part of alkali, and reflux at 70-100℃ for 3-12 h; remove the solvent and recrystallize 2-3 times with ethyl acetate to obtain intermediate M;

[0016] Preparation of Gemini bubble-dissolving agent: The Gemini intermediate M and anhydrous sodium sulfite are dissolved in an ionic liquid and stirred at 80-120°C for 5-10 hours;

[0017] Excess salt was removed by hot ethanol, and the product was recrystallized three times with acetone to obtain a white solid, which is the Gemini bubbling agent.

[0018] In a preferred embodiment of the preparation method described in this invention, the alkali is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate.

[0019] In a preferred embodiment of the preparation method described in this invention, the molar ratio of the gemini intermediate M to anhydrous sodium sulfite is 1:1 to 1.5.

[0020] In a preferred embodiment of the preparation method described in this invention, the molar ratio of the gemini intermediate M to anhydrous sodium sulfite is 1:1.2.

[0021] In a preferred embodiment of the preparation method described in this invention, the ionic liquid is one or more of 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-2,3-dimethylmethylimidazolium nitrate, and tetrabutylammonium tetrafluoroborate.

[0022] As a preferred embodiment of the preparation method described in this invention, the long-chain tertiary amine includes one of N,N-diethylhexadecyl tertiary amine, N,N-dimethylhexadecyl tertiary amine, N,N-dipropyloleoyl tertiary amine, N,N-dimethyldodecyl tertiary amine, N,N-dimethyldodecylamidopropyl tertiary amine, N,N-dihydroxyethyloctadecylamidopropyl tertiary amine, and N,N-dimethyloleoamidopropyl tertiary amine.

[0023] As a preferred embodiment of the preparation method described in this invention, the N-alkylimidazole includes one of N-hexadecylimidazole, N-oleoimidazole, and N-tetradecylimidazole.

[0024] Another objective of this invention is to overcome the shortcomings of the prior art and provide an application of a salt-resistant, antibacterial, and highly interfacially active Gemini foaming agent in oilfield drilling. This salt-resistant, antibacterial, and highly interfacially active Gemini foaming agent, in high-salt environments, has the functions of sterilization, reducing oil-water interfacial tension, and foam carrying liquid.

[0025] Beneficial effects of this invention:

[0026] (1) The salt-resistant, antibacterial, and highly interfacially active Gemini foaming agent provided by the present invention combines high interfacial activity, high bactericidal and bacteriostatic properties, high salt resistance, and high foaming properties. Compared with traditional Gemini foaming agents, the salt-resistant, antibacterial, and highly interfacially active Gemini foaming agent of the present invention exhibits a typical cationic / zwitterionic hybrid structure, and has higher bactericidal and bacteriostatic properties, salt resistance, interfacial activity, and foaming performance. At the same time, it greatly reduces the adsorption of traditional cationic Gemini surfactants on the rock surface.

[0027] (2) The salt-resistant, antibacterial, and highly interfacially active Gemini foaming agent of the present invention is prepared by using ionic liquids for dissolution to achieve homogeneous sulfonation, which greatly reduces the amount of sodium sulfite used. The process is simple, easy to operate, has a short process, and a high yield. Attached Figure Description

[0028] 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:

[0029] Figure 1 The hydrogen nuclear magnetic resonance spectrum of 14-SO3-14 prepared in Example 1 of this invention.

[0030] Figure 2 The hydrogen nuclear magnetic resonance spectrum of 16-SO3-16 prepared in Example 2 of this invention.

[0031] Figure 3 The hydrogen nuclear magnetic resonance spectrum of 14im-SO3-14im prepared in Example 3 of the present invention.

[0032] Figure 4 The Fourier transform infrared spectrum of 14im-SO3-14im prepared in Example 3 of this invention.

[0033] Figure 5 The hydrogen nuclear magnetic resonance spectrum of 16im-SO3-16im prepared in Example 4 of the present invention. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The chemical reaction equation for the preparation method of the salt-resistant, antibacterial, and highly interfacially active Gemini-type foaming agent of this invention is shown below:

[0038]

[0039] Wherein, R1 is a saturated alkyl C n H2n+1 ;

[0040] R2 is a saturated alkyl group C. n H 2n+1 , saturated alkylamidopropyl C n-1 H 2n-1 CONHCH2CH2CH2, unsaturated alkylamidopropyl C n-1 H 2n-3 Any one of CONHCH2CH2CH2, n = 10 to 20; R3 is any one of methyl, ethyl, or propyl.

[0041] Example 1

[0042] Preparation of 14-SO3-14:

[0043] Add 30 parts ethanol and 20 parts N,N-dimethyltetradecylamine to a flask, stir and gradually heat to 90°C; slowly add 10 parts 1,4-dibromo-2-butene, and react for 8 hours. After the reaction is complete, remove the solvent by rotary evaporation, and recrystallize three times with ethyl acetate to obtain a white solid 14-4-14.

[0044] 10 parts of the above-mentioned white solid, 20 parts of tetrabutylammonium tetrafluoroborate, and 12 parts of anhydrous sodium sulfite were added to a flask, and the mixture was heated to 100°C and reacted for 10 h. After the reaction was completed, excess salt was removed with hot ethanol, and the product was recrystallized three times with acetone to obtain a white solid. The solid was dried in a vacuum oven at 50°C for 12 h to obtain the pure product. The yield of 14-SO3-14 was 96%, and the yield was calculated as (target product biomass / reactant feed amount) × 100%. The molecular structure was confirmed by hydrogen nuclear magnetic resonance spectroscopy. Figure 1 ).

[0045] The molecular structure of 14-SO3-14 is shown in the following formula:

[0046]

[0047] Example 2

[0048] Preparation of 16-SO3-16:

[0049] Add 30 parts ethanol and 20 parts N,N-dimethylhexadecanine to a flask, stir and gradually heat to 100℃; slowly add 10 parts 1,4-dibromo-2-butene, and react for 12 h. After the reaction is complete, remove the solvent by rotary evaporation, and recrystallize three times with ethyl acetate to obtain a white solid 16-4-16.

[0050] In a flask, 10 parts of the above-mentioned white solid, 20 parts of 1-butyl-3-methylimidazolium tetrafluoroborate, and 15 parts of anhydrous sodium sulfite were added, and the mixture was heated to 120°C and reacted for 8 hours. After the reaction was completed, excess salt was removed with hot ethanol, and the product was recrystallized three times with acetone to obtain a white solid. The pure product was then dried in a vacuum oven at 50°C for 12 hours. The yield was 94% (16-SO3--16). Hydrogen nuclear magnetic resonance spectroscopy confirmed its molecular structure. Figure 2 The molecular structure of 16-SO3-16 is shown in the following formula:

[0051]

[0052] Example 3

[0053] Preparation of 14im-SO3-14im:

[0054] Add 32 parts ethanol and 21 parts N-tetradecylimidazole to a flask, stir and gradually heat to 80°C; slowly add 11 parts 1,4-dibromo-2-butene, and react for 10 h. After the reaction is complete, remove the solvent by rotary evaporation, and recrystallize three times with ethyl acetate to obtain a white solid 14im-4-14im.

[0055] Ten parts of the above-mentioned white solid, 20 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, and 10 parts of anhydrous sodium sulfite were added to a flask, and the mixture was heated to 120°C and reacted for 9 hours. After the reaction was completed, excess salt was removed with hot ethanol, and the product was recrystallized three times with acetone to obtain a white solid. The solid was dried in a vacuum oven at 50°C for 12 hours to obtain the pure product. The yield was 95% (14im-SO3--14im). The molecular structure was confirmed by proton nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. Figure 3 , 4 The molecular structure of 14im-SO3-14im is shown in the following formula:

[0056]

[0057] Example 4

[0058] Preparation of 16im-SO3-16im:

[0059] Add 40 parts ethanol and 20 parts N-tetradecylimidazole to a flask, stir and gradually heat to 100℃; slowly add 9 parts 1,4-dibromo-2-butene, and react for 10 h. After the reaction is complete, remove the solvent by rotary evaporation, and recrystallize three times with ethyl acetate to obtain a white solid 16im-4-16im.

[0060] In a flask, 10 parts of the above-mentioned white solid, 20 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, and 13 parts of anhydrous sodium sulfite were added, and the mixture was heated to 100°C and reacted for 10 h. After the reaction was completed, excess salt was removed with hot ethanol, and the product was recrystallized three times with acetone to obtain a white solid. The pure product was then dried in a vacuum oven at 50°C for 12 h. The yield was 96% (16im-SO3-16im). Hydrogen nuclear magnetic resonance spectroscopy confirmed its molecular structure. Figure 5 ).

[0061] The molecular structure of 16im-SO3-16im is shown in the following formula:

[0062]

[0063] Example 5

[0064] Preparation of 14im-SO3-14im using water as solvent:

[0065] Add 32 parts ethanol and 21 parts N-tetradecylimidazole to a flask, stir and gradually heat to 80°C; slowly add 11 parts 1,4-dibromo-2-butene, and react for 10 h. After the reaction is complete, remove the solvent by rotary evaporation, and recrystallize three times with ethyl acetate to obtain a white solid 14im-4-14im.

[0066] In a flask, 10 parts of the above-mentioned white solid, 40 parts of water, and 20 parts of anhydrous sodium sulfite were added, and the mixture was heated to 120°C and reacted for 12 hours. After the reaction was completed, excess salt was removed with hot ethanol, and the product was recrystallized three times with acetone to obtain a white solid. The solid was dried in a vacuum oven at 50°C for 12 hours to obtain the pure product. The yield was 65%.

[0067] Test case

[0068] 1. Sulfonation degree analysis

[0069] The sulfur atom content in the product was determined by inductively coupled plasma atomic emission spectrometry, and the degree of sulfonation of the Gemini foaming agents prepared in Examples 1-5 was analyzed. The results are shown in Table 1.

[0070] Table 1. Theoretical sulfur content, measured sulfur content, and degree of sulfonation of the Gemini-type foaming agents prepared in Examples 1-5.

[0071] Example 1 Example 2 Example 3 Example 4 Example 5 Theoretical content (%) 5.19 4.76 4.83 4.45 4.83 Measured content (%) 5.148 4.722 4.82 4.445 3.395 Degree of sulfonation (%) 99.2 99.2 99.8 99.9 70.3

[0072] Note: Degree of sulfonation = Measured content / Theoretical content × 100%

[0073] As shown in Table 1, using ionic liquids as solvents for sulfonation not only requires a small amount of anhydrous sodium sulfite, but also yields a sulfonation degree of over 99% in the recrystallized products. In contrast, using water as a solvent requires a larger amount of anhydrous sodium sulfite, results in a lower yield, and yields a sulfonation degree of only 70% in the recrystallized products.

[0074] 2. Solubility test

[0075] Three typical inorganic salts, NaCl, MgCl2, and CaCl2, were dissolved in 1 liter of deionized water at a mass ratio of 80:10:10 to prepare simulated saline solutions with different mineralizations. The solubility of the gemini-type foaming agents prepared in Examples 1-5 in water with different mineralizations was investigated at 25°C. Unsulfonated gemini intermediates 14-4-14 and 14im-4-14im were used as control groups. The results are shown in Table 2.

[0076] Table 2. Solubility of the Gemini-type foaming agents prepared in Examples 1-5 in water with different mineralization levels.

[0077]

[0078]

[0079] As can be seen from the table above, amphoteric geminal foaming agents containing sodium sulfate as spacers exhibit excellent salt tolerance, especially 14im-SO3--14im and 16im-SO3--16im, which remain completely soluble even at mineralization levels as high as 200,000 mg / L. In contrast, 14-4-14 and 14im-4-14im show poorer salt tolerance, dissolving only in 30,000 mg / L brine.

[0080] 3. Table / Interface Performance Testing

[0081] High surface / interfacial activity is an important indicator of a foaming agent, and also one of the important parameters for removing oil from the rock surface.

[0082] The equilibrium surface tension and critical micelle concentration of the gemini-type foaming agents prepared in Examples 1-5 at 25°C were determined using the pendant method (using deionized water as solvent, gemini-type foaming agent aqueous solutions with concentrations of 0.01, 0.025, 0.05, 0.075, 0.10, 0.20, 0.40, 0.60, 0.80, and 1.0 mmol / L were prepared). The oil-water interfacial tension between the gemini-type foaming agent aqueous solutions prepared in Examples 1-5 and liquid paraffin at 25°C was determined using the rotating droplet method. Unsulfonated gemini intermediates 14-4-14 and 14im-4-14im served as control groups. The results are shown in Table 3.

[0083] Table 3. Gemini-type foaming agents prepared in Examples 1-5 / Interface parameters

[0084]

[0085] Note: "×" indicates that the sample does not dissolve in the mineralized water and IFT cannot be measured.

[0086] As shown in Table 3, 14im-SO3--14im and 16im-SO3--16im can still form ultra-low interfacial tension with paraffin oil under 200,000 mg / L mineralized water conditions, meeting the oil displacement requirements. Furthermore, Examples 3-4 exhibit relatively low surface tensions of 33.13 mN / m and 32.86 mN / m, respectively, and relatively low critical micelle concentrations (cmc). Therefore, these amphoteric geminal foaming agents possess high surface activity and are more prone to self-assembly to form micelles.

[0087] 4. Sterilization performance test

[0088] The water injected during oil extraction contains a large number of bacteria. These bacteria can not only corrode equipment in the water system but also clog oil reservoirs, affecting normal oilfield operations and seriously endangering the oilfield water system. Therefore, the minimum inhibitory concentrations (MICs) of the gemini-type foaming agents prepared in Examples 1-5 against *Escherichia coli*, *Staphylococcus aureus*, sulfate-reducing bacteria (SRB), and saprophytic bacteria (TGB) were investigated. Unsulfonated gemini intermediates 14-4-14 and 14im-4-14im served as control groups. The results are shown in Table 4.

[0089] Table 4 shows the antibacterial activity of the twin-type decongestants prepared in Examples 1-5.

[0090] Example E. coli S. aureus SRB TGB 1 30 ppm 20 ppm 25 ppm 20 ppm 2 25 ppm 20 ppm 20 ppm 20 ppm 3 15 ppm 15 ppm 15 ppm 15 ppm 4 15 ppm 10 ppm 15 ppm 20 ppm 5 30 ppm 25 ppm 30 ppm 25 ppm 14-4-14 50 ppm 35 ppm 50 ppm 40 ppm 14im-4-14im 40 ppm 35 ppm 40 ppm 40 ppm

[0091] As shown in Table 4, Examples 1-4 all exhibited good antibacterial activity against the four bacteria, with minimum inhibitory concentrations (MICs) all below 30 ppm. In particular, the MICs of 14im-SO3--14im and 16im-SO3--16im were even below 20 ppm. In contrast, the MICs of the unsulfonated gemini intermediates 14-4-14 and 14im-4-14im were both above 30 ppm. This indicates that the gemini surfactant with a sulfate-containing spacer group of the present invention has a better bactericidal effect than conventional gemini surfactants.

[0092] 5. Anti-adsorption properties

[0093] Cationic surfactants typically undergo significant adsorption on rock surfaces, leading to a decrease in effective concentration and impacting application performance. The adsorption performance of the gemini-type foaming agents prepared in Examples 1-5 on quartz sand surfaces was evaluated by measuring the total organic carbon (TOC) content before and after adsorption. Unsulfonated gemini intermediates 14-4-14 and 14im-4-14im served as control groups. The results are shown in Table 5.

[0094] The specific method is as follows: Prepare a 0.3% (w / w) Gemini foaming agent aqueous solution with mineralized water, and mix it with quartz sand at a liquid-solid ratio of 10:1; then seal it and place it in an 85℃ constant temperature shaker for 24 hours to shake evenly; after filtration and centrifugation to remove quartz sand, take the supernatant and determine the total organic carbon content in the solution after adsorption.

[0095]

[0096] Table 5. Adsorption rates of the twin-type foaming agents prepared in Examples 1-5 on the rock surface.

[0097]

[0098] Note: "×" indicates that the sample is insoluble in water with this level of mineralization, and the adsorption rate cannot be determined.

[0099] As can be seen from the table above, Examples 3-4 exhibit relatively small adsorption losses on the rock surface, which is beneficial for reducing the amount of surfactant used during oil displacement and lowering industrial costs.

[0100] 6. Foam liquid carrying capacity

[0101] Referring to SY / T6465-2000 "Evaluation Method for Foaming Agents for Foam Drainage and Rice Gas", a liquid carrying capacity testing device was assembled to determine the foam liquid carrying capacity of the gemini-type foaming agents prepared in Examples 1-5. Unsulfonated gemini intermediates 14-4-14 and 14im-4-14im were used as control groups. The results are shown in Table 6.

[0102] Weigh 0.6 parts of the test sample and dissolve it in 200 mL of water. Then, place the solution in a constant temperature water bath at (60±0.5)℃ for aging, for a total of 30 minutes from the start of adding water to dissolve the sample. During the aging process, start the water pump to circulate water through the graduated tube jacket, stabilizing the water temperature at (60±0.5)℃. The inner wall of the graduated tube should be pre-soaked in chromic acid cleaning solution overnight to remove ions adsorbed on the inner wall, and then rinsed several times with distilled water. Before the test, rinse the inner wall of the tube with the test solution, taking care not to leave any foam on the inner wall. Turn on the air compressor pump and adjust the flow rate to a fixed value of 5 L / min using the flow meter. Add the surfactant solution to the foaming tube. Start timing when the foam reaches the receiver, and test the liquid carried by the foam within 15 minutes.

[0103] Wherein, liquid carrying capacity = volume of liquid carried by foam / initial volume of foaming agent × 100%.

[0104] Table 6. Foam liquid carrying capacity of the twin-type foaming agents prepared in Examples 1-5

[0105]

[0106] Note: "×" indicates that the sample does not dissolve in water with this level of mineralization, and the foam carrying capacity cannot be determined.

[0107] The amphoteric twin-type foaming agent provided by this invention can be used as the main foaming agent. When used as the main foaming agent in Examples 1-5, the liquid carrying rate can reach up to 97% in different mineralized waters, and the foam liquid carrying rate can still reach up to 95% in 200,000 mg / L mineralized water.

[0108] In addition, in the presence of 10% methanol, the foam liquid carrying capacity of Example 4 can reach 89%, which has a good effect as a foaming agent and has excellent salt resistance and methanol resistance.

[0109] 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 twin-type foaming agent, characterized in that: The molecular structure of the twin-type foaming agent is shown in formula (1): Wherein, R1 is a saturated alkyl C n H 2n+1 ; n＝10～20。 2. The preparation method of the Gemini-type foaming agent according to claim 1, characterized in that: include, Preparation of the gemini intermediate: Dissolve 20-30 parts of N-alkylimidazolium and 10-15 parts of 1,4-dibromo-2-butene in 30 parts of ethanol, add 1 part of alkali, and reflux at 70-100℃ for 3-12 h; remove the solvent and recrystallize with ethyl acetate 2-3 times to obtain intermediate M; Preparation of Gemini bubble-dissolving agent: The Gemini intermediate M and anhydrous sodium sulfite are dissolved in an ionic liquid and stirred at 80-120°C for 5-10 hours; Excess salt was removed by hot ethanol, and then recrystallized three times with acetone to obtain a white solid, which is the Gemini bubbling agent.

3. The preparation method according to claim 2, characterized in that: The alkali is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate.

4. The preparation method according to claim 2 or 3, characterized in that: The molar ratio of the twin intermediate M to anhydrous sodium sulfite is 1:1 to 1.

5.

5. The preparation method according to claim 4, characterized in that: The molar ratio of the twin intermediate M to anhydrous sodium sulfite is 1:1.

2.

6. The preparation method according to claim 2 or 3, characterized in that: The ionic liquid is one or more of 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-2,3-dimethylmethylimidazolium nitrate, and tetrabutylammonium tetrafluoroborate.

7. The preparation method according to claim 2 or 3, characterized in that: The N-alkylimidazole is one of N-hexadecylimidazole, N-oleoimidazole, and N-tetradecylimidazole.

8. The application of the twin-type foaming agent according to claim 1 in oilfield drilling.

9. The application according to claim 8, characterized in that: The twin-type foaming agent oil has the functions of sterilization, reducing oil-water interfacial tension, and foam liquid carrying in high-salt environments.

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