CN113882841A - Nano-system composite CO2Method for improving oil well productivity through huff and puff - Google Patents
Nano-system composite CO2Method for improving oil well productivity through huff and puff Download PDFInfo
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- 239000003129 oil well Substances 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000000243 solution Substances 0.000 claims abstract description 66
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- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000010779 crude oil Substances 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000002105 nanoparticle Substances 0.000 claims abstract description 21
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 230000008021 deposition Effects 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 21
- 239000004094 surface-active agent Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 229910052681 coesite Inorganic materials 0.000 claims description 14
- 229910052906 cristobalite Inorganic materials 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052682 stishovite Inorganic materials 0.000 claims description 14
- 229910052905 tridymite Inorganic materials 0.000 claims description 14
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 11
- 229910052731 fluorine Inorganic materials 0.000 claims description 11
- 239000011737 fluorine Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 10
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 9
- 239000003607 modifier Substances 0.000 claims description 8
- -1 perfluorosiloxane Chemical class 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
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- 125000002091 cationic group Chemical group 0.000 claims description 2
- 239000003093 cationic surfactant Substances 0.000 claims description 2
- 238000012937 correction Methods 0.000 claims description 2
- 125000001153 fluoro group Chemical group F* 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims 1
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- 230000015572 biosynthetic process Effects 0.000 abstract description 4
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 23
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
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- GRVDJDISBSALJP-UHFFFAOYSA-N methyloxidanyl Chemical group [O]C GRVDJDISBSALJP-UHFFFAOYSA-N 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
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- 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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- 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
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- 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
- E21B43/164—Injecting CO2 or carbonated water
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Abstract
The invention discloses a nano-system composite CO2The method for improving the oil well productivity by huff and puff comprises the following steps: (1) injecting a nano solution slug: preparing water-based nano solution with solid content of 0.005-0.01%, and injecting the water-based nano solution into a stratum in the air by an oil well oil collar; (2) injection of liquid CO2Slug: mixing liquid CO2The slug is injected into the formation from the oil well casing annulus, and the injected CO2The mass ratio of the water-based nano solution to the mass of the water-based nano solution is (1.5-2.2): 1; (3) stopping injecting and soaking the well: to be liquefied CO2And after the injection is finished, closing the well and carrying out well stewing for 10-20 days. The nano-particles can be adsorbed on the surface of rock to change lipophilicity into lipophobicity, thereby effectively preventing deposition of asphaltene and greatly reducing CO2Damage to reservoir caused by asphaltene precipitation during "spittingAnd the fluidity of the crude oil is improved.
Description
Technical Field
The invention relates to the field of oil well production increase in the oil field development process, in particular to nano-system composite CO2Throughput and productivity of oil wells.
Background
The low-permeability oil reservoir has the characteristics of low porosity, low permeability, low natural productivity, no water injection, no production, and the like, and the carbon dioxide huff and puff is an effective yield increasing technology for the low-permeability oil reservoir aiming at the difficult problem of low-permeability oil field development. The carbon dioxide huff and puff oil extraction technology is characterized in that a certain amount of carbon dioxide is injected into an oil layer under a certain pressure, after the oil layer is stewed for a period of time, the viscosity of crude oil can be obviously reduced, the volume of the crude oil is expanded, the relative permeability of an oil phase is improved, and the yield of an oil well is improved.
At present, with the increasing of the extraction degree of each oil field, the serious stratum depletion and the serious gas channeling, the huff and puff effect of each old block is increasingly poor, although the effective rate of measures is increased year by year, the oil increment of a single well is reduced year by year, and the oil cost per ton is higher and higher. CO 22CO utilization for composite single well huff and puff2The synergistic effect of the additive and other chemical components can better play the roles of washing oil, reducing viscosity, changing wettability and supplementing formation energy, thereby achieving the purpose of improving the huff and puff effect and being paid more and more attention by petroleum workers.
CN 201410455336 discloses a microorganism and CO for heavy oil wells2The oil production method of the compound single well huff and puff meets the following conditions for the oil well suitable for the method: the oil well temperature is less than 100 ℃, the crude oil viscosity is less than 5000mPa.s, the formation water mineralization is less than 50000mg/L, and the permeability is more than 50 multiplied by 10-3μm2. Therefore, the method is not suitable for use at permeabilities < 50X 10-3μm2The reservoir layer is difficult to realize the yield increase of the low-permeability oil reservoir oil well, and has certain technical limitation.
CN105952425A discloses a chemical agent assisted CO2The method for raising recovery ratio of common heavy oil reservoir includes mixing chemical agent with CO2And the oil well can still keep higher oil recovery after multiple times of handling by taking the oil well and the oil well into consideration the synergistic effect of the oil well and the oil well. The chemical agent involved in the patent is a viscosity reducing chemical agent, and forms an oil-in-water emulsion with common thick oil, so that the oil-water interfacial tension is reduced, and the crude oil flow resistance during exploitation is reduced, but the relevant examples are in a laboratory stage, and the field application situation is not clarified.
Existing CO2The composite huff and puff method can effectively improve the productivity of a single oil well, but in CO2In the process of 'spitting', light components in the crude oil are easy to extract from an oil reservoir, and heavy components such as asphaltene in the crude oil are adsorbed on the surface of rock, so that the rock becomes oil wet, and the permeability is reduced. Researches prove that the nano particles have the capability of stabilizing asphaltene precipitation so as to prevent the nano particles from being adsorbed on the surface of rock, and in addition, the small size and the large specific surface area of the nano particles ensure that the nano particles have excellent performances in the aspects of changing rock wettability, reducing oil-water interfacial tension, emulsifying viscosity reduction and the like. Thus, the nanosystems complex the CO2The huff and puff technology has important significance for improving the huff and puff effect and improving the single well productivity.
Disclosure of Invention
The invention aims to solve the technical problem of providing nano-system composite CO2The invention relates to a method for improving oil well productivity by huff and puff, which combines a nano system and CO2Combined use, first injecting a slug of nano-solution into the well, followed by injection of CO2And (5) slugging, and stewing for a certain time after the injection is finished. The preposed nano solution can reduce the adhesion work of oil drops and the rock surface, the crude oil is stripped from the rock surface, meanwhile, the nano particles can be adsorbed on the rock surface and change lipophilicity into lipophobicity, the deposition of asphaltene is effectively prevented, and CO is greatly reduced2The damage of asphaltene precipitation to a reservoir stratum in the spitting process improves the fluidity of crude oil. In addition, the nano-solution can be mixed with subsequent CO2The slug has synergistic effect, exerts the effects of viscosity reduction, oil washing, dissolution expansion, extraction, stratum energy supplement and the like, and finally realizes the purpose of improving the productivity of a single well of the oil well.
The invention is realized by the following technical scheme:
nano-system composite CO2The method for improving the oil well productivity by huff and puff comprises the following steps:
(1) injecting a nano solution slug: preparing water-based nano solution with solid content of 0.005-0.01%, and injecting the water-based nano solution into a stratum in the air by an oil well oil collar;
(2) injection of liquid CO2Slug: mixing liquid CO2The slug is injected into the stratum by the oil well oil sleeve annulus, and liquid CO is injected2The mass ratio of the (ground liquid state) to the water-based nano solution is 1.5: 1-2.2: 1;
(3) stopping injecting and soaking the well: to be liquefied CO2And after the injection is finished, closing the well and carrying out well stewing for 10-20 days.
In the soaking process of the step, the nano particles are chemically bonded with the surface of the rock, have strong adsorption force, peel off crude oil from the surface of the rock, can perform coarse manufacturing on the surface of the wall of the rock hole by the nano particles to construct a micro-nano binary structure, and a modifier with low surface energy in a nano system is modified on the micro-nano binary structure to change the wettability of the rock in a near wellbore zone from lipophilicity to lipophilicity, reduce the oil-water seepage resistance and subsequently reduce the CO seepage resistance2The oil and the crude oil have the effects of dissolving and swelling, reducing viscosity and the like, and the mobility of the oil difficult to drive in the rock reservoir is improved.
(4) And (3) well opening production: and after the well soaking is finished, the oil well is opened for production. In the open flow process of the oil well, the oil well is adjusted to be an oleophobic near-wellbore zone, so that the deposition of heavy components such as asphaltene in crude oil can be effectively delayed, the fluidity of the crude oil is improved, and the CO is improved2The effect of throughput.
As a most preferred scheme, the water-based nano solution mainly comprises nano SiO2Particles, modifier, dispersant and water, wherein the nano SiO2The particles are nano-SiO prepared by a gas phase method2The particles, the modifier is fluorine-containing siloxane, the dispersant is fluorocarbon surfactant, and water-based nano solution with nano particle content of 0.005-0.01% is prepared.
As a most preferable scheme, the water-based nano solution comprises the following components in percentage by mass: nano meterSiO20.005-0.010% of particles, 1-5% of fluorine-containing siloxane, 0.1-0.5% of fluorocarbon surfactant and the balance of water.
As a most preferred solution, the size of the nanoparticle in the water-based nano solution is less than 20 nm. The nano particles with the size have good injectivity to a low-permeability reservoir, enter a pore throat with nano and micro-nano sizes, which cannot be entered by a traditional chemical agent, strip more crude oil from the surface of a rock, and adsorb the crude oil on the surface of the rock to form a micro-nano binary structure, and then a modifier is used for modifying a low-surface-energy substance on the surface of the rock, so that the wettability of the rock is changed, the deposition of asphaltene is effectively prevented, and the seepage capability of oil and water is improved.
As a most preferable scheme, the injection amount Q of the water-based nano solution in the step (1) is: q ═ pi R2HФβ；
In the formula: q-amount of injection of Nano solution, m3(ii) a R is the processing radius, m, the value range is 10-20 m; h, effective thickness of an oil well production layer, m; phi-average pore size of oil well producing zone,%; the beta-direction correction coefficient is dimensionless and has a value range of 0.8-1.0.
As a most preferable scheme, the injection amount of the water-based nano solution is 40-60 m3And d, adopting an injection mode of day injection and night stop until the nano solution spreads.
As a most preferable mode, CO injected in the step (2)2The mass ratio of the water-based nano solution to the mass of the water-based nano solution is 2:1, and the injection speed is 20-30 t/d. During injection, dynamic adjustment can be performed according to the actual injection pressure. If the pressure is lower, the injection amount can be increased, and the injection period can be shortened; if special conditions such as no injection or over-high injection pressure occur, the injection is stopped in time.
As a most preferred option, steps (1) - (4) may be repeated as desired.
As a most preferable scheme, the water-based nano solution comprises the following components in percentage by mass: nano SiO20.005% of particles, 3% of fluorine-containing siloxane, 0.3% of fluorocarbon surfactant and the balance of water.
As a most preferred embodiment of the present invention,the nano SiO2The particles are nano-SiO prepared by a gas phase method2Particles of SiO2The content is not less than 99.8%; the fluorine-containing siloxane is one of perfluorosiloxanes with end group methoxyl and carbon chain length of 4-6; the chain length of the carbon chain of the fluorocarbon surfactant is 6-10, the groups on the molecule of the fluorocarbon surfactant comprise 1-3 methoxyl groups or ethoxyl groups, the fluorocarbon surfactant is one or more of a cationic surfactant and an anionic surfactant, for example, the cationic fluorocarbon surfactant is one or more of Capstone ST110 and Capstone ST300 of the Coroman corporation, and the anionic fluorocarbon surfactant is one or more of Capstone FS-10, FS22, FS31, FS3100, FS50 and FS51 of the Coroman corporation.
As a most preferred solution, the water-based nano solution is prepared according to the following steps:
(1) respectively dropwise adding the fluorocarbon surfactant and the fluorine-containing siloxane into water, and mechanically stirring for 1h under the conditions of water bath at 50 ℃ and 300-2600 r/min.
(2) Mixing nano SiO2Dispersing the particles into the dispersion liquid by an ultrasonic dispersion method, and oscillating for 10 minutes under the action of ultrasonic waves to obtain the water-based nano solution.
Compared with the prior art, the invention has the following beneficial effects:
(1) nano system composite CO2The method for improving the productivity of the oil well by huff and puff can effectively solve the problem of the reduction of the oil production of a single well of the low-permeability oil reservoir.
(2) The particle size of the nano particles in the water-based nano solution is less than 20nm, and the water-based nano solution has good injectivity to a hypotonic reservoir.
(3) The nano particles are chemically bonded with the surface of the rock, so that the adsorption force is strong, the crude oil on the surface of the rock can be efficiently stripped, and the oil washing efficiency is improved.
(4) After the nano particles are adsorbed on the surface of rock, a micro-nano binary structure is formed, a modifier with low surface energy is modified, the wettability of a near-wellbore area is changed from lipophilicity to lipophobicity, and the seepage resistance of crude oil is reduced; meanwhile, the sedimentation rate of the asphaltene can be effectively delayed, so that CO is effectively avoided2During the process of spitting, the deposition of asphaltene in the near-wellbore area reduces the permeability of oil and water.
(5) Water-based nano-solution and subsequent CO2The slug has synergistic effect to realize the effects of viscosity reduction, dissolution expansion, extraction, stratum energy supplement and the like, and finally realize the purpose of improving the productivity of a single well of the oil well.
Drawings
FIG. 1 is a test curve of the distribution of nanoparticles in a water-based nano solution;
FIG. 2 is a comparison graph of a crude oil contaminated core (left side) and a core (right side) after being soaked in a water-based nano solution;
fig. 3 is a schematic diagram of oil contact angle of water-based nano solution after being adsorbed on rock.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The effective thickness of oil layer of certain oil field P8 well is 7.1m, average porosity is 25.4%, and average permeability is 16X 10-3μm2The oil layer temperature is 50 ℃, the oil layer pressure is 10.41MPa, and the ground crude oil density is 0.9319t/m3The viscosity of the crude oil at the surface is 765.52mPa.s, and the freezing point is 39 ℃.
The injection quantity Q of the nano solution is as follows: v is 3.14R2Hфβ＝3.14×7.12×10×0.254×0.8＝558m3Wherein: r takes 10 and beta takes 0.8. Calculating liquid CO according to gas-liquid ratio 2:12The injection amount was 1116 t.
The construction steps are as follows:
(1) preparing a water-based nano solution with the solid content of nano particles of 0.005 percent: the water-based nano solution comprises the following components in percentage by mass: 0.005% nano SiO2Granules, 3% containingFluorosilicone (perfluoro siloxane with end group of methoxyl and carbon chain length of 6), 0.3% fluorocarbon surfactant (fluorocarbon surfactant with carbon chain length of 8 and 3 methoxyl groups on the molecule), and the balance of water. As shown in figure 1, the nano SiO in the water-based nano solution2The average particle size of the particles was 18.09 nm.
The water-based nano solution is prepared by the following steps:
1) respectively dropwise adding the fluorocarbon surfactant and the fluorine-containing siloxane into water, and mechanically stirring for 1h under the conditions of water bath at 50 ℃ and 300-2600 r/min.
2) Mixing nano SiO2Dispersing the particles into the dispersion liquid by an ultrasonic dispersion method, and oscillating for 10 minutes under the action of ultrasonic waves to obtain the water-based nano solution.
(2) Injecting the water-based nano solution into the stratum through the oil sleeve annulus by using a pump truck, wherein the injection displacement is 60m3And d, injecting in a mode of day injection and night stop to enable the nano solution to fully act with the formation crude oil. The nanoparticles are chemically bonded with the surface of the rock in the soaking process of the step, the adsorption force is strong, crude oil is stripped from the surface of the rock, the nanoparticles can roughen the surface of the wall of the rock hole to form a micro-nano binary structure, a modifier with low surface energy in a nano system is modified on the micro-nano binary structure, the wettability of the rock in a near wellbore zone is changed from lipophilicity to lipophilicity, the oil-water seepage resistance is reduced, and subsequent CO is subjected to oil-water seepage resistance2The oil and the crude oil have the effects of dissolving and swelling, reducing viscosity and the like, and the mobility of the oil difficult to drive in the rock reservoir is improved. Fig. 2 is a comparison graph of a crude oil contaminated core (left side) and a core (right side) after the water-based nano solution is soaked, and fig. 3 is a schematic diagram of an oil contact angle of the water-based nano solution adsorbed on the rock.
(3) Injection of 1116t liquid CO2The injection displacement is 30 t/d.
(4) Stopping soaking for 20 days.
(5) And (5) well opening and production.
The oil well before the operation of a certain oil field P8 well produces 1.3t/d of liquid, 0.1t/d of oil and 94.2 percent of water. Implementation of nanosystem composite CO2P8 well fluid production after stimulation andthe oil yield is obviously increased, the water content is obviously reduced, the oil well liquid production at the initial stage of open flow is 6.1t/d, the oil production is 3.7t/d, the water content is 40%, the daily liquid production after pumping of an oil well machine is 6.6t/d, the daily oil production is 2.1t/d, the water content is 68.1%, the average daily oil increment of a single well is 1.5t/d, the accumulative oil increment is 675t, the validity period reaches 15 months, and the effect is continued.
Example 2
The effective thickness of oil layer of P11 well in certain oil field is 4.8m, average porosity is 24.3%, and average permeability is 27X 10-3μm2The oil layer temperature is 50 ℃, the oil layer pressure is 10.41MPa, the ground crude oil density is 0.9457t/m3, the ground crude oil viscosity is 896.62mPa.s, and the freezing point is 40 ℃.
The injection quantity Q of the nano solution is as follows: v is 3.14R2Hфβ＝3.14×4.82×20×0.243×0.8＝281m3Wherein: r takes 20 and beta takes 0.8. Calculating liquid CO according to gas-liquid ratio 2:12The injection amount was 563 t.
The construction steps are as follows:
(1) a water-based nano-solution of the same example 1 was prepared.
(2) Injecting the water-based nano solution into the stratum through the oil sleeve annulus by using a pump truck, wherein the injection displacement is 40m3And d, injecting in a mode of day injection and night stop to enable the nano solution to fully act with the formation crude oil.
(3) Injection of 5636t liquid CO2The injection displacement is 20 t/d.
(4) Stopping soaking for 18 days.
(5) And (5) well opening and production.
The oil well produced liquid before the operation of a certain oil field P11 well is 2.4t/d, the produced oil is 1.3t/d, and the content is 44.0 percent. Implementation of nanosystem composite CO2After the oil well is dredged, the liquid yield and the oil yield of the P8 well obviously increase, the water content obviously decreases, the oil well liquid yield at the initial blowout stage is 5.4t/d, the oil yield is 4.4t/d, the water content is 19%, the daily liquid yield after oil well pumping is 6.1t/d, the daily oil yield is 2.9t/d, the water content is 52%, the average daily oil increase of a single well is 1.2t/d, the accumulated oil increase is 432t, the effective period reaches 12 months, and the oil well is continuously effective.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. Nano-system composite CO2The method for improving the oil well productivity through huff and puff is characterized by comprising the following steps:
(1) injecting a nano solution slug: preparing water-based nano solution with solid content of 0.005-0.01%, and injecting the water-based nano solution into a stratum in the air by an oil well oil collar;
(2) injection of liquid CO2Slug: mixing liquid CO2The slug is injected into the stratum by the oil well oil sleeve annulus, and liquid CO is injected2The mass ratio of the (ground liquid state) to the water-based nano solution is 1.5: 1-2.2: 1;
(3) stopping injecting and soaking the well: to be liquefied CO2After the injection is finished, closing the well and carrying out well stewing for 10-20 days;
(4) and (3) well opening production: and after the well soaking is finished, the oil well is opened for production. In the open flow process of the oil well, the oil well is adjusted to be an oleophobic near-wellbore zone, so that the deposition of heavy components such as asphaltene in crude oil can be effectively delayed, the fluidity of the crude oil is improved, and the CO is improved2The effect of throughput.
2. The method of claim 1, wherein the water-based nano solution consists essentially of nano SiO2Particles, modifier, dispersant and water, wherein the nano SiO2The particles are nano-SiO prepared by a gas phase method2The particles, the modifier is fluorine-containing siloxane, the dispersant is fluorocarbon surfactant, and water-based nano solution with nano particle content of 0.005-0.01% is prepared.
3. The method according to claim 2, wherein the water-based nano solution consists of the following components in percentage by mass: nano SiO20.005-0.010% of granules1 to 5 percent of fluorine-containing siloxane, 0.1 to 0.5 percent of fluorocarbon surfactant and the balance of water.
4. The method as claimed in claim 2 or 3, wherein the water-based nano solution has nano particles with a size less than 20 nm.
5. The method according to claim 1, wherein the injection quantity Q of the water-based nano solution in the step (1) is: q ═ pi R2HФβ；
In the formula: q-amount of injection of Nano solution, m3(ii) a R is the processing radius, m, the value range is 10-20 m; h, effective thickness of an oil well production layer, m; phi-average pore size of oil well producing zone,%; the beta-direction correction coefficient is dimensionless and has a value range of 0.8-1.0.
6. The method as claimed in claim 1, wherein the water-based nano solution is injected in an amount of 40-60 m3And d, adopting an injection mode of day injection and night stop until the nano solution spreads.
7. The method of claim 1, wherein the CO injected in step (2)2The mass ratio of the water-based nano solution to the mass of the water-based nano solution is 2:1, and the injection speed is 20-30 t/d. During injection, dynamic adjustment can be performed according to the actual injection pressure. If the pressure is lower, the injection amount can be increased, and the injection period can be shortened; if special conditions such as no injection or over-high injection pressure occur, the injection is stopped in time.
8. The method according to claim 3, wherein the water-based nano solution comprises the following components in percentage by mass: nano SiO20.005% of particles, 3% of fluorine-containing siloxane, 0.3% of fluorocarbon surfactant and the balance of water.
9. The method of claim 3, wherein the SiO nanoparticles are2The particles are of nanometer scale prepared by gas phase methodSiO2Particles of SiO2The content is not less than 99.8%; the fluorine-containing siloxane is one of perfluorosiloxane with a terminal methoxy group and a carbon chain length of 4-6; the chain length of the carbon chain of the fluorocarbon surfactant is 6-10, the groups on the molecule of the fluorocarbon surfactant comprise 1-3 methoxyl groups or ethoxyl groups, the fluorocarbon surfactant is one or more of a cationic surfactant and an anionic surfactant, for example, the cationic fluorocarbon surfactant is one or more of Capstone ST110 and Capstone ST300 of the Coroman corporation, and the anionic fluorocarbon surfactant is one or more of Capstone FS-10, FS22, FS31, FS3100, FS50 and FS51 of the Coroman corporation.
10. The method of claim 1, wherein the water-based nano solution is prepared by the steps of:
(1) respectively dropwise adding the fluorocarbon surfactant and the fluorine-containing siloxane into water, and mechanically stirring for 1h under the conditions of water bath at 50 ℃ and 300-2600 r/min.
(2) Mixing nano SiO2Dispersing the particles into the dispersion liquid by an ultrasonic dispersion method, and oscillating for 10 minutes under the action of ultrasonic waves to obtain the water-based nano solution.
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