CN104594859A - Method for mining tight oil reservoir by nanometer fluid - Google Patents
Method for mining tight oil reservoir by nanometer fluid Download PDFInfo
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- CN104594859A CN104594859A CN201510014844.6A CN201510014844A CN104594859A CN 104594859 A CN104594859 A CN 104594859A CN 201510014844 A CN201510014844 A CN 201510014844A CN 104594859 A CN104594859 A CN 104594859A
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- 239000012530 fluid Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005065 mining Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 239000003945 anionic surfactant Substances 0.000 claims description 21
- 238000000280 densification Methods 0.000 claims description 15
- 239000003208 petroleum Substances 0.000 claims description 12
- 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 10
- 230000035699 permeability Effects 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 10
- 239000002105 nanoparticle Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 6
- 150000007942 carboxylates Chemical class 0.000 claims description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000502 dialysis Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract 2
- 230000005465 channeling Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 77
- 239000011435 rock Substances 0.000 description 17
- 238000006073 displacement reaction Methods 0.000 description 10
- 238000011084 recovery Methods 0.000 description 9
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 238000004088 simulation Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- E21B43/20—Displacing by water
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Edible Oils And Fats (AREA)
Abstract
The invention relates to a method for mining a tight oil reservoir by nanometer fluid. The method comprises the following steps that a nanometer fluid segment plug is injected into the tight oil reservoir, then, water is injected into the oil reservoir through an injecting well, and the exploitation is carried out, and the water injecting speed needs to be smaller than 1.4m/d. According to the method provided by the invention, the nanometer fluid segment plug can invert the oil-wet tight oil reservoir into the water-wet reservoir, and the subsequently injected water can enter a substrate in a dialysis way under the effect of capillary force, so that rest oil in the substrate is used. The sudden water flooding due to fast fluid channeling of the injected water along the cracks can be avoided through low-speed water injection, and the stratum energy after the once oil production of the tight oil reservoir can be supplemented through the water injection.
Description
Technical field
The invention belongs to fine and close oil reservoir production technique field, relate to the method for the fine and close oil reservoir of a kind of nano-fluid exploitation.
Background technology
Along with the development that deepens continuously of oil-gas exploration and development, tight gas, shale gas, coal bed gas, fine and close wet goods unconventionaloil pool illustrate huge potentiality under existing economic technology condition, and Global Oil and Gas Resources will welcome secondary expansion.Fine and close oil refers to adsorb or free state is composed and is stored in oil source rock or with the reservoir rock such as tight sand, dense carbonate of oil source rock alternating layers, next-door neighbour, without the oil accumulation of extensive long-distance migration.The fine and close oily reservoir of China has the features such as low hole, hypotonic, low pressure, and effective exploitation faces lot of challenges.The fine and close oily reservoir exploitation initial stage general oil production of China is relatively high, but by the impact that reservoir properties is poor, strata pressure is low and single well controlled reserves is few, production decline is very fast, lapse rate reaches 40% ~ 90%, even if adopt horizontal well massive hydraulic fracture, fine and close oily reservoir primary recovery efficiency is also only 5% ~ 10%, and after massive hydraulic fracture transformation formation Fracture Systems, sequent water flooding exploitation is injected water and is easily advanced by leaps and bounds fast along crack, cause sudden water flooding, intramatrical crude oil cannot effectively be employed, and water flooding effectiveness is poor.Therefore the method inquiring into fine and close oily reservoir During Natural Depletion later stage energy supplement mode and use rate is significant.
At present, fine and close oily reservoir mainly adopts exhaustion formula to develop and waterflooding extraction.The general oil production of exhaustion formula initial stage of development is relatively high, but by the impact that reservoir properties is poor, strata pressure is low and single well controlled reserves is few, natural energy is very limited, the general rapid decrement of output, the well average individual well tested production value 5.8t/d that long 7 sections of conventional pressure breaks obtain commercial oil, and production yield only 0.6 ~ 0.9t/d.Even if adopt horizontal well massive hydraulic fracture, fine and close oily reservoir primary recovery efficiency is also only 5% ~ 10%.And after fine and close oily massive hydraulic fracture transformation formation Fracture Systems, waterflooding development injects water and easily advances by leaps and bounds fast along crack, cause sudden water flooding, intramatrical crude oil cannot effectively be employed, water flooding effectiveness is poor, long 7 sections of fine and close oil adopt the combination well pattern exploitation of straight well water filling, horizontal well production, and horizontal well is shown in that injecting water has a big risk, and water breakthrough ratio reaches 65%.
Summary of the invention
For the deficiencies in the prior art, the invention provides the method for the fine and close oil reservoir of a kind of nano-fluid exploitation.
Technical scheme of the present invention is as follows:
A method for the fine and close oil reservoir of nano-fluid exploitation, step is as follows:
(1) in densification oil reservoir, nano-fluid slug is injected;
Described densification oil oil reservoir degree of porosity is 7%-10%, and permeability is 0.05mD-0.1mD, and reservoir pore throat diameter is greater than 500nm;
In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.05%-0.1%, and anion surfactant mass fraction is 0.1%-0.5%, and surplus is water;
(2) exploit to water filling in densification oil reservoir;
Or alter least-squares water and nano-fluid are exploited in densification oil reservoir.
According to the present invention, preferably, the anion surfactant described in step (1) is petroleum sulfonate or petroleum carboxylate, more preferably, and petroleum sodium sulfonate or oil carboxylic acid sodium.
Described nano-fluid slug the controlling of injecting quantity is 0.03PV-0.05PV, nano-fluid injection rate≤1.4m/d, more preferably 0.8m/d-1.4m/d.
According to the present invention, preferably, in step (2), when exploiting to water filling in densification oil reservoir, the speed≤1.4m/d of water filling, more preferably 0.8m/d-1.4m/d.
When exploiting to alter least-squares water in densification oil reservoir and nano-fluid, the volume ratio >=20:1 of water and nano-fluid more preferably (20-50): 1, water filling and note nano-fluid speed be 0.8m/d-1.4m/d.
Principle of the present invention is as follows:
The present invention, before water flood recovery, first injects nano-fluid slug, and be that fine and close oily reservoir is reversed to water and wets because oil can wet by nano-fluid effectively, follow-up like this injection water dialysis can enter Medium Culture pore throat, employs Medium Culture remaining oil.In order to better play dialyzing, waterflood injection rate is low, is less than 1.4m/d, so also can avoid injecting the water sudden water flooding that quick channelling causes along crack.
The densification oil oil reservoir that the inventive method is suitable for is: reservoir porosity is 7%-10%, and permeability is 0.05mD-0.1mD, and reservoir pore throat diameter is greater than 500nm.When pore throat in reservoirs is too little, the nano particle in nano-fluid cannot enter pore throat inside, thus cannot play the effect that nano-fluid dialysis improves recovery ratio, the viscosity of crude≤10mPa.s in fine and close oil reservoir, oil saturation >=40%.
The present invention if no special instructions, all by this area routine operation.
The present invention has the following advantages:
1, the present invention injects nano-fluid slug and oil can be wet fine and close oily reservoir anyway for water wets reservoir, and the water of follow-up injection dialysis can enter Medium Culture under the effect of capillary force, thus employs Medium Culture remaining oil.
2, following injected water of the present invention can supplement the stratum energy after compact oil reservoir primary oil recovery, improves recovery ratio.
Detailed description of the invention
Below by specific embodiment, the invention will be further described, but be not limited thereto.
Raw materials usedly in embodiment be convenient source, be commercial products.
Embodiment 1
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, inject nano-fluid slug carry out the displacement of reservoir oil, then carry out water drive.
The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD.In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.05%, and anion surfactant mass fraction is 0.1%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.1PV, and the injection rate of nano-fluid and water is 1.0m/d.
Embodiment 2
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, inject nano-fluid slug carry out the displacement of reservoir oil, then carry out water filling and inject nano-fluid replacing the displacement of reservoir oil.
The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD.In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.05%, and anion surfactant mass fraction is 0.1%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.2PV, and the injection rate of nano-fluid and water is 0.8m/d; When water filling and injection nano-fluid replace the displacement of reservoir oil, the volume ratio of water and nano-fluid is 20:1.
Embodiment 3
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, inject nano-fluid slug carry out the displacement of reservoir oil, then carry out water drive.
The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD.In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.05%, and anion surfactant mass fraction is 0.1%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.3PV, and the injection rate of nano-fluid and water is 1.2m/d.
Embodiment 4
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, inject nano-fluid slug carry out the displacement of reservoir oil, then carry out water filling and inject nano-fluid replacing the displacement of reservoir oil.
The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD.In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.1%, and anion surfactant mass fraction is 0.2%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.1PV, and the injection rate of nano-fluid and water is 1.4m/d; When water filling and injection nano-fluid replace the displacement of reservoir oil, the volume ratio of water and nano-fluid is 50:1.
Embodiment 5
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, inject nano-fluid slug carry out the displacement of reservoir oil, then carry out water drive.
The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD.In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.2%, and anion surfactant mass fraction is 0.4%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.1PV, and the injection rate of nano-fluid and water is 1.0m/d.
Comparative example 1
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, carry out water drive, do not inject nano-fluid slug.The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD, and the injection rate of water is 1.0m/d.
Comparative example 2
The fine and close oil rock heart is placed in core holding unit, first injects saturation water, then inject saturated oils, obtain simulating fine and close oily oil reservoir; In the fine and close oil reservoir of simulation, inject anionic surfactant solution carry out the displacement of reservoir oil, then carry out water drive.
The internal diameter of the described fine and close oil rock heart is 2.54cm, and length is 5cm, and permeability is 0.08mD.Described anion surfactant mass fraction is 0.1%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and anionic surfactant solution injection rate is 0.1PV, and the injection rate of anionic surfactant solution and water is 1.0m/d.
Experimental example
The recovery ratio that embodiment 1-5 and comparative example 1-2 obtains is listed in table 1, as shown in Table 1: add nano-fluid and improve more than 9.6% than simple waterflood recovery efficiency factor, drives recovery ratio raising more than 5.4% than the simple anion surfactant that adopts.
Table 1 experiment parameter and result
Claims (10)
1. a method for the fine and close oil reservoir of nano-fluid exploitation, step is as follows:
(1) in densification oil reservoir, nano-fluid slug is injected;
Described densification oil oil reservoir degree of porosity is 7%-10%, and permeability is 0.05mD-0.1mD, and reservoir pore throat diameter is greater than 500nm;
In described nano-fluid, particle diameter is the SiO of 10nm-30nm
2the mass fraction of nano particle is 0.05%-0.1%, and anion surfactant mass fraction is 0.1%-0.5%, and surplus is water;
(2) exploit to water filling in densification oil reservoir;
Or alter least-squares water and nano-fluid are exploited in densification oil reservoir.
2. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 1, it is characterized in that, the anion surfactant described in step (1) is petroleum sulfonate or petroleum carboxylate.
3. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 2, it is characterized in that, the anion surfactant described in step (1) is petroleum sodium sulfonate or oil carboxylic acid sodium.
4. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 1, it is characterized in that, the nano-fluid slug the controlling of injecting quantity described in step (1) is 0.03PV-0.05PV.
5. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 1, is characterized in that, the nano-fluid injection rate≤1.4m/d described in step (1).
6. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 5, it is characterized in that, the nano-fluid injection rate described in step (1) is 0.8m/d-1.4m/d.
7. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 1, is characterized in that, in step (2), when exploiting to water filling in densification oil reservoir, and the speed≤1.4m/d of water filling.
8. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 7, it is characterized in that, in step (2), when exploiting to water filling in densification oil reservoir, the speed of water filling is 0.8m/d-1.4m/d.
9. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 1, is characterized in that, in step (2), when exploiting to alter least-squares water in densification oil reservoir and nano-fluid, and the volume ratio >=20:1 of water and nano-fluid.
10. the method for the fine and close oil reservoir of nano-fluid exploitation according to claim 9, it is characterized in that, in step (2), when exploiting to alter least-squares water in densification oil reservoir and nano-fluid, the volume ratio of water and nano-fluid is (20-50): 1.
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| CN106118624A (en) * | 2016-06-20 | 2016-11-16 | 中国石油大学(华东) | The method of asphaltene deposits injury during a kind of nano-fluid suppression low permeability reservoir carbon dioxide flooding |
| CN106448421A (en) * | 2016-07-05 | 2017-02-22 | 中国石油大学(北京) | Dense oil reservoir exploitation simulation device and method |
| CN106566511A (en) * | 2016-10-24 | 2017-04-19 | 中国石油大学(华东) | Surfactant micelle oil displacement agent |
| CN109111905A (en) * | 2018-07-17 | 2019-01-01 | 中国石油大学(北京) | Biology base nano-fluid and its application in low Permeability reservoir for improving recovery factor |
| CN110029989A (en) * | 2018-01-11 | 2019-07-19 | 中国石油化工股份有限公司 | A kind of unconventional oil and gas recovery percent of reserves calculation method and system |
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| CN106010493A (en) * | 2016-05-25 | 2016-10-12 | 中国石油大学(北京) | Composite oil displacement agent as well as preparation method and application thereof |
| CN106118624A (en) * | 2016-06-20 | 2016-11-16 | 中国石油大学(华东) | The method of asphaltene deposits injury during a kind of nano-fluid suppression low permeability reservoir carbon dioxide flooding |
| CN106118624B (en) * | 2016-06-20 | 2019-02-12 | 中国石油大学(华东) | A kind of method that nano-fluid inhibits asphaltene deposits injury during low permeability reservoir carbon dioxide flooding |
| CN106448421A (en) * | 2016-07-05 | 2017-02-22 | 中国石油大学(北京) | Dense oil reservoir exploitation simulation device and method |
| CN106448421B (en) * | 2016-07-05 | 2019-02-19 | 中国石油大学(北京) | Fine and close oil reservoir exploitation simulator and method |
| CN106566511A (en) * | 2016-10-24 | 2017-04-19 | 中国石油大学(华东) | Surfactant micelle oil displacement agent |
| CN106566511B (en) * | 2016-10-24 | 2019-03-01 | 中国石油大学(华东) | A kind of surfactant micellar oil displacement agent |
| CN111094505A (en) * | 2017-09-13 | 2020-05-01 | 日产化学株式会社 | Liquid medicine for crude oil recovery |
| CN110029989B (en) * | 2018-01-11 | 2021-11-02 | 中国石油化工股份有限公司 | Unconventional oil and gas extraction degree calculation method and system |
| CN110029989A (en) * | 2018-01-11 | 2019-07-19 | 中国石油化工股份有限公司 | A kind of unconventional oil and gas recovery percent of reserves calculation method and system |
| CN109111905A (en) * | 2018-07-17 | 2019-01-01 | 中国石油大学(北京) | Biology base nano-fluid and its application in low Permeability reservoir for improving recovery factor |
| CN111909678A (en) * | 2020-08-25 | 2020-11-10 | 大庆中联信实石油科技开发有限公司 | Efficient nano oil displacement agent and preparation method thereof |
| CN116025318A (en) * | 2021-10-26 | 2023-04-28 | 中国石油天然气股份有限公司 | Low-permeability fractured reservoir depressurization and injection increase nano oil increasing method |
| WO2023116389A1 (en) * | 2021-12-22 | 2023-06-29 | 中国石油天然气集团有限公司 | Microemulsion multifunctional nano oil displacing agent and preparation method therefor and application thereof |
| CN116285926A (en) * | 2022-12-02 | 2023-06-23 | 西安交通大学 | High-calcium and magnesium ion resistant composite nano fluid oil displacement agent and batch preparation method |
| CN117189049A (en) * | 2023-09-28 | 2023-12-08 | 大庆油田有限责任公司 | Nano profile control and flooding method suitable for low-permeability fractured reservoir |
| CN117189049B (en) * | 2023-09-28 | 2024-04-23 | 大庆油田有限责任公司 | Nano profile control and flooding method suitable for low-permeability fractured reservoir |
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