CN116083066B - Composite flooding composition of two-dimensional nano particles and preparation method of two-dimensional nano particles - Google Patents
Composite flooding composition of two-dimensional nano particles and preparation method of two-dimensional nano particles Download PDFInfo
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- 229910021380 Manganese Chloride Inorganic materials 0.000 description 1
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K8/584—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 surfactants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
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- Oil, Petroleum & Natural Gas (AREA)
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- Organic Chemistry (AREA)
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Abstract
The invention provides a two-dimensional nanoparticle composite flooding composition and a preparation method thereof, wherein the two-dimensional nanoparticle composite flooding composition comprises, by mass, 0.01-0.05 wt% of two-dimensional nanoparticles, 0.05-0.50 wt% of surfactant, 0.05-0.30 wt% of polymer and the balance of water. The synthesis method of the nano material provided by the invention realizes the controllable synthesis of the two-dimensional nano material, and the preparation method is relatively simple and convenient and has strong practicability; the emulsion containing the two-dimensional nano material provided by the invention can greatly improve the stability and viscosity of the emulsion; the composite flooding composition containing the two-dimensional nano particles has the effects of strong emulsification and expansion of sweep volume, and the parallel core flooding experiment improves the recovery ratio by more than 30%, so that the composite flooding composition has a wide application prospect in medium-low permeability reservoirs.
Description
Technical Field
The invention belongs to the technical field of petroleum development, and particularly relates to a two-dimensional nanoparticle composite flooding composition and a preparation method of two-dimensional nanoparticles.
Background
As the oil field gradually enters the high water content and extra-high water content period, the stable yield difficulty gradually becomes larger, and the development contradiction is gradually highlighted, so that further improvement of the recovery ratio is becoming a very urgent work. Chemical flooding enhanced recovery technology represented by ternary complex flooding makes an important contribution to stable production of domestic crude oil. The ternary composite oil displacement technology is a new tertiary oil recovery technology developed in the 80 s of the last century, and is characterized in that the volume is enlarged, the oil washing efficiency is improved, and the recovery ratio is greatly improved through the synergistic effect among alkali, surfactant and polymer. The alkali plays a key role in the ternary complex flooding process, and the alkali reacts with acidic components in crude oil to generate saponified matters, so that the emulsification effect and stability are improved, and the ternary complex flooding agent is one of key action mechanisms of complex flooding. The field test also shows that the high-viscosity emulsion can play a role in expanding the sweep volume in the composite flooding process, and the planar and longitudinal sweep degree of the composite flooding after the high-viscosity emulsion is generated can be improved.
At present, the compound flooding technology of the Daqing integral sandstone oil reservoir is gradually mature, the popularization and application of the chemical flooding technology show the trend of expanding from a high-permeability oil reservoir to a complex medium-low permeability oil reservoir, and a series of problems to be solved are generated in the popularization and application. On one hand, the medium-low permeability reservoir has complex conditions and stronger heterogeneity, and affects the sweep efficiency of a chemical flooding system. On the other hand, the use of alkali causes a series of negative problems, such as alkali consumption, scaling, reservoir damage and the like, which affect the injection and migration of an oil displacement system in a medium-low permeability reservoir, greatly increase the economic cost and are not suitable for the application of the medium-low permeability reservoir. The development of the high-efficiency alkali-free oil displacement system with the function of expanding the swept volume becomes the key attack direction of chemical flooding.
The prior art scheme is to develop a heterogeneous composite flooding technology on the basis of ternary composite flooding. Well petrifaction Sun Huanquan and the like disclose a heterogeneous composite oil displacement system of pre-crosslinked gel particles, polymers and surfactants (well pattern adjustment after polymer flooding, heterogeneous composite flooding lead test scheme and mine field application, oil and gas geology and recovery ratio, 2014). After polymer flooding, a heterogeneous composite oil displacement system prepared from a viscoelastic particle oil displacement agent B-PPG, a polymer and a surfactant is injected and developed, so that a good application effect is achieved, the comprehensive water content of an oil well is reduced by 18.5%, and the cumulative yield of crude oil is increased by 4.3 multiplied by 104t. Patent CN 112795374A discloses a temperature-resistant salt-resistant nano heterogeneous composite oil displacement system, a preparation method and application thereof, wherein the temperature-resistant salt-resistant nano heterogeneous composite oil displacement system is formed by compounding pre-crosslinked gel particles, instant polymers and nano imbibition agents step by step, and has higher viscosity and viscoelasticity under the condition that the temperature is less than or equal to 90 ℃ and the total mineralization degree is less than or equal to 32868mg/L, and can be deep into stratum with permeability less than or equal to 50 multiplied by 10 < -3 > mu m < 2 > to exert an oil displacement effect.
The nanoparticles can also form stable emulsions in addition to increasing the viscoelasticity and stability of the flooding system. The nano particles generate irreversible adsorption at the oil-water interface, and stable emulsion can be formed under the action of no alkali through the interface stabilization action of the nano particles. Compared with the traditional surfactant used as the emulsifier to form emulsion, the nano-particles have the advantages of less stabilizer dosage, less environmental pollution, good emulsion stability and the like. However, most of the nanoparticles form stable emulsion in large amount and cannot be effectively matched with a composite flooding system, so that efficient oil displacement cannot be realized. Therefore, it is necessary to develop a high-efficiency nanocomposite flooding system with high emulsifying properties.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a two-dimensional nanoparticle composite flooding composition and a two-dimensional nanoparticle preparation method, and the composition realizes efficient oil washing and emulsification expansion by introducing nanoparticles to strengthen the emulsifying capacity of a nanocomposite flooding system, solves the problem of poor emulsifying and flooding effects of the composite flooding system under the alkali-free condition, and has important significance for efficient development of medium-low permeability oil reservoirs.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the composite flooding composition containing the two-dimensional nano particles comprises, by mass, 0.01-0.05 wt% of the two-dimensional nano particles, 0.05-0.50 wt% of a surfactant, 0.05-0.30 wt% of a polymer and 99.89-99.15 wt% of water.
Preferably, the two-dimensional nano particles are two-dimensional organic-inorganic composite nano particles M with amphipathy x O y 。
Preferably, the two-dimensional organic-inorganic composite nanoparticle M x O y And M in (2) represents inorganic ions including fe3+, ca2+, mg2+, co2+, ni2+, cu2+ and mn2+.
Preferably, the two-dimensional organic-inorganic composite nanoparticle M x O y O in (2) is a deprotonated organic ligand including dibenzoic acid, phenylenediamine, tribenzoic acid, methyltribenzoic acid, 2-amino-1, 4-phthalic acid, 2-amino-1, 3, 5-benzenetricarboxylic acid, biphenyl-4, 4-dicarboxylic acid and naphthalene-2, 6-dicarboxylic acid.
Preferably, the two-dimensional organic-inorganic composite nanoparticle M x O y X: y is 1:5 to 5:1.
Preferably, the surfactant comprises one or a combination of a plurality of petroleum sulfonate, heavy alkylbenzenesulfonate, gemini surfactant, alkanolamide, alkyl glycoside, fatty alcohol polyoxyethylene, hydroxysulfobetaine surfactant, long-chain alkyl ammonium oxide, fatty alcohol polyoxyethylene ether carboxylate and fatty alcohol polyoxyethylene ether sulfonate.
Preferably, the polymer is a hydrophobic association polymer, a star-shaped temperature-resistant salt-resistant polymer or a partially hydrolyzed polyacrylamide polymer, and the average molecular weight of the polymer is 800 ten thousand to 3500 ten thousand.
A method of preparing two-dimensional nanoparticles comprising the steps of:
firstly, placing inorganic salt in a beaker and dissolving the inorganic salt in a solvent to obtain an inorganic salt solution, and then placing an organic ligand in another beaker and dissolving the organic ligand in the solvent to obtain an organic ligand solution;
adding the metal salt solution and the organic ligand solution into a reaction kettle according to a certain proportion, uniformly mixing and stirring, and heating at a constant temperature until the reaction is complete to obtain a product;
and washing, filtering and purifying the product to obtain the two-dimensional nano particle solid.
Preferably, the inorganic salt is a metal salt, wherein metal ions in the inorganic salt comprise Fe3+, ca2+, mg2+, co2+, ni2+, cu2+ and Mn2+, and counter ions in the inorganic salt comprise Cl-, br-and NO3-.
Preferably, the organic ligands include dibenzoic acid, tribenzoic acid, methyltritcarboxylic acid, 2-amino-1, 4-phthalic acid, 2-amino-1, 3, 5-benzenetricarboxylic acid, biphenyl-4, 4-dicarboxylic acid and naphthalene-2, 6-dicarboxylic acid.
Preferably, the solvent of the metal salt is water or a mixed solvent of water and alcohol.
Preferably, the solvent of the organic ligand comprises one or more of methanol, ethanol, isopropanol, N-butanol, ethyl acetate, N-dimethylformamide, N-dimethyl sulfoxide, N-dimethylacetamide, chloroform and methylene dichloride.
Preferably, the molar ratio of the metal ions to the organic ligands is 5:1-1:5.
Preferably, the pH value of the reaction of the metal salt solution and the organic ligand solution is 5-11, the reaction temperature is 10-250 ℃, and the reaction time is 1-10 hours.
The invention has the beneficial effects that:
1. the synthesis method of the nano material provided by the invention realizes the controllable synthesis of the two-dimensional nano material, and the preparation method is relatively simple and convenient and has strong practicability;
2. the emulsion containing the two-dimensional nanomaterial can greatly improve the stability and viscosity of the emulsion, the two-dimensional nanomaterial and crude oil are adsorbed on an oil-water interface through pi interaction and the like, a three-dimensional barrier is formed at the oil-water interface to prevent liquid drops from coalescing, so that the emulsion is stabilized, the emulsion can still form stable water-in-oil emulsion with the crude oil under the conditions of low concentration and higher water content, and the emulsifying and tackifying effects are obvious;
3. the composite flooding composition containing the two-dimensional nano particles has the effects of strong emulsification and expansion of sweep volume, and the parallel core flooding experiment improves the recovery ratio by more than 30%, so that the composite flooding composition has a wide application prospect in medium-low permeability reservoirs.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a scanning electron microscope image of a two-dimensional nanomaterial prepared in example 1;
FIG. 2 is a transmission electron microscope image of the two-dimensional nanomaterial prepared in example 2;
FIG. 3 is a transmission electron microscope image of the two-dimensional nanomaterial prepared in example 3;
FIG. 4 is a transmission electron microscope image of the two-dimensional nanomaterial prepared in example 4;
FIG. 5 is a photomicrograph of the emulsion at a water to oil volume ratio of 7:3 in example 5;
FIG. 6 is a state that two-dimensional nanoparticles of different concentrations are formed into an emulsion in example 5;
FIG. 7 is a photomicrograph of an emulsion of 0.2 weight percent two-dimensional nanoparticle formation in example 5;
FIG. 8 is a photomicrograph of the emulsion at a water to oil volume ratio of 7:3 in example 6;
FIG. 9 is the dynamic interfacial tension of the composite flooding system and Jilin crude oil of example 7;
FIG. 10 is a plot of interfacial tension of the composite flooding system and Jilin crude oil as a function of adsorption number for test example 7.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a preparation method of two-dimensional nano particles.
3.8g of manganese chloride and 4.2g of tribenzoic acid are added into a 200mL flask, 100mL of ethanol solution is poured into the beaker, a magnetic stirrer is added for uniform stirring, then 4mL of triethylamine is added into the system dropwise, stirring is continued until no reaction occurs, and nano particles are obtained after filtration and washing. The microscopic morphology of the nanoparticles is shown in figure 1.
Example 2
The embodiment provides a preparation method of two-dimensional nano particles.
2.48g of nickel acetate tetrahydrate is weighed, 600mL of deionized water is added for dissolution, 0.91g of 2-amino-1, 4-phthalic acid is weighed, 600mL of N, N-dimethylacetamide is added for dissolution, the two solutions are sequentially poured into a reaction kettle for screwing, the reaction kettle is heated to 180 ℃ for reaction growth for 3 hours, the reaction kettle is taken out after the reaction is finished, cooled to room temperature, centrifuged, washed twice with deionized water, washed twice with ethanol and dried, and the two-dimensional nano particles are obtained. The microscopic morphology of the nanoparticles is shown in figure 2.
Example 3
The embodiment provides a preparation method of two-dimensional nano particles.
Weighing 4.92g of nickel acetate tetrahydrate, adding 300mL of deionized water for dissolution, weighing 1.82g of 2-amino-1, 4-phthalic acid, adding 300mL of N, N-dimethylacetamide for dissolution, pouring the two solutions into a reaction kettle successively, heating the screwed reaction kettle to 150 ℃ for reaction and growth for 3 hours, taking out the reaction kettle after the reaction is finished, cooling to room temperature, centrifuging, washing twice with deionized water, washing twice with ethanol, drying, and finally sealing and preserving with a brown glass vial. The microscopic morphology of the nanoparticles is shown in fig. 3.
Example 4
The embodiment provides a preparation method of two-dimensional nano particles.
Weighing 4.92g of nickel acetate tetrahydrate, adding 300mL of deionized water for dissolution, weighing 1.82g of 2-amino-1, 4-phthalic acid, adding 300mL of N, N-dimethylacetamide for dissolution, pouring the two solutions into a reaction kettle successively, heating the screwed reaction kettle to 120 ℃ for reaction and growth for 3 hours, taking out the reaction kettle after the reaction is finished, cooling to room temperature, centrifuging, washing twice with deionized water, washing twice with ethanol, drying, and finally sealing and preserving with a brown glass vial. The microscopic morphology of the nanoparticles is shown in fig. 4.
Example 5
This example evaluates the emulsifying properties of the two-dimensional nanoparticles prepared in example 1.
The two-dimensional nanoparticles prepared in example 1 were formulated into a dispersion with formation water, and the emulsion viscosity and stability of the nanoparticle dispersion with crude oil were tested. The concentration of the two-dimensional nano particles is 0.009wt%, the oil-water used is Xinjiang oil-water, and the test temperature is 43 ℃. The nanoparticle dispersion and the crude oil are placed in a beaker according to the volume ratio of oil to water of 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2 and 9:1 (the volume fraction of water is 10%,20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%) in turn, the temperature is kept at 72 ℃ for 1 hour, the dispersion is carried out for 1 minute by an IKA homogenizer, the emulsification condition is observed, and the apparent viscosity of the emulsion is tested by a rheometer. The test temperature was 43℃and the shear rate was 10s-1. Under the oil-water volume ratio of 3:7, the oil-water can be emulsified to form stable water-in-oil emulsion, and the highest water content can reach 80%. The emulsion viscosity increases gradually with increasing oil-water ratio, and is up to 30 times higher than the viscosity of crude oil. At a water to oil volume ratio of 7:3, the emulsion state is shown in FIG. 5.
TABLE 1 emulsion State and viscosity at different oil-Water ratios of two-dimensional nanoparticles prepared in example 1
The two-dimensional nanoparticles prepared in example 1 were formulated into dispersions with formation water, and emulsion stability between nanoparticle dispersions of different concentrations and crude oil was tested. The concentration of the two-dimensional nano particles is 0.002wt%, 0.005wt%, 0.01wt%, 0.02wt%, 0.05wt%, 0.1wt%, 0.2wt% and 0.3wt% of Xinjiang oil water, the testing temperature is 43 ℃, the nano particle dispersion liquid and the crude oil are placed in a beaker according to the oil-water volume ratio of 2.5/7.5, the temperature is kept at 43 ℃ for 1 hour, the IKA homogenizer is used for dispersing for 1 minute, the emulsification condition is observed, and the apparent viscosity of the emulsion is tested by a rheometer. Test temperature 43℃and shear rate 10s -1 . At the oil-water volume ratio of 2.5/7.5, oil-water can be emulsified to form stable water-in-oil emulsion within the concentration range of 0.005wt% to 0.3wt%, the emulsion state at different concentrations is shown in figure 6, and the microscopic photograph of the 0.2wt% emulsion is shown in figure 7.
TABLE 2 emulsion State at concentration of two-dimensional nanoparticles prepared in example 1
| Nanoparticle concentration | Emulsion state |
| 0 | Phase separation |
| 0.002wt％ | Phase separation |
| 0.005wt％ | Phase separation-free |
| 0.01wt％ | Phase separation-free |
| 0.02wt％ | Phase separation-free |
| 0.05wt％ | Phase separation-free |
| 0.1wt％ | Phase separation-free |
| 0.2wt％ | Phase separation-free |
| 0.3wt％ | Phase separation-free |
Example 6
This example evaluates the emulsifying properties of the two-dimensional nanoparticles prepared in example 3.
The two-dimensional nanoparticles prepared in example 3 were formulated into dispersions with formation water and the emulsion viscosity and stability of the nanoparticle dispersions with crude oil were tested. The concentration of the two-dimensional nano particles is 0.006wt%, the oil water is Jilin oil water, and the test temperature is 55 ℃. The volume ratio of water to oil is 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2 and 9:1 (the volume fraction of water is 10 in sequence)The nanoparticle dispersion and crude oil were placed in a beaker at a constant temperature of 55 ℃ for 1 hour,%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, dispersed with an IKA homogenizer for 1 minute, and the emulsification was observed, and the apparent viscosity of the emulsion was measured by a rheometer. Test temperature 55℃and shear rate 10s -1 . Under the oil-water volume ratio of 3:7, the oil-water can be emulsified to form stable water-in-oil emulsion, and the highest water content can reach 70%. The viscosity of the emulsion gradually increases with the increase of the oil-water ratio, and is 10 times higher than the viscosity of crude oil at the most. At a water to oil volume ratio of 7:3, the emulsion state is shown in FIG. 8.
TABLE 3 emulsion State and viscosity at different oil-Water ratios of two-dimensional nanoparticles prepared in example 3
| Oil-water ratio | Emulsion state | Viscosity (mPas) |
| Crude oil | / | 14.1 |
| 1:9 | Phase separation-free | 18.9 |
| 2:8 | Phase separation-free | 26.6 |
| 3:7 | Phase separation-free | 39.8 |
| 4:6 | Phase separation-free | 54.5 |
| 5:5 | Phase separation-free | 92.3 |
| 6:4 | Phase separation-free | 162.1 |
| 7:3 | Phase separation-free | 218.6 |
| 8:2 | Phase separation | 73.2 |
| 9:1 | Phase separation | 20.8 |
Example 7
This example evaluates the performance of the two-dimensional nanoparticles prepared in example 3 with a heavy alkylbenzene sulfonate surfactant, polymer to form a composite displacement system.
The two-dimensional nano particles prepared in the example 3, a heavy alkylbenzene sulfonate surfactant and a polymer are prepared into a composite flooding system. In the compound flooding system solution, the heavy alkylbenzene sulfonate surfactant is synthesized in a laboratory, and has the mass percent of 0.05wt%, 0.1wt%, 0.2wt%, 0.3wt%, the mass percent of the two-dimensional nano particles is 0.006wt%, the mass percent of the polymer is 0.18wt%, and the molecular weight is 1600 ten thousand. The oil-water used was Jilin oil-water, and the test temperature was 55deg.C. The interfacial tension of the composite flooding system and Jilin crude oil was tested by a TX500C interfacial tensiometer, the results of which are shown in FIG. 9. As can be seen from the graph, the evaluated composite flooding system can reach ultralow interfacial tension with Jilin crude oil, and has excellent interfacial properties.
The adsorption resistance of the compound oil displacement system prepared in the example was evaluated by interfacial tension. Adding 60-100 mesh Jilin oil sand and a compound drive system into a grinding conical flask with a plug according to a solid-liquid ratio of 1:9, sealing, placing into a constant-temperature oscillating water bath at 55 ℃ for oscillating for 24 hours, taking out the conical flask, measuring the interfacial tension of an upper solution, continuing to adsorb with new oil sand, repeating the steps until the interfacial tension cannot reach ultra-low, and obtaining a result shown in figure 10. It can be seen that the interfacial tension of the compound oil displacement system is still ultra-low after four times of oil-water adsorption of Jilin, and the anti-adsorption performance is excellent.
The oil displacement efficiency of the compound flooding system prepared in the embodiment is evaluated through a core oil displacement experiment. Table 4 shows the results of the oil displacement experiment of the compound oil displacement system prepared in this example. The weight percentage of the heavy alkylbenzene sulfonate surfactant in the composite flooding system is 0.3wt%, the weight percentage of the two-dimensional nano particles is 0.006wt%, the weight percentage of the polymer is 0.18wt%, the molecular weight is 1600 ten thousand, the oil water is Jilin oil field oil water, the test temperature is 55 ℃, and the slug of the composite flooding system is 0.5PV. Experimental results show that the recovery ratio of the composite system is improved to 32% -35%, which shows that the composite oil displacement system provided by the invention has great advantages in the chemical flooding field.
Table 4 oil displacement effect of the Complex oil displacement System prepared in example 7
Example 8
This example evaluates the performance of the two-dimensional nanoparticles prepared in example 4 in forming a composite oil displacement system with fatty alcohol-polyoxyethylene ether surfactant and polymer.
The two-dimensional nano particles prepared in the example 4, fatty alcohol polyoxyethylene ether and a polymer are prepared into a compound flooding system. In the composite flooding system solution, the fatty alcohol-polyoxyethylene ether is synthesized in a laboratory, the mass percentage is 0.05wt%, 0.1wt%, 0.2wt%, 0.3wt%, the mass percentage of the two-dimensional nano particles is 0.01wt%, the mass percentage of the polymer is 0.18wt%, and the molecular weight is 1200 ten thousand. The oil-water used is the oil-water of hong Kong, and the test temperature is 78 ℃. The interfacial tension of the composite flooding system and the port crude oil was measured by a TX500C interfacial tensiometer, and the results are shown in fig. 10. As can be seen from the graph, the evaluated composite flooding system can reach ultra-low interfacial tension with the crude oil in the harbor, and has excellent interfacial properties.
The oil displacement efficiency of the compound flooding system prepared by the embodiment in a certain extremely poor double-pipe parallel rock core is evaluated through a rock core oil displacement experiment. Table 5 shows the results of the oil displacement experiment of the compound oil displacement system prepared in this example. The mass percentage of the fatty alcohol polyoxyethylene ether surfactant in the composite flooding system is 0.3wt%, the mass percentage of the two-dimensional nano particles is 0.01wt%, the mass percentage of the polymer is 0.18wt%, the molecular weight is 1200 ten thousand, the oil-water used is the oil-water of a harbour, the test temperature is 78 ℃, and the slug of the composite flooding system is 0.5PV. The extremely poor rock core is 6.4, the two rock cores are firstly driven to have water content of more than 98% respectively, and then the two rock cores with high permeability and low permeability are connected in parallel for compound driving and post-water driving. Experimental results show that the composite system has better use on low-permeability and high-permeability cores, the high-permeability cores improve the recovery ratio by 35.9%, the low-permeability cores improve the recovery ratio by 24.6%, and the total improvement recovery ratio reaches 30.1%, so that the composite oil displacement system provided by the invention has great advantages in the chemical flooding field.
Table 5 oil displacement effect of the complex oil displacement system prepared in example 8
It should be understood that the foregoing examples of the present invention are provided for the purpose of illustration only and are not intended to limit the embodiments of the present invention, and that various other changes and modifications can be made by those skilled in the art based on the foregoing description, and it is not intended to be exhaustive of all the embodiments, and all obvious changes and modifications that come within the scope of the invention are defined by the following claims.
Example 9
The organic compound with aryl structure in the organic ligand is easier to form two-dimensional nano particles than organic acid or amine with linear structure, and the formed two-dimensional nano particles have stronger interaction with crude oil and are easier to form stable emulsion with crude oil.
In addition, the composite flooding composition containing the two-dimensional nano particles can be used as an in-situ emulsification oil displacement system, and the emulsifier composition containing the two-dimensional nano materials can be injected into water flooding or polymer flooding for tertiary oil recovery, so that the swept volume and the efficiency are improved through efficient emulsification. The composite flooding composition containing the two-dimensional nano particles provided by the invention can be used for improving the recovery ratio by medium-low permeability.
In the case of M x O y Wherein, x: y is the ratio of metal ion M to organic ligand O in the two-dimensional nanoparticle.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A two-dimensional nanoparticle-containing composite flooding composition, characterized in that the components of the two-dimensional nanoparticle-containing composite flooding composition comprise, in mass percent, 0.01-0.05 wt% of two-dimensional nanoparticles, 0.05-0.50 wt% of a surfactant, 0.05-0.30 wt% of a polymer, and 99.89-99.15 wt% of water;
the preparation method of the two-dimensional nano-particles comprises the following steps: weighing 4.92g of nickel acetate tetrahydrate, adding 300mL of deionized water for dissolution, weighing 1.82g of 2-amino-1, 4-phthalic acid, adding 300mL of N, N-dimethylacetamide for dissolution, pouring the two solutions into a reaction kettle in sequence, heating the screwed reaction kettle to 150 ℃ for reaction and growth for 3 hours, taking out the reaction kettle after the reaction is finished, cooling to room temperature, centrifuging, washing twice with deionized water, washing twice with ethanol, and drying; or,
the preparation method of the two-dimensional nano-particles comprises the following steps: weighing 4.92g of nickel acetate tetrahydrate, adding 300mL of deionized water for dissolution, weighing 1.82g of 2-amino-1, 4-phthalic acid, adding 300mL of N, N-dimethylacetamide for dissolution, pouring the two solutions into a reaction kettle successively, heating the screwed reaction kettle to 120 ℃ for reaction and growth for 3 hours, taking out the reaction kettle after the reaction is finished, cooling to room temperature, centrifuging, washing twice with deionized water, washing twice with ethanol, and drying.
2. The two-dimensional nanoparticle composite flooding composition according to claim 1, wherein the surfactant comprises one or a combination of a plurality of petroleum sulfonate, heavy alkylbenzenesulfonate, gemini surfactant, alkanolamide, alkyl glycoside, fatty alcohol polyoxyethylene, hydroxysulfobetaine surfactant, long-chain alkyl ammonium oxide, fatty alcohol polyoxyethylene ether carboxylate and fatty alcohol polyoxyethylene ether sulfonate.
3. The two-dimensional nanoparticle composite flooding composition according to claim 1, wherein the polymer is a hydrophobically associating polymer, a star-shaped heat-resistant salt-resistant polymer or a partially hydrolyzed polyacrylamide polymer, and the average molecular weight of the polymer is 800-3500 ten thousand.
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