Foaming agent with corrosion and scale inhibition function for oil and gas exploitation and preparation method thereof

Abstract

The disclosure provides an oil and gas development foaming agent with corrosion and scale inhibition function and a preparation method thereof, and relates to the technical field of material science and engineering. The preparation method comprises the following steps: mixing isophorone diisocyanate, polycaprolactone diol, castor oil, 2,2-dimethylol butyric acid, dibutyltin dilaurate and methyl methacrylate to obtain a first mixture; adding hydroxyethyl acrylate to the first mixture to obtain a second mixture; adding a predetermined solution to the second mixture to obtain a third mixture; adding an aqueous potassium persulfate solution dropwise to the third mixture to obtain a polyurethane acrylate composite emulsion; mixing the polyurethane acrylate composite emulsion with isopropyl alcohol to obtain a fourth mixture; and mixing the fourth mixture, an amido tertiary amine, sodium chloroacetate, a scale inhibitor and a freezing point regulator to obtain the oil and gas development foaming agent. The disclosure can provide the oil and gas development foaming agent with corrosion and scale inhibition function.

Description

Technical Field

[0001] This disclosure relates to the fields of materials science and engineering technology, and more specifically, to a foaming agent for oil and gas extraction with anti-corrosion and scale inhibition functions and its preparation method. Background Technology

[0002] The continuous development of society has led to a significant increase in the demand for oil and natural gas. During natural gas extraction, as extraction progresses, a series of problems arise, including reservoir depletion, decreased bottomhole pressure, reduced critical fluid carrying capacity, and the generation of acidized water during fracturing. This results in low efficiency of gas transport from the wellbore to the surface. Traditional methods such as mechanical extraction or utilizing natural pressure differentials are ineffective in low-pressure or aging gas wells. Foaming agents can increase gas ascent velocity, thereby improving production efficiency and playing a crucial role in oil and gas extraction, especially in the safe extraction of low-pressure oil and gas reservoirs, where they can reduce drilling fluid density by forming stable foam.

[0003] However, gas well extraction faces many corrosion problems. For example, scale formation is a significant issue, especially in water with high mineral concentrations. In hard water, metal ions such as calcium, magnesium, and barium easily combine with anions like carbonate and sulfate to form scale, which coats equipment surfaces. This not only reduces heat transfer efficiency but also exacerbates localized corrosion. The oil and gas extraction environment also contains corrosive gases such as H2S and CO2, as well as high concentrations of Cl-. - SO4 2- Corrosive media can easily lead to electrochemical corrosion of mining equipment and pipelines.

[0004] Currently, the foaming performance of foaming agents is easily affected by corrosion products or scale buildup during long-term use, leading to a deterioration. Metal ions generated by corrosion may complex with foaming agent molecules, destroying their surface activity, while deposited scale can block the gas-liquid interface for foam formation, reducing foam stability.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this disclosure is to provide a foaming agent for oil and gas development with anti-corrosion and scale inhibition functions and its preparation method, thereby overcoming, at least to some extent, the problem of poor quality of foaming agent products.

[0007] According to a first aspect of this disclosure, a method for preparing an oil and gas development foaming agent with anti-corrosion and scale-inhibiting functions is provided, comprising: mixing isophorone diisocyanate, polycaprolactone diol, castor oil, 2,2-dimethylolbutyric acid, dibutyltin dilaurate, and methyl methacrylate, and performing a first reaction process to obtain a first mixture; adding hydroxyethyl acrylate to the first mixture and performing a second reaction process to obtain a second mixture; adding a predetermined solution to the second mixture and performing a third reaction process to obtain a third mixture; wherein the predetermined solution is composed of sodium aminosulfonate water-soluble chain extender, imidazoline quaternary ammonium salt, sodium hydroxide, and water; adding potassium persulfate aqueous solution dropwise to the third mixture to obtain a polyurethane acrylate composite emulsion; mixing the polyurethane acrylate composite emulsion with isopropanol to obtain a fourth mixture; and mixing the fourth mixture, an amide tertiary amine, sodium chloroacetate, a scale inhibitor, and a pour point regulator, and performing a fourth reaction process to obtain the oil and gas development foaming agent.

[0008] Optionally, isophorone diisocyanate, polycaprolactone diol, castor oil, 2,2-dimethylolbutyric acid, dibutyltin dilaurate, and methyl methacrylate are mixed and subjected to a first reaction process to obtain a first mixture, comprising: mixing 10 parts by weight of isophorone diisocyanate, 10 parts by weight of polycaprolactone diol, 3 parts by weight of castor oil, 3 parts by weight of 2,2-dimethylolbutyric acid, 0.05 parts by weight of dibutyltin dilaurate, and 15 parts by weight of methyl methacrylate, and reacting at 75°C for 3 hours to obtain the first mixture.

[0009] Optionally, hydroxyethyl acrylate is added to the first mixture to perform a second reaction process to obtain a second mixture, comprising: adding 1 part by weight of hydroxyethyl acrylate to the first mixture, reacting at 75°C for 1 hour, and cooling to 35°C to obtain the second mixture.

[0010] Optionally, the preparation method further includes: mixing 7 parts by weight of sodium aminosulfonate water-soluble chain extender, 5 parts by weight of imidazoline quaternary ammonium salt, 0.4 parts by weight of sodium hydroxide and 125 parts by weight to obtain a predetermined solution.

[0011] Optionally, potassium persulfate aqueous solution is added dropwise to the third mixture to obtain a polyurethane acrylate composite emulsion, comprising: controlling the reaction temperature at 70°C, adding 20 parts by weight of potassium persulfate aqueous solution with a mass fraction of 1% to the third mixture, the addition time being 30 min; and keeping warm for 2 h after the addition is completed to obtain the polyurethane acrylate composite emulsion.

[0012] Optionally, the polyurethane acrylate composite emulsion is mixed with isopropanol to obtain a fourth mixture, comprising: mixing the polyurethane acrylate composite emulsion with isopropanol in a volume ratio of 3:1 to obtain the fourth mixture.

[0013] Optionally, the fourth mixture, amide-based tertiary amine, sodium chloroacetate, scale inhibitor, and pour point regulator are mixed and the fourth reaction process is carried out to obtain an oil and gas development foaming agent, comprising: mixing 120 parts by weight of the fourth mixture, 30-50 parts by amide-based tertiary amine, 20-25 parts by weight of sodium chloroacetate, 2-3 parts by weight of scale inhibitor, and 3-6 parts by weight of pour point regulator, heating to dissolve, reacting at 70-85°C for 3-5 hours, adjusting the pH to 8-9 using sodium hydroxide solution, and cooling to room temperature to obtain the oil and gas development foaming agent.

[0014] Optionally, adjusting the pH to 8-9 using a sodium hydroxide solution includes adjusting the pH to 8-9 every 20-30 minutes using a 10% sodium hydroxide solution.

[0015] Optionally, the scale inhibitor is one or a mixture of polyaspartic acid, polyepoxysuccinic acid, and γ-glutamic acid; and / or the pour point regulator is one or a mixture of ethylene glycol, propylene glycol, polyethylene glycol, and glycerol.

[0016] According to a second aspect of this disclosure, an oil and gas development foaming agent with anti-corrosion and scale inhibition functions is provided, which is prepared by any of the above-mentioned methods for preparing an oil and gas development foaming agent with anti-corrosion and scale inhibition functions.

[0017] In this embodiment, on one hand, a "WPUA polymer matrix-corrosion inhibitor" composite structure is formed by reacting the core corrosion inhibitor component, imidazoline quaternary ammonium salt, with sodium aminosulfonate chain extender and polyurethane acrylate (WPUA) prepolymer. Introducing the imidazoline quaternary ammonium salt into the chain segment structure of WPUA via free radical polymerization effectively prevents its free precipitation, achieving uniform molecular-level dispersion of the corrosion inhibitor component within the system. This solves the problems of stratification, sedimentation, and uneven dispersion caused by polarity differences in the traditional physical mixing method of "foaming agent + corrosion / scale inhibitor". On the other hand, the foaming agent prepared in this embodiment is betaine-type, formed by reacting amide-based tertiary amines with sodium chloroacetate and different carbon chain lengths. The amide-based tertiary amines are selected from derivatives with different carbon chain structures, such as coconut oil, lauric acid, and oleic acid. The hydrophobic chain length of the foaming agent can be adjusted according to the viscosity of the crude oil in the reservoir (e.g., light oil, heavy oil), ensuring that the foam can effectively carry crude oil of different viscosities out of the reservoir. The foaming and foam-stabilizing properties of the foaming agent are adjusted by utilizing the carbon chain length. Simultaneously, WPUA composite emulsion is used as a solvent during the synthesis process. The polymer segments in the WPUA composite emulsion can be adsorbed onto the surface of the foam liquid film, significantly improving the foam half-life by increasing the liquid film viscosity and inhibiting the liquid film drainage rate. Meanwhile, the hydrophobic segments of the imidazoline quaternary ammonium salt help reduce the gas-liquid interfacial tension, further enhancing the foaming effect, forming a synergistic foaming mechanism of "foaming agent-led foaming + WPUA-assisted foam stabilization + corrosion inhibitor-synergistic reduction of interfacial tension". Furthermore, this disclosure utilizes the WPUA composite emulsion to form a dense adsorption film on the metal surface. The nitrogen atoms of the imidazoline quaternary ammonium salt form coordination bonds with the empty orbitals on the metal surface, thereby strengthening the film adhesion and improving the corrosion inhibition efficiency of the pipeline during construction. At the same time, the scale inhibitor exerts its scale inhibition effect by chelating metal ions and interfering with scale crystal growth. The dispersibility of WPUA prevents the scale inhibitor from agglomerating on the metal surface, ensuring uniform contact with scale ions. The synergistic effect of both significantly improves the scale inhibition rate, and the corrosion-inhibiting film does not affect the ion chelating ability of the scale inhibitor. Ultimately, a comprehensive product integrating four functions—foaming and drainage, metal corrosion prevention, scale inhibition, and low-temperature antifreeze—is obtained.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1The flowchart illustrates a method for preparing a foaming agent with anti-corrosion and scale-inhibiting functions for oil and gas extraction according to an embodiment of the present disclosure.

[0021] Figure 2 The structural formula of the imidazoline quaternary ammonium salt used in the embodiments of this disclosure is shown.

[0022] Figure 3 The image shown is a SEM (Scanning Electron Microscope) image of an N80 carbon steel sheet after immersion in the foaming agent solution prepared in Example 4 of this disclosure for 168 hours.

[0023] Figure 4 The image shown is a SEM image of an N80 carbon steel sheet after being immersed in the foaming agent solution prepared in Comparative Example 3 of this disclosure for 168 hours.

[0024] Figure 5 The results of liquid carrying capacity tests for embodiments and comparative examples of this disclosure are shown in the figure.

[0025] Figure 6 The results of liquid carrying capacity tests for embodiments and comparative examples of condensate oil containing 10% are shown in the figure.

[0026] Figure 7 A schematic diagram showing the comparison of foaming performance test results between Embodiment 4 and Comparative Example 3 of this disclosure is presented. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this disclosure more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced with one or more of these specific details omitted, or other methods, processes, steps, etc., can be employed. In other instances, well-known technical solutions are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0028] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. The flowcharts shown in the drawings are merely exemplary illustrations and do not necessarily include all steps. For example, some steps may be broken down, while others may be combined or partially combined; therefore, the actual order of execution may change depending on the actual situation. Additionally, all terms such as "first," "second," "third," and "fourth" below are for distinguishing purposes only and should not be construed as limiting the content of this disclosure.

[0029] Currently, research on foaming agents mainly focuses on optimizing foam performance. Their molecular structure design primarily aims to improve foaming ability, foam stability, and compatibility with the system, with a lack of research on corrosion prevention and scale inhibition properties. To address corrosion and scaling problems, industrial applications often involve adding additional corrosion inhibitors and scale inhibitors. However, this complicates the system composition, and adding more agents can reduce some characteristics. Furthermore, the foaming performance of single-function foaming agents deteriorates over long-term use due to corrosion products or scale buildup. Metal ions generated by corrosion may complex with foaming agent molecules, destroying their surface activity, while deposited scale can block the gas-liquid interface for foam formation, reducing foam stability.

[0030] Based on this, the present disclosure provides a multifunctional foaming agent and its preparation scheme that achieves synergistic optimization of foaming, anti-corrosion and scale inhibition performance through molecular structure design, adapts to complex industrial environments, and also has environmental protection characteristics, good surface activity, liquid carrying capacity and oil and salt resistance.

[0031] refer to Figure 1 The method for preparing a foaming agent with anti-corrosion and scale inhibition functions for oil and gas extraction according to the present disclosure may include the following steps:

[0032] S102. Isophorone diisocyanate, polycaprolactone diol, castor oil, 2,2-dimethylolbutyric acid, dibutyltin dilaurate and methyl methacrylate are mixed and subjected to the first reaction process to obtain the first mixture.

[0033] In an exemplary embodiment of this disclosure, 10 parts by weight of isophorone diisocyanate (IPDI), 10 parts by weight of polycaprolactone diol (NCL), 3 parts by weight of castor oil (CO), 3 parts by weight of 2,2-dimethylolbutyric acid (DMBA), 0.05 parts by weight of dibutyltin dilaurate (DBTDL), and 15 parts by weight of methyl methacrylate (MMA) are mixed and reacted at 75°C for 3 hours to obtain a first mixture. The first reaction process refers to reacting at 75°C for 3 hours.

[0034] Alternatively, a dry three-necked flask equipped with a stirrer, thermometer, and reflux device can be selected for mixing. That is, the above-mentioned substances are added to this three-necked flask and mixed.

[0035] S104. Add hydroxyethyl acrylate to the first mixture and perform the second reaction process to obtain the second mixture.

[0036] In an exemplary embodiment of this disclosure, 1 part by weight of hydroxyethyl acrylate (HEA) is added to the first mixture, the mixture is reacted at 75°C for 1 hour, and then cooled to 35°C to obtain the second mixture. The second reaction process refers to continuing the reaction at 75°C for 1 hour, followed by cooling to 35°C.

[0037] S106. Add a predetermined solution to the second mixture and perform the third reaction process to obtain a third mixture.

[0038] According to some embodiments of this disclosure, the predetermined solution comprises a water-soluble chain extender of sodium aminosulfonate, an imidazoline quaternary ammonium salt, sodium hydroxide, and water. Specifically, by weight, 7 parts of water-soluble chain extender of sodium aminosulfonate (Poly-EPS), 5 parts of imidazoline quaternary ammonium salt, 0.4 parts of sodium hydroxide, and 125 parts of water can be mixed to obtain the predetermined solution.

[0039] For imidazoline quaternary ammonium salts Figure 2 Its structural formula is given.

[0040] Specifically, under high-speed stirring, the predetermined solution can be added to the second mixture for neutralization and emulsification, and stirred for 30 minutes to obtain the third mixture.

[0041] S108. Add potassium persulfate aqueous solution dropwise to the third mixture to obtain a polyurethane acrylate composite emulsion.

[0042] After obtaining the third mixture, the temperature was raised to 70°C, and 20 parts by weight of a 1% potassium persulfate aqueous solution were added dropwise to the third mixture over a period of 30 minutes. After the addition was complete, the mixture was kept at this temperature for 2 hours to obtain a polyurethane acrylate (WPUA) composite emulsion with corrosion-inhibiting properties.

[0043] S110. Mix the polyurethane acrylate composite emulsion with isopropanol to obtain a fourth mixture.

[0044] According to some embodiments of this disclosure, a polyurethane acrylate composite emulsion is mixed with isopropanol at a volume ratio of 3:1 to obtain a fourth mixture.

[0045] S112. The fourth mixture, amide-based tertiary amine, sodium chloroacetate, scale inhibitor, and pour point regulator are mixed, and the fourth reaction process is carried out to obtain a foaming agent for oil and gas development.

[0046] According to some embodiments of this disclosure, 120 parts by weight of a fourth mixture, 30-50 parts by weight of an amide-based tertiary amine, 20-25 parts by weight of sodium chloroacetate, 2-3 parts by weight of a scale inhibitor, and 3-6 parts by weight of a pour point regulator are mixed, heated to dissolve, reacted at 70-85°C for 3-5 hours, and the pH is adjusted to 8-9 using a sodium hydroxide solution. After cooling to room temperature, an oil and gas foaming agent is obtained. For example, the above substances can be mixed in a three-necked flask.

[0047] For pH adjustment, the pH can be adjusted to 8-9 every 20-30 minutes using a 10% sodium hydroxide solution.

[0048] In addition, the amide tertiary amine can be one or a mixture of cocamidopropyl dimethyl tertiary amine, lauryl amideopropyl dimethyl tertiary amine, palm kernel amideopropyl dimethyl tertiary amine, and oleamideopropyl dimethyl tertiary amine.

[0049] The scale inhibitor can be one or more of polyaspartic acid, polyepoxysuccinic acid, and γ-glutamic acid, or a mixture thereof.

[0050] The pour point regulator can be one or a mixture of ethylene glycol, propylene glycol, polyethylene glycol (PEG-400), and glycerol.

[0051] It should be noted that the various mixtures mentioned in the embodiments of this disclosure refer to mixtures mixed in any proportion.

[0052] This disclosure utilizes biodegradable green agents such as polyaspartic acid and polyepoxysuccinic acid, exhibiting excellent biodegradability and effectively avoiding the eutrophication problem caused by traditional phosphorus-based scale inhibitors. The corrosion inhibitor used, imidazoline quaternary ammonium salt, has low toxicity and fully complies with environmental standards for oil and gas extraction. Compared with some existing chromate-based toxic corrosion inhibitors, this disclosure demonstrates significant environmental friendliness.

[0053] Furthermore, this disclosure also provides an oil and gas foaming agent with anti-corrosion and scale inhibition functions, which is prepared by the preparation method of steps S102 to S112 described above.

[0054] The following describes Embodiment 1 of this disclosure:

[0055] Step one is the preparation of the WPUA composite emulsion. Specifically, 10 parts IPDI, 10 parts NCL, 3 parts CO, 3 parts DMBA, 0.05 parts DBTDL, and 15 parts MMA are added to a dry three-necked flask, and the mixture is reacted at 75°C for 3 hours. Then, 1 part HEA is added, and the reaction continues for 1 hour. The temperature is lowered to 35°C, and a mixture of 7 parts Poly-EPS, 5 parts imidazoline quaternary ammonium salt, 0.4 parts sodium hydroxide, and 125 parts water is added for neutralization and emulsification for 30 minutes. Then, 20 parts of a 1% potassium persulfate aqueous solution are added dropwise over 30 minutes at 70°C, and the mixture is kept at this temperature for 2 hours to obtain the WPUA composite emulsion.

[0056] Step two involves the preparation of the multifunctional foaming agent. Specifically, 40 parts of cocamidopropyl dimethyl tertiary amine, 22 parts of sodium chloroacetate, 2.5 parts of polyaspartic acid, 4.5 parts of ethylene glycol, and 120 parts of a WPUA composite emulsion-isopropanol mixture (volume ratio 3:1) are added to a three-necked flask. The mixture is reacted at 75°C for 4 hours, with the pH adjusted to 8.5 every 30 minutes using a 10% NaOH aqueous solution. After cooling, the mixture is discharged to obtain the foaming agent of Example 1 of this disclosure.

[0057] The following describes Embodiment 2 of this disclosure:

[0058] Step one is the same as the process of preparing WPUA composite emulsion in Example 1, and will not be repeated here.

[0059] Step two involves the preparation of the multifunctional foaming agent. Specifically, 30 parts of laurylamide propyl dimethyl tertiary amine, 20 parts of sodium chloroacetate, 2 parts of polyepoxysuccinic acid, 3 parts of propylene glycol, and 120 parts of a WPUA-isopropanol mixture (volume ratio 3:1) are added to a three-necked flask. The mixture is reacted at 70°C for 3 hours, with the pH adjusted to 8 every 20 minutes. After cooling, the mixture is discharged to obtain the foaming agent of Example 2 of this disclosure.

[0060] The following describes Embodiment 3 of this disclosure:

[0061] Step one is the same as the process of preparing WPUA composite emulsion in Example 1, and will not be repeated here.

[0062] Step two involves the preparation of the multifunctional foaming agent. Specifically, 50 parts of a mixture of palm kernel oleamidopropyl dimethyl tertiary amine and oleamide propyl dimethyl tertiary amine (mass ratio 1:1), 25 parts of sodium chloroacetate, 3 parts of a mixture of polyaspartic acid and γ-glutamic acid (mass ratio 2:1), 6 parts of polyethylene glycol (PEG-400), and 120 parts of a WPUA-isopropanol mixture (volume ratio 3:1) are added to a three-necked flask. The mixture is reacted at 85°C for 5 hours, with the pH adjusted to 9 every 30 minutes using a 10% NaOH aqueous solution. The mixture is then cooled and discharged to obtain the foaming agent of Example 3 of this disclosure.

[0063] The following describes Embodiment 4 of this disclosure:

[0064] Step one is the same as the process of preparing WPUA composite emulsion in Example 1, and will not be repeated here.

[0065] Step two involves the preparation of the multifunctional foaming agent. Specifically, 45 parts of a mixture of cocamidopropyl dimethyl tertiary amine and oleamide-propyl dimethyl tertiary amine (mass ratio 3:2), 23 parts of sodium chloroacetate, 2.8 parts of a mixture of polyepoxysuccinic acid and γ-glutamic acid (mass ratio 1:1), 5 parts of a mixture of glycerol and ethylene glycol (mass ratio 2:3), and 120 parts of a WPUA-isopropanol mixture (volume ratio 3:1) are added to a three-necked flask. The mixture is reacted at 80°C for 4.5 hours, with the pH adjusted to 8.5 every 30 minutes using a 10% NaOH aqueous solution. The mixture is then cooled and discharged to obtain the foaming agent of Example 4 of this disclosure.

[0066] The following is an explanation of Comparative Example 1:

[0067] In step one, 10 parts IPDI, 10 parts NCL, 3 parts CO, 3 parts DMBA, 0.05 parts DBTDL, and 15 parts MMA were added to a dry three-necked flask and reacted at 75°C for 3 hours. Then, 1 part HEA was added and the reaction continued for another hour. The temperature was lowered to 35°C, and a mixture of 7 parts Poly-EPS, 0.4 parts NaOH, and 125 parts water was added to neutralize and emulsify for 30 minutes. Then, 20 parts of 1% potassium persulfate aqueous solution were added dropwise at 70°C (completed over 30 minutes), and the mixture was kept at this temperature for 2 hours to obtain the WPUA composite emulsion.

[0068] In step two, 45 parts of a mixture of cocamidopropyl dimethyl tertiary amine and oleamidopropyl dimethyl tertiary amine (mass ratio 3:2), 23 parts of sodium chloroacetate, 2.8 parts of a mixture of polyepoxysuccinic acid and γ-glutamic acid (mass ratio 1:1), 5 parts of a mixture of glycerol and ethylene glycol (mass ratio 2:3), and 120 parts of a WPUA-isopropanol mixture (volume ratio 3:1) were added to a three-necked flask. The mixture was reacted at 80°C for 4.5 hours, with the pH adjusted to 8.5 every 30 minutes using a 10% NaOH aqueous solution. The mixture was then cooled and discharged to obtain the foaming agent of Comparative Example 1.

[0069] The following explains Comparative Example 2:

[0070] Add 5 parts of imidazoline quaternary ammonium salt, 45 parts of a mixture of cocamidopropyl dimethyl tertiary amine and oleamidopropyl dimethyl tertiary amine (mass ratio 3:2), 23 parts of sodium chloroacetate, 2.8 parts of a mixture of polyepoxysuccinic acid and γ-glutamic acid (mass ratio 1:1), 5 parts of a mixture of glycerol and ethylene glycol (mass ratio 2:3), and 120 parts of a deionized water-isopropanol mixture (volume ratio 3:1) to a three-necked flask. React at 80℃ for 4.5 h, adjusting the pH to 8.5 with 10% NaOH aqueous solution every 30 min during the reaction. Cool and discharge to obtain the foaming agent of Comparative Example 2.

[0071] The following explains Comparative Example 3:

[0072] Add 45 parts of a mixture of cocamidopropyl dimethyl tertiary amine and oleamidopropyl dimethyl tertiary amine (mass ratio 3:2), 23 parts of sodium chloroacetate, 5 parts of a mixture of glycerol and ethylene glycol (mass ratio 2:3), and 120 parts of a deionized water-isopropanol mixture (volume ratio 3:1) to a three-necked flask. React at 80°C for 4.5 h, adjusting the pH to 8.5 with 10% NaOH aqueous solution every 30 min during the reaction. Cool and discharge to obtain the foaming agent of Comparative Example 3.

[0073] For testing purposes, this disclosure describes the preparation of simulated mineralized water. Specifically, it is prepared using reagents NaCl, KCl, anhydrous CaCl2, and MgCl2, with a total mineralization of 80,000 mg / L. The dosage of reagents added per liter of simulated mineralized water is shown in Table 1.

[0074] Table 1

[0075]

[0076] The performance of the foaming agents prepared in the above embodiments and comparative examples was tested, and the specific test results are shown in Table 2:

[0077] Table 2

[0078]

[0079] For the corrosion inhibition rate test, firstly, a 0.4% solution of the examples and comparative examples was prepared using simulated mineralized water with a mineralization of 80,000 mg / L. Next, the N80 carbon steel sheets were cleaned, dried, and weighed (accurate to 0.1 mg). Then, the treated N80 carbon steel sheets were immersed in mineralized water and the mineralized water containing the examples and comparative examples at 80°C for 7 days. Finally, the tested N80 carbon steel sheets were removed, corrosion products were removed, cleaned, dried, and weighed again.

[0080] Specifically, the corrosion inhibition efficiency can be calculated using the quality difference, as shown in Formula 1:

[0081] (Formula 1)

[0082] Where V0 is the corrosion rate without corrosion inhibitor (such as metal weight loss rate, corrosion current density, etc.), V i The corrosion rate is the rate after adding the corrosion inhibitor.

[0083] For the calculation of the corrosion rate V, please refer to Formula 2:

[0084] (Formula 2)

[0085] Where m0 is the initial mass of the sample (g), m t ρ is the mass (g) of the sample after corrosion time t, A is the surface area (cm²) of the sample, t is the corrosion time (h), and ρ is the metal density (g / cm³).

[0086] For the scale inhibition efficiency test, 0.4% of the example and comparative solutions can be prepared as scale inhibitors, and the amount of evaluation solution added is 20 mL. The scale inhibition efficiency is tested according to the method in Appendix A3.3 of the standard Q / SY17126-2019.

[0087] The stability, corrosion inhibition efficiency, and scale inhibition rate of the foaming agents prepared in Comparative Examples 1-3 and Examples 1-4 were tested, and Example 4 showed the best overall performance. Regarding stability, Comparative Example 2, because it used deionized water instead of the WPUA composite emulsion, lacked the "bridging effect" of latex particles, resulting in poor stratification stability. Regarding corrosion inhibition efficiency, in Example 4, the rapid formation of the initial film by the quaternary ammonium cations in the imidazoline synergistically formed a network cross-linked structure with the polymer chains in the WPUA, resulting in the best corrosion inhibition efficiency for N80 carbon steel sheets in the foaming agent solution of Example 4. Regarding scale inhibition efficiency, the comparative examples and examples introducing scale inhibitors and imidazoline all showed scale inhibition rates greater than 40% for CaSO4, CaCO3, and BaSO4.

[0088] Figure 3 The image shown is a SEM image of an N80 carbon steel sheet after being immersed in the foaming agent solution prepared in Example 4 of this disclosure for 168 hours. Figure 4 The image shown is a SEM image of an N80 carbon steel sheet after being immersed in the foaming agent solution prepared in Comparative Example 3 of this disclosure for 168 hours.

[0089] refer to Figure 3 and Figure 4 It can be seen that after soaking in the foaming agent solution of Example 4 for 168 hours, the surface of the N80 carbon steel sheet is relatively smoother and the corrosion marks are shallower. In the solution of Comparative Example 3, the surface corrosion grooves are deep and the damage is obvious, indicating that the foaming agent of Example 4 has a better protective effect on the N80 carbon steel sheet and is conducive to improving the stability of the material in an environment containing this foaming agent.

[0090] For liquid carrying capacity testing, the liquid carrying capacity of the foaming agent can be evaluated indoors according to standard SY / T6465—2000. A Roche foam apparatus can be used for liquid carrying capacity analysis at a gas flow rate of 200 L / min. Prepare a 0.4% solution of the test sample using simulated mineralized water with a mineralization of 80000 mg / L, and take 200 mL. Place the solution in the foaming tube of the Roche foam apparatus, and introduce air from the bottom of the foaming tube. Measure the total volume of liquid flowing out from the top of the foaming tube after 15 minutes of testing at a temperature of 80℃. The liquid carrying capacity test results are as follows: Figure 5 As shown.

[0091] Take 180 mL of simulated mineralized water with a mineralization of 80000 mg / L and 20 mL of petroleum ether, then add 0.8 mL of the test sample and mix thoroughly. Place the solution in the foaming tube of a Roche foam apparatus, and introduce air from the bottom of the foaming tube. Measure the total volume of liquid flowing out from the top of the foaming tube after 15 minutes at a test temperature of 80℃. The liquid carrying capacity test results are as follows: Figure 6 As shown.

[0092] Formula 3 provides the method for calculating the liquid carrying capacity:

[0093] (Formula 3)

[0094] refer to Figure 5 The carbon chain length of the amide tertiary amine in the synthetic foaming agent has a significant impact on the liquid carrying capacity, perfectly aligning with the industry consensus that "short carbon chains promote foaming, while long carbon chains strongly stabilize foam." From Figure 6 (Including 10% condensate oil) It can be observed that the liquid carrying capacity of Examples 3 and 4 and Comparative Examples 1-3 is significantly higher than that of Examples 1 and 2. This is mainly because the foaming agent molecules in Examples 3 and 4 and Comparative Examples 1-3 contain both short carbon chains that are beneficial for foaming and long carbon chains with strong hydrophobicity. The hydrophobicity of the long carbon chains promotes the directional arrangement of the main agent molecules at the oil-water interface, forming a dense molecular film, with the hydrophobic long carbon chain segments facing the oil phase. This molecular film can effectively reduce the surface tension at the oil-water interface, significantly improve the stability of the oil-water system, and thus reduce the damage of condensate oil to the foam structure, ultimately exhibiting a higher liquid carrying capacity.

[0095] For foam performance testing, refer to SY / T6465-2000 "Evaluation Method of Foaming Agent for Foam Drainage and Gas Production". Use simulated mineralized water with a mineralization of 80000 mg / L to prepare a 0.4% solution of Example 4 and Comparative Example 3 to test the foaming performance.

[0096] See Figure 7 The results show that the initial foam heights of Example 4 and Comparative Example 3 are not significantly different, but as time goes on, the foam height of Comparative Example 3 decreases more rapidly, indicating that Comparative Example 3 has poor foam stability.

[0097] It should be noted that although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0098] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this disclosure and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0099] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0100] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for preparing a foaming agent with anti-corrosion and scale-inhibiting functions in oil and gas extraction, characterized in that, include: Isophorone diisocyanate, polycaprolactone diol, castor oil, 2,2-dimethylolbutyric acid, dibutyltin dilaurate and methyl methacrylate are mixed and subjected to the first reaction process to obtain the first mixture; Hydroxyethyl acrylate is added to the first mixture to perform a second reaction process, thereby obtaining a second mixture; A predetermined solution is added to the second mixture to perform a third reaction process to obtain a third mixture; wherein the predetermined solution consists of sodium aminosulfonate water-soluble chain extender, imidazoline quaternary ammonium salt, sodium hydroxide and water; A potassium persulfate aqueous solution was added dropwise to the third mixture to obtain a polyurethane acrylate composite emulsion; wherein, an imidazoline quaternary ammonium salt was introduced into the chain segment structure of the polyurethane acrylate via free radical polymerization. The polyurethane acrylate composite emulsion was mixed with isopropanol to obtain a fourth mixture; The fourth mixture, amide-based tertiary amine, sodium chloroacetate, scale inhibitor, and pour point regulator are mixed and the fourth reaction process is carried out to obtain an oil and gas foaming agent; wherein, the amide-based tertiary amine is one or a mixture of cocamidopropyl dimethyl tertiary amine, lauryl amide-based dimethyl tertiary amine, palm kernel oleamide-based dimethyl tertiary amine, and oleamide-based dimethyl tertiary amine.

2. The preparation method according to claim 1, characterized in that, Isophorone diisocyanate, polycaprolactone diol, castor oil, 2,2-dimethylolbutyric acid, dibutyltin dilaurate, and methyl methacrylate are mixed and subjected to a first reaction process to obtain a first mixture comprising: By weight, 10 parts of isophorone diisocyanate, 10 parts of polycaprolactone diol, 3 parts of castor oil, 3 parts of 2,2-dimethylolbutyric acid, 0.05 parts of dibutyltin dilaurate and 15 parts of methyl methacrylate were mixed and reacted at 75°C for 3 hours to obtain the first mixture.

3. The preparation method according to claim 2, characterized in that, Hydroxyethyl acrylate is added to the first mixture to perform a second reaction process, thereby obtaining a second mixture comprising: One part by weight of hydroxyethyl acrylate was added to the first mixture, and the mixture was reacted at 75°C for 1 hour and then cooled to 35°C to obtain the second mixture.

4. The preparation method according to claim 1, characterized in that, The preparation method further includes: By weight, 7 parts of sodium aminosulfonate water-soluble chain extender, 5 parts of imidazoline quaternary ammonium salt, 0.4 parts of sodium hydroxide and 125 parts of water are mixed to obtain the predetermined solution.

5. The preparation method according to claim 1, characterized in that, Adding an aqueous solution of potassium persulfate dropwise to the third mixture yields a polyurethane acrylate composite emulsion, comprising: The reaction temperature was controlled at 70°C, and 20 parts by weight of a 1% potassium persulfate aqueous solution were added dropwise to the third mixture over a period of 30 minutes. After the addition is complete, keep warm for 2 hours to obtain a polyurethane acrylate composite emulsion.

6. The preparation method according to claim 1, characterized in that, The polyurethane acrylate composite emulsion is mixed with isopropanol to obtain a fourth mixture, comprising: The polyurethane acrylate composite emulsion was mixed with isopropanol at a volume ratio of 3:1 to obtain a fourth mixture.

7. The preparation method according to claim 1, characterized in that, The fourth mixture, amide-based tertiary amine, sodium chloroacetate, scale inhibitor, and pour point regulator are mixed, and the fourth reaction process is performed to obtain an oil and gas development foaming agent, comprising: By weight, 120 parts of the fourth mixture, 30-50 parts of amide-based tertiary amine, 20-25 parts of sodium chloroacetate, 2-3 parts of scale inhibitor and 3-6 parts of pour point regulator are mixed, heated to dissolve, reacted at 70-85°C for 3-5 hours, and the pH is adjusted to 8-9 using sodium hydroxide solution. After cooling to room temperature, an oil and gas foaming agent is obtained.

8. The preparation method according to claim 7, characterized in that, Adjusting the pH to 8-9 using sodium hydroxide solution includes: Adjust the pH to 8-9 every 20-30 minutes using a 10% sodium hydroxide solution.

9. The preparation method according to claim 1 or 7, characterized in that, The scale inhibitor is one or a mixture of polyaspartic acid, polyepoxysuccinic acid, and γ-glutamic acid; and / or The pour point regulator is one or a mixture of ethylene glycol, propylene glycol, polyethylene glycol, and glycerol.

10. A foaming agent for oil and gas extraction with anti-corrosion and scale inhibition functions, characterized in that, The oil and gas slurry with anti-corrosion and scale inhibition function as described in any one of claims 1 to 9 is prepared using the foaming agent preparation method.

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