CN108219009B - Modified nano-cellulose and preparation method and application thereof - Google Patents
Modified nano-cellulose and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a modified nano-cellulose and a preparation method and application thereof. The preparation method of the modified nano-cellulose comprises the following steps: (1) oxidizing the nano-cellulose by using sodium periodate to obtain aldehyde nano-cellulose; (2) and reacting the aldehyde nanocellulose with polyethyleneimine and sodium borohydride in sequence to obtain the compound. The modified nano-cellulose prepared by the invention has good dispersion performance and high-temperature stability, and can improve the rigidity of polymer molecules and form a good polymer intermolecular network structure through strong interaction between the modified nano-cellulose and a polymer, thereby generating excellent performances of temperature resistance, salt resistance, aging resistance and the like. The modified nano-cellulose prepared by the method has a certain oil washing effect.
Description
Technical Field
The invention relates to a modified nano-cellulose and a preparation method and application thereof, belonging to the technical field of oilfield chemistry.
Background
The chemical flooding technology is one of the main technical measures for improving the recovery ratio of crude oil in China, wherein a water-soluble polymer is one of key chemical agents for implementing chemical flooding, and the polymer flooding technology takes the measures of improving the viscosity of an injection displacement phase and improving the mobility ratio of oil-water flow in oil reservoir fluid as means, so that the aims of expanding the coverage degree and improving the recovery ratio of the oil reservoir are 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. The partially Hydrolyzed Polyacrylamide (HPAM) is the most commonly used oil displacement polymer in an oil field, and the application of the HPAM has certain technical weaknesses in a high-temperature and high-salt oil reservoir, for example, the salt sensitivity effect is obvious, and the polymer is Ca-sensitive2+、Mg2+The ions are particularly sensitive; the temperature resistance is poor, and the tackifying performance at high temperature is reduced sharply; the long-term stability is poor, and hydrolysis, oxidative degradation, mechanical degradation and the like are easy to occur in the oil reservoir migration process, so that the solution viscosity is reduced, and the oil displacement effect is poor. 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 saline solution at high temperature are mainly as follows: (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 in a saline solution and at high temperature, and prevent the viscosity from being greatly reduced. However, the introduction of too much functional monomer increases the cost of the product, and on the other hand, the functional monomer has poor polymerization activity compared with acrylamide, thereby resulting in lower molecular weight of the copolymer and poor tackifying performance, which increases the use concentration of the product.
The nano-cellulose is nano-cellulose extracted from natural cellulose fibers, has the characteristics of nano-particles, has certain unique strength and chemical properties, and has wide application prospect. Therefore, the nano-cellulose can be modified and applied to oil displacing polymers.
Disclosure of Invention
The invention aims to provide a modified nano-cellulose and a preparation method thereof, wherein the modified nano-cellulose with higher amino density on the surface is obtained by reacting nano-cellulose with polyethyleneimine; the modified nano-cellulose can be introduced into the synthesis of a conventional acrylamide polymer, and has strong interaction with polymer molecules, so that the effects of improving the rigidity of the polymer molecules, improving the high-temperature stability of side groups in the polymer molecules, constructing networks among the polymer molecules and the like are achieved.
The preparation method of the modified nano-cellulose provided by the invention comprises the following steps:
(1) oxidizing the nano-cellulose by using sodium periodate to obtain aldehyde nano-cellulose;
(2) and reacting the aldehyde nanocellulose with polyethyleneimine and sodium borohydride in sequence to obtain the modified nanocellulose.
In the above preparation method, in the step (1), the oxidation conditions are as follows:
the pH value is 2-4;
the temperature is 30-60 ℃;
the time is 1-20 h;
the reaction is carried out in the dark.
In the above preparation method, in the step (1), the oxidation is carried out in water;
in the mixed solution of the sodium periodate and the nano-cellulose, the mass volume concentration of the nano-cellulose is 1-50 g/L;
the mass ratio of the sodium periodate to the nano-cellulose is 0.1-2: 1;
the particle size of the nano-cellulose is 50-800 nm.
In the above preparation method, after the oxidation is completed, the method further comprises the step of adding ethylene glycol to the system to remove unreacted sodium periodate.
In the preparation method, in the step (2), the polyethyleneimine and the sodium borohydride are added into the aqueous dispersion of the aldehyde nanocellulose to carry out the reaction;
in the aqueous dispersion of the aldehyde nanocellulose, the mass volume concentration of the aldehyde nanocellulose is 1-10 g/L.
In the preparation method, in the step (2), the reaction conditions of the aldehyde nanocellulose and the polyethyleneimine are as follows:
the temperature is 20-50 ℃;
the time is 0.5-12 h.
In the preparation method, in the step (2), the reaction conditions of the reaction product of the aldehyde nanocellulose and the polyethyleneimine and the sodium borohydride are as follows:
the temperature is 20-50 ℃;
the time is 2-3 h.
In the preparation method, in the step (2), the molecular weight of the polyethyleneimine is 300-6000;
the mass ratio of the polyethyleneimine to the aldehyde nanocellulose is 0.05-3: 1;
in the reaction system, the mass volume concentration of the sodium borohydride is 5-10 g/L.
In the above preparation method, in the step (2), after the reaction is completed, the product of the reaction is dialyzed in deionized water three times by a dialysis bag, and then washed and dried.
The modified nano-cellulose prepared by the method can be used for improving the temperature resistance and salt resistance of acrylamide polymers, and the modified nano-cellulose is added in the polymerization process of conventional acrylamide polymers. The method can be specifically carried out by the following steps: mixing modified nano-cellulose, a water-soluble monomer and deionized water for reaction, controlling the temperature within 10 ℃ and the pH within 4-8, stirring and introducing nitrogen until the modified nano-cellulose is completely dispersed; and then sequentially adding disodium ethylene diamine tetraacetate, ammonium ceric nitrate, tetramethylethylenediamine, azodiisobutyramidine hydrochloride, tert-butyl hydroperoxide and hydrogen peroxide, reacting for 1-10 hours, raising the temperature to 60 ℃, reacting for 0.5-5 hours, adding NaOH solution to adjust the pH value of the system to 8-9, aging at constant temperature for 2-3 hours, drying and crushing the product to obtain a polymer product.
The invention has the following beneficial effects:
the modified nano-cellulose prepared by the invention has good dispersion performance and high-temperature stability, and can improve the rigidity of polymer molecules and form a good polymer intermolecular network structure through strong interaction between the modified nano-cellulose and a polymer, thereby generating excellent performances of temperature resistance, salt resistance, aging resistance and the like.
The modified nano-cellulose prepared by the method has a certain oil washing effect.
Drawings
FIG. 1 shows the results of oil displacement experiments using the polymer of example 1.
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 preparation of modified nanocellulose
Adding sodium periodate into the nano-cellulose dispersion, adjusting the pH value of the solution to 3.5, and reacting for 12 hours at 40 ℃ in a dark place; adding ethylene glycol (the concentration is 50g/L) to remove unreacted sodium periodate; dialyzing the product for three times to obtain the aldehyde group nano-cellulose. Adding polyethyleneimine into the water dispersion of the aldehyde nanocellulose, and stirring and reacting for 6 hours at 35 ℃; adding sodium borohydride and reacting for 3 h; dialyzing the product for three times, washing and drying to obtain the modified nano-cellulose.
In the method, the particle size of the nano-cellulose is 300-500 nm, the mass volume concentration of the nano-cellulose in the mixed solution of the sodium periodate and the nano-cellulose is 10g/L, and the mass volume concentration of the sodium periodate is 6 g/L; the concentration of the aldehyde nanocellulose is 5 g/L; the molecular weight of the polyethyleneimine is 600, the concentration of the polyethyleneimine is 5g/L, and the concentration of sodium borohydride is 5 g/L.
The modified nanocellulose prepared by the embodiment is used for preparing a temperature-resistant and salt-tolerant oil-displacing polymer:
application examples 1,
Adding 0.5g of modified nano-cellulose, 30g of acrylamide, 20g of 2-acrylamide-2-methylpropanesulfonic acid sodium salt and 150g of deionized water into a three-neck glass bottle provided with a stirrer, a nitrogen introducing pipe and a thermometer, wherein the temperature is 8 ℃, the pH value is 6.5, stirring and introducing nitrogen until the modified nano-cellulose is completely dispersed, then sequentially adding 1.5mg of disodium ethylene diamine tetraacetate, 0.4mg of ceric ammonium nitrate, 0.1mg of tetramethylethylenediamine, 3mg of azodiisobutyramidine hydrochloride, 0.5mg of tert-butyl hydroperoxide and 0.2mg of hydrogen peroxide, reacting for 3 hours, raising the temperature to 60 ℃, reacting for 1 hour, adding a NaOH solution to adjust the pH value of the system to 8.8, aging at constant temperature for 2 hours, drying and crushing the product to obtain a polymer product.
Application examples 2,
The same as in application example 1, except that the nanocellulose in the step (1) has a particle size of 150 to 350nm and a concentration of 15 g.L-1。
Application examples 3,
The same as in application example 1, except that the polyethyleneimine used in step (1) had a molecular weight of 1800 and a concentration of 3 g/L.
Application examples 4,
The same as in application example 1, except that the amount of the modified nanocellulose added in step (2) was 2 g.
Application examples 5,
The same as in application example 1, except that in step (2), acrylamide was 40g, sodium 2-acrylamido-2-methylpropanesulfonate was 10g, and deionized water was 100 g.
Application examples 6,
The same as in application example 1, except that the monomers in step (2) were 30g of acrylamide, 10g of sodium 2-acrylamido-2-methylpropanesulfonate and 10g of vinylpyrrolidone.
Application examples 7,
The same as in application example 1, except that the monomers in step (2) were 30g of acrylamide, 10g of sodium acrylate and 10g of vinylpyrrolidone.
Application examples 8,
The same as in application example 1, except that disodium ethylenediaminetetraacetate in step (2) was 2 mg.
Application examples 9,
The same as in application example 1, except that the amount of cerium ammonium nitrate in step (2) was 0.5 mg.
Application examples 10,
The same as in application example 1, except that azodiisobutyamidine hydrochloride in step (2) was 5 mg.
Application examples 11,
The same as in application example 1, except that 0.7mg of t-butyl hydroperoxide and 0.15mg of hydrogen peroxide were used in step (2).
Application examples 12,
The same applies to example 1, except that in step (2) the reaction pH was 5.7, the reaction time was 4 hours at 10 ℃ and 3 hours at 60 ℃.
Comparative examples 1,
The same applies as in application example 1, except that no modified nanocellulose was added.
Comparative examples 2,
Comparative example 2 is an oil displacing polymer (BHKY-3, Tianjin Bohong petrochemical Co., Ltd.) used in a certain oil field.
Performance evaluation of each application example and comparative product:
preparing a polymer solution with the polymer concentration of 0.2% by using mineralized water, stirring for 20s by using a Warring stirrer at 1 gear, aging for 90 days at 90 ℃, testing the viscosity of the polymer solution before and after shearing and before and after aging by using a Brookfield DV3T type viscometer, wherein the testing temperature is 90 ℃, and the testing rotating speed is 6 r/min. The composition of the mineralized water is shown in Table 1, the evaluation results of the shear resistance are shown in Table 2, and the evaluation results of the high-temperature aging resistance are shown in Table 3.
The results in table 2 show that the introduction of the modified nanocellulose can significantly improve the tackifying performance of the polymer, and more importantly, the sample prepared by the surface initiation of the nanocellulose has excellent shear degradation resistance, and the viscosity retention rate after shearing is about 80% which is more than ten percent of that of the on-site oil-displacing polymer.
As can be seen from the results in Table 3, the polymer sample added with the modified nanocellulose has good high-temperature long-term stability, and the viscosity retention rate of the sample is over 60% after 90-day aging.
TABLE 1 mineralized Water composition
TABLE 2 evaluation results of shear resistance
| Sample numbering | Before shearing (mPas) | After shearing (mPas) | Viscosity retention rate |
| Application example 1 | 25.3 | 19.8 | 78.3％ |
| Application example 2 | 22.2 | 17.5 | 78.8％ |
| Application example 3 | 26.7 | 20.6 | 77.2％ |
| Application example 4 | 23.5 | 19.4 | 82.6％ |
| Application example 5 | 22.8 | 17.9 | 78.5％ |
| Application example 6 | 20.5 | 16.6 | 81.0％ |
| Application example 7 | 17.3 | 13.2 | 76.3％ |
| Application example 8 | 28.5 | 22.1 | 77.5％ |
| Application example 9 | 22.7 | 17.9 | 78.8％ |
| Application example 10 | 25.8 | 20.4 | 79.1％ |
| Application example 11 | 27.4 | 22.2 | 81.0％ |
| Application example 12 | 21.6 | 16.9 | 78.2％ |
| Comparative example 1 | 14.6 | 9.2 | 63.0％ |
| Comparative example 2 | 20.4 | 13.9 | 68.1％ |
TABLE 3 evaluation results of high-temperature aging resistance
The polymer prepared in application example 1 is adopted to carry out an indoor experiment for improving the recovery ratio, the prepared polymer is prepared into 0.2 percent polymer solution by mineralized water, and the solution is injected into a one-dimensional sand filling model (the cross section area of a sand filling pipe is 4.91 cm)2Length of 30cm), original oil saturation of 75%, water-driven to water content of 98%, (shear rate of crude oil at 90 deg.C for 7.34s-1Viscosity of 61.5 mPas) under the condition) is 1mL/min, after injecting 0.35PV polymer aqueous solution, water is continuously used for driving until the water content reaches 98 percent, the measured recovery ratio is improved by 18.5 percent, and the recovery ratio curve and the water content curve are shown in figure 1.
Claims (5)
1. The application of the modified nano-cellulose in preparing a temperature-resistant and salt-tolerant oil-displacing polymer;
adding modified nano-cellulose in the polymerization process of the oil displacing polymer, wherein the adopted initiation system is a cerium salt and redox initiation system;
the oil displacing polymer is an acrylamide polymer;
the preparation method of the modified nano-cellulose comprises the following steps:
(1) oxidizing the nano-cellulose by using sodium periodate to obtain aldehyde nano-cellulose;
the oxidation is carried out in water;
in the mixed solution of the sodium periodate and the nano-cellulose, the mass volume concentration of the nano-cellulose is 1-50 g/L;
the mass ratio of the sodium periodate to the nano-cellulose is 0.1-2: 1;
the particle size of the nano-cellulose is 50-800 nm;
(2) reacting the aldehyde nanocellulose with polyethyleneimine and sodium borohydride in sequence to obtain the modified nanocellulose;
the molecular weight of the polyethyleneimine is 300-6000;
the mass ratio of the polyethyleneimine to the aldehyde nanocellulose is 0.05-3: 1;
in the reaction system, the mass volume concentration of the sodium borohydride is 5-10 g/L.
2. Use according to claim 1, characterized in that: in the step (1), the oxidation conditions are as follows:
the pH value is 2-4;
the temperature is 30-60 DEG CoC；
The time is 1-20 h;
the reaction is carried out in the dark.
3. Use according to claim 1 or 2, characterized in that: in the step (2), the polyethyleneimine and the sodium borohydride are added into the aqueous dispersion of the aldehyde nanocellulose to carry out the reaction;
in the aqueous dispersion of the aldehyde nanocellulose, the mass volume concentration of the aldehyde nanocellulose is 1-10 g/L.
4. Use according to claim 3, characterized in that: in the step (2), the reaction conditions of the aldehyde nanocellulose and the polyethyleneimine are as follows:
the temperature is 20-50 deg.CoC；
The time is 0.5-12 h.
5. Use according to claim 4, characterized in that: in the step (2), the reaction conditions of the reaction product of the aldehyde nanocellulose and the polyethyleneimine and the sodium borohydride are as follows:
the temperature is 20-50 deg.CoC；
The time is 2-3 h.
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