CN110439517A - A kind of flooding method suitable for heavy crude reservoir - Google Patents
A kind of flooding method suitable for heavy crude reservoir Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 172
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 96
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 96
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 96
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 96
- 239000002245 particle Substances 0.000 claims abstract description 83
- 239000000839 emulsion Substances 0.000 claims abstract description 75
- 239000006260 foam Substances 0.000 claims abstract description 53
- 239000003921 oil Substances 0.000 claims abstract description 51
- 239000004094 surface-active agent Substances 0.000 claims abstract description 30
- 229920000642 polymer Polymers 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 17
- 239000004088 foaming agent Substances 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims description 113
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 235000019198 oils Nutrition 0.000 claims description 50
- 239000008367 deionised water Substances 0.000 claims description 42
- 239000012188 paraffin wax Substances 0.000 claims description 40
- 238000002360 preparation method Methods 0.000 claims description 35
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- 238000004140 cleaning Methods 0.000 claims description 30
- 239000002105 nanoparticle Substances 0.000 claims description 30
- 230000000694 effects Effects 0.000 claims description 23
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- 229910021641 deionized water Inorganic materials 0.000 claims description 22
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 22
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 19
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 15
- 239000008346 aqueous phase Substances 0.000 claims description 14
- 239000004519 grease Substances 0.000 claims description 14
- SNGREZUHAYWORS-UHFFFAOYSA-N perfluorooctanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F SNGREZUHAYWORS-UHFFFAOYSA-N 0.000 claims description 13
- 229910020489 SiO3 Inorganic materials 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 12
- -1 alkylbenzene sulfonate Chemical class 0.000 claims description 9
- 239000003208 petroleum Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 230000029936 alkylation Effects 0.000 claims description 7
- 238000005804 alkylation reaction Methods 0.000 claims description 7
- 238000009835 boiling Methods 0.000 claims description 7
- 239000007822 coupling agent Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 235000019441 ethanol Nutrition 0.000 claims description 7
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 7
- 229910052909 inorganic silicate Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 238000010792 warming Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000006071 cream Substances 0.000 claims description 4
- 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 description 3
- FEBUJFMRSBAMES-UHFFFAOYSA-N 2-[(2-{[3,5-dihydroxy-2-(hydroxymethyl)-6-phosphanyloxan-4-yl]oxy}-3,5-dihydroxy-6-({[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}methyl)oxan-4-yl)oxy]-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl phosphinite Chemical compound OC1C(O)C(O)C(CO)OC1OCC1C(O)C(OC2C(C(OP)C(O)C(CO)O2)O)C(O)C(OC2C(C(CO)OC(P)C2O)O)O1 FEBUJFMRSBAMES-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 229920002305 Schizophyllan Polymers 0.000 claims description 3
- 150000007942 carboxylates Chemical class 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 239000003502 gasoline Substances 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 3
- 239000008158 vegetable oil Substances 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- 229920001285 xanthan gum Polymers 0.000 claims description 3
- 229940082509 xanthan gum Drugs 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 239000003876 biosurfactant Substances 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims description 2
- 229920001732 Lignosulfonate Polymers 0.000 claims 1
- 239000010779 crude oil Substances 0.000 abstract description 13
- 238000011084 recovery Methods 0.000 abstract description 12
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 10
- 239000008187 granular material Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 8
- 230000001804 emulsifying effect Effects 0.000 description 6
- 229960004756 ethanol Drugs 0.000 description 6
- 239000006087 Silane Coupling Agent Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 229960000935 dehydrated alcohol Drugs 0.000 description 5
- 239000012467 final product Substances 0.000 description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 5
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000002122 magnetic nanoparticle Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000005491 wire drawing 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
- C09K8/584—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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Soft Magnetic Materials (AREA)
- Colloid Chemistry (AREA)
- Lubricants (AREA)
Abstract
The present invention relates to crude oil acquisition technique fields, disclose a kind of flooding method suitable for heavy crude reservoir.By Pickering emulsion system and foam system with Segment combination models alternating the displacement of reservoir oil 2-4 times, Pickering emulsion system and the total slug injection rate of foam system are 0.4-0.8PV；The emulsifier of foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent；The emulsifier of Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, surfactant and polymer.The present invention fits flooding method and is suitable for the crude oil that viscosity is lower than 5000mPas, is applicable in viscosity of crude wider range, and the recovery ratio of high viscosity heavy crude reservoir is greatly improved.
Description
Technical field
The present invention relates to crude oil acquisition technique fields, more particularly, to a kind of flooding method suitable for heavy crude reservoir.
Background technique
With the development of industry, the social required quantity of petroleum and the contradiction of petroleum resources wretched insufficiency are increasingly sharpened.How
More oil obtained are produced from developed field becomes research emphasis.With the development of science and technology some special oil reservoirs
It is more and more developed, such as low-permeability oil deposit, extra-low permeability oil reservoirs, high temperature and high salt oil deposit.The viscosity of flowable viscous crude is logical
It is often up to thousands of to tens of thousands of mPas and the fingering of water is be easy to cause, so as to cause nothing since water and viscous crude mobility ratio difference are too big
Imitate displacement and low recovery ratio.Exxon company proposes Pickering emulsion oil-extraction method earliest, and is used to exploitation viscosity in 20-
Viscous crude within the scope of 3000mPas.Prove that Pickering emulsion can carry out long-time note through indoor and field test
Enter, and can keep stable in flow process, significantly improves recovery ratio.Son etc. is also carried out using Pickering emulsion
The displacement of reservoir oil, while proposing that alternately injection has better oil displacement efficiency for lotion and water.But high concentration crude oil is deposited in these methods
In the low disadvantage of oil recovery factor.China Patent Publication No. CN101949282 discloses a kind of slag oil asphalt Emuision Sweep side
Residual oil or pitch are heated to flow regime by method, are configured certain density aqueous surfactant solution and are heated to 80 DEG C, then
The residual oil of flowable state or pitch are added according to the ratio in the surfactant solution of heat, stirring makes its emulsification, at the scene water drive oil
To 98% or more moisture content, it is subsequently injected into residual oil or bitumen emulsion carries out displacement, then subsequent waterflooding, but this slag oil asphalt is newborn
Shape liquid is only applicable to common heavy oil reservoir (viscosity of crude is less than 300mPa.s), and applicable viscosity of thickened oil range is relatively narrow, viscous for height
Degree heavy crude reservoir oil recovery factor then will be greatly reduced.
Summary of the invention
The present invention is provided a kind of suitable for viscous crude oil to overcome the problems, such as that prior art high concentration thick oil recovery ratio is low
The flooding method of hiding is lower than the crude oil of 5000mPas suitable for viscosity, is applicable in viscosity of crude wider range, and for high viscosity
The recovery ratio of heavy crude reservoir greatly improves.
To achieve the goals above, the invention adopts the following technical scheme: a kind of flooding method suitable for heavy crude reservoir,
By Pickering emulsion system and foam system with Segment combination models alternating the displacement of reservoir oil 2-4 times.
The present invention uses Pickering emulsion system and foam system alternately to inject core, cream with Segment combination models
Shape liquid system and foam system can be distributed in high viscosity viscous crude.On the one hand this peptizaiton inhibits low viscosity displacement of reservoir oil body
The fingering of system, so that spread effect is preferable；On the other hand since the drop being distributed in crude oil has excellent dilution to drop viscous crude
Viscous effect, can be greatly lowered the viscosity for the viscous crude that forward position is in contact, to improve the mobility of viscous crude.In addition, emulsion
There are also surfactants in continuous phase, and under the disturbance of flowing, viscous crude can form apparent wire drawing phenomenon, pass through this mechanism
Can be by emulsified viscous oil at oil-in-water emulsion droplet, and then improve displacement efficiency.Polymer in system can reduce subsequent
The mobility of water flow increases the swept volume of subsequent water flow.The recovery ratio of crude oil to viscosity of crude lower than 5000mPas has greatly
Width improves.
Preferably, the Pickering emulsion system and the total slug injection rate of foam system are 0.4-0.8PV.
Preferably, the emulsifier of the foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent.
Preferably, the preparation method of the foam system is the following steps are included: by foaming agent and foam stabilizer magnetic Nano
Fe3O4@SiO2Particle be added deionized water in, with 2000-5000r/min high-speed stirred 1-3min to get.
Preferably, the emulsifier of the Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, table
Face activating agent and polymer.
Preferably, the polymer be selected from polyacrylamide, xanthan gum, polyethylene glycol, sodium alginate, scleroglucan,
Any one of carboxymethyl cellulose.
Preferably, the surfactant is selected from petroleum carboxylate, petroleum sulfonate, heavy alkylbenzene sulfonate, wooden
Any one of plain sulfonate, biosurfactant.
Preferably, the oil is mutually selected from any one of kerosene, vegetable oil, white oil, gasoline, diesel oil.
Preferably, the preparation method of the magnetic Nano Fe3O4@SiO2 particle the following steps are included:
1)Fe3O4Nano particle preparation: sodium hydroxide solution is configured to by sodium hydroxide is soluble in water；By isometric FeCl3It is molten
Liquid and FeSO4Solution mixes to obtain molysite mixed solution；Sodium hydroxide solution is heated to 60-80 DEG C, is dropwise mixed molysite molten
Drop is added in sodium hydroxide solution, is stopped heating to solution blackening, is cooled to room temperature, the black product that separation reaction generates,
By washing, drying and obtaining Fe3O4Nano particle；
2)Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to colloidal solution, is heated to 40-60 DEG C,
Na is added dropwise into colloidal solution2SiO3Simultaneously H is added dropwise in solution simultaneously2SiO4It is 9-10 that solution, which controls pH, reacts 3-4h, is warming up to 80-
95 DEG C are reacted 1-2h again, and in magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, and are acted in magnet
Deionised water cleaning, vacuum drying obtain Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent being added in ethanol water and is hydrolyzed, is then added into hydrolyzate
Fe3O4@SiO2Particle is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, stirs cream at 70-80 DEG C
Change to obtain emulsion, be cooled to paraffin solidification, magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet with
The mixing of perfluoro caprylic acid solution, room temperature reaction, magnet act on lower ethyl alcohol cleaning, it is dry to get.
Preferably, the preparation method of the Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, ultrasound
It is uniformly dispersed；It takes oil to be added to the grease system that aqueous phase solution forms upper lower leaf, must be mixed as homogeneous is carried out in homogenizer
Uniform grease system, is stored at room temperature, then divide isolated oil mutually and water phase to get.
The present invention prepares Fe first with oxidation-reduction method3O4Nano particle, Fe3O4Nano particle can be right as emulsifier
Solution plays preferable emulsifying effectiveness.In addition the present invention utilizes Fe3O4Nano particle is that carrier passes through Na2SiO3Hydrolysis is in Fe3O4
Nano grain surface covering layer of silicon dioxide obtains Fe3O4@SiO2Particle, then to Fe3O4@SiO2Particle is alkylated place
Reason, makes inorganic Fe3O4@SiO2Particle surface loads amino active group, pungent with paraffin and perfluor respectively using amino active group
Acid reaction, is grafted to Fe for paraffin and perfluoro caprylic acid3O4@SiO2On particle surface, hydrophilic and oleophilic magnetic nanoparticle, magnetic are formed
Property nano particle, which configures, to form that emulsion is with good stability under the conditions of high temperature and high salt, keeps the displacement of reservoir oil of emulsion system
Effect.
Therefore, the invention has the following beneficial effects: (1) to be suitable for the crude oil that viscosity is lower than 5000mPas, is applicable in original
Oil viscosity wider range, and the recovery ratio of high viscosity heavy crude reservoir is greatly improved；(2) emulsion system has stronger
Stability can be suitably used for high temperature and high salt environment.
Specific embodiment
Below by specific embodiment, technical scheme is described further.
In the present invention, if not refering in particular to, used raw material and equipment etc. are commercially available or commonly used in the art,
Method in embodiment is unless otherwise instructed the conventional method of this field.
Embodiment 1
The preparation method of magnetic Nano Fe3O4@SiO2 particle the following steps are included:
1)Fe3O4Nano particle preparation: being 80g/L sodium hydroxide solution by the sodium hydroxide concentration soluble in water that is configured to；It will wait
The FeCl of volume3Solution and FeSO4Solution mixes to obtain molysite mixed solution, FeCl3Solution is FeCl3It is water-soluble with the mixing of HCl
Liquid, FeCl3Concentration is 2mol/L, and HCl concentration is 0.5mol/L；FeSO4Solution is FeSO4With the mixed aqueous solution of HCl；FeSO4
Concentration is 1mol/L；HCl concentration is 0.5mol/L；Sodium hydroxide solution is heated to 70 DEG C, dropwise drips molysite mixed solution
It is added in sodium hydroxide solution, molysite mixed solution additive amount is the 15wt% of sodium hydroxide solution, stops adding to solution blackening
Heat is cooled to room temperature, the black product that separation reaction generates, by washing, drying and obtaining Fe3O4Nano particle；
2)Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to concentration as 25g/L colloidal solution, heats
To 50 DEG C, it is 2mol/L Na that concentration is added dropwise into colloidal solution2SiO3Simultaneously concentration is added dropwise simultaneously as 0.4mol/LH in solution2SiO4
It is 9.5, Na that solution, which controls pH,2SiO3With Fe3O4The mass ratio of nano particle is 1:0.5, reacts 3h, is warming up to 90 DEG C and reacts again
1h, in magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, clear in magnet effect deionised water
It washes, vacuum drying obtains Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent KH-550 is added in ethanol water and is hydrolyzed, amino silane coupling
Agent KH-550 and dehydrated alcohol volume ratio are 1:30, and Fe is then added into hydrolyzate3O4@SiO2Particle, Fe3O4@SiO2Particle
Initial concentration in hydrolyzate is 10g/L, is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated
Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, is alkylated Fe3O4@SiO2
Concentration of the grain in mixed liquor is 30g/L, and concentration of the paraffin in mixed liquor is 100g/L, and stirring and emulsifying obtains emulsus at 75 DEG C
Liquid, is cooled to paraffin solidification, and magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet and perfluoro caprylic acid
The mass ratio of solution mixing, paraffin emulsion droplet and perfluoro caprylic acid is 1:0.1, and room temperature reaction, magnet acts on lower ethyl alcohol cleaning, dry,
To obtain the final product.
The emulsifier of foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent lauryl sodium sulfate；Foam
The preparation method of system is the following steps are included: by foaming agent lauryl sodium sulfate and foam stabilizer magnetic Nano Fe3O4@SiO2
Grain is added in deionized water, and the concentration of surfactant is 0.2g/L, magnetic Nano Fe3O4@SiO2Granule density is 2g/L, with
3000r/min high-speed stirred 2min to get.
The emulsifier of Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, surfactant petroleum
Carboxylate and polymer poly acrylamide.The preparation method of Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, water phase
Magnetic Nano Fe in solution3O4@SiO2Granule density is 2g/L, and the concentration of surfactant is 0.2g/L, and the concentration of polymer is
1000mg/L；Ultrasonic disperse is uniform；Take kerosene that the grease system that aqueous phase solution forms upper lower leaf, the body of water phase and oily phase is added
Product, as the grease system that progress homogeneous must be uniformly mixed in homogenizer, is stored at room temperature than being 1:4, then divides isolated oil
Mutually and water phase to get.
Suitable for the flooding method of heavy crude reservoir, by Pickering emulsion system and foam system with slug combination side
Formula replaces the displacement of reservoir oil 3 times, and (first Pickering emulsion system drives, and then foam system drives, then Pickering emulsion system
It drives)；Pickering emulsion system and the total slug injection rate of foam system are 0.6PV；Pickering emulsion system slug
Injection rate is 0.4PV, and foam system slug injection rate is 0.2PV.
Embodiment 2
The preparation method of magnetic Nano Fe3O4@SiO2 particle the following steps are included:
1)Fe3O4Nano particle preparation: being 80g/L sodium hydroxide solution by the sodium hydroxide concentration soluble in water that is configured to；It will wait
The FeCl of volume3Solution and FeSO4Solution mixes to obtain molysite mixed solution, FeCl3Solution is FeCl3It is water-soluble with the mixing of HCl
Liquid, FeCl3Concentration is 2mol/L, and HCl concentration is 0.5mol/L；FeSO4Solution is FeSO4With the mixed aqueous solution of HCl；FeSO4
Concentration is 1mol/L；HCl concentration is 0.5mol/L；Sodium hydroxide solution is heated to 75 DEG C, dropwise drips molysite mixed solution
It is added in sodium hydroxide solution, molysite mixed solution additive amount is the 15wt% of sodium hydroxide solution, stops adding to solution blackening
Heat is cooled to room temperature, the black product that separation reaction generates, by washing, drying and obtaining Fe3O4Nano particle；
2)Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to concentration as 25g/L colloidal solution, heats
To 55 DEG C, it is 2mol/L Na that concentration is added dropwise into colloidal solution2SiO3Simultaneously concentration is added dropwise simultaneously as 0.4mol/LH in solution2SiO4
It is 10, Na that solution, which controls pH,2SiO3With Fe3O4The mass ratio of nano particle is 1:0.5, reacts 4h, is warming up to 95 DEG C and reacts again
1h, in magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, clear in magnet effect deionised water
It washes, vacuum drying obtains Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent KH-550 is added in ethanol water and is hydrolyzed, amino silane coupling
Agent KH-550 and dehydrated alcohol volume ratio are 1:30, and Fe is then added into hydrolyzate3O4@SiO2Particle, Fe3O4@SiO2Particle
Initial concentration in hydrolyzate is 10g/L, is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated
Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, is alkylated Fe3O4@SiO2
Concentration of the grain in mixed liquor is 30g/L, and concentration of the paraffin in mixed liquor is 100g/L, and stirring and emulsifying obtains emulsus at 80 DEG C
Liquid, is cooled to paraffin solidification, and magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet and perfluoro caprylic acid
The mass ratio of solution mixing, paraffin emulsion droplet and perfluoro caprylic acid is 1:0.1, and room temperature reaction, magnet acts on lower ethyl alcohol cleaning, dry,
To obtain the final product.
The emulsifier of foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent lauryl sodium sulfate；Foam
The preparation method of system is the following steps are included: by foaming agent lauryl sodium sulfate and foam stabilizer magnetic Nano Fe3O4@SiO2
Grain is added in deionized water, and the concentration of surfactant is 0.3g/L, magnetic Nano Fe3O4@SiO2Granule density is 2g/L, with
4000r/min high-speed stirred 3min to get.
The emulsifier of Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, surfactant petroleum
Sulfonate and polymer xanthan gum.The preparation method of Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, water phase
Magnetic Nano Fe in solution3O4@SiO2Granule density is 2.5g/L, and the concentration of surfactant is 0.3g/L, the concentration of polymer
For 1200mg/L；Ultrasonic disperse is uniform；Take vegetable oil that the grease system that aqueous phase solution forms upper lower leaf, water phase and oily phase is added
Volume ratio be 1:4, as the grease system that must be uniformly mixed of homogeneous is carried out in homogenizer, be stored at room temperature, then separation is precipitated
Oil mutually and water phase to get.
Suitable for the flooding method of heavy crude reservoir, by Pickering emulsion system and foam system with slug combination side
Formula replaces 4 (Pickering emulsion system drives-foam system drive-Pickering emulsion system drive-foam system of the displacement of reservoir oil
It drives)；Pickering emulsion system and the total slug injection rate of foam system are 0.8PV；Pickering emulsion system slug
Injection rate is 0.4PV, and foam system slug injection rate is 0.4PV.
Embodiment 3
The preparation method of magnetic Nano Fe3O4@SiO2 particle the following steps are included:
1)Fe3O4Nano particle preparation: being 80g/L sodium hydroxide solution by the sodium hydroxide concentration soluble in water that is configured to；It will wait
The FeCl of volume3Solution and FeSO4Solution mixes to obtain molysite mixed solution, FeCl3Solution is FeCl3It is water-soluble with the mixing of HCl
Liquid, FeCl3Concentration is 2mol/L, and HCl concentration is 0.5mol/L；FeSO4Solution is FeSO4With the mixed aqueous solution of HCl；FeSO4
Concentration is 1mol/L；HCl concentration is 0.5mol/L；Sodium hydroxide solution is heated to 65 DEG C, dropwise drips molysite mixed solution
It is added in sodium hydroxide solution, molysite mixed solution additive amount is the 15wt% of sodium hydroxide solution, stops adding to solution blackening
Heat is cooled to room temperature, the black product that separation reaction generates, by washing, drying and obtaining Fe3O4Nano particle；
2)Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to concentration as 25g/L colloidal solution, heats
To 45 DEG C, it is 2mol/L Na that concentration is added dropwise into colloidal solution2SiO3Simultaneously concentration is added dropwise simultaneously as 0.4mol/LH in solution2SiO4
It is 9, Na that solution, which controls pH,2SiO3With Fe3O4The mass ratio of nano particle is 1:0.5, reacts 3h, is warming up to 85 DEG C and reacts 1h again,
In magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, and is cleaned in magnet effect deionised water,
Vacuum drying obtains Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent KH-550 is added in ethanol water and is hydrolyzed, amino silane coupling
Agent KH-550 and dehydrated alcohol volume ratio are 1:30, and Fe is then added into hydrolyzate3O4@SiO2Particle, Fe3O4@SiO2Particle
Initial concentration in hydrolyzate is 10g/L, is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated
Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, is alkylated Fe3O4@SiO2
Concentration of the grain in mixed liquor is 30g/L, and concentration of the paraffin in mixed liquor is 100g/L, and stirring and emulsifying obtains emulsus at 70 DEG C
Liquid, is cooled to paraffin solidification, and magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet and perfluoro caprylic acid
The mass ratio of solution mixing, paraffin emulsion droplet and perfluoro caprylic acid is 1:0.1, and room temperature reaction, magnet acts on lower ethyl alcohol cleaning, dry,
To obtain the final product.
The emulsifier of foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent lauryl sodium sulfate；Foam
The preparation method of system is the following steps are included: by foaming agent lauryl sodium sulfate and foam stabilizer magnetic Nano Fe3O4@SiO2
Grain is added in deionized water, and the concentration of surfactant is 0.15g/L, magnetic Nano Fe3O4@SiO2Granule density is 1g/L, with
3000r/min high-speed stirred 2min to get.
The emulsifier of Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, surfactant weight alkane
Base benzene sulfonate and polymer polyethylene glycol.The preparation method of Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, water phase
Magnetic Nano Fe in solution3O4@SiO2Granule density is 1g/L, and the concentration of surfactant is 0.15g/L, the concentration of polymer
For 800mg/L；Ultrasonic disperse is uniform；Take white oil that the grease system that aqueous phase solution forms upper lower leaf, water phase and oily phase is added
Volume ratio is 1:3, as the grease system that progress homogeneous must be uniformly mixed in homogenizer, is stored at room temperature, then divides isolated
It is oily mutually and water phase to get.
Suitable for the flooding method of heavy crude reservoir, by Pickering emulsion system and foam system with slug combination side
Formula replaces the displacement of reservoir oil 2 times (the first Pickering emulsion system displacement of reservoir oil, then the foam system displacement of reservoir oil)；Pickering emulsion system
It is 0.4PV with the total slug injection rate of foam system；Pickering emulsion system slug injection rate is 0.2PV, foam system section
Plug injection rate is 0.2PV.
Embodiment 4
The preparation method of magnetic Nano Fe3O4@SiO2 particle the following steps are included:
1)Fe3O4Nano particle preparation: being 80g/L sodium hydroxide solution by the sodium hydroxide concentration soluble in water that is configured to；It will wait
The FeCl of volume3Solution and FeSO4Solution mixes to obtain molysite mixed solution, FeCl3Solution is FeCl3It is water-soluble with the mixing of HCl
Liquid, FeCl3Concentration is 2mol/L, and HCl concentration is 0.5mol/L；FeSO4Solution is FeSO4With the mixed aqueous solution of HCl；FeSO4
Concentration is 1mol/L；HCl concentration is 0.5mol/L；Sodium hydroxide solution is heated to 80 DEG C, dropwise drips molysite mixed solution
It is added in sodium hydroxide solution, molysite mixed solution additive amount is the 15wt% of sodium hydroxide solution, stops adding to solution blackening
Heat is cooled to room temperature, the black product that separation reaction generates, by washing, drying and obtaining Fe3O4Nano particle；
2)Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to concentration as 25g/L colloidal solution, heats
To 60 DEG C, it is 2mol/L Na that concentration is added dropwise into colloidal solution2SiO3Simultaneously concentration is added dropwise simultaneously as 0.4mol/LH in solution2SiO4
It is 10, Na that solution, which controls pH,2SiO3With Fe3O4The mass ratio of nano particle is 1:0.5, reacts 4h, is warming up to 95 DEG C and reacts again
1h, in magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, clear in magnet effect deionised water
It washes, vacuum drying obtains Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent KH-550 is added in ethanol water and is hydrolyzed, amino silane coupling
Agent KH-550 and dehydrated alcohol volume ratio are 1:30, and Fe is then added into hydrolyzate3O4@SiO2Particle, Fe3O4@SiO2Particle
Initial concentration in hydrolyzate is 10g/L, is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated
Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, is alkylated Fe3O4@SiO2
Concentration of the grain in mixed liquor is 30g/L, and concentration of the paraffin in mixed liquor is 100g/L, and stirring and emulsifying obtains emulsus at 80 DEG C
Liquid, is cooled to paraffin solidification, and magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet and perfluoro caprylic acid
The mass ratio of solution mixing, paraffin emulsion droplet and perfluoro caprylic acid is 1:0.1, and room temperature reaction, magnet acts on lower ethyl alcohol cleaning, dry,
To obtain the final product.
The emulsifier of foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent lauryl sodium sulfate；Foam
The preparation method of system is the following steps are included: by foaming agent lauryl sodium sulfate and foam stabilizer magnetic Nano Fe3O4@SiO2
Grain is added in deionized water, and the concentration of surfactant is 0.3g/L, magnetic Nano Fe3O4@SiO2Granule density is 3g/L, with
5000r/min high-speed stirred 1min to get.
The emulsifier of Pickering emulsion system includes that magnetic Nano Fe3O4@SiO2 particle, surfactant are wooden
Plain sulfonate and polymer sodium alginate.The preparation method of Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, water phase
Magnetic Nano Fe in solution3O4@SiO2Granule density is 3g/L, and the concentration of surfactant is 0.3g/L, and the concentration of polymer is
1500mg/L；Ultrasonic disperse is uniform；Take gasoline that the grease system that aqueous phase solution forms upper lower leaf, the body of water phase and oily phase is added
Product, as the grease system that progress homogeneous must be uniformly mixed in homogenizer, is stored at room temperature than being 1:5, then divides isolated oil
Mutually and water phase to get.
Suitable for the flooding method of heavy crude reservoir, by Pickering emulsion system and foam system with slug combination side
Formula replaces 4 (Pickering emulsion system drives-foam system drive-Pickering emulsion system drive-foam system of the displacement of reservoir oil
It drives)；Pickering emulsion system and the total slug injection rate of foam system are 0.8PV；Pickering emulsion system slug
Injection rate is 0.4PV, and foam system slug injection rate is 0.4PV.
Embodiment 5
The preparation method of magnetic Nano Fe3O4@SiO2 particle the following steps are included:
1)Fe3O4Nano particle preparation: being 80g/L sodium hydroxide solution by the sodium hydroxide concentration soluble in water that is configured to；It will wait
The FeCl of volume3Solution and FeSO4Solution mixes to obtain molysite mixed solution, FeCl3Solution is FeCl3It is water-soluble with the mixing of HCl
Liquid, FeCl3Concentration is 2mol/L, and HCl concentration is 0.5mol/L；FeSO4Solution is FeSO4With the mixed aqueous solution of HCl；FeSO4
Concentration is 1mol/L；HCl concentration is 0.5mol/L；Sodium hydroxide solution is heated to 60 DEG C, dropwise drips molysite mixed solution
It is added in sodium hydroxide solution, molysite mixed solution additive amount is the 15wt% of sodium hydroxide solution, stops adding to solution blackening
Heat is cooled to room temperature, the black product that separation reaction generates, by washing, drying and obtaining Fe3O4Nano particle；
2)Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to concentration as 25g/L colloidal solution, heats
To 40 DEG C, it is 2mol/L Na that concentration is added dropwise into colloidal solution2SiO3Simultaneously concentration is added dropwise simultaneously as 0.4mol/LH in solution2SiO4
It is 9, Na that solution, which controls pH,2SiO3With Fe3O4The mass ratio of nano particle is 1:0.5, reacts 3h, is warming up to 80 DEG C and reacts 2h again,
In magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, and is cleaned in magnet effect deionised water,
Vacuum drying obtains Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent KH-550 is added in ethanol water and is hydrolyzed, amino silane coupling
Agent KH-550 and dehydrated alcohol volume ratio are 1:30, and Fe is then added into hydrolyzate3O4@SiO2Particle, Fe3O4@SiO2Particle
Initial concentration in hydrolyzate is 10g/L, is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated
Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, is alkylated Fe3O4@SiO2
Concentration of the grain in mixed liquor is 30g/L, and concentration of the paraffin in mixed liquor is 100g/L, and stirring and emulsifying obtains emulsus at 70 DEG C
Liquid, is cooled to paraffin solidification, and magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet and perfluoro caprylic acid
The mass ratio of solution mixing, paraffin emulsion droplet and perfluoro caprylic acid is 1:0.1, and room temperature reaction, magnet acts on lower ethyl alcohol cleaning, dry,
To obtain the final product.
The emulsifier of foam system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent lauryl sodium sulfate；Foam
The preparation method of system is the following steps are included: by foaming agent lauryl sodium sulfate and foam stabilizer magnetic Nano Fe3O4@SiO2
Grain is added in deionized water, and the concentration of surfactant is 0.1g/L, magnetic Nano Fe3O4@SiO2Granule density is 0.5g/L,
With 2000r/min high-speed stirred 3min to get.
The emulsifier of Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, surfactant biology
Surfactant and polymer scleroglucan.The preparation method of Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, water phase
Magnetic Nano Fe in solution3O4@SiO2Granule density is 0.5g/L, and the concentration of surfactant is 0.1g/L, the concentration of polymer
For 500mg/L；Ultrasonic disperse is uniform；Take diesel oil that the grease system that aqueous phase solution forms upper lower leaf, water phase and oily phase is added
Volume ratio is 1:3, as the grease system that progress homogeneous must be uniformly mixed in homogenizer, is stored at room temperature, then divides isolated
It is oily mutually and water phase to get.
Suitable for the flooding method of heavy crude reservoir, by Pickering emulsion system and foam system with slug combination side
Formula replaces the displacement of reservoir oil 2 times (the first Pickering emulsion system displacement of reservoir oil, then the foam system displacement of reservoir oil)；Pickering emulsion system
It is 0.4PV with the total slug injection rate of foam system；Pickering emulsion system slug injection rate is 0.3PV, foam system section
Plug injection rate is 0.1PV.
Experimental test:
The rock core that permeability is about 1000mD is chosen, is vacuumized, water flooding is saturated, claims weight in wet base, calculates core porosity；Rock core dress
Enter clamper, connecting pipeline, displacement crude oil makes irreducible water, aging 30h.With stratum water drive for the crude oil in rock core, until outlet
End loses fuel-displaced, records the oil pump capacity of outlet, calculates waterflood recovery efficiency factor；The magnetic Pickering cream of the certain slug size of metaideophone
Shape liquid, after injection finishes, the foam system of the certain slug size of metaideophone, then water flooding is infused into rock core, until outlet end not
See oil, stop injection, record the oil pump capacity of outlet, calculates magnetism Pickering emulsion and improve oil recovery factor.
The displacement of reservoir oil is carried out by the crude oil that the available present invention of experimental data is up to 4000mPas to viscosity, crude oil is improved and adopts
Yield is maintained at 20% or more, it was demonstrated that the present invention greatly improves the recovery ratio of high viscosity heavy crude reservoir, is suitable for high viscosity
Oil recovering.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
It is right according to the technical essence of the invention for the equivalent embodiment of equivalent variations, but without departing from the technical solutions of the present invention
Any simple modification, equivalent change and modification made by above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of flooding method suitable for heavy crude reservoir, which is characterized in that by Pickering emulsion system and foam system
With Segment combination models alternating the displacement of reservoir oil 2-4 times.
2. a kind of flooding method suitable for heavy crude reservoir according to claim 1, which is characterized in that described
Pickering emulsion system and the total slug injection rate of foam system are 0.4-0.8PV.
3. a kind of flooding method suitable for heavy crude reservoir according to claim 1, which is characterized in that the foams
The emulsifier of system includes magnetic Nano Fe3O4@SiO2Particle and foaming agent.
4. a kind of flooding method suitable for heavy crude reservoir according to claim 1 or 3, which is characterized in that the foam
The preparation method of system is the following steps are included: by foaming agent and foam stabilizer magnetic Nano Fe3O4@SiO2Deionized water is added in particle
In, with 2000-5000r/min high-speed stirred 1-3min to get.
5. a kind of flooding method suitable for heavy crude reservoir according to claim 1, which is characterized in that described
The emulsifier of Pickering emulsion system includes magnetic Nano Fe3O4@SiO2 particle, surfactant and polymer.
6. a kind of flooding method suitable for heavy crude reservoir according to claim 5, which is characterized in that the polymer choosing
From any one of polyacrylamide, xanthan gum, polyethylene glycol, sodium alginate, scleroglucan, carboxymethyl cellulose.
7. a kind of flooding method suitable for heavy crude reservoir according to claim 5, which is characterized in that the surface-active
Agent appointing in petroleum carboxylate, petroleum sulfonate, heavy alkylbenzene sulfonate, lignosulfonates, biosurfactant
It is a kind of.
8. a kind of flooding method suitable for heavy crude reservoir according to claim 1 or 5, which is characterized in that described
The preparation method of Pickering emulsion system the following steps are included:
Magnetic Nano Fe3O4@SiO2 particle, surfactant, polymer and deionized water are mixed into composition aqueous phase solution, ultrasound
It is uniformly dispersed；It takes oil to be added to the grease system that aqueous phase solution forms upper lower leaf, must be mixed as homogeneous is carried out in homogenizer
Uniform grease system, is stored at room temperature, then divide isolated oil mutually and water phase to get.
9. a kind of flooding method suitable for heavy crude reservoir according to claim 8, which is characterized in that the oil is mutually selected from
Any one of kerosene, vegetable oil, white oil, gasoline, diesel oil.
10. a kind of flooding method suitable for heavy crude reservoir according to claim 3 or 5, which is characterized in that the magnetism
The preparation method of nanometer Fe_3O_4@SiO2 particle the following steps are included:
1) Fe3O4Nano particle preparation: sodium hydroxide solution is configured to by sodium hydroxide is soluble in water；By isometric FeCl3It is molten
Liquid and FeSO4Solution mixes to obtain molysite mixed solution；Sodium hydroxide solution is heated to 60-80 DEG C, is dropwise mixed molysite molten
Drop is added in sodium hydroxide solution, is stopped heating to solution blackening, is cooled to room temperature, the black product that separation reaction generates,
By washing, drying and obtaining Fe3O4Nano particle；
2) Fe3O4@SiO2Particle preparation: by Fe3O4Nano particle, which is added to the water, is configured to colloidal solution, is heated to 40-60 DEG C, to
Na is added dropwise in colloidal solution2SiO3Simultaneously H is added dropwise in solution simultaneously2SiO4It is 9-10 that solution, which controls pH, reacts 3-4h, is warming up to 80-95
DEG C 1-2h is reacted again, in magnet effect deionised water cleaning, the particle after cleaning, which is added in boiling water, to be boiled, under magnet effect
Deionized water cleaning, vacuum drying obtain Fe3O4@SiO2Particle；
3) alkylation is handled: amino silicane coupling agent being added in ethanol water and is hydrolyzed, is then added into hydrolyzate
Fe3O4@SiO2Particle is stirred to react, the washes of absolute alcohol under magnet effect, so dry that be alkylated Fe3O4@SiO2Particle；
4) it is grafted: Fe will be alkylated3O4@SiO2The mixed liquor of particle, paraffin and deionized water mixing, stirs cream at 70-80 DEG C
Change to obtain emulsion, be cooled to paraffin solidification, magnet acts on deionised water cleaning, dry paraffin emulsion droplet；By paraffin emulsion droplet with
The mixing of perfluoro caprylic acid solution, room temperature reaction, magnet act on lower ethyl alcohol cleaning, it is dry to get.
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| CN112266775A (en) * | 2020-10-23 | 2021-01-26 | 西南石油大学 | Preparation of in-situ nano emulsifier and oil reservoir application method |
| US11618847B2 (en) | 2020-10-23 | 2023-04-04 | Southwest Petroleum University | Methods for preparing and applying a nano emulsifier |
| CN112796717A (en) * | 2021-04-12 | 2021-05-14 | 西安石油大油气科技有限公司 | Air foam flooding method for reducing gas channeling in underground thickened oil exploitation and foaming agent thereof |
| CN112796717B (en) * | 2021-04-12 | 2021-07-09 | 西安石油大油气科技有限公司 | Air foam flooding method for reducing gas channeling in underground thickened oil exploitation and foaming agent thereof |
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