Sterilization corrosion and scale inhibition foaming agent for foam drainage and preparation method thereof

Abstract

The invention relates to a sterilizing, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage and a preparation method thereof, and belongs to the technical field of oil and gas development. The sterilizing, corrosion-inhibiting and scale-inhibiting foaming agent comprises the following components in percentage by mass: 1%-2% of a triazole bactericide, 3%-5% of a scale inhibitor, 0.2%-1% of polyvinyl alcohol, 10%-18% of a bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5%-10% of benzene sulfonate, 5%-10% of Ninol and the balance of water. The foaming agent is good in foaming performance, the prepared foam liquid is stable in foam, very high in liquid carrying capacity and good in salt resistance, temperature resistance and oil resistance, compared with a foaming agent in the prior art, the foaming agent is better in performance, and the foaming agent is suitable for different oil and gas wells, shale gas wells and other environments. And besides foaming performance, the detergent also has excellent sterilization, corrosion inhibition and scale inhibition effects, realizes multiple effects by one agent, and is very strong in comprehensive performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas development, and particularly relates to a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage and a preparation method thereof. Background Art

[0002] During the production process of oil and gas wells and shale gas wells, since the liquid in the wellbore cannot be continuously carried out of the wellhead, the liquid accumulates at the bottom of the well to form bottom-hole liquid accumulation. The bottom-hole liquid accumulation will increase the bottom-hole back pressure, limit the production capacity of the well, cause the production of oil and gas wells and shale gas wells to decrease, and even cause production stoppage.

[0003] Foam drainage is a commonly used measure to remove bottom-hole liquid accumulation, which has the advantages of low cost and simple process. Its principle is: injecting a foaming agent from the wellhead of a production well with insufficient liquid-carrying capacity into the bottom of the well, and with the stirring action of the natural gas flow, making it fully contact with the bottom-hole liquid accumulation, thereby reducing the liquid surface tension, generating a large amount of relatively stable water-containing foam, reducing the gas slippage amount, greatly reducing the density of the gas-liquid mixture, and significantly reducing the frictional resistance loss in the tubing of the flowing well and the gravity gradient in the well. The foam carries the bottom-hole liquid accumulation to the ground, thereby achieving the purpose of drainage gas production.

[0004] With the deep development of oil and gas wells and shale gas wells, the composition of the bottom-hole liquid accumulation becomes more complex and the treatment difficulty becomes higher. For example, some bottom-hole liquid accumulations contain a large amount of inorganic salts, bacteria, hydrogen sulfide or carbon dioxide, etc., among which there are condensate oil, organic precipitates, etc. and the mineralization degree is high. The existing conventional foaming agents cannot effectively foam and cannot achieve a sufficient foam drainage effect. And during the process of removing the bottom-hole liquid accumulation, affected by the high temperature of the environment, the conventional foaming agents are not compatible with corrosion inhibitors, bactericides, etc., resulting in poor foaming performance of the bottom-hole liquid accumulation, and then difficult to remove, which is not conducive to production. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage and a preparation method thereof, which simultaneously have multiple functions such as sterilization, corrosion inhibition, scale inhibition, and foaming, are applicable to complex bottom-hole environments such as high temperature and high condensate oil content, have good foaming effects, are convenient for subsequent liquid drainage, and thus realize the effective production of oil and gas wells and shale gas wells.

[0006] The embodiments of the present application are implemented as follows: The embodiments of the present application provide a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage, comprising the following components in mass percentage: 1%-2% of triazole bactericides, and the triazole bactericides are one or more of diniconazole, myclobutanil, triadimenol, and bitertanol.

[0007] 3% - 5% scale inhibitor, the scale inhibitor being one or more of polyaspartic acid and polystyrene sulfonic acid; further, the polyaspartic acid is preferably with an average relative molecular mass of 2×10 4 - 5×10 4 g / mol, and the polystyrene sulfonic acid is preferably with an average relative molecular mass of 3×10 4 - 4×10 4 g / mol, with better solubility and lower requirements for the preparation process.

[0008] 0.2% - 1% polyvinyl alcohol, the polyvinyl alcohol being polyvinyl alcohol 1788 and / or polyvinyl alcohol 1792, which has better solubility and a simpler preparation process.

[0009] 10% - 18% of a bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant being self - made by the applicant, and its structural formula is as shown in formula (1): Formula (1); In formula (1), R represents a fatty acid with C11 - C17, and n is 2 - 8; The bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant provided by the applicant has the dual functions of foaming and corrosion inhibition, and has good compatibility with other components. It can synergistically enhance the effect with triazole fungicides, making the prepared foaming agent exhibit excellent foaming performance and foam stability, and having good salt tolerance, high temperature resistance, and excellent bactericidal effect.

[0010] 5% - 10% of benzenesulfonate, the benzenesulfonate being at least one of heavy alkylbenzene sulfonate and sodium dodecylbenzenesulfonate. The benzenesulfonate used in this application has good salt tolerance itself, and synergizes with the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant to exert an excellent foaming effect, with strong foam stability and high liquid - carrying capacity.

[0011] 5% - 10% of Ninol, and the balance is water.

[0012] The foam - drainage bactericidal, corrosion - inhibiting, scale - inhibiting and foaming agent provided by this application, with the applicant's original formula, components and dosages, has good compatibility and synergizes with each other, achieving excellent foaming, bactericidal, corrosion - inhibiting, scale - inhibiting and other effects. It is also high - temperature resistant and high - salt resistant, with a wide range of applications, suitable for various oil and gas wells, shale gas wells, etc., and has a broad market prospect.

[0013] The principle is that when the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant and triazole fungicides are used simultaneously, they can quickly bind to and damage the cell walls, cell membranes, etc. of fungi, bacteria, etc., and effectively block the synthesis of ergosterol, which not only effectively kills bacteria but also hinders their reproduction, significantly improving the bactericidal effect of the foaming agent.

[0014] As scale inhibitors, polyaspartic acid and polystyrenesulfonic acid not only exhibit good scale inhibition effects, but also, based on their molecular configurations, are interconnected with polyvinyl alcohol and surfactants, increasing the viscosity of the foam liquid film, thereby reducing the drainage rate of the foam liquid film and enhancing the stability of the foam. Moreover, the presence of polyvinyl alcohol increases the elasticity and strength of the foam liquid film, further reducing the drainage rate of the liquid film and significantly improving the stability of the foam.

[0015] The applicant's original bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant has a gemini surfactant structure, with high surface activity and strong foaming ability. It can adsorb and form a film on the surface of the pipe string, thereby isolating and hindering the contact between corrosive media (such as bottom-hole liquid accumulation, sour natural gas, etc.) and the pipe string matrix, and can simultaneously perform the dual functions of foaming and corrosion inhibition. Moreover, due to the presence of zwitterions, it has good compatibility with other surfactants and components, strong salt tolerance, and a wider application range.

[0016] Furthermore, the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant synergizes with benzenesulfonate and Ninol, further enhancing the foaming ability and foam stability of the foaming agent under various working conditions. Among them, benzenesulfonate provides strong electrostatic repulsion, can reduce the surface tension, and quickly adsorbs on the gas-liquid interface to form an initial foam layer; Ninol enhances the intermolecular adhesion force through hydrogen bonding and hydrophobic interactions, fills the molecular gaps of other surfactants, reduces the fluidity of the interfacial film, and reduces bubble coalescence. Moreover, its long-chain structure can also increase the viscosity of the liquid film; due to the unique dual hydrophilic head groups and dual hydrophobic chain structure of the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, a more compact interfacial arrangement can be formed, reducing the charge repulsion of the benzenesulfonate surfactant through the electrostatic neutralization effect of zwitterions, and simultaneously forming mixed micelles with Ninol, significantly enhancing the mechanical strength of the interfacial film.

[0017] This application also provides a preparation method for the bactericidal, corrosion-inhibiting, scale-inhibiting and foaming agent for foam drainage, which includes the following steps: S1. By mass percentage, add a measured amount of water to the reaction kettle, heat it to 60 - 80 °C and stir, and the stirring speed is preferably 300 - 600 rpm.

[0018] S2. Slowly add 0.2% - 1% of polyvinyl alcohol into the reactor. Set the adding speed according to the adding amount and the equipment condition, so that it takes 30 - 60 minutes to be completely added into the reactor, and then continue stirring for 30 - 60 minutes. Adding the raw materials uniformly at a fixed rotation speed and stirring can make the raw materials fully mixed and evenly distributed, better play their roles, and the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage obtained has more uniform and stable performance. The polyvinyl alcohol is preferably polyvinyl alcohol 1788 and / or polyvinyl alcohol 1792. Slowly adding polyvinyl alcohol can avoid the problem of polyvinyl alcohol coagulating into lumps caused by rapid addition; as a kind of polymer, polyvinyl alcohol is easy to aggregate and difficult to disperse after forming lumps; the preferred adding speed in this application enables polyvinyl alcohol to dissolve uniformly and stably in the reaction solution.

[0019] S3. Cool down the reaction system to 30 - 50 °C, add 3% - 5% of scale inhibitor into the reactor. Similarly, set the adding speed according to the adding amount and the equipment condition, so that it takes 30 - 60 minutes to be completely added into the reactor, and then continue stirring for 30 - 60 minutes. Slowly adding the scale inhibitor also realizes the problem of avoiding the scale inhibitor coagulating into lumps. The scale inhibitor is one or more of polyaspartic acid and polystyrene sulfonic acid; further, the polyaspartic acid is preferably with an average relative molecular mass of 2×10 4 -5×10 4 g / mol, and the polystyrene sulfonic acid is preferably with an average relative molecular mass of 3×10 4 -4×10 4 g / mol. The preferred average relative molecular mass has better solubility and lower requirements for the preparation process.

[0020] Cooling down to 30 - 50 °C in step S3 can reduce energy consumption while ensuring the dissolution efficiency of the scale inhibitor, saving energy expenditure. Without considering energy consumption, the temperature can also not be reduced; not reducing the temperature does not affect the dissolution and function of the scale inhibitor and subsequent components. Of course, if necessary, it can also be directly cooled down to room temperature. The dissolution speed of the scale inhibitor and subsequent components becomes slower, and it needs to be stirred for a longer time to make it fully dissolve and evenly disperse; after full dissolution, the efficacy of the foaming agent provided by this method is no different from that of the original method.

[0021] S4. Add 5% - 10% of benzene sulfonate into the reactor and continue stirring for 30 - 60 minutes. The benzene sulfonate is at least one of heavy alkyl benzene sulfonate and sodium dodecyl benzene sulfonate.

[0022] S5. Reduce the rotational speed to 100 - 300 rpm, and sequentially add 1% - 2% triazole fungicide, 10% - 18% bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 5% - 10% Ninol into the reaction kettle, and continue stirring for 30 - 60 minutes. Then stop stirring and cool down to room temperature to obtain a bactericidal corrosion inhibitor and scale inhibitor for foam drainage. The triazole fungicide is one or more of diniconazole, myclobutanil, triadimenol, and bitertanol.

[0023] This method has a simple process, has low requirements for the environment and equipment, is suitable for industrial application, and has high market value.

[0024] Furthermore, the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant is prepared by the following method: S1. By mass, put 80 - 120 parts of fatty acid and 10 - 20 parts of water - carrying agent into a reaction kettle, and the reaction kettle is preferably a reaction kettle with a condensation reflux function; introduce an inert gas into the reaction system and stir to make the raw materials fully and evenly mixed. In this application, the inert gas is preferably nitrogen. The stirring rotational speed is preferably 100 - 300 rpm, and the stirring time is preferably 10 - 30 minutes. The fatty acid is a saturated fatty acid or an unsaturated fatty acid, preferably one or more of oleic acid, lauric acid, and stearic acid. The water - carrying agent is preferably toluene and / or xylene.

[0025] It should be noted that nitrogen is introduced into the reaction system and stirred at a fixed rotational speed throughout the reaction process, starting from when the raw materials are initially added to the reaction kettle until the reaction ends to obtain the product.

[0026] The continuously introduced nitrogen can expel the air or other gases in the reaction kettle. As an inert gas, introducing nitrogen can avoid the interference of gases such as oxygen to the reaction and protect the smooth progress of the reaction. According to needs, other inert gases such as helium can also be introduced. Stirring at a stable rotational speed can promote the full mixing of the reaction liquid and the uniform progress of the reaction.

[0027] S2. Add 10 - 20 parts of polyamine to the reaction system, and raise the temperature of the reaction system to 140 - 150 °C for condensation reaction for 4 - 6 h. The polyamine is preferably one or more of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine. The polyamine reacts with the fatty acid, and intermolecular dehydration occurs to obtain an amide.

[0028] S3. Raise the temperature of the reaction system to 175 - 185 °C and continue the reaction for 2 - 3 h to form a single - imidazole five - membered ring by intramolecular dehydration.

[0029] S4. Lower the reaction system to room temperature, add 0.25 - 0.5 parts of catalyst, and then heat the reaction system to 210 - 220 °C and react for 4 - 6 h. Under the catalysis, dehydration occurs between the single imidazole five-membered ring and the amide molecule to obtain a bis-imidazoline five-membered ring. The catalyst is preferably phosphoric acid and / or boric acid.

[0030] S5. Cool the reaction system to 80 - 90 °C, add 60 - 120 parts of sodium 3-chloro-2-hydroxypropyl sulfonate, and carry out a sulfonation addition reaction for 2 - 4 h to obtain the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0031] Compared with the prior art, the beneficial effects of the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided by this application are as follows: As a foaming agent, it has excellent foaming performance. The foam in the prepared foam liquid is stable, with a high liquid-carrying capacity, and it also has good performance in terms of salt tolerance, temperature resistance, and oil tolerance, which is better than the foaming agents in the prior art and is suitable for different environments such as oil and gas wells and shale gas wells. In addition to the foaming performance, it also has excellent bactericidal, corrosion inhibition, and scale inhibition effects, achieving multiple effects with one agent and having very powerful comprehensive performance.

[0032] Judging from the data, the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided by this application, when used in a brine containing 16% sodium chloride and 4% potassium chloride by mass fraction, in a high-temperature environment of 180 °C, and in a high-oil environment containing 40% condensate oil by volume fraction, its foaming performance is not affected at all. The initial foam height after foaming reaches more than 123 mm, the foam height after 5 min reaches more than 94 mm, and the liquid-carrying capacity reaches more than 126 mL / 15 min. Moreover, the bactericidal rate reaches 100%, the corrosion inhibition rate reaches more than 85%, and the scale inhibition rate reaches more than 90%. These data prove the superiority of this application. Detailed implementation manners

[0033] To make the purpose, technical solutions, and advantages of this application clearer and more understandable, the following further details this application in combination with embodiments. The illustrative implementation manners and descriptions of this application are only used to explain this application and do not limit this application. Any product identical or similar to this application obtained by anyone under the inspiration of this application or by combining the features of this application with other prior art features falls within the protection scope of this application.

[0034] For the specific experimental steps or conditions not specified in the embodiments, the operations or conditions of the conventional experimental steps described in the prior art in this field can be followed. For the reagents and other instruments not indicating the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0035] Example 1: The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage provided in Example 1 comprises the following components in percentage by weight: 1% of diniconazole, 3% of a 2×10 4 g / mol polyaspartic acid, 0.2% polyvinyl alcohol 1788, 10% bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5% heavy alkylbenzene sulfonate sodium, 5% ninal, and the balance is water.

[0036] The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage is prepared by the following method.

[0037] First, prepare the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant: S11, taking 80 parts of oleic acid and 10 parts of toluene by mass, placing them in a reaction kettle with condensation reflux function, introducing nitrogen into the reaction system, and setting the stirring speed at 100 rpm for 10 minutes; S12, adding 10 parts of triethylenetetramine to the reaction system, heating the reaction system to 140°C, and carrying out condensation reaction for 4 hours; S13, raising the temperature of the reaction system to 175°C and continuing the reaction for 2h; S14, cooling the reaction system to room temperature, adding 0.25 parts of phosphoric acid, and then heating the reaction system to 210° C. and reacting for 4 hours; S15, cooling the reaction system to 80° C., adding 60 parts of sodium 3-chloro-2-hydroxypropyl sulfonate, and carrying out sulfonation addition reaction for 2 hours to obtain a bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0038] It should be noted that nitrogen is passed into the reaction system and stirred at a speed of 100 rpm. The entire reaction process is continued from the time when the raw material is initially added to the reactor. The nitrogen continuously passed can drive out the air or other gases in the reactor. Nitrogen is an inert gas. The introduction of nitrogen can avoid the interference of gases such as oxygen on the reaction and protect the smooth progress of the reaction. As needed, other inert gases such as helium can also be passed, and the present application is preferably nitrogen. Stirring at a stable speed can promote the reaction solution to be fully mixed and promote the reaction to proceed evenly.

[0039] Then, prepare the bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage: S21, add 75.8 kg of water into the reactor, heat to 60° C. and stir at 300 rpm; S22, adding 0.2 kg of polyvinyl alcohol 1788 to the reactor at a uniform speed, setting the adding speed according to the amount added and the equipment condition, so that the polyvinyl alcohol 1788 is just added to the reactor in 30 minutes, and then continuing to stir for 30 minutes; S23, cool the reaction system to 30°C, add 3 kg of an average relative molecular weight of 2×104 Polyaspartic acid at g / mol, and the feeding rate is also set according to the dosage and equipment conditions, so that all the polyaspartic acid is just added into the reaction kettle in 30 minutes, and then stirring is continued for 30 min; S24. Add 5 kg of heavy alkylbenzene sulfonate to the reaction kettle and continue stirring for 30 min; S25. Reduce the rotation speed to 100 rpm, and sequentially add 1 kg of diniconazole, 10 kg of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 5 kg of Ninol to the reaction kettle, and continue stirring for 30 min. Then stop stirring and cool down to room temperature to obtain a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage.

[0040] Example 2: The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided by Example 2 comprises the following components in mass percentage: 1.5% of myclobutanil, 4% of polystyrene sulfonic acid with an average relative molecular mass of 3×10 4 g / mol, 0.6% of polyvinyl alcohol 1792, 13% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 7% of sodium dodecylbenzenesulfonate, 7% of Ninol, and the balance is water.

[0041] This bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared by the following method.

[0042] First, prepare bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant: S11. Take 120 parts of lauric acid and 20 parts of xylene by mass and place them in a reaction kettle with a condensation reflux function. Pass nitrogen into the reaction system and set the stirring speed at 300 rpm for 30 minutes; S12. Add 20 parts of tetraethylenepentamine to the reaction system, heat the reaction system to 150 °C, and carry out a condensation reaction for 6 h; S13. Heat the reaction system to 185 °C and continue the reaction for 3 h; S14. Cool the reaction system to room temperature, add 0.5 part of boric acid, then heat the reaction system to 220 °C, and react for 6 h; S15. Cool the reaction system to 90 °C, add 120 parts of 3-chloro-2-hydroxypropyl sulfonate, and carry out a sulfonation addition reaction for 4 h to obtain bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0043] It should be noted that nitrogen is introduced into the reaction system and stirred at a speed of 300rpm. The entire reaction process is continued from the time when the raw material is initially added to the reactor. The nitrogen continuously introduced can drive out the air or other gases in the reactor. Nitrogen is an inert gas. The introduction of nitrogen can avoid the interference of gases such as oxygen on the reaction and protect the smooth progress of the reaction. As needed, other inert gases such as helium can also be introduced, and the present application is preferably nitrogen. Stirring at a stable speed can promote the reaction solution to be fully mixed and promote the reaction to proceed evenly.

[0044] Then, prepare the bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage: S21, add 66.9 kg of water into the reactor, heat to 80° C. and stir at 600 rpm; S22, adding 0.6 kg of polyvinyl alcohol 1792 to the reactor at a uniform speed, setting the adding speed according to the amount added and the equipment condition, so that the polyvinyl alcohol 1792 is just added to the reactor in 45 minutes, and then continuing to stir for 45 minutes; S23, cool the reaction system to 40°C, add 4 kg of an average relative molecular weight of 3×10 4 g / mol polystyrene sulfonic acid, the addition rate is also set according to the amount and equipment conditions, so that the polystyrene sulfonic acid is fully added to the reactor in 45 minutes, and then stirring is continued for 45 minutes; S24, add 7kg of sodium dodecylbenzene sulfonate into the reactor and continue stirring for 45min; S25, reduce the speed to 300rpm, add 1.5kg of myclobutanil, 13kg of bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 7kg of ninar to the reactor, and continue stirring for 45min. Then stop stirring and cool to room temperature to obtain a bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage.

[0045] Embodiment 3: The foam drainage sterilizing, corrosion inhibiting and scale inhibiting foaming agent provided in Example 3 comprises the following components in percentage by weight: 2% of triadimenol, 5% of a 50% hydroxyl radical having an average relative molecular mass of 5×10 4 g / mol polyaspartic acid, 1% polyvinyl alcohol 1788, 18% bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 10% heavy alkylbenzene sulfonate sodium, 10% ninal, and the balance is water.

[0046] The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage is prepared by the following method.

[0047] First, prepare the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant: S11. Take 90 parts by mass of stearic acid, 7 parts of toluene, and 8 parts of xylene and place them in a reaction kettle with a condensing reflux function. Introduce nitrogen into the reaction system and set the stirring speed at 200 rpm for 20 minutes. S12. Add 15 parts of diethylenetriamine to the reaction system, heat the reaction system to 145 °C, and carry out a condensation reaction for 5 h. S13. Heat the reaction system to 180 °C and continue the reaction for 2.5 h. S14. Cool the reaction system to room temperature, add 0.2 part of phosphoric acid and 0.2 part of boric acid, then heat the reaction system to 215 °C and react for 5 h. S15. Cool the reaction system to 85 °C, add 90 parts of sodium 3-chloro-2-hydroxypropyl sulfonate, and carry out a sulfonation addition reaction for 3 h to obtain the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0048] It should be noted that nitrogen is introduced into the reaction system and stirring is maintained at a speed of 200 rpm, starting from the initial addition of raw materials to the reaction kettle and continuing throughout the reaction process. The continuously introduced nitrogen can expel air or other gases in the reaction kettle. As an inert gas, nitrogen can avoid the interference of gases such as oxygen on the reaction and protect the smooth progress of the reaction. According to needs, other inert gases such as helium can also be introduced. In this application, nitrogen is preferably used. Stirring at a stable speed can promote the full mixing of the reaction solution and the uniform progress of the reaction.

[0049] Then, prepare a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage: S21. Add 54 kg of water to the reaction kettle, heat it to 70 °C and maintain stirring at a speed of 600 rpm. S22. Uniformly add 1 kg of polyvinyl alcohol 1788 to the reaction kettle. Set the addition speed according to the addition amount and equipment conditions so that polyvinyl alcohol 1788 is just completely added to the reaction kettle in 60 minutes, and then continue stirring for 60 min. S23. Cool the reaction system to 50 °C, add 5 kg of polyaspartic acid with an average relative molecular mass of 5×10 4 g / mol to the reaction kettle. Similarly, set the addition speed according to the addition amount and equipment conditions so that polyaspartic acid is just completely added to the reaction kettle in 60 minutes, and then continue stirring for 60 min. S24. Add 10 kg of heavy alkyl benzene sulfonate to the reaction kettle and continue stirring for 60 min. S25. Reduce the speed to 200 rpm, sequentially add 2 kg of triadimefon, 18 kg of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 10 kg of Ninol to the reaction kettle, and continue stirring for 60 min. Then stop stirring and cool to room temperature to obtain a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage.

[0050] Example 4: The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided in Example 4 comprises components in the following mass percentages: 0.6% of bitertanol, 0.6% of diniconazole, 1.8% of polyaspartic acid with an average relative molecular mass of 3×10 4 g / mol, 1.8% of polystyrenesulfonic acid with an average relative molecular mass of 4×10 4 g / mol, 0.25% of polyvinyl alcohol 1788, 0.25% of polyvinyl alcohol 1792, 14% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 3.5% of heavy alkylbenzene sulfonate, 3.5% of sodium dodecylbenzene sulfonate, 6% of Ninol, and the balance is water.

[0051] The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared by the following method.

[0052] First, prepare the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant: S11. By mass, take 45 parts of stearic acid, 45 parts of oleic acid, and 18 parts of toluene and place them in a reaction kettle with a condensation reflux function. Introduce nitrogen into the reaction system and set the stirring speed at 180 rpm for 18 minutes; S12. Add 8 parts of tetraethylenepentamine and 8 parts of triethylenetetramine to the reaction system, heat the reaction system to 146°C, and carry out a condensation reaction for 4.5 h; S13. Heat the reaction system to 182°C and continue the reaction for 2.5 h; S14. Cool the reaction system to room temperature, add 0.4 part of phosphoric acid, then heat the reaction system to 215°C, and react for 4.5 h; S15. Cool the reaction system to 88°C, add 90 parts of 3-chloro-2-hydroxypropyl sulfonate, and carry out a sulfonation addition reaction for 3.5 h to obtain the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0053] It should be noted that nitrogen is introduced into the reaction system and stirred at a constant speed of 180 rpm, starting from the initial addition of raw materials to the reaction kettle and lasting throughout the reaction process. The continuously introduced nitrogen can expel air or other gases in the reaction kettle. As an inert gas, nitrogen can avoid the interference of gases such as oxygen on the reaction and protect the smooth progress of the reaction. According to needs, other inert gases such as helium can also be introduced. In this application, nitrogen is preferably used. Stirring at a stable speed can promote the full mixing of the reaction solution and the uniform progress of the reaction.

[0054] Then, prepare the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage: S21. Add 67.7 kg of water to the reactor, heat it to 65 °C and stir at a speed of 400 rpm; S22. Slowly add 0.25 kg of polyvinyl alcohol 1788 and 0.25 kg of polyvinyl alcohol 1792 to the reactor. Set the addition speed according to the addition amount and the equipment conditions so that the polyvinyl alcohol is just completely added to the reactor in 40 minutes, and then continue stirring for 40 min; S23. Cool the reaction system to 35 °C, and add 1.8 kg of polyaspartic acid with an average relative molecular mass of 3×10 4 g / mol and 1.8 kg of polystyrenesulfonic acid with an average relative molecular mass of 4×10 4 g / mol to the reactor. Similarly, set the addition speed according to the addition amount and the equipment conditions so that it is just completely added to the reactor in 40 minutes, and then continue stirring for 40 min; S24. Add 3.5 kg of heavy alkylbenzene sulfonate and 3.5 kg of dodecylbenzene sulfonate to the reactor, and continue stirring for 40 min; S25. Reduce the speed to 180 rpm, and sequentially add 0.6 kg of bitertanol, 0.6 kg of diniconazole, 14 kg of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 6 kg of Ninol to the reactor, and continue stirring for 40 min. Then stop stirring and cool to room temperature to obtain a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage.

[0055] Example 5: The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided in Example 5 comprises the following components in mass percentage: 0.3% of diniconazole, 0.3% of myclobutanil, 0.3% of triadimefon, 0.3% of bitertanol, 2% of polyaspartic acid with an average relative molecular mass of 3×10 4 g / mol, 2.5% of polystyrenesulfonic acid with an average relative molecular mass of 4×10 4 g / mol, 0.4% of polyvinyl alcohol 1788, 0.4% of polyvinyl alcohol 1792, 15% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 4% of heavy alkylbenzene sulfonate, 5% of dodecylbenzene sulfonate, 9% of Ninol, and the balance is water.

[0056] The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared by the following method.

[0057] First, prepare bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant: S11. By mass, take 60 parts of lauric acid, 45 parts of oleic acid, and 18 parts of xylene and place them in a reactor with a condensation reflux function. Introduce nitrogen into the reaction system and set the stirring speed at 220 rpm for 25 minutes; S12, add 5 parts of diethylenetriamine, 5 parts of triethylenetetramine, and 5 parts of tetraethylenepentamine to the reaction system, heat the reaction system to 146°C, and carry out condensation reaction for 5.5 hours; S13, raising the temperature of the reaction system to 180°C and continuing the reaction for 2.5h; S14, cooling the reaction system to room temperature, adding 0.2 parts of phosphoric acid and 0.2 parts of boric acid, and then heating the reaction system to 215°C and reacting for 4.5 hours; S15, cooling the reaction system to 88° C., adding 105 parts of sodium 3-chloro-2-hydroxypropyl sulfonate, and carrying out sulfonation addition reaction for 3 hours to obtain a bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0058] It should be noted that nitrogen is passed into the reaction system and stirred at a speed of 220rpm. The entire reaction process is continued from the time when the raw material is initially added to the reactor. The nitrogen continuously passed can drive out the air or other gases in the reactor. Nitrogen is an inert gas. The introduction of nitrogen can avoid the interference of gases such as oxygen on the reaction and protect the smooth progress of the reaction. As needed, other inert gases such as helium can also be passed, and the application is preferably nitrogen. Stirring at a stable speed can promote the reaction solution to be fully mixed and promote the reaction to proceed evenly.

[0059] Then, prepare the bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage: S21, add 60.5 kg of water into the reactor, heat to 75 ° C and keep stirring at 500 rpm; S22, add 0.4 kg of polyvinyl alcohol 1788 and 0.4 kg of polyvinyl alcohol 1792 to the reactor at a uniform speed, set the adding speed according to the amount added and the equipment condition, so that all of them are added to the reactor in 50 minutes, and then continue stirring for 50 minutes; S23, cool the reaction system to 45°C, add 2 kg of 3×10 4 g / mol of polyaspartic acid and an average relative molecular weight of 4×10 4 g / mol polystyrene sulfonic acid, the addition rate was set according to the addition amount and equipment conditions so that it took 55 minutes to add all of it into the reactor, and then stirring was continued for 55 minutes; S24, add 4kg of heavy alkyl benzene sodium sulfonate and 5kg of sodium dodecyl benzene sulfonate into the reactor, and continue stirring for 55min; S25. Reduce the rotational speed to 180 rpm, and sequentially add 0.3 kg of diniconazole, 0.3 kg of myclobutanil, 0.3 kg of triadimenol, 0.3 kg of bitertanol, 15 kg of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 9 kg of Ninol into the reaction kettle, and continue stirring for 55 min. Then stop stirring and cool down to room temperature to obtain the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage.

[0060] Comparative Example 1: Except for not using diniconazole, prepare the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage according to the method, raw materials and dosages of Example 1 to obtain the product.

[0061] That is, the product in Comparative Example 1 includes the following components in mass percentage: 3% of polyaspartic acid with an average relative molecular mass of 2×10 4 g / mol, 0.2% of polyvinyl alcohol 1788, 10% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5% of heavy alkyl benzene sulfonate, 5% of Ninol, and the balance is water.

[0062] Comparative Example 2: Prepare the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage according to the method, raw materials and dosages of Example 2, except that hydroxyethane diphosphonic acid is used to replace polystyrene sulfonic acid to obtain the product.

[0063] That is, the product in Comparative Example 2 includes the following components in mass percentage: 1.5% of myclobutanil, 4% of hydroxyethane diphosphonic acid with an average relative molecular mass of 3×10 4 g / mol, 0.6% of polyvinyl alcohol 1792, 13% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 7% of sodium dodecylbenzene sulfonate, 7% of Ninol, and the balance is water.

[0064] Comparative Example 3: Prepare the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage according to the method, raw materials and dosages of Example 3, except that polyvinyl alcohol 1788 is not used to obtain the product.

[0065] That is, the product in Comparative Example 3 includes the following components in mass percentage: 2% of triadimenol, 5% of polyaspartic acid with an average relative molecular mass of 5×10 4 g / mol, 18% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 10% of heavy alkyl benzene sulfonate, 10% of Ninol, and the balance is water.

[0066] Comparative Example 4: The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage was prepared according to the method, raw materials and dosages of Example 4, except that imidazoline with the brand of CORR and the model of LP (manufactured by Chengdu Launpus Technology Co., Ltd.) purchased commercially was used to replace the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant to obtain the product.

[0067] That is, the product in Comparative Example 4 includes the following components by mass percentage: 0.6% of bitertanol, 0.6% of diniconazole, 1.8% of polyaspartic acid with an average relative molecular mass of 3×10 4 g / mol, 1.8% of polystyrene sulfonic acid with an average relative molecular mass of 4×10 4 g / mol, 0.25% of polyvinyl alcohol 1788, 0.25% of polyvinyl alcohol 1792, 14% of imidazoline, 3.5% of heavy alkylbenzene sulfonate, 3.5% of sodium dodecylbenzene sulfonate, 6% of Ninol, and the balance is water.

[0068] Comparative Example 5: The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage was prepared according to the method, raw materials and dosages of Example 5, except that dodecyl betaine was used to replace the heavy alkylbenzene sulfonate, sodium dodecylbenzene sulfonate and Ninol in the original formula to obtain the product.

[0069] That is, the product in Comparative Example 5 includes the following components by mass percentage: 0.3% of diniconazole, 0.3% of myclobutanil, 0.3% of triadimenol, 0.3% of bitertanol, 2% of polyaspartic acid with an average relative molecular mass of 3×10 4 g / mol, 2.5% of polystyrene sulfonic acid with an average relative molecular mass of 4×10 4 g / mol, 0.4% of polyvinyl alcohol 1788, 0.4% of polyvinyl alcohol 1792, 15% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 18% of dodecyl betaine, and the balance is water.

[0070] Next, the bactericidal corrosion inhibitor and scale inhibitor foaming agents obtained in Examples 1-5 and Comparative Examples 1-5 will be subjected to performance tests.

[0071] Referring to the provisions of NB / T 11045.3—2023, prepare several clean 100 mL beakers and several clean 1000 mL volumetric flasks and make marks. Weigh 1.00 g of the foaming agent into the beakers respectively, dissolve them with the same volume and the same water sample, and then transfer them to the volumetric flasks for constant volume respectively for comparative experiments.

[0072] A total of three groups of water samples are set up, as follows.

[0073] The water quality of the first group of water samples is shown in the following table, and this water sample is called gas field water: Total salinity mg / L Potassium ion + Sodium ion mg / L Calcium ion mg / L Magnesium ion mg / L Chloride ion mg / L Carbonate ion mg / L Bicarbonate ion mg / L Other ions mg / L Hydrogen sulfide mg / L 112171 34571 1032 884 58346 96 340 16902 218 For the second group of water samples, sodium chloride with a mass fraction of 16% and potassium chloride with a mass fraction of 4% are dissolved in deionized water to prepare a water sample, which is called mineralized water.

[0074] For the third group of water samples, 60% by volume of gas field water and 40% by volume of condensate oil are mixed evenly to prepare a water sample, which is called water-oil mixed water.

[0075] Test index 1: Foaming ability and foam stability Take the foaming agents prepared in Examples 1-5 and Comparative Examples 1-5 and add them to the water samples to make solutions. Fill them into polytetrafluoroethylene digestion bottles or stainless steel tanks with polytetrafluoroethylene linings, put them into an oven, age at a certain temperature for 24 h, and cool to room temperature. According to the method specified in GB / T 13173, measure the initial foam height and the foam height after 5 min of the aged foaming agent solution at 85.0 °C. The test results obtained are shown in the following table: Serial number Water sample Foaming agent Aging temperature / °C Initial foam height / mm Foam height after 5 min / mm 1 Gas field water Example 1 120 126 98 2 Gas field water Comparative example 1 120 125 98 3 Gas field water Example 2 120 139 108 4 Gas field water Comparative example 2 120 115 78 5 Gas field water Example 3 120 151 119 6 Gas field water Comparative example 3 120 121 100 7 Gas field water Example 4 120 138 109 8 Gas field water Comparative example 4 120 118 79 9 Gas field water Example 5 120 130 105 10 Gas field water Comparative example 5 120 117 77 11 Mineralized water Example 1 120 125 97 12 Mineralized water Example 2 120 137 107 13 Mineralized water Example 3 120 150 119 14 Mineralized water Example 4 120 136 107 15 Mineralized water Example 5 120 129 105 16 Water-oil mixed water Example 1 120 127 94 17 Water-oil mixed water Example 2 120 139 104 18 Water-oil mixed water Example 3 120 152 113 19 Water-oil mixed water Example 4 120 139 103 20 Water-oil mixed water Example 5 120 130 100 21 Gas field water Example 1 150 125 96 22 Gas field water Example 2 150 136 105 23 Gas field water Example 3 150 148 116 24 Gas field water Example 4 150 137 107 25 Gas field water Example 5 150 129 103 26 Gas field water Example 1 180 123 95 27 Gas field water Example 2 180 135 104 28 Gas field water Example 3 180 145 114 29 Gas field water Example 4 180 135 105 30 Gas field water Example 5 180 126 101 The initial foam height characterizes the foaming ability of the foaming agent, and the foam height after 5 min characterizes the foam stability after foaming. From the above table, the foaming performance, salt tolerance, oil resistance and temperature resistance of the foaming agent can be intuitively evaluated.

[0076] Specifically, at 120 °C, the values of No. 1, 3, 5, 7, and 9 are not very different, and the values are relatively high, especially the value of Example 3 is the highest. It proves that the foaming agent provided by this application has stable performance, excellent foaming performance, and strong foam stability. From the comparison of the five groups of data of No. 1-2, 3-4, 5-6, 7-8, and 9-10, diniconazole basically has no influence on the foaming performance of the foaming agent, while polystyrene sulfonic acid, polyvinyl alcohol, bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, heavy alkyl benzene sulfonate, sodium dodecyl benzene sulfonate and Ninol all have a positive influence on the foaming ability of the foaming agent. When these components do not exist or are replaced by other components, the foaming ability and foam stability decrease significantly. Especially the data comparison between Example 3 and Comparative Example 3 shows that the foaming ability decreases by more than 19%, which proves the importance of polyvinyl alcohol in this application. In terms of foam stability, the data gap ratio between Example 2 and Comparative Example 2, and Example 4 and Comparative Example 4 is very large, more than 27%, which proves that polystyrene sulfonic acid and the self-made bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant in this application bring a significant improvement to the foam stability.

[0077] At the same temperature of 120°C, the foaming agents prepared in Examples 1-5 are used in gas field water for No. 1, 3, 5, 7, 9, and Nos. 10-20 are respectively used in mineralized water and water-oil mixture. By comparing the three groups of data, it can be seen that the values under mineralized water and water-oil mixture are basically no different from those in gas field water, and the values of Example 3 are the highest in all cases. This data also corresponds to the highest value of Example 3 in gas field water. It can be proved that the foaming agent provided in this application has excellent salt tolerance and oil resistance. In high-salt and high-oil environments, the foaming ability and foam stability are not affected, and the stability is excellent.

[0078] The values of the foaming ability and foam stability of the foaming agents in Examples 1-5 at 120°C, 150°C, and 180°C are shown as No. 1, 3, 5, 7, 9, 21-30 respectively. It can be seen from the table that although the values of foaming ability and foam stability both decrease with the increase of temperature, the decrease amplitude is extremely small. From 120°C to 180°C, the decrease amplitude is generally 3-4 mm, and the highest is 6 mm. Generally speaking, the foaming agent provided in this application maintains stable performance in the environment of 120°C to 180°C and basically does not decline, which also proves that the foaming agent has excellent thermal stability.

[0079] Test Index 2: Liquid-carrying capacity According to the method for measuring the liquid-carrying capacity of foam specified in Appendix B of NB / T 11045.3—2023, 200 mL of the aged foaming agent solution in the aforementioned experiment is respectively placed into the measuring device, preheated at 85°C for 15 min, 5 mL of defoaming agent solution is added to the foam collector, the circulating cooling water of the foam collector is turned on, the gas source is opened, the flow rate of the flowmeter is adjusted to 3.0 L / min, and the gas is allowed to enter the foaming tube to generate foam and be carried out by the air flow. Measure the volume of the liquid after defoaming in the foam collector at room temperature after 15 min, and deduct the volume of the added defoaming agent solution when reading the liquid volume, which is the liquid-carrying capacity. The test results are shown in the following table: Serial number Water sample Foaming agent Liquid-carrying capacity / mL 1 Gas field water Example 1 130 2 Gas field water Comparative example 1 130 3 Gas field water Example 2 142 4 Gas field water Comparative example 2 121 5 Gas field water Example 3 153 6 Gas field water Comparative example 3 125 7 Gas field water Example 4 141 8 Gas field water Comparative example 4 119 9 Gas field water Example 5 147 10 Gas field water Comparative example 5 124 11 Mineralized water Example 1 128 12 Mineralized water Example 2 140 13 Mineralized water Example 3 150 14 Mineralized water Example 4 139 15 Mineralized water Example 5 145 16 Water-oil mixed water Example 1 126 17 Water-oil mixed water Example 2 139 18 Water-oil mixed water Example 3 148 19 Water-oil mixed water Example 4 137 20 Water-oil mixed water Example 5 141 It can be seen from No. 1, 3, 5, 7, 9, 11-20 in the above table that no matter what water sample is used, the foaming agent has a high liquid-carrying capacity, which proves that the foaming agent provided in this application has a high ability to carry liquid and can carry a large amount of liquid, facilitating liquid drainage. And from the comparison of the four groups of data of No. 3-4, 5-6, 7-8, 9-10, it can be seen that the liquid-carrying capacity of Comparative Examples 2-5 has decreased significantly compared with that of Examples 2-5, which proves the superiority of this application. Especially, the gap between Example 3 and Comparative Example 3 is the largest, reaching more than 18%, which proves that polyvinyl alcohol has an impact on the liquid-carrying capacity in the formula of this application.

[0080] Test Index 3: Corrosion rate According to the method specified in SY / T 5886-2018, the static corrosion rate of the foaming agent solution on N80 carbon steel under atmospheric pressure was tested, and the corrosion inhibition rate of the foaming agent was evaluated. The corrosion inhibition rate was calculated by the following formula: Corrosion inhibition rate = (corrosion rate before adding the foaming agent to the water used for preparing the solution - corrosion rate after adding the foaming agent to the water used for preparing the solution) / corrosion rate before adding the foaming agent to the water used for preparing the solution × 100%.

[0081] The test results are shown in the following table: Serial number Water sample Foaming agent Testing temperature / °C Corrosion inhibition rate / % 1 Gas field water Example 1 85 90.3 2 Gas field water Example 2 85 94.5 3 Gas field water Example 3 85 97.3 4 Gas field water Example 4 85 94.8 5 Gas field water Example 5 85 96.9 6 Gas field water Example 1 120 89.1 7 Gas field water Example 2 120 94.0 8 Gas field water Example 3 120 97.1 9 Gas field water Example 4 120 94.2 10 Gas field water Example 5 120 96.2 11 Gas field water Example 1 150 87.3 12 Gas field water Example 2 150 92.2 13 Gas field water Example 3 150 96.0 14 Gas field water Example 4 150 92.4 15 Gas field water Example 5 150 94.1 16 Gas field water Example 1 180 85.0 17 Gas field water Example 2 180 90.1 18 Gas field water Example 3 180 94.6 19 Gas field water Example 4 180 90.0 20 Gas field water Example 5 180 92.5 As can be seen from the above table, whether under the conditions of 85 °C, 120 °C, 150 °C or 180 °C, the foaming agents provided in Examples 1-5 of the present application all have excellent corrosion inhibition rates. At the same temperature, the foaming agent prepared in Example 3 has the highest corrosion inhibition rate and the best corrosion inhibition effect.

[0082] Test index 4: Bactericidal rate According to the method specified in SY / T 0532-2012, the bacterial content before and after adding the foaming agent to the water used for preparing the solution was tested. The bactericidal rate was calculated by the following formula: Bactericidal rate = (bacterial content before adding the foaming agent to the water used for preparing the solution - bacterial content after adding the foaming agent to the water used for preparing the solution) / bacterial content before adding the foaming agent to the water used for preparing the solution × 100%.

[0083] The test results are shown in the following table:

[0084] As can be seen from the above table, the foaming agents provided in Examples 1-5 of the present application have a bactericidal rate of 100% and excellent bactericidal effects. The reason for such good bactericidal effects is that the foaming agents provided in the examples of the present application use triazole fungicides that affect ergosterol biosynthesis, which synergistically act with the amphoteric ion surfactant of bis-imidazoline sulfonated quaternary ammonium salt, can quickly bind to and destroy the bacterial cell wall and membrane system, achieve sterilization, and significantly improve the bactericidal effect of the foaming agent.

[0085] In Comparative Example 1, diniconazole with bactericidal effects (the formula includes amphoteric ion surfactant of bis-imidazoline sulfonated quaternary ammonium salt) is not used, while in Comparative Example 4, conventional imidazoline is used to replace the self-made bis-imidazoline sulfonated quaternary ammonium salt amphoteric ion surfactant of the present application (the formula includes bitertanol and diniconazole with bactericidal effects). The bactericidal effects are both average, indicating that without using fungicides or only using fungicides, the bactericidal effects are ordinary; only by using them simultaneously can they have synergistic effects and exert good bactericidal effects.

[0086] Test index 5: Scale inhibition rate According to the method specified in GB / T 16632-2019, the calcium carbonate scale inhibition rate of the foaming agent on the test water sample was measured. The measurement results are shown in the following table: Water sample Foaming agent Scale inhibition rate / % Gas field water Example 1 90.0 Gas field water Example 2 93.5 Gas field water Example 3 95.2 Gas field water Example 4 93.3 Gas field water Example 5 94.5 The above table proves that the foaming agents provided in Examples 1-5 of this application have excellent scale inhibition performance, can effectively reduce the accumulation of bottom-hole liquid and the deposition of calcium carbonate scale around, avoid channel blockage, and thus improve production output.

[0087] The foregoing is only the preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage, characterized in that: The composition comprises the following components in percentage by mass: 1%-2% of triazole fungicide, 3%-5% of scale inhibitor, 0.2%-1% of polyvinyl alcohol, 10%-18% of bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5%-10% of benzene sulfonate, 5%-10% of ninar, and the balance is water.

2. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 1, characterized in that: The triazole fungicide is one or more of diniconazole, myclobutanil, triadimenol and bisbenzimidazole.

3. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 1, characterized in that: The scale inhibitor is at least one of polyaspartic acid and polystyrene sulfonic acid; the polyvinyl alcohol is at least one of polyvinyl alcohol 1788 and polyvinyl alcohol 1792.

4. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 1, characterized in that: The molecular structure of the bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant is shown in formula (1): Formula (1); Wherein, R represents a C11-C17 fatty acid, and n is 2-8.

5. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 1, characterized in that: The benzene sulfonate is at least one of sodium heavy alkyl benzene sulfonate and sodium dodecyl benzene sulfonate.

6. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 4, characterized in that: The bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant is prepared by the following method: S1. By weight, 80-120 parts of fatty acid and 10-20 parts of water-carrying agent are placed in a reaction kettle, and an inert gas is introduced therein and stirred to fully mix the raw materials; S2, add 10-20 parts of polyamine, raise the temperature to 140-150°C, and react for 4-6 hours; S3, continue to heat to 175-185°C, react for 2-3h; S4, cool to room temperature, add 0.25-0.5 parts of catalyst, then heat to 210-220°C and react for 4-6 hours; S5. Cool down to 80-90°C, add 60-120 parts of sodium 3-chloro-2-hydroxypropyl sulfonate, and react for 2-4 hours.

7. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 6, characterized in that: In step S1, the fatty acid is one or more of oleic acid, lauric acid, and stearic acid.

8. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 6, characterized in that: In the step S2, the polyamine is one or more of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.

9. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 6, characterized in that: In step S4, the catalyst is at least one of phosphoric acid and boric acid.

10. A method for preparing the bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage as claimed in claim 1, characterized in that: The following steps are involved: S1. Add water to the reactor, heat to 60-80°C and stir; S2, add polyvinyl alcohol to the reactor and continue stirring for 30-60 minutes; S3, cool the reaction system to 30-50°C, add antiscalant to the reactor, and continue stirring for 30-60 minutes; S4, add benzenesulfonate to the reactor and continue stirring for 30-60 minutes; S5, reduce the stirring speed, add triazole fungicide, bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and ninar to the reactor in sequence, continue stirring for 30-60 minutes; then stop stirring and cool to room temperature.

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