CN111849446A

CN111849446A - Tackifying composition and preparation method and application thereof

Info

Publication number: CN111849446A
Application number: CN202010700030.9A
Authority: CN
Inventors: 李强; 张静; 史建民; 王耀国
Original assignee: Ningbo Fengcheng Advanced Energy Materials Research Institute
Current assignee: Ningbo Fengcheng Advanced Energy Materials Research Institute
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-10-30
Also published as: WO2022016711A1

Abstract

The application discloses a tackifying composition and a preparation method and application thereof, wherein the tackifying composition comprises water and montmorillonite/polymer nano material, and the hydrated particle size of the montmorillonite/polymer nano material is less than or equal to 100 nm; the mass percentage of the montmorillonite/polymer nano material in the tackifying composition is 1-10%, wherein the mass of the tackifying composition is calculated by the mass of water; the viscosity of the tackifying composition at 25 ℃ is 1000-20000 cp.

Description

Tackifying composition and preparation method and application thereof

Technical Field

The application relates to a tackifying composition and a preparation method and application thereof, belonging to the field of oil displacement materials.

Background

In real life and related industries, the energy crisis is becoming more severe, and therefore the importance and technical innovation of oil exploitation need to be further promoted. The analysis at the present stage shows that most oil reservoirs have relatively complex geological conditions, and the three-extraction oil displacement efficiency is seriously influenced. The construction of the heterogeneous oil reservoir has very obvious complexity and reservoir physical properties, and the great difference between the construction and the properties of the fluid seriously influences the oil reservoir development management and recovery ratio. Meanwhile, because the development effect of the heterogeneous oil reservoir is seriously influenced due to the neglect of water injection management in the oil development industry, various problems exist in the development process of the heterogeneous oil reservoir in China. Therefore, improving the development effect of heterogeneous oil reservoirs has become a general concern in the field of oil displacement.

The polymer flooding can generally improve the crude oil recovery of the heterogeneous oil reservoir, and the better the tackifying effect of the polymer is, the more beneficial the polymer flooding is. The factors that generally affect polymer flooding most include the degree and type of reservoir heterogeneity, viscosity ratio, wettability, and polymer properties. At present, a polymer flooding industrial product for heterogeneous oil reservoir Enhanced Oil Recovery (EOR) is generally partially hydrolyzed Polyacrylamide (PAM), and the tackifying effect is achieved mainly by means of the repulsion action of high molecular weight, ionic property on a molecular chain and strong polarity. However, the high molecular weight polymer is subjected to shear force, and the growth chain is easy to degrade, so that the viscosity is reduced, and the polymer flooding effect and the recovery rate are seriously influenced. Therefore, the apparent viscosity of the polymer is further enhanced, and the shearing resistance of the polymer in the injection process of the rock stratum of the heterogeneous oil reservoir is improved, so that the problem to be solved for exploiting the heterogeneous oil reservoir is already solved.

Application number 96115823.9 discloses a preparation method of high molecular weight anionic polyacrylamide, wherein alkali is added before use for polymerization, hydrolysis is carried out, the pH value of a reaction system is controlled, persulfate, water-soluble organic azo salt and a nitrogen triacrylate amine polybasic initiator are added to initiate homopolymerization of an acrylamide aqueous solution, and the ten thousand powdery anionic polyacrylamide with the molecular weight of 1500-2000 can be prepared. The method is simple and practical, and is easy for large-scale industrial production, and the prepared high molecular weight anionic polyacrylamide can be widely used for polymer flooding, solid-liquid separation, sewage treatment and drinking water treatment.

Application number 02133972.4 discloses a preparation method of a high-viscosity hydrophobic association polymer oil-displacing agent, which comprises the steps of preparing a hydrophobic association water-soluble polymer of Acrylamide (AM) -sodium acrylate (NaAA) -N-p-Butyl Phenyl Acrylamide (BPAM) into a certain concentration, adding a surfactant with a certain concentration, and uniformly stirring the mixture in a reaction kettle with a stirrer and a thermometer at the temperature of 25-40 ℃ to obtain the high-viscosity hydrophobic association polymer oil-displacing agent. Through the interaction of polymer molecules with hydrophobic groups and ionic groups of surfactant molecules and physical crosslinking effects such as entanglement and association between the hydrophobic groups among the polymer molecules and micelles of the surfactant with proper concentration, the polymer molecules form a gel network structure to show high tackifying effect.

Application No. CN201510601113.1 discloses a high-concentration acrylamide aqueous solution polymerization method, which adopts an aqueous solution free radical polymerization method, takes C1-C5 organic solvents as heat transfer solvents, water-soluble azo compounds as initiators, sodium formate and sodium hypophosphite as chain transfer agents, and carries out polymerization reaction at the temperature of 45-56 ℃ to synthesize polyacrylamide solution with the solid content of 70.1-79.3)% and the molecular weight of 0.61-6.54 ten thousand. The synthesized polyacrylamide has the advantages of high solid content, high dilution speed and the like, and is suitable for high-molecular co-emulsifier, dispersant, tackifier and the like.

The existing chemical flooding comprises polymer flooding, surfactant flooding, alkaline water flooding, foam flooding and the like. The polymer has high molecular weight and high viscosity, and is generally applied to heterogeneous oil reservoir conditions. However, when high molecular weight polymers are subjected to shear forces, long chain degradation occurs resulting in a significant decrease in viscosity. In addition, the conventional Hydrolyzed Polyacrylamide (HPAM) has the problems of serious thermal degradation, increased hydrolysis degree, combination and precipitation of high-valence ions and the like under the high-temperature and high-salt conditions, and the tackifying effect is poor. In addition, the preparation process of the hydrophobic association polymer is relatively complicated, the surfactant is expensive, the oil displacement cost is greatly increased, and the hydrophobic association polymer is difficult to be generally used.

As a novel oil displacement material, the two-dimensional nano material can provide a new research direction for the problems faced by heterogeneous oil reservoirs.

Disclosure of Invention

According to the first aspect of the application, a tackifying composition is provided, the tackifying composition is simple in treatment process, a simple self-polymerization/homopolymerization method is adopted to prepare a two-dimensional nano polymer, and montmorillonite is used as a cross-linking agent in the method, so that the material source is wide, and the price is low; the viscosity of the tackifying composition can reach more than 1000cp at 25 ℃, and the tackifying composition can be applied to the fields of oil displacement, sewage treatment, dye adsorption, heavy metal adsorption and the like.

The tackifying composition comprises water and montmorillonite/polymer nano material, wherein the hydration grain diameter of the montmorillonite/polymer nano material is less than or equal to 100 nm;

in the present application, the montmorillonite/polymer nanomaterial refers to a montmorillonite-modified polymer nanomaterial.

The mass percentage of the montmorillonite/polymer nano material in the tackifying composition is 1-10%, wherein the mass of the tackifying composition is calculated by the mass of water;

the viscosity of the tackifying composition at 25 ℃ is 1000-20000 cp.

Optionally, the viscosity of the viscosity increasing composition at 25 ℃ has a lower limit selected from 1000cp, 1255cp, 1300cp, 2050cp, 2052cp, 3000cp, 5000cp or 12000cp and an upper limit selected from 1255cp, 1300cp, 2050cp, 2052cp, 3000cp, 5000cp, 12000cp or 20000 cp.

Optionally, the hydrated particle size of the montmorillonite/polymer nano material is 40-70 nm.

In the application, the tackifying composition is colloidal, and the hydrated particle size is the particle size measured by adding the tackifying composition into deionized water to form a diluent with the mass concentration of montmorillonite/polymer nano material of 50-100 ppm.

Optionally, the polymer in the montmorillonite/polymer nanomaterial is an amide polymer;

The monomer of the amide polymer is a water-soluble polymer monomer, and the water-soluble polymer monomer is at least one of acrylamide, methacrylamide, N-methylolacrylamide or N, N-dimethylacrylamide;

the mass concentration of the amide polymer in the tackifying composition is 3-10%; preferably 3 to 5%.

The concentration of montmorillonite in the montmorillonite/polymer nano material in the tackifying composition is 1000-3000 ppm, wherein the mass of the tackifying composition is calculated by the mass of water.

Optionally, the tackifying composition further comprises a residual water-soluble polymer monomer, and the mass percentage content of the residual water-soluble polymer monomer in the tackifying composition is less than or equal to 0.1%.

In the present application, the residual water-soluble polymer monomer refers to water-soluble polymer monomer that has not reacted in the polymerization reaction.

Optionally, the adhesion-promoting composition further comprises an initiator;

the initiator is an inorganic peroxide initiator or a redox initiator;

the inorganic peroxide initiator is selected from potassium persulfate or ammonium persulfate;

the redox initiator is a potassium persulfate-sodium bisulfite system;

The concentration of the initiator in the tackifying composition is 300-1000 ppm.

In a second aspect of the present application, a method for preparing the adhesion-promoting composition described in any one of the above is provided, which at least comprises the following steps:

and carrying out polymerization reaction on reaction liquid containing montmorillonite, water and water-soluble polymer monomers to obtain the tackifying composition.

Optionally, the concentration of the montmorillonite in the reaction liquid is 1000-3000 ppm;

optionally, the mass concentration of the water-soluble polymer monomer in the reaction liquid is 3-10%, preferably 3-5%.

Optionally, the water is deionized water.

Optionally, the reaction solution further contains an initiator;

the concentration of the initiator in the reaction liquid is 300-1000 ppm.

The initiator is an inorganic peroxide initiator or a redox initiator;

the redox initiator is a potassium persulfate-sodium bisulfite system;

alternatively, specific conditions of the polymerization reaction include:

the reaction temperature is 40-80 ℃; preferably, the reaction temperature is 70-80 ℃;

the reaction time is 2-5 h.

Optionally, the lower limit of the reaction temperature is selected from 40 ℃, 45 ℃, 50 ℃, 60 ℃ or 70 ℃, and the upper limit of the reaction temperature is selected from 45 ℃, 50 ℃, 60 ℃, 70 ℃ or 80 ℃.

Optionally, the reaction solution containing montmorillonite, water and water-soluble polymer monomer is obtained by the following method:

adding montmorillonite into water, and mixing I to obtain a mixed solution I with the concentration of 1000-3000 ppm;

adding a water-soluble polymer monomer into water, and mixing II to obtain a mixed solution II with the concentration of 30000-60000 ppm;

and mixing III the mixed solution I and the mixed solution II, and deoxidizing to obtain the mixed solution.

Optionally, the removing oxygen specifically includes:

and (3) deoxidizing by introducing an inactive gas, wherein the inactive gas is selected from nitrogen or inert gas, and the deoxidizing time is preferably 30-60 min.

Optionally, the specific conditions of the mixing I include:

mixing the materials under the stirring condition at the temperature of 20-40 ℃;

the stirring speed is 200-400 r/min;

the stirring time is 0.5-1.5 h.

The reaction solution obtained by adopting the mixing scheme can prevent montmorillonite from agglomerating or swelling and crosslinking to become sticky and influence the late grafting reaction.

In an optional embodiment, the reaction solution further comprises the initiator, the initiator and water are prepared into a mixed solution IV, and after oxygen removal, the mixed solution IV is added into the mixed solution III after oxygen removal to obtain the reaction solution; optionally, the mixed solution IV is deaerated by introducing an inactive gas, wherein the inactive gas is selected from nitrogen or an inert gas, and the deaerating time is preferably 10-20 min.

In a third aspect of the present application, an application of at least one of the adhesion-promoting composition described in any one of the above and the adhesion-promoting composition prepared by any one of the above preparation methods in oil displacement, sewage treatment, fuel adsorption, and heavy metal adsorption is provided.

In an optional embodiment, the viscosity increasing composition is mixed with water to be used as an oil displacement agent to displace oil from an oil reservoir;

in the oil displacement agent, the content of the tackifying composition is 10-50 ppm.

In another alternative embodiment, the viscosified composition is blended with a polymer oil displacement agent to displace an oil reservoir;

the mass ratio of the tackifying composition to the polymer oil-displacing agent is 1: 8 to 20.

Optionally, the polymer oil displacement agent is selected from at least one of a polymer oil displacement agent provided by Henan Zhengyuan environmental protection GmbH, a polymer oil displacement agent provided by Mediterranean oil, and a polymer oil displacement agent provided by Mediterranean oil.

Optionally, the reservoir is a heterogeneous reservoir.

In the present application, the heterogeneous oil reservoir means that the oil reservoir space has non-uniform concentration gradient of crude oil components and crude oil physical density gradient no matter in the longitudinal direction or in the transverse direction.

The beneficial effects that this application can produce include:

(1) The tackifying composition has simple treatment process, can prepare the two-dimensional nano polymer by adopting a simple self-polymerization/homopolymerization method, and has wide material source and low price by taking montmorillonite as a cross-linking agent;

(2) the tackifying composition can be applied to the fields of oil displacement, sewage treatment, dye adsorption, heavy metal adsorption and the like;

(3) on one hand, the hydration grain diameter of the montmorillonite/polymer nano material in the tackifying composition is less than 100nm, and when the composition is applied to oil displacement, the problems of pore throat blockage and injectability are relieved; on the other hand, the lamellar structure of the montmorillonite relieves the shear stress to a certain extent and increases the viscosity of the polymer; thirdly, the low-price montmorillonite not only increases the viscosity of the polymer, but also reduces the usage amount of polymer monomers (water-soluble polymer monomers, polyacrylamide acrylamide, methacrylamide, N-methylolacrylamide, N or N-dimethylacrylamide and the like) with relatively high cost. The tackifying composition has better temperature resistance, salt resistance and stability, so that the tackifying composition can keep higher viscosity at higher temperature, which is beneficial to heterogeneous oil reservoir conditions.

Drawings

FIG. 1 is an infrared spectrum of the adhesion promoting compositions provided in examples 1-5.

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.

Wherein the montmorillonite is obtained from Nanocor company and has the model of LI-S;

zhengjia polymer was purchased from Henan Zhengjia energy environmental protection, Inc.; oil agent, polymer oil-displacing agent provided by Mediterranean oil, and polymer oil-displacing agent provided by Mediterranean oil

The mediterranean oil polymer was purchased from mediterranean oil corporation;

medium petrochemical polymers are purchased from medium petrochemical companies;

unless otherwise specified, the reactions in the examples were all carried out at room temperature.

The analysis method in the examples of the present application is as follows:

particle size testing was performed using a Malvern Zetasizer Nano ZS90 Nano particle size potentiometer.

The infrared test was performed using a Nicolet iS50 Fourier transform infrared spectrometer (available from Saimer Feishell science Co., Ltd.).

Potentiometric measurements were performed using a Malvern Zetasizer Nano ZS90 Nano particle size potentiometer.

The method for calculating the monomer residual rate (called residual sheet for short) in the embodiment of the application comprises the following steps: ultraviolet spectroscopy.

Ultraviolet spectra were measured using an ultraviolet-visible spectrophotometer (available from shimadzu instruments, inc.).

Example 1 Effect of reaction temperature on MTP viscosity

Examples 1 to 1

Mixing 2.0g of montmorillonite and 800mL of deionized water in a 1L beaker, and mechanically stirring for 1h at the rotating speed of 250r/min to fully dissolve the montmorillonite and the deionized water to obtain a mixed solution I; dissolving 40g of acrylamide monomer in 80mL of deionized water to obtain a mixed solution II; taking 0.4g of initiator potassium persulfate, and dissolving in 20mL of deionized water to obtain a mixed solution IV; mixing 800mL of mixed solution I and 80mL of mixed solution II in a 2L flask, and supplementing 100mL of deionized water to obtain mixed solution III; introducing N into the mixed solution III₂Deoxidizing for 30min, and introducing N into the mixed solution IV₂Deoxidizing for 15 min; preserving the heat of the deoxidized mixed liquid III in a 45 ℃ oil bath pot, adding the deoxidized mixed liquid IV to start reaction when the temperature of a thermometer in the mixed liquid III reaches 40 ℃; the reaction time was 3 hours from the start to the end of the reaction, and the reaction system obtained after the end of the reaction was the adhesion promoting composition (MTP) and was recorded as sample 1-1.

Examples 1-2 to 1-5 were prepared in substantially the same manner as in example 1-1, except that the oil bath temperature in example 1-2 was 50 ℃, the oil bath temperature in example 1-3 was 60 ℃, the oil bath temperature in example 1-4 was 70 ℃, the oil bath temperature in example 1-5 was 80 ℃, and the tackifier compositions obtained in example 1-2 to example 1-5 were designated as sample 1-2, sample 1-3, sample 1-4, and sample 1-5, respectively.

TABLE 1 viscosity for each MTP sample in example 1

As can be seen from table 1, as the reaction temperature increased, the viscosity of the MTP sample at room temperature was lower; the MTP product with the viscosity of more than 2000cp at room temperature can be obtained at the reaction temperature of 45-80 ℃, and the MTP product with the viscosity of more than 2000cp at room temperature can be obtained at the reaction temperature of 70-80 ℃, so that the method is more favorable for discharging the product and cleaning reactors such as flasks and the like.

Examples 2-1 to 2-3 were prepared in substantially the same manner as in examples 1-5, except that the weight of montmorillonite in example 2-1 was 1.0g, the weight of montmorillonite in example 2-2 was 1.5g, the weight of montmorillonite in example 2-3 was 2.5g, and the tackifying compositions obtained in examples 2-1 to 2-3 were designated as sample 2-1, sample 2-2, and sample 2-3 in this order.

TABLE 2 viscosity for each MTP sample

In table 2, MT concentration is the mass of montmorillonite/the mass of deionized water in the viscosified composition;

as can be seen from Table 2, the viscosity of MTP increases rapidly with the increase of MT content in the reaction system, the viscosity of the obtained tackifying composition can meet the use requirement when the concentration of montmorillonite is 1000-2500 ppm, and when the input concentration of MT is 2000ppm, the viscosity of the obtained tackifying composition can be a product with the viscosity of more than 2000cp, and the cleaning of reactors such as flasks and the like is facilitated.

Example 3 Effect of monomer content on MTP viscosity

Examples 3-1 to 3-4 were prepared in substantially the same manner as in examples 1 to 5, except that the mass of the acrylamide monomer in example 3-1 was 10g, the mass of the acrylamide monomer in example 3-2 was 30g, the mass of the acrylamide monomer in example 3-3 was 50g, the mass of the acrylamide monomer in example 3-4 was 80g, and the mass of the acrylamide monomer in example 3-5 was 100 g:

TABLE 3 viscosity for each MTP sample

The AM content in table 3 is 100% by mass of the polymer monomer/deionized water in the adhesion promoting composition;

as can be seen from table 3, the viscosity of the MTP increased with increasing AM content; when the content of AM is 3-10%, a tackifying composition with the viscosity of over 1000cp can be obtained; when the content of AM is 3-5%, the tackifying composition with the viscosity of over 1000cp can be obtained, and reactors such as a flask and the like are convenient to discharge and clean.

Example 4 Effect of reaction time on MTP residual sheets

The preparation methods of examples 4-1 to 4-4 are substantially the same as those of examples 1 to 5, except that the reaction time in example 4-1 is 2 hours, the reaction time in example 4-2 is 4 hours, the reaction time in example 4-3 is 5 hours, and the reaction time in example 4-4 is 6 hours.

The polymer monomer residual rate test is carried out on the tackifying composition samples prepared in the embodiments 4-1 to 4-4, and the specific test method comprises the following steps: 1mL of each of the thickening compositions obtained in examples was diluted with 9mL of analytically pure absolute ethanol, and the white flocculent precipitate was removed and centrifuged at 4000r/min for 15 min. And (3) taking 1mL of the supernatant, diluting with 9mL of a hydroalcoholic solution (the volume ratio of absolute ethyl alcohol to water is 9: 1), performing ultraviolet spectrum test by using an ultraviolet-visible spectrophotometer, and comparing the test ultraviolet spectrum curve with the residual standard curve to obtain the spectrum curve concentration close to the standard curve. Approximate standard curve concentration value/total monomer concentration of the diluent ═ content of residual monomer (abbreviated as residual monomer). The corresponding list of each example is shown in table 4. Wherein, the laboratory test standard for determining the residual monomer content (ultraviolet method):

reagent: absolute ethyl alcohol, deionized water and a sample to be detected;

the instrument comprises the following steps: ultraviolet spectrophotometer, centrifuge, volumetric flask 1L, 500mL, centrifuge tube 50mL, pipette 1mL, 10mL, cuvette

Preparation of Acrylamide (AM) standard solution:

1. ethanol water (9: 1) mixed solution standard solution: 100mL of deionized water solution was measured out of a 100mL volumetric flask, transferred to a 1000mL volumetric flask, added with 900mL of ethanol, and shaken well for use.

2.1mg/mL (1000ppm) acrylamide standard: weighing 0.500g of acrylamide powder sample, adding 500mL of the ethanol-water mixed solution standard solution, and shaking up for later use.

3. The above 1mg/ml AM solution samples were diluted to 1ppm, 2ppm, 3ppm, 4ppm, 5ppm in this order. The ultraviolet absorption peaks of the above solutions were measured respectively as the standard curve of the residual sheet.

TABLE 4 corresponding residual amounts for each MTP sample

As can be seen from Table 4, the monomer residue rate can be controlled to be not more than 2% within 2-6 h of reaction time; when the reaction temperature is 3-5 h, the residual rate of the monomers can be ensured to meet the requirement, and the energy consumption can be saved.

Example 5 characterization of the tackifying compositions obtained in examples 1 to 4

The samples of the tackified compositions obtained in examples 1-4 were tested using a Fourier transform infrared spectrometer, typically representative of the samples provided in examples 1-5, as shown in FIG. 1, according to the sample infrared spectrum, except at 1002.65cm^-1The vibration peak of the montmorillonite is 3340.67cm outside the Si-O stretching vibration peak^-1A stretching vibration absorption peak of amide N-H bond exists; at 3195.98cm^-1In which an acyl group and an amino group are present; at 1119.82cm^-1An absorption peak at which an amide carbonyl appears, indicating the presence of a carbonyl group in the sample; at 1657.34cm^-1And the expansion vibration absorption peak of the amide group appears, which indicates that the MTP nano composite material sample contains MT and PAM. In addition, according to the MTP infrared spectrum, the Si-O stretching vibration peak of the montmorillonite at 1000.38 is stronger than that of the MTP infrared spectrum at 1002.65cm ^-1And Si-O stretching vibration peak shows that the montmorillonite is coated by acrylamide. Other embodiments provide a sample infrared spectrum similar to that of this embodiment with the same characteristics.

Diluting each sample to 75ppm by using deionized water to obtain a sample to be tested, and testing the particle size of the tackifying composition sample obtained in the embodiment 1-4; the test results are shown in table 5;

TABLE 5 sample parameters obtained in the examples

Example 6 Performance testing of the tackifying compositions obtained in examples 1 to 4

(1) Testing of temperature and salt resistance

Respectively diluting the tackifying compositions obtained in the embodiments 1 to 4 in water with different mineralization degrees to obtain test samples with the concentration of the tackifying compositions being 50 ppm;

and (3) placing the test samples under the conditions of different mineralization degrees and temperatures for 30 days, and testing the temperature resistance and salt tolerance of the samples, wherein the test results are shown in table 6.

Table 6 table of stability parameters for each test sample

Wherein "1 w NaCl" means that the concentration of NaCl in the water used for dilution is 10000ppm, and "2.5 w NaCl +1200CaCl₂"means that the concentration of NaCl in the water used for dilution is 25000ppm and CaCl₂With a concentration of 1200ppm, "victory BN field formation water (5W)" is meant that the water used for dilution is taken from the victory BN field bottom water, with a NaCl concentration of 50000 ppm.

As is clear from Table 6, the aqueous dispersion of the thickening composition provided in the examples of the present application has good temperature resistance and salt tolerance (5w mineralization, 80 ℃ C.), and the stability is as high as 30d or more.

(2) And (3) testing the tackifying performance:

the tackifying compositions provided in the examples are mixed with different amounts of good polymers to obtain test samples with different concentrations, and the viscosity of each test sample at 70 ℃ is tested, wherein the viscosity is typically represented by the samples with different concentrations provided in examples 1 to 5, and the test results are shown in table 7;

wherein, the tackifying ratio is (mixture viscosity-excellent polymer self-viscosity)/excellent polymer self-viscosity;

TABLE 770 ℃ evaluation of the thickening Effect of MTP at different concentrations on an Normal good Polymer (ZJ 1)

In other examples, the thickening ratio is 10 to 1000% when the concentration is 10ppm or more.

The viscosified composition provided in each example was mixed with different polymers and water of different degrees of mineralization to obtain a test sample having a viscosified composition concentration of 100ppm, and the viscosity of each test sample was tested, wherein the viscosity of each test sample is represented by the samples provided in examples 1-5, and the test results are shown in table 8;

wherein, the tackifying ratio is (mixture viscosity-polymer self viscosity)/polymer self viscosity;

TABLE 8100 ppm MTP evaluation of viscosifying Effect on different polymers

Wherein, 1w NaCl +200CaCl₂"means that the concentration of NaCl in the used water is 10000ppm and CaCl₂The concentration is 200ppm, and the "7000 ppm divalent salt ion" means that the concentration of the divalent salt ion in the water used is 7000ppm, and the "2.5 wNaCl +1200CaCl₂"means that the concentration of NaCl in the used water is 25000ppm and CaCl₂The concentration was 1200 ppm.

The MTPs provided in examples 1-5 all had varying degrees of viscosifying effect on different polymers, up to 326%; the optimum use concentration is 100 ppm.

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

1. The tackifying composition is characterized by comprising water and montmorillonite/polymer nano material, wherein the hydrated particle size of the montmorillonite/polymer nano material is less than or equal to 100 nm;

The viscosity of the tackifying composition at 25 ℃ is 1000-20000 cp.

2. The adhesion-promoting composition of claim 1, wherein the hydrated particle size of the montmorillonite/polymer nanomaterial is 40-70 nm;

preferably, the polymer in the montmorillonite/polymer nano material is an amide polymer;

the mass concentration of the amide polymer in the tackifying composition is 3-10%;

the concentration of montmorillonite in the montmorillonite/polymer nano material in the tackifying composition is 1000-3000 ppm;

preferably, the tackifying composition further comprises residual water-soluble polymer monomers, and the mass percentage content of the residual water-soluble polymer monomers in the tackifying composition is less than or equal to 0.1%.

3. The adhesion-promoting composition of claim 1, further comprising an initiator;

the initiator is an inorganic peroxide initiator or a redox initiator;

The redox initiator is a potassium persulfate-sodium bisulfite system;

4. A process for the preparation of a tackifying composition according to any one of claims 1 to 3, characterized by comprising at least the following steps:

5. The method for preparing the adhesion-promoting composition according to claim 4, wherein the concentration of the montmorillonite in the reaction solution is 1000 to 3000 ppm;

the mass concentration of the water-soluble polymer monomer in the reaction liquid is 3-10%;

preferably, the reaction solution further contains an initiator;

the concentration of the initiator in the reaction liquid is 300-1000 ppm;

preferably, the specific conditions of the polymerization reaction include:

the reaction temperature is 40-80 ℃;

the reaction time is 2-5 h;

preferably, the reaction solution containing montmorillonite, water and water-soluble polymer monomer is obtained by the following method:

adding a water-soluble polymer monomer into water, and mixing II to obtain a mixed solution II with the concentration of 300000-600000 ppm;

And mixing III the mixed solution I and the mixed solution II, and deoxidizing to obtain the reaction solution.

6. The method of claim 5, wherein the specific conditions of mixing I comprise:

the stirring speed is 200-400 r/min;

the stirring time is 0.5-1.5 h.

7. Use of at least one of the adhesion-promoting composition of any one of claims 1 to 3 and the adhesion-promoting composition prepared by the preparation method of any one of claims 4 to 6 in oil displacement, sewage treatment, fuel adsorption and heavy metal adsorption.

8. The use of claim 7, wherein the viscosified composition is mixed with water as an oil displacement agent to displace oil from an oil reservoir;

in the oil displacement agent, the content of the tackifying composition is 10-100 ppm.

9. The use of claim 8, wherein the viscosified composition, the polymer oil displacement agent, and water are mixed to displace oil from an oil reservoir;

10. The use of claim 8, wherein the reservoir is a heterogeneous reservoir.