CN109356550A - Extra permeability oilfield selectivity frothy gel water plugging profile control agent - Google Patents
Extra permeability oilfield selectivity frothy gel water plugging profile control agent Download PDFInfo
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- CN109356550A CN109356550A CN201811578360.4A CN201811578360A CN109356550A CN 109356550 A CN109356550 A CN 109356550A CN 201811578360 A CN201811578360 A CN 201811578360A CN 109356550 A CN109356550 A CN 109356550A
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- profile control
- water
- control agent
- selectivity
- water plugging
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 43
- 230000035699 permeability Effects 0.000 title claims abstract description 28
- 239000006260 foam Substances 0.000 claims abstract description 20
- 239000004088 foaming agent Substances 0.000 claims abstract description 8
- 150000003863 ammonium salts Chemical class 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000003381 stabilizer Substances 0.000 claims abstract description 7
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical group [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 9
- 239000001099 ammonium carbonate Substances 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- -1 sodium alkyl sulfate Chemical class 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 6
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 6
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 5
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 4
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 43
- 238000006073 displacement reaction Methods 0.000 abstract description 11
- 239000010779 crude oil Substances 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 18
- 239000007924 injection Substances 0.000 description 18
- 239000003129 oil well Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000002981 blocking agent Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000010954 inorganic particle Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 206010016256 fatigue Diseases 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002332 oil field water Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012360 testing method Methods 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
-
- 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
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Colloid Chemistry (AREA)
Abstract
A kind of extra permeability oilfield selectivity frothy gel water plugging profile control agent of the present invention, component including following mass fraction: 0.5~10.0 part of inorganic silicon salt gel, 0.015~1.50 part of foaming agent, 0.012~1.20 part of glycans foam stabiliser of etherificate, inorganic ammonium salt promote solidifying 0.01~1.0 part of regulator, water, and the above raw material amounts to 100 parts.The present invention is to less permeable layer selective water plugging and profile control, transfer drive, not polluted reservoir, subsequent profile control agent is led to enter water stream channel, play the role of blocking water flow macropore, improve the displacement environment of reservoir, sweep efficiency and oil displacement efficiency are improved, and is finally produced with crude oil, has the characteristics that reservoir damage is small.
Description
Technical field
The invention belongs to oil development technical fields, and in particular to a kind of extra permeability oilfield selectivity frothy gel water blockoff
Profile control agent.
Background technique
As oil field long-term injecting water is developed, oil field enters high water cut rate successively.Reservoir Heterogeneity is further exacerbated by.Oil
Hypertonic channel or macropore are gradually formed in layer, seriously affects reservoir water drive development effectiveness.Water plugging and profile controlling is in high water cut oil field control
It is occupied an important position in water stable yields well stimulation.
Currently, the general water blockoff plugging strength of polymer gel genera plug-up agents is big, validity period is long, although having blocked water breakthrough channel,
But it is easy polluted reservoir and less permeable layer, is filled the water after leading to measure and oil producing operation is impacted, it is serious possibly even to lead to oil
Well is scrapped.Traditional selective water-plugging swelling character constant using polymer water-swellable, chance oil, manufactures polymer gel
Volume expansion grain water plugging profile control agent has in the preferable oil reservoir of homogenieity and compares if granularity and formation porosity tie in
Good using effect, but it is poor in heterogeneity low-permeability oil deposit using effect, especially in the multidirectional microcrack development of hyposmosis
Use Limitation fruit is poor in oil reservoir, as inorganic particle blocking agent, easily results in blockage in injection end, is not easily accessible oil reservoir depth
Portion.
Summary of the invention
The object of the present invention is to provide a kind of extra permeability oilfield selectivity frothy gel water plugging profile control agents, realize to hypotonic
Saturating or even special bottom permeable reservoir strata selective water plugging, profile control and transfer drive, polluted reservoir, does not lead subsequent profile control agent to enter water flow logical
Road plays the role of blocking water flow macropore, solves existing most of water plugging profile control agents in nearly well band and accumulates contaminated oil
Layer, can not enter earth formation deep by low permeability oil reservoir pore throat channel, or can enter but cannot effectively block spy
Low permeability reservoirs deep water outlet macropore etc. is not suitable for the problem of low permeability reservoirs use.
In order to achieve the above object, a kind of extra permeability oilfield selectivity frothy gel water plugging and profile controlling provided by the invention
Agent, the component including following mass fraction:
Inorganic silicon salt gel: 0.5~10.0 part；
Foaming agent: 0.015~1.50 part；
Etherificate glycans foam stabiliser: 0.012~1.20 part；
The solidifying regulator of inorganic ammonium salt rush: 0.01~1.0 part；
Water；
The above raw material amounts to 100 parts.
The inorganic silicon salt gel group becomes sodium metasilicate.
The etherificate glycans foam stabiliser is sodium carboxymethylcellulose.
The inorganic ammonium salt is ammonium carbonate or ammonium hydrogen carbonate.
The foaming agent is sodium alkyl sulfate or sodium alkyl sulfonate.
Compared with existing gel water-plugging profile control agent, the beneficial effects of the present invention are:
1. injecting the present invention in the strong hyposmosis of heterogeneity, extra permeability oilfield water injection well or producing well, make in gas displacement
With lower formation frothy gel, foam stability is good, and filter loss is few.
2. frothy gel water plugging profile control agent system is met, water is stable, meets oil defoaming, and the not stifled oil of water blockoff, selectivity is good, has pair
Oil reservoirs injure small feature.
3. after the frothy gel water plugging profile control agent enters earth formation deep under gas displacement, it is big selectively to preferentially enter water outlet
Duct, large fracture form the closure barrier for continuing some cycles, reduce the filter of other profile control blocking agents of subsequent entrance in the short time
Mistake rate.
4. selective gel foam water plugging profile control agent existing for reservoir water drive channel system is during subsequent waterflooding is dynamic, with
The concentration of wherein effective components such as surfactant gradually decrease, or oil is met during driving, it is foam attenuation, poly- and become
Smaller foam exists, and continuously adjusts distribution of the driving water on section of reservoir with its selectional feature, improves the drive of reservoir
For environment, sweep efficiency and oil displacement efficiency are improved, and is finally produced with crude oil.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention include
But it is not limited to the range of following embodiment expression.
A kind of extra permeability oilfield selectivity frothy gel water plugging profile control agent provided by the invention, including following mass fraction
Component:
Inorganic silicon salt gel: 0.5~10.0 part；
Foaming agent: 0.015~1.50 part；
Etherificate glycans foam stabiliser: 0.012~1.20 part；
The solidifying regulator of inorganic ammonium salt rush: 0.01~1.0 part；
Water；
The above raw material amounts to 100 parts.
The inorganic silicon salt gel is sodium metasilicate.
The etherificate glycans foam stabiliser is sodium carboxymethylcellulose.
The inorganic ammonium salt is ammonium carbonate or ammonium hydrogen carbonate.
The foaming agent is sodium alkyl sulfate or sodium alkyl sulfonate.
The present invention provides a kind of extra permeability oilfield selectivity frothy gel water plugging profile control agents, first in water injection well or oil well
Gel water-plugging profile control agent is first injected, is then injected into gas, gas forms foam during displacement gel foamable composition, by foam
The gel formed under the Jamin effect and certain condition of fluid superposition blocks stratum.The system can preferentially enter high aquifer formation, and
It is stabilized；And entering the higher position of oil saturation, gel foaming agent causes foam for largely oil-water interfaces are transferred to
Rupture, plugging effect die down, therefore do not block up the characteristic of oil with water blockoff.In addition aerated fluid has stronger Portability, can take
Band inorganic particle enters earth formation deep, is effectively blocked to deep large fracture.
Finally inject other water plugging profile control agents.The selectivity of low-pressure permeability layer is coagulated by filling the water or recovering the oil after construction
Glue foam profile control system cracks, to realize the purpose of selective water plugging and profile control.
In actual use, system component other, hole condition, injection water and water flooding water quality situation etc. can be fitted with well
Work as adjusting.
Embodiment 1: a kind of extra permeability oilfield selectivity frothy gel water plugging profile control agent, the group including following mass fraction
Point:
Sodium metasilicate: 6 parts；
Sodium alkyl sulfate: 0.5 part；
Sodium carboxymethylcellulose: 0.6 part；
Ammonium carbonate: 0.5 part；
Water；
The above raw material amounts to 100 parts.
Certain large size extra permeability oilfield oil recovery S factory water injection well A229-43 in the middle part of China, 2 mouthfuls of oil well High water cuts of well group.
A228-42 well in August, 2011 is gone into operation, and C7 is exploited2 2Layer, initial stage of going into operation produce liquid 6.70m daily3, day oil-producing 0.62t, aqueous 87.5%,
Saliferous 45045mg/l, in November, 2011 is aqueous to rise to 100%；A230-44 well in August, 2011 is gone into operation, and C7 is exploited2 2Layer is gone into operation
Initial stage produces liquid 2.30m daily3, day oil-producing 0.41t, aqueous 76.8%, saliferous 19305mg/l, hydrodynamic face 1744m contains in December, 2011
It is waterborne to rise to 100%, hydrodynamic face 782m.
When water injection well A229-43 is handled using the water plugging profile control agent measure of extra permeability oilfield selectivity frothy gel, injection
Above-mentioned frothy gel water plugging profile control agent 60m3, injection discharge capacity is 3.0~5.0m3/ h, injecting the gas ground volume, (room temperature is normal
Pressure) 3300 m3, 3.0 ~ 11.5 Mpa of injection pressure.
The well uses oil pressure 8.4Mpa, casing pressure 8.4Mpa before above-mentioned profile control agent.After above-mentioned profile control agent, the water injection well pressure
Power rises: oil pressure 11.8Mpa, casing pressure 11.5Mpa, and 2 mouthfuls of well water decline 19.9% in corresponding well group is tired out in statistics phase half a year
Count incremental oil production 344.9t.
Embodiment 2: a kind of extra permeability oilfield selectivity frothy gel water plugging profile control agent, the group including following mass fraction
Point:
Sodium metasilicate: 0.5 part；
Sodium alkyl sulfate: 1.5 parts；
Sodium carboxymethylcellulose: 1.20 parts；
Ammonium hydrogen carbonate: 0.01 part；
Water；
The above raw material amounts to 100 parts.
Certain large size extra permeability oilfield oil recovery F factory oil well D200-50 is in October, 2007 fracturing production in the middle part of China
C81 1Layer, initial stage transformation plus sand 35.0m3, sand is than 35%, discharge capacity 2.2m3Pure oil 37.8m is produced in/min, formation testing daily3.The well is gone into operation initial stage
Day oil-producing 6.75t, yield gradually decreases down 3t or so after stable yields 7 months, 2 months 2009 effective response for water flood, on daily output liquid, hydrodynamic face
It rises, aqueous to jump, water type sodium sulphate.
Oil well D200-50 is handled using extra permeability oilfield selectivity frothy gel water plugging profile control agent technical measures, is based on
Oil well mainly based on the displacement of reservoir oil, supplemented by water blockoff, admittedly adjusting above-mentioned frothy gel water plugging profile control agent component, injects above-mentioned frothy gel
Water plugging profile control agent 40.0m3, discharge capacity 3.0-4.0m3/ h injects 2700 m of gas ground volume (normal temperature and pressure)3, injection
13.5 ~ 22.5Mpa of pressure.
The well uses daily fluid production rate 5.45m before above-mentioned profile control agent3, aqueous is 93.5%.After being handled using above-mentioned profile control agent,
The oilwell produced fluid amount rises, aqueous decline: daily fluid production rate 6.31m3, aqueous is 72.0 %., aqueous decline 21.5%, half a year statistics
Add up incremental oil production 181.2t in phase.
Embodiment 3:
A kind of extra permeability oilfield selectivity frothy gel water plugging profile control agent, the component including following mass fraction:
Sodium metasilicate: 10 parts；
Sodium alkyl sulfonate: 0.015 part；
Sodium carboxymethylcellulose: 1.2 parts；
Ammonium carbonate: 1.0 parts；
Water；
The above raw material amounts to 100 parts.
Certain large size extra permeability oilfield oil recovery S factory water injection well H274-31 well in the middle part of China fills the water C82Layer, in 2014
Stake in January in year.Corresponding oil well H273-32 well is aqueous from after corresponding water injection well stake to be risen always, and saliferous is always between 8000-
9000mg/l, it is gradually full to start function figure in 2 months in 2014, and mid-April is aqueous to rise to 100%, and late April hydrodynamic face rises,
753m is risen to by 2000m, starts within August 4th set and returns, casing pressure 2.5MPa.Corresponding oil well averagely produces 23.24 m of liquid daily3, put down
Equal day oil-producing 8.21t.Oil well average aqueous 68.2%
When water injection well H274-31 is handled using extra permeability oilfield selectivity frothy gel water plugging profile control agent technical measures, injection
Above-mentioned frothy gel water plugging profile control agent 70.0m3, discharge capacity 3.0-5.0m3/ h always injects the gas 5000m3, injection pressure 12
~24Mpa。
The well uses oil pressure 10.8Mpa, casing pressure 10.8Mpa before above-mentioned profile control agent.After above-mentioned profile control agent, the water injection well
Pressure rises: oil pressure 14.5Mpa, casing pressure 14.5Mpa, and 7 mouthfuls of well water decline 6.8% in corresponding well group is tired out in statistics phase half a year
Incremental oil production 541t is counted, 3387.02 m of precipitation is added up3。
It with embodiment 1 is most preferred embodiment in above embodiments.
From above embodiments as can be seen that in the strong hyposmosis of heterogeneity, extra permeability oilfield water injection well or oil recovery
Well injects profile control agent of the present invention, forms foam under gas displacement effect, foam stability is good, and filter loss is few.Frothy gel is stifled
Water profile modification system meets water stabilization, meets oil defoaming, and water blockoff is not stifled oily, and selectivity is good, has the characteristics that injure oil reservoirs small.It should
After frothy gel water plugging profile control agent enters earth formation deep under gas displacement, water outlet macropore, large fracture are selectively preferentially entered,
The closure barrier for continuing some cycles is formed in short time, reduces the leak-off rate of other profile control blocking agents of subsequent entrance.
In addition aerated fluid has stronger Portability, can carry inorganic particle and enter earth formation deep, to deep large fracture
Effectively blocked.Selective gel foam water plugging profile control agent existing for reservoir water drive channel system moves process in subsequent waterflooding
In, as the concentration of wherein effective components such as surfactant gradually decreases, or oil is met during driving, it is foam attenuation, poly-
And become smaller foam and exist, distribution of the driving water on section of reservoir is continuously adjusted with its selectional feature, improves storage
The displacement environment of layer improves sweep efficiency and oil displacement efficiency, and finally produces with crude oil, has the characteristics that reservoir damage is small.
The contents of the present invention are not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention
And to any equivalent transformation that technical solution of the present invention is taken, all are covered by the claims of the invention.
Claims (5)
1. a kind of extra permeability oilfield selectivity frothy gel water plugging profile control agent, it is characterised in that:
Component including following mass fraction:
Inorganic silicon salt gel: 0.5~10.0 part；
Foaming agent: 0.015~1.50 part；
Etherificate glycans foam stabiliser: 0.012~1.20 part；
The solidifying regulator of inorganic ammonium salt rush: 0.01~1.0 part；
Water；
The above raw material amounts to 100 parts.
2. extra permeability oilfield selectivity frothy gel water plugging profile control agent according to claim 1, it is characterised in that:
The inorganic silicon salt gel group becomes sodium metasilicate.
3. extra permeability oilfield selectivity frothy gel water plugging profile control agent according to claim 2, it is characterised in that:
The etherificate glycans foam stabiliser is sodium carboxymethylcellulose.
4. extra permeability oilfield selectivity frothy gel water plugging profile control agent according to claim 3, it is characterised in that:
The inorganic ammonium salt is ammonium carbonate or ammonium hydrogen carbonate.
5. extra permeability oilfield selectivity frothy gel water plugging profile control agent according to claim 4, it is characterised in that:
The foaming agent is sodium alkyl sulfate or sodium alkyl sulfonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811578360.4A CN109356550A (en) | 2018-12-24 | 2018-12-24 | Extra permeability oilfield selectivity frothy gel water plugging profile control agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578360.4A CN109356550A (en) | 2018-12-24 | 2018-12-24 | Extra permeability oilfield selectivity frothy gel water plugging profile control agent |
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| CN109356550A true CN109356550A (en) | 2019-02-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111749665A (en) * | 2020-07-15 | 2020-10-09 | 陕西明德石油科技有限公司 | Gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing and using method |
| CN113969156A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Chemical agent combination for crude oil displacement and crude oil displacement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111749665A (en) * | 2020-07-15 | 2020-10-09 | 陕西明德石油科技有限公司 | Gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing and using method |
| CN113969156A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Chemical agent combination for crude oil displacement and crude oil displacement method |
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