CN103937478A - Preparation method of nanofluid for improving oil recovery - Google Patents
Preparation method of nanofluid for improving oil recovery Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000002105 nanoparticle Substances 0.000 claims abstract description 23
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 21
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 239000004094 surface-active agent Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- 239000011858 nanopowder Substances 0.000 claims abstract description 6
- 238000001291 vacuum drying Methods 0.000 claims abstract description 6
- 239000002904 solvent Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 65
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 239000013543 active substance Substances 0.000 claims description 9
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 8
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 8
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 8
- 239000005642 Oleic acid Substances 0.000 claims description 8
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 8
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 8
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 8
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- RSKGMYDENCAJEN-UHFFFAOYSA-N hexadecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCCCCCC[Si](OC)(OC)OC RSKGMYDENCAJEN-UHFFFAOYSA-N 0.000 claims description 6
- 238000010907 mechanical stirring Methods 0.000 claims description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 229910000077 silane Inorganic materials 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000002202 Polyethylene glycol Substances 0.000 abstract 3
- 238000009835 boiling Methods 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 235000019441 ethanol Nutrition 0.000 abstract 1
- 239000011259 mixed solution Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 46
- 239000002245 particle Substances 0.000 description 13
- 239000000126 substance Substances 0.000 description 12
- 239000002585 base Substances 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 229920001030 Polyethylene Glycol 4000 Polymers 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- WKEXHTMMGBYMTA-UHFFFAOYSA-N trimethyl propyl silicate Chemical compound CCCO[Si](OC)(OC)OC WKEXHTMMGBYMTA-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001239 high-resolution electron microscopy Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011943 nanocatalyst Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 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
- 239000010426 asphalt Substances 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229960003511 macrogol Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- -1 silicon-dioxide-ethylene oxide Chemical compound 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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)
- Lubricants (AREA)
Abstract
The invention discloses a preparation method of a nanofluid for improving oil recovery. The preparation method comprises the following steps: taking 2.0-4.0g of nanopowder, adding 60-80mL of deionized water to the nanopowder and carrying out ultrasonic dispersion at a room temperature for 30-60 minutes; dissolving 2.0g of a silane coupling agent in absolute ethyl alcohol; mixing the nano-base solution with the ethanol solution of the silane coupling agent in a three-neck boiling flask, heating while stirring to the range of 70 to 75 DEG C, reacting for 4-6 hours, filtering, washing by using an anhydrous solvent a plurality of times, and drying in a vacuum drying box at 60-70 DEG C for 12 hours to obtain modified nanoparticles; putting 0.1-0.5g of nanoparticles in the three-neck boiling flask, adding 200-300mL of water, heating to the range of 60-75 DEG C by use of a water bath, mixing a surfactant with PEG (Poly Ethylene Glycol), adding 100mL of mixed solution of the surfactant and the PEG, mechanically stirring for 6-8 hours, washing the stirred dispersion 2-3 times, adjusting the pH value to the range of 8-9, and adding deionized water to 1L, thereby obtaining the water-based nanofluid.
Description
?
Technical field
The present invention relates to petrochemical industry, particularly relate to a kind of nano-fluid for improving oil recovery factor method.
Background technology
In many oil reservoirs, about 2/3rds oil can not be exploited by conventional production method in the world.Therefore,, in mature oilfield, improve recovery efficiency technique (EOR) and have very large potentiality.It is relatively economical that water drive improves recovery ratio method, but mainly early production period, improving water drive in recovery ratio method is comparatively reasonably to select.Water drive is produced after time water drive, can select to add some chemical agents, as alkali, tensio-active agent and polymkeric substance increase the efficiency of water drive process.These chemical substances are joined in injected water, and the wettability of rock surface becomes more hydrophily.The injection of polymkeric substance can increase the viscosity of injected water, improves the sweep efficiency of heterogeneous body and viscosity oil reservoir.Tensio-active agent mainly contains for reducing interfacial tension, thereby makes to act on the oil flow in matrix pores because of capillary force constraint.
The main difficulty that uses polymkeric substance in oil reservoir is chemical degradation and the thermal destruction of polymkeric substance.In addition, typical polymers molecular weight is that 1000 ~ 2,500 ten thousand polymkeric substance are difficult to be injected in low-permeability oil deposit.In addition, high temperature and high salt make surfactant flooding process challenging, cause damage and form obstruction to surfactant oil displacement efficiency, and alkali add problems such as causing occurring in field test the fouling of producing well pit shaft is serious, Produced Liquid difficult treatment.In addition, traditional tensio-active agent is also comparatively responsive to hydrolysis.Therefore, be necessary that exploitation energy heatproof, salt tolerant in reservoir have the novel material of economic benefit.
Nanotechnology can act on more efficient, more cheap, raising oil recovery (EOR) method of more environmental protection.The diameter of conventional reservoir pore is generally all at micron order; Therefore, nano particle can flow therein.In addition, a key property of nano particle is surface effects, and along with particle diameter reduces, the surface-area of particulate sharply becomes greatly, and in the time that the particle diameter of nanoparticle reaches 10nm, specific surface area is 90m
2/ g, when particle diameter is 5nm, specific surface area is 180 m
2/ g, when particle diameter drops to 2nm, specific surface area is surged to 450 m
2/ g.Very large specific surface area causes surface atom number to increase sharply, the atom that is positioned at particle surface accounts for sizable ratio, the serious mismatch of key state, cause the surface energy that Atomic coordinate is not enough and high, there are many active centre, surface step and roughness increase, and the chemical valence of chemical non-equilibrium, non-integer coordination appears in surface, and this causes the chemical property of nanometer system and Chemical Equilibria Systems to occur very big difference.
Nano particle due to surface-area and volume ratio larger, thereby increased surperficial energy.The adsorption of the active substance on solid surface can change the wettability of surface energy and system.Thereby greatly reduce oil water interfacial tension, make to inject fluid at hole displacement process, make crude oil be easy to peel off into little oil droplet, and driven liquid displacement out.In addition, nano-fluid particle has temporary transient ponding to the little duct of reservoir, thereby expand swept volume, make the mother oil displacement that do not fed through in hole out, reach the object that improves recovery ratio, step-down augmented injection, therefore, carry out the research work of nano-fluid raising oil recovery factor field produces is had to direct production meaning, particularly some low permeability oil fields are had more to practical significance.
There is scholar to develop a kind of metal (W, Ni, and Mo) nanometer colloid particle-catalytic agent being scattered in water and carry out pitch exploitation.Have nanocatalyst and carry out comparing result without the asphalt viscosity under nano particle effect to show, nanocatalyst is effective to the viscosity that reduces pitch.The people such as Ponnapati have found water-soluble silicon-dioxide-ethylene oxide type nanometer polymer.Although these nano-complexes do not produce high viscosity in definite concentration, author thinks that the polymkeric substance of higher molecular weight and higher grafting density can improve viscosity.
The people such as Ju carry out the adsorption test of lipophobia and hydrophilic polysilicon nanometer particle and verify that the wettability of sandstone surface changes.Observe wetting ability nano silicon particles and can improve oil recovery factor approximately 9% at size range 10-500 nm compared with pure water, it is effective that polysilicon nanometer particle improves recovery efficiency technique to water drive.
The people such as Hendraningrat study and use wetting ability Nano particles of silicon dioxide, on improving the impact of oil recovery factor, comprise the size of nanoparticle and concentration, initial wettability and the isoparametric impact of temperature.Result shows, by improving temperature, reduces nanoparticle size and reduces nano-fluid input rate and can improve oil recovery factor.In addition, also realize rock from middle wetting regime, obtained the highest oil recovery factor and oil displacement efficiency.And find that oil recovery factor and nano-fluid concentration are not directly proportional, when namely nano-fluid concentration increases, recover the oil and strengthen, but when concentration is during lower than a threshold value, recovery ratio can reduce.
The people such as Karimi have studied the impact of the wettability modification of zirconium white nano-fluid on carbonate reservoir by experiment.Experimental result shows, nano-fluid can by the wettability of rock, from strong oil, wet to become strong water wet.
People's studying alumina nano-fluids such as Giraldo are changing the wettability of Sandstone Cores and the validity of the wettability of induction oleophylic.Research shows, the wettability that nano-fluid can change Sandstone Cores makes rock, and from oil, wet to become water wet.
Summary of the invention
For the deficiencies in the prior art, the present invention adopts following technical scheme:
For improving the preparation method of nano-fluid for oil recovery factor, comprise the steps:
1) prepare nanometer base fluid: get the nano-powder of 2.0-4.0g, add deionized water 60-80 mL, the ultrasonic dispersion of room temperature 30-60min;
2) separately get silane coupling agent 2.0g and dissolve dehydrated alcohol 30-60mL;
3) modified Nano particle: nanometer base fluid is put into there-necked flask with silane coupling agent ethanolic soln and mix, be heated to while stirring 70-75 DEG C, after reaction 4-6h, filter with anhydrous solvent washing several, be placed in 60-70 DEG C of vacuum drying oven and be dried after 12h, obtain the nanoparticle of modification;
4) water-based nano-fluid: get 0.1-0.5g nanoparticle and put into there-necked flask, 200-300mL adds water, warming-in-water is to 60-75 DEG C, tensio-active agent is mixed with PEG, and add its mixing solutions 100mL, mechanical stirring 6-8h, dispersion liquid after stirring is washed 2-3 time, again pH value is adjusted to 8-9, and adds deionized water to 1L, obtain water-based nano-fluid.
Described nano-powder is: nano-TiO
2, zinc oxide, nanometer Fe
3o
4, nanometer SiO
2at least one in powder.
Described silane coupling agent is selected: Silane coupling reagent KH-570, silane coupling agent KH-56 or hexadecyl Trimethoxy silane.
Concrete, the described nano-TiO of preparing
2adopt Silane coupling reagent KH-570 (γ-methacryloxypropyl trimethoxy silane); Prepare nano zine oxide nano-fluid and adopt silane coupling agent KH-560 (γ-glycidyl ether propoxy-Trimethoxy silane); Preparation nanometer Fe
3o
4adopt silane coupling agent KH-560 (γ-glycidyl ether propoxy-Trimethoxy silane); Preparation nanometer SiO
2fluid adopts hexadecyl Trimethoxy silane.
Described anhydrous solvent is: dehydrated alcohol or anhydrous n-hexane.
Described tensio-active agent is: Sodium dodecylbenzene sulfonate, oleic acid are received or sodium alkylarysulfonate.
Concrete, the described nano-TiO of preparing
2adopt surfactant Sodium dodecylbenzene sulfonate; Preparing nano zine oxide nano-fluid employing surfactant is that oleic acid is received; Preparation nanometer Fe
3o
4it is that oleic acid is received that nano-fluid adopts surfactant; Preparation nanometer SiO
2it is sodium alkylarysulfonate that nano-fluid adopts surfactant.
For improving the using method of nano-fluid for oil recovery factor, by the nano-fluid of preparation, be 8.2-9.5cm in length, diameter is 2.5cm, rate of permeation is 1.42-1.51 μ m
2synthetic core on carry out indoor physical simulation oil displacement experiment;
Rock core is put in clamper, vacuumizes 6 hours, saturation simulation local water, measures rock core saturation ratio and rate of permeation; Oil expelling water, measures initial oil saturation; Constant temperature 12h at 45 DEG C of thermostatic drying chamber set temperatures, first carry out water displacing oil to moisture 92-93%, recording water drive oil displacement efficiency is 41.5-42.8%, the nano-fluid of metaideophone 0.3pV again, then follow-up water drive outlet water ratio is 98-100%, and the oil displacement efficiency that records nano-fluid has improved 13.5-16.8% than water drive water drive oil displacement efficiency.
Technical scheme of the present invention exists under high temperature and high salt condition oil displacement efficiency poor for the oil-displacing agent containing tensio-active agent, polymkeric substance in prior art, the deficiency of corrosion and incrustation injury etc. that the high and alkali of working concentration brings stratum and oil well, can obtain good dispersity, stable nano-fluid by technical scheme provided by the invention, the method technique is simple, mild condition, raw material availability is high, cost is low, be easy to industrialization.
Brief description of the drawings
Fig. 1 detects through high-resolution electron microscopy (HRTEM), the TEM figure of the water-base nano TiO2 fluid of the town particle size of catalyst surface between 20-50nm.
Embodiment
Below by specific embodiment, the present invention is described in detail.
embodiment 1
Get the nano-TiO of 2.0g
2powder, adds deionized water 60 mL, and the ultrasonic dispersion of room temperature 30min separately gets Silane coupling reagent KH-570 (γ-methacryloxypropyl trimethoxy silane) 2.0g and dissolves dehydrated alcohol 40mL, by nano-TiO
2base fluid mixes with silane coupling agent KH-560 ethanolic soln, puts into there-necked flask, is heated to while stirring 70 DEG C of temperature, for filtering absolute ethanol washing for several times, be placed on dry in 60 DEG C of vacuum drying ovens after, obtain the TiO of modification
2nanoparticle.
Get 0.5g TiO
2nanoparticle is put into there-necked flask, 300mL adds water, warming-in-water to 70 DEG C, add 2g Sodium dodecylbenzene sulfonate and 2g PEG-4000 mixing solutions 100mL, mechanical stirring 8h, washs the dispersion liquid after stirring three times, then pH value is adjusted to 8, and add deionized water to 1L, obtain TiO
2water-based nano-fluid.
Fig. 1 is water-base nano TiO
2the TEM figure of fluid, as seen from Figure 1, nano-TiO
2particle still can keep single particle not reunite at intensive state like this, illustrates that the nanoparticle of preparation can reach the object of not reuniting.
embodiment 2
Get the nanometer Zinc oxide powder of 2.0g, add deionized water 80 mL, the ultrasonic dispersion of room temperature 60min, separately get silane coupling agent KH-560 (γ-glycidyl ether propoxy-Trimethoxy silane) 2.0g and dissolve dehydrated alcohol 30mL, nano zine oxide base fluid is mixed with silane coupling agent KH-560 ethanolic soln, put into there-necked flask, stir on limit, limit is heated to 70 DEG C of temperature, after reaction 4h, filter with absolute ethanol washing several, be placed in 60 DEG C of vacuum drying ovens dry after, obtain the zinc oxide nano-particle of modification.
Get 0.5g Zinc oxide nanoparticle and put into there-necked flask, add deionized water 200mL, warming-in-water to 70 DEG C, adding 1g oleic acid receives and 1g PEG-4000 mixing solutions 100mL, mechanical stirring 8 h, wash the dispersion liquid after stirring three times, then pH value are adjusted to 8, and add deionized water to 1L, obtain the water base nano-fluid of zinc oxide.
embodiment 3
Get nanometer Fe
3o
4powder 4g, adds deionized water 80 mL, and the ultrasonic dispersion of room temperature 40min separately gets silane coupling agent KH-560 (γ-glycidyl ether propoxy-Trimethoxy silane) 2g and dissolves dehydrated alcohol 30mL, by nanometer Fe
3o
4base fluid mixes with silane coupling agent KH-560 ethanolic soln to be put into there-necked flask and stirs, and after 70 DEG C of water-bath 8h, vacuum filtration obtains solid, puts into constant temperature blast drying oven dry 12 hours, obtains the Fe of modification
3o
4particle.
Get 0.1g nanometer Fe
3o
4particle is put into there-necked flask, 300mL adds water, warming-in-water to 60 DEG C, adding 1g oleic acid receives and 1g PEG-4000 (macrogol) mixing solutions 100mL, mechanical stirring 6h, washs the dispersion liquid after stirring three times, then pH value is adjusted to 8, and add deionized water to 100mL, obtain Fe
3o
4water-based nano-fluid.
embodiment 4
Get the nanometer SiO of 2.0g
2powder, adds deionized water 60 mL, and the ultrasonic dispersion of room temperature 30min separately gets silane coupling agent (hexadecyl Trimethoxy silane) 2.0g and dissolves dehydrated alcohol 60mL, by nanometer SiO
2base fluid mixes with silane coupling agent (hexadecyl Trimethoxy silane) ethanolic soln, put into there-necked flask, be heated to while stirring 75 DEG C of temperature, filter with anhydrous n-hexane washing several, be placed in 70 DEG C of vacuum drying ovens dry after, obtain the SiO of modification
2nanoparticle.
Get 0.5g SiO
2nanoparticle is put into there-necked flask, the 300mL that adds water, warming-in-water to 75 DEG C, add 2g sodium alkylarysulfonate and 2g PEG-4000 mixing solutions 100mL, mechanical stirring 8h, washs the dispersion liquid after stirring 2 times, again pH value is adjusted to 9, and adds deionized water to 1L, obtain SiO
2water-based nano-fluid.
embodiment 5
By the nano-fluid of increased substantially recovery ratio synthetic in embodiment 1, be 8.2cm in length, diameter is 2.5cm, rate of permeation is 1.42 μ m
2synthetic core on carry out indoor physical simulation oil displacement experiment.First water drive, to moisture 93%, record water drive and can improve oil recovery factor 42.6%, then the nano-fluid of metaideophone 0.3pV (volume of voids), and water drive, to moisture 98%, record on water drive basis and can improve oil recovery factor 16.8% again.
embodiment 6
By the nano-fluid of increased substantially recovery ratio synthetic in embodiment 2, be 8.6cm in length, diameter is 2.5cm, rate of permeation is 1.48 μ m
2synthetic core on carry out indoor physical simulation oil displacement experiment.First water drive, to moisture 92%, record water drive and can improve oil recovery factor 41.5%, then the nano-fluid of metaideophone 0.3pV (volume of voids), and water drive, to moisture 100%, record on water drive basis and can improve oil recovery factor 14.9% again.
embodiment 7
By the nano-fluid of increased substantially recovery ratio synthetic in embodiment 3, be 8.7cm in length, diameter is 2.5cm, rate of permeation is 1.51 μ m
2synthetic core on carry out indoor physical simulation oil displacement experiment.First water drive, to moisture 93%, record water drive and can improve oil recovery factor 41.5%, then the nano-fluid of metaideophone 0.3pV (volume of voids), and water drive, to moisture 98%, record on water drive basis and can improve oil recovery factor 14.3% again.
embodiment 8
By the nano-fluid of increased substantially recovery ratio synthetic in embodiment 4, be 9.5cm in length, diameter is 2.5cm, rate of permeation is 1.5 μ m
2synthetic core on carry out indoor physical simulation oil displacement experiment.First water drive, to moisture 92%, record water drive and can improve oil recovery factor 42.8 %, then the nano-fluid of metaideophone 0.3pV (volume of voids), and water drive, to moisture 98%, record on water drive basis and can improve oil recovery factor 13.5% again.
Claims (8)
1. for improving the preparation method of nano-fluid for oil recovery factor, it is characterized in that: comprise the steps:
1) prepare nanometer base fluid: get the nano-powder of 2.0-4.0g, add deionized water 60-80 mL, the ultrasonic dispersion of room temperature 30-60min;
2) separately get silane coupling agent 2.0g and dissolve dehydrated alcohol 30-60mL;
3) modified Nano particle: nanometer base fluid is put into there-necked flask with silane coupling agent ethanolic soln and mix, be heated to while stirring 70-75 DEG C, after reaction 4-6h, filter with anhydrous solvent washing several, be placed in 60-70 DEG C of vacuum drying oven and be dried after 12h, obtain the nanoparticle of modification;
4) water-based nano-fluid: get 0.1-0.5g nanoparticle and put into there-necked flask, 200-300mL adds water, warming-in-water is to 60-75 DEG C, tensio-active agent is mixed with PEG, and add its mixing solutions 100mL, mechanical stirring 6-8h, dispersion liquid after stirring is washed 2-3 time, again pH value is adjusted to 8-9, and adds deionized water to 1L, obtain water-based nano-fluid.
2. according to claim 1 a kind of for improving the preparation method of nano-fluid of oil recovery factor, it is characterized in that: described nano-powder is: nano-TiO
2, zinc oxide, nanometer Fe
3o
4, nanometer SiO
2at least one in powder.
3. according to claim 1 a kind of for improving the preparation method of nano-fluid of oil recovery factor, it is characterized in that: described silane coupling agent is selected: Silane coupling reagent KH-570, silane coupling agent KH-56 or hexadecyl Trimethoxy silane.
4. according to claim 2 a kind of for improving the preparation method of nano-fluid of oil recovery factor, it is characterized in that: the described nano-TiO of preparing
2adopt Silane coupling reagent KH-570; Prepare nano zine oxide nano-fluid and adopt silane coupling agent KH-560; Preparation nanometer Fe
3o
4adopt silane coupling agent KH-560; Preparation nanometer SiO
2fluid adopts hexadecyl Trimethoxy silane.
5. according to claim 1 a kind of for improving the preparation method of nano-fluid of oil recovery factor, it is characterized in that: described anhydrous solvent is: dehydrated alcohol or anhydrous n-hexane.
6. according to claim 1 a kind of for improving the preparation method of nano-fluid of oil recovery factor, it is characterized in that: described tensio-active agent is: Sodium dodecylbenzene sulfonate, oleic acid are received or sodium alkylarysulfonate.
7. according to claim 2 a kind of for improving the preparation method of nano-fluid of oil recovery factor, it is characterized in that: the described nano-TiO of preparing
2adopt surfactant Sodium dodecylbenzene sulfonate; Preparing nano zine oxide nano-fluid employing surfactant is that oleic acid is received; Preparation nanometer Fe
3o
4it is that oleic acid is received that nano-fluid adopts surfactant; Preparation nanometer SiO
2it is sodium alkylarysulfonate that nano-fluid adopts surfactant.
8. for improving the using method of nano-fluid for oil recovery factor, it is characterized in that:
By the nano-fluid of preparation, be 8.2-9.5cm in length, diameter is 2.5cm, rate of permeation is 1.42-1.51 μ m
2synthetic core on carry out indoor physical simulation oil displacement experiment;
Rock core is put in clamper, vacuumizes 6 hours, saturation simulation local water, measures rock core saturation ratio and rate of permeation; Oil expelling water, measures initial oil saturation; Constant temperature 12h at 45 DEG C of thermostatic drying chamber set temperatures, first carry out water displacing oil to moisture 92-93%, recording water drive oil displacement efficiency is 41.5-42.8%, the nano-fluid of metaideophone 0.3pV again, then follow-up water drive outlet water ratio is 98-100%, and the oil displacement efficiency that records nano-fluid has improved 13.5-16.8% than water drive water drive oil displacement efficiency.
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