CN109251740A - A kind of transfer drive system and flooding method suitable for carbonated weathering crust hiding - Google Patents
A kind of transfer drive system and flooding method suitable for carbonated weathering crust hiding Download PDFInfo
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- CN109251740A CN109251740A CN201811150954.5A CN201811150954A CN109251740A CN 109251740 A CN109251740 A CN 109251740A CN 201811150954 A CN201811150954 A CN 201811150954A CN 109251740 A CN109251740 A CN 109251740A
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Abstract
The invention discloses a kind of transfer drive systems suitable for carbonated weathering crust hiding, and the component including following mass fraction: the nano silica of 0.5-2%, the quaternary ammonium salt cationic surfactant of 0.01%-3.0%, surplus are water.The invention also discloses preparation methods, including at room temperature, and nano silica is first added in water, and ultrasound is to evenly dispersed in water after stirring；Add quaternary ammonium salt cationic surfactant, stirring dissolve surfactant sufficiently to get.Transfer drive system of the invention is using quaternary surfactant and the silica nano material being easy to get, with certain increasing injection effect, there are good stability and stratum injection, with good interface stability ability and emulsifiability, both the effect of the displacement of reservoir oil can have been played, stratum profile control can also be carried out.
Description
Technical field
The present invention relates to technical field of petroleum extraction, it is especially a kind of suitable for carbonated weathering crust hiding transfer drive system and
Flooding method.
Background technique
Currently, carbonated weathering crust oil reservoir extensive development is in marine facies oil-gas bearing basin all over the world.(2009) according to statistics,
Global 202 Carbonate Oil gas fields, weathering crust type account for 22%.China also possesses the good large-scale weathering crust oil gas field of a batch,
Such as Bohai gulf basin Renqiu oil field, Tahe Oilfield of The Tarim Basin and take turns southern oil gas field, Ordos Basin pacifies the border region (long celebrating)
Gas field etc..The characteristics of carbonated weathering crust oil reservoir is that the extensive development of weathering crust provides important hydrocarbon migration channel and preserves
Space.But due to the difference of weathering crust development degree, the permeability contrast of reservoir is larger, permeability is from less than 0.01 × 10-3μ
m2To 5 × 10-3μm2It is distributed, since physical difference is larger, causes reservoir that there is very strong heterogeneity.Therefore, using normal
The oil displacement efficiency for advising flooding method is very low.
Chemical flooding is one of the main method that China's waterflooding oil field improves recovery ratio.Wherein, nano material displacement of reservoir oil body
It is to be concerned because it has the characteristics that increasing injection effect and suitable for low-permeability oil deposit.But due to common pure nanometer
Material system dispersibility and stability under the conditions of oil reservoir is compared with high salinity and temperature is poor, especially in heterogeneous reservoir such as crack
In, it can not be formed on interface and stablize absorption；Although and surfactant have higher interfacial activity be easily formed emulsion system,
But the two-phase interface stability formed is poor, it is easily rupturable and it is poly- simultaneously.
Summary of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide it is a kind of suitable for carbonated weathering crust hiding
Transfer drive system and flooding method, the transfer drive system stability is strong, and boundary strength with higher can play in heterosphere
The effect of the displacement of reservoir oil, the flooding method inject reservoir formation by way of segmentation plug injection, can improve system to greatest extent
The displacement of reservoir oil and profile control effect.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of transfer drive system suitable for carbonated weathering crust hiding, the component including following mass fraction: the nanometer two of 0.5-2%
Silica, the quaternary ammonium salt cationic surfactant of 0.01%-3.0%, surplus are water.
Preferably, the transfer drive system suitable for carbonated weathering crust hiding, the component including following mass fraction: 2%
Nano silica, the quaternary ammonium salt cationic surfactant of 0.03%-1%, surplus is water.
Preferably, the transfer drive system suitable for carbonated weathering crust hiding, the component including following mass fraction: 2%
Nano silica, 0.05% quaternary ammonium salt cationic surfactant, surplus is water.
Preferably, the quaternary ammonium salt cationic surfactant has structure shown in formula 1:
Formula 1
In formula 1, the R at both ends is the carbochain of equal length, and the carbochain is C10H21、C12H25Or C14H29Linear carbon chain, n 1
Or 2.
Preferably, the nano silica is hydrophily self-dispersing nano silica.
Preferably, the average grain diameter of the nano silica is 12-18nm.
Preferably, the water is clear water or treated oil field recharged waste water, total salinity < 50000 of the water
Mg/L, pH > 5, ρOil< 50 mg/L, ρSuspended matter<50 mg/L。
The invention also discloses a kind of preparation methods of transfer drive system suitable for carbonated weathering crust hiding, including walk as follows
It is rapid:
At room temperature, nano silica is first added in water, ultrasound is evenly dispersed in water to nano silica after stirring；Again
Quaternary ammonium salt cationic surfactant is added, stirring dissolves the surfactant sufficiently, obtains being suitable for carbonated weathering crust hiding
Transfer drive system.
Preferably, the time of the stirring is 3-5 minutes, and the time of the ultrasound is 60-70min.
The invention also discloses a kind of flooding methods suitable for carbonated weathering crust hiding, are suitable for carbonic acid using described
The transfer drive system of salt weathering shell hiding carries out the displacement of reservoir oil, comprising the following steps:
(1) preposition pretreatment slug is injected into stratum, volume injection rate is the 0.1% ~ 1.0% of formation pore volume；
(2) principal piece plug is injected into stratum, volume injection rate is the 30%~50% of stratum total pore size volume；
(3) postposition is injected into stratum and protects slug, and volume injection rate is the 0.1% ~ 1.0% of stratum total pore size volume；
(4) closing well 5~10 days；
(5) it drives a well and resumes production.
The preposition pretreatment slug is the aqueous solution of the quaternary ammonium salt cationic surfactant, quaternary table in aqueous solution
The mass fraction of face activating agent is 0.1%~0.4%；
The principal piece plug is the transfer drive system suitable for carbonated weathering crust hiding；
The postposition protection slug is the aqueous solution of the nano silica, the mass fraction of nano silica in aqueous solution
For 2 %.
Surfactant can play the role of reducing capillary pressure, increase capillary number, and nano material is with extremely strong
Migration and adsorption capacity can play the role of improving displacement efficiency and swept volume with stable emulsion, the two cooperation.Tradition
Cationic surfactant precipitating is generated due to the charge adsorption of surface of stratum in the displacement of reservoir oil, dosage is excessive, not only increases
Cost also will cause environmental pollution.And there are two hydrophilic radicals for the cationic surfactant tool that the present invention uses, hydrophily is more
By force, after nano silica is compounded with quaternary ammonium salt cationic surfactant, surfactant is due to the phase interaction between hydrophobic chain
With being existed in water using U-shaped conformation, nano silica is negatively charged in water, quaternary surfactant band in water
Positive charge, due to charge effect, nano silica is present in the U-shaped conformation of quaternary surfactant close to two polar groups
In the aqueous phase interface of group, since distance is big between nanometer silicon dioxide particle, graviational interaction is small between particle, is not susceptible to assemble,
Stably dispersing performance greatly improves, simultaneously because the presence of the steric hindrance and nano silica of polar group, on the one hand makes
Obtaining the micellar charge density that surfactant is formed reduces, on the other hand since the volume of of polar group itself is larger, in addition
The presence of nano silica reduces the use of surfactant so that single micella increases in the adsorption area of solution surface
Amount reduces and gathers simultaneously.After surfactant encounters oil in the earth formation, lotion, the cream of formation are spontaneously formed with water and crude oil immediately
Liquid can disperse again nano silica, and silica is detached from quaternary surfactant immediately at this time, is adsorbed on solid-liquid
On liquid-liquid interface, the adhesion strength of crude oil and rock surface is reduced, reduces absorption boundary layer, under the souring of water, crude oil
It is easier to be stripped rock surface.Crude oil, surfactant and nano silica play synergistic effect, promote the displacement of crude oil
It carries out.Meanwhile part nano silica, due to charge attraction, Electrostatic Absorption effect occurs for Surfactant again, in cream
Tightly packed, to obtain good emulsion stability is formed on liquid oil-water interfaces, boundary strength is high, can play certain profile control and make
With.
The beneficial effects of the present invention are:
(1) compared with traditional polymer flooding and ternary composite driving, present invention has the advantage that nanometer titanium dioxide silicon systems industry
Change product, cheap and easily-available, synthesis of surfactant and step is simple when compounding with nano material, technique understands, when without consuming
Between further process；The transfer drive system can play the role of the displacement of reservoir oil in homosphere, and have certain increasing injection
Effect, with good stability and stratum injection have good interface stability ability and emulsifiability, can both play
The effect of the displacement of reservoir oil can also carry out stratum profile control.
(2) nano silica that the present invention uses cooperates with effect with good with quaternary ammonium salt cationic surfactant
It answers, individual nano silica system plays milkiness can be poor, and the steady milkiness of pure surfactant system can be poor, when in nano-silica
When SiClx is compounded with quaternary ammonium salt cationic surfactant, nano silica is participated in the conformation of surfactant, is increased
Surfactant forms the adsorption area of micella and reduces charge density, reduces the dosage of surfactant, plays and reduce surface
The poly- effect simultaneously of activating agent, with environment existing for crude oil, nano silica participates in the process of mother oil displacement, when lotion shape
It is participated in the constructing of emulsion interface again at, nano silica, plays the work for forming lotion in effectively good ground
With.
(3) the nano silica compound displacement system that the present invention uses, nano silica partial size is small, can be suitable for
The heterogeneous reservoir of multiple types, is particularly suitable for low-permeability oil deposit, and the nano silica of use has good heatproof, resistance to
Salt, endurance of cutting energy can be avoided binary combination flooding or the lost bring adverse effect of ternary composite driving medium viscosity.
(4) the nano silica compound displacement system that the present invention uses has good ageing stability, old at 75 DEG C
Change after two months, compound displacement system still keeps stable volume and partial size, illustrates that prolonged high temperature can not destroy nanometer
The composite construction and its stablizing on interface of silica and surfactant adsorb.
(5) it is strong to be still able to maintain preferable structure after reservoir temperature aging for the nanometer titanium dioxide silicon emulsion that the present invention uses
Degree can generate high seepage channel and effectively block, and make to be subsequently implanted into the higher level of pressure holding, have preferable mobility control
Ability processed can significantly improve the swept volume of subsequent fluid.
(6) alkali is not added by the present invention, can avoid alkali bring adverse effect.
(7) this flooding method is simple, by the way that three displacement of reservoir oil slugs are arranged, can improve compound displacement system to greatest extent
Oil displacement efficiency.
Detailed description of the invention
Fig. 1 is the experiment photo after the transfer drive system emulsification in the embodiment of the present invention one.
Fig. 2 is R C in the embodiment of the present invention two12H25Linear carbon chain, n be 1 surfactant and nanometer titanium dioxide
Silicon compound system, surface tension with concentration trend chart.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
A kind of transfer drive system suitable for carbonated weathering crust hiding, the component including following mass fraction: 0.5-2%'s receives
Rice silica, the quaternary ammonium salt cationic surfactant of 0.01%-3.0%, surplus is water.
The quaternary ammonium salt cationic surfactant has structure shown in formula 1:
Formula 1
The R at both ends is the carbochain of equal length in formula 1, and the carbochain is C10H21、C12H25Or C14H29Linear carbon chain, n be 1 or
2.The nano silica is hydrophily self-dispersing nano silica.The average grain diameter of the nano silica is 12-
18nm.The water be clear water or treated oil field recharged waste water, total salinity<50000 mg/L of the water, pH>5,
ρOil< 50 mg/L, ρSuspended matter<50 mg/L。
A kind of preparation method of the transfer drive system suitable for carbonated weathering crust hiding, includes the following steps:
(20 ± 5 DEG C) at room temperature, are first added nano silica in water, and ultrasound 60-70min after stirring 3-5 minutes makes nanometer
Silica is evenly dispersed in water；Quaternary ammonium salt cationic surfactant is added, stirring fills the surfactant in 3-5 minutes
Divide dissolution, obtains the transfer drive system for being suitable for carbonated weathering crust hiding.
A kind of flooding method suitable for carbonated weathering crust hiding, when the corresponding well water of water injection well significantly rises, water
When driving inefficient or cause development effectiveness to be deteriorated in vain, and remaining a large amount of remaining oils in stratum, carbonate is suitable for using described
The transfer drive system of weathering crust hiding carries out the displacement of reservoir oil, comprising the following steps:
(1) preposition pretreatment slug is injected into stratum, volume injection rate is the 0.1% ~ 1.0% of formation pore volume；
(2) principal piece plug is injected into stratum, volume injection rate is the 30%~50% of stratum total pore size volume；
(3) postposition is injected into stratum and protects slug, and volume injection rate is the 0.1% ~ 1.0% of stratum total pore size volume；
(4) closing well 5~10 days；
(5) it drives a well and resumes production.
The preposition pretreatment slug is the aqueous solution of the quaternary ammonium salt cationic surfactant, quaternary table in aqueous solution
The mass fraction of face activating agent is 0.1%~0.4%.By the preposition pretreatment slug of setting, nearly well oil saturation can be reduced,
The relative permeability difference for increasing oil-water-layer, is conducive to the injection of follow-up work liquid.
The principal piece plug is the transfer drive system suitable for carbonated weathering crust hiding；By the way that transfer drive system slug is arranged,
Efficient surfactant in the transfer drive system can significantly improve the washing oil effect of oil displacement agent by reducing oil water interfacial tension
Rate, nano silica generate absorption in rock surface, displace residual oil, meanwhile, rich in nano silica in oil-water interfaces
The lotion of upper closelypacked micro-meter scale can be realized due to can be stable be present in stratum to high seepage channel
It blocks, expands the swept volume of subsequent fluid, by the synergistic effect of three, increase substantially oil recovery factor.
The postposition protection slug is the aqueous solution of the nano silica, the quality of nano silica in aqueous solution
Score is 2 %.Slug is protected by setting postposition, main body slug is can protect and plays one's part to the full, prevent main body slug by close
The larger differential pressure action in well area and break through, and improve injection pressure.
Nano silica so that lotion can be realized the closure to high seepage channel in the earth formation, expands the stabilization of lotion
The swept volume of big subsequent fluid, enhances the fluidity control ability of compound displacement system.
The ability that compound displacement system reduces oil water interfacial tension can be enhanced in the addition of surfactant, and can be improved
Meet system improves the oil displacement efficiency of compound displacement system conducive to remaining oil from rock layer surface removing at newborn and steady newborn ability.
Nano silica used in following embodiment is that particle size is 13nm or so (pH=5~7) hydrophilic dioxy
Silicon carbide particle dispersion liquid is to buy from Aldrich-Sigma company, and specific surface area is 220 m2/ g, density are 1.21 g/mL
(25 DEG C)；Quaternary surfactant used is purchased from Shanghai Aladdin biochemical technology limited liability company.
Embodiment one
The present embodiment evaluates the transfer drive system high-temperature emulsifiability with high salt for being suitable for carbonated weathering crust hiding.
(20 ± 5 DEG C) at room temperature, configuration nano silica mass fraction are 2.0%, and quaternary surfactant is not
Homogenous quantities score, surplus are the compound system solution 10mL of water, and the surfactant has structure shown in formula 1:
Formula 1
R is C in formula 110H21Linear carbon chain, n 1.
The water is treated oil field recharged waste water, and pH value 5.6, total salinity is 20 000 mg/L, ρOil<30
Mg/L, ρSuspended matter<30 mg/L。
The mass fraction of the surfactant is followed successively by 0.03%, 0.06%, 0.1%, 0.25%, 0.5%, 0.75%, 1%.
By above-mentioned solution, 1:1 is mixed and is put into vial by volume with 10mL n-dodecane respectively, passes through high speed homogenization
Device continuously stirs 4min with the speed of 10000r/min.Gained lotion is put into 75 DEG C of constant temperature oven, is observed after standing 72h
The emulsification situation of system.Observe situation such as Fig. 1, it is known that, lotion has apparent phase middle on a large scale, it is seen that has stronger cream
Change ability, middle mutually unchanged after standing, stability is good.
Embodiment two
(20 ± 5 DEG C) at room temperature, configuration nano silica mass fraction are 2.0%, quaternary surfactant mass fraction
Range from 0.02% to 1.0%, surplus are the compound system of water.The interfacial tension of compound system is measured with surfactant qualities point
Several variations and the trend changed.The surfactant has structure shown in formula 1:
Formula 1
R is C in formula 112H25Linear carbon chain, n 2.
The water is treated oil field recharged waste water, and pH value 6.7, total salinity is 45 000 mg/L, ρOil<50
Mg/L, ρSuspended matter<50 mg/L。
As shown in Fig. 2, abscissa surfactant concentration, ordinate is surface tension, is measured using hanging ring method.As it can be seen that
After quaternary surfactant mass fraction is greater than 0.5%, interface tension no longer declines.
The performance of comprehensive emulsifiability and interfacial tension, when nano silica mass fraction is 2.0%, quaternary ammonium salt surface
For activating agent mass fraction range in 0.03%-1%, the profile modification of system is best.
Embodiment three
This example provides the preparation method of the transfer drive system suitable for carbonated weathering crust hiding.
A kind of transfer drive system suitable for carbonated weathering crust hiding, comprising: nano silica mass fraction is 0.5%；Season
Ammonium salt type surfactant qualities score is 3%；Surplus is water, and the sum of each component mass fraction is 100%.The surfactant
With structure shown in formula 1:
Formula 1
R is C in formula 114H29Linear carbon chain, n 1.
The water is clear water, and pH value 7.0, total salinity is 0 mg/L, ρOil=0 mg/L, ρSuspended matter=0 mg/L。
(20 ± 5 DEG C) at room temperature, side stirring sequentially adds 0.5g silica nano material (partial size is in 96.5g water
13 nm), 3g quaternary ammonium salt cationic surfactant, be formulated within uniform stirring 5 minutes suitable for carbonated weathering crust hiding transfer drive body
System, the transfer drive system oil water interfacial tension is up to 2.4 mN/m.
Example IV
This example provides the preparation method of the transfer drive system suitable for carbonated weathering crust hiding.
A kind of transfer drive system suitable for carbonated weathering crust hiding, comprising: nano silica mass fraction is 1.0%；Season
Ammonium salt type surfactant qualities score is 0.01%；Surplus is water, and the sum of each component mass fraction is 100%.The surface is living
Property agent have formula 1 shown in structure:
Formula 1
R is C in formula 110H21Linear carbon chain, n 2.
The water is treated oil field recharged waste water, and pH value 8.3, total salinity is 49 000 mg/L, ρOil<50
Mg/L, ρSuspended matter<50 mg/L。
(20 ± 5 DEG C) at room temperature, side stirring sequentially adds 1.0g silica nano material (partial size is in 98.99g water
13 nm), 0.01g quaternary ammonium salt cationic surfactant, be formulated within uniform stirring 5 minutes suitable for carbonated weathering crust hiding tune
Displacement system, the transfer drive system oil water interfacial tension reach 3mN/m.
Embodiment five
The flooding method for being suitable for the transfer drive system of carbonated weathering crust hiding is present embodiments provided, are as follows: at 75 DEG C, it will permeate
Rate is 1.36 μm2Artificial core (length 8.5cm, diameter 2.5cm, pore volume about 11.35mL) vacuumize saturated water, saturation
Oil after water drive to 96%, carries out the displacement of reservoir oil of compound displacement system according to following three slugs: preposition pretreatment slug, principal piece plug and after
Set protection slug.The step concrete operations of nano silica complex oil displacing are as follows:
(1) preposition pretreatment slug: preposition pretreatment slug is the aqueous solution of quaternary ammonium salt cationic surfactant, quaternary ammonium in aqueous solution
The mass fraction of salt form surfactant is 0.1%, and volume injection rate is the 0.1% of rock pore volume；
(2) principal piece plug: principal piece plug is to contain 2.0% nano silica (partial size 13nm) of mass fraction and mass fraction
The transfer drive system for being suitable for carbonated weathering crust hiding of 0.05% surfactant, volume injection rate are rock pore volume
50%, the surfactant has structure shown in formula 1:
Formula 1
R is C in formula 112H25Linear carbon chain, n 1；
The water is treated oil field recharged waste water, and pH value 8.5, total salinity is 35 000 mg/L, ρOil<50 mg/
L, ρSuspended matter<50 mg/L。
(3) postposition protects slug: it is the aqueous solution of nano silica (partial size 13nm) that postposition, which protects slug, water-soluble
The mass fraction of nano silica is 2.0% in liquid, and volume injection rate is the 1.0% of rock pore volume；
Complete above three step, 75 DEG C of agings 5 days and then secondary water drive reach 98% to aqueous.
According to experiment, after injecting the transfer drive system for being suitable for carbonated weathering crust hiding, subsequent waterflooding staged pressure is obvious
Rise, and can still keep higher pressure after 5 times of pore volumes of water drive, there is stronger fluidity control ability, significantly mention
High recovery rate rises in value up to 12.11%.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of transfer drive system suitable for carbonated weathering crust hiding, which is characterized in that the component including following mass fraction:
The nano silica of 0.5-2%, the quaternary ammonium salt cationic surfactant of 0.01%-3.0%, surplus are water.
2. a kind of transfer drive system suitable for carbonated weathering crust hiding as described in claim 1, which is characterized in that including following
The component of mass fraction: 2% nano silica, the quaternary ammonium salt cationic surfactant of 0.03%-1%, surplus are water.
3. a kind of transfer drive system suitable for carbonated weathering crust hiding as described in claim 1, which is characterized in that including following
The component of mass fraction: 2% nano silica, 0.5% quaternary ammonium salt cationic surfactant, surplus are water.
4. a kind of transfer drive system suitable for carbonated weathering crust hiding as described in claim 1, which is characterized in that the quaternary ammonium
Salt form surfactant has structure shown in formula 1:
Formula 1
In formula 1, the R at both ends is the carbochain of equal length, and the carbochain is C10H21、C12H25Or C14H29Linear carbon chain, n 1
Or 2.
5. a kind of transfer drive system suitable for carbonated weathering crust hiding as described in claim 1, which is characterized in that the nanometer
Silica is hydrophily self-dispersing nano silica.
6. a kind of transfer drive system suitable for carbonated weathering crust hiding as claimed in claim 5, which is characterized in that the nanometer
The average grain diameter of silica is 12-18nm.
7. a kind of transfer drive system suitable for carbonated weathering crust hiding as described in claim 1, which is characterized in that the water is
Clear water or treated oil field recharged waste water, total salinity<50000 mg/L of the water, pH>5, ρOil< 50 mg/L,
ρSuspended matter<50 mg/L。
8. a kind of preparation method of transfer drive system suitable for carbonated weathering crust hiding as described in claim 1, feature exist
In including the following steps:
At room temperature, nano silica is first added in water, ultrasound is evenly dispersed in water to nano silica after stirring；Again
Quaternary ammonium salt cationic surfactant is added, stirring dissolves the surfactant sufficiently, obtains being suitable for carbonated weathering crust hiding
Transfer drive system.
9. a kind of preparation method of transfer drive system suitable for carbonated weathering crust hiding as claimed in claim 8, feature exist
In the time of the stirring is 3-5 minutes, and the time of the ultrasound is 60-70min.
10. if the described in any item transfer drive systems suitable for carbonated weathering crust hiding of claim 1-7 are in carbonated weathering crust
The flooding method of hiding, which comprises the following steps:
(1) preposition pretreatment slug is injected into stratum, volume injection rate is the 0.1% ~ 1.0% of formation pore volume；
(2) principal piece plug is injected into stratum, volume injection rate is the 30%~50% of stratum total pore size volume；
(3) postposition is injected into stratum and protects slug, and volume injection rate is the 0.1% ~ 1.0% of stratum total pore size volume；
(4) closing well 5~10 days；
(5) it drives a well and resumes production；
The preposition pretreatment slug is the aqueous solution of the quaternary ammonium salt cationic surfactant, and quaternary surface is living in aqueous solution
Property agent mass fraction be 0.1%~0.4%；
The principal piece plug is the transfer drive system for being suitable for carbonated weathering crust hiding；
The postposition protection slug is the aqueous solution of the nano silica, the mass fraction of nano silica in aqueous solution
For 2 %.
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| CN112708405A (en) * | 2020-12-30 | 2021-04-27 | 宁波锋成先进能源材料研究院有限公司 | Integrated profile control agent, preparation method and application thereof |
| CN114854387A (en) * | 2022-05-24 | 2022-08-05 | 中国石油大学(北京) | Nano flower-nano sheet dual-inorganic nano profile control and flooding system and application 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 |
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