CN107556994A - A kind of emulsifying combination flooding composition and its application in tertiary oil recovery - Google Patents
A kind of emulsifying combination flooding composition and its application in tertiary oil recovery Download PDFInfo
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Abstract
The present invention provides a kind of emulsifying combination flooding composition and its application in tertiary oil recovery, is counted using the gross weight of the emulsifying combination flooding composition as 100%, it includes：Complexed surfactant 0.05wt% 0.3wt%, polymer 0.1wt% 0.25wt%, the 1.2wt% of sodium carbonate 0, surplus is water；Wherein, counted using the gross weight of the complexed surfactant as 100%, the complexed surfactant is made up of 5wt% 95wt% petroleum sulfonate and 95wt% 5wt% alkyl beet alkali ampholytic surface active agent.Emulsifying combination flooding composition provided by the present invention contains complexed surfactant (petroleum sulfonate compounds with alkyl beet alkali ampholytic surface active agent), with weak base or it is alkali free in the case of, can make oil water interfacial tension reach the ultralow order of magnitude (<1×10‑2MN/m), while the emulsifying combination flooding composition has stronger emulsion stability.
Description
Technical field
The present invention relates to a kind of emulsifying combination flooding composition and its application in tertiary oil recovery, belong to oil exploitation skill
Art field.
Background technology
The main force of CNPC oilfield water flooding, which develops oil fields, at present mostly enters " double height " exploitation of High water cut, high recovery percent of reserves
Stage, the difficulty for further improving recovery ratio increase.Simultaneously with the increasing to oil demand pressure and old filed recovery percent
Further deepen, the importance that tertiary oil recovery improves recovery efficiency technique will display all the more.Chemical combined flooding technology is through scene
Experiment is proved to be one of effective ways for increasing substantially high water cut oil field recovery ratio.After chemical combined flooding technology is the eighties
The new method that can increase substantially recovery ratio that phase grows up, by the effort of more than 20 years, in surfactant oil displacement
Development, formula system research, mechanism of oil displacement research, the development of combination flooding numerical simulation software, field test conceptual design, note adopt work
Skill research, field test dynamic monitoring research etc. achieve major progress, so that the success of chemical combined flooding oil tech
Ground enters field test conceptual phase by desk research.From 1992, China was successively in triumph, big Khanh Hoa Kelamayi
Oil field has carried out multiple alkali, surfactant and polymers (ASP) ternary chemical combined flooding pilot field test and industrialization ore deposit
Field experiment.These field tests adhere to different oily areas, the reservoir condition significant difference of trial zone, but chemical combined flooding mining site separately and tried
Test and seen obvious effect, chemical combined flooding raising recovery ratio is higher, is 15%-25% (OOIP), and this is multiple for chemistry
The popularization and application for closing technology of reservoir sweep present wide prospect.
The species of surfactant oil displacement mainly has：Petroleum sulfonate, heavy alkylbenzene sulfonate, petroleum carboxylate, alkene
Sulfonated hydrocarbon, lignosulfonates, alcohol ether sulfonate, nonionic surfactant, biosurfactant and amphoteric surface live
Property agent etc..First two surfactant, which has been applied to Oil Field, to be tested.Such as Daqing oil field uses domestic heavy alkyl benzene sulphur
Acid salt surfactant has achieved good oil increasing effect, but field test research in highly basic ASP ternary composite driving field tests
In the problem of some are new continuously emerges again, as field test has used with formula system the highly basic of higher concentration, in some examinations
Test area and find that oil well fouling is serious, pump detection period shortens, so as to add the technical difficulty of oil recovery and fringe cost, or even directly
Influence the normal production of oil well；Secondly as alkali concn height has considerable influence to ternary system viscosity, in order to reach the stream of design
Spend control ability, it has to the concentration of polymer in formula system is increased, so as to add the cost of oil displacement agent；It is in addition, multiple
It is big to close drive production fluid dewater treatment difficulty, cost for oil production increase.
Therefore, combination flooding technology is driven onto weak base ASP ternary composite drivings or alkali-free SP by highly basic ASP tri compounds at present
Binary combination flooding changes.It is adapted to the petroleum sulfonate of Weak Base ASP Flood system also to be applied in Daqing oil field, but still
The problems such as properties of product are to the adaptability of profit and raising product emulsifiability be present.Long carbon chain betaine type amphoteric surface-active
Agent also begins to use in surfactant and polymer (SP) alkali-free compound flooding formula.But because dissolubility is poor, price, limit
Its application is made.Desk research and field test show in recent years, and in addition to interfacial tension is reduced, emulsifiability carries to combination flooding
High recovery rate influential effect is very big, and especially weak base ASP ternarys and alkali-free SP binary composite displacement systems, the negative effect of alkali are obtained
Decrease eliminates, but the emulsifiability of system also weakens significantly, especially alkali-free binary combination flooding system, and emulsifiability is poor, drives
Oily effect is poor.Recently research have indicated that enhancing system emulsifiability is favorably improved recovery ratio, appropriate emulsification is matched somebody with somebody to combination flooding
Fang Gaishan oil displacement efficiencies are particularly significant.For this reason, it is necessary to develop the weak base ASP ternarys of emulsifying or alkali-free SP binary combination floodings are matched somebody with somebody
Side, its emulsifiability is moderately improved mainly under the conditions of weak base or alkali-free by the improvement of surfactant formula, so as to
While strong base ternary composite driving side effect is reduced, enhancing weak base ternary, the oil displacement efficiency of alkali-free binary combination flooding, realize big
Amplitude improves the effect of field application of recovery ratio.The combination flooding formula development of efficient fanout free region is also chemical combined flooding in all kinds of oil
Hide the developing direction and research emphasis of popularization and application.
In summary, there is provided a kind of emulsifying combination flooding composition simultaneously is used it for turning into this area urgently in tertiary oil recovery
The technical problem that need to be solved.
The content of the invention
In order to solve the shortcomings that above-mentioned and deficiency, it is an object of the invention to provide a kind of emulsifying combination flooding composition.
The present invention also aims to provide application of the above-mentioned emulsifying combination flooding composition in tertiary oil recovery.
To reach above-mentioned purpose, the present invention provides a kind of emulsifying combination flooding composition, is combined with the emulsifying combination flooding
The gross weight of thing is 100% meter, and it includes：
Complexed surfactant 0.05wt%-0.3wt%,
Polymer 0.1wt%-0.25wt%,
Sodium carbonate 0-1.2wt%,
Surplus is water；
Wherein, counted using the gross weight of the complexed surfactant as 100%, the complexed surfactant is by 5wt%-
95wt% petroleum sulfonate and 95wt%-5wt% alkyl beet alkali ampholytic surface active agent composition.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that with described compound
The gross weight of surfactant be 100% meter, the complexed surfactant by 30wt%-90wt% petroleum sulfonate and
70wt%-10wt% alkyl beet alkali ampholytic surface active agent composition.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the alkyl sweet tea
Dish alkali amphoteric surfactant includes the one or more in the betaine type amphoteric surfac-tant of different alkyl carbon chain lengths
Combination, wherein, alkyl carbon chain lengths C12-C22；More preferably C13-C16.In addition, alkyl used can be straight chained alkyl or
Branched alkyl, as long as the present invention does not make specific requirement to this and ensures that the purpose of the present invention can be realized.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the alkyl sweet tea
Dish alkali amphoteric surfactant includes one or more of combinations in alkyl amido betaine and alkyl hydroxy sulfo lycine.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the oil sulphur
The mean molecule quantity of hydrochlorate is 400-550, more preferably 430-530.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the oil sulphur
Hydrochlorate includes one or more of combinations in mersolates, mahogany acid sylvite and mahogany acid ammonium salt；
It is highly preferred that the petroleum sulfonate is mersolates.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the polymer
Mean molecule quantity be 500-2500 ten thousand.
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the polymer
Including one or more of combinations in polyacrylamide and salt-resistant polymer (conventional substances used in this area).
According to specific embodiment of the present invention, in the emulsifying combination flooding composition, it is preferable that the water is oil
Sewage is injected in field；
It is highly preferred that the salinity of the oil field injection sewage is 3000-30000mg/L.
Present invention also offers application of the above-mentioned emulsifying combination flooding composition in tertiary oil recovery.
According to specific embodiments of the present invention, in the application, it is preferable that the tertiary oil recovery is answered including alkali-free binary
Close and drive oil recovery or Weak Base ASP Flood oil recovery.Wherein, when emulsifying combination flooding composition provided by the present invention contains weak base
During sodium carbonate, it is ternary (alkali/Surfactant/Polymer) combination flooding composition, is recovered the oil available for Weak Base ASP Flood；
When the emulsifying combination flooding composition does not contain weak base sodium carbonate, it is binary (Surfactant/Polymer) combination flooding
Composition, it can be used for alkali-free binary combination flooding oil recovery.Emulsifying combination flooding composition provided by the present invention is used for weak base
Ternary or alkali-free binary combination flooding system, the purpose of enhancing system emulsifiability is reached by complexed surfactant, so as to
Improve the recovery ratio of tertiary oil recovery.
Chemical combined flooding was being developed in the past with surfactant flooding agent, and main consideration makes profit reach ultralow interface
Power, its emulsifiability less focusing on, desk research and field test show in recent years, in addition to interfacial tension is reduced, emulsibility
It is very big that recovery ratio influence can be improved on combination flooding, especially to weak base ASP ternary composite displacement systems and alkali-free SP binary combination flooding bodies
System, enhancing emulsification are favorably improved recovery ratio.It is difficult to realize in routine, single type surfactant and reaches ultralow
Interfacial tension has the purpose of stronger emulsifiability again, and emulsifying combination flooding composition provided by the present invention contains composite table
Face activating agent (petroleum sulfonate is compounded with alkyl beet alkali ampholytic surface active agent), with weak base or alkali free situation
Under, can make oil water interfacial tension reach the ultralow order of magnitude (<1×10-2MN/m), at the same the emulsifying combination flooding composition have compared with
Strong emulsion stability.It is demonstrated experimentally that the system has certain adaptability to profit, the effect of system emulsified crude oil is strengthened, indoor
Core flooding test works well.Meanwhile laboratory core oil displacement experiment shows, under the same conditions, emulsifying provided by the present invention
The recovery ratio of Weak Base ASP Flood formula is than low-tension Weak Base ASP Flood formula (the conventional combination flooding that this area uses
Composition) it is high by 4.7%.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, in conjunction with detail below
Embodiment to technical scheme carry out it is described further below, but it is not intended that to the present invention can practical range limit
It is fixed.
Raw material is selected：
Petroleum sulfonate DPS series, the production of Daqing Refinery company；Petroleum sulfonate KPS series, Karamay, Xinjiang refinery
Company produces；Petroleum sulfonate FPS series, Fushun Petrochemical Company production, wherein, petroleum sulfonate DPS series, petroleum sulfonate
KPS series and petroleum sulfonate FPS series are mersolates.
Cocoamido betaine, alkyl carbon chain lengths C13；Alkyl hydroxy sulfo lycine, alkyl carbon chain lengths C16。
Polyacrylamide HPAM, the production of Daqing Refinery company, mean molecule quantity is 2000-2500 ten thousand.Salt-resistant polymer
KYPAM, Beijing perseverance dimerization plant produced, mean molecule quantity are 2000-2500 ten thousand.
Crude oil sample：North China Oilfield oil recovery factory dewatered oil, oil recovery factory of Karamay Oil Fields in Xinjiang dewatered oil.
Water sample：Sewage, salinity 9837mg/L inject in North China Oilfield oil recovery factory；Note oil recovery factory of Karamay Oil Fields in Xinjiang
Enter sewage, salinity 13293mg/L.
Interfacial tension tester uses TEXAS-500C spinning drop interfacial tensiometers, and interfacial tension test temperature is for oil reservoir
Layer temperature (North China Oilfield is 54 DEG C, and Karamay oilfield is 42 DEG C), the interfacial tension testing time is 2 hours stable equilibrium's values.
Emulsion stability (Ste) refer to that a certain amount of surfactant forms the stability of emulsion after making profit fully emulsified
Size, with the diversion ratio (f of emulsion in certain timev) calculate, the calculation formula of emulsion stability index is：Ste=1-
fv。
Embodiment 1
A series of emulsifying combination flooding compositions are present embodiments provided, wherein, the emulsifying combination flooding composition includes
Ternary composite driving composition and binary combination flooding composition,
The ternary composite driving composition includes complexed surfactant (90wt% petroleum sulfonate DPS and 10wt% coconut palms
Oleamide glycine betaine), polymer (HPAM 1200mg/L), sodium carbonate and North China Oilfield oil recovery factory injection sewage；
The binary combination flooding composition includes complexed surfactant (90wt% petroleum sulfonate DPS and 10wt% coconut palms
Oleamide glycine betaine), polymer (HPAM 0.12wt%) and North China Oilfield oil recovery factory injection sewage；Each component content is shown in Table 2-3
It is shown.
The interfacial tension and system (binary, ternary system) emulsion stability of North China Oilfield profit sample are tested, it is specific to survey
Test result is see shown in table 1-3.
The petroleum sulfonate DPS of table 1 is as influence of the activating agent to North China crude oil/injection sewage interfacial tension (mN/m)
(HPAM 0.12wt%)
Influence (HPAM of the complexed surfactant of table 2 (SM1) to North China crude oil/injection sewage interfacial tension (mN/m)
1200mg/L)
Wherein, complexed surfactant (SM1) described in table 2 is by 90wt% petroleum sulfonate DPS and 10wt% cocounut oil acyls
Amine betaine group into.
The binary of table 3, the emulsion stability test result of ternary system
The as shown by data of table 1, single petroleum sulfonate DPS can make North China oil-water interfaces in alkali-free and weak base combination flooding formula
Tension force reaches ultralow, is not added with the conditions of alkali, can be that 0.1%-0.3% scopes reach ultralow interface in surfactant concentration
Power；Under the conditions of adding alkali, can be 0.2%-1.2% scopes in alkali concn, surfactant concentration be that 0.05%-0.3% scopes reach
To ultralow interfacial tension.
Equally as seen from the data in Table 2, complexed surfactant SM1 also can make North China in alkali-free and weak base combination flooding formula
Oil water interfacial tension reaches ultralow, is not added with the conditions of alkali, can be that 0.1%-0.3% scopes reach ultralow in surfactant concentration
Interfacial tension；Can be 0.2%-1.2% scopes, surfactant concentration 0.05%-0.3% in alkali concn under the conditions of adding alkali
Scope reaches ultralow interfacial tension.
From the compound system emulsifiability measurement result of table 3, single petroleum sulfonate DPS binary, tri compound
It is only 5.15% and 5.38% to drive formula system emulsion stability index determining value, and complexed surfactant SM1 binary, three
First combination flooding formula system emulsion stability index determining value can reach 27.76% and 29.55%.This shows single oil sulphur
Hydrochlorate DPS emulsified crude oil ability is poor, and complexed surfactant SM1 emulsified crude oil performances are improved.
Embodiment 2
A series of emulsifying combination flooding compositions are present embodiments provided, wherein, the emulsifying combination flooding composition is three
First combination flooding composition,
The ternary composite driving composition includes complexed surfactant (80wt% petroleum sulfonate FPS and 20wt% alkane
Base hydroxy sulfo lycine), polymer (KYPAM 0.12wt%), sodium carbonate and North China Oilfield oil recovery factory injection sewage；Each component
Content is shown in Table shown in 5-6.
Test the interfacial tension and system (ternary system) emulsion stability of North China Oilfield profit sample, specific test result
See shown in table 4-6.
The petroleum sulfonate FPS of table 4 is as influence of the activating agent to North China crude oil/injection sewage interfacial tension (mN/m)
(KYPAM 0.12wt%)
Influence (KYPAM of the complexed surfactant of table 5 (SM2) to North China crude oil/injection sewage interfacial tension (mN/m)
0.12wt%)
Wherein, complexed surfactant (SM2) described in table 5 is by 80wt% petroleum sulfonate FPS and 20wt% alkyl hydroxyls
Sulfobetaines forms.
The emulsion stability test result of the ternary system of table 6
From the data of table 4 and table 5, petroleum sulfonate FPS and complexed surfactant SM2 Weak Base ASP Flood
Formula can make North China oil water interfacial tension reach ultralow, can be 0.2%-1.2% scopes, surfactant concentration in alkali concn
Reach ultralow interfacial tension for 0.05%-0.3% scopes.
From the three-component compound system emulsifiability measurement result of table 6, petroleum sulfonate FPS ternary composite drivings match somebody with somebody cube
It is that emulsion stability index determining value is only 6.11%, and complexed surfactant SM2 ternary composite driving formula system emulsifies
Stability indicator can reach 35.56%.This shows that complexed surfactant SM2 emulsified crude oil performances are greatly improved.
Embodiment 3
A series of emulsifying combination flooding compositions are present embodiments provided, wherein, the emulsifying combination flooding composition includes
Ternary composite driving composition and binary combination flooding composition,
The ternary composite driving composition includes complexed surfactant (85wt% petroleum sulfonates KPS-1 and 15wt%
Cocoamido betaine), polymer (KYPAM 0.13wt%), sodium carbonate and the injection of oil recovery factory of Karamay Oil Fields in Xinjiang it is dirty
Water；
The binary combination flooding composition includes complexed surfactant (85wt% petroleum sulfonates KPS-1 and 15wt%
Cocoamido betaine), polymer (KYPAM 0.13wt%) and oil recovery factory of Karamay Oil Fields in Xinjiang injection sewage；Each component
Content is shown in Table shown in 8-9.
Test the interfacial tension and system (binary, ternary system) stable emulsifying of Karamay Oil Fields in Xinjiang's profit sample
Property, specific test result is see shown in table 7-9.
The petroleum sulfonate KPS-1 of table 7 is as activating agent to Kelamayi Crude Oil/injection sewage interfacial tension (mN/m)
Influence (KYPAM 0.13wt%)
Influence of the complexed surfactant of table 8 (SM3) to Kelamayi Crude Oil/injection sewage interfacial tension (mN/m)
(KYPAM 0.13wt%)
Wherein, complexed surfactant (SM3) described in table 8 is by 85wt% petroleum sulfonate KPS-1 and 15wt% cocounut oil
Amide betaine forms.
The binary of table 9, the emulsion stability test result of ternary system
From table 7 and the data of table 8, single petroleum sulfonate KPS-1 and surfactants in combination flooding SM3 can be in alkali-frees
Karamay, Xinjiang oil water interfacial tension is set to reach ultralow with weak base combination flooding formulation condition.
It is multiple from the compound system emulsifiability measurement result of table 9, single petroleum sulfonate KPS-1 binary, ternary
It is only 7.14% and 8.27% to close and drive formula system emulsion stability index determining result, and the two of complexed surfactant SM3
Member, ternary composite driving formula system emulsion stability index determining value can reach 36.13% and 38.99%.This shows single
Petroleum sulfonate KPS-1 emulsified crude oil ability is poor, and complexed surfactant SM3 emulsified crude oil performances are improved.
Embodiment 4
A series of emulsifying combination flooding compositions are present embodiments provided, wherein, the emulsifying combination flooding composition is three
First combination flooding composition,
The ternary composite driving composition includes complexed surfactant (75wt% petroleum sulfonate KPS-2s and 25wt%
Alkyl hydroxy sulfo lycine), polymer (KYPAM 0.13wt%), sodium carbonate and the injection of oil recovery factory of Karamay Oil Fields in Xinjiang it is dirty
Water；Each component content is shown in Table shown in 10-11.
Test the interfacial tension and system (ternary system) emulsion stability of Karamay oilfield profit sample, specific test
As a result see shown in table 10-11.
Influence of the complexed surfactant of table 10 (SM4) to Kelamayi Crude Oil/injection sewage interfacial tension (mN/m)
(KYPAM 0.13wt%)
Wherein, complexed surfactant (SM4) described in table 10 is by 75wt% petroleum sulfonate KPS-2s and 25wt% alkyl
Hydroxy sulfo lycine forms.
The emulsion stability test result of the ternary system of table 11
As seen from the data in Table 10, complexed surfactant SM4 Weak Base ASP Flood, which is matched somebody with somebody, can make Kelamayi profit
Interfacial tension reaches ultralow, can be 0.2%-1.2% scopes in alkali concn, surfactant concentration be 0.05%-0.3% scopes
Reach ultralow interfacial tension.
From the three-component compound system emulsifiability measurement result of table 11, petroleum sulfonate KPS-2 ternary composite driving is matched somebody with somebody
Cube system emulsion stability index determining value is only 9.12%, and complexed surfactant SM4 ternary composite driving formula system
Emulsion stability index can reach 40.89%.This shows that complexed surfactant SM4 emulsified crude oil performances are significantly carried
It is high.
The laboratory core oil displacement experiment of embodiment 5
1) core oil-displacement test method
Core oil-displacement test uses Berea core, and the core diameter is 38mm, length is 200mm or so, air permeability
For 100-200 × 10-3μm2.Oil displacement experiment profit is using North China Oilfield oil recovery factory dewatered oil and injection sewage sample.
Oil displacement experiment step：Rock core saturated oils first uses 0.05mL/min displacement velocity saturated oils, is used after oil breakthrough
The further saturated oils of 0.1mL/min, 0.2mL/min, 0.4mL/min displacement velocity.Then the water drive displacement of reservoir oil is carried out, water drive is to aqueous
When reaching 98%, change note ternary composite driving, composite displacement system injected slurry volume 0.5PV, reinject sequent water flooding and reach to aqueous
More than 98%.Record and water, crude oil amount and pressure change are flowed out in displacement process, calculate oil recovery factor.
2) core oil-displacement test result
The surfactant of low-tension Weak Base ASP Flood system uses the petroleum sulfonate FPS samples in embodiment 2,
Polymer uses salt-resistant polymer KYPAM；The surfactant of emulsifying Weak Base ASP Flood system is used in embodiment 2
Complexed surfactant SM2 samples, polymer use salt-resistant polymer KYPAM.Oil displacement experiment result is shown in Table 12.
The core flooding test efficiency rating experimental result of table 12
As can be seen from Table 12, the rock core waterflood recovery efficiency factor of low-tension Weak Base ASP Flood is only 36.65%, injection
The overall recovery factor for turning water drive after low-tension ternary composite driving is 60.54%, and note low-tension Weak Base ASP Flood improves recovery ratio
For 23.89%.And the rock core waterflood recovery efficiency factor of emulsifying Weak Base ASP Flood is 36.73%, emulsifying weak base ternary is injected
It is 65.32% to turn water overall recovery factor after combination flooding, and it is 28.59% that note emulsifying Weak Base ASP Flood, which improves recovery ratio, experiment
It was observed that there is stronger emulsion in Produced Liquid.Contrast shows that the emulsifiability of enhancing combination flooding formula can be improved further
The oil displacement efficiency of formula, under the same conditions, the recovery ratio of emulsifying ternary composite driving formula is than low-tension ternary composite driving
What is be formulated is high by 4.7%.
Claims (10)
1. a kind of emulsifying combination flooding composition, counted using the gross weight of the emulsifying combination flooding composition as 100%, it includes：
Complexed surfactant 0.05wt%-0.3wt%,
Polymer 0.1wt%-0.25wt%,
Sodium carbonate 0-1.2wt%,
Surplus is water；
Wherein, counted using the gross weight of the complexed surfactant as 100%, the complexed surfactant is by 5wt%-95wt%
Petroleum sulfonate and 95wt%-5wt% alkyl beet alkali ampholytic surface active agent composition.
2. emulsifying combination flooding composition according to claim 1, it is characterised in that with the complexed surfactant
Gross weight is 100% meter, the complexed surfactant by 30wt%-90wt% petroleum sulfonate and 70wt%-10wt%
Alkyl beet alkali ampholytic surface active agent forms.
3. emulsifying combination flooding composition according to claim 1 or 2, it is characterised in that the alkyl beet alkali ampholytic
Surfactant includes one or more of combinations in the betaine type amphoteric surfac-tant of different alkyl carbon chain lengths, its
In, alkyl carbon chain lengths C12-C22；Preferably C13-C16。
4. emulsifying combination flooding composition according to claim 3, it is characterised in that the alkyl beet alkali ampholytic surface
Activating agent includes one or more of combinations in alkyl amido betaine and alkyl hydroxy sulfo lycine.
5. emulsifying combination flooding composition according to claim 1 or 2, it is characterised in that the petroleum sulfonate is put down
Average molecular weight is 400-550, preferably 430-530.
6. emulsifying combination flooding composition according to claim 5, it is characterised in that the petroleum sulfonate includes oil
One or more of combinations in sulfonate sodium, mahogany acid sylvite and mahogany acid ammonium salt；
Preferably, the petroleum sulfonate is mersolates.
7. emulsifying combination flooding composition according to claim 1 or 2, it is characterised in that the average mark of the polymer
Son amount is 500-2500 ten thousand.
8. emulsifying combination flooding composition according to claim 7, it is characterised in that the polymer includes polyacrylamide
One or more of combinations in amine and salt-resistant polymer.
9. emulsifying combination flooding composition according to claim 1 or 2, it is characterised in that the water is that oil field injection is dirty
Water；
Preferably, the salinity of the oil field injection sewage is 3000-30000mg/L.
10. application of the emulsifying combination flooding composition in tertiary oil recovery described in claim any one of 1-9；Preferably, institute
Stating tertiary oil recovery includes alkali-free binary combination flooding oil recovery or Weak Base ASP Flood oil recovery.
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| CN115895633A (en) * | 2021-08-04 | 2023-04-04 | 中国石油天然气股份有限公司 | Oil displacement composition and oil displacement system |
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