CN113122217A - Carbon-based amphiphilic nano-flow for oil displacement and preparation method thereof - Google Patents
Carbon-based amphiphilic nano-flow for oil displacement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a carbon-based amphiphilic nano-flow for oil displacement, which takes carbon-based nano-powder as a raw material and is modified by adopting a silane coupling agent and polyoxyethylene ether in sequence to obtain the carbon-based amphiphilic nano-flow; the carbon-based nano powder is selected from one of graphite powder, carbon powder, graphene or graphene oxide. The preparation method of the amphiphilic nano-flow comprises the following steps: dispersing carbon-based nano powder into a mixed solvent of toluene and dimethylformamide in a mass ratio, adding a silane coupling agent, hermetically stirring, reacting at 96 ℃ in an oil bath for 6 hours, and performing suction filtration, purification and drying to obtain silane coupling agent modified carbon-based nano powder; dispersing the carbon-based nano powder modified by the silane coupling agent into another mixed solvent of toluene and dimethylformamide in the same mass ratio; adding polyoxyethylene ether, stirring in a sealed way, reacting for 6 hours at 90 ℃ in an oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-flow. The carbon-based amphiphilic nano-flow can be directly prepared by using oilfield injection water to obtain a carbon-based amphiphilic nano-flow dispersion liquid.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a carbon-based amphiphilic nano-flow for oil displacement and a preparation method thereof.
Background
Since the first Janus concept proposed in the Nobel prize-winning thesaurus by Degennes in 1991, amphiphilic particles with asymmetry in chemical composition properties have been widely noticed by scholars at home and abroad. In recent years, the Janus-based particle nano-material has various types and has outstanding performances in many aspects such as mechanics, magnetics, optics, energy industry and the like. Since carbon has a large number of allotropes, particularly the preparation and research of carbon-based composite nano materials become research hotspots in academia, the carbon-based nano stream types and preparation methods prepared by the past scholars struggle, although the functionalization effect is more remarkable than that of the initial materials, the external instruments and equipment are often needed, or synthesis inducing conditions outside the properties of the materials are artificially given.
For example, Xiaopeng et al use interfacial self-assembly to prepare ultra-thin films of Carbon Nanotubes (CNTs). Further, the application of the functional modification of the self-initiated photo-grafting photopolymerization (S) molecule in the fields of sensors and transistors is studied. The experimental result strongly proves that the supermolecule self-assembly can be used for simply, conveniently and efficiently preparing the large-area conductive carbon-based ultrathin film, and the two-dimensional Janus hybrid ultrathin film obtained by selectively grafting the stimulus response polymer on the single surface can enable the stimulus response polymer and the carbon-based ultrathin film to cooperatively play a role, so that the application of the two-dimensional Janus hybrid ultrathin film in the fields of sensing, transistors and the like is greatly expanded.
Yuan kang of Jianghan university designs a SiO-based Yuan kang2The template is used for synthesizing the graphene-based amphiphilic nano material route, and amphiphilic graphene with one surface modified with EDTA and the other surface modified with a C18 chain is synthesized. He found out through experimental analysisThe enrichment capacity of the amphiphilic graphene on heavy metal ions is 2.4 times that of Graphene Oxide (GO), and the result shows that the Janus graphene is an efficient heavy metal ion adsorbent and has a certain application prospect in the aspect of environmental purification. The amphiphilic graphene synthesized by the method is hydrophilic (EDTA surface), hydrophobic (C18 surface) and has amphipathy similar to a surfactant, and preliminary research on the performance of the amphiphilic graphene applied to oil-water separation is carried out, and the result shows that the amphiphilic graphene has a good effect on removing trace oil drops in water.
For 70 years, China has jumped the world and becomes the first major country of energy production. Although the total reserve base number is large in the aspect of petroleum, the energy consumption demand is increasing day by day, the external dependence degree is already raised by half, and the improvement of the petroleum recovery ratio in China is the initial and mission of researchers in the petroleum field. After traditional tertiary oil recovery is followed by water injection or gas injection flooding, thermal flooding, microbial flooding and polymer flooding, the improvement of recovery ratio based on nano fluid becomes the main melody of the research of oil field workers at the present stage.
Disclosure of Invention
The invention aims to provide a carbon-based amphiphilic nano-flow for oil displacement and a preparation method thereof.
The carbon-based amphiphilic nano-flow for oil displacement provided by the invention takes carbon-based nano-powder as a raw material, and is modified by adopting a silane coupling agent and polyoxyethylene ether in sequence to obtain the carbon-based amphiphilic nano-flow.
The carbon-based nano powder is selected from one of graphite powder, carbon powder, graphene or graphene oxide, and the minimum dimension of any one dimension in three dimensions is 1nm-100 nm.
The silane coupling agent is one or the combination of two of gamma-aminopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane and N-2- (aminoethyl) -3-aminopropyltrimethoxysilane.
The weight average molecular weight of the polyoxyethylene ether is 260-6000 g/mol.
The carbon-based amphiphilic nano-flow for oil displacement is mainly suitable for water injection oil reservoir development. The carbon-based amphiphilic nano-flow dispersion liquid is prepared by directly using oilfield injection water. Moreover, the carbon-based amphiphilic nano-flow is compounded with a surfactant for use.
The preparation method of the carbon-based amphiphilic nano-flow comprises the following steps:
s1, adding 10-16g of carbon-based nano powder into 60-100g of mixed solvent, heating in an oil bath at 80 ℃, and stirring for 60min to obtain uniformly dispersed dispersion liquid; the mixed solvent is a mixture of toluene and dimethylformamide in equal mass ratio.
S2, adding 5-10g of silane coupling agent into the dispersion liquid obtained in the step S1 under the condition of oil bath temperature of 80 ℃, hermetically stirring, reacting for 6 hours at oil bath temperature of 96 ℃, and performing suction filtration, purification and drying to obtain the silane coupling agent modified carbon-based nano powder.
S3, adding 3-5g of the silane coupling agent modified carbon-based nano powder obtained in the step S2 into another 15-30g of mixed solvent, heating in an oil bath at 80 ℃, and stirring for 60min to obtain uniformly dispersed dispersion liquid; the mixed solvent is a mixture of toluene and dimethylformamide in equal mass ratio.
S4, adding 1.5-3.6g of polyoxyethylene ether into the dispersion liquid obtained in the step S3 at the temperature of 90 ℃ in an oil bath, hermetically stirring, reacting for 6 hours at the temperature of 90 ℃ in the oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-flow.
The proportion of the silane coupling agent and the molecular weight of the polyoxyethylene ether can be selected according to the geological conditions of the oil reservoir, namely the permeability, the heterogeneity and the wettability of the oil reservoir, and the lipophilicity-hydrophilicity of the carbon-based amphiphilic nano flow can be adjusted.
Compared with the prior art, the invention has the advantages that:
(1) the invention synthesizes the carbon-based amphiphilic nano-flow by an efficient and simple method, the carbon-based amphiphilic nano-flow configured by injected water is pumped into the stratum, the interfacial tension of the carbon-based amphiphilic nano-flow and crude oil reaches a low order of magnitude, the carbon-based amphiphilic nano-flow spontaneously enriches at an oil-water interface under the stratum shear flow condition to form an emulsion liquid film, the mobility ratio of water at the water-oil interface is reduced, the water-drive displacement front edge is stabilized, and the water-drive wave and the volume are enlarged. The carbon-based amphiphilic nano flow is directly injected by a water injection system without an additional injection system, so that energy is saved and emission is reduced.
(2) Meanwhile, the carbon-based amphiphilic nano-flow improves the wettability of the rock, so that the oil-wet rock surface is changed into a neutral-wet or even water-wet surface, the capillary power of displacement is improved, and the oil displacement efficiency is improved.
(3) The carbon-based amphiphilic nano-flow is cooperated to improve swept volume and microcosmic oil displacement efficiency, so that the crude oil recovery rate is efficiently improved.
(4) The carbon-based amphiphilic nano fluid serving as the high-efficiency oil displacement agent can be spontaneously enriched at an oil-water interface, is low in energy, is emulsified and washed, and has the characteristics of high efficiency, saving and environmental friendliness. The method provides a brand new thought for improving the crude oil recovery ratio and guaranteeing the crude oil yield and supply in China, and also provides an important theoretical support for the large-scale research and development and production of the oil displacement agent with great economic benefit and obvious effect.
(5) The method has the advantages of reliable principle, cheap and easily obtained raw materials, capability of producing the carbon-based amphiphilic nano-flow in a large scale, convenient storage, transportation and outstanding economic benefit and wide industrial application prospect. The application range is very wide, and the method covers all water injection oil reservoirs.
(6) The carbon-based amphiphilic nano-flow can also be compounded with a surfactant for use, and the crude oil recovery rate is greatly improved by exerting the synergistic effect of the interface fluidity control and the oil-water (ultra) low interface tension.
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
Figure 1, carbon-based amphiphilic nanofluid micrographs.
FIG. 2 shows that carbon-based amphiphilic nano-flow is enriched at a water-crude oil interface to form an emulsion liquid membrane diagram.
FIG. 3 is a diagram showing the oil displacement effect of petroleum sulfonate.
FIG. 4 is a diagram of the oil displacement effect of carbon-based amphiphilic nano-flow.
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
Adding 10g of graphite powder into a 500mL three-necked bottle, then adding 80g of toluene and a dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 5g of coupling agent N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane into the graphite powder solution at the temperature of 80 ℃ in an oil bath, sealing and stirring, carrying out a synthesis reaction for 6h at the temperature of 96 ℃ in the oil bath, and carrying out suction filtration, purification and drying to obtain the coupling agent modified graphite powder. Adding 3g of coupling agent modified graphite powder into a 500mL three-necked bottle, then adding 15g of toluene and dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 1.5g of polyoxyethylene ether into the graphite powder solution modified by the coupling agent at the temperature of 90 ℃ in an oil bath, hermetically stirring, reacting for 6 hours at the temperature of 90 ℃ in the oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-stream 1.
Example 2
Adding 13g of carbon powder into a 500mL three-necked bottle, then adding 90g of toluene and a dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 8g of coupling agent gamma-aminopropyl triethoxysilane into the carbon powder solution at the temperature of 80 ℃ in an oil bath, sealing and stirring, carrying out combined reaction for 6h at the temperature of 96 ℃ in the oil bath, and carrying out suction filtration, purification and drying to obtain the coupling agent modified carbon powder. Adding 6g of coupling agent modified carbon powder into a 500mL three-necked bottle, then adding 20g of toluene and dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 2.0g of polyoxyethylene ether into the coupling agent modified carbon powder solution at the temperature of 90 ℃ in an oil bath; and (3) sealing and stirring, reacting for 6 hours at 90 ℃ in an oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-stream 2.
Example 3
Adding 12g of graphene into a 500mL three-necked bottle, then adding 100g of toluene and a dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 5g of coupling agent N-2- (aminoethyl) -3-aminopropyltrimethoxysilane and 5g of coupling agent gamma-aminopropyltriethoxysilane into the dispersed graphene at the temperature of 80 ℃ in an oil bath, hermetically stirring, carrying out a combined reaction for 6h at the temperature of 96 ℃ in the oil bath, and carrying out suction filtration, purification and drying to obtain coupling agent modified graphene; adding 3.2g of coupling agent modified graphene into a 500mL three-necked bottle, then adding 30g of toluene and dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 3.3g of polyoxyethylene ether into the graphene solution modified by the coupling agent at the temperature of 90 ℃ in an oil bath, hermetically stirring, reacting for 6 hours at the temperature of 90 ℃ in the oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-stream 3.
Example 4
Adding 16g of graphene oxide into a 500mL three-necked bottle, then adding 100g of toluene and a dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 3g of coupling agent N-2- (aminoethyl) -3-aminopropyltrimethoxysilane and 7g of coupling agent N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane into the graphene oxide solution at the temperature of 80 ℃ in an oil bath, sealing and stirring, carrying out a synthesis reaction for 6h at the temperature of 96 ℃ in the oil bath, and carrying out suction filtration, purification and drying to obtain the coupling agent modified graphene oxide. Adding 3.6g of coupling agent modified graphene oxide into a 500mL three-necked bottle, then adding 30g of toluene and dimethylformamide solvent (mass ratio is 1:1), and stirring for 60min at 80 ℃ in an oil bath; adding 3.6g of polyoxyethylene ether into the coupling agent modified graphene oxide solution at the temperature of 90 ℃ in an oil bath, hermetically stirring, reacting for 6 hours at the temperature of 90 ℃ in the oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-stream 4.
The performance test was as follows:
(1) carbon-based amphiphilic nanoflow dimensions
15mg of the carbon-based amphiphilic nano-stream synthesized in the example 2 was dispersed in 10mL of distilled water, and sealed ultrasonic treatment was performed for 10min to obtain a carbon-based amphiphilic nano-stream dispersion. The microscopic morphology of the carbon-based amphiphilic nanoflows of the solution was observed with an environmental scanning microscope (SEM), as shown in fig. 1. SEM microscopic morphology shows that the carbon-based amphiphilic nano-flow is in a two-dimensional nano structure, and the thickness of the nano-sheet is about 3 nm.
(2) Oil-water interfacial tension of carbon-based amphiphilic nanoflows
Respectively preparing the mixture with the degree of mineralization of 3.0 multiplied by 104mg/L(Ca2+、Mg2+The concentration is 0.06X 104mg/L) number 1#, 5.0X 104mg/L(Ca2+、Mg2+The concentration is 0.15 × 104mg/L) number 2#, 7.5X 104mg/L(Ca2+、Mg2+The concentration is 0.2X 104mg/L) number 3#, 10X 104mg/L(Ca2+、Mg2+The concentration is 0.5X 104mg/L) Nos. 4# and 15X 104mg/L(Ca2+、Mg2+The concentration is 0.75 × 104mg/L) mineralized water No. 5# was stirred for 30 min.
Adding the carbon-based amphiphilic nano-flow synthesized in the example 1 into the No. 1, adding the carbon-based amphiphilic nano-flow synthesized in the example 2 into the No. 2, adding the carbon-based amphiphilic nano-flow synthesized in the example 3 into the No. 3, adding the carbon-based amphiphilic nano-flow synthesized in the example 2 into the No. 4, adding the carbon-based amphiphilic nano-flow synthesized in the example 4 into the No. 5, preparing a carbon-based amphiphilic nano-flow dispersion liquid with the mass concentration of 0.2% in mineralized water of the No. 1-5, and stirring and dissolving for 30 min.
Carbon-based amphiphilic nano-flow and degassed crude oil (50 ℃ C., shear rate 10 s) were measured at 50 ℃ using a TX500C rotary droplet interfacial tensiometer-1The viscosity under the condition is 35.8 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. As can be seen, the carbon-based amphiphilic nano-flow is 3.0-15 multiplied by 104The interface tension of oil and water is kept at 10 under the condition of mineralizing water by mg/L-1The mN/m order of magnitude shows that the carbon-based amphiphilic nano flow has good interfacial activity.
TABLE 1 Stable interfacial tensions of carbon-based amphiphilic nanoflows and crude oils
(3) Synergistic effect of carbon-based amphiphilic nano-flow and surfactant
Respectively preparing the mixture with the degree of mineralization of 3.0 multiplied by 104mg/L(Ca2+、Mg2+The concentration is 0.06X 104mg/L) number 1#, 5.0X 104mg/L(Ca2+、Mg2+The concentration is 0.15 × 104mg/L) number 2#, 7.5X 104mg/L(Ca2+、Mg2+The concentration is 0.2X 104mg/L) number 3#, 10X 104mg/L(Ca2+、Mg2+The concentration is 0.5X 104mg/L) Nos. 4# and 15X 104mg/L(Ca2+、Mg2+The concentration is 0.75 × 104mg/L) mineralized water No. 5# was stirred for 30 min.
The mineralization level of No. 1-5 is divided into two parts, adding 0.2% by mass sodium dodecyl sulfate into No. 1-1, 0.2% by mass sodium alpha-alkenyl sulfonate into No. 2-1, 0.2% by mass dodecyl betaine into No. 3-1, 0.2% by mass coconut monoethanolamide into No. 4-1, and 0.2% by mass dodecyl/tetradecyl glycoside into No. 5-1, and stirring for 30 min. Adding 0.15 mass percent of commercial sodium dodecyl sulfate and 0.05 mass percent of the carbon-based amphiphilic nano flow synthesized in the example 1 into 1# -2; 2# -2, adding 0.15% of commercial alpha-alkenyl sodium sulfonate and 0.05% of the carbon-based amphiphilic nano-flow synthesized in the example 2; 3# -2, adding commercial dodecyl betaine with the mass concentration of 0.15% and 0.05% of the carbon-based amphiphilic nano-flow synthesized in the example 3; 4# -2 was added with 0.15% by mass of commercially available coconut monoethanolamide, 0.05% of the carbon-based amphiphilic nanofluid synthesized in example 2; 5# -2 was added with 0.15% by mass of commercial dodecyl/tetradecyl glycoside, 0.05% of the carbon-based amphiphilic nanoflow of example 4; all are stirred and dissolved for 30 min. Carbon-based amphiphilic nano-flow and degassed crude oil (50 ℃ C., shear rate 10 s) were measured at 50 ℃ using a TX500C rotary droplet interfacial tensiometer-1The viscosity under the condition is 21.3 mPas), and the measurement time is 2h, so that a stable interfacial tension value is obtained, and the experimental result is shown in Table 2. It can be seen that the surfactant is in the range of 3.0 to 15X 104The interface tension of oil and water is kept at 10 under the condition of mineralizing water by mg/L-2The order of mN/m, the interfacial tension of the carbon-based amphiphilic nano flow and the surfactant compound system is lower, and the partial interfacial tension reaches 10-3The magnitude of mN/m indicates that the carbon-based amphiphilic nano-flow has good synergistic property when being used with various types of surfactants in a compounding way, and the oil displacement efficiency of the carbon-based amphiphilic nano-flow is improved.
TABLE 2 Stable interfacial tensions of carbon-based amphiphilic nanoflows and crude oils
| Mineralized water preparation system | Stable oil-water interfacial tension (mN/m) |
| 1#-1 | 0.062 |
| 1#-2 | 0.021 |
| 2#-1 | 0.043 |
| 2#-2 | 0.0087 |
| 3#-1 | 0.049 |
| 3#-2 | 0.031 |
| 4#-1 | 0.055 |
| 4#-2 | 0.0097 |
| 5#-1 | 0.076 |
| 5#-2 | 0.047 |
(4) Distribution of carbon-based amphiphilic nanoflows at oil-water interfaces
The carbon-based amphiphilic nanoflows prepared in example 2 were dispersed in 7.5 × 104mg/L(Ca2+、Mg2+The concentration is 0.2X 104mg/L) No. 3 mineralized water, and stirring for 1 hour to prepare carbon-based amphiphilic nano-flow dispersion liquid with the mass concentration of 0.10%. Then adding kerosene into the carbon-based amphiphilic nano-stream dispersion liquid according to the volume ratio of oil to water of 5:5, sealing, slightly oscillating by hand for 30-45s, standing for 2-4h, and observing the distribution condition of the carbon-based amphiphilic nano-stream, wherein the result is shown in figure 2. The concentration of the carbon-based amphiphilic nano-flow at the oil-water interface is obviously higher than that of other parts, and an obvious emulsion liquid film is formed with crude oil, so that the amphiphilic property of the carbon-based amphiphilic nano-flow is proved, and the carbon-based amphiphilic nano-flow can be spontaneously enriched at the oil-water interface and can be formed into the emulsion liquid film.
(5) Improvement of wettability of carbon-based amphiphilic nano-flow to rock
The carbon-based amphiphilic nanoflows prepared in example 3 were dispersed at 5 × 104mg/L(Ca2+、Mg2+The concentration is 0.15 × 104mg/L) No. 2# mineralized water, stirring for 1 hour, preparing carbon-based amphiphilic nano-flow dispersion liquid with mass concentration of 0.15%, and averagely dividing into two parts. Then respectively soaking natural oleophylic and hydrophilic rock slices (sandstone rocks) in the carbon-based amphiphilic nano-flow dispersion liquid, sealing, and contacting the carbon-based amphiphilic nano-flow with the rock core slices at the temperature of 100 ℃; the core fragments were tested for solid-water-crude oil contact angles using a DSA100 hanging drop interfacial tensiometer at different contact times, as shown in table 3. Rocks with contact angles greater than 90 ° are rendered oleophilic, and rocks less than 90 ° are rendered hydrophilic. As can be seen from table 3, the carbon-based amphiphilic nanoflow can change the oleophilic rock surface to a hydrophilic surface, while making the hydrophilic rock surface more hydrophilic.
TABLE 3 modification of rock wettability by carbon-based amphiphilic nanoflows
| Rock numbering | 0d (original contact angle) | 1d | 3d | 5d | 7d | 14d |
| 8-1 | 136.2° | 118.4° | 97.5° | 83.4° | 77.2° | 76.1° |
| 8-2 | 82.3° | 79.2° | 70.2° | 65.7° | 64.2° | 63.8° |
(6) Carbon-based amphiphilic nano-flow enhanced recovery performance
The degree of mineralization is 5.0 x 104mg/L(Ca2+、Mg2+The concentration is 0.15 × 104mg/L) of mineralized water, divided into two portions. One portion was added to the carbon-based amphiphilic nanofluid synthesized in example 4 to make a mass concentration of 0.And (3) stirring and dissolving 30% of carbon-based amphiphilic nano particles for 30min to obtain a carbon-based amphiphilic nano flow dispersion liquid. As a comparative experiment, the other part is added with commercially available graphene oxide (GO for short) and petroleum sulfonate (KPS) in sequence, slowly stirred and dissolved for 30min, and kept stand for 24 hours to prepare GO/KPS dispersion liquid with the mass concentration of 0.4% (wherein the concentration of GO is 0.15%, and the concentration of KPS is 0.25%). Two artificial two-layer heterogeneous cores (45X 300mm long core, gas permeability 100/500mD, porosity of 18-20 percent respectively), an experimental temperature of 90 ℃, crude oil viscosity of 27.3mPa & s, and original oil saturation of about 60 percent.
In the water flooding stage (the displacement speed is 1.0mL/min), the water flooding degree is low under the influence of adverse water-oil fluidity ratio, and the recovery ratio of 98 percent of water content is 39-42 percent. And injecting GO/KPS dispersion liquid, increasing injection pressure, discharging oil at an outlet end, expanding swept volume and improving oil displacement efficiency by GO regulation and KPS oil washing, improving crude oil recovery by 0.4 times of the pore volume of the GO/KPS dispersion liquid and subsequent water flooding by 18.5 percent, accumulating the recovery by 60.5 percent, and showing the displacement effect in figure 3. And after the other core is subjected to water flooding, injecting carbon-based amphiphilic nano dispersion liquid with the pore volume being 0.4 times that of the core and performing subsequent water flooding, wherein the injection pressure is increased, and oil is discharged from an outlet end. The in-situ carbon-based amphiphilic nano flow is proved to be spontaneously enriched at an oil-water interface, an emulsion liquid film is formed by adsorption at the oil-water interface under the induction of stratum shearing, the fluidity of the oil-water interface is regulated and controlled, and a displacement front edge is stabilized; in addition, the carbon-based amphiphilic nano dispersion reduces the oil-water interfacial tension and improves the wettability of a rock core, the microscopic oil displacement efficiency is improved, the recovery ratio of crude oil is improved by 25.3% through the in-situ carbon-based amphiphilic nano dispersion with 0.4 times of pore volume and subsequent water displacement, the cumulative recovery ratio reaches 64.3%, the displacement effect is shown in figure 4, the contrast shows that the recovery ratio of the carbon-based amphiphilic nano flow is 6.8% higher than that of the GO/KPS dispersion with high mass concentration, the cumulative recovery ratio is 3.8% higher, the carbon-based amphiphilic nano flow has the advantages of low concentration and high performance, and the recovery ratio improving effect is obvious.
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 (8)
1. A carbon-based amphiphilic nano-flow for oil displacement is characterized in that carbon-based nano-powder is used as a raw material, and a silane coupling agent and polyoxyethylene ether are sequentially adopted to modify the carbon-based amphiphilic nano-flow to obtain the carbon-based amphiphilic nano-flow; the carbon-based nano powder is selected from one of graphite powder, carbon powder, graphene or graphene oxide, and the minimum dimension of any one dimension in three-dimensional dimensions is 1nm-100 nm.
2. The carbon-based amphiphilic nano-stream for flooding according to claim 1, wherein the silane coupling agent is one or a combination of two of γ -aminopropyltriethoxysilane, N- (β -aminoethyl) - γ -aminopropylmethyldimethoxysilane, and N-2- (aminoethyl) -3-aminopropyltrimethoxysilane.
3. The carbon-based amphiphilic nano-flow for flooding according to claim 1, wherein the polyoxyethylene ether has a weight average molecular weight of 260-6000 g/mol.
4. The carbon-based amphiphilic nanofluid for flooding according to any one of claims 1 to 3, wherein the carbon-based amphiphilic nanofluid dispersion liquid is prepared by directly using oilfield injection water, and is suitable for water flooding oil reservoir development.
5. The carbon-based amphiphilic nanofluid for flooding according to any one of claims 1 to 3, wherein the carbon-based amphiphilic nanofluid is used in combination with a surfactant.
6. A method for the preparation of carbon-based amphiphilic nanoflows according to any one of claims 1-3, characterized by the following steps:
s1, dispersing the carbon-based nano powder in a mixed solvent of toluene and dimethylformamide in a mass ratio;
s2, adding the silane coupling agent into the dispersion liquid obtained in the step S1 at the temperature of 80 ℃ in an oil bath, hermetically stirring, reacting for 6 hours at the temperature of 96 ℃ in the oil bath, and performing suction filtration, purification and drying to obtain silane coupling agent modified carbon-based nano powder;
s3, dispersing the silane coupling agent modified carbon-based nano powder obtained in the step S2 into another mixed solvent of toluene and dimethylformamide in the same mass ratio;
s4, adding polyoxyethylene ether into the dispersion liquid obtained in the step S3 at the temperature of 90 ℃ in an oil bath, hermetically stirring, reacting for 6 hours at the temperature of 90 ℃ in the oil bath, and performing suction filtration, purification and drying to obtain the carbon-based amphiphilic nano-flow.
7. The method for preparing the carbon-based amphiphilic nano-stream according to claim 6, wherein the step S1 is specifically that the carbon-based nano-powder is added into a mixed solvent of toluene and dimethylformamide in equal mass ratio, heated in an oil bath at 80 ℃, and stirred for 60min to obtain a uniform dispersion liquid.
8. The method for preparing the carbon-based amphiphilic nanofluid according to claim 6, wherein the step S3 is specifically that the silane coupling agent modified carbon-based nanofluid obtained in the step S2 is added into another mixed solvent of toluene and dimethylformamide in the mass ratio, heated in an oil bath at 80 ℃, and stirred for 60min to obtain a uniform dispersion liquid.
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