A bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage and its preparation method

Abstract

The present application relates to a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage and a preparation method thereof, belonging to the technical field of oil and gas development. The bactericidal corrosion inhibitor and scale inhibitor foaming agent comprises the following components in mass percentage: 1% - 2% of triazole bactericide, 3% - 5% of scale inhibitor, 0.2% - 1% of polyvinyl alcohol, 10% - 18% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5% - 10% of benzenesulfonate, 5% - 10% of Ninol, and the balance is water. It has good foaming performance, the foam in the prepared foam liquid is stable and the liquid carrying capacity is very high, and it has good performance in salt tolerance, temperature resistance and oil tolerance, and has better performance than the foaming agents of the prior art, and is applicable to different environments such as oil and gas wells and shale gas wells. Moreover, in addition to the foaming performance, it also has excellent bactericidal, corrosion inhibition and scale inhibition effects, realizing multiple effects with one agent, and the comprehensive performance is very powerful.

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, lead to a reduction in the production of oil and gas wells and shale gas wells, and even cause production stoppage.

[0003] Foam drainage is a commonly used measure to remove bottom-hole liquid accumulation, and has the advantages of low cost and simple process. Its principle is: injecting the foaming agent from the wellhead of the 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 increases. For example, some bottom-hole liquid accumulations contain a large amount of inorganic salts, bacteria, hydrogen sulfide or carbon dioxide, etc., and contain condensate oil, organic sediments, etc. and have a high degree of mineralization. The existing conventional foaming agents cannot effectively generate 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 has multiple functions such as sterilization, corrosion inhibition, scale inhibition, and foaming, is suitable for complex bottom-hole environments such as high temperature and high condensate oil content, has good foaming effect, is convenient for subsequent liquid drainage, and then realizes the effective production of oil and gas wells and shale gas wells.

[0006] The embodiments of the present application are implemented as follows:

[0007] The embodiments of the present application provide a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage, including the following components in mass percentage:

[0008] 1% - 2% of triazole bactericides, and the triazole bactericides are one or more of diniconazole, myclobutanil, triadimenol, and bitertanol.

[0009] 3% - 5% scale inhibitor, 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, with better solubility and lower requirements for the preparation process.

[0010] 0.2% - 1% polyvinyl alcohol, the polyvinyl alcohol is polyvinyl alcohol 1788 and / or polyvinyl alcohol 1792, with better solubility and a more concise preparation process.

[0011] 10% - 18% of bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant is self - made by the applicant, and its structural formula is as shown in formula (1):

[0012] Formula (1);

[0013] In formula (1), R represents a fatty acid of C11 - C17, and n is 2 - 8;

[0014] The bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant provided by the applicant has the dual effects 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 good salt tolerance, high temperature resistance, and excellent bactericidal effect.

[0015] 5% - 10% of benzene sulfonate, the benzene sulfonate is at least one of heavy alkyl benzene sulfonate and sodium dodecyl benzene sulfonate. The benzene sulfonate 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.

[0016] 5% - 10% of Ninol, and the balance is water.

[0017] The foam - drainage bactericidal corrosion - inhibiting and scale - inhibiting 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, and is 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 broad market prospects.

[0018] The principle is that the simultaneous use of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant and triazole fungicide can quickly combine with and destroy the cell walls, cell membranes and other structures of fungi and bacteria, and effectively block the synthesis of ergosterol, effectively killing bacteria and hindering their reproduction, significantly improving the bactericidal effect of the foaming agent.

[0019] As scale inhibitors, polyaspartic acid and polystyrene sulfonic acid not only have a good scale inhibition effect, but also, based on their molecular configuration, they 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 improving the stability of the foam; and 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.

[0020] The applicant's unique bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant has a gemini surfactant structure, resulting in high surface activity and strong foaming ability. It can form an adsorption film on the tubing surface, thereby isolating and hindering contact between corrosive media (such as bottomhole fluids and acidic natural gas) and the tubing matrix, thereby simultaneously performing the dual functions of foaming and corrosion inhibition. Furthermore, the presence of the zwitterion improves its compatibility with other surfactant components, enhances salt tolerance, and broadens its application range.

[0021] The bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactants synergistically enhance the foaming ability and foam stability of the foaming agent under various working conditions. Benzenesulfonate provides strong electrostatic repulsion, which can reduce surface tension and quickly adsorb to the gas-liquid interface to form an initial foam layer. Ninal enhances intermolecular adhesion through hydrogen bonding and hydrophobic interactions, filling the molecular gaps of other surfactants, reducing interfacial film fluidity and reducing bubble merging. Its long-chain structure also increases liquid film viscosity. The unique double hydrophilic head group and double hydrophobic chain structure of the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactants can form a tighter interfacial arrangement. The electrostatic neutralization effect of the zwitterions reduces the charge repulsion of the benzenesulfonate surfactant, while forming mixed micelles with Ninal, significantly enhancing the mechanical strength of the interfacial film.

[0022] The present application also provides a method for preparing a bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage, comprising the following steps:

[0023] S1. Add measured water by mass percentage into the reactor, heat to 60-80° C. and stir. The stirring speed is preferably 300-600 rpm.

[0024] S2. Slowly add 0.2%-1% of polyvinyl alcohol into the reactor at a uniform speed. Set the addition speed according to the addition amount and the equipment conditions 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 at a uniform speed and stirring at a fixed speed 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 addition speed in this application can promote the uniform and stable dissolution of polyvinyl alcohol in the reaction solution.

[0025] S3. Cool the reaction system to 30-50°C, add 3%-5% of the scale inhibitor into the reactor, and also set the addition speed according to the addition amount and the equipment conditions 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 avoids the problem of 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.

[0026] In step S3, cooling to 30-50°C 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, the temperature can also be directly reduced to room temperature. The dissolution speed of the scale inhibitor and subsequent components becomes slower, and it is necessary to stir for a longer time to make them fully dissolve and evenly disperse; after full dissolution, the efficacy of the foaming agent provided by this method is the same as that of the original method.

[0027] S4. Add 5%-10% of benzenesulfonate into the reactor and continue stirring for 30-60 minutes. The benzenesulfonate is at least one of heavy alkylbenzene sulfonate and sodium dodecylbenzenesulfonate.

[0028] S5. Reduce the rotational speed to 100 - 300 rpm, and sequentially add 1% - 2% of triazole fungicide, 10% - 18% of bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 5% - 10% of 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.

[0029] This method has a simple process, has low requirements for the environment and equipment, is suitable for industrial application, and has high market value.

[0030] Furthermore, the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant is prepared by the following method:

[0031] S1. By mass, put 80 - 120 parts of fatty acid and 10 - 20 parts of water - carrying agent into a reaction kettle. The reaction kettle is preferably a reaction kettle with a condensing reflux function; introduce an inert gas into the reaction system and stir to make the raw materials fully mixed evenly. 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.

[0032] 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 the initial addition of raw materials into the reaction kettle until the end of the reaction to obtain the product.

[0033] 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 on 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.

[0034] S2. Add 10 - 20 parts of polyamine into the reaction system, heat the reaction system to 140 - 150 °C, and carry out a 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.

[0035] S3. Heat 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.

[0036] S4. Cool 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.

[0037] 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.

[0038] 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:

[0039] 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 of 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.

[0040] Judging from the data, the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided by this application, when used in a salt solution 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

[0041] To make the purpose, technical solutions, and advantages of this application clearer, the following further details this application with reference to the embodiments. The illustrative implementation manners of this application and their descriptions are only used to explain this application and do not limit this application. Any product that is the same as or similar to this application obtained by anyone under the inspiration of this application or by combining the features of this application with those of other prior arts falls within the protection scope of this application.

[0042] 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.

[0043] Example 1:

[0044] The bactericidal, corrosion - inhibiting, scale - inhibiting and foaming agent for foam drainage provided in Example 1 comprises components in the following mass percentages: 1% of diniconazole, 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.

[0045] This bactericidal, corrosion - inhibiting, scale - inhibiting and foaming agent for foam drainage is prepared by the following method.

[0046] First, prepare the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant:

[0047] S11: Take 80 parts by mass of oleic acid and 10 parts by mass 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 100 rpm for 10 minutes.

[0048] S12: Add 10 parts by mass of triethylenetetramine to the reaction system, raise the temperature of the reaction system to 140 °C, and carry out a condensation reaction for 4 h.

[0049] S13: Raise the temperature of the reaction system to 175 °C and continue the reaction for 2 h.

[0050] S14: Cool the reaction system to room temperature, add 0.25 parts by mass of phosphoric acid, then raise the temperature of the reaction system to 210 °C, and react for 4 h.

[0051] S15: Cool the reaction system to 80 °C, add 60 parts by mass of 3 - chloro - 2 - hydroxypropyl sulfonate, and carry out a sulfonation addition reaction for 2 h to obtain the bis - imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0052] It should be noted that nitrogen is introduced into the reaction system and stirred at a constant speed of 100 rpm. This is carried out continuously from the initial addition of raw materials to the reaction kettle 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.

[0053] Then, prepare the bactericidal, corrosion - inhibiting, scale - inhibiting and foaming agent for foam drainage:

[0054] S21: Add 75.8 kg of water to the reaction kettle, heat it to 60 °C and keep stirring at a speed of 300 rpm.

[0055] S22. Uniformly add 0.2 kg of polyvinyl alcohol 1788 into the reaction kettle, set the addition speed according to the addition amount and equipment conditions, so that the polyvinyl alcohol 1788 is just completely added into the reaction kettle in 30 minutes, and then continue to stir for 30 min;

[0056] S23. Cool down the reaction system to 30 °C, add 3 kg of polyaspartic acid with an average relative molecular mass of 2×10 4 g / mol into the reaction kettle. Similarly, set the addition speed according to the addition amount and equipment conditions, so that the polyaspartic acid is just completely added into the reaction kettle in 30 minutes, and then continue to stir for 30 min;

[0057] S24. Add 5 kg of heavy alkylbenzene sulfonate into the reaction kettle and continue to stir for 30 min;

[0058] S25. Reduce the rotation speed to 100 rpm, add 1 kg of diniconazole, 10 kg of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 5 kg of Ninol into the reaction kettle in sequence, and continue to stir 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.

[0059] Example 2:

[0060] The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided by Example 2 includes the following components by 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.

[0061] This bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared by the following method.

[0062] First, prepare bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant:

[0063] S11. Take 120 parts of lauric acid and 20 parts of xylene by mass, place them in a reaction kettle with a condensation reflux function, introduce nitrogen into the reaction system, and set the rotation speed to 300 rpm and stir for 30 minutes;

[0064] S12. Add 20 parts of tetraethylenepentamine into the reaction system, heat up the reaction system to 150 °C, and carry out a condensation reaction for 6 h;

[0065] S13. Heat up the reaction system to 185 °C and continue to react for 3 h;

[0066] S14. Cool down the reaction system to room temperature, add 0.5 parts of boric acid, and then heat the reaction system to 220 °C and react for 6 h;

[0067] S15. Cool down the reaction system to 90 °C, add 120 parts of sodium 3-chloro-2-hydroxypropyl sulfonate, and carry out sulfonation addition reaction for 4 h to obtain the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0068] It should be noted that nitrogen gas is introduced into the reaction system and stirred at a speed of 300 rpm. It is continuously introduced throughout the reaction process starting from the initial addition of raw materials into the reaction kettle. The continuously introduced nitrogen gas can expel the air or other gases in the reaction kettle. As an inert gas, nitrogen gas 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. Nitrogen gas is preferred in this application. Stirring at a stable speed can promote the full mixing of the reaction solution and the uniform progress of the reaction.

[0069] Then, prepare the bactericidal corrosion inhibition and scale inhibition foaming agent for foam drainage:

[0070] S21. Add 66.9 kg of water to the reaction kettle, heat it to 80 °C and stir at a speed of 600 rpm;

[0071] S22. Uniformly add 0.6 kg of polyvinyl alcohol 1792 to the reaction kettle, set the addition speed according to the addition amount and equipment conditions, so that the polyvinyl alcohol 1792 is just completely added to the reaction kettle in 45 minutes, and then continue stirring for 45 min;

[0072] S23. Cool down the reaction system to 40 °C, add 4 kg of polystyrene sulfonic acid with an average relative molecular weight of 3×10 4 g / mol to the reaction kettle. Similarly, set the addition speed according to the addition amount and equipment conditions, so that the polystyrene sulfonic acid is just completely added to the reaction kettle in 45 minutes, and then continue stirring for 45 min;

[0073] S24. Add 7 kg of sodium dodecylbenzenesulfonate to the reaction kettle and continue stirring for 45 min;

[0074] S25. Reduce the speed to 300 rpm, add 1.5 kg of myclobutanil, 13 kg of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 7 kg of Ninol to the reaction kettle in sequence, and continue stirring for 45 min. Then stop stirring and cool down to room temperature to obtain the bactericidal corrosion inhibition and scale inhibition foaming agent for foam drainage.

[0075] Example 3:

[0076] The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage provided in Example 3 comprises components in the following mass percentages: 2% of triadimenol, 5% of polyaspartic acid with an average relative molecular mass of 5×10 4 g / mol, 1% of polyvinyl alcohol 1788, 18% of bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 10% of heavy alkyl benzene sulfonate, 10% of Ninol, and the balance being water.

[0077] The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared by the following method.

[0078] First, prepare the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant:

[0079] 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 condensation reflux function. Introduce nitrogen into the reaction system and set the stirring speed at 200 rpm for 20 minutes.

[0080] S12. Add 15 parts by mass of diethylenetriamine to the reaction system, raise the temperature of the reaction system to 145°C, and carry out a condensation reaction for 5 h.

[0081] S13. Raise the temperature of the reaction system to 180°C and continue the reaction for 2.5 h.

[0082] S14. Cool the reaction system to room temperature, add 0.2 part of phosphoric acid and 0.2 part of boric acid, then raise the temperature of the reaction system to 215°C and react for 5 h.

[0083] S15. Cool the reaction system to 85°C, add 90 parts by mass of 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.

[0084] It should be noted that nitrogen is introduced into the reaction system and the stirring is maintained at a speed of 200 rpm, starting from the initial addition of raw materials to the reaction kettle and lasting throughout the entire reaction process. The continuously introduced nitrogen can expel the air or other gases in the reaction kettle. As an inert gas, 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. In this application, nitrogen is preferably used. Stirring at a stable speed can promote the full mixing of the reaction liquid and the uniform progress of the reaction.

[0085] Then, prepare the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage:

[0086] S21. Add 54 kg of water to the reaction kettle, heat it to 70°C and maintain the stirring speed at 600 rpm.

[0087] S22. Add 1 kg of polyvinyl alcohol 1788 into the reaction kettle at a constant speed. Set the feeding speed according to the feeding amount and the equipment condition so that the polyvinyl alcohol 1788 is just completely added into the reaction kettle in 60 minutes, and then continue stirring for 60 min;

[0088] S23. Cool down the reaction system to 50 °C, and add 5 kg of polyaspartic acid with an average relative molecular mass of 5×10 4 g / mol into the reaction kettle. Similarly, set the feeding speed according to the feeding amount and the equipment condition so that the polyaspartic acid is just completely added into the reaction kettle in 60 minutes, and then continue stirring for 60 min;

[0089] S24. Add 10 kg of heavy alkyl benzene sulfonate into the reaction kettle and continue stirring for 60 min;

[0090] S25. Reduce the rotation speed to 200 rpm, and add 2 kg of triadimefon, 18 kg of bis(imidazoline) sulfonated quaternary ammonium salt zwitterionic surfactant, and 10 kg of Ninol into the reaction kettle in sequence, and continue stirring for 60 min. Then stop stirring and cool down to room temperature to obtain the bactericidal corrosion inhibition and scale inhibition foaming agent for foam drainage.

[0091] Example 4:

[0092] The bactericidal corrosion inhibition and scale inhibition foaming agent for foam drainage provided by Example 4 comprises the following components in mass percentage: 0.6% of bisbenzotriazole alcohol, 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 alkyl benzene sulfonate, 3.5% of dodecyl benzene sulfonate, 6% of Ninol, and the balance is water.

[0093] This bactericidal corrosion inhibition and scale inhibition foaming agent for foam drainage is prepared by the following method.

[0094] First, prepare the bis(imidazoline) sulfonated quaternary ammonium salt zwitterionic surfactant:

[0095] S11. Take 45 parts of stearic acid, 45 parts of oleic acid, and 18 parts of toluene by mass 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;

[0096] S12. Add 8 parts of tetraethylenepentamine and 8 parts of triethylenetetramine into the reaction system, heat up the reaction system to 146 °C, and carry out a condensation reaction for 4.5 h;

[0097] S13. Heat the reaction system to 182 °C and continue the reaction for 2.5 h;

[0098] 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;

[0099] S15. Cool the reaction system to 88 °C, add 90 parts of 3-chloro-2-hydroxypropyl sulfonate sodium, and carry out sulfonation addition reaction for 3.5 h to obtain the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant.

[0100] It should be noted that nitrogen is introduced into the reaction system and stirred at a speed of 180 rpm. Starting from the initial addition of raw materials into the reaction kettle, it continues 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.

[0101] Then, prepare a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage:

[0102] S21. Add 67.7 kg of water to the reaction kettle, heat it to 65 °C and stir at a speed of 400 rpm;

[0103] S22. Uniformly add 0.25 kg of polyvinyl alcohol 1788 and 0.25 kg of polyvinyl alcohol 1792 to the reaction kettle. Set the addition speed according to the addition amount and equipment conditions so that the polyvinyl alcohol is just completely added to the reaction kettle in 40 minutes, and then continue stirring for 40 min;

[0104] S23. Cool the reaction system to 35 °C, add 1.8 kg of polyaspartic acid with an average relative molecular weight of 3×10 4 g / mol and 1.8 kg of polystyrene sulfonic acid with an average relative molecular weight of 4×10 4 g / mol to the reaction kettle. Similarly, set the addition speed according to the addition amount and equipment conditions so that it is just completely added to the reaction kettle in 40 minutes, and then continue stirring for 40 min;

[0105] S24. Add 3.5 kg of heavy alkyl benzene sulfonate and 3.5 kg of dodecyl benzene sulfonate to the reaction kettle and continue stirring for 40 min;

[0106] S25. Reduce the rotational 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 into the reaction kettle, and continue stirring for 40 min. Then stop stirring and cool down to room temperature to obtain the bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage.

[0107] Example 5:

[0108] 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 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, 4% of heavy alkylbenzene sulfonate, 5% of sodium dodecylbenzene sulfonate, 9% of Ninol, and the balance is water.

[0109] The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared by the following method.

[0110] First, prepare the bis(imidazoline) sulfonated quaternary ammonium salt zwitterionic surfactant:

[0111] S11. Take 60 parts by mass of lauric acid, 45 parts by mass of oleic acid, and 18 parts by mass of xylene and place them in a reaction kettle with a condensation reflux function. Introduce nitrogen into the reaction system and set the rotational speed at 220 rpm and stir for 25 minutes;

[0112] S12. Add 5 parts by mass of diethylenetriamine, 5 parts by mass of triethylenetetramine, and 5 parts by mass of tetraethylenepentamine into the reaction system, heat the reaction system to 146 °C, and carry out a condensation reaction for 5.5 h;

[0113] S13. Heat the reaction system to 180 °C and continue the reaction for 2.5 h;

[0114] S14. Cool the reaction system to room temperature, add 0.2 parts by mass of phosphoric acid and 0.2 parts by mass of boric acid, then heat the reaction system to 215 °C, and react for 4.5 h;

[0115] S15. Cool the reaction system to 88 °C, add 105 parts by mass of 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.

[0116] Note that nitrogen is introduced into the reaction system and stirred at a speed of 220 rpm. This is maintained throughout the reaction process starting from the initial addition of the raw materials to the reaction kettle. The continuously introduced nitrogen can expel air or other gases in the reaction kettle. As an inert gas, nitrogen can avoid interference from 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. 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.

[0117] Then, a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage is prepared:

[0118] S21. Add 60.5 kg of water to the reaction kettle, heat it to 75 °C and stir at a speed of 500 rpm;

[0119] S22. Uniformly add 0.4 kg of polyvinyl alcohol 1788 and 0.4 kg of polyvinyl alcohol 1792 to the reaction kettle. Set the addition speed according to the addition amount and equipment conditions so that it takes exactly 50 minutes to be completely added to the reaction kettle, and then continue stirring for 50 min;

[0120] S23. Cool the reaction system to 45 °C, and add 2 kg of polyaspartic acid with an average relative molecular weight of 3×10 4 g / mol and polystyrene sulfonic acid with an average relative molecular weight of 4×10 4 g / mol to the reaction kettle. Similarly, set the addition speed according to the addition amount and equipment conditions so that it takes exactly 55 minutes to be completely added to the reaction kettle, and then continue stirring for 55 min;

[0121] S24. Add 4 kg of heavy alkylbenzene sulfonate and 5 kg of sodium dodecylbenzene sulfonate to the reaction kettle, and continue stirring for 55 min;

[0122] S25. Reduce the 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 bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, and 9 kg of ninol to the reaction kettle, and continue stirring for 55 min. Then stop stirring and cool to room temperature to obtain a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage.

[0123] Comparative Example 1:

[0124] A bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage was prepared according to the method, raw materials and dosages of Example 1 except that diniconazole was not used or included, and the product was obtained.

[0125] That is, the product in Comparative Example 1 includes the following components by mass percentage: 3% of polyaspartic acid with an average relative molecular weight of 2×10 4Polyaspartic acid at g / mol, 0.2% polyvinyl alcohol 1788, 10% bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5% heavy alkyl benzene sulfonate, 5% Ninol, with the balance being water.

[0126] Comparative Example 2:

[0127] Prepare a bactericidal corrosion and scale inhibition foaming agent for foam drainage according to the method, raw materials and dosage of Example 2, except that hydroxyethylidene diphosphonic acid is used to replace polystyrene sulfonic acid to obtain the product.

[0128] That is, the product in Comparative Example 2 includes the following components by mass percentage: 1.5% myclobutanil, 4% hydroxyethylidene diphosphonic acid with an average relative molecular mass of 3×10 4 g / mol, 0.6% polyvinyl alcohol 1792, 13% bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 7% sodium dodecyl benzene sulfonate, 7% Ninol, with the balance being water.

[0129] Comparative Example 3:

[0130] Prepare a bactericidal corrosion and scale inhibition foaming agent for foam drainage according to the method, raw materials and dosage of Example 3, except that polyvinyl alcohol 1788 is not used to obtain the product.

[0131] That is, the product in Comparative Example 3 includes the following components by mass percentage: 2% triadimefon, 5% polyaspartic acid with an average relative molecular mass of 5×10 4 g / mol, 18% bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 10% heavy alkyl benzene sulfonate, 10% Ninol, with the balance being water.

[0132] Comparative Example 4:

[0133] Prepare a bactericidal corrosion and scale inhibition foaming agent for foam drainage according to the method, raw materials and dosage of Example 4, except that imidazoline with the brand of CORR and model of LP purchased commercially (manufacturer: Chengdu Laonpus Technology Co., Ltd.) is used to replace the bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant to obtain the product.

[0134] That is, the product in Comparative Example 4 includes the following components by mass percentage: 0.6% biphenyltriazole alcohol, 0.6% diniconazole, 1.8% polyaspartic acid with an average relative molecular mass of 3×10 4 g / mol, 1.8% with an average relative molecular mass of 4×10 4Polystyrene sulfonic acid at g / mol, 0.25% polyvinyl alcohol 1788, 0.25% polyvinyl alcohol 1792, 14% imidazoline, 3.5% heavy alkylbenzene sulfonate, 3.5% sodium dodecylbenzene sulfonate, 6% Ninol, with the balance being water.

[0135] Comparative Example 5:

[0136] Prepare a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage according to the method, raw materials and dosages of Example 5, except that dodecyl betaine is used to replace the heavy alkylbenzene sulfonate, sodium dodecylbenzene sulfonate and Ninol in the original formula to obtain the product.

[0137] That is, the product in Comparative Example 5 includes the following components by mass percentage: 0.3% diniconazole, 0.3% myclobutanil, 0.3% triadimenol, 0.3% 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% polyvinyl alcohol 1788, 0.4% polyvinyl alcohol 1792, 15% bis-imidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 18% dodecyl betaine, with the balance being water.

[0138] Next, performance tests will be carried out on the bactericidal corrosion inhibitor and scale inhibitor foaming agents for foam drainage obtained in Examples 1-5 and Comparative Examples 1-5.

[0139] Refer 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 volume fixing respectively to conduct comparative experiments.

[0140] A total of three groups of water samples are set up, as follows.

[0141] 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:

[0142] 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

[0143] For the second group of water samples, dissolve sodium chloride with a mass fraction of 16% and potassium chloride with a mass fraction of 4% in deionized water to prepare the water sample, and this water sample is called mineralized water.

[0144] For the third group of water samples, mix 60% gas field water and 40% condensate oil by volume to prepare the water sample, and this water sample is called water-oil mixed water.

[0145] Test Index 1: Foaming ability and foam stability

[0146] The foaming agents prepared in Examples 1-5 and Comparative Examples 1-5 were added to the water sample to form a solution, which was then filled into a polytetrafluoroethylene digestion flask or a stainless-steel tank with a polytetrafluoroethylene lining, placed in an oven, aged at a certain temperature for 24 h, and cooled to room temperature. According to the method specified in GB / T 13173, the initial foam height and the foam height after 5 min of the aged foaming agent solution were measured at 85.0 °C. The test results obtained are shown in the following table:

[0147] 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

[0148] 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.

[0149] 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 effect on the foaming ability of the foaming agent. When these components are absent or replaced by other components, the foaming ability and foam stability decrease significantly. Especially the comparison of the data of 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.

[0150] At the same 120 °C, No. 1, 3, 5, 7, and 9 are the foaming agents prepared in Examples 1-5 used in gas field water, and No. 10-20 are used in mineralized water and water-oil mixture water respectively. By comparing the three groups of data, it can be seen that the values under mineralized water and water-oil mixture water have basically no difference from those in gas field water, and the value of Example 3 is the highest, which also corresponds to the highest value of Example 3 in gas field water. It can be proved that the foaming agent provided by this application has excellent salt tolerance and oil resistance, and in a high-salt environment and a high-oil environment, the foaming ability and foam stability are not affected, and the stability is excellent.

[0151] Serial numbers 1, 3, 5, 7, 9, 21 - 30 are 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 environments respectively. It can be seen from the table that although both the foaming ability and foam stability values decrease as the temperature increases, 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.

[0152] Test Index 2: Liquid - carrying capacity

[0153] According to the method for measuring the liquid - carrying capacity of foam specified in Appendix B of NB / T 11045.3—2023, take 200 mL of the foaming agent solution aged in the aforementioned experiment and place it into the measuring device respectively. Preheat it at 85 °C for 15 min. Add 5 mL of defoaming agent solution into the foam collector. Turn on the circulating cooling water of the foam collector, open the gas source, adjust the flow rate of the flowmeter to 3.0 L / min, let the gas enter the foaming tube, generate foam and be carried out by the air flow. Measure the volume of the liquid after the foam breaks in the foam collector at room temperature after 15 min. When reading the liquid volume, deduct the volume of the added defoaming agent solution, which is the liquid - carrying capacity. The test results are shown in the following table:

[0154] 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

[0155] It can be seen from serial numbers 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, can carry a large amount of liquid, and is convenient for liquid drainage. And from the comparison of the four groups of data of serial numbers 3 - 4, 5 - 6, 7 - 8, and 9 - 10, it can be seen that the liquid - carrying capacity of Comparative Examples 2 - 5 decreases 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.

[0156] Test Index 3: Corrosion rate

[0157] According to the method specified in SY / T 5886 - 2018, test the static corrosion rate of the foaming agent solution on N80 carbon steel under normal pressure to evaluate the corrosion inhibition rate of the foaming agent. The corrosion inhibition rate is calculated by the following formula:

[0158] Corrosion inhibition rate = (Corrosion rate of the water used for preparing the solution before adding the foaming agent - Corrosion rate of the water used for preparing the solution after adding the foaming agent) / Corrosion rate of the water used for preparing the solution before adding the foaming agent × 100%.

[0159] The test results are shown in the following table:

[0160] 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

[0161] As can be seen from the above table, the foaming agents provided in Examples 1-5 of the present application have excellent corrosion inhibition rates under the conditions of 85°C, 120°C, 150°C or 180°C. At the same temperature, the foaming agent prepared in Example 3 has the highest corrosion inhibition rate and the best corrosion inhibition effect.

[0162] Test Index 4: Bactericidal Rate

[0163] According to the method specified in SY / T 0532-2012, the bacterial content of the water used for preparing the solution before and after adding the foaming agent was tested. The bactericidal rate is calculated by the following formula:

[0164] 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%.

[0165] The test results are shown in the following table:

[0166]

[0167] 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 the bactericidal effect is excellent. The reason for such a good bactericidal effect is that the foaming agent provided in the examples of the present application uses a triazole fungicide that affects ergosterol biosynthesis, which synergistically acts with the bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 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.

[0168] In Comparative Example 1, diniconazole with bactericidal effect was not used (the formulation includes bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant), while in Comparative Example 4, the self-made bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant of the present application was replaced with conventional imidazoline (the formulation includes bitertanol and diniconazole with bactericidal effect), and the bactericidal effects were both average, indicating that without using a fungicide or only using a fungicide, the bactericidal effect is ordinary; only by using them simultaneously can synergistic effects be achieved and a good bactericidal effect be exerted.

[0169] Test Index 5: Scale Inhibition Rate

[0170] 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 determined. The test results are shown in the following table:

[0171] 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

[0172] The above table proves that the foaming agents provided in Embodiments 1-5 of the present application have excellent scale inhibition performance, can effectively reduce the bottom-hole liquid accumulation and the deposition of calcium carbonate scale around, avoid channel blockage, and thus improve the production output.

[0173] The foregoing is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage, characterized in that The composition comprises the following components in percentage by mass: 1%-2% of a triazole fungicide, 3%-5% of a scale inhibitor, 0.2%-1% of polyvinyl alcohol, 10%-18% of a bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant, 5%-10% of benzenesulfonate, 5%-10% of ninal, and the balance is water; Wherein, the triazole fungicide is one or more of diniconazole, myclobutanil, triadimenol, and bisbenzisin; the scale inhibitor is at least one of polyaspartic acid and polystyrene sulfonic acid; The bisimidazoline sulfonated quaternary ammonium salt zwitterionic surfactant is prepared by the following method: S1. Place 80-120 parts by mass of fatty acid and 10-20 parts of water-carrying agent in a reactor, introduce inert gas therein and stir to mix the raw materials thoroughly; S2, adding 10-20 parts of polyamine, heating to 140-150 ° C, and reacting for 4-6 hours; the polyamine is at least one of triethylenetetramine and tetraethylenepentamine; S3, continue to heat to 175-185 ° C, react for 2-3 hours; S4, cooling to room temperature, adding 0.25-0.5 parts of catalyst, and then heating to 210-220 ° C, and reacting 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.

2. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 1, characterized in that: The polyvinyl alcohol is at least one of polyvinyl alcohol 1788 and polyvinyl alcohol 1792.

3. 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.

4. The bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage according to claim 1, characterized in that, In step S1, the fatty acid is one or more of oleic acid, lauric acid, and stearic acid.

5. The bactericidal, corrosion-inhibiting and scale-inhibiting foaming agent for foam drainage according to claim 1, characterized in that: In step S4, the catalyst is at least one of phosphoric acid and boric acid.

6. A preparation method of a bactericidal corrosion inhibitor and scale inhibitor foaming agent for foam drainage as described 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 Ninal to the reactor in sequence, and continue stirring for 30-60 minutes; then stop stirring and cool to room temperature.

Images