CN112538127A - Polyacrylamide nano composite material and preparation method and application thereof - Google Patents
Polyacrylamide nano composite material and preparation method and application thereof Download PDFInfo
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Abstract
The application discloses a polyacrylamide nano composite material, a preparation method and an application thereof, wherein the polyacrylamide nano composite material is prepared by an acrylamide monomer and a nano material in situ; the insoluble matter content of the polyacrylamide nano composite material is less than or equal to 7 percent. The polyacrylamide nanocomposite is resistant to high temperature and salt, does not need to be added with a complexing agent in the preparation process, is low in cost, and has a good application prospect as an oil displacement agent.
Description
Technical Field
The application relates to a polyacrylamide nano composite material and a preparation method and application thereof, belonging to the technical field of high polymer material production.
Background
Petroleum, as "industrial blood", plays an irreplaceable role in national industrial development and national economy. With the continuous and stable increase of national economy, the demand of petroleum is continuously improved, the petroleum resource of per capita of China only accounts for 1/6 of the average level of the world, and nearly 50% of crude oil needs to be imported every year to meet the demand of national industry on petroleum.
Most oil fields developed in China enter the middle and later stages of development, the contradiction of the supply and demand relationship of petroleum is aggravated, and the increase of the yield and the efficiency of the petroleum yield are urgently required by the energy storage and the market demand. However, the traditional technology and materials for improving the recovery ratio are not yet required at present, and the research and development of novel materials and novel application technology are urgent.
A large number of data analyses indicate that polymers are the most potential and marketable product of all chemical materials in chinese oil fields. Along with the development of oil field exploration and development, the polymer is also developed to unconventional oil reservoir conditions of high temperature, high salinity, low permeability and the like, so higher technical and economic requirements are put forward on the polymer, and the research and development of novel temperature-resistant and salt-resistant polymers are important tasks for promoting the technical development of the petroleum industry in China.
Theoretically, almost any water-soluble and nontoxic polymer can be used in various fields such as the enhanced oil recovery of petroleum engineering, but the application of most polymers is limited by factors such as the complex conditions of oil reservoirs, the specific conditions of different oil reservoirs, cost performance and the like. There are two classes of polymers that are currently representative: synthetic polymers represented by partially hydrolyzed polyacrylamide (HAPM) and derivatives thereof and biological polymers represented by xanthan gum (XC); because HAPM has the advantages of low price, good viscosity and solubility and the like, the application of HAPM greatly exceeds that of biological polymers, and the HAPM is on the rise year by year, and the major petroleum countries in the world have extremely active research on the synthesis, production and application of HAPM, and particularly the synthesis research, production and use of HAPM in the aspect of ultra-high molecular weight polyacrylamide reach the international leading level. In recent years, water-soluble hydrophobic association polymers with unique properties have become the focus of experts and scholars, and are expected to be applied to oil and gas field development.
In the prior art, the uniform dispersion of nano inorganic particles in polymers is considered as the most fundamental problem to be solved. The problem that nanoparticles are agglomerated in the complex oil and gas exploitation application process is solved, and the method has general significance for constructing a complex oil and gas reservoir efficient diversion oil and gas channel and improving oil and gas exploitation and yield increase efficiency.
In the prior art, the chinese patent application CN1737053A provides a preparation process of polyacrylamide, which comprises using alcohols as solvent and reducing agent, selecting acrylamide monomer and noble metal salts as reactants, and reacting in microwave field at 250 ℃ and 100-. However, the patent requires reaction at high temperature of 100-250 ℃, which results in high energy consumption and increased cost for producing polyacrylamide.
Disclosure of Invention
According to one aspect of the application, the polyacrylamide nanocomposite is high-temperature resistant and salt resistant, a complexing agent is not required to be added in the preparation process, the cost is low, and the polyacrylamide nanocomposite can be used for preparing an oil displacement agent.
A polyacrylamide nanocomposite is prepared by in-situ preparation of an acrylamide monomer and a nanomaterial;
the insoluble matter content of the polyacrylamide nano composite material is less than or equal to 7 percent.
Optionally, the nanomaterial is a modified phyllosilicate.
Optionally, the modifier of the modified phyllosilicate comprises at least one of cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, or ethanolamine;
the phyllosilicate comprises at least one of nano-montmorillonite, calcium-montmorillonite and lithium-montmorillonite.
Optionally, the solid content of the polyacrylamide nanocomposite is more than or equal to 80%;
the particle size of the polyacrylamide nano composite material is 20-40 nm.
According to another aspect of the present application, there is provided a method for preparing a polyacrylamide nanocomposite, the method comprising the steps of: and (3) carrying out reaction I on a solution I containing acrylamide monomers and nano materials to obtain the polyacrylamide nano composite material.
Optionally, the mass ratio of the acrylamide monomer to the nanomaterial is 35-45: 0.1 to 0.5.
Optionally, the mass ratio of the acrylamide monomer to the nanomaterial is 38-42: 0.3 to 0.5.
Optionally, the solution I further comprises an auxiliary agent;
the mass ratio of the auxiliary agent to the acrylamide monomer is 0.2-1: 35-55.
Optionally, the mass ratio of the auxiliary agent to the acrylamide monomer is 0.3-1: 35-45.
Optionally, the mass ratio of the auxiliary agent to the acrylamide monomer is 0.5-0.8: 40-45.
Optionally, the auxiliary agent comprises at least one of urea, polyethylene glycol and weak base.
Optionally, the weak base comprises ammonia.
Optionally, the solution I further comprises an oxidizing agent;
the mass ratio of the oxidant to the acrylamide monomer is 0.32-1: 36-55.
Optionally, the mass ratio of the oxidant to the acrylamide monomer is 0.32-0.5: 36-45.
Optionally, the mass ratio of the oxidant to the acrylamide monomer is 0.32-0.3: 40-45.
Optionally, the oxidant comprises at least one of ammonium persulfate, potassium persulfate, and sodium persulfate.
Optionally, the solution I further comprises a reducing agent;
the mass ratio of the reducing agent to the acrylamide monomer is 0.32-1: 36-55.
Optionally, the mass ratio of the reducing agent to the acrylamide monomer is 0.32-0.5: 36-45.
Optionally, the mass ratio of the reducing agent to the acrylamide monomer is 0.32-0.3: 40-45.
Optionally, the reducing agent comprises at least one of sodium sulfite, sodium bisulfite, and potassium bisulfite.
Optionally, the solvent of solution I is selected from water.
Optionally, the reaction conditions of reaction I are: after deoxidization, reacting for 40-70 min at the temperature of 60-80 ℃ under the condition that the pH value is 6-8, and then preserving heat for 2-4 h at the temperature of 45-55 ℃.
Optionally, the reaction pH of the reaction I is 7-8.
Optionally, the upper limit of the reaction temperature of the reaction I is selected from 70 ℃, 75 ℃ and 80 ℃; the lower limit is selected from 60 deg.C, 65 deg.C, and 70 deg.C.
Optionally, the upper reaction time limit of reaction I is selected from 60min, 65min, 70 min; the lower limit is selected from 40min, 50min, and 60 min.
Optionally, the upper limit of the incubation time is selected from 3h, 3.5h, 4 h; the lower limit is selected from 2h, 2.5h and 3 h.
Optionally, the formulation of the solution I comprises the steps of: mixing an acrylamide monomer, an auxiliary agent and a solvent, stirring, adjusting the pH value to 6-8, adding a nano material, stirring, deoxidizing, and adding an oxidant and a reducing agent.
Optionally, the oxygen removal is specifically performed by introducing an inert gas for 10-30 min.
Optionally, the inert gas comprises at least one of nitrogen and an inert gas.
Optionally, the inert gas comprises at least one of argon, helium, neon.
Optionally, the oxygen removal is performed by introducing nitrogen with the purity of 99.999%, the pressure is 0.50-0.55 MPa, and the flow is 45-50 m3/h。
Optionally, after the reaction I is finished, the method further comprises the steps of dicing, fine granulation, drying and crushing.
Optionally, the preparation of the nanomaterial comprises the steps of: and (3) reacting II the solution II containing the phyllosilicate and the modifier to obtain the nano material.
Optionally, the particle size of the nano material is 800-1500 nm.
Optionally, the particle size of the nano material is 900-1200 nm.
Optionally, the particle size of the nano material is 900-1000 nm.
Optionally, the particle size of the nano material is 1000-1200 nm.
Optionally, the mass ratio of the phyllosilicate to the modifier is 8-13: 13 to 17.
Optionally, the mass ratio of the phyllosilicate to the modifier is 8-11: 15 to 17.
Optionally, the mass ratio of the phyllosilicate to the modifier is 9-11: 15 to 17.
Optionally, the reaction conditions of reaction II are: and (3) firstly reacting the solution II at 70-90 ℃ for 8-14 h, adding a solubilizer, and continuously reacting for 1-4 h.
Optionally, the solubilizing agent comprises span-80 (span-80) and/or tween-10 (tween-10).
Optionally, the mass ratio of the solubilizer to the layered silicate is 1-5: 7-11.
Optionally, the mass ratio of the solubilizer to the layered silicate is 2-5: 9-11.
Optionally, the reaction II is carried out under stirring, and the stirring frequency is 20-40 hz.
Alternatively, the solvent of solution II is selected from water.
Optionally, the formulation of the solution II comprises the steps of: mixing the layered silicate with solvent, swelling, heating, and adding modifier.
According to another aspect of the present application, there is provided a use of the polyacrylamide nanocomposite as defined in any one of the above or the polyacrylamide nanocomposite prepared by the preparation method as defined in any one of the above as an oil displacement agent.
As an embodiment, the preparation method of the polyacrylamide nanocomposite provided by the present application specifically includes the steps of:
a. mixing acrylamide monomer 40g and pure water 100g in a preparation kettle, adding auxiliary agent 1 0.2g and auxiliary agent 2 0.2g, and stirring for 45min at the frequency of 300 r/min;
b. adjusting the pH value of the reaction system to 6-8, adding 0.2g of nano material, and stirring for 30 min;
c. transferring the obtained mixed system to a polymerization kettle, introducing nitrogen for 30min, adding 0.32g of oxidant and 0.32g of reducing agent, polymerizing to generate a polyacrylamide nano composite material, reacting at 70 ℃ for 50-60 min, and keeping the temperature at 50 ℃ for 3 h;
d. pressing the obtained polyacrylamide nanocomposite material out of a polymerization kettle to obtain blocks, putting the blocks into a coarse granulating machine to perform coarse granulation, and then putting the blocks into a fine granulating machine to perform fine granulation to obtain 4-6 mm polyacrylamide nanocomposite particles;
e. enabling the obtained polyacrylamide nano composite material particles to enter a vibration drying bed for drying through a rotary flow-through machine, and controlling the temperature to be 50-60 ℃;
f. and crushing the obtained polyacrylamide nano composite material particles, sieving the crushed polyacrylamide nano composite material particles by a 60-mesh sieve, and packaging the sieved polyacrylamide nano composite material particles into a warehouse.
Optionally, the acrylamide monomer has a purity of greater than 90% and a polymerization inhibitor content of less than 0.3%.
Optionally, the auxiliary agent 1 in the step a is urea or polyethylene glycol.
Optionally, the assistant 2 in the step a is ammonia water or other weak base.
Optionally, the frequency of the stirrer in the step b is 300 r/min.
Optionally, the purity of the nitrogen in the step c is 99.999%, the pressure is 0.50-0.55 MPa, and the flow rate is 45-50 m 3/h.
Optionally, the oxidant in step c is at least one of ammonium persulfate, potassium persulfate and sodium persulfate.
Optionally, the reducing agent in step c is at least one of sodium sulfite, sodium bisulfite or potassium bisulfite.
Alternatively, the preparation of the nano-material in the step b is as follows,
1) mixing 10g of layered silicate and 100g of water in a multifunctional reaction kettle of 1 cubic meter, and swelling for 20-30 min under stirring;
2) heating the obtained reaction system to 80 ℃, adding 16g of modifier, setting the frequency of a stirrer to be 35hz, and reacting for 10-12 h;
3) adding 4g of solubilizer into the obtained reaction system, and reacting for 4-6 h;
optionally, the modifier in step 2) comprises at least one of cetyltrimethylammonium bromide, cetyltrimethylammonium chloride or ethanolamine.
Optionally, the solubilizing agent in step 3) comprises span-80 or tween-10.
The beneficial effects that this application can produce include:
1) the polyacrylamide nanocomposite provided by the application has the advantages of proper molecular weight, low content of insoluble substances, good water solubility and tackifying effect, high temperature resistance, salt resistance and reservoir protection in oil fields, no complexing agent (such as hydrotalcite slurry containing magnesium and aluminum, disodium ethylene diamine tetraacetate, tetrasodium ethylene diamine tetraacetate and the like) is required to be added in the preparation process, the cost is low, the preparation process is simple, and the polyacrylamide nanocomposite has good application prospect as an oil displacement agent.
2) According to the preparation method of the polyacrylamide nano composite material, the interlayer spacing of the nano material is modified and regulated, the hydrophilicity/lipophilicity of the nano material is modified, and the compatibility of the nano material in a reaction liquid is improved; then in-situ polymerization reaction is carried out, the contact of the nano material is blocked by winding the polymer coil, and the agglomeration is controlled; and secondly, the nano material is inserted or embedded and fixed in the polymer through the compatibility of the polymer and the nano material, so that the agglomeration of the nano material is effectively controlled.
3) The preparation method of the polyacrylamide nanocomposite provided by the application has the advantages of low raw material price, convenience and simplicity in preparation, easiness in operation, no need of reaction under high-temperature and strong-alkali conditions, and simplified reaction steps and reaction conditions.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The raw materials in the examples of the present application were all purchased commercially, unless otherwise specified.
The stirring frequency in the examples and comparative examples of the present application was 30 hz;
the nitrogen gas introduction parameters in the examples and the comparative examples of the application are as follows: the purity of the nitrogen is 99.999 percentThe pressure is 0.50-0.55 MPa, and the flow rate is 45-50 m3/h。
Examples 1-3 nanomaterial preparation
(1) Mixing 10g of layered silicate and 200ml of water in a multifunctional reaction kettle of 1 cubic meter, and swelling for 25min under stirring;
(2) heating the obtained reaction system to 80 ℃, adding 16g of modifier, and stirring for reaction for 12 hours;
(3) 4g of solubilizer was added to the reaction system obtained above, and the reaction was carried out for 4 hours.
The conditions or parameters that differ between examples 1-3 are shown in Table 1:
TABLE 1, specific parameters for nanomaterial preparation in examples 1-3
EXAMPLE 4 preparation of Polyacrylamide nanocomposites
(1) Mixing 40g of acrylamide monomer and 100g of pure water in a preparation kettle, adding 0.5g of urea and 0.2g of ammonia water, and stirring for 25 min;
(2) adjusting the pH value of the reaction system to 8, adding 0.4g of the nano material prepared in the example 1, and stirring for 15 min;
(3) transferring the obtained mixed system to a polymerization kettle, introducing nitrogen for 20min, adding 0.32g of sodium persulfate and 0.32g of potassium bisulfite, reacting at 70 ℃ for 60min, and then keeping the temperature at 50 ℃ for 3h to polymerize to generate a polyacrylamide nano composite material;
(4) pressing the obtained polyacrylamide nanocomposite material out of a polymerization kettle, cutting into blocks, putting the blocks into a coarse granulating machine for coarse granulation, and then putting the blocks into a fine granulating machine for fine granulation to obtain 4mm polyacrylamide nanocomposite particles;
(5) the obtained polyacrylamide nano composite material particles enter a vibration drying bed for drying through a rotary flow-through machine, and the temperature is controlled to be 60 ℃;
(6) and crushing the obtained polyacrylamide nano composite material particles, sieving the crushed polyacrylamide nano composite material particles by a 60-mesh sieve, and packaging the sieved polyacrylamide nano composite material particles into a warehouse. The detection performance of the product is shown in the following table 2, and the product is an anionic polyacrylamide nano composite material.
TABLE 2 product Properties of the Polyacrylamide nanocomposites prepared in example 4
| Serial number | Technical parameters | Technical index |
| 1 | Solid content | 80％ |
| 2 | Molecular weight | 750 ten thousand |
| 3 | Density of | 1.15g/cm3 |
| 4 | Intrinsic viscosity | 13dl/g |
| 5 | Insoluble substance | 7％ |
| 6 | Temperature resistance | 130.0～140.0℃ |
| 7 | API dehydration | 8ml |
| 8 | Core permeability recovery/% | 96.5％ |
EXAMPLE 5 preparation of Polyacrylamide nanocomposites
(1) Mixing 40g of acrylamide monomer and 100g of pure water in a preparation kettle, adding 0.5g of urea and 0.2g of ammonia water, and stirring for 25 min;
(2) adjusting the pH value of the reaction system to 8, adding 0.2g of the nano material prepared in the example 1, and stirring for 15 min;
(3) transferring the obtained mixed system to a polymerization kettle, introducing nitrogen for 20min, adding 0.32g of sodium persulfate and 0.32g of potassium bisulfite, reacting at 70 ℃ for 60min, keeping the temperature at 50 ℃ for 3h, and polymerizing to generate a polyacrylamide nano composite material;
(4) pressing the obtained polyacrylamide nanocomposite material out of a polymerization kettle, cutting into blocks, putting the blocks into a coarse granulating machine for coarse granulation, and then putting the blocks into a fine granulating machine for fine granulation to obtain 5mm polyacrylamide nanocomposite particles;
(5) the obtained polyacrylamide nano composite material particles enter a vibration drying bed for drying through a rotary flow-through machine, and the temperature is controlled to be 60 ℃;
(6) and crushing the obtained polyacrylamide nano composite material particles, sieving the crushed polyacrylamide nano composite material particles by a 60-mesh sieve, and packaging the sieved polyacrylamide nano composite material particles into a warehouse.
The detection performance of the product is shown in the following table 3, and the product is an anionic polyacrylamide nano composite material with the particle size of 20-40 nm.
TABLE 3 product Properties of the Polyacrylamide nanocomposites prepared in example 5
| Serial number | Technical parameters | Technical index |
| 1 | Solid content | 85％ |
| 2 | Molecular weight | 850 million |
| 3 | Density of | 1.10g/cm3 |
| 4 | Intrinsic viscosity | 14dl/g |
| 5 | Insoluble substance | 3％ |
| 6 | Temperature resistance | 170.0～200.0℃ |
| 7 | API dehydration | 10ml |
| 8 | Core permeability recovery/% | 97.5％ |
Comparative example 1 preparation of polyacrylamide nanocomposite
(1) Mixing 40g of acrylamide monomer and 100g of pure water in a preparation kettle, adding 0.5g of urea and 0.2g of ammonia water, and stirring for 25 min;
(2) transferring the obtained mixed system to a polymerization kettle, introducing nitrogen for 20min, adding 0.32g of sodium persulfate and 0.32g of potassium bisulfite, reacting at 70 ℃ for 60min, and keeping the temperature at 50 ℃ for 3h to polymerize to generate polyacrylamide;
(3) pressing the obtained polyacrylamide out of a polymerization kettle to be cut into blocks, putting the blocks into a coarse granulating machine to perform coarse granulation, and then putting the blocks into a fine granulating machine to perform fine granulation to obtain 6mm polyacrylamide particles;
(4) drying the obtained polyacrylamide particles in a vibration drying bed through a rotary flow-through machine, and controlling the temperature to be 60 ℃;
(5) the polyacrylamide particles obtained above are crushed and sieved by a 60-mesh sieve. The product detection properties are as follows in table 4:
TABLE 4 product Properties of the polyacrylamide nanocomposites prepared in comparative example 1
| Serial number | Technical parameters | Technical index |
| 1 | Solid content | 82％ |
| 2 | Molecular weight | 650 ten thousand |
| 3 | Density of | 1.10g/cm3 |
| 4 | Intrinsic viscosity | 11.5dl/g |
| 5 | Insoluble substance | 10％ |
| 6 | Temperature resistance | 70.0～80.0℃ |
| 7 | API dehydration | 10ml |
| 8 | Core permeability recovery/% | 85.5％ |
Example 6 oil-displacing effect experiment
(1) Water for experiment: 9 pieces of simulated water in the forest have the total mineralization of 28678.1mg/L and the water type is CaCl2Type, specific ionic composition is shown in table 5 below:
TABLE 5 ion analysis of 9 injected water in forest
(2) Experimental oil: and adding white oil into 9 pieces of site crude oil in the dewatered forest for compounding, wherein the viscosity of underground crude oil is 87.2mPa.s (55 ℃).
(3) Experiment core: the specific parameters of the domestic core are shown in a table 6:
TABLE 6 core parameters
(4) Injection system (flooding agent): the results of the performance evaluation of the polyacrylamide nanocomposites prepared in example 5 at a concentration of 2000ppm (stock solution concentration of 20000ppm) are shown in Table 7:
TABLE 7 evaluation results of repellent Properties
(5) Experiment temperature: at 55 ℃.
(6) Experimental procedure
(a) Weighing dry weight of the dried core, weighing wet weight after vacuumizing and saturating simulation water, and calculating pore volume;
(b) water permeability (not performed this time): injecting water at the speed of 0.5mL/min, and calculating the permeability of the rock core water after the injection pressure is stable;
(c) saturated oil: placing the core in a 55 ℃ drying oven to saturate crude oil until the produced liquid does not contain water, recording the produced water amount, and calculating the oil saturation;
(d) water flooding: performing water flooding at the speed of 0.5mL/min, recording the liquid production amount, the water production amount, the oil production amount and the pressure at intervals, and displacing until the comprehensive water content reaches 98%;
(e) agent flooding: injecting the prepared flooding agent 1PV at the speed of 0.5mL/min, and recording the liquid yield, the water yield, the oil yield and the pressure at intervals;
(f) and (3) subsequent water flooding: performing water flooding at the speed of 0.5mL/min, recording the liquid production amount, the water production amount, the oil production amount and the pressure at intervals, and displacing until the comprehensive water content reaches 98%.
(7) Results of the experiment
(a) Pressure of
Core injection pressure changes are shown in table 8:
table 8 core injection pressure change
| Core numbering | Water drive equilibrium pressure, MPa | Agent flooding equilibrium pressure, MPa | Plugging rate% |
| L19-10 | 0.1227 | 0.269 | 54.39 |
(b) Oil displacement effect
The enhanced recovery effect is shown in table 9:
table 9 oil displacing effect
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. The polyacrylamide nanocomposite is characterized in that the polyacrylamide nanocomposite is prepared by in-situ preparation of an acrylamide monomer and a nanomaterial;
the insoluble matter content of the polyacrylamide nano composite material is less than or equal to 7 percent.
2. The polyacrylamide nanocomposite as recited in claim 1, wherein the nanomaterial is a modified layered silicate;
preferably, the modifier of the modified phyllosilicate comprises at least one of cetyltrimethylammonium bromide, cetyltrimethylammonium chloride or ethanolamine;
the phyllosilicate comprises at least one of nano-montmorillonite, calcium-montmorillonite and lithium-montmorillonite.
3. The polyacrylamide nanocomposite as recited in claim 1, wherein the polyacrylamide nanocomposite has a solid content of 80% or more;
the particle size of the polyacrylamide nano composite material is 20-40 nm.
4. A method for preparing a polyacrylamide nanocomposite, the method comprising the steps of: and (3) carrying out reaction I on a solution I containing acrylamide monomers and nano materials to obtain the polyacrylamide nano composite material.
5. The preparation method according to claim 4, wherein the mass ratio of the acrylamide monomer to the nanomaterial is 35-45: 0.1 to 0.5.
6. The method according to claim 4, wherein the solution I further comprises an auxiliary agent;
the mass ratio of the auxiliary agent to the acrylamide monomer is 0.2-1: 35-55;
preferably, the auxiliary agent comprises at least one of urea, polyethylene glycol and weak base;
preferably, the weak base comprises ammonia;
preferably, the solution I further comprises an oxidizing agent;
the mass ratio of the oxidant to the acrylamide monomer is 0.32-1: 36-55;
preferably, the oxidant comprises at least one of ammonium persulfate, potassium persulfate, and sodium persulfate;
preferably, the solution I further comprises a reducing agent;
the mass ratio of the reducing agent to the acrylamide monomer is 0.32-1: 36-55;
preferably, the reducing agent comprises at least one of sodium sulfite, sodium bisulfite and potassium bisulfite;
preferably, the solvent of the solution I is selected from water;
preferably, the reaction conditions of the reaction I are: after deoxidization, reacting for 40-70 min at the temperature of 60-80 ℃ under the condition that the pH value is 6-8, and then preserving heat for 2-4 h at the temperature of 45-55 ℃;
preferably, the preparation of the solution I comprises the following steps: mixing an acrylamide monomer, an auxiliary agent and a solvent, stirring, adjusting the pH value to 6-8, adding a nano material, stirring, deoxidizing, and adding an oxidant and a reducing agent.
7. The method for preparing a nano-material according to claim 4, wherein the preparing of the nano-material comprises the steps of: reacting II the solution II containing the phyllosilicate and the modifier to obtain the nano material;
preferably, the mass ratio of the phyllosilicate to the modifier is 8-13: 13 to 17.
8. The method according to claim 7, wherein the reaction conditions of the reaction II are as follows: the solution II is firstly reacted for 8-14 h at 70-90 ℃, a solubilizer is added, and the reaction is continued for 1-4 h;
the solubilizer comprises span-80 and/or tween-10;
the mass ratio of the solubilizer to the layered silicate is 1-5: 7-11;
preferably, the solvent of solution II is selected from water.
9. The method for preparing a compound of claim 7, wherein the preparation of the solution II comprises the following steps: mixing the layered silicate with solvent, swelling, heating, and adding modifier.
10. Use of the polyacrylamide nanocomposite according to any one of claims 1-3 or the polyacrylamide nanocomposite prepared by the preparation method according to any one of claims 4-9 as an oil displacement agent.
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