Salt-tolerant oil field gas production defoaming agent and preparation method thereof

Abstract

The invention relates to a salt-tolerant oilfield gas production defoaming agent and a preparation method thereof, in particular to the field of oilfield exploitation, and solves the problem of foam generated by factors such as gas dissolution and overflow. The invention discloses a super-hydrophobic silicone oil composition which comprises the following raw materials in parts by weight: 20-50 parts of hydrogen-containing silicone oil, 5-15 parts of a polyamide-polyether copolymer, 0.1-1 part of a catalyst, 2-5 parts of hydrophobic fumed silica, 5-15 parts of a cyclodextrin-derived supramolecular surfactant, 20-40 parts of a solvent and 5-10 parts of a solubilizer. Compared with the prior art, the defoaming agent has the following advantages that the reaction of Si-H and polyether amine is promoted by utilizing Lewis acid, a silicon amino bond (Si-N) is formed, the cross-linking property and chemical stability of polyether amine are enhanced, and after the supramolecular surfactant derived from cyclodextrin is added, the defoaming agent has excellent defoaming performance in a high-salt environment, so that the defoaming agent is suitable for being used in a high-salt environment. The foam can be effectively inhibited from being generated and quickly broken, the oil field gas recovery efficiency is remarkably improved, and equipment faults and energy consumption in the gas recovery process are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield gas recovery in high-salt environments, and particularly to a salt-tolerant oilfield gas production defoamer and a preparation method thereof. Background Art

[0002] During the process of oilfield gas production, foaming phenomena often stem from the coexistence of gas-liquid two-phase flow in pipelines. When gas and liquid flow mixed inside the pipeline, gas bubbles are prone to form, and this phenomenon is particularly significant under conditions of pressure fluctuations, flow rate changes, or when the liquid contains air bubbles. In addition, surfactants existing in the oilfield itself will further reduce the surface tension of the bubbles, which not only promotes the formation of bubbles but also enhances the stability of the foam structure.

[0003] The generation of foam poses significant challenges to the gas production efficiency of oilfields and the stable operation of equipment. On the one hand, it will reduce the gas flow rate, thereby reducing the overall gas production efficiency; on the other hand, it increases the operating load of key equipment such as pumping units and compressors, and may even cause equipment failures in severe cases.

[0004] In addition, foam may also cause pipeline blockages, interfering with the smooth progress of gas production operations. Especially in high-salt environments, due to the interference of salts, traditional defoamers often cannot effectively play their roles. Therefore, a new defoamer needs to be developed to meet the defoaming requirements in high-salt environments.

[0005] Upon retrieval, a preparation method of an organosilicon-modified polyether ester defoamer is disclosed in the patent with the patent application number CN202411574199.9. It mainly includes 30 - 40 parts of low hydrogen-containing silicone oil, 20 - 25 parts of allyl silicone oil, 12 - 15 parts of polyether-modified siloxane, 4 - 8 parts of lauric acid, 3 - 5 parts of p-toluenesulfonic acid catalyst, 8 - 12 parts of polyoxyethylene polyoxypropylene ether, 10 - 15 parts of heptamethyltrisiloxane, 1 - 2 parts of Tween80, and an appropriate amount of chloroplatinic acid catalyst.

[0006] It can be seen that from the application situation of this defoamer in the process of oilfield gas production in the current market, high-efficiency defoamers usually have relatively high costs, and the defoaming effect may decrease with the change of the viscosity of the fluid. Specifically, the organosilicon raw materials used in organosilicon-modified defoamers are relatively expensive in themselves, and in order to achieve good performance, some special modifiers and other auxiliary materials may need to be added, which will all lead to an increase in raw material costs.

[0007] Therefore, it is urgent to research and develop an efficient and salt-resistant defoamer. The active silicone paste of the defoamer described in this patent is prepared by promoting the reaction of Si-H with polyetheramine substances under the catalysis of Lewis acid to form a silicon amino bond (Si-N), enhancing the crosslinking and chemical stability of polyetheramine. And under the action of the supramolecular surfactant derived from cyclodextrin, it has high salt resistance. Therefore, the main application focus of the defoamer described in this patent is in the oilfield gas production field under the above high-salt environment. Summary of the Invention

[0008] To solve one of the above technical problems, the present invention provides a novel defoamer for oilfield gas production in a high-salt environment, aiming to solve the problems of unstable performance and poor defoaming effect of existing defoamers in a high-salt environment.

[0009] The present invention uses Lewis acid to promote the reaction of Si-H with polyetheramine to form a silicon amino bond (Si-N), enhancing the crosslinking and chemical stability of polyetheramine. And under the action of the supramolecular surfactant derived from cyclodextrin, it has high salt resistance. Therefore, the defoamer of the present invention can still defoam efficiently under high salt concentration, and has good stability and long-term effectiveness.

[0010] The technical solution adopted by the present invention is: a salt-resistant defoamer for oilfield gas production and its preparation method, including the following raw materials in parts by weight: 20-50 parts of hydrogen-containing silicone oil, 5-15 parts of polyamide-polyether copolymer, 0.1-1 part of catalyst, 2-5 parts of hydrophobic fumed silica, 5-15 parts of supramolecular surfactant derived from cyclodextrin, 20-40 parts of solvent, and 5-10 parts of solubilizer.

[0011] In any of the above solutions, preferably, the hydrogen content of the hydrogen-containing silicone oil is one or more of 0.18H, 0.36H, 0.45H, 0.72H, and 0.80H.

[0012] In any of the above solutions, preferably, the polyamide-polyether copolymer is one or more of polyamide-polyethylene glycol copolymer, polyamide-polypropylene ether copolymer, polyamide-polyether ester copolymer, and aromatic polyamide-polyether copolymer.

[0013] In any of the above solutions, preferably, the catalyst is a Lewis acid type, which is one or more of AlCl 3 、FeCl 3 、ZnCl 2 。

[0014] In any of the above solutions, preferably, the supramolecular surfactant derived from cyclodextrin is one or more of alkyl cyclodextrin, dialkyl cyclodextrin, ether cyclodextrin, and amino cyclodextrin.

[0015] Preferably, in any of the above solutions, the solvent is one or more of deionized water, ethanol, and methanol.

[0016] Preferably, in any of the above solutions, the solubilizer is one or more of polyvinyl alcohol, palmitic acid, sodium polyacrylate, and tetrahydrofuran.

[0017] The present invention also provides a method for preparing a salt-tolerant oilfield gas production defoamer, comprising the following steps: Step S1: Add 20 - 50 parts of hydrogen-containing silicone oil, 5 - 15 parts of polyamide-polyether copolymer, and 2 - 5 parts of hydrophobic fumed silica into a high-pressure reactor, add 0.1 - 1 part of catalyst, and simultaneously introduce N 2 Keep the pressure at 0.3 MPa to remove excess oxygen and maintain a closed environment, keep the temperature at 80 °C, stir for 3 - 4 h, and then close N 2 valve, raise the temperature to 155 °C, and continuously stir for 2 - 4 h; Step S2: After the reaction in Step 1 is completed, slowly release the pressure in the reactor. After cooling the obtained product to room temperature, an active silicone paste can be obtained; Step S3: Add 40 - 80 parts of active silicone paste and 5 - 15 parts of cyclodextrin-derived supramolecular surfactant into a stirring reactor to make its molecular chain more stable. Keep the temperature at 70 °C, stir for 30 min, then add 20 - 40 parts of solvent and 5 - 10 parts of solubilizer, and use high-shear homogenization technology for dispersion. After mixing evenly for 1 h, cool to room temperature to obtain the defoamer product.

[0018] Preferably, in any of the above solutions, the hydrogen content of the hydrogen-containing silicone oil in Step S1 is one or more of 0.18H, 0.36H, 0.45H, 0.72H, and 0.80H; The polyamide-polyether copolymer in Step S1 is one or more of polyamide-polyethylene glycol copolymer, polyamide-polypropylene ether copolymer, polyamide-polyether ester copolymer, and aromatic polyamide-polyether copolymer; The catalyst in Step S1 is a Lewis acid type, which is one or more of AlCl 3 , FeCl 3 , ZnCl 2 ; The cyclodextrin-derived supramolecular surfactant in Step S3 is one or more of alkyl cyclodextrin, dialkyl cyclodextrin, ether cyclodextrin, and amino cyclodextrin; The solvent in Step S3 is one or more of deionized water, ethanol, and methanol; The solubilizer in Step S3 is one or more of polyvinyl alcohol, palmitic acid, sodium polyacrylate, and tetrahydrofuran.

[0019] Preferably, in any of the above solutions, in step S1, the mass ratio of the hydrogen-containing silicone oil to the polyamide-polyether copolymer is (2:1)-(4:1).

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The defoamer of the present invention has strong defoaming ability in a high-salt environment and can effectively reduce foam accumulation. The defoamer of the present invention is non-toxic and harmless, meets environmental protection standards, can avoid polluting the oilfield environment, ensure the normal operation of oilfield gas production equipment, and guarantee production safety.

[0021] The present invention can effectively reduce the impact of foam on oilfield gas recovery, improve gas production efficiency, reduce equipment failure rate and energy consumption. The salt-tolerant oilfield gas production defoamer of the present invention can still maintain excellent defoaming performance in a high-salt environment, solving the problem of the failure of traditional defoamers in high-salt aqueous solutions, which is one of the core points of the present invention.

[0022] Lewis acid catalysts can promote the reaction between Si-H and polyetheramine substances, promote the conversion of Si-H into silicon amino bonds (Si-N), enhance the cross-linking and chemical stability of polyetheramine, and thus exhibit better defoaming ability. Further, under the action of cyclodextrin-derived supramolecular surfactants, the prepared defoamer has strong salt tolerance and dispersibility, and exhibits excellent anti-foam performance in a high-salt environment.

[0023] The salt-tolerant oilfield gas production defoamer of the present invention can reduce the accumulation of foam, avoid problems such as inconvenient operation, reduced efficiency, and equipment blockage caused by excessive foam, and improve the stability and smoothness of the overall process. Detailed implementation mode

[0024] The present invention will be further described below in conjunction with embodiments, but the implementation mode of the present invention is not limited thereto. For those not specified in the examples in terms of specific technologies or conditions, they shall be carried out according to the technologies or conditions described in the literature in this field or according to the product instructions. For reagents or instruments not specified in terms of the manufacturer, they are all conventional products that can be obtained through regular channels. Taking a high-salt concentration oilfield as an example, a comparative experiment was carried out using the defoamer of the present invention and a traditional defoamer. The experimental results show that in an environment with a salt concentration of 1-10%, the defoamer of the present invention can effectively break the foam.

[0025] Example 1: Add 30 parts of hydrogen-containing silicone oil, 10 parts of polyamide-polyethylene glycol copolymer, and 2.5 parts of hydrophobic fumed silica into a high-pressure reaction kettle, and add 0.2 parts of AlCl 3 , and at the same time introduce N 2 Keep the pressure at 0.3 MPa to remove excess oxygen and maintain a closed environment, keep the temperature at 80 °C, stir for 3 h, and then close N 2The valve is heated to 155°C and stirred continuously for 3 hours to obtain the active silica paste; Add 45 parts of the active silica paste and 10 parts of alkyl cyclodextrin to the reaction kettle. Keep the temperature at 70°C. After stirring for 30 minutes, add 20 parts of deionized water and 5 parts of polyvinyl alcohol, and disperse them using high-shear homogenization technology. Mix evenly for 1 hour, and then cool to room temperature to obtain the defoamer product.

[0026] Example 2: Add 35 parts of hydrogen-containing silicone oil, 20 parts of polyamide-polypropylene ether copolymer, and 2 parts of hydrophobic fumed silica to the high-pressure reaction kettle, and add 0.15 parts of ZnCl 2 , and at the same time introduce N 2 Keep the pressure at 0.3 MPa to remove excess oxygen and maintain a closed environment. Keep the temperature at 80°C. After stirring for 3 hours, close the N 2 The valve is heated to 155°C and stirred continuously for 4 hours to obtain the active silica paste; Add 42.5 parts of the active silica paste and 12.5 parts of dialkyl cyclodextrin to the reaction kettle. Keep the temperature at 70°C. After stirring for 30 minutes, add 25 parts of deionized water and 5.5 parts of palmitic acid, and disperse them using high-shear homogenization technology. Mix evenly for 1 hour, and then cool to room temperature to obtain the defoamer product.

[0027] Example 3: Add 47.5 parts of hydrogen-containing silicone oil, 15 parts of polyamide-polyether ester copolymer, and 5 parts of hydrophobic fumed silica to the high-pressure reaction kettle, and add 0.2 parts of FeCl 3 , and at the same time introduce N 2 Keep the pressure at 0.3 MPa to remove excess oxygen and maintain a closed environment. Keep the temperature at 80°C. After stirring for 4 hours, close the N 2 The valve is heated to 155°C and stirred continuously for 2 hours to obtain the active silica paste; Add 40 parts of the active silica paste and 15 parts of amino cyclodextrin to the reaction kettle. Keep the temperature at 70°C. After stirring for 30 minutes, add 30 parts of deionized water and 7.5 parts of sodium polyacrylate, and disperse them using high-shear homogenization technology. Mix evenly for 1 hour, and then cool to room temperature to obtain the defoamer product.

[0028] Example 4: Add 32.5 parts of hydrogen-containing silicone oil, 5 parts of polyamide-polyethylene glycol copolymer, and 3.5 parts of hydrophobic fumed silica to the high-pressure reaction kettle, and add 0.3 parts of AlCl 3 , and at the same time introduce N 2 Keep the pressure at 0.3 MPa to remove excess oxygen and maintain a closed environment. Keep the temperature at 80°C. After stirring for 3 hours, close the N 2 The valve is heated to 155°C and stirred continuously for 4 hours to obtain the active silica paste; Add 42.5 parts of active silica paste and 12.5 parts of alkyl cyclodextrin into a reaction kettle. Keep the temperature at 70 °C and stir for 30 min. Then add 20 parts of deionized water and 10 parts of tetrahydrofuran, and disperse them using high-shear homogenization technology. Mix evenly for 1 h, and cool to room temperature to obtain the defoamer product.

[0029] Comparative Example 1: A commercially available oilfield gas production defoamer, whose main components are silicone, polyether, emulsifier, etc.

[0030] 1. Measure the defoaming and foam inhibition performance of the product prepared above under high-salt environment.

[0031] (1) The defoaming performance test method (circulating bubbling method) is as follows: Add the foaming liquid to the 500 mL circulating bubbling apparatus to the 100 mL scale. Start the instrument until the foam height rises to 400 mL, then add a certain amount of defoamer, and start the stopwatch at the same time to record the time taken for the foam to disappear.

[0032] (2) The foam inhibition performance test method (circulating bubbling method) is as follows: Start the circulating bubbling apparatus in (1) again, and observe the time required for the foam height to reach 400 mL again, which is the foam inhibition time of the defoamer.

[0033] 2. Defoaming and foam inhibition performance test: (1) Foaming liquid: Add 5% NaCl salt solution to 5% tubing slurry, and add 5% sodium dodecylbenzenesulfonate to the above mixture as the foaming liquid.

[0034] (2) Test method: Use the circulating bubbling method to test and observe the defoaming and foam inhibition effects.

[0035] The experimental results are shown in Table 1.

[0036] Table 1 Sample Defoaming time Anti-foaming time Example 1 2 min 4.5h Example 2 2.5 min 4h Comparative Example 1 5 min 2h 3. Defoaming and foam inhibition performance test: (1) Foaming liquid: Add 10% NaCl salt solution to 5% tubing slurry, and add 5% sodium dodecylbenzenesulfonate to the above mixture as the foaming liquid.

[0037] (2) Test method: Use the circulating bubbling method to test and observe the defoaming and foam inhibition effects.

[0038] (3) The experimental results are shown in Table 2.

[0039] Table 2 Sample Defoaming time Anti-foaming time Example 1 2.5 min 4h Example 2 3 min 3.5h Comparative Example 1 6.5 min 1.5h 4. Defoamer salt resistance test: (1) Take 5% tubing slurry as Liquid A, add 5% NaCl to 5% tubing slurry to get Liquid B, and add 10% NaCl to 5% tubing slurry to get Liquid C. Add 5% sodium dodecylbenzenesulfonate to the three slurries to form foam, and then add the defoamer prepared in Comparative Example 1. The influence of the defoamer on the density recovery rate is shown in Table 3.

[0040] (2) Test method: Use the circulating bubbling method for testing and observe the defoaming effect.

[0041] (3) The experimental results are shown in Table 3.

[0042] Table 3 As can be seen from Table 1 and Table 2, the defoamer of this patent application has good defoaming and foam inhibition effects in oilfield gas production, and is superior to the commercially available defoamer in Comparative Example 1. It can be seen from Table 3 that the defoamer has good defoaming effects in tubing slurry, 5% brine slurry and 10% brine slurry, and the density recovery rate is above 97%, indicating that the defoamer of this invention has good salt resistance and defoaming ability.

[0043] The comprehensive advantages of this invention also include: in the actual application scenario, the defoamer of this invention shows far better adaptability than traditional products. The oilfield gas production operation environment is complex and changeable. In addition to the challenge of high salinity, fluctuations in temperature and pressure are also very common.

[0044] The defoamer of this invention can still stably exert its defoaming and foam inhibition performance under different temperature and pressure conditions.

[0045] For example, in a high-temperature environment, the chemical bonds between hydrogen-containing silicone oil and polyamide polyether copolymer and their interactions with other components remain stable, and the defoaming performance will not decrease due to the increase in temperature; in a high-pressure environment, its molecular structure will not be damaged, and it can continuously and effectively inhibit the generation and growth of foam.

[0046] Due to its high defoaming performance, it can greatly reduce the equipment failure maintenance cost, downtime loss and additional gas production energy consumption caused by foam problems.

[0047] Traditional defoamers need to be added frequently to maintain a certain defoaming effect, while the defoamer of this invention has a relatively small addition amount and a long-lasting effect. Overall, it can save a large amount of operating costs for oilfield exploitation enterprises.

[0048] During the oilfield gas production process, it is inevitable that part of the defoamer will enter the surrounding environment along with the produced fluid.

[0049] The defoamer of this invention can be quickly decomposed by microorganisms in soil and water bodies, and will not accumulate residues for a long time. It has almost no negative impact on the surrounding ecological environment, such as the soil ecosystem and aquatic organisms, effectively protecting the ecological balance around the oilfield.

[0050] During the production process, strict raw material screening and precise reaction condition control ensure the consistency of the quality of each batch of defoamers.

[0051] By precisely controlling key parameters such as the hydrogen content of hydrogen-containing silicone oil, the type and proportion of polyamide-polyether copolymer, and strictly monitoring the reaction temperature, time, and pressure, the defoamers produced in different batches maintain high consistency in terms of defoaming performance, salt resistance, and stability, providing reliable quality assurance for oilfield gas production operations.

[0052] In summary, high-efficiency defoaming and foam suppression: The defoamer of the present invention has strong defoaming and foam suppression capabilities in a high-salt environment. By promoting the reaction of Si-H with polyetheramine through a Lewis acid to form a silicon amino bond (Si-N), enhancing the cross-linking and chemical stability of polyetheramine, and combining with a supramolecular surfactant derived from cyclodextrin, it can quickly inhibit foam generation and rapidly break foam. Experimental data shows that in the foaming liquid of 5% NaCl salt solution, the defoaming time of the defoamer in Example 1 is only 2 min, and the foam suppression time reaches 4.5 h, which is superior to the commercially available defoamers mainly composed of silicone, polyether, and emulsifier (defoaming time 5 min, foam suppression time 2 h), effectively solving the problem of foam accumulation in oilfield gas production.

[0053] Improving gas production efficiency: It effectively reduces the obstruction of foam to gas flow, reduces the energy consumption during gas production, and thus significantly improves the gas recovery efficiency of oilfields. The presence of foam will reduce gas flow and affect gas production efficiency, while this defoamer can quickly eliminate foam, ensuring smooth gas flow and bringing higher economic benefits to oilfield exploitation.

[0054] Reducing the risk of equipment failure: It reduces the adverse effects of foam on key gas production equipment such as pumping units and compressors, reduces the equipment operation load, and avoids equipment failures caused by excessive foam. For example, in actual gas production operations, a stable defoaming effect can enable the equipment to operate stably for a long time, extend the service life of the equipment, reduce maintenance costs and downtime, and ensure the continuity of gas production operations.

[0055] Good salt resistance: It can still maintain excellent defoaming performance in a high-salt environment, solving the problem of the failure of traditional defoamers in high-salt aqueous solutions. From the experimental data, in the foaming liquid of adding 10% NaCl salt solution to 5% tubing slurry, the density recovery rate of the defoamer of the present invention is above 97%, indicating that it can still effectively defoam at high salinity and has strong adaptability.

[0056] Environmental protection and safety: The defoamer of the present invention is non-toxic and harmless, meets the environmental protection standards, avoids pollution to the oilfield environment, and ensures the safety of production. During the oilfield exploitation process, it will not cause harm to the surrounding soil, water bodies and other environments, safeguards the ecological balance, and also creates a safer working environment for the staff.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; for those skilled in the art of this technology, any alternative improvement or transformation made to the embodiments of the present invention falls within the protection scope of the present invention.

[0058] Where the present invention is not described in detail, it is the well-known technology of those skilled in the art of this technology.

Claims

1. A salt-tolerant oilfield gas production defoamer and a preparation method thereof, characterized in that: The invention comprises the following raw materials in parts by weight: 20-50 parts of hydrogen-containing silicone oil, 5-15 parts of polyamide-polyether copolymer, 0.1-1 parts of catalyst, 2-5 parts of hydrophobic gas-phase silica, 5-15 parts of supramolecular surfactant derived from cyclodextrin, 20-40 parts of solvent and 5-10 parts of solubilizer.

2. A salt-tolerant oilfield gas production defoamer and a preparation method thereof according to claim 1, characterized in that: The hydrogen content of the hydrogen-containing silicone oil is one or more of 0.18H, 0.36H, 0.45H, 0.72H, and 0.80H.

3. A salt-tolerant oilfield gas production defoamer and a preparation method thereof according to claim 2, characterized in that: The polyamide-polyether copolymer is one or more of a polyamide-polyethylene glycol copolymer, a polyamide-polypropylene ether copolymer, a polyamide-polyether ester copolymer, and an aromatic polyamide-polyether copolymer.

4. A salt-tolerant oilfield gas production defoamer and a preparation method thereof according to claim 3, characterized in that: The catalyst is a Lewis acid, which is one or more of AlCl3, FeCl3, and ZnCl2.

5. A salt-tolerant oilfield gas production defoamer and a preparation method thereof according to claim 4, characterized in that: The cyclodextrin-derived supramolecular surfactant is one or more of alkyl cyclodextrin, dialkyl cyclodextrin, ether cyclodextrin and amino cyclodextrin.

6. A salt-tolerant oilfield gas production defoamer and a preparation method thereof according to claim 5, characterized in that: The solvent is one or more of deionized water, ethanol and methanol.

7. A salt-tolerant oilfield gas production defoamer and a preparation method thereof according to claim 6, characterized in that: The solubilizer is one or more of polyvinyl alcohol, palmitic acid, sodium polyacrylate, and tetrahydrofuran.

8. A method for preparing a salt-tolerant oilfield gas production defoamer, characterized in that: The steps include: Step S1: Add 20-50 parts of hydrogenated silicone oil, 5-15 parts of polyamide-polyether copolymer, 2-5 parts of hydrophobic fumed silica into a high-pressure reactor, add 0.1-1 parts of a catalyst, and introduce N2 to maintain a pressure of 0.3 MPa to remove excess oxygen and maintain a closed environment. The temperature is maintained at 80°C, and after stirring for 3-4 hours, the N2 valve is closed, the temperature is raised to 155°C, and stirring is continued for 2-4 hours; Step S2: After the reaction in step 1 is completed, the air pressure in the reactor is slowly released, and the obtained product is cooled to room temperature to obtain an active silicone paste; Step S3: Add 40-80 parts of active silicone paste and 5-15 parts of cyclodextrin-derived supramolecular surfactant into a stirred reactor to make its molecular chain more stable. Keep the temperature at 70°C. After stirring for 30 minutes, add 20-40 parts of solvent and 5-10 parts of solubilizer. Use high shear homogenization technology to disperse. After mixing evenly for 1 hour, cool to room temperature to obtain the defoamer product.

9. The preparation method according to claim 8, characterized in that: The hydrogen content of the hydrogen-containing silicone oil in step S1 is one or more of 0.18H, 0.36H, 0.45H, 0.72H, and 0.80H; The polyamide-polyether copolymer in step S1 is one or more of a polyamide-polyethylene glycol copolymer, a polyamide-polypropylene ether copolymer, a polyamide-polyether ester copolymer, and an aromatic polyamide-polyether copolymer; The catalyst in step S1 is a Lewis acid, which is one or more of AlCl3, FeCl3, and ZnCl2; The cyclodextrin-derived supramolecular surfactant in step S3 is one or more of alkyl cyclodextrin, dialkyl cyclodextrin, ether cyclodextrin, and amino cyclodextrin; The solvent in step S3 is one or more of deionized water, ethanol, and methanol; In step S3, the solubilizing agent is one or more of polyvinyl alcohol, palmitic acid, sodium polyacrylate, and tetrahydrofuran.

10. The preparation method according to claim 9, characterized in that: The hydrogen-containing silicone oil and the polyamide-polyether copolymer in step S1 have a mass ratio of 2:1-4:1.