CN112680207B - Surfactant composition for oil extraction in oil field and preparation method thereof - Google Patents
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Abstract
The invention provides a surfactant composition for oil extraction in an oil field and a preparation method thereof. According to the surfactant composition for oil field oil extraction, a pH response type surfactant with reversible charge conversion at a preset pH value and the type capable of being converted between an anion surfactant, an amphoteric surfactant and a cationic surfactant is compounded with a surfactant auxiliary agent formed by mixing conventional mesoporous silica nanoparticles and hydrophobic mesoporous silica nanoparticles, so that the surfactant composition for oil field oil extraction, which has high stability, can realize rapid demulsification and disperse large oil droplets into small oil droplets, and can intelligently regulate and control the stability, particle size and fluidity of the oil droplets, is obtained. The pH response type surfactant and the assistant mesoporous silica nanoparticles are utilized to realize the conversion between different surfactant types in the same oil displacement system, so that the oil displacement system can be widely applied to different oil extraction environments, and the crude oil recovery rate is improved in an all-round way by utilizing the conversion between different types of surfactants.
Description
Technical Field
The invention relates to the technical field of preparation of surfactants for oil extraction, in particular to a surfactant composition for oil extraction in an oil field and a preparation method thereof.
Background
The main functions of the surfactant in the enhanced oil recovery are to reduce the interfacial tension of the displacement fluid and the crude oil and improve the wettability of the oil reservoir. The surfactant has both oleophilic (hydrophobic) and hydrophilic (oleophobic) properties, so that when the surfactant is dissolved in water, molecules are mainly adsorbed on an oil-water interface, and the oil-water interface tension can be remarkably reduced. The reduction of the oil-water interfacial tension means that the surfactant can overcome the cohesive force among the crude oil and disperse large oil drops into small oil drops, thereby improving the passing rate of the crude oil when the crude oil flows through the pore throat. The oil displacement effect of the surfactant is also shown in that the oleophilic rock surface is changed into water-wet or neutral-wet, namely the adhesion work of the crude oil in an oil reservoir is reduced, so that the crude oil is easier to elute from the surface of the oil reservoir, and the oil washing efficiency is improved.
The petroleum industry is the root of the energy industry in China, and with the continuous improvement of the domestic petroleum demand, the petroleum becomes the bottleneck restricting the economic growth of China. In order to effectively enhance oil recovery, new surfactants have been studied in many cases, but the overall oil recovery is not good enough.
The invention patent with the application number of CN201910615572.3 discloses a tertiary oil recovery oil displacement agent with high recovery ratio. The oil displacement agent comprises the following raw materials in parts by weight: 1-2 parts of polyacrylamide, 0.4-0.6 part of modified nano silicon dioxide, 6-8 parts of surfactant, 0.5-1 part of sodium carbonate and 100-150 parts of water. The modified nano silicon dioxide is gamma-methacryloxypropyltrimethoxysilane modified nano silicon dioxide; the surfactant is sodium lignosulfonate, dodecyl dimethyl hydroxypropyl sulphobetaine and fluorocarbon surfactant. The modified nano silicon dioxide is selected and compounded with a proper surfactant, so that the compatibility of two-phase interfaces is increased, the dispersed phase is not easy to coagulate, the stability of emulsion is increased, and the recovery ratio is improved.
However, the recovery ratio of the oil displacement agent or the surfactant is not greatly improved, and the oil displacement agent or the surfactant cannot be widely applied to oil extraction environments in different environments, and has insufficient stability for an oil displacement system.
In view of the above, there is a need to design an improved surfactant composition for oil recovery in oil field and a preparation method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a surfactant composition for oil extraction in an oil field and a preparation method thereof.
In order to achieve the above object, the present invention provides a surfactant composition for oil recovery in an oil field, which is characterized in that: the surfactant composition for oil extraction in the oil field is prepared by compounding mesoporous silica nanoparticles and a pH response type surfactant; in the surfactant composition for oil field recovery, the pH response type surfactant can reversibly change the charged charge at a preset pH value, and the pH response type surfactant can change the charged charge among three types of anionic surfactant, amphoteric surfactant and cationic surfactant; the mesoporous silica nano-particles are surfactant auxiliaries compounded by conventional mesoporous silica nano-particles and hydrophobic modified mesoporous silica nano-particles.
In a further improvement of the present invention, in the surfactant composition for oil recovery in an oil field, the ratio of the pH-responsive surfactant to the mesoporous silica nanoparticles is (0.1 to 0.5) mmol: (0.05-0.2) g.
As a further improvement of the invention, in the surfactant auxiliary, the mass ratio of the conventional mesoporous silica nanoparticles to the hydrophobically modified mesoporous silica nanoparticles is (6-8): (2-4).
As a further improvement of the invention, the pH response type surfactant is 10-tertiary amine sodium decate, and the molecular formula is (CH)3)2NC9H18COONa。
As a further improvement of the invention, the pH response type surfactant is an anionic surfactant when the pH value is 8-10;
when the pH value is 5-7, the surfactant is an amphoteric surfactant;
when the pH value is 3-4, the cationic surfactant is used.
As a further improvement of the invention, when the pH-responsive surfactant is an anionic surfactant, the pH-responsive surfactant is (CH)3)2N-C9H18COONa；
When the pH response type surfactant is an amphoteric surfactant, the pH response type surfactant is (CH)3)2N+-C9H18COONa；
When the pH response type surfactant is a cationic surfactant, the pH response type surfactant is (CH)3)2N+-C9H18COOH。
In order to realize the purpose, the invention also provides a preparation method of the surfactant composition for oil recovery in the oil field. The preparation method of the pH response type surfactant comprises the following steps:
s1, placing 10-bromodecanoic acid, acetone and excessive dimethylamine aqueous solution in a reaction kettle, reacting at room temperature for 12-24 h, and performing rotary evaporation treatment to obtain an intermediate product;
s2, adding a sodium bicarbonate aqueous solution into the intermediate product, stirring for 10-30 min, performing rotary evaporation treatment to obtain a crude product, and recrystallizing the crude product in a first solvent to obtain 10-tertiary amine decaoic acid;
s3, dissolving the 10-tertiary amine decacarboxylic acid in ethanol, adding a sodium hydroxide solution at the temperature of 20-30 ℃, stirring for 2-5 h, adding acetonitrile, precipitating a reaction product, and then recrystallizing the reaction product in a second solvent to obtain the 10-tertiary amine decacarboxylic acid sodium.
As a further improvement of the invention, the rotating speed of the rotary evaporation treatment is 100-200 r/min; in the sodium bicarbonate water solution, the concentration of sodium bicarbonate is 0.01-0.5 mol/L; in the sodium hydroxide solution, the concentration of sodium hydroxide is 0.5-1.5 mol/L.
As a further improvement of the invention, the first solvent is an ethanol-ethyl acetate mixed solvent; the second solvent is an ethanol-acetonitrile mixed solvent.
As a further improvement of the invention, the preparation method of the mesoporous silica nanoparticle comprises the following steps:
p1, preparation of conventional mesoporous silica nanoparticles: preparing conventional mesoporous silica nanoparticles by using tetraethoxysilane as a silicon source, triethanolamine as an alkali catalyst and hexadecyl trimethyl ammonium p-toluenesulfonate as a template agent;
p2, hydrophobic modification treatment: vinyl triethoxysilane is used as a surface modifier, and a hydrothermal method is adopted to carry out modification treatment on the surface of the conventional mesoporous silica nano-particles, so as to prepare the hydrophobic modified mesoporous silica nano-particles.
The invention has the beneficial effects that:
1. according to the surfactant composition for oil extraction in the oil field, provided by the invention, the pH response type surfactant with reversible conversion of head group charges under a preset pH value and conversion of types among three surfactants of anion-amphoteric-cationic type is compounded with the conventional and hydrophobic mixed mesoporous silica nanoparticle surfactant auxiliaries, so that the surfactant composition for oil extraction in the oil field, which has high stability, can realize rapid demulsification and disperse large oil drops into small oil drops, and can intelligently regulate and control the stability, particle size and fluidity of the oil drops, is obtained. When the surfactant composition is applied to oil extraction in an oil field, the pH response type surfactant is adsorbed on an oil-water interface; the conventional mesoporous silica nanoparticles are dispersed in the water phase due to hydrophilicity so as to reduce the interfacial tension between the oil phase and the water phase and increase the hydrophilicity of the surface of the rock solid; and the mesoporous silica nanoparticles subjected to hydrophobic modification treatment are dispersed on an oil-water interface adsorbed by the pH response type surfactant to inhibit the adsorption loss of the shale sandstone solids to the surfactant. The three can be mutually cooperated to improve the recovery ratio of petroleum, and the cooperation mechanism is as follows:
in the enhanced oil recovery system of the composition, when the surfactant is ionic, the anionic or cationic surfactant is adsorbed on an oil-water interface, so that the oil-water interface tension can be reduced, the surface of oil drops can be partially charged, mesoporous silica nanoparticles with the same charge are dispersed in a continuous phase, and the electrostatic repulsion between the mesoporous silica nanoparticles and the oil drops is utilized to prevent the coalescence phenomenon between the oil drops, so that the state of small particle size of the oil drops can be stabilized, and the recovery ratio can be effectively improved. When the surfactant is in an amphoteric type, the electric layer repulsion of the conventional mesoporous silica nanoparticles with negative charges distributed in the water phase inhibits the desorption of the amphoteric surfactant from an oil-water interface, so that the surface tension in the system is in a descending trend, and the regulation and control of the particle size, the stability and the fluidity of oil drops are facilitated.
2. According to the surfactant composition for oil extraction in the oil field, when the surfactant composition is applied to oil extraction, the mixed mesoporous silica nanoparticles can spontaneously and rapidly diffuse and migrate to an oil-water two-phase interface, the hydrophilic conventional mesoporous silica nanoparticles containing hydroxyl invade into a water phase and have a good effect with the water phase, the mesoporous silica nanoparticles subjected to hydrophobic modification invade into an oil phase and interact with the oil phase, the hydrophilic nanoparticles and the hydrophobic nanoparticles interact with each other, the hydrophilic nanoparticles and the hydrophobic nanoparticles are aggregated at the oil-water interface, the stripping force is increased, and the recovery ratio is improved.
3. According to the surfactant composition for oil extraction in the oil field, provided by the invention, anionic, amphoteric and cationic surfactants can be respectively formed under different pH values, and can interact with the auxiliary agent mesoporous silica nanoparticles, so that different surfactant systems can be converted in the same system, the surfactant composition can be widely applied to different oil extraction environments, and the enhanced oil extraction function can be comprehensively realized by using the conversion among different types of surfactants.
4. The surfactant composition for oil extraction in the oil field provided by the invention adopts the inorganic silica nanoparticles with the mesoporous structure, and in the application of oil extraction, the surfactant can be adsorbed in the pores of the mesoporous nanoparticles through the interaction force, and the adsorption force of the surfactant is greater than that of the surfactant and the surface of a rock solid, so that the adsorption of the surfactant on the surface of the rock solid is greatly reduced, and the utilization rate of the surfactant is improved; when the surfactant system contacts crude oil, the adsorption force between the surfactant and the mesoporous nano particles is smaller than the interaction force between the surfactant and the crude oil, the surfactant is desorbed from the mesoporous silica nano particles and then is adsorbed to an oil-water interface, and the adsorption loss of the surfactant on the surface of the rock solid is effectively reduced, so that the synergistic process in the oil extraction process is completed between the inorganic silica nano particles with the mesoporous structure and the surfactant.
Drawings
Fig. 1 is a schematic flow chart of a method for preparing a pH-responsive surfactant according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the solution of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a preparation method of a surfactant composition for oil extraction in an oil field. Referring to fig. 1, the method for preparing the pH-responsive surfactant includes the following steps:
s1, placing 10-bromodecanoic acid, acetone and excessive dimethylamine aqueous solution in a reaction kettle, reacting at room temperature for 12-24 h, and performing rotary evaporation treatment to obtain an intermediate product;
s2, adding a sodium bicarbonate aqueous solution into the intermediate product, stirring for 10-30 min, performing rotary evaporation treatment to obtain a crude product, and recrystallizing the crude product in a first solvent to obtain 10-tertiary amine decaoic acid;
s3, dissolving the 10-tertiary amine decacarboxylic acid in ethanol, adding a sodium hydroxide solution at the temperature of 20-30 ℃, stirring for 2-5 h, adding acetonitrile, precipitating a reaction product, and then recrystallizing the reaction product in a second solvent to obtain the 10-tertiary amine decacarboxylic acid sodium.
The synthetic route of the pH response type surfactant is as follows:
preferably, the rotating speed of the rotary evaporation treatment is 100-200 r/min; in the sodium bicarbonate water solution, the concentration of sodium bicarbonate is 0.01-0.5 mol/L; in the sodium hydroxide solution, the concentration of sodium hydroxide is 0.5-1.5 mol/L.
Preferably, the first solvent is an ethanol-ethyl acetate mixed solvent; the second solvent is an ethanol-acetonitrile mixed solvent.
Preferably, the preparation method of the mesoporous silica nanoparticles subjected to hydrophobic modification treatment comprises the following steps:
p1, preparation of conventional mesoporous silica nanoparticles: preparing conventional mesoporous silica nanoparticles by using tetraethoxysilane as a silicon source, triethanolamine as an alkali catalyst and hexadecyl trimethyl ammonium p-toluenesulfonate as a template agent;
p2, hydrophobic modification treatment: vinyl triethoxysilane is used as a surface modifier, and a hydrothermal method is adopted to carry out modification treatment on the surface of the conventional mesoporous silica nano-particles, so as to prepare the hydrophobic modified mesoporous silica nano-particles.
The present invention will be described in further detail with reference to specific embodiments.
Example 1
The embodiment 1 of the invention provides a surfactant composition for oil extraction in an oil field, which is prepared by compounding mesoporous silica nanoparticles and a pH response type surfactant; the mesoporous silica nano-particles are surfactant auxiliaries compounded by conventional mesoporous silica nano-particles and hydrophobic modified mesoporous silica nano-particles.
The preparation method of the pH response type surfactant comprises the following steps:
s1, placing 5g of 10-bromodecanoic acid, a small amount of acetone and an excessive dimethylamine aqueous solution in a reaction kettle, reacting for 18h at room temperature, and then performing rotary evaporation treatment at a rotating speed of 200r/min to obtain an intermediate product;
s2, adding a sodium bicarbonate water solution with the concentration of 0.5mol/L into the intermediate product, stirring for 30min, performing rotary evaporation treatment at the rotating speed of 200r/min to obtain a crude product, and recrystallizing the crude product in an ethanol-ethyl acetate mixed solvent for three times to obtain 10-tertiary amine deca acid ((CH)3)2NC9H18COOH)；
S3, dissolving the 10-tertiary amine decacarboxylic acid in ethanol, adding 1.0mol/L sodium hydroxide solution at 25 ℃, stirring for 5h, adding acetonitrile, precipitating a white reaction product, and then recrystallizing the reaction product in an ethanol-acetonitrile mixed solvent to obtain 10-tertiary amine sodium decaacetate ((CH)3)2N-C9H18COONa)。
The preparation method of the mesoporous silica nano-particles comprises the following steps:
p1, preparation of conventional mesoporous silica nanoparticles: preparing conventional mesoporous silica nanoparticles by using tetraethoxysilane as a silicon source, triethanolamine as an alkali catalyst and hexadecyl trimethyl ammonium p-toluenesulfonate as a template agent;
p2, preparation of hydrophobically modified mesoporous silica nanoparticles: vinyl triethoxysilane is used as a surface modifier, and a hydrothermal method is adopted to carry out modification treatment on the surface of the conventional mesoporous silica nano-particles, and the specific process is as follows: adding 5g of conventional mesoporous silica nanoparticles into 100mL of absolute ethanol solution, and stirring to uniformly disperse the mesoporous silica nanoparticles; adding ammonia water into the silicon dioxide suspension, and adjusting the pH value to be neutral; then, 5mL of vinyltriethoxysilane was added to the suspension, and the reaction temperature was controlled at 60 ℃ and stirred slowly for 20 h. Filtering the obtained sample, repeatedly washing with ethanol, and performing suction filtration for 3 times, and vacuum drying the treated sample at 60 ℃ to obtain the hydrophobic modified mesoporous silica nanoparticles.
Compounding the prepared sodium 10-tertiary amine decate, conventional mesoporous silica nanoparticles and hydrophobically modified mesoporous silica nanoparticles to obtain the surfactant composition for oil extraction in the oil field, wherein the proportion of the three components is 0.3 mmol: 0.1 g: 0.5 g.
The pH response type surfactant 10-tertiary amine sodium decate is an anionic surfactant, the two ends of a molecular structure are respectively provided with a sodium carboxylate group and a tertiary amine group, and are both sensitive to pH values, when the pH value in a system changes, the sodium carboxylate group and the tertiary amine group positioned on the two sides can be subjected to successive protonation due to mutual competition, so that the molecular structure conversion process has three states of anionic type, amphoteric type and cationic type, and the following states are shown in the following steps:
when the surfactant composition system is used, the surfactant molecules are cationic surfactants (CH)3)2N+-C9H1810-tertiary amine decacarboxylic acid (CH) in the form of COOH3)2N+-C9H18COOH can be hydrophobized in situ to modify conventional mediaThe porous silica nanoparticles convert hydrophilic nanoparticles into hydrophobic nanoparticles, so that the hydrophobic nanoparticles in the system are increased, and the adsorption capacity of the hydrophobic mesoporous nanoparticles on the surfactant is enhanced, so that the adsorption of the surfactant on the surface of the rock solid is greatly reduced, the adsorption loss of the shale sandstone solid on the surfactant is inhibited, and the utilization rate of the surfactant is improved. Meanwhile, the electrostatic repulsion between hydrophobic mesoporous nanoparticles and oil drops can be utilized to prevent the coalescence phenomenon between the oil drops, so that the state of small particle size of the oil drops can be stabilized, and the recovery ratio can be effectively improved.
Comparative example 1
The difference from example 1 is that: the surfactant is 10-tertiary amine sodium decate only, and the auxiliary agent mesoporous silica nanoparticles are not added.
Comparative example 2
The difference from example 1 is that: the mesoporous silica nanoparticles of example 1 were replaced with conventional silica nanoparticles having no mesoporous structure.
Comparative example 3
The difference from example 1 is that: only the conventional hydrophilic mesoporous silica nanoparticles are adopted, and the hydrophobic modified mesoporous silica nanoparticles are not adopted.
Comparative example 4
The difference from example 1 is that: only the mesoporous silica nanoparticles after hydrophobic modification are adopted, and the conventional hydrophilic mesoporous silica nanoparticles are not adopted.
The surfactants prepared in example 1 and comparative examples 1 to 4 were subjected to oil recovery performance testing using an oil sand displacement test.
Preparing oil sand: weighing 500g of 100-sand 200-mesh quartz sand, adding 200mL of crude oil, and placing the mixture in an aging box for treatment at 120 ℃ for 48 hours to obtain the oil content of 14.02 wt%.
Preparing a sand filling pipe: firstly, a hollow cylindrical sand filling pipe with the length of 20cm and the inner diameter of 2.5cm is arranged in a rock core displacement experimental device, and the weight is recorded as m1(ii) a Then selecting the pretreated homemade oil sand with 100-200 meshes,filling the mixture into a sand filling pipe for multiple times for compaction, and weighing the weight as m2(ii) a Simulating a rock core of a rock core displacement experiment by using filled oil sand, wherein the quality of the simulated rock core is the quality m (m ═ m) of the oil sand in a sand filling pipe2-m1) And sealing. Measurement and calculation of porosity: known as VPipe98.125mL (cylinder volume) oil sand density ρSand2.65 g/mL. From the mass m of oil sand to m2-m1Mass m of oil contained in oil sandOilM × 14.02%, porosity PV 1- (m-m)Oil)/ρSand/VPipe。
And (3) displacement test: firstly, water is used for driving the sand filling pipe to generate no oil any more, and the water drives 2.5 PV; injecting nano dispersion liquid 1PV, and closing the well for 12 h; and (5) driving the well by water again for 2PV after the well is opened. The flow rate during the displacement process was constant at 0.5 mL/min.
The test conditions for each embodiment were: and (3) room temperature displacement, wherein the oil sand is 30g, the oil content is 4mL, the porosity is about 40%, and the water flooding recovery ratio is 8%.
Table 1 shows the oil recovery ratio of the surfactants prepared in example 1 and comparative examples 1 to 4
| Examples | Crude oil recovery (%) |
| Example 1 | 36.9％ |
| Comparative example 1 | 20.1％ |
| Comparative example 2 | 25.8％ |
| Comparative example 3 | 31.3％ |
| Comparative example 4 | 29.2％ |
As can be seen from table 1, the surfactant composition for oil recovery in oil field provided in example 1 has excellent recovery efficiency, much higher than the surfactant system of sodium 10-tertiary amine decate alone in comparative example 1. Meanwhile, the surfactant adjuvant of the mesoporous-structured nanoparticle used in example 1 has a higher synergistic recovery effect than the conventional nano silica particles provided in comparative example 2. The synergistic effect of the single species of hydrophilic or hydrophobic mesoporous nanosilica provided in comparative examples 3 and 4 is lower than the synergistic recovery effect of the two hybrid mesoporous silica nanoparticle surfactants, conventional and hydrophobic, provided in example 1.
In conclusion, the invention provides a surfactant composition for oil recovery in an oil field and a preparation method thereof. According to the invention, the surfactant composition for oil extraction in the oil field, which has high stability, can realize rapid demulsification and disperse large oil drops into small oil drops, and can intelligently regulate and control the stability, particle size and fluidity of the oil drops, is obtained by compounding the pH response type surfactant with which the charge can be reversibly converted under the preset pH value and the type of which can be converted between three surfactants of anion-amphoteric-cationic type and the conventional and hydrophobic mixed mesoporous silica nanoparticle surfactant auxiliaries. The pH response type surfactant and the auxiliary agent mesoporous silica nanoparticles are interacted, so that the conversion between different surfactant systems in the same system can be realized, the pH response type surfactant can be widely applied to different oil production environments, and the crude oil recovery rate can be comprehensively improved by using the conversion between different types of surfactants.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (7)
1. A surfactant composition for oil extraction in oil fields is characterized in that: the surfactant composition for oil extraction in the oil field is prepared by compounding mesoporous silica nanoparticles and a pH response type surfactant; the mesoporous silica nano-particles are surfactant auxiliaries compounded by conventional mesoporous silica nano-particles and hydrophobic modified mesoporous silica nano-particles; the pH response type surfactant is 10-tertiary amine sodium decate, and the molecular formula is (CH)3）2NC9H18COONa; the mesoporous silica nanoparticles subjected to hydrophobic modification treatment are mesoporous silica nanoparticles subjected to hydrophobic modification treatment by a vinyl triethoxysilane surface modifier.
2. The surfactant composition for oil recovery in oil field according to claim 1, characterized in that: in the surfactant composition for oil extraction in the oil field, the proportion of the pH response type surfactant to the mesoporous silica nanoparticles is (0.1-0.5) mmol: (0.05-0.2) g.
3. The surfactant composition for oil recovery in oil field according to claim 1, characterized in that: in the surfactant auxiliary, the mass ratio of the conventional mesoporous silica nanoparticles to the hydrophobically modified mesoporous silica nanoparticles is (6-8): (2-4).
4. A method for preparing the surfactant composition for oil recovery in the oil field according to any one of claims 1 to 3, characterized in that: the preparation method of the pH response type surfactant comprises the following steps:
s1, placing 10-bromodecanoic acid, acetone and excessive dimethylamine aqueous solution in a reaction kettle, reacting at room temperature for 12-24 h, and performing rotary evaporation treatment to obtain an intermediate product;
s2, adding a sodium bicarbonate aqueous solution into the intermediate product, stirring for 10-30 min, performing rotary evaporation treatment to obtain a crude product, and recrystallizing the crude product in a first solvent to obtain 10-tertiary amine decaoic acid;
s3, dissolving the 10-tertiary amine decacarboxylic acid in ethanol, adding a sodium hydroxide solution at the temperature of 20-30 ℃, stirring for 2-5 h, adding acetonitrile, precipitating a reaction product, and then recrystallizing the reaction product in a second solvent to obtain the 10-tertiary amine decacarboxylic acid sodium.
5. The method for preparing the surfactant composition for oil recovery in oil field according to claim 4, wherein: the rotating speed of the rotary evaporation treatment is 100-200 r/min; in the sodium bicarbonate water solution, the concentration of sodium bicarbonate is 0.01-0.5 mol/L; in the sodium hydroxide solution, the concentration of sodium hydroxide is 0.5-1.5 mol/L.
6. The method for preparing the surfactant composition for oil recovery in oil field according to claim 4, wherein: the first solvent is an ethanol-ethyl acetate mixed solvent; the second solvent is an ethanol-acetonitrile mixed solvent.
7. The method for preparing the surfactant composition for oil recovery in oil field according to claim 4, wherein: the preparation method of the mesoporous silica nano-particles comprises the following steps:
p1, preparation of conventional mesoporous silica nanoparticles: preparing conventional mesoporous silica nanoparticles by using tetraethoxysilane as a silicon source, triethanolamine as an alkali catalyst and hexadecyl trimethyl ammonium p-toluenesulfonate as a template agent;
p2, hydrophobic modification treatment: vinyl triethoxysilane is used as a surface modifier, and a hydrothermal method is adopted to carry out modification treatment on the surface of the conventional mesoporous silica nano-particles, so as to prepare the hydrophobic modified mesoporous silica nano-particles.
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