CN113136193B - High-activity nano oil displacement agent and preparation method thereof - Google Patents
High-activity nano oil displacement agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-activity nano oil-displacing agent, which takes methylbenzene as a solvent, adopts silane coupling agent to graft and modify nano silicon dioxide, and obtains silane coupling agent modified nano silicon dioxide; then, taking toluene as a solvent, adopting polyoxyethylene ether surface modified silane coupling agent modified nano-silica, filtering, and drying to obtain a silicon-based nano-flow; finally, taking glycerol as a solvent, and curing the silicon-based nano-flow and alkanolamide or (and) alkyl glycoside to obtain the high-activity nano oil displacement agent. The high-activity nano oil displacement agent can be directly injected by oil field sewage (produced water). The interfacial tension of the high-activity nano flow solution and the crude oil reaches 10‑2～10‑4mN/m order of magnitude; the oil reservoir has the beneficial effects that the wettability of the oil reservoir is synergistically improved, the adhesion work of crude oil is reduced, Pickering emulsion is induced to be formed, the flow ratio of a water-oil interface is controlled, the crude oil recovery rate is greatly improved, the oil reservoir application covers high, medium and low permeability oil reservoirs, and the crude oil recovery rate is greatly improved.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a high-activity nano oil displacement agent and a preparation method thereof.
Background
In oilfield development and exploitation, tertiary oil recovery is a very important stage in which it has been difficult for conventional stimulation measures to achieve the desired stimulation effect. Research shows that binary combination flooding is an effective method for improving the recovery ratio of tertiary oil recovery.
The binary system has double functions, on one hand, the oil-water interfacial tension can be reduced, and the wettability can be changed; on the other hand, the fluidity between the displacing phase and the displaced phase can be controlled. The microscopic oil washing efficiency and the macroscopic sweep system are improved by 'double pipes'. Alkali-free binary compound flooding (SP) is the emerging green technology with the greatest prospect in chemical flooding Enhanced Oil Recovery (EOR) at present. The method avoids pollution damage of alkali in the ASP to the stratum, and the problems of alkali corrosion, scaling, clay migration and blockage and the like, has good precipitation and oil increasing effects, and simultaneously reduces the cost. For example, the interfacial tension of the gemini surfactant NNMB with the hydrophobically associating polymer NAPS and crude oil was studied by indoor simulation experiments under the condition of reservoir temperature (70 ℃). The results show that NAPS concentrations had no significant effect on NNMB; however, the effect of reducing the interfacial tension can be achieved by adding a certain amount of NaCl into the binary system. The binary combination flooding is suitable for the stratum with high mineralization degree, and can obtain good recovery effect.
However, the surfactant performance in the binary system is strict, and the interfacial tension must be reduced to be ultra-low (10) under the alkali-free condition-2～10-3mN/m) and the performance of the surfactant is stable and is not influenced or slightly influenced by stratum factors.
Compared with the traditional technology for improving the recovery ratio of crude oil by chemical displacement of reservoir oil, the modified nanoparticle dispersion system has good effects of increasing the yield and increasing the injection when being used for chemical displacement of reservoir oil. In recent five years, the exploration reserves of the low-permeability reservoirs in China account for 70 percent of the total exploration reserves, and the low-permeability-dense oil and gas resources become the main bodies of exploitation and development. The low-permeability oil-gas reservoir oil reservoir has small aperture and large seepage resistance, which causes difficulty in increasing the production of water drive. The novel nano oil displacement agent has high applicability to improving water injection efficiency of low-permeability reservoirs and implementing production increase measures, and can solve the engineering problems in oil and gas reservoir development, such as poor injection performance of low-permeability reservoirs, poor adaptability of complex stratums, reservoir damage and the like.
The nanofluids have more excellent properties due to their characteristics: the nano particles have good and stable dispersity in a motion state, and are not easy to cluster; the high-temperature high-salinity surfactant has good shearing resistance, good salt resistance and good thermal stability in a motion state, and avoids the problem that the surfactant generates precipitates in a high-temperature high-salinity stratum; secondly, the particle size of the nano fluid is smaller, so that the nano fluid can enter a tiny pore throat and has an effect; the nano particles can also change the structure of water molecule clusters, hydrogen bonds exist among water molecules, the water molecules can be associated into large molecular groups by the hydrogen bonds, the motion of the nano particles can influence the motion state of the water molecules, the injection capability of water is improved, the problem of difficulty in reaching a low-permeability area can be solved, and the reaching volume is enlarged.
Disclosure of Invention
The invention aims to provide a high-activity nano oil displacement agent.
The high-activity nano oil displacement agent provided by the invention is prepared by the following preparation method:
(1) dispersing nano silicon dioxide in toluene, and stirring for 30min at the temperature of 80 ℃ in an oil bath to obtain a dispersion liquid; adding a silane coupling agent into the dispersion liquid at the temperature of 80 ℃ in an oil bath, hermetically stirring, carrying out grafting reaction for 24 hours at the temperature of 80 ℃ in the oil bath, purifying and drying to obtain the silane coupling agent modified nano silicon dioxide. The particle size distribution of the nano silicon dioxide is 10-100 nm; the silane coupling agent is dodecyl trimethoxy silane or gamma-aminopropyl triethoxy silane.
(2) Dispersing the silane coupling agent modified nano silicon dioxide obtained in the step (1) in toluene, stirring for 30min at the temperature of 80 ℃ in an oil bath, then adding polyoxyethylene ether, stirring in a sealed manner, performing surface modification for 24h at the temperature of 80 ℃ in the oil bath, and purifying and drying to obtain the silicon-based nano flow. The polyoxyethylene ether has a weight average molecular weight of 10000-20000 g/mol.
(3) Dispersing the silicon-based nano flow in glycerol to prepare a silicon-based nano flow dispersion liquid with the mass concentration of 5-20%, then adding a surfactant, slowly stirring for 30min to prepare a surfactant solution with the mass concentration of 10-30%, and curing for 24h under the conditions of sealing and oil bath at 80 ℃ to obtain a high-activity nano oil-displacing agent; the surfactant is fatty acid alkanolamide or alkyl glycoside, or the combination of the fatty acid alkanolamide and the alkyl glycoside.
The high-activity nano oil displacement agent prepared by the invention has good dispersibility in oil field sewage (produced water), and can be directly prepared into high-activity nano flow solution by using the oil field sewage. The oil displacement mechanism of the binary system of the high-activity nano flow solution is as follows: (1) the interfacial tension of the high-activity nano-flow solution prepared from the oil field sewage (produced water) and the crude oil reaches 10-2～10-4mN/m order of magnitude; (2) the high-activity nano flow improves the wettability of an oil reservoir and reduces the adhesion work of crude oil on the surface of rock; (3) the water-oil interface is adsorbed on an oil-water interface under the shearing action to form Pickering emulsion, and the viscosity of the Pickering emulsion is higher than that of a water phase, so that the flow ratio of the water-oil interface is controlled, and the drainage front edge is stabilized; the number of capillary tubes is obviously increased through three-aspect synergistic effect, swept volume is enlarged, microscopic oil displacement efficiency is enhanced, and crude oil recovery rate is greatly increased.
Pickering emulsions have found use in the prior art in other oil field applications such as drilling fluids. The difference between the emulsion for well drilling and the Pickering emulsion for oil displacement is as follows: firstly, injecting the emulsion for well drilling into a stratum after the emulsion for well drilling is prepared on the ground; the Pickering emulsion used as the oil displacement agent is formed by the shear action of the nano particles in the stratum. The nano particles are enriched at an oil-water interface under the induction of stratum shear, and a Pickering emulsion is further constructed and formed. Secondly, the drilling fluid emulsion has short time in a shaft, but the Pickering emulsion with the oil displacement function formed in situ needs good fluidity control and dynamic shear stability in a porous medium. Therefore, the Pickering emulsion for oil displacement is different from the conventional Pickering emulsion.
Compared with the prior art, the invention has the advantages that:
(1) the high-activity nano oil-displacing agent is prepared by a simple method, is instant, does not need an additional injection system, and can be directly injected by using an injection system and sewage.
(2) The high-activity nano-flow binary composite system for oil field sewage (produced water) injection is pumped into the stratum, and the interfacial tension of the high-activity nano-flow solution and the crude oil reaches 10-2～10-4mN/m order of magnitude.
(3) The high-activity nano flow synergistically improves the wettability of an oil reservoir and reduces the adhesion work of crude oil on the surface of rock; and the high-activity nano-flow is adsorbed on an oil-water interface under the shearing action to form Pickering emulsion, and the viscosity of the Pickering emulsion is higher than that of a water phase, so that the flow ratio of the water-oil interface is controlled, the drainage front edge is stabilized, and the crude oil recovery rate is greatly improved.
(4) The in-situ high-activity nano oil displacement agent is prepared by a simple method, the principle of the method is reliable, the raw materials are cheap and easy to obtain, the repeatability is high, and the synthesis process is simple and convenient; the application range is wide, and the method is suitable for medium and low permeability water injection development oil reservoirs including high temperature and high salinity; has outstanding economic benefit and wide application prospect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is an infrared characterization of a silicon-based nanoflow.
FIG. 2 is a microscopic topography of a silicon-based nanofluid.
FIG. 3 is a diagram of the oil displacement effect of a binary system of nano-silica-sodium petroleum sulfonate.
FIG. 4 is a diagram of the oil displacement effect of the high-activity nano oil displacement agent.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
The preparation of the high-activity nano oil displacement agent comprises the following steps:
adding 6g of silicon dioxide with the particle size of 10-50nm into a 250mL three-necked bottle, then adding 40g of toluene, stirring for 30min at the temperature of 80 ℃ in an oil bath, and ensuring that the nano silicon dioxide is fully dispersed; adding 10g of dodecyl trimethoxy silane into a three-necked bottle dispersed with nano silicon dioxide at the temperature of 80 ℃ in an oil bath, hermetically stirring, carrying out grafting reaction for 24 hours at the temperature of 80 ℃ in the oil bath, purifying and drying to obtain the silane coupling agent modified nano silicon dioxide. Adding 4g of silane coupling agent modified nano silicon dioxide into a 250mL three-necked bottle, then adding 40g of toluene, carrying out oil bath at 80 ℃, and stirring for 30min to ensure that the silane coupling agent modified nano silicon dioxide is fully dispersed; adding 1.5g of polyoxyethylene ether with the molecular weight of 10000g/mol into a three-necked bottle dispersed with silane coupling agent modified nano silicon dioxide, sealing and stirring, performing surface modification at 80 ℃ in an oil bath, reacting for 24h, purifying and drying to obtain the silicon-based nano flow. Adding 3g of silicon-based nano flow into a 250mL three-necked bottle, then adding 30g of glycerol, stirring for dispersion, then adding 4g of fatty acid alkanolamide, slowly stirring for 30min, sealing, and curing for 24h at 80 ℃ in an oil bath to obtain the high-activity nano oil displacement agent.
Example 2
The preparation of the high-activity nano oil displacement agent comprises the following steps:
adding 8g of silicon dioxide with the particle size of 50-100nm into a 250mL three-necked bottle, then adding 60g of toluene, and stirring for 30min at the temperature of 80 ℃ in an oil bath to ensure that the nano silicon dioxide is fully dispersed; adding 16g of gamma-aminopropyltriethoxysilane into the three-necked bottle dispersed with the nano-silica under the condition of an oil bath at 80 ℃, hermetically stirring, carrying out grafting reaction for 24 hours at 80 ℃ in the oil bath, purifying and drying to obtain the silane coupling agent modified nano-silica. Adding 6g of silane coupling agent modified nano silicon dioxide into a 250mL three-necked bottle, then adding 60g of toluene, carrying out oil bath at 80 ℃, and stirring for 30min to ensure that the silane coupling agent modified nano silicon dioxide is fully dispersed; adding 4.0g of polyoxyethylene ether with the molecular weight of 20000g/mol into a three-necked bottle dispersed with silane coupling agent modified nano silicon dioxide, sealing and stirring, performing surface modification in an oil bath at 80 ℃, reacting for 24h, purifying and drying to obtain the silicon-based nano flow. Adding 3g of silicon-based nano flow into a 250mL three-necked bottle, then adding 50g of glycerol, stirring for dispersion, then adding 4g C8-C16 alkyl glucoside, slowly stirring for 30min, sealing, and curing for 24h under the condition of oil bath at 80 ℃ to obtain the high-activity nano oil-displacing agent.
Example 3
The preparation of the high-activity nano oil displacement agent comprises the following steps:
adding 6g of silicon dioxide with the particle size of 10-40nm into a 250mL three-necked bottle, then adding 50g of toluene, stirring for 30min at the temperature of 80 ℃ in an oil bath, and ensuring that the nano silicon dioxide is fully dispersed; adding 16g of gamma-aminopropyltriethoxysilane into a three-necked bottle dispersed with nano-silica at the temperature of 80 ℃ in an oil bath, hermetically stirring, carrying out grafting reaction for 24 hours at the temperature of 80 ℃ in the oil bath, purifying and drying to obtain the silane coupling agent modified nano-silica. Adding 4g of silane coupling agent modified nano silicon dioxide into a 250mL three-necked bottle, then adding 50g of toluene, carrying out oil bath at 80 ℃, and stirring for 30min to ensure that the silane coupling agent modified nano silicon dioxide is fully dispersed; adding 5.0g of polyoxyethylene ether with the molecular weight of 10000g/mol into a three-necked bottle dispersed with silane coupling agent modified nano silicon dioxide, sealing and stirring, performing surface modification at 80 ℃ in an oil bath, reacting for 24h, purifying and drying to obtain the silicon-based nano flow. Adding 3g of silicon-based nanoflow into a 250mL three-necked bottle, then adding 40g of glycerol, stirring for dispersion, then adding 5g of fatty acid alkanolamide, slowly stirring for 30min, and curing for 24h under the conditions of sealing and oil bath at 80 ℃ to obtain the high-activity nano oil displacement agent.
Example 4
The preparation of the high-activity nano oil displacement agent comprises the following steps:
adding 6g of silicon dioxide with the particle size of 60-100nm into a 250mL three-necked bottle, then adding 60g of toluene, and stirring for 30min at the temperature of 80 ℃ in an oil bath to ensure that the nano silicon dioxide is fully dispersed; adding 16g of dodecyl trimethoxy silane into a three-necked bottle dispersed with nano silicon dioxide at the temperature of 80 ℃ in an oil bath, hermetically stirring, carrying out grafting reaction for 24 hours at the temperature of 80 ℃ in the oil bath, purifying and drying to obtain the silane coupling agent modified nano silicon dioxide. Adding 4g of silane coupling agent modified nano silicon dioxide into a 250mL three-necked bottle, then adding 60g of toluene, carrying out oil bath at 80 ℃, and stirring for 30min to ensure that the silane coupling agent modified nano silicon dioxide is fully dispersed; adding 6.0g of polyoxyethylene ether with the molecular weight of 10000g/mol into a three-necked bottle dispersed with silane coupling agent modified nano silicon dioxide, sealing and stirring, performing surface modification at 80 ℃ in an oil bath, reacting for 24h, purifying and drying to obtain the silicon-based nano flow. Adding 4g of silicon-based nano flow into a 250mL three-necked bottle, then adding 60g of glycerol, stirring for dispersion, then adding 5g C14-C16 alkyl glycoside, slowly stirring for 30min, sealing, and curing for 24h under the condition of oil bath at 80 ℃ to obtain the high-activity nano oil-displacing agent.
And (3) performance testing:
(1) characterization of high-activity nano oil-displacing agent
The infrared characterization of the silicon-based nanoflows prepared in example 1 is shown in figure 1. Nano silicon dioxide: 3420cm-1The strong absorption peak is SiO21100cm, the absorption peak of the stretching vibration of-OH in different states on the surface-1And 800cm-1Has a relatively obvious stretching vibration absorption peak of the Si-O bond. Silicon-based nanoflow: 3424cm-1The strong absorption peak at the left and right is SiO22925cm of telescopic vibration seam with-OH in different surface states-1And 690.6cm-1The left and the right are added with absorption peaks which respectively correspond to methylene-CH2-a stretching vibration absorption peak of a carbon-carbon double bond; 1100cm-1The strong absorption peaks at the left and right are C-O-C and Si-O stretching vibration absorption peaks.
The surface of nano-silica has a large amount of hydroxyl groups (-OH), but the overall properties of the particles are still hydrophobic, and nano-silica is closely arranged with each other to form a hydrophobic skeleton. After hydrophilic modification, polyoxyethylene ether is connected to the surface of the high-activity nano-flow oil-displacing agent, the hydrophilic property is obviously increased, the oil-displacing agent is fluffy, and the dispersion property and the swelling property in a water phase are obviously increased.
The microscopic morphology of the high-activity nano oil-displacing agent is shown in fig. 2, and it can be known from the figure that the particle size of the high-activity nano oil-displacing agent is about 200nm and is relatively uniform. The infrared spectrum and the microscopic morphology characterization result prove that the preparation of the silicon-based nano-flow and high-activity nano-flow oil displacement agent is organically unified with the feasibility of synthesis in theory.
(2) Oil-water interfacial tension of high-activity nano oil displacement agent
Respectively preparing the mineralizing degrees of 1.0X 104mg/L(Ca2+、Mg2+The concentration is 0.05X 104mg/L) number 1#, 3.0X 104mg/L(Ca2+、Mg2+The concentration is 0.1 × 104mg/L) number 2#, 5.0X 104mg/L(Ca2+、Mg2+The concentration is 0.15 × 104mg/L) No. 3#, 7.5X 104mg/L(Ca2+、Mg2+The concentration is 0.3 × 104mg/L) Nos. 4# and 10X 104mg/L(Ca2 +、Mg2+The concentration is 0.5X 104mg/L) mineralized water No. 5 #.
The high-activity nano oil-displacing agent synthesized in example 1 is added into # 1, the high-activity nano oil-displacing agent synthesized in example 2 is added into # 2, the high-activity nano oil-displacing agent synthesized in example 3 is added into # 3, the high-activity nano oil-displacing agent synthesized in example 4 is added into # 4, the high-activity nano oil-displacing agent synthesized in example 4 is added into # 5, and the high-activity nano oil-displacing agent with the mass concentration of 0.3% is prepared in mineralized water 1-5 and is stirred and dissolved for 30 min.
Measuring high-activity nano oil displacement agent and degassed crude oil (80 ℃ and shear rate 10 s) at 80 ℃ by using TX500C rotary drop interfacial tensiometer-1The viscosity under the condition is 45.2 mPas), and the measurement time is 2h, so that a stable interfacial tension value is obtained, and the experimental result is shown in Table 1. The high-activity nano oil displacement agent is 1.0-10 multiplied by 104mineralized water at mg/L, oil-water interfacial tension is kept at 10-2～10-4The magnitude of mN/m indicates that the high-activity nano oil displacement agent can effectively displace crude oil and improve the microcosmic oil displacement efficiency.
TABLE 1 equilibrium interfacial tension of high-activity nano-displacement agent and crude oil
(3) Viscosity of Pickering emulsion formed by high-activity nano oil displacement agent and crude oil
The degree of mineralization is 7.5 multiplied by 104mg/L(Ca2+、Mg2+The concentration is 0.5X 104mg/L) of mineralized water, and the high-activity nano oil-displacing agent synthesized in the embodiment 4 is added to prepare a high-activity nano oil-displacing agent solution with the mass concentration of 0.4 percent. In a measuring cylinder with the measuring range of 50mL, the high-activity nano oil-displacing agent solution and degassed crude oil (the shear rate is 10s at 80℃)-1The viscosity of the condition is45.2 mPas) according to the water-oil volume ratio of 2:8, 3:7, 4:6, 5:5, 6:4, 7:3 and 8:2 (the water content is 20%, 30%, 40%, 50%, 60%, 70% and 80% in sequence), preparing the mixture into a total volume of 30mL, mixing and sealing; then stirring for 30min at 80 deg.C in oil bath, observing emulsification, and after stirring, using DV-III viscometer at 80 deg.C with shear rate of 10s-1The apparent viscosity of the emulsion was measured and is shown in Table 2.
TABLE 2 viscosity of the emulsion formed by the high activity nano oil displacement agent solution and the crude oil
The high-activity nano oil displacement agent is adsorbed on an oil-water interface under the shearing induction, a Pickering emulsion is formed under the condition that the water content is 30-80%, and the Pickering emulsion has higher viscosity than crude oil, so that the water-oil fluidity ratio is improved, the viscosity fingering of the displacement fluid is controlled, the swept volume is enlarged, and the crude oil recovery rate is improved.
(4) High-activity nano oil displacement agent for improving recovery efficiency
Preparing the mixture with the degree of mineralization of 10 multiplied by 104mg/L(Ca2+、Mg2+The concentration is 0.3 × 104mg/L) of mineralized water. The oil displacement agent is divided into two parts, and the high-activity nano oil displacement agent synthesized in the example 3 is added into one part of the oil displacement agent to prepare a high-activity nano oil displacement agent solution with the mass concentration of 0.35%. As a comparative experiment, the other part is added with commercial 10-40nm hydrophilic nano silicon dioxide (SiO for short) in sequence2) And sodium petroleum sulfonate (KPS), slowly stirring to dissolve for 30min, standing for 24 hr to obtain SiO 0.4 wt%2KPS solution (wherein SiO is present in the solution)2Concentration of (3) 0.15%, concentration of KPS 0.25%). Two artificial heterogeneous cores (
The core, gas permeability of 800mD, porosity of 19.1% and 20.2%, respectively, the experimental temperature of 80 ℃, the viscosity of crude oil of 45.2mPa & s, and the original oil saturation of about 65%.
In the water flooding stage (displacement speed 0.1mL/min), the unfavorable water is appliedThe influence of the oil fluidity ratio is low in the water driving degree, and the recovery ratio of 98 percent of water content is 39-42 percent. SiO implantation2The injection pressure of the/KPS solution is increased, the oil is discharged from the outlet end, and SiO is added2Perpass of the/KPS Dispersion through SiO2The regulation and control of the oil washing KPS and the expansion of swept volume and the improvement of oil displacement efficiency, 0.5 times of pore volume of SiO2The yield of crude oil is increased by 25% by the KPS dispersion and subsequent water flooding, the cumulative yield is increased by 64%, and the displacement effect is shown in figure 3. And after the other core is subjected to water drive until the water content is 98%, injecting a high-activity nano oil displacement agent with the pore volume being 0.4 times of the pore volume and performing subsequent water drive, increasing the injection pressure, and discharging oil at an outlet end. The fluidity control capability of the high-activity nano oil-displacing agent is proved, and the interfacial tension of the high-activity nano oil-displacing agent and the crude oil reaches 10-3-10-2mN/m order of magnitude, reducing 1000 times of adhesion work of crude oil on the surface of the rock, improving microscopic oil displacement efficiency, and synergistically improving the number of capillary tubes to 104An order of magnitude. The high-activity nano oil displacement agent with the pore volume of 0.4 times and the subsequent water flooding improve the crude oil recovery rate by 33 percent, the cumulative recovery rate reaches 75 percent, and the displacement effect is shown in figure 4. High recovery ratio and high mass concentration SiO by comparing high activity nano oil displacement agent2The KPS is 8% higher, the cumulative recovery ratio is 11% higher, and the high-activity nano oil displacement agent greatly improves the recovery ratio of the crude oil after water flooding.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A preparation method of a high-activity nano oil displacement agent is characterized by comprising the following steps:
(1) in a toluene solvent, carrying out modification grafting reaction on the nano silicon dioxide and a silane coupling agent for 24 hours at the temperature of 80 ℃ in an oil bath to obtain modified nano silicon dioxide; the particle size distribution of the nano silicon dioxide is 10-100 nm; the silane coupling agent is dodecyl trimethoxy silane or gamma-aminopropyl triethoxy silane;
(2) in a toluene solvent, modified nano-silica and polyoxyethylene ether are stirred in a sealing way, surface modification is carried out for 24 hours at the temperature of 80 ℃ in an oil bath, and silicon-based nanoflow is obtained after purification and drying; the weight average molecular weight of the polyoxyethylene ether is 10000-20000 g/mol;
(3) dispersing the silicon-based nano flow in glycerol to prepare a silicon-based nano flow dispersion liquid with the mass concentration of 5-20%, then adding a surfactant, slowly stirring for 30min to prepare a surfactant solution with the mass concentration of 10-30%, and curing for 24h under the conditions of sealing and oil bath at 80 ℃ to obtain a high-activity nano oil-displacing agent; the surfactant is fatty acid alkanolamide or alkyl glycoside, or the combination of the fatty acid alkanolamide and the alkyl glycoside.
2. The preparation method of the high-activity nano oil-displacing agent according to claim 1, wherein the step (1) is specifically as follows:
dispersing nano silicon dioxide in toluene to obtain dispersion liquid; adding a silane coupling agent into the dispersion liquid at the temperature of 80 ℃ in an oil bath, hermetically stirring, carrying out grafting reaction for 24 hours at the temperature of 80 ℃ in the oil bath, and purifying and drying to obtain the modified nano silicon dioxide.
3. The preparation method of the high-activity nano oil-displacing agent according to claim 1, wherein the step (2) is specifically as follows:
and (2) dispersing the modified nano silicon dioxide obtained in the step (1) in toluene, stirring for 30min at the temperature of 80 ℃ in an oil bath, then adding polyoxyethylene ether, stirring in a sealed manner, performing surface modification for 24h at the temperature of 80 ℃ in the oil bath, and purifying and drying to obtain the silicon-based nano flow.
4. A high-activity nano oil-displacing agent, which is prepared by the preparation method according to any one of claims 1 to 3.
5. The high-activity nano oil-displacing agent according to claim 4, wherein the high-activity nano oil-displacing agent can be directly injected by oil field sewage or oil field produced water.
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