CN118516099A - Mixed injection composition for carbon dioxide flooding and preparation method thereof - Google Patents
Mixed injection composition for carbon dioxide flooding and preparation method thereof Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 247
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 123
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 123
- 239000000203 mixture Substances 0.000 title claims abstract description 82
- 238000002347 injection Methods 0.000 title claims abstract description 65
- 239000007924 injection Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000002114 nanocomposite Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 25
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 24
- 239000000661 sodium alginate Substances 0.000 claims abstract description 24
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000001913 cellulose Substances 0.000 claims abstract description 19
- 229920002678 cellulose Polymers 0.000 claims abstract description 19
- 239000010703 silicon Substances 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 15
- -1 diamine compound Chemical class 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 37
- 238000001035 drying Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 33
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 28
- 238000005303 weighing Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 20
- 239000004793 Polystyrene Substances 0.000 claims description 18
- 229920002223 polystyrene Polymers 0.000 claims description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 17
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 17
- 239000011833 salt mixture Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 13
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims description 10
- 229930195733 hydrocarbon Natural products 0.000 claims description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 230000032683 aging Effects 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 8
- 238000000967 suction filtration Methods 0.000 claims description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- PNGBYKXZVCIZRN-UHFFFAOYSA-M sodium;hexadecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCS([O-])(=O)=O PNGBYKXZVCIZRN-UHFFFAOYSA-M 0.000 claims description 5
- KBAFDSIZQYCDPK-UHFFFAOYSA-M sodium;octadecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCCCS([O-])(=O)=O KBAFDSIZQYCDPK-UHFFFAOYSA-M 0.000 claims description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 4
- VEFLKXRACNJHOV-UHFFFAOYSA-N 1,3-dibromopropane Chemical compound BrCCCBr VEFLKXRACNJHOV-UHFFFAOYSA-N 0.000 claims description 2
- YHRUOJUYPBUZOS-UHFFFAOYSA-N 1,3-dichloropropane Chemical compound ClCCCCl YHRUOJUYPBUZOS-UHFFFAOYSA-N 0.000 claims description 2
- ULTHEAFYOOPTTB-UHFFFAOYSA-N 1,4-dibromobutane Chemical compound BrCCCCBr ULTHEAFYOOPTTB-UHFFFAOYSA-N 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 2
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims description 2
- GCOWZPRIMFGIDQ-UHFFFAOYSA-N n',n'-dimethylbutane-1,4-diamine Chemical compound CN(C)CCCCN GCOWZPRIMFGIDQ-UHFFFAOYSA-N 0.000 claims description 2
- DILRJUIACXKSQE-UHFFFAOYSA-N n',n'-dimethylethane-1,2-diamine Chemical compound CN(C)CCN DILRJUIACXKSQE-UHFFFAOYSA-N 0.000 claims description 2
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 2
- 239000010779 crude oil Substances 0.000 abstract description 59
- 238000011084 recovery Methods 0.000 abstract description 34
- 239000003921 oil Substances 0.000 abstract description 31
- 238000006073 displacement reaction Methods 0.000 abstract description 29
- 239000012530 fluid Substances 0.000 abstract description 18
- 150000003377 silicon compounds Chemical class 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 28
- 239000008367 deionised water Substances 0.000 description 26
- 229910021641 deionized water Inorganic materials 0.000 description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 25
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- 230000009286 beneficial effect Effects 0.000 description 16
- 238000001132 ultrasonic dispersion Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 239000011435 rock Substances 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 8
- 235000019441 ethanol Nutrition 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 230000003993 interaction Effects 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000003837 high-temperature calcination Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 210000005239 tubule Anatomy 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 238000010795 Steam Flooding Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- IUNMPGNGSSIWFP-UHFFFAOYSA-N dimethylaminopropylamine Chemical compound CN(C)CCCN IUNMPGNGSSIWFP-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 150000003512 tertiary amines Chemical group 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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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
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The application relates to the technical field of carbon dioxide flooding, in particular to a mixed injection composition for carbon dioxide flooding and a preparation method thereof. The mixed injection composition for carbon dioxide flooding comprises the following components: sodium alginate, silicon-based cellulose, nano-composites and water. Wherein the preparation method of the nano-composite comprises the following steps: firstly, preparing nano oxide with small particle size and large specific surface area, then loading a silicon compound with low surface energy on the surface of the nano oxide, then externally connecting a diamine compound on the silicon compound to form quaternary ammonium salt, and finally combining with an anionic surfactant. The mixed injection composition for carbon dioxide flooding and carbon dioxide are cooperated to act on the stratum oil field, so that the interfacial tension of the displacement fluid and crude oil can be effectively reduced, the sweep efficiency is improved, the carbon dioxide fingering phenomenon is lightened, and the recovery ratio of the crude oil is improved.
Description
Technical Field
The application relates to the technical field of carbon dioxide flooding, in particular to a mixed injection composition for carbon dioxide flooding and a preparation method thereof.
Background
Petroleum is an important energy source, more than 40% of total energy demand and more than 95% of vehicular fuel are provided at present, the total global petroleum yield is continuously reduced, the energy demand is increased year by year, and in order to improve the oil and gas recovery ratio and solve the increasingly serious contradiction between oil and gas supply and demand, the oil and gas yield can be improved by injecting high-pressure fluid and unconventional oil and gas resources are extracted, and the high-pressure water flooding, steam flooding and gas flooding are widely applied.
Carbon dioxide is a non-polar molecule, and has the characteristics of low viscosity, strong fluidity and easy dissolution in crude oil because of low critical temperature and critical pressure, and is easy to mix with the crude oil, and after being injected into a stratum, the carbon dioxide can timely supplement stratum energy, thereby playing roles of reducing viscosity of the crude oil, improving oil-water fluidity ratio and the like. Therefore, the carbon dioxide flooding is widely applied to the development of unconventional oil and gas resources such as coal bed gas reservoirs, shale gas reservoirs, heavy oil and super heavy oil reservoirs, condensate gas reservoirs, low-permeability reservoirs, carbonate reservoirs, complex fault block reservoirs, water flooding abandoned reservoirs, depleted gas reservoirs and the like, not only can the recovery ratio be improved, but also the problem of carbon dioxide sequestration can be solved, the atmospheric environment is protected, and the greenhouse effect is inhibited.
However, in the oil displacement process, the supercritical carbon dioxide has low viscosity, is close to gas, has better flow, is difficult to control under complex stratum conditions, is easy to generate channeling, causes unfavorable fluidity ratio, reduces the sweep efficiency of the carbon dioxide, and reduces the recovery ratio of crude oil.
In order to achieve higher recovery of crude oil, methods are commonly used to increase the viscosity of the displacement fluid, decrease the viscosity of the crude oil, decrease the interfacial tension between the displacement fluid and the crude oil, change the wettability of the reservoir rock, and the like. The patent application document with publication number CN103867169A discloses a method for controlling the fluidity of carbon dioxide flooding by using an air-soluble surfactant, wherein the selected air-soluble surfactant has certain solubility in water and supercritical carbon dioxide, and the fluidity of carbon dioxide is controlled in an underground foaming mode, so that the fluidity of carbon dioxide is reduced, the sweep efficiency of carbon dioxide is increased, and the recovery ratio is improved. However, this method has high requirements for the surfactant used, and the solubility of supercritical carbon dioxide in the air-soluble surfactant is limited, and the improvement range of the carbon dioxide sweep efficiency is not clear.
Disclosure of Invention
In order to solve the problems in carbon dioxide flooding and improve the recovery ratio of crude oil, the application provides a mixed injection composition for carbon dioxide flooding and a preparation method thereof.
A mixed injection composition for carbon dioxide flooding comprises the following components in percentage by weight: sodium alginate 0.3-0.5%, silicon-based cellulose 1.2-1.5%, nano-composite 10-17%, and water in balance;
the preparation method of the nano-composite comprises the following steps:
S1: dispersing polystyrene powder in methanol water solution, heating to 50-60 ℃, adding ammonia water, magnesium nitrate and aluminum nitrate, uniformly mixing, performing microwave action for 2-3 hours, standing and aging the product for 18-24 hours, and performing suction filtration, washing, drying and calcination to obtain a nano composite oxide;
S2: dispersing the nano composite oxide in a strong alkali solution, stirring for 5-10min, reacting for 6-24h at 90-105 ℃, centrifuging, washing and drying the product to obtain the nano oxide;
S3: dispersing the nano oxide in ethanol water solution, adding concentrated ammonia water and tetraethyl orthosilicate, stirring for reaction for 8-15h, heating to 65-90 ℃, refluxing for 2-6h, and drying to obtain the nano oxide.
In the technical scheme, firstly, the aqueous solution of sodium alginate and silicon-based cellulose has higher viscosity, can be used as a tackifier of oil displacement fluid, reduces the flow speed of water phase in an oil reservoir, reduces the interference of water phase flow with oil phase flow, improves the fluidity of the oil phase, improves the permeability of oil reservoir rocks, changes the surface wettability of the rocks, and reduces the interfacial tension of the oil displacement fluid and crude oil, thereby improving the recovery ratio of the crude oil; secondly, the sodium alginate can react with metal ions in the stratum, such as calcium ions, to form gel for blocking the high-permeability interval, and gas breakthrough can be reduced, so that the sweep efficiency of the oil reservoir is increased, and the crude oil recovery rate is improved; furthermore, the silicon-based cellulose can adsorb and stabilize carbon dioxide molecules, so that the original free carbon dioxide can more effectively participate in the oil displacement process, and meanwhile, the fluidity ratio of the carbon dioxide to the crude oil can be reduced, the phenomenon of carbon dioxide fingering is reduced, the sweep efficiency of the carbon dioxide is improved, and the recovery ratio of the crude oil is improved; in addition, the silicon-based cellulose and sodium alginate have good biocompatibility and degradability, have small influence on the environment, and are beneficial to realizing green sustainable oilfield development.
In the preparation process of the nano composite, the nano composite oxide with a small particle size and a stable core-shell structure taking polystyrene as a core and magnesium oxide and aluminum oxide as shells is prepared by microwave action; the alumina in the polystyrene and the shell layer is removed through high-temperature calcination and strong alkali corrosion, so that the nano oxide with larger specific surface area is obtained, and the high-content magnesia of the nano oxide can provide a large amount of alkaline sites, thereby being beneficial to the adsorption of carbon dioxide and greatly increasing the adsorption amount of the carbon dioxide, further slowing down the phenomenon of carbon dioxide fingering, improving the sweep efficiency of the carbon dioxide and further improving the recovery ratio of crude oil; then, a silicon compound with low surface energy is loaded outside the nano oxide by a sol-gel method, so that the surface tension of a mixed injection composition for carbon dioxide flooding is reduced, the interfacial tension between a displacement fluid and crude oil is reduced, the displacement fluid is easier to wet the surface of rock and enter the pores of the rock, and the crude oil is displaced; moreover, the crude oil can be emulsified and dispersed, the resistance is reduced, the tail end effect of the capillary is weakened, the self-priming phenomenon of the capillary is enhanced, and the outflow of the crude oil is facilitated; in addition, after the nano oxide loads the silicon compound, the surface active sites are more, which is more beneficial to modification.
Preferably, in the step S1, the mass ratio of the polystyrene powder to the magnesium nitrate to the aluminum nitrate is 1 (16-32) to 5-12.
In the above technical scheme, polystyrene is used as a core, magnesium oxide and aluminum oxide are used as shells, and in order to obtain nano oxide with stable structure and large specific surface area, the addition amount of polystyrene powder, magnesium nitrate and aluminum nitrate should be proper. If the adding amount of the polystyrene powder is too large and the adding amount of the magnesium nitrate is too small, the polystyrene is removed after high-temperature calcination, and the structure of the nano oxide can collapse, so that the specific surface area is reduced; if the addition amount of the polystyrene powder is too small, the addition amount of the magnesium nitrate is too large, and the specific surface area of the nano oxide is also reduced after high-temperature calcination; if the adding amount of the polystyrene powder and the magnesium nitrate is certain, when the adding amount of the aluminum nitrate is too large, more and larger pore channels can be formed after strong alkali corrosion, so that the collapse of the nano oxide structure is easy to cause, and the specific surface area is reduced; if the addition amount of aluminum nitrate is too small, the number of pore channels which can be formed after corrosion by strong alkali is small, and the specific surface area of the nano oxide can be reduced.
Preferably, in the step S3, the mass ratio of the nano oxide to the tetraethyl orthosilicate is 1 (10-25).
In the technical scheme, when the addition amount of the nano oxide is certain, if the addition amount of the tetraethyl orthosilicate is too small, the surface tension of the obtained nano composite is large, and the rock is not easy to wet rapidly, so that the displacement fluid is not easy to enter the rock pores rapidly to displace the crude oil. The number of active sites on the surface of the nano oxide is also reduced, which is unfavorable for modification; if the addition amount of tetraethyl orthosilicate is too large, the cost is increased, the adsorption performance of the nano oxide on the carbon dioxide is possibly influenced, the adsorption sites of the nano oxide on the carbon dioxide are reduced, the fluidity of the carbon dioxide is not reduced, the sweep efficiency of the carbon dioxide is reduced, and the crude oil recovery ratio is reduced.
Preferably, the nanocomposite is modified by a method comprising the steps of:
1) Dispersing the nano-composite in water, adding diamine compound, stirring and reacting for 8-16h, adding dihalogenated hydrocarbon, heating to 80-95 ℃, reacting for 2-4h, and drying to obtain quaternary ammonium salt mixture;
2) Dispersing the quaternary ammonium salt mixture in water, adding anionic surfactant, stirring at 60-80deg.C for 12-24 hr, and drying.
In the technical scheme, firstly, a diamine compound containing tertiary amine groups is grafted on the nano-composite, and the diamine compound reacts with dihalogenated hydrocarbon to generate quaternary ammonium salt with positive charges, so that the quaternary ammonium salt plays a role of a surfactant, and the positive charges are beneficial to adsorption of carbon dioxide, so that the viscosity of the carbon dioxide is improved, the finger-in phenomenon is lightened, the contact rate of the carbon dioxide and crude oil is improved, the sweep efficiency of the carbon dioxide is improved, and the recovery ratio of the crude oil is improved; then, an anionic surfactant is added into the quaternary ammonium salt mixture, and the quaternary ammonium salt with positive charges and the anionic surfactant have good fluidity through strong cation-anion interaction, so that the nano-composite is beneficial to being cooperated with carbon dioxide, and the crude oil recovery ratio is improved.
Preferably, in the step 1), the mass ratio of the nano compound, the diamine compound and the dihalogenated hydrocarbon is 1 (0.2-0.6): 0.4-1.
In the technical scheme, firstly, grafting diamine compounds on the surface of the nano-composite, if the addition amount of the diamine compounds is too large, part of the diamine compounds cannot be grafted on the surface of the nano-composite, and if the addition amount of the diamine compounds is too small, the grafting amount is correspondingly reduced, the positive charge of the formed quaternary ammonium salt is reduced, and the adsorption effect on carbon dioxide is weakened; if the addition amount of the dihalogenated hydrocarbon is too small, part of the grafted diamine compound cannot form the quaternary ammonium salt with positive charges, and if the addition amount of the dihalogenated hydrocarbon is too large, part of the dihalogenated hydrocarbon cannot participate in the reaction to form the quaternary ammonium salt, so that the mass ratio of the nanocomposite, the diamine compound and the dihalogenated hydrocarbon is controlled within a proper range.
Preferably, in step 2), the anionic surfactant is one of sodium dodecyl sulfonate, sodium hexadecyl sulfonate and sodium octadecyl sulfonate.
By adopting the technical scheme, firstly, the anionic surfactant can be combined with the quaternary ammonium salt with positive charges, and the nano-composite has good fluidity through the interaction of cations and anions, so that the nano-composite is beneficial to being cooperated with carbon dioxide, and the crude oil recovery ratio is improved; secondly, the introduction of sulfonate is beneficial to improving the acid resistance, salt resistance and temperature resistance of the mixed injection composition for carbon dioxide flooding, so that the mixed injection composition is more easily adapted to stratum environment; in addition, the fatty chains of the anionic surfactant facilitate displacement of a wider range of crude oils, thereby enhancing oil recovery.
Preferably, in the step 2), the mass ratio of the quaternary ammonium salt mixture to the anionic surfactant is 1 (2.3-4.2).
In the technical scheme, when the addition amount of the quaternary ammonium salt mixture is fixed, if the addition amount of the anionic surfactant is too small, the interaction between positive and negative charges is weakened, the fluidity of the mixed injection composition for carbon dioxide flooding can be influenced, and further the displacement effect and the crude oil recovery ratio are influenced; if too much anionic surfactant is added, some of the anionic surfactant may be in a free form, and may affect the flooding effect of the co-injected composition for carbon dioxide flooding.
A preparation method of a mixed injection composition for carbon dioxide flooding comprises the following steps:
and weighing sodium alginate, silicon-based cellulose, nano-composite and water according to a formula, and uniformly mixing to obtain the composite.
In the technical scheme, after the mixed injection composition for carbon dioxide flooding and carbon dioxide act on the oil-bearing stratum in a synergistic way, the mixed injection composition for carbon dioxide flooding and carbon dioxide form a displacement fluid together to displace crude oil in the stratum. In the first aspect, the mixed injection composition for carbon dioxide flooding has good fluidity and lower surface energy, can reduce the interfacial tension with crude oil, and is beneficial for the mixed injection composition for carbon dioxide flooding and carbon dioxide to enter rock pores and extrude the crude oil; in the second aspect, the mixed injection composition for carbon dioxide flooding has a larger specific surface area and active sites which are beneficial to adsorbing carbon dioxide, can adsorb a part of carbon dioxide, reduce the fluidity of the carbon dioxide, and improve the sweep efficiency of the carbon dioxide, thereby improving the recovery ratio of crude oil; in the third aspect, the mixed injection composition for carbon dioxide flooding has certain viscosity, can reduce the fluidity of water phase in an oil reservoir, reduce the interference of water phase and oil phase, and improve the fluidity of the oil phase, thereby improving the recovery ratio of crude oil.
The technical scheme of the application at least comprises the following beneficial effects:
1. The carrier of the nano-composite is a nano-material with small particle size and large specific surface area, so that the nano-composite can enter an ultralow permeability matrix more easily, and the nano-composite has a plurality of alkaline sites, thereby being beneficial to carbon dioxide adsorption; in addition, the low surface energy silicon compound in the nano composite can reduce the surface tension of the mixed injection composition for carbon dioxide flooding; the hydrophilic groups on the surface can wet the rock more easily, enter the rock pores and displace crude oil;
2. According to the application, the nano-composite is modified, and quaternary ammonium salt with positive charges is grafted on the surface of the nano-composite, so that the positive charges are beneficial to adsorbing carbon dioxide, the viscosity of the carbon dioxide is improved, the sweep efficiency of the carbon dioxide is increased, and the crude oil recovery ratio is improved; in addition, through the interaction of positive and negative charges, an anionic surfactant is adsorbed on the surface of the nano-composite, so that the mobility of the nano-composite is improved, the synergistic effect with carbon dioxide is improved, and the crude oil recovery ratio is improved;
3. The sodium alginate and the silicon-based cellulose in the application can increase the viscosity of the mixed injection composition for carbon dioxide flooding, reduce the fluidity of water phase in an oil reservoir, reduce the interference of water phase and oil phase, improve the fluidity of the oil phase, improve the adsorptivity of the carbon dioxide, improve the fluidity ratio of displacement fluid and crude oil, and improve the sweep efficiency of the carbon dioxide, thereby improving the recovery ratio of the crude oil; in addition, the plugging agent can also play a role in plugging a high-permeability interval in an oil reservoir, reduce gas breakthrough and fingering phenomena, and improve recovery ratio.
Drawings
Fig. 1 is a graph of the trend of the interfacial tension of displacement fluid and crude oil.
FIG. 2 is a graph of the trend of crude oil recovery.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the examples and comparative examples of the present application are commercially available in general except for the specific descriptions.
Examples
Example 1
The mixed injection composition for carbon dioxide flooding in the embodiment comprises the following components in percentage by weight: sodium alginate 0.3%, silicon-based cellulose 1.2%, nano-composite 10% and water in balance;
the preparation method of the nanocomposite in the embodiment comprises the following steps:
S1: weighing 1g of polystyrene powder, 100mL of methanol and 50mL of deionized water, placing the materials into a flask, performing ultrasonic dispersion for 0.5h, heating to 50 ℃, adding 80mL of 30% ammonia water, 16g of magnesium nitrate and 5g of aluminum nitrate, uniformly mixing and stirring, performing microwave action for 3h, standing and ageing the product for 24h, and placing the product into a muffle furnace at 550 ℃ for calcination for 3h after suction filtration, washing and drying to obtain a nano composite oxide;
s2: dispersing the nano composite oxide in a sodium hydroxide solution with the concentration of 3mol/L, stirring for 5min, transferring to a reaction kettle, reacting for 24h at 90 ℃, centrifuging the product after the reaction is finished, alternately washing with distilled water and absolute ethyl alcohol for several times to neutrality, and drying for 2h at 80 ℃ to obtain the nano oxide;
s3: weighing 2g of the nano oxide, 50mL of ethanol, 50mL of deionized water and 5mL of concentrated ammonia water, placing the materials in a three-neck flask, performing ultrasonic dispersion for 2h, adding 20g of tetraethyl orthosilicate, continuously stirring and reacting for 8h, heating to 65 ℃, refluxing for 6h, and drying to obtain the nano oxide;
the preparation method of the mixed injection composition for carbon dioxide flooding in the embodiment comprises the following steps:
Weighing 0.3g of sodium alginate, 1.2g of silicon-based cellulose, 10g of nano-composite and 88.5g of deionized water according to a formula, and uniformly mixing and stirring to obtain the sodium alginate.
Example 2
The mixed injection composition for carbon dioxide flooding in the embodiment comprises the following components in percentage by weight: sodium alginate 0.5%, silicon-based cellulose 1.5%, nano-composite 17% and water in balance;
the preparation method of the nanocomposite in the embodiment comprises the following steps:
s1: weighing 1g of polystyrene powder, 100mL of methanol and 50mL of deionized water, placing the materials into a flask, performing ultrasonic dispersion for 0.5h, heating to 60 ℃, adding 80mL of 30% ammonia water, 16g of magnesium nitrate and 5g of aluminum nitrate, uniformly mixing and stirring, performing microwave action for 2h, standing and ageing the product for 24h, and placing the product into a muffle furnace at 550 ℃ for calcination for 3h after suction filtration, washing and drying to obtain a nano composite oxide;
S2: dispersing the nano composite oxide in a potassium hydroxide solution with the concentration of 3mol/L, stirring for 10min, transferring to a reaction kettle, reacting for 6h at 105 ℃, centrifuging the product after the reaction is finished, alternately washing for several times with distilled water and absolute ethyl alcohol to be neutral, and drying for 2h at 80 ℃ to obtain the nano oxide;
S3: weighing 2g of the nano oxide, 50mL of ethanol, 50mL of deionized water and 5mL of concentrated ammonia water, placing the materials in a three-neck flask, performing ultrasonic dispersion for 2h, adding 20g of tetraethyl orthosilicate, continuously stirring and reacting for 15h, heating to 90 ℃, refluxing for 2h, and drying to obtain the nano oxide;
the preparation method of the mixed injection composition for carbon dioxide flooding in the embodiment comprises the following steps:
weighing 0.5g of sodium alginate, 1.5g of silicon-based cellulose, 17g of nano-composite and 81g of deionized water according to a formula, and uniformly mixing and stirring to obtain the sodium alginate.
Example 3
The mixed injection composition for carbon dioxide flooding in the embodiment comprises the following components in percentage by weight: sodium alginate 0.5%, silicon-based cellulose 1.5%, nano-composite 15% and water in balance;
the preparation method of the nanocomposite in the embodiment comprises the following steps:
s1: weighing 1g of polystyrene powder, 100mL of methanol and 50mL of deionized water, placing the materials into a flask, performing ultrasonic dispersion for 0.5h, heating to 60 ℃, adding 80mL of 30% ammonia water, 16g of magnesium nitrate and 5g of aluminum nitrate, uniformly mixing and stirring, performing microwave action for 3h, standing and ageing the product for 18h, and placing the product into a muffle furnace at 550 ℃ for calcination for 3h after suction filtration, washing and drying to obtain a nano composite oxide;
S2: dispersing the nano composite oxide in a potassium hydroxide solution with the concentration of 3mol/L, stirring for 10min, transferring to a reaction kettle, reacting for 12h at 95 ℃, centrifuging the product after the reaction is finished, alternately washing with distilled water and absolute ethyl alcohol for several times to neutrality, and drying for 2h at 80 ℃ to obtain the nano oxide;
S3: weighing 2g of the nano oxide, 50mL of ethanol, 50mL of deionized water and 5mL of concentrated ammonia water, placing the materials in a three-neck flask, performing ultrasonic dispersion for 2h, adding 20g of tetraethyl orthosilicate, continuously stirring for reaction for 12h, heating to 80 ℃, refluxing for 4h, and drying to obtain the nano oxide;
the preparation method of the mixed injection composition for carbon dioxide flooding in the embodiment comprises the following steps:
weighing 0.5g of sodium alginate, 1.5g of silicon-based cellulose, 15g of nano-composite and 83g of deionized water according to a formula, and uniformly mixing and stirring to obtain the sodium alginate.
Example 4
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as in example 3;
The method for preparing the nanocomposite in this example is different from that in example 3 in that:
S1: weighing 1g of polystyrene powder, 100mL of methanol and 50mL of deionized water, placing the materials into a flask, performing ultrasonic dispersion for 0.5h, heating to 60 ℃, adding 80mL of 30% ammonia water, 32g of magnesium nitrate and 12g of aluminum nitrate, uniformly mixing and stirring, performing microwave action for 3h, standing and ageing the product for 18h, and placing the product into a muffle furnace at 550 ℃ for calcination for 3h after suction filtration, washing and drying to obtain a nano composite oxide;
the rest of the procedure is the same as in example 3;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 3.
Example 5
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as in example 3;
The method for preparing the nanocomposite in this example is different from that in example 3 in that:
s1: weighing 1g of polystyrene powder, 100mL of methanol and 50mL of deionized water, placing the materials into a flask, performing ultrasonic dispersion for 0.5h, heating to 60 ℃, adding 80mL of 30% ammonia water, 25g of magnesium nitrate and 8g of aluminum nitrate, uniformly mixing and stirring, performing microwave action for 3h, standing and ageing the product for 18h, and placing the product into a muffle furnace at 550 ℃ for calcination for 3h after suction filtration, washing and drying to obtain a nano composite oxide;
the rest of the procedure is the same as in example 3;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 3.
Example 6
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as in example 5;
the method for preparing the nanocomposite in this example is different from that in example 5 in that:
S3: weighing 2g of the nano oxide, 50mL of ethanol, 50mL of deionized water and 5mL of concentrated ammonia water, placing the materials in a three-neck flask, performing ultrasonic dispersion for 2h, adding 50g of tetraethyl orthosilicate, continuously stirring for reacting for 12h, heating to 80 ℃, refluxing for 4h, and drying to obtain the nano oxide;
The rest of the procedure is the same as in example 5;
The method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 5.
Example 7
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as in example 5;
the method for preparing the nanocomposite in this example is different from that in example 5 in that:
s3: weighing 2g of the nano oxide, 50mL of ethanol, 50mL of deionized water and 5mL of concentrated ammonia water, placing the materials in a three-neck flask, performing ultrasonic dispersion for 2h, adding 38g of tetraethyl orthosilicate, continuously stirring for reaction for 12h, heating to 80 ℃, refluxing for 4h, and drying to obtain the nano oxide;
The rest of the procedure is the same as in example 5;
The method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 5.
Example 8
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as in example 7;
the preparation method of the nanocomposite in the embodiment comprises the following steps:
s1: weighing 1g of polystyrene powder, 100mL of methanol and 50mL of deionized water, placing the materials into a flask, performing ultrasonic dispersion for 0.5h, heating to 60 ℃, adding 80mL of 30% ammonia water, 25g of magnesium nitrate and 8g of aluminum nitrate, uniformly mixing and stirring, performing microwave action for 3h, standing and ageing the product for 18h, and placing the product into a muffle furnace at 550 ℃ for calcination for 3h after suction filtration, washing and drying to obtain a nano composite oxide;
S2: dispersing the nano composite oxide in a potassium hydroxide solution with the concentration of 3mol/L, stirring for 10min, transferring to a reaction kettle, reacting for 12h at 95 ℃, centrifuging the product after the reaction is finished, alternately washing with distilled water and absolute ethyl alcohol for several times to neutrality, and drying for 2h at 80 ℃ to obtain the nano oxide;
S3: weighing 2g of the nano oxide, 50mL of ethanol, 50mL of deionized water and 5mL of concentrated ammonia water, placing the nano oxide, the ethanol, the 50mL of deionized water and the 5mL of concentrated ammonia water in a three-neck flask, performing ultrasonic dispersion for 2h, adding 38g of tetraethyl orthosilicate, continuously stirring and reacting for 12h, heating to 80 ℃, refluxing for 4h, and drying to obtain the modified nano oxide;
s4: weighing 5g of the modified nano oxide and 200mL of deionized water, placing the mixture into a three-neck flask, performing ultrasonic dispersion for 2h, adding 1g of N, N-dimethyl-1, 4-butanediamine, stirring and reacting for 8h, adding 2g of 1, 4-dibromobutane, heating to 80 ℃, reacting for 4h, and drying to obtain a quaternary ammonium salt mixture;
S5: weighing 10g of the quaternary ammonium salt mixture and 300mL of deionized water, placing the mixture into a flask, uniformly mixing, adding 23g of sodium octadecylsulfonate, stirring for 24 hours at 60 ℃, and drying the product to obtain the product;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 7.
Example 9
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as that in example 8;
the method for preparing the nanocomposite in this example is different from that in example 8 in that:
s4: weighing 5g of the modified nano oxide and 200mL of deionized water, placing the mixture into a three-neck flask, performing ultrasonic dispersion for 2h, adding 3g of N, N-dimethyl ethylenediamine, stirring and reacting for 16h, adding 5g of 1, 3-dichloropropane, heating to 95 ℃, reacting for 2h, and drying to obtain a quaternary ammonium salt mixture;
S5: weighing 10g of the quaternary ammonium salt mixture and 300mL of deionized water, placing the mixture into a flask, uniformly mixing, adding 23g of sodium stearyl sulfonate, stirring for 12 hours at 80 ℃, and drying the product to obtain the product;
the rest of the procedure is the same as in example 8;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 8.
Example 10
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as that in example 8;
the method for preparing the nanocomposite in this example is different from that in example 8 in that:
S4: weighing 5g of the modified nano oxide and 200mL of deionized water, placing the mixture into a three-neck flask, performing ultrasonic dispersion for 2h, adding 2g of N, N-dimethyl-1, 3-propanediamine, stirring and reacting for 16h, adding 3g of 1, 3-dibromopropane, heating to 90 ℃, reacting for 3h, and drying to obtain a quaternary ammonium salt mixture;
s5: weighing 10g of the quaternary ammonium salt mixture and 300mL of deionized water, placing the mixture into a flask, uniformly mixing, adding 23g of sodium stearyl sulfonate, stirring for 15h at 70 ℃, and drying the product to obtain the product;
the rest of the procedure is the same as in example 8;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 8.
Example 11
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as that in example 10;
the method for preparing the nanocomposite in this example is different from that in example 10 in that:
S5: weighing 10g of the quaternary ammonium salt mixture and 300mL of deionized water, placing the mixture into a flask, uniformly mixing, adding 42g of sodium dodecyl sulfate, stirring for 15h at 70 ℃, and drying the product to obtain the product;
the rest of the procedure is the same as in example 10;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 10.
Example 12
The weight percentage composition of the mixed injection composition for carbon dioxide flooding in this example is the same as that in example 10;
the method for preparing the nanocomposite in this example is different from that in example 10 in that:
S5: weighing 10g of the quaternary ammonium salt mixture and 300mL of deionized water, placing the mixture into a flask, uniformly mixing, adding 34g of sodium hexadecyl sulfonate, stirring for 15h at 70 ℃, and drying the product to obtain the product;
the rest of the procedure is the same as in example 10;
the method for preparing the co-injection composition for carbon dioxide flooding in this example is the same as in example 10.
Comparative example
Comparative example 1
The mixed injection composition for carbon dioxide flooding in the comparative example comprises the following components in percentage by weight: sodium alginate 0.3%, silicon-based cellulose 1.2%, and water in balance;
The preparation method of the mixed injection composition for carbon dioxide flooding in the comparative example comprises the following steps:
weighing 0.3g of sodium alginate, 1.2g of silicon-based cellulose and 98.5g of deionized water according to a formula, and uniformly mixing and stirring to obtain the sodium alginate.
Comparative example 2
The mixed injection composition for carbon dioxide flooding in the comparative example comprises the following components in percentage by weight: sodium alginate 0.3%, silicon-based cellulose 1.2%, sodium hexadecyl sulfonate 10% and water in balance;
The preparation method of the mixed injection composition for carbon dioxide flooding comprises the following steps:
weighing 0.3g of sodium alginate, 1.2g of silicon-based cellulose, 10g of sodium hexadecyl sulfonate and 88.5g of deionized water according to a formula, and uniformly mixing and stirring to obtain the sodium alginate.
Performance test
The detection method comprises the following steps:
1. interfacial tension test with crude oil
When the supercritical carbon dioxide interfacial tensiometer is used for measuring the interfacial tension of the displacement fluid and crude oil of a certain block of Daqing oilfield by taking pure carbon dioxide as the displacement fluid and taking the mixed injection compositions for carbon dioxide flooding of examples 1-12 and comparative examples 1-2 and carbon dioxide as the displacement fluid in cooperation, the measurement result is shown in the following table 1 of the figure 1:
TABLE 1 Daqing oilfield crude oil properties at a block
2. Crude oil recovery test
The crude oil recovery ratio under the conditions of 76 ℃ and 25MPa is measured by adopting a tubule displacement experiment matching device, and the specific test method is as follows:
① Taking a field crude oil sample of a certain block of a Daqing oilfield, preparing formation oil according to the high-pressure physical parameters of the formation oil, and measuring the high-pressure physical parameters of the formation oil;
② Heating the tubule at constant temperature, evacuating, pressing the crude oil sample into the tubule model by using a constant pressure pump, stopping pumping when pumping 2PV, and recording the volume of the crude oil injected into the coil;
③ Boosting to above saturation pressure, performing constant-speed displacement at a speed of 0.45mL/min, starting to test the oil-gas ratio when an oil-gas section appears at the outlet end, and closing the outlet end of the oil-gas kettle after the saturation oil-gas is completed when the calculated oil-gas ratio is 38.1 m/t;
④ Injecting the mixed injection composition for carbon dioxide flooding of examples 1-12 and comparative examples 1-2 with a mass fraction of 1% of crude oil in the form of a slug, after the injection, performing constant-speed displacement by using carbon dioxide at a speed of 0.25mL/min, recording oil production, gas production and the like every 0.1PV, and stopping the experiment when the displacement reaches 1.2 PV;
⑤ Setting a control group, namely, only using carbon dioxide to perform constant-speed displacement at a speed of 0.25mL/min during displacement, recording oil production, gas production and the like every 0.1PV, stopping experiments when the displacement reaches 1.2PV, and not injecting the mixed injection composition for carbon dioxide flooding of examples 1-12 and comparative examples 1-2, wherein the mass fraction of the crude oil is 1% in the form of a slug;
The results of the crude oil recovery test are shown in figure 2.
Analysis of results
As can be seen from comparing the data of comparative examples 1-2 and examples 1-3 in fig. 1 and 2 and observing experimental phenomena, the co-injection composition for carbon dioxide flooding and carbon dioxide flooding can greatly improve the recovery ratio of crude oil, effectively improve the 'fingering' phenomenon of carbon dioxide in flooding, and improve the sweep efficiency, thereby improving the recovery ratio of crude oil; in addition, the mixed injection composition for carbon dioxide flooding can reduce the interfacial tension of the displacement fluid and crude oil to a certain extent, improve the wetting effect and improve the recovery ratio of the crude oil.
As can be seen from comparing the data of examples 3-5 of fig. 1 and 2, increasing the magnesium oxide content of the nanocomposite is beneficial to increasing the recovery of crude oil, probably because the magnesium oxide can provide more alkaline sites, is beneficial to adsorption of carbon dioxide, and increases the sweep efficiency of the displacement fluid, thereby increasing the recovery of crude oil.
As can be seen by comparing the data of examples 5-7 of fig. 1 and 2, the low surface energy materials and the hydrophilic groups on the surface of the nanocomposite are beneficial to enhance oil recovery, possibly because of the reduced surface tension and hydrophilic groups of the nanocomposite, to facilitate the displacement of the oil into the core pores.
As can be seen by comparing the data of examples 7-12 of fig. 1 and 2, the interaction between the positive and negative charges in the nanocomposite is beneficial to reducing the interfacial tension of the displacement fluid and the crude oil, and improving the recovery of the crude oil.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (10)
1. A co-injection composition for carbon dioxide flooding, comprising the following components in weight percent: sodium alginate 0.3-0.5%, silicon-based cellulose 1.2-1.5%, nano-composite 10-17%, and water in balance;
the preparation method of the nano-composite comprises the following steps:
S1: dispersing polystyrene powder in methanol water solution, heating to 50-60 ℃, adding ammonia water, magnesium nitrate and aluminum nitrate, uniformly mixing, performing microwave action for 2-3 hours, standing and aging the product for 18-24 hours, and performing suction filtration, washing, drying and calcination to obtain a nano composite oxide;
S2: dispersing the nano composite oxide in a strong alkali solution, stirring for 5-10min, reacting for 6-24h at 90-105 ℃, centrifuging, washing and drying the product to obtain the nano oxide;
S3: dispersing the nano oxide in ethanol water solution, adding concentrated ammonia water and tetraethyl orthosilicate, stirring for reaction for 8-15h, heating to 65-90 ℃, refluxing for 2-6h, and drying to obtain the nano oxide.
2. The co-injection composition for carbon dioxide flooding according to claim 1, wherein in step S1, the mass ratio of the polystyrene powder, magnesium nitrate, aluminum nitrate is 1 (16-32): 5-12.
3. The co-injection composition for carbon dioxide flooding according to claim 1, wherein in step S2, the strong alkali solution is 3mol/L sodium hydroxide solution or 3mol/L potassium hydroxide solution.
4. The co-injection composition for carbon dioxide flooding according to claim 1, wherein in step S3, the mass ratio of the nano-oxide to tetraethyl orthosilicate is 1 (10-25).
5. The co-injection composition for carbon dioxide flooding of claim 1, wherein the nanocomposite is modified by a method comprising the steps of:
1) Dispersing the nano-composite in water, adding diamine compound, stirring and reacting for 8-16h, adding dihalogenated hydrocarbon, heating to 80-95 ℃, reacting for 2-4h, and drying to obtain quaternary ammonium salt mixture;
2) Dispersing the quaternary ammonium salt mixture in water, adding anionic surfactant, stirring at 60-80deg.C for 12-24 hr, and drying.
6. The co-injection composition for carbon dioxide flooding of claim 5, wherein in step 1), the diamine compound is one of N, N-dimethylethylenediamine, N-dimethyl-1, 3-propylenediamine, and N, N-dimethyl-1, 4-butanediamine; the dihalogenated hydrocarbon is one of 1, 3-dibromopropane, 1, 3-dichloropropane and 1, 4-dibromobutane.
7. The co-injection composition for carbon dioxide flooding according to claim 5, wherein in step 1), the mass ratio of the nanocomposite, the diamine compound, and the dihalogenated hydrocarbon is 1 (0.2 to 0.6): 0.4 to 1.
8. The co-injection composition for carbon dioxide flooding of claim 5, wherein in step 2), the anionic surfactant is one of sodium dodecyl sulfonate, sodium hexadecyl sulfonate, and sodium octadecyl sulfonate.
9. The co-injection composition for carbon dioxide flooding according to claim 5, wherein in step 2), the mass ratio of the quaternary ammonium salt mixture to the anionic surfactant is 1 (2.3-4.2).
10. A method of preparing a co-injection composition for carbon dioxide flooding according to any one of claims 1 to 9, comprising the steps of:
and weighing sodium alginate, silicon-based cellulose, nano-composite and water according to a formula, and uniformly mixing to obtain the composite.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107353886A (en) * | 2017-08-03 | 2017-11-17 | 西南石油大学 | A nanocomposite material for preventing CO2 gas channeling in tight oil reservoirs and its preparation method |
| CN108003349A (en) * | 2017-11-21 | 2018-05-08 | 中国石油大学(华东) | A kind of preparation method of pressure break siloxane polymer supercritical carbon dioxide thickener |
| US20210115324A1 (en) * | 2019-05-09 | 2021-04-22 | Southwest Petroleum University | Insatiability emulsification and viscosity system with controlled viscosity and its application in water-driven reservoir |
| CN114381253A (en) * | 2022-03-24 | 2022-04-22 | 中国石油大学(华东) | A kind of thixotropic strengthening foam system and preparation method thereof |
| CN114574185A (en) * | 2022-03-17 | 2022-06-03 | 河南大学 | Quaternary composite oil displacement system based on modified nano-silica and preparation method thereof |
| CN115725209A (en) * | 2023-01-05 | 2023-03-03 | 曹阳 | Nano composite coating and preparation method thereof |
| CN116478675A (en) * | 2023-03-29 | 2023-07-25 | 遵义师范学院 | Efficient compound oil displacement agent and preparation method thereof |
-
2024
- 2024-07-22 CN CN202410977413.9A patent/CN118516099B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107353886A (en) * | 2017-08-03 | 2017-11-17 | 西南石油大学 | A nanocomposite material for preventing CO2 gas channeling in tight oil reservoirs and its preparation method |
| CN108003349A (en) * | 2017-11-21 | 2018-05-08 | 中国石油大学(华东) | A kind of preparation method of pressure break siloxane polymer supercritical carbon dioxide thickener |
| US20210115324A1 (en) * | 2019-05-09 | 2021-04-22 | Southwest Petroleum University | Insatiability emulsification and viscosity system with controlled viscosity and its application in water-driven reservoir |
| CN114574185A (en) * | 2022-03-17 | 2022-06-03 | 河南大学 | Quaternary composite oil displacement system based on modified nano-silica and preparation method thereof |
| CN114381253A (en) * | 2022-03-24 | 2022-04-22 | 中国石油大学(华东) | A kind of thixotropic strengthening foam system and preparation method thereof |
| CN115725209A (en) * | 2023-01-05 | 2023-03-03 | 曹阳 | Nano composite coating and preparation method thereof |
| CN116478675A (en) * | 2023-03-29 | 2023-07-25 | 遵义师范学院 | Efficient compound oil displacement agent and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 刘蕾: "X区块低渗透油藏CO2泡沫体系的研制与评价", 中国优秀硕士学位论文电子期刊网 工程科技Ⅰ辑, vol. 2024, no. 02, 15 February 2024 (2024-02-15), pages 1 - 84 * |
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