CN106590578A - Composite surfactant composition for medium-mineralization-degree reservoir oil displacement - Google Patents
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Abstract
The invention discloses a composite surfactant composition and its application. The composite surfactant composition aims to solve the problem that a surfactant is poor in oil displacement efficiency in three oil extraction processes of medium-mineralization-degree reservoir oil (10000-50000 mg/L NaCl). The composite surfactant composition includes an anionic surfactant and a cationic surfactant, the molar ratio of the anionic surfactant to the cationic surfactant is 1: (0.01-100), the cationic surfactant is selected from at least one of quaternary ammonium compounds, and the cationic surfactant is shown in the following formula, wherein M1 and M2 are independently selected from either of ammonium ions or alkali metal ions respectively, R and R' are independently selected from any one of H and a C1-C22 fatty group or aryl group respectively. The technical scheme solves the problem well, and the composite surfactant composition can be used in three oil extraction processes of an oil field. The formula is shown in the description.
Description
Technical field
The present invention relates to a kind of be applied to medium salinity oil reservoir oil displacement compound surfactant compositionss.
Background technology
With the increase of world energy sources demand, the rational exploitation and utilization of oil has caused the very big attention of people, oil has been opened
The requirement of the amount of adopting and production efficiency also more and more higher.The high-efficiency mining of petroleum resources is realized, is not only had for crude output is improved
There is realistic meaning, with more important strategic importance.Conventional oil production method (once with secondary method) normally only produces crude oil
The 1/3 of oil in place, the crude oil that there is also about 2/3 fail extraction, therefore in the case where energy day is becoming tight, improve tar productivity
The key subjects of oil exploitation research are become.Tertiary oil recovery technology is then a kind of effective method for improving tar productivity, can be divided
For four big class：One is that heating power drives, including steam drive, combustion in situ etc.；Two is that mixed phase drives, including CO2Mixed phase, hydrocarbon mixed phase
And other noble gases mixed phases drive；Three is chemical flooding；Four is microbe oil production, including biopolymer, antimicrobial surface are lived
Property agent drive.Chemical flooding is technology that is extremely important in intensified oil reduction and implementing on a large scale, including polymer flooding, surfactant
Drive, caustic waterflooding etc. and polymer, alkali, the multiple combination technology of surfactant.The effect of chemical flooding be physical action and
The result of chemical action, physical action refer to the effect that involves of displacing fluid, and chemical action refers to that the microcosmic oil drive of displacing fluid is made
With.The core of chemical action is the interfacial tension for reducing displacing fluid and crude oil.Surfactant is due to having oleophylic (hydrophobic) concurrently
With hydrophilic (oleophobic) property, when surfactant is dissolved in water, molecule is mainly distributed on oil-water interfaces, significantly can be dropped
Low oil water interfacial tension.The reduction of oil water interfacial tension means that surfactant system can overcome the cohesiveness between crude oil,
Larger oil droplet is dispersed into into little oil droplet, so as to improve percent of pass when crude oil flows through pore throat.The oil displacement efficiency of surfactant also table
The wettability of rock surface for making now oleophylic is inverted, emulsification of crude oil, improve the effect such as surface charge density and oil droplet coalescence, this
It is the reason for surfactant plays very important effect in chemical flooding technology.
At present surface active agent for tertiary oil recovery adopts Recompounded multielement system mostly, at the same comprising nonionic surfactant and
Ionic surfactant, is additionally added the auxiliary agents such as alkali and alcohol in part formulation.As patent CN101024764A provides one kind
The surfactant of oil-field thick-oil well, the activating agent be by water, piece alkali, ethanol, Oleic acid, alkylphenol polyoxyethylene,
Dodecylbenzene sodium sulfonate is constituted.For another example patent CN1458219A discloses a kind of surfactant of tertiary oil recovery application and gathers
The pure binary ultralow interfacial tension combination flooding formula of compound, wherein the surfactant for using is petroleum sulfonate or with mahogany acid
Salt adds the complexed surfactant of diluent and other surfactant compounds for host, and the percentage by weight of its component is oil
Sulfonate 50～100%, alkylsulfonate 0～50%, carboxylate 0～50%, alkylaryl sulfonatess 0～35%, low-carbon (LC)
Alcohol 0～20%.And for example patent CN1394935 has invented a kind of chemical oil displacement agent, and which mainly includes sodium octylbenzene sulfonate anion
Surfactant, surfactant adjuvant, surfactant synergist, surface active agent solubilization agent.This oil displacement agent can be bright
The structural viscosity of viscous crude is reduced aobviously, while oil water interfacial tension can be reduced, so as to improve oil recovery factor.
However, above-mentioned surface active agent for tertiary oil recovery still suffers from more problem, mainly surfactant activity is poor, the displacement of reservoir oil
Efficiency is low, simultaneously because surfactant system is excessively complicated, thus Produced Liquid breakdown of emulsion is difficult, and sewage disposal difficulty is big；Separately
It is outer that injury is brought to stratum and oil well as oil displacement system contains inorganic base, the problems such as cause etching apparatus and pipeline, Er Qieyou
The viscosity of polymer can seriously be reduced in inorganic base, the viscosity for needed for reaching has to the concentration for greatly improving polymer,
Improve oil recovery integrated cost；The high temperature resistance of surfactant, high salt tolerance, anti-high salinity it is limited in one's ability.
It is well known that the quilt at present such as anion surfactant, such as petroleum sulfonate, petroleum carboxylate, alkylbenzenesulfonate
During being widely used in tertiary oil recovery, and single cationic surfactant is easily adsorbed or is produced precipitation by stratum because of which,
Therefore the ability of reduction oil water interfacial tension, it is generally not used for tertiary oil recovery.Ratio is waited as cationic and anionic surfactant is close to
Example mixing when its aqueous solution easily form precipitation, so as to cause cationic and anionic surfactant mixed system not only in the application into
For incompatibility, and correlation theory research is also more delayed.Research in recent years finds that cationic and anionic surfactant is mixed
Zoarium system aqueous solution has many anomalous properties, such as due to cationic and anionic surfactant exist in aqueous it is strong quiet
Interaction between electro ultrafiltration and hydrophobic carbon chain, promotes the interionic association of the different charged surfactants of two kinds of bands,
Micelle, the higher surface activity of the single surfactant of producing ratio are readily formed in solution.Additionally, zwitterion surface is lived
Property agent mixed system can obviously reduce cationic surfactant on rock core absorption loss, so as to cation can be significantly reduced
The inherent shortcoming of surfactant.
Gong Yujun etc. (see 2 months the 1st phases Northwest University's journal (natural science edition) of volume 30 in 2000,28～31) research think
Cetyl trimethylammonium bromide (CTAB) has solubilization with sodium lauryl sulphate (SDS) mixed system.
During oil exploitation, can be with " displacement of reservoir oil ", under the oil wash that will be sticked on the sandstone of rock stratum, so as to improve using solubilization
Oil recovery.Huang Hongdu etc. (see petroleum gas journal in August, 2007 the 4th phase of volume 29,101～104) have studied stone
The anion surfactants such as oily sulfonate, petroleum carboxylate, alkylbenzenesulfonate and cetyl trimethylammonium bromide, alkali
The interfacial tension of compound system simultaneously draws to draw a conclusion：The addition of cationic surfactant makes petroleum carboxylate, benzene sulfonamide
Hydrochlorate, the interfacial activity of petroleum sulfonate are improved.
The studies above result shows anions and canons Surfactant Mixing Systems for reduction oil water interfacial tension, the raising displacement of reservoir oil
Efficiency has certain effect.But the former result of study shows that its interface performance still has much room for improvement, the latter in system still
Alkali is employed, the problems such as so as to alkali cannot be avoided to bring injury, etching apparatus and pipeline and breakdown of emulsion difficult to stratum and oil well.
Above-mentioned system is easier to generate precipitation in addition, is unfavorable for practical application.
For this purpose, the present invention absorbs has used for reference forefathers with regard to anions and canons Surfactants mixed system result of study, the opposing party
Contain two sulfonate radical center of negative charge in the dialkyl diphenyl oxide disulfonates analog anion surfactants molecular structure of face, point
Charge of the electron density is higher so that surfactant strengthens to the tolerance level of salinity, cloudy using alkyl diphenyl oxide disulfonates class
Ionic surface active agent replaces traditional anion surfactant, and the interface for significantly improving Surfactant Mixing Systems is lived
Property, it is adaptable to the three of medium salinity oil reservoir (10000～50000mg/L NaCl) adopt technology, have invented for improving crude oil
The anion surfactant and cationic surfactant compound surfactant compositionss of recovery ratio.
The content of the invention
One of the technical problem to be solved is that existing surfactant oil displacement efficiency during tertiary oil recovery is poor, together
When inorganic base is contained due to oil displacement system, the problem for bringing injury, etching apparatus and pipeline and breakdown of emulsion difficult to stratum and oil well,
There is provided a kind of new compound surfactant compositionss, said composition has that interfacial activity is high, washing oil ability is strong, system is simple
It is single, injury will not be brought to stratum and oil well, etching apparatus and pipeline and the advantage of breakdown of emulsion difficulty will not be resulted in.
The two of the technical problem to be solved are to provide a kind of surfactant corresponding with technical problem one is solved
The compound method of compositionss.
The three of problem to be solved by this invention are one of above-mentioned technical problem surface activator compositions in tertiary oil recovery
In application.
To solve one of above-mentioned technical problem, the technical solution used in the present invention is as follows：A kind of compound surfactant combination
Thing, including anion surfactant and cationic surfactant, described anion surfactant and cationic surface
The mol ratio of activating agent is 1:(0.01～100), the one kind of its cationic surfactant in the quaternary ammonium compound, it is cloudy from
Sub- surfactant is represented by following general molecular formula：
Wherein M1、M2Any one in ammonium ion or alkali metal ion is independently chosen from, R, R' are independently chosen from
It is independently selected from H, C1～C22Fat-based or aromatic radical in any one.
In above-mentioned technical proposal, at least one of the cationic surfactant in quaternary ammonium compound, can be ability
The conventional quaternary ammonium compound surfactant in domain, such as quaternary ammonium salt, quaternary ammonium base etc., may be used to the present invention, as preferred institute
State at least one that cationic surfactant preferably is selected from tetraalkyl quaternary ammonium compound, alkyl be saturated alkyl, alkylene,
Any one in aryl；At least one more preferably in tetraalkyl quaternary ammonium salt.
In above-mentioned technical proposal, the total number of carbon atoms in the cationic surfactant molecule preferably 4～60 is further excellent
Elect 4～40 as.
In above-mentioned technical proposal, the tetraalkyl quaternary ammonium salt, the more preferably at least one from molecular structure shown in formula (I)：
Wherein, R1、R2It is independently selected from C1～C22Alkyl, the one kind in substituted hydrocarbon radical, R3、R4It is independently selected from C1～C5
Aliphatic group or substituted fatty hydrocarbon base；Y is selected from makes molecule shown in formula (I) in electroneutral anion, j_For the valence state of Y,
Numbers of the 1/j for Y.
In above-mentioned technical proposal, preferably：R1、R2It is independently selected from C1～C22Alkyl, replace alkyl in one
Kind；R3、R4It is independently selected from C1～C5Alkyl or replace alkyl.
In above-mentioned technical proposal, preferably：Y is selected from halide ion, sulfate ion, nitrate ion, phosphoric acid
At least one in radical ion, polyanion etc., further preferably from halide ion, more preferably chloride ion or bromide ion.
In above-mentioned technical proposal, the substituted hydrocarbon radical, substituted fatty hydrocarbon base, the substituent group replaced in alkyl, can be chemistry
The common substituent group in field, such as hydroxyl, phenyl, halogen etc..
In above-mentioned technical proposal, the anion surfactant cationic M1、M2It is independently chosen from alkali metal ion
Any one, further M1、M2It preferably is selected from any one in identical alkali metal ion.
In above-mentioned technical proposal, described R, R' are independently chosen from H, C1～C22Fat-based or aromatic radical in any one,
Wherein fat-based or aromatic radical can be able to be saturated carbon chains containing heteroatom groups such as acyl group, carbonyl, ether, hydroxyls,
Unsaturated carbon chains can also be contained；Preferably R, R' are independently preferably H, C1～C22Alkyl or replace hydrocarbon
Base；Substituent group can be the common substituent group of chemical field, such as hydroxyl, phenyl, halogen etc., and further R, R' are independent
Preferably H, C1～C22Alkyl, alkylene or aryl, further R, R' be independently preferably H, C8～C22
Alkyl, alkylene or aryl.
In above-mentioned technical proposal, described R, R' are preferably identical.
The preferred model of mol ratio of cationic surfactant described in above-mentioned technical proposal and Anionic-nonionic surfactant
Enclose for 1:(0.01～100).
To solve the two of above-mentioned technical problem, the technical solution used in the present invention is as follows：One of above-mentioned technical problem technology
Described in scheme, the preparation method of compound surfactant compositionss, comprises the following steps：
(1) anion surfactant is dissolved in the water, obtains solution I；
(2) cationic surfactant is dissolved in the water, obtains solution II；
(3) anion surfactant and cationic surfactant are dissolved in water, then according to mol ratio
1:(0.01～100) mix homogeneously, obtains the surface activator composition.
To solve the three of above-mentioned technical problem, technical scheme is as follows：Any one of one of technical problem technical scheme
Application of the compound surfactant compositionss in tertiary oil recovery.
In above-mentioned technical proposal, described application process those skilled in the art can be according to surfactant flooding in prior art
Method is used, and has no particular/special requirement, for example but is not limited to the compound surfactant compositionss with aqueous solution
Form injection reservoir formation in contact with underground crude oil, by underground crude oil displacement out；Wherein, the compound surface is lived
In property agent composition solution, in terms of the total quality of cationic surfactant and anion surfactant, compound surface
Surfactant composition concentration is 0.01～0.5%.
In above-mentioned technical proposal, the compound surfactant compositionss are particularly well-suited to medium salinity oil reservoir oil displacement, i.e.,
Salinity 10000～50000mg/L NaCl oil reservoir oil displacements.The compound surfactant compositionss of the present invention on the one hand due to
Electrostatic attraction effect strong between anions and canons surfactant opposite charges polar group so that surfactant molecule exists
Adsorbed on interfaces amount increases, and critical micelle concentration is significantly reduced, so as to the incomparable high surface of single surfactant
Activity；Simultaneously because the interfacial activity of compound surfactant superelevation, its aqueous solution can form ultralow interfacial tension with crude oil,
So as to effectively overcome the cohesiveness between crude oil, be conducive to former oil-out, and then greatly improve oil displacement efficiency.On the other hand it is multiple
Mould assembly surface activator composition can change oil reservoir wettability of the surface, and the such as cationic surfactant in compositionss passes through
With absorption electronegative Interaction of substituents on a solid surface so as to be desorbed, make glossy wet structure change into neutrality
Moistening or water-wet surface, reduce adhesion work of the crude oil in the surface of solids, so as to be conducive to the stripping of crude oil.While yin, yang
Ionic surface active agent mixed solution has solubilization to crude oil, further can will stick to the crude oil on the sandstone of rock stratum and wash
Under, improve oil recovery factor.
Compound surfactant compositionss of the present invention are adopted during tertiary oil recovery, it is high with interfacial activity：Compound surface
Surfactant composition consumption be 0.01～0.05%wt under the conditions of remain to and underground crude oil formed 10-3～10-4The ultralow boundary of mN/m
Face tension force；Surface activator composition system is simple.As system does not contain inorganic base, thus avoid inorganic when scene is applied
The problem of injury, the corrosion caused to equipment and the breakdown of emulsion difficulty for thus causing that alkali is caused to stratum, achieves preferably
Technique effect.
Below by embodiment, the present invention is further elaborated.
Specific embodiment
【Embodiment 1a】
Double ten alkyl diphenyl ether disulphonic acids sodium and Tetradecyl Trimethyl Ammonium Bromide surfactant are dissolved in water, are stirred
Mix 30 minutes, be configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cation surface activating
Agent mol ratio 1:0.3 mix homogeneously, obtains compound surfactant compositionss 1a.
【Embodiment 2a】
Double octadecyl diphenyl oxide disulfonates and decyl trimethyl ammonium chloride surfactant are dissolved in water, are stirred
Mix 30 minutes, be configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cation surface activating
Agent mol ratio 1:0.25 mix homogeneously, obtains compound surfactant compositionss 2a.
【Embodiment 3a】
Double hexadecyl diphenyl oxide disulfonate is dissolved in water with eight alkyl trimethyl ammonium chloride surfactants, is stirred
Mix 30 minutes, be configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cation surface activating
Agent mol ratio 1:2.2 mix homogeneously, obtain compound surfactant compositionss 3a.
【Embodiment 4a】
Double ten alkyl diphenyl ether disulphonic acids sodium and Dodecyl trimethyl ammonium chloride surfactant are dissolved in water, are stirred
Mix 30 minutes, be configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cation surface activating
Agent mol ratio 1:0.6 mix homogeneously, obtains compound surfactant compositionss 4a.
【Embodiment 5a】
Double disodium 4-dodecyl-2,4 '-oxydibenzenesulfonates are dissolved in water with eicosyl trimethyl ammonia chloride ammonium surfactant,
Stirring 30 minutes, is configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cationic surface is lived
Property agent mol ratio 1:1.05 mix homogeneously, obtain compound surfactant compositionss 5a.
【Embodiment 6a】
Double hexadecyl diphenyl oxide disulfonic acid potassium is dissolved in water with hexadecyltrimethylammonium chloride surfactant,
Stirring 30 minutes, is configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cationic surface is lived
Property agent mol ratio 1:0.2 mix homogeneously, obtains compound surfactant compositionss 6a.
【Embodiment 7a】
Double myristyl diphenyl oxide disulfonates and dodecyl dimethyl benzyl ammonium bromide surfactant are dissolved separately in
In water, stir 30 minutes, be configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cation
Surfactant molar ratio 1:1.2 mix homogeneously, obtain compound surfactant compositionss 7a.
【Embodiment 8a】
Double myristyl diphenyl oxide disulfonates and Cetyltrimethylammonium bromide surfactant are dissolved in water,
Stirring 30 minutes, is configured to 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cationic surface is lived
Property agent mol ratio 1:1.5 mix homogeneously, obtain compound surfactant compositionss 7a.
【Embodiment 9a】Compound surfactant compositionss interface performance is tested
Compound surfactant compositionss are determined with domestic certain oil field oil water interface with TX-500C rotating interfacial tensimeters
Tension force.Temperature of the measurement is 30～90 DEG C, and water salinity is 10000～50000mg/L NaCl, and oil density is 0.72g/ml,
Viscosity is 9.6mp.s.Compound surfactant compositionss consumption is 0.1%wt.
Table 1a compound surfactant compositionss oil water interfacial tensions
From table 1a, compound surfactant prepared by embodiment 1a～8a has good interface performance,
10000～50000mg/L NaCl salinities can keep good interfacial activity.
Compound surfactant prepared by embodiment 3a is configured to into variable concentrations, at 60 DEG C, 20000mg/L NaCl ore deposits
Tested and the oil field oil water interfacial tension under change degree respectively, the results are shown in Table 2a.
Table 2a variable concentrations surface activator composition 3a oil water interfacial tensions
| Dosage of surfactant (%wt) | 0.01 | 0.02 | 0.05 | 0.1 | 0.2 | 0.3 |
| Interfacial tension (MN/m) | 0.0035 | 0.0027 | 0.0011 | 0.0010 | 0.0015 | 0.0024 |
The above results show that compound surfactant compositionss of the present invention have very high oil-water interfaces for the crude oil
Activity.
【Embodiment 10a】Compound surfactant composition solution rock core displacement test
Displacement test is carried out using natural core, rock core length is 5.52cm, diameter 2.51cm, permeability 7.1mD, hole
Porosity 16.4%, crude oil saturation 58%.Water salinity used be 26000mg/L NaCl, 60 DEG C of experimental temperature.With table
Surfactant composition 2a in face is displacing medium, and concentration is 0.1%wt, and displacement velocity is 0.04mL/min, a water drive
Injection 10PV, recovery ratio is 43%；10PV is injected using 0.1%wt surface activator composition 2a solution drives subsequently, is carried
High recovery rate 17%.Show that compound surfactant compositionss of the present invention can significantly improve crude oil recovery ratio.
【Comparative example 1b】
According to《Acta PhySico-Chimica Sinica》The 12nd phase of volume 22 in December, 2006, p1451-1455, Xiao enters the method such as new will
Ten sodium alkyl sulfonates are dissolved in water with dodecyltriethylammonium bromination ammonium surfactant, are stirred 30 minutes, are prepared
Into 0.1%wt aqueous solutions, then by above-mentioned surfactant according to anion:Cationic surfactant mol ratio 1:1.15 it is mixed
Close uniform, obtain compound surfactant compositionss 1b.
【Comparative example 2b】
Double ten alkyl diphenyl ether disulphonic acids natrium surfactants are dissolved in the water, are stirred 30 minutes, is configured to 0.1%wt
Aqueous solution, obtains surfactant solution 2b.
【Comparative example 3b】
Tetradecyl Trimethyl Ammonium Bromide surfactant is dissolved in the water, is stirred 30 minutes, is configured to 0.1%wt water-soluble
Liquid, obtains surfactant solution 3b.
【Comparative example 4b】Compound surfactant compositionss interface performance is tested
Compound surfactant compositionss are determined with domestic certain oil field oil water interface with TX-500C rotating interfacial tensimeters
Tension force.Temperature of the measurement is 60 DEG C, and water salinity is 20000mg/L NaCl, and oil density is 0.72g/ml, and viscosity is 9.6mp.s.
Compound surfactant compositionss consumption is 0.1%wt.
Table 1b compound surfactant compositionss oil water interfacial tensions
| Sample | Interfacial tension (mN/m) |
| Embodiment 1a | 0.0034 |
| Comparative example 1b | 0.0056 |
| Comparative example 2b | 0.79 |
| Comparative example 3b | 1.43 |
By shown in table 1b, embodiment 1a has the performance for more obviously reducing oil water interfacial tension than comparative example, and is combined
Type surfactant has higher interface efficiency than single surfactant.
【Comparative example 5b】Compound surfactant composition solution rock core displacement test
Displacement test is carried out using natural core, rock core length is 5.59cm, diameter 2.49cm, permeability 7.5mD, hole
Porosity 17.2%, crude oil saturation 57%.Water salinity used be 26000mg/L NaCl, 60 DEG C of experimental temperature.With table
Surfactant composition 1b in face is displacing medium, and concentration is 0.1%wt, and displacement velocity is 0.04mL/min, a water drive
Injection 10PV, recovery ratio is 41%；10PV is injected using 0.1%wt surface activator composition 1b solution drives subsequently, is carried
High recovery rate 1.4%.Show that compound surfactant compositionss 1b improve DeGrain to the crude oil recovery ratio.
Claims (10)
1. a kind of compound surfactant compositionss, including anion surfactant and cationic surfactant, institute
The anion surfactant stated is 1 with the mol ratio of cationic surfactant:(0.01～100), wherein cationic surface are lived
Property at least one of the agent in the quaternary ammonium compound, anion surfactant represented by following general molecular formula：
Wherein M1、M2Any one in ammonium ion or alkali metal ion is independently chosen from, R, R' are independently chosen from independent
Selected from H, C1～C22Fat-based or aromatic radical in any one.
2. compound surfactant compositionss according to claim 1, it is characterised in that the cation surface activating
At least one of the agent in tetraalkyl quaternary ammonium compound.
3. compound surfactant compositionss according to claim 2, it is characterised in that the cation surface activating
At least one of the agent in tetraalkyl quaternary ammonium salt.
4. compound surfactant compositionss according to claim 1, it is characterised in that described R, R' are independently selected
From H, C1～C22Alkyl or substituted hydrocarbon radical.
5. compound surfactant compositionss according to claim 4, it is characterised in that described R, R' are independently selected
From H or C1～C22Alkyl, alkylene, aryl.
6. according to the arbitrary compound surfactant compositionss of Claims 1 to 5, it is characterised in that the cationic surface
The total number of carbon atoms in active agent molecule is 4～60.
7. the preparation method of the arbitrary compound surfactant compositionss of claim 1～6, comprises the following steps：
(1) anion surfactant is dissolved in the water, obtains solution I；
(2) cationic surfactant is dissolved in the water, obtains solution II；
(3) according to anion surfactant and cationic surfactant mol ratio 1:(0.01～100) is by solution I and molten
Liquid II mix homogeneously, obtains the surface activator composition.
8. application of the compound surfactant compositionss in tertiary oil recovery any one of claim 1 to 6.
9. application of the compound surfactant compositionss in tertiary oil recovery according to claim 8, it is characterised in that
The compound surfactant compositionss are injected in reservoir formation in form of an aqueous solutions and are contacted with underground crude oil, and underground is former
Oily displacement is out.
10. application of the compound surfactant compositionss in tertiary oil recovery according to claim 9, it is characterised in that
In the compound surfactant composition solution, with the total matter of cationic surfactant and anion surfactant
Gauge, compound surfactant composition concentration are 0.01～0.5%.
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| CN110684205A (en) * | 2018-07-06 | 2020-01-14 | 上海诺科生物科技有限公司 | Low-viscosity high-solid-content wax emulsion, preparation method thereof and emulsifier |
| CN110684205B (en) * | 2018-07-06 | 2024-03-12 | 上海诺科生物科技有限公司 | Low-viscosity high-solid-content wax emulsion, preparation method thereof and emulsifier |
| CN111088024A (en) * | 2018-10-23 | 2020-05-01 | 中国石油化工股份有限公司 | High-temperature high-salt oil reservoir oil-washing agent, preparation method thereof and carbon dioxide oil displacement method |
| US11174424B2 (en) | 2019-01-02 | 2021-11-16 | Petrochina Company Limited | Core-shell structured anionic nano microemulsion system, and preparation and application thereof |
| US11629283B2 (en) | 2019-01-02 | 2023-04-18 | Petrochina Company Limited | N,N,N′,N′-tetradodecyl-substituted diphenyl ether sulfonate anionic Gemini surfactant and synthesis method thereof |
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