CN111662408B - Oil displacement system suitable for high-temperature high-salt oil reservoir - Google Patents
Oil displacement system suitable for high-temperature high-salt oil reservoir Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
Abstract
The invention discloses an oil displacement system suitable for a high-temperature high-salt oil reservoir. The oil displacement system is prepared according to the following method: in an inert atmosphere, carrying out copolymerization reaction on a monomer A, a monomer B, a monomer C, a monomer D and an inorganic component in water in the presence of sodium formate, disodium ethylene diamine tetraacetate, ferrous sulfate, tetramethylethylenediamine, 4' -azobis (4-cyanovaleric acid), ammonium persulfate and hydrogen peroxide to obtain gel; and cutting the gel, adding sodium silicate and sodium pyrophosphate, standing for swelling, drying and crushing the swollen gel to obtain powder, namely the oil displacing system. The monomer adopted by the invention has higher activity (all the acryloyloxy monomers), is easy to prepare high molecular weight products, has excellent tackifying performance and small using amount. The oil displacement system is easy to store and convenient to transport, and meets the requirement of environmental protection. The method has the advantages of easily obtained raw materials and preparation process, and is suitable for industrial production.
Description
Technical Field
The invention relates to an oil displacement system suitable for a high-temperature high-salt oil reservoir, and belongs to the technical field of oilfield chemistry.
Background
Petroleum is one of indispensable non-renewable resources in modern society, and the exploitation and the utilization of the petroleum play an important role in the development of national economy. With the continuous progress of oil exploitation, at present, most of oil fields developed in China enter a high water cut period, and the yield can be stabilized only by a tertiary oil recovery technology, so that the crude oil recovery rate is improved. The chemical flooding technology is one of the main tertiary oil recovery technical measures for improving the crude oil recovery ratio in China, wherein the water-soluble polymer is one of key chemical agents for implementing chemical flooding, and the viscosity increasing property of the polymer is used for enlarging the swept volume of the displacement fluid, so that the aim of greatly improving the crude oil recovery ratio can be fulfilled. At present, tertiary oil recovery technologies such as polymer flooding, binary composite flooding (polymer-surfactant), ternary composite flooding (alkali-polymer-surfactant) and the like are widely applied to major oil fields in the east of victory, Daqing, Liaohe and the like, and remarkable oil increasing and water reducing effects and good economic and social benefits are obtained. With the continuous popularization and application of the chemical flooding technology in oil fields, the oil reservoir conditions for implementing chemical flooding are increasingly poor, high-temperature and high-salt oil reservoirs become main sites for the attack, the popularization and the application of the chemical flooding technology in future, but the currently used flooding polymer generally has the defects of no temperature resistance and no salt resistance, the application effect of the chemical flooding technology in the high-temperature and high-salt oil reservoirs is seriously influenced, and the chemical flooding technology becomes a technical bottleneck for restricting the popularization and the application of the chemical flooding technology in the high-temperature and high-salt oil reservoirs. Therefore, researches and developments of temperature-resistant, salt-resistant, efficient and stable polymer products for oil displacement are urgent.
From the viewpoint of the structure and properties of the polymer, the methods to maintain the viscosity of the acrylamide-based polymer in a salt solution at high temperature mainly include: (1) a polymer chain with large steric hindrance is introduced into a polymer main chain, so that the rigidity of the polymer chain is improved; (2) the interaction between polymer molecular chains is improved to maintain the hydrodynamic volume of the polymer molecular chains under saline solution and high temperature, and the viscosity is prevented from being greatly reduced. However, the introduction of excessive functional monomers increases the cost of the product; in addition, compared with acrylamide, the functional monomer is often poor in polymerization activity, so that the molecular weight of the copolymer is low, the tackifying performance of the copolymer is poor, and the use concentration of the product is increased; moreover, the hydrophilicity of partial functional monomers is not as good as that of acrylamide, so that the water solubility of the copolymer is reduced, the dissolving time is prolonged, and insoluble substances are increased, thereby improving the use difficulty of the product.
Chinese patent application (CN 102181010A) discloses a preparation method of a temperature-resistant and salt-resistant polymer, which comprises the following steps: dissolving an anionic monomer, sodium propenyl sulfonate, a cationic monomer, acrylate, alpha-olefin and acrylamide in deionized water, adding a surfactant, adjusting the pH of the solution to 9-10, introducing nitrogen for 30 minutes at 30-60 ℃, adding a persulfate initiator, reacting for 12 hours at 30-60 ℃, precipitating with acetone, washing, and drying in vacuum to obtain a white powdery polymer, wherein the obtained polymer can be used for polymer flooding to improve the recovery ratio. Chinese patent application (CN 103320111A) discloses a method for synthesizing a tetrapolymer oil-displacing agent, wherein the oil-displacing agent is a tetrapolymer formed by functional monomers (YEML) prepared from Acrylamide (AM), Acrylic Acid (AA), N-vinyl pyrrolidone (NVP), ethylenediamine and maleic anhydride. The synthesis method comprises the steps of firstly adding the prepared YEML monomer into a flask, then adding AM, NVP, AA and NaOH, introducing nitrogen for 30min, then adding an initiator, continuously introducing nitrogen for 10-20 min, and reacting for 4-12 h at the temperature of 30-60 ℃. And finally, washing with absolute ethyl alcohol, crushing and drying to obtain the AM/AA/NVP/YEML quadripolymer, wherein the prepared polymer can be used for improving the crude oil recovery rate.
In the method, the temperature resistance and salt resistance of the polymer are improved by introducing the functional monomer, and the following defects are often caused in the process: the preparation process of the functional monomer is complicated, and subsequent operations such as purification and the like are needed, so that the product cost is increased; compared with acrylamide monomers, the functional monomer has poor polymerization activity, the molecular weight of the polymer is not high, and the required polymer concentration is high in the using process; the introduction of the hydrophobic functional monomer and the internal salt functional monomer reduces the solubility of the polymer, and in the use process, the dissolution time of the polymer is prolonged, the proportion of insoluble substances is increased, and the use and popularization of the product are affected.
Disclosure of Invention
The invention aims to provide an oil displacement system suitable for a high-temperature high-salt oil reservoir, which adopts silicate ester condensation compound type inorganic components generated by the reaction of silicate ester under acidic conditions, and temporarily seals active sites on the surfaces of the inorganic components through calcium ions and tertiary amine; and then copolymerizing the inorganic component with water-soluble monomers such as acrylamide and the like and silicate ester monomers to obtain an inorganic-organic composite oil displacement system. On one hand, the inorganic component in the oil displacement system can improve the rigidity of polymer molecular chains and promote the formation of a network structure among polymer molecules; on the other hand, under high temperature and high salt conditions, as the blocking sites are activated, the inorganic components form aggregates with larger sizes, and the strength of the intermolecular network structure of the polymer is improved.
The silicate ester condensation compound type inorganic component in the oil displacement system provided by the invention refers to: silicate ester is subjected to condensation reaction under acidic condition to generate products with different molecular weights, and when the molecular weight is smaller, such as condensate of three molecules, five molecules, the product has certain water solubility and cannot reach nanometer scale in size; when the molecular weight is relatively large, such as several tens or hundreds of molecules of condensate, the product is water-insoluble nanoparticles, and thus, the silicate condensate type inorganic component includes a low-molecular silicate condensate and high-molecular inorganic nanoparticles.
The oil displacement system provided by the invention has good dissolving and dispersing properties in simulated mineralized water; the adhesive has excellent tackifying and anti-aging capabilities under the conditions of high temperature and high pressure; in an oil displacement experiment of the heterogeneous rock core, the method has the effect of remarkably improving the recovery ratio.
The preparation method of the oil displacement system suitable for the high-temperature and high-salinity oil reservoir provided by the invention comprises the following steps of:
in an inert atmosphere, carrying out copolymerization reaction on a monomer A, a monomer B, a monomer C, a monomer D and an inorganic component in water in the presence of sodium formate, disodium ethylene diamine tetraacetate, ferrous sulfate, tetramethylethylenediamine, 4' -azobis (4-cyanovaleric acid), ammonium persulfate and hydrogen peroxide to obtain gel; cutting the gel, adding a sodium silicate solution and a sodium pyrophosphate solution, standing for swelling (namely the gel swells and absorbs the sodium silicate and the sodium pyrophosphate), drying and crushing the swollen gel to obtain powder, namely the oil displacing system;
the A is acrylamide; the monomer B is one of dimethylacrylamide, diethylacrylamide, vinyl pyrrolidone and vinyl caprolactam; the monomer C is one of sodium acrylate, 2-acrylamide-2-methyl sodium propane sulfonate, sodium vinyl sulfonate and sodium styrene sulfonate; the monomer D is one of methacryloxypropyltrimethoxysilane, acryloxypropyltrimethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane;
the inorganic component is prepared by the following method:
reacting the compound I, the compound II, the compound III and calcium chloride under an acidic condition to obtain the compound I;
the structural formula of the compound I is shown as the formula I:
in the formula I, R1Is an alkyl group having 1 to 4 carbon atoms, R2H or alkyl with 1-4 carbon atoms; the structural formula of the compound II is shown as the formula II:
in the formula II, R3And R4All are alkyl groups with 1-4 carbon atoms, R3Is preferably-CH3、-CH2CH3；
The structural formula of the compound III is shown as a formula III-1, a formula III-2 or a formula III-3:
in the formula III-1, R5Is H or-CH3，R6And R7All the alkyl groups have 1-4 carbon atoms;
in the formula III-2, R8Is H or-CH3，R9And R10All the alkyl groups have 1-4 carbon atoms, m is 2-6, preferably 2;
in the formula III-3, R11Is allyl or alkyl with 1-4 carbon atoms, R12Is an alkyl group having 1 to 4 carbon atoms.
In the preparation method, under the conditions that the temperature is 0-10 ℃ and the pH is 7-9 (adjusted by a dilute NaOH solution), the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component are dissolved in water, and then the sodium formate, the disodium ethylenediamine tetraacetate, the ferrous sulfate, the tetramethylethylenediamine, the 4,4' -azobis (4-cyanovaleric acid), the ammonium persulfate and the hydrogen peroxide are added.
In the preparation method, the temperature of the copolymerization reaction is 0-10 ℃, the time is 1-10 h, and the preferable conditions are as follows: the temperature is 0-5 ℃, and the time is 4-9 h; the pH value is preferably 7.3-8.6.
In the preparation method, the mass fraction of the sodium silicate solution can be 10%;
the mass fraction of the sodium pyrophosphate solution can be 1%.
In the above preparation method, the mass ratio of the monomer a, the monomer B, the monomer C, the monomer D, and the inorganic component is 1: 0-0.4: 0.05-0.5: 0.001-0.05: 0.01 to 0.3, preferably 1: 0-0.2: 0.1-0.4: 0.005 to 0.025: 0.05-0.2, wherein the mass of the monomer A is not zero;
the mass ratio of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component to the water is 1: 1-10, preferably 1: 2-5;
in the above preparation method, the amount of the sodium formate is 50 to 1000ppm, preferably 100 to 600ppm, of the total mass of the monomer a, the monomer B, the monomer C, the monomer D and the inorganic component;
the dosage of the disodium ethylene diamine tetraacetate is 1-30 ppm, preferably 15-30 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the dosage of the ferrous sulfate is 0.2-5 ppm, preferably 0.5-3.5 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the amount of the tetramethylethylenediamine is 0.5-10 ppm, preferably 1.5-5 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the amount of the 4,4' -azobis (4-cyanovaleric acid) is 30 to 300ppm, preferably 40 to 100ppm, based on the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the using amount of the ammonium persulfate is 1-10 ppm, preferably 3-7 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the amount of the hydrogen peroxide is 0.1-5 ppm, preferably 1-3.5 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the mass ratio of the inorganic component to the sodium silicate solution to the sodium pyrophosphate solution is 1: 1-20: 0.1 to 10, preferably 1: 3-12: 0.5 to 6.
In the above preparation method, the mass ratio of the compound i, the compound ii, the compound iii and the calcium chloride is 1: 0.01-0.5: 0.5-5: 0.01 to 0.5, preferably 1: 0.05-0.5: 0.5-3: 0.05 to 0.2.
In the preparation method, the compound I, the compound II, the compound III and the calcium chloride react in a composite system of water, hydrochloric acid solution and ethanol;
the mass ratio of the compound I, the water, the hydrochloric acid solution and the ethanol is 1: 0.1-3: 0.01-0.1: 15-150, preferably 1: 0.2-1: 0.02-0.07: 20-80 parts;
the reaction temperature is 10-40 ℃, the reaction time is 1-24 h, and the following steps are preferred: the temperature is 20-35 ℃, and the time is 3-12 h.
In the above preparation method, the gel is dried under the following conditions: fluidized drying is carried out for 1-2 h at the temperature of 55-70 ℃.
The oil displacement system prepared by the method has excellent tackifying and anti-aging capabilities under the conditions of high temperature and high pressure, and the product has the effect of remarkably improving the recovery ratio in an heterogeneous core oil displacement experiment.
The oil displacement system provided by the invention comprises silicate ester condensation compound type inorganic components, and the silicate ester condensation compound type inorganic components and polymers form an inorganic-organic composite structure through hydrogen bonds and silicon-oxygen bonds, so that the rigidity of polymer molecular chains is improved, and the formation of a network structure among polymer molecules is promoted, thereby generating excellent performances of temperature resistance, salt resistance, ageing resistance and the like.
Part of active sites on the surface of the inorganic component in the oil displacement system are sealed by calcium ions or tertiary amine, and the sealed sites are activated under the conditions of high temperature and high salt, so that strong interaction is generated between the inorganic components, aggregates with larger size are formed, the strength of a network structure among polymer molecules is improved, and the tackifying effect of the system is enhanced.
According to the invention, the sodium silicate and the sodium pyrophosphate are used for controlling the crosslinking of inorganic components and silicate ester in the product in the drying process, so that the product has good water solubility.
The monomer adopted by the invention has higher activity (all the acryloyloxy monomers), is easy to prepare high molecular weight products, has excellent tackifying performance and small using amount. The oil displacement system is easy to store and convenient to transport, and meets the requirement of environmental protection. The method has the advantages of easily obtained raw materials and preparation process, and is suitable for industrial production.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1:
(1) preparation of the inorganic component
100g of compound I (R)1is-CH2CH3，R2is-CH2CH3) 35g of Compound II (R)3is-CH3，R4is-CH3) 150g of compound III (formula III-2, R)8Is H, R9、R10is-CH2CH3M is 2), 10g of calcium chloride, 4000g of ethanol, 50g of deionized water and 5g of hydrochloric acid solution (the concentration is 1mol/L) are added into a three-neck glass bottle provided with a stirrer, a spherical condenser tube and a thermometer, the reaction temperature is controlled at 30 ℃ after all raw materials are dissolved by stirring, the reaction is carried out for 8 hours, the product is centrifuged, washed by ethanol and acetone, and the volatile components are removed by reduced pressure distillation, thus obtaining the inorganic component.
(2) Preparation of oil displacing system
1000g of acrylamide, 100g of dimethylacrylamide, 200g of sodium vinylsulfonate, 16g of acryloyloxypropyltrimethoxysilane, 80g of inorganic components and 4000g of deionized water are added into a three-necked glass bottle provided with a stirrer, a nitrogen tube and a thermometer, the temperature is controlled at 0 ℃, the pH is controlled at 7.5, stirring is carried out, nitrogen is introduced until water-soluble monomers are completely dissolved, then 400mg of sodium formate, 34mg of disodium ethylenediaminetetraacetate, 3mg of ferrous sulfate, 5mg of tetramethylethylenediamine, 85mg of 4,4' -azobis (4-cyanovaleric acid), 7mg of ammonium persulfate and 3mg of hydrogen peroxide are sequentially added, reaction is carried out for 6 hours, the gel obtained by polymerization is chopped, 400g of a sodium silicate solution (the mass fraction is 10%) and 100g of a sodium pyrophosphate solution (the mass fraction is 1%) are added, the solution is placed at 30 ℃ for 3.5 hours (swelling), and drying the swelled product (fluidized drying at 65 ℃ for 1.5h) and crushing to obtain the product of the oil displacing system.
The monomers adopted by the invention are all acryloyl oxygen group type monomers, so that the invention has good polymerization activity, and does not adopt the complex structure monomers usually adopted by the existing high temperature resistant polymer synthesis, therefore, the high molecular weight product is easier to be prepared.
Example 2:
the procedure is as described in example 1, except that in step (1) 45g of compound II are added.
Example 3:
the procedure is as described in example 1, except that in step (1) 25g of compound II are added.
Example 4:
as described in example 1, except that R in the compound II in the step (1)3is-CH2CH3，R4is-CH2CH3。
Example 5:
the procedure is as described in example 1, except that in step (1), 250g of compound III (formula III-1) are added.
Example 6:
as described in example 1, except that in step (1), Compound III (formula III-1, R)5Is H, R6、R7is-CH2CH2CH3)。
Example 7:
as described in example 1, except that in step (1), Compound III (formula III-3, R)11Is allyl, R12is-CH2CH3) The amount added was 100 g.
Example 8:
the procedure is as described in example 1, except that the amount of calcium chloride added in step (1) is 15 g.
Example 9:
the procedure was as described in example 1, except that the amount of the hydrochloric acid solution added in step (1) was 3 g.
Example 10:
the procedure is as described in example 1, except that 80g of deionized water was used in the step (1).
Example 11:
the procedure is as described in example 1, except that the amount of ethanol added in step (1) is 6000 g.
Example 12:
the procedure is as described in example 1, except that the reaction temperature in step (1) is 35 ℃ and the reaction time is 5 hours.
Example 13:
the procedure is as in example 1, except that in step (2), monomer B is vinylpyrrolidone and is added in an amount of 60 g.
Example 14:
the procedure is as described in example 1, except that in step (2), the monomer C is sodium 2-acrylamido-2-methylpropanesulfonate in an amount of 150 g.
Example 15:
the procedure is as described in example 1, except that in step (2), monomer C is sodium 2-acrylamido-2-methylpropanesulfonate in an amount of 300 g.
Example 16:
as described in example 1, except that in step (2), monomer D was vinyltrimethoxysilane in an amount of 10 g.
Example 17:
as described in example 1, except that the amount of the inorganic component added in step (2) was 120 g.
Example 18:
except that the deionized water was added in an amount of 6000g in step (2) as described in example 1.
Example 19:
the procedure was as in example 1, except that the sodium silicate solution in step (2) was added in an amount of 600g and the sodium pyrophosphate solution was added in an amount of 200 g.
Example 20:
the procedure is as described in example 1, except that the polymerization temperature in step (2) is 2 ℃, the pH is 8.2 and the time is 8 h.
Comparative example 1:
tianjin Bohong petrochemical Co., Ltd., BHKY-3.
Comparative example 2:
huading hongji petroleum engineering technology (beijing) ltd, HDP 91014.
Performance evaluation:
first, evaluation of anti-aging performance
The aging resistance of the products of the comparative example and the example under the condition of high temperature and high salt is tested, and the test method is as follows: the agent was formulated as a 3000mg/L solution in simulated formation water (Table 1), each sample solution was aged at 110 ℃ for 20 days, the viscosity of the agent solution before and after aging was measured at 110 ℃ with a Haake MARS type III high temperature high pressure rheometer, the shear rate was measured as 7.34s-1. The results of the evaluation of the aging resistance of the sample are shown in Table 2.
As can be seen from the data in Table 2, compared with the existing industrial flooding polymer, the flooding system prepared by the invention has good viscosity increasing and anti-aging properties, and the viscosity of the agent solution can reach about 10mPas after aging for 20 days.
Evaluation of oil displacement performance
Experiment core: three-layer heterogeneous artificial square core (size 4.5X 30cm, permeability 0.5/1.0/3.0 μm2)；
Experimental oil: the viscosity of crude oil at 110 ℃ is 32 mPas;
the experimental agents were: the concentration is 3000mg/L, and the product is used after being aged for 20 days at 110 ℃;
water for experiment: simulated mineralized water (table 1).
The specific experimental steps are as follows: firstly, saturating formation water at a certain flow rate at 110 ℃, and calculating the permeability; secondly, the crude oil after saturated aging at a certain flow rate at 110 ℃ is recorded with the saturated oil amount; aging the model at 110 deg.C for 72 h; thirdly, water is driven at the flow rate of 1mL/min until the water content is more than 95 percent, 0.3PV medicament solution is injected at the flow rate of 0.5mL/min, and water is driven at the flow rate of 1mL/min until the water content is more than 98 percent; and fourthly, calculating the water flooding recovery ratio and the sample flooding recovery ratio.
The oil displacement performance evaluation results are shown in table 3.
As can be seen from the results in table 3, the flooding system prepared by the present invention has a more significant effect of enhancing the recovery efficiency compared to the existing industrial flooding polymer.
TABLE 1 simulation of ionic composition of formation water
| Ion species | Na++K+ | Ca2+ | Mg2+ | HCO3 - | SO4 2- | Cl- |
| Concentration (mg/L) | 10500 | 333 | 1280 | 165 | 2353 | 18538 |
TABLE 2 evaluation results of anti-aging Properties
TABLE 3 evaluation results of oil displacing Performance
Claims (10)
1. A preparation method of an oil displacement system suitable for a high-temperature high-salt oil reservoir comprises the following steps:
in an inert atmosphere, carrying out copolymerization reaction on a monomer A, a monomer B, a monomer C, a monomer D and an inorganic component in water in the presence of sodium formate, disodium ethylene diamine tetraacetate, ferrous sulfate, tetramethylethylenediamine, 4' -azobis (4-cyanovaleric acid), ammonium persulfate and hydrogen peroxide to obtain gel; cutting the gel, adding a sodium silicate solution and a sodium pyrophosphate solution, standing for swelling, drying and crushing the swollen gel to obtain powder, namely the oil displacing system;
the A is acrylamide; the monomer B is one of dimethylacrylamide, diethylacrylamide, vinyl pyrrolidone and vinyl caprolactam; the monomer C is one of sodium acrylate, 2-acrylamide-2-methyl sodium propane sulfonate, sodium vinyl sulfonate and sodium styrene sulfonate; the monomer D is one of methacryloxypropyltrimethoxysilane, acryloxypropyltrimethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane;
the inorganic component is prepared by the following method:
reacting the compound I, the compound II, the compound III and calcium chloride under an acidic condition to obtain the compound I;
the structural formula of the compound I is shown as the formula I:
formula I
In the formula I, R1Is an alkyl group having 1 to 4 carbon atoms, R2H or alkyl with 1-4 carbon atoms;
the structural formula of the compound II is shown as the formula II:
formula II
In the formula II, R3And R4All the alkyl groups have 1-4 carbon atoms;
the structural formula of the compound III is shown as a formula III-1, a formula III-2 or a formula III-3:
formula III-1
In the formula III-1, R5Is H or-CH3，R6And R7All the alkyl groups have 1-4 carbon atoms;
formula III-2
In the formula III-2, R8Is H or-CH3，R9And R10Are all made ofAn alkyl group having 1 to 4 carbon atoms, and m is 2 to 6;
formula III-3
In the formula III-3, R11Is allyl or alkyl with 1-4 carbon atoms, R12Is an alkyl group having 1 to 4 carbon atoms.
2. The method of claim 1, wherein: under the conditions that the temperature is 0-10 ℃ and the pH is 7-9, the monomer A, the monomer B, the monomer C, the monomer D and the inorganic components are dissolved in the water, and then the sodium formate, the disodium ethylene diamine tetraacetate, the ferrous sulfate, the tetramethylethylenediamine, the 4,4' -azobis (4-cyanovaleric acid), the ammonium persulfate and the hydrogen peroxide are added.
3. The production method according to claim 1 or 2, characterized in that: the temperature of the copolymerization reaction is 0-10 ℃, and the time is 1-10 h.
4. The production method according to claim 3, characterized in that: the sodium silicate is added in the form of a sodium silicate solution;
the sodium pyrophosphate is added in the form of a sodium pyrophosphate solution.
5. The method of claim 4, wherein: the mass ratio of the monomer A to the monomer B to the monomer C to the monomer D to the inorganic component is 1: 0-0.4: 0.05-0.5: 0.001-0.05: 0.01-0.3, wherein the mass of the monomer B is not zero;
the mass ratio of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component to the water is 1: 1 to 10.
6. The method of claim 5, wherein: the amount of the sodium formate is 50-1000 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the dosage of the disodium ethylene diamine tetraacetate is 1-30 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the dosage of the ferrous sulfate is 0.2-5 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the amount of the tetramethylethylenediamine is 0.5-10 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the amount of the 4,4' -azobis (4-cyanovaleric acid) is 30-300 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the using amount of the ammonium persulfate is 1-10 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the amount of the hydrogen peroxide is 0.1-5 ppm of the total mass of the monomer A, the monomer B, the monomer C, the monomer D and the inorganic component;
the mass ratio of the inorganic component to the sodium silicate solution to the sodium pyrophosphate solution is 1: 1-20: 0.1 to 10.
7. The method of claim 6, wherein: the mass ratio of the compound I to the compound II to the compound III to the calcium chloride is 1: 0.01-0.5: 0.5-5: 0.01 to 0.5.
8. The method of claim 7, wherein: reacting the compound I, the compound II, the compound III and the calcium chloride in a composite system of water, a hydrochloric acid solution and ethanol;
the mass ratio of the compound I, the water, the hydrochloric acid solution and the ethanol is 1: 0.1-3: 0.01-0.1: 15 to 150 parts by weight;
the reaction temperature is 10-40 ℃, and the reaction time is 1-24 h.
9. A flooding system prepared by the process of any one of claims 1 to 8.
10. The use of the oil displacement system of claim 9 as an oil displacement agent for high temperature and high salinity reservoirs.
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