Selection method and system of surfactant compounding system and storage medium

Abstract

The embodiment of the invention provides a selection method and system of a surfactant compounding system and a storage medium, and belongs to the technical field of preparation of surfactants. The method comprises the following steps: acquiring first parameters of a compound system, wherein the first parameters comprise critical micelle concentration and saturated adsorption concentration; based on the first parameter of the compound system, determining a second parameter of the compound system, the second parameter including an interaction parameter between molecules of a mixed micelle layer and an interaction parameter between molecules of a mixed adsorption layer; and based on the first parameter and the second parameter of the compound system, selecting a target compound system from the plurality of compound systems. Through the selection method of the surfactant compound system provided by the embodiment of the invention, the surfactant compound system with a synergistic effect, ultralow interfacial tension and excellent temperature resistance can be quickly screened out.

Description

Technical Field

[0001] This disclosure relates to the field of surfactant preparation technology, and specifically to a method, system and storage medium for selecting surfactant complex systems. Background Technology

[0002] Building upon conventional primary and secondary oil recovery, tertiary oil recovery, as an enhanced oil recovery (EOR) method, can significantly improve crude oil recovery rates. Chemical enhanced oil recovery (cEOR) has advantages such as low cost, high efficiency, and ease of implementation, with surfactant flooding being particularly widely used.

[0003] With the continuous development of oilfields, the research and development of new oil displacement systems has become a hot topic. To develop efficient surfactant systems for oil displacement, two approaches are being taken: synthesizing novel surfactants and compounding surfactants. However, surfactant synthesis faces challenges such as long production cycles, operational difficulties, and high costs; therefore, surfactant compounding has become the preferred research method.

[0004] However, existing methods for screening surfactant formulations still have limitations and cannot quickly screen surfactant formulations with synergistic effects, ultra-low interfacial tension, and excellent temperature resistance. Summary of the Invention

[0005] The purpose of this disclosure is to provide a method, apparatus, device, and storage medium for rapidly screening surfactant formulations with synergistic effects, ultra-low interfacial tension, and excellent temperature resistance.

[0006] To achieve the above objectives, in a first aspect, embodiments of this disclosure provide a method for selecting a surfactant complex system, the method comprising: obtaining a first parameter of the complex system, the first parameter including a critical micelle concentration and a saturated adsorption concentration; determining a second parameter of the complex system based on the first parameter of the complex system, the second parameter including interaction parameters between molecules in the mixed micelle layer and interaction parameters between molecules in the mixed adsorption layer; and selecting a target complex system from multiple complex systems based on the first parameter and the second parameter of the complex system.

[0007] In some embodiments, determining a second parameter of the complex system based on a first parameter of the complex system includes: determining the mole fraction in the mixed micelle layer of the complex system based on the critical micelle concentration of the complex system; and determining the interaction parameters between molecules in the mixed micelle layer of the complex system based on the critical micelle concentration of the complex system and the mole fraction in the mixed micelle layer of the complex system.

[0008] In some embodiments, the mole fraction in the mixed micelle layer of the compound system is determined according to the following formula: ,in, The mole fraction in the mixed micelle layer, α 1. The molar content of each component in each compound system The critical micelle concentration for each compound system, and These represent the component concentrations corresponding to the critical micelle concentration of each compound system.

[0009] In some embodiments, the interaction parameters between molecules in the mixed micelle layer of the compound system are determined according to the following formula: ,in, For the interaction parameters between molecules in the mixed micelle layer, α 1. The molar content of each component in each compound system x 1 m The mole fraction in the mixed micelle layer, The critical micelle concentration for each compound system, and These represent the component concentrations corresponding to the critical micelle concentration of each compound system.

[0010] In some embodiments, determining a second parameter of the complex system based on a first parameter of the complex system includes: determining the mole fraction in the mixed adsorption layer of the complex system based on the saturated adsorption concentration of the complex system; and determining the interaction parameters between molecules in the mixed adsorption layer of the complex system based on the saturated adsorption concentration of the complex system and the mole fraction in the mixed adsorption layer of the complex system.

[0011] In some embodiments, the mole fraction in the mixed adsorption layer of the composite system is determined according to the following formula: ,in, The mole fraction in the mixed adsorption layer, α 1. The molar content of each component in each compound system The saturated adsorption concentration for each compound system, and These represent the component concentrations corresponding to the saturated adsorption concentrations of each compound system.

[0012] In some embodiments, the interaction parameters between molecules in the mixed adsorption layer of the composite system are determined according to the following formula: ,in, For the interaction parameters between molecules in the mixed adsorption layer, α 1. The molar content of each component in each compound system The mole fraction in the mixed adsorption layer, The saturated adsorption concentration for each compound system, and These represent the component concentrations corresponding to the saturated adsorption concentrations of each compound system.

[0013] In some embodiments, determining a target compound system from multiple compound systems based on a first parameter and a second parameter of the compound system includes: determining a first compound system interval that satisfies the synergistic effect condition from multiple compound systems based on the second parameter of the compound system; determining the saturated adsorption capacity of the compound system based on the first parameter of the compound system; determining a second compound system interval from the first compound system interval based on the first parameter and the saturated adsorption capacity of the compound system; determining the interfacial tension of each compound system in the second compound system interval, and selecting the compound system with the lowest interfacial tension value as the target compound system when the interfacial tension of at least one compound system reaches an ultra-low interfacial tension; wherein the synergistic effect condition includes: the interaction parameter between molecules in the mixed adsorption layer is negative, the difference between the interaction parameter between molecules in the mixed adsorption layer and the interaction parameter between molecules in the mixed micelle layer is negative, and the absolute value of the difference between the interaction parameter between molecules in the mixed adsorption layer and the interaction parameter between molecules in the mixed micelle layer is greater than the absolute value of the logarithm of the ratio between the ratio of the saturated adsorption concentration of each component and the ratio of the micelle concentration of each component.

[0014] In some embodiments, the saturated adsorption capacity of the compound system is determined according to the following formula: ,in, Saturated adsorption capacity n molar quantity γ Critical micelle concentration, c For surfactant concentration, T For temperature.

[0015] In some embodiments, the components of the compound system include anionic surfactants and amphoteric surfactants; multiple compound systems include multiple compound systems with multiple compounding ratios, wherein the compounding ratio is the molar ratio of anionic surfactants to amphoteric surfactants.

[0016] Secondly, embodiments of this disclosure provide a selection system for surfactant complex systems. The selection system includes: a memory for storing parameter information of multiple complex systems; and a processor configured to perform the following operations: acquiring a first parameter of the complex system, the first parameter including a critical micelle concentration and a saturated adsorption concentration; determining a second parameter of the complex system based on the first parameter, the second parameter including interaction parameters between molecules in the mixed micelle layer and interaction parameters between molecules in the mixed adsorption layer; and determining a target complex system from the multiple complex systems based on the first and second parameters of the complex system.

[0017] Thirdly, embodiments of this disclosure provide a machine-readable storage medium storing instructions that cause a machine to perform the method for selecting a surfactant compound system provided in the first aspect or any embodiment of the first aspect.

[0018] Through the above technical solutions, the method for selecting surfactant compound systems provided in this disclosure can quickly screen surfactant compound systems with synergistic effects, ultra-low interfacial tension, and excellent temperature resistance.

[0019] Other features and advantages of the embodiments disclosed herein will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the following detailed description to explain the embodiments of this disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart provided in Example 1 of the method for selecting surfactant compound systems according to this disclosure; Figure 2 The surface tension γ of the compound system under different proportions according to Embodiment 1 of this disclosure is related to the logarithm lg of the concentration. c Data chart; Figure 3 This is a flowchart provided in Example 2 of the method for selecting surfactant compound systems according to this disclosure; Figure 4 This is a flowchart provided in Example 3 of the method for selecting surfactant compound systems according to this disclosure; Figure 5 This is a flowchart provided in Example 4 of the method for selecting surfactant compound systems according to this disclosure; Figure 6 This is a schematic diagram of the interfacial tension versus time in the 5 / 2 compound system provided in Embodiment 4 of this disclosure; Figure 7This is a schematic diagram of the interfacial tension versus time in the 6 / 5 compound system provided in Embodiment 4 of this disclosure; Figure 8 This is a schematic diagram showing the water separation rate of the emulsion in the compound system at different temperatures. Detailed Implementation

[0021] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this disclosure.

[0022] In surfactant complex systems, the complex solution typically exhibits superior performance compared to a single surfactant system. This is because the surfactants in the complex solution interact with each other; this interaction is known as the synergistic effect. The synergistic effect contributes to the superior performance of the complex system; therefore, investigating the synergistic effect between surfactants is of significant guiding importance for screening high-performance complex systems.

[0023] Sodium sulfonate, anionic surfactants, are inexpensive and possess good interfacial properties, making them one of the most widely used surfactants in tertiary oil recovery. However, sodium sulfonate has low efficiency in reducing interfacial tension and poor performance with different salinity levels and crude oils. Blending sodium sulfonate with other types of surfactants can solve these problems. Amphoteric surfactants are frequently used in blends, resulting in surfactant systems with excellent interfacial properties and a wide range of applications. Betaine is the most commonly used amphoteric surfactant in tertiary oil recovery. Blending sodium sulfonate with straight-chain alkyl betaine can compensate for the low efficiency of sodium sulfonate in reducing interfacial tension, expand the application range of sodium sulfonate, and obtain blended systems with excellent interfacial properties.

[0024] To address the shortcomings of existing methods for screening and preparing surfactant complex systems, this disclosure provides a novel method for efficiently screening surfactant complex systems based on surface activity parameters. A surfactant complex system with ultra-low interfacial tension has been developed, and the surfactant complex system emulsion exhibits excellent temperature resistance.

[0025] Based on this, in a first aspect, embodiments of this disclosure provide a method for selecting a surfactant compound system, referring to... Figure 1 As shown, Figure 1 This is a schematic flowchart provided in Example 1 of the method for selecting surfactant compound systems according to this disclosure.

[0026] like Figure 1 As shown, the method for selecting the surfactant compound system includes steps S101 to S103: Step S101: Obtain the first parameter of the compound system.

[0027] The first parameter includes the critical micelle concentration (CMC) and the saturation adsorption concentration. The CMC refers to the minimum concentration at which surfactant molecules begin to spontaneously form micelles under specific conditions. At this point, the surface tension of the solution reaches its minimum and no longer decreases with increasing concentration, indicating that micelle formation has a significant impact on the solution properties. The saturation adsorption concentration, on the other hand, describes the state where surfactant molecules reach maximum adsorption at the gas-liquid interface. At this point, the interface is completely covered, and further increases in concentration do not change the adsorption amount.

[0028] Obtaining the critical micelle concentration (CMC) and saturation adsorption concentration of surfactants is crucial for screening compound systems, as they directly affect the behavior and interactions of surfactants in solution. A high CMC reflects the surfactant's ability to form micelles, while the saturation adsorption concentration relates to the surfactant's adsorption capacity at the interface, affecting its surface tension reduction performance.

[0029] In some embodiments, the critical micelle concentration can be obtained by surface tension testing.

[0030] For example, the steps for measuring surface tension are as follows: S11: Preheat the surface tension meter for 10 minutes; S12: Rinse the platinum plate with deionized water and dry it with an alcohol lamp; S13: Add the prepared compound system to the petri dish, place the platinum plate in place, wait 2 minutes for the platinum plate to cool, and then start the measurement; S14: Measure the surface tension of the compound system in step S13. Measure the compound system of each concentration three times and take the average value.

[0031] In step S13, the surface tension of the deionized water must be tested in advance to see if it meets the standard. If the error range is greater than 0.1 mN / m, the standard weights should be used for recalibration.

[0032] In step S14, step S12 must be repeated after each concentration of the compound system has been tested.

[0033] The measured surface tension value can be used as the ordinate and the concentration as the abscissa to plot a surface tension-concentration curve. On the surface tension-concentration curve, the point where the surface tension no longer decreases significantly is found. The concentration corresponding to this inflection point is the CMC.

[0034] In some embodiments, surfactants can be continuously added to compound systems with different compounding ratios, and the surfactant concentration corresponding to a 20 mN / m decrease in surface tension of the compound system after addition can be recorded as the saturated adsorption concentration of the compound system.

[0035] By accurately measuring these parameters, surfactant formulations can be effectively screened and optimized to achieve the desired application results.

[0036] Step S102: Determine the second parameter of the compound system based on the first parameter of the compound system.

[0037] The second parameter includes the interaction parameters between molecules in the mixed micelle layer and the interaction parameters between molecules in the mixed adsorption layer.

[0038] The interaction parameters between molecules in the mixed micelle layer reflect the strength of the interaction between different surfactant molecules within the micelles. The interaction parameters between molecules in the mixed adsorption layer describe the interaction between different surfactant molecules at the gas-liquid interface.

[0039] By determining these parameters, the synergistic effect between surfactant molecules can be effectively analyzed.

[0040] Step S103: Select the target compound system from multiple compound systems based on the first and second parameters of the compound system.

[0041] In some embodiments, the components of the compound system include anionic surfactants and amphoteric surfactants; multiple compound systems include multiple compound systems with multiple compounding ratios, where the compounding ratio is the molar ratio of anionic surfactants to amphoteric surfactants. It should be noted that the components of the compound system can be adaptively selected depending on the target compound system; the components in the embodiments of this disclosure are merely examples and not intended to further limit this disclosure.

[0042] For example, the main components of the compound system provided in this disclosure are a sodium sulfonate salt and a straight-chain alkyl betaine. The specific steps of the method for selecting the above-mentioned surfactant compound system are as follows.

[0043] S21: Take 1 g of sodium heavy alkylbenzene sulfonate (HABS) and 1 g of dodecyl dimethyl betaine (BS-12) to prepare 100 mL of surfactant stock solutions. Dilute a certain amount of the stock solutions to prepare mixed solutions with a total concentration of 0.01 mol / L according to the molar ratios of BS-12 / HABS: 1 / 9, 3 / 7, 5 / 5, 7 / 3, and 9 / 1, respectively. To ensure thorough mixing of the compound solutions, stir the solutions at room temperature, 800 r / min, for 2 h.

[0044] For example, first weigh out 0.0009 mol, 0.0007 mol, 0.0005 mol, 0.0003 mol, and 0.0001 mol of dodecyl dimethyl betaine, and prepare 50 mL solutions. Then weigh out 0.0009 mol, 0.0007 mol, 0.0005 mol, 0.0003 mol, and 0.0001 mol of sodium heavy alkylbenzene sulfonate, and prepare 50 mL solutions. Finally, mix sodium heavy alkylbenzene sulfonate and dodecyl dimethyl betaine in a molar ratio of 9 / 1, 7 / 3, 5 / 5, 3 / 7, and 1 / 9 to obtain a mixed solution with a total concentration of 0.01 mol / L.

[0045] It should be noted that turbidity measurement should be performed after thorough mixing of the compound system. If the turbidity change does not exceed 1 FTU (Formazin Turbidity Unit) within 1 hour, the compound system is considered well mixed. A turbidity change of no more than 1 FTU within 1 hour indicates that the turbidity of the solution changes very little during this period, suggesting good solution stability and minimal change in the concentration of suspended particulate matter.

[0046] S22: Dilute the obtained mixed solutions with different formulation ratios and perform surface tension tests to obtain the critical micelle concentration (CMC). Record the surface tension values ​​at each concentration. The concentration corresponding to the inflection point of the logarithm (lgc) of surface tension γ and concentration is the critical micelle concentration (CMC). The CMC of the mixed system is determined using... It indicates that dodecyl dimethyl betaine is used It indicates that sodium heavy alkylbenzene sulfonate is used express.

[0047] S23: Continuously add BS-12 or HABS to compound systems with different mixing ratios and record the saturated adsorption concentration c corresponding to a 20 mN / m decrease in surface tension of the compound system after addition. 20 The surfactant concentration c corresponding to a 20 mN / m decrease in the mixed system. 20 This indicates that a 20 mN / m reduction in surfactant concentration corresponds to the use of dodecyl dimethyl betaine. This indicates that sodium heavy alkylbenzene sulfonate reduces the surfactant concentration by 20 mN / m using... express.

[0048] S24: Plot the surface tension and concentration values ​​from steps S22 and S23 onto a single canvas to obtain... Figure 2 The surface tension shown is related to the logarithm of concentration (lg). c The data graph also records the concentration c corresponding to a 20 mN / m decrease in surfactant. 20Plot the curve of surface tension γ versus the logarithm of concentration lgc as follows: Figure 2 As shown. Reference Figure 2 The critical micelle concentration and saturated adsorption concentration of the compound solutions with different compounding ratios were determined, as shown in Table 1.

[0049] Table 1 First Parameter

[0050] In Table 1, α1 represents the molar content of dodecyl dimethyl betaine. The data in the table show the CMC and c of the compound system. 20 The values ​​are all lower than those of the single system, indicating that the compound system is more likely to have good synergistic effects and exhibit ultra-low interfacial tension.

[0051] S25: Calculate the second parameter based on the first parameter obtained in step S24, that is, calculate the interaction parameter β between dodecyl dimethyl betaine and sodium heavy alkylbenzene sulfonate. σ β m As shown in Table 2.

[0052] Table 2 Second Parameter

[0053] The condition for achieving a synergistic effect in reducing surface tension efficiency is as follows: The conditions for satisfying the synergistic effect of micelle formation ability are: The conditions for achieving the synergistic effect of reducing interfacial tension are: .

[0054] As shown by the parameters in Table 2, the compound systems of dodecyl dimethyl betaine and sodium heavy alkylbenzene sulfonate with the above-mentioned compound ratios all have a comprehensive synergistic effect. Further, combined with the parameters in Table 1, it can be seen that when the compound ratio is between 5 / 5 and 9 / 1, the CMC of the compound system is low and the saturated adsorption concentration is low (the calculated saturable adsorption capacity is large), that is, the surfactant in this range has a good comprehensive synergistic effect.

[0055] S26: Use the parameters in Tables 1 and 2 to determine a better range of compounding ratios. Within this range, a series of compounding systems with different compounding ratios can be prepared, the interfacial tension can be measured, and then the optimal compounding ratio of the system can be determined.

[0056] S27: The compound system prepared with the optimal compound ratio obtained in step S26 is thoroughly mixed with crude oil and shaken to obtain an emulsion. The water separation rate of the emulsion at different temperatures is recorded to verify that the emulsion prepared with the optimal compound ratio has excellent temperature resistance.

[0057] The method for selecting surfactant compound systems provided in this disclosure can quickly screen surfactant compound systems with synergistic effects, ultra-low interfacial tension, and excellent temperature resistance by using a first parameter and a second parameter.

[0058] In a first aspect, embodiments of this disclosure provide a method for selecting a surfactant compound system, with reference to Figure 3 As shown, Figure 3 This is a flowchart provided in Example 2 of the method for selecting surfactant compound systems according to the present disclosure.

[0059] In one feasible implementation, such as Figure 3 As shown, the second parameter of the complex system is determined based on the first parameter of the complex system, including steps S201 to S202.

[0060] Step S201: Determine the mole fraction in the mixed micelle layer of the compound system based on the critical micelle concentration of the compound system.

[0061] In some embodiments, the mole fraction in the mixed micelle layer of the compound system is determined according to the following formula: ,in, The mole fraction in the mixed micelle layer, α 1. The molar content of each component in each compound system The critical micelle concentration for each compound system, and These represent the component concentrations corresponding to the critical micelle concentration of each compound system.

[0062] Step S202: Based on the critical micelle concentration of the compound system and the mole fraction in the mixed micelle layer of the compound system, determine the interaction parameters between molecules in the mixed micelle layer of the compound system.

[0063] In some embodiments, the interaction parameters between molecules in the mixed micelle layer of the compound system are determined according to the following formula: ,in, For the interaction parameters between molecules in the mixed micelle layer, α 1. The molar content of each component in each compound system x 1 m The mole fraction in the mixed micelle layer, The critical micelle concentration for each compound system, and These represent the component concentrations corresponding to the critical micelle concentration of each compound system.

[0064] The method for selecting surfactant blending systems provided in this disclosure determines the molar fraction in the mixed micelle layer by measuring the critical micelle concentration (CMC) of the surfactant blending system, and then evaluates the interaction parameters between molecules in the mixed micelle layer, thereby enabling precise control and optimization of the surfactant blending system.

[0065] In a first aspect, embodiments of this disclosure provide a method for selecting a surfactant compound system, with reference to Figure 4 As shown, Figure 4 This is a flowchart provided in Example 3 of the method for selecting surfactant compound systems according to this disclosure.

[0066] In one feasible implementation, such as Figure 4 As shown, the second parameter of the complex system is determined based on the first parameter of the complex system, including steps S301 to S302.

[0067] Step S301: Determine the mole fraction in the mixed adsorption layer of the compound system based on the saturated adsorption concentration of the compound system.

[0068] In some embodiments, the mole fraction in the mixed adsorption layer of the composite system is determined according to the following formula: ,in, The mole fraction in the mixed adsorption layer, α 1. The molar content of each component in each compound system The saturated adsorption concentration for each compound system, and These represent the component concentrations corresponding to the saturated adsorption concentrations of each compound system.

[0069] Step S303: Based on the saturated adsorption concentration of the composite system and the mole fraction in the mixed adsorption layer of the composite system, determine the interaction parameters between molecules in the mixed adsorption layer of the composite system.

[0070] In some embodiments, the interaction parameters between molecules in the mixed adsorption layer of the composite system are determined according to the following formula: ,in, For the interaction parameters between molecules in the mixed adsorption layer, α 1. The molar content of each component in each compound system The mole fraction in the mixed adsorption layer, The saturated adsorption concentration for each compound system, and These represent the component concentrations corresponding to the saturated adsorption concentrations of each compound system.

[0071] The method for selecting surfactant blending systems provided in this disclosure determines the molar fraction in the mixed adsorption layer by measuring the saturated adsorption concentration of the surfactant blending system, and then evaluates the interaction parameters between molecules in the mixed adsorption layer, thereby enabling precise control and optimization of the surfactant blending system.

[0072] In a first aspect, embodiments of this disclosure provide a method for selecting a surfactant compound system, with reference to Figure 5 As shown, Figure 5 This is a schematic flowchart provided in Example 4 of the method for selecting surfactant compound systems according to this disclosure.

[0073] In one feasible implementation, such as Figure 5 As shown, the target compound system is determined from multiple compound systems based on the first and second parameters of the compound system, including steps S401 to S404.

[0074] Step S401: Based on the second parameter of the compound system, determine the first compound system interval that satisfies the synergistic effect condition from multiple compound systems.

[0075] The synergistic effect conditions include: the interaction parameters between molecules in the mixed adsorption layer are negative; the difference between the interaction parameters between molecules in the mixed adsorption layer and the interaction parameters between molecules in the mixed micelle layer is negative; and the absolute value of the difference between the interaction parameters between molecules in the mixed adsorption layer and the interaction parameters between molecules in the mixed micelle layer is greater than the absolute value of the logarithm of the ratio between the ratio of the saturated adsorption concentration of each component and the ratio of the micelle concentration of each component.

[0076] Based on the data obtained from Examples 2 and 3 above, we further calculated whether the compound system at different ratios satisfies the synergistic effect of reducing surface tension efficiency: Does it satisfy the synergistic effect of micelle formation ability? And whether the synergistic effect of reducing interfacial tension is satisfied: The summary data is shown in Table 3.

[0077] Table 3 Interaction parameters

[0078] As can be seen from the interaction parameters in Table 3, the compound systems of dodecyl dimethyl betaine and sodium heavy alkylbenzene sulfonate with the above-mentioned compound ratios all meet the conditions for a comprehensive synergistic effect and have a comprehensive synergistic effect.

[0079] Step S402: Determine the saturated adsorption capacity of the compound system based on the first parameter of the compound system.

[0080] In step S23 of the above Example 1, the negative logarithm of the concentration corresponding to a 20 mN / m decrease in the surfactant solution is taken as the parameter of adsorption efficiency and denoted as pc. 20 .

[0081] In some embodiments, the saturated adsorption capacity of the compound system is determined according to the following formula: ,in, For saturated adsorption capacity, n molar quantity γ Critical micelle concentration, c For surfactant concentration, T The value is denoted by temperature. The calculated saturation adsorption capacity data are shown in Table 4.

[0082] Table 4 Saturated Adsorption Capacity

[0083] In Table 4, α1 represents the molar content of dodecyl dimethyl betaine. The data in the table show the pc of the compound system. 20 The values ​​are all greater than those of the single system, indicating that the adsorption efficiency of the complex system is greater than that of the single system. The Γ value of the complex system is... max The values ​​are all greater than those of the single system, indicating that the saturated adsorption capacity at the gas-liquid interface of the composite system is greater than that of the single system.

[0084] Step S403: Based on the first parameter and saturated adsorption capacity of the compound system, determine the second compound system interval from the first compound system interval.

[0085] Using the parameters in Tables 1 and 4 of the above embodiments, it can be seen that when the compounding ratio is between 5 / 5 and 9 / 1, the CMC of the compound system is low and the saturated adsorption capacity is large, indicating that the overall synergistic effect of the surfactants in this range is good. Therefore, the determined second compounding system range can be 5 / 5 to 9 / 1.

[0086] Step S404: Determine the interfacial tension of each compound system in the second compound system interval. When the interfacial tension of at least one compound system reaches an ultra-low interfacial tension, select the compound system with the lowest interfacial tension value as the target compound system.

[0087] Specifically, step S403 yields a range of compounding ratios with good synergistic effects. Within this range, a series of compounding solutions with different ratios and concentrations are prepared, and the interfacial tension is measured to determine the optimal compounding ratio of the system. In other words, by utilizing existing data and parameters, unnecessary experiments can be reduced, the optimal compounding system can be quickly found, and research and development efficiency can be improved.

[0088] In this embodiment of the present disclosure, in the second compound system range, a compound solution with a specific gravity of sodium dodecyl dimethyl betaine equal to 6 / 5 or 5 / 2 of sodium alkylbenzene sulfonate can be prepared.

[0089] For example, the specific steps for measuring interfacial tension are as follows: S31: Set up the experimental setup and preheat the rotating drop interfacial tensiometer for 30 minutes; S32: Inject the prepared compound solution into the sample tube; S33: Take 1.5μL~2μL of oil sample and hang it on the sample tube wall, then place the sample tube properly; S34: Start the turntable and imaging system, allowing the turntable to begin rotating so that the oil droplet is suspended in the middle of the image acquisition system; S35: Calculate the surface tension of a liquid by measuring changes in the shape and size of the droplets.

[0090] In some embodiments, during the sample tube sealing process in S33, bubble generation should be avoided. If significant bubbles are generated, steps S32 and S33 should be repeated.

[0091] In some embodiments, in S34, when the turntable speed is adjusted to 3000 r / min, the position of the oil droplet is adjusted, and when the oil droplet is suspended, the speed is increased to 6000 r / min to measure the interfacial tension.

[0092] For example, the interfacial tension was tested using the spin drop method, with the rotation speed controlled at 6000 r / min and the temperature at 40 ℃. A 1.5–2 μL sample of crude oil was attached to the wall of a quartz glass sample tube. Then, using a long-needle syringe, surfactant solutions of different molar ratios were slowly injected into the quartz sample tube, ensuring no air bubbles were present during the injection process. After injection, the cap was tightened and the tube was placed in the interfacial tension meter. The rotation speed was gradually increased from 200 r / min to 6000 r / min. The test was conducted for 15–30 minutes until the values ​​stabilized, and the data were recorded.

[0093] Through the above experimental steps, the interfacial tensions of the compound systems with specific gravities of dodecyl dimethyl betaine and sodium alkylbenzene sulfonate equal to 6 / 5 and 5 / 2 were tested, and plotted as follows: Figure 6 and Figure 7 . refer to Figure 6 and Figure 7 It can be seen that when sodium heavy alkylbenzene sulfonate / dodecyl dimethyl betaine = 6 / 5, the compound system exhibits an ultra-low interfacial tension value of 0.0052~0.0057 mN / m.

[0094] This disclosure provides a method for selecting surfactant blending systems, wherein the surfactant blending system may include the following components: sodium sulfonate and linear alkyl betaine. This disclosure utilizes the platinum plate method to test surface activity parameters at different blending ratios, and further calculates the interaction parameters of the surfactants. These parameters satisfy the conditions for enhancing surfactant mixed micelle formation, reducing interfacial tension efficiency, and reducing surface tension effectiveness, demonstrating a comprehensive synergistic effect. The interfacial tension is tested using the spin-drop method; when the optimal blending ratio is reached, the blending system can achieve 10... -3 Ultra-low interfacial tension of mN / m.

[0095] In the first aspect, after determining the target compound system, in order to further verify that the target compound system has excellent temperature resistance, a temperature resistance test can also be performed on the target compound system.

[0096] For example, the specific steps for the temperature resistance test are as follows: S41: Prepare the solution according to the proportions corresponding to the target compound system determined in Example 4; S42: Take 7 mL of the prepared surfactant solution and place it in a 10 mL stoppered tube; S43: Take 3 mL of oil and place it in a stoppered tube; S44: Shake the plugged tube for 10 minutes to fully mix the oil and water to form an emulsion; S45: Record the initial volume of the emulsion after it has stabilized. V 0; S46: Place the emulsion in environments at room temperature, 40℃, 50℃, 60℃, 70℃, 80℃, and 90℃, and record the volume change ∆ of the emulsion every two hours. V Record for 12 hours. The water separation rate of the emulsion is obtained by comparing the volume change of the emulsion with its initial volume. The numerical values ​​and data records are plotted in Table 5. Figure 8 .

[0097] Table 5. Changes in water separation rate with temperature

[0098] From Table 5 and Figure 8 The water separation rate data shows that the emulsion exhibits excellent temperature resistance with 1-η>0 at 90 ℃.

[0099] In other words, it has been verified that the water-in-oil emulsion formed by the surfactant compound system selected in the embodiments of this disclosure has excellent temperature resistance.

[0100] The method for selecting surfactant complex systems proposed in this disclosure can identify a surfactant synergistic complex system with ultra-low interfacial tension and strong temperature resistance, which has important theoretical guiding significance for screening and designing efficient surfactant systems.

[0101] Based on this, in a second aspect, embodiments of this disclosure provide a selection system for surfactant complex systems. The selection system includes: a memory for storing parameter information of multiple complex systems; and a processor configured to perform the following operations: acquiring a first parameter of the complex system, the first parameter including critical micelle concentration and saturated adsorption concentration; determining a second parameter of the complex system based on the first parameter, the second parameter including interaction parameters between molecules in the mixed micelle layer and interaction parameters between molecules in the mixed adsorption layer; and determining a target complex system from the multiple complex systems based on the first and second parameters of the complex system.

[0102] The surfactant compound system selection system provided in this disclosure adopts the surfactant compound system selection method in the above embodiments, which can solve the technical problems mentioned in the background art.

[0103] The beneficial effects of the surfactant compound system selection system provided in this disclosure are the same as those of the surfactant compound system selection method provided in the above embodiments, and other technical features of the surfactant compound system selection system are the same as those of the surfactant compound system selection method disclosed herein, and will not be repeated here.

[0104] Based on this, in a third aspect, embodiments of this disclosure provide a machine-readable storage medium storing instructions that cause a machine to perform the method for selecting a surfactant compound system provided in the first aspect or any embodiment of the first aspect.

[0105] The beneficial effects of the machine-readable storage medium provided in this disclosure are the same as those of the surfactant compound system selection method provided in the above embodiments, and will not be repeated here.

[0106] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0108] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0109] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0110] It should be noted that although the terms "first," "second," etc., are used herein to describe different modules, steps, and data in the embodiments of this disclosure, these terms are only for distinguishing between different modules, steps, and data, and do not indicate a specific order or degree of importance. In fact, the terms "first," "second," etc., can be used interchangeably.

[0111] Although the operations are described in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the operations shown to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0112] The acquisition, transmission, storage, use, and processing of data in this embodiment comply with the relevant provisions of national laws and regulations.

[0113] It should be noted that in the embodiments disclosed herein, certain software, components, models, and other existing solutions in the industry may be mentioned. These should be considered as exemplary and are intended only to illustrate the feasibility of implementing the technical solutions disclosed herein. However, they do not mean that the applicant has used or necessarily used such solutions.

[0114] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0115] The above are merely embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of the claims of this disclosure.

Claims

1. A method for selecting a surfactant compound system, characterized in that, The method includes: Obtain the first parameter of the compound system, the first parameter including the critical micelle concentration and the saturated adsorption concentration; Based on the first parameter of the compound system, the second parameter of the compound system is determined. The second parameter includes the interaction parameters between molecules in the mixed micelle layer and the interaction parameters between molecules in the mixed adsorption layer. Based on the first and second parameters of the compound system, a target compound system is selected from multiple compound systems.

2. The selection method according to claim 1, characterized in that, Determining the second parameter of the compound system based on the first parameter of the compound system includes: Based on the critical micelle concentration of the compound system, the mole fraction in the mixed micelle layer of the compound system is determined; The interaction parameters between molecules in the mixed micelle layer of the compound system are determined based on the critical micelle concentration of the compound system and the mole fraction in the mixed micelle layer of the compound system.

3. The selection method according to claim 2, characterized in that, The mole fraction in the mixed micelle layer of the compound system is determined according to the following formula: ， in, The mole fraction in the mixed micelle layer, α 1. The molar content of each component in each compound system The critical micelle concentration for each compound system, and These represent the component concentrations corresponding to the critical micelle concentration of each compound system.

4. The selection method according to claim 2, characterized in that, The interaction parameters between molecules in the mixed micelle layer of the compound system are determined according to the following formula: ， in, For the interaction parameters between molecules in the mixed micelle layer, α 1. The molar content of each component in each compound system x 1 m The mole fraction in the mixed micelle layer, The critical micelle concentration for each compound system, and These represent the component concentrations corresponding to the critical micelle concentration of each compound system.

5. The selection method according to claim 1, characterized in that, Determining the second parameter of the compound system based on the first parameter of the compound system includes: Based on the saturated adsorption concentration of the compound system, the mole fraction in the mixed adsorption layer of the compound system is determined; Based on the saturated adsorption concentration of the compound system and the mole fraction in the mixed adsorption layer of the compound system, the interaction parameters between molecules in the mixed adsorption layer of the compound system are determined.

6. The selection method according to claim 5, characterized in that, The mole fraction in the mixed adsorption layer of the composite system is determined according to the following formula: ， in, The mole fraction in the mixed adsorption layer, α 1. The molar content of each component in each compound system The saturated adsorption concentration for each compound system, and These represent the component concentrations corresponding to the saturated adsorption concentrations of each compound system.

7. The selection method according to claim 5, characterized in that, The interaction parameters between molecules in the mixed adsorption layer of the composite system are determined according to the following formula: ， in, For the interaction parameters between molecules in the mixed adsorption layer, α 1. The molar content of each component in each compound system The mole fraction in the mixed adsorption layer, The saturated adsorption concentration for each compound system, and These represent the component concentrations corresponding to the saturated adsorption concentrations of each compound system.

8. The selection method according to claim 1, characterized in that, The step of determining the target compound system from multiple compound systems based on the first and second parameters of the compound system includes: Based on the second parameter of the compound system, a first compound system interval that satisfies the synergistic effect condition is determined from multiple compound systems; Based on the first parameter of the compound system, the saturated adsorption capacity of the compound system is determined; Based on the first parameter and saturated adsorption capacity of the compound system, a second compound system range is determined from the first compound system range; Determine the interfacial tension of each compound system in the second compound system range. When the interfacial tension of at least one compound system reaches an ultra-low interfacial tension, select the compound system with the lowest interfacial tension value as the target compound system. The synergistic effect conditions include: the interaction parameter between the molecules of the mixed adsorption layer is negative; the difference between the interaction parameter between the molecules of the mixed adsorption layer and the interaction parameter between the molecules of the mixed micelle layer is negative; and the absolute value of the difference between the interaction parameter between the molecules of the mixed adsorption layer and the interaction parameter between the molecules of the mixed micelle layer is greater than the absolute value of the logarithm of the ratio between the ratio of the saturated adsorption concentration of each component and the ratio of the micelle concentration of each component.

9. The selection method according to claim 8, characterized in that, The saturated adsorption capacity of the compound system is determined according to the following formula: ， in, Saturated adsorption capacity n molar quantity γ Critical micelle concentration, c For surfactant concentration, T For temperature.

10. The selection method according to any one of claims 1-9, characterized in that, The components of the compound system include anionic surfactants and amphoteric surfactants; multiple compound systems include multiple compound systems with multiple compounding ratios, wherein the compounding ratio is the molar ratio of anionic surfactants to amphoteric surfactants.

11. A selection system for surfactant complex systems, characterized in that, The selection system includes: A memory used to store parameter information for multiple complex systems; and The processor is configured to perform the following operations: Obtain the first parameter of the compound system, the first parameter including the critical micelle concentration and the saturated adsorption concentration; Based on the first parameter of the compound system, the second parameter of the compound system is determined, and the second parameter includes the interaction parameters between molecules in the mixed micelle layer and the interaction parameters between molecules in the mixed adsorption layer. Based on the first and second parameters of the compound system, a target compound system is determined from a plurality of compound systems.

12. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform the selection method according to any one of claims 1-10.

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