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CN107916099A - Alkali-free, which sticks, plays surface activator composition and its preparation method and application - Google Patents

Alkali-free, which sticks, plays surface activator composition and its preparation method and application Download PDF

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Publication number
CN107916099A
CN107916099A CN201610878259.5A CN201610878259A CN107916099A CN 107916099 A CN107916099 A CN 107916099A CN 201610878259 A CN201610878259 A CN 201610878259A CN 107916099 A CN107916099 A CN 107916099A
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alkali
surfactant
surface activator
composition
formula
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CN107916099B (en
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王辉辉
李应成
吴春芳
吴国英
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China Petroleum and Chemical Corp
Sinopec Shanghai Research Institute of Petrochemical Technology
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China Petroleum and Chemical Corp
Sinopec Shanghai Research Institute of Petrochemical Technology
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/584Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/30Viscoelastic surfactants [VES]

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Abstract

The preparation method and applications for playing surfactant are sticked the present invention relates to a kind of alkali-free, mainly solve the problems, such as that existing oil displacement system oil displacement efficiency under the conditions of high temperature LOW PERMEABILITY RESERVOIR is poor.By using including beet alkali surface activator, anion surfactant and water, in the beet alkali surface activator such as following formula shown in (I);In the anion surfactant such as formula at least one of (II);Shown in its structure such as formula (I), R1Selected from C8~C29Alkyl, at least one of alkenyl, the R2And R3It is independently chosen from C1~C5Alkylidene, at least one of hydroxyl substituted alkylene, structure formula (II) X is selected from least one of carboxylate radical, sulfonate radical;The molar ratio of the amphoteric surfactant and anion surfactant is 1:0.01~1:100 technical solution, preferably resolves the technical problem, available for being applied in the tertiary oil recovery in oil field.

Description

Alkali-free, which sticks, plays surface activator composition and its preparation method and application
Technical field
The preparation method and applications for playing surfactant are sticked the present invention relates to the alkali-free in a kind of LOW PERMEABILITY RESERVOIR.
Background technology
In the petroleum-in-place that Sinopec is newly verified, the ratio shared by low-permeability oil deposit reserves is up to 60%~ 70%, low-permeability oil deposit by be produced in a considerably long from now on period increasing the storage main resource basis.In recent years, in, The reduction of high permeability reservoir recoverable reserves, the exploitation of low-permeability oil deposit are increasingly valued by people.Surfactant flooding is demonstrate,proved Bright is a kind of extremely promising method for improving low-permeability oil recovery rate, becomes the hot spot studied both at home and abroad.In, High permeability oil reservoir, ganglion is present in the hole of throat radius very little in low-permeability oil pool, remaining under the same terms The hollow billet resistance of oil droplet is much larger than middle and high permeability oil reservoir, therefore activating these ganglions needs lower oil-water interfaces to open Power.Secondly, LOW PERMEABILITY RESERVOIR filtrational resistance is big, and only under larger displacement pressure, liquid could flow.Furthermore noted to improve Water development effectiveness increases injection pressure, but water injection pressure is high, easily cause microcrack unlatching, and water is advanced by leaps and bounds along crack, causes the displacement of reservoir oil Efficiency reduces, and swept volume is small, and it is serious to cover damage.Research shows that surfactant solution can reduce oil water interfacial tension, subtract Hollow billet resistance, increase capillary number and the raising oil displacement efficiency of small oleophylic oil reservoir, therefore, suitable surfactant can be preferably Solve the above problems, screening is applicable in the Main Basiss of oil displacement surfactant, and to be that can it be down to oil water interfacial tension ultralow (10-3mN/m)。
At present, it is the anion surfactant based on sodium salt to use most surfactant oil displacements both at home and abroad, This kind of surfactant has the advantages that source is wide, quantity is big, low-cost, and is applied successfully in common oil reservoir (CN1458219A).But the salt resistant character of anion surfactant is poor, nonionic surfactant is temperature sensitive, Easily separate out, should not largely use under high temperature.For this reason, people have started the research of amphoteric surfactant, amphion surface Existing anionic hydrophilic base has cationic hydrophilic base and shows both sexes again in active agent molecule, can substantially reduce non-ionic table Chromatographic fractionation effect when face activating agent is compounded with anionic surfactant.Since last century the seventies, Ren Menyan The interaction between amphoteric surfactant and other type surfactants is studied carefully, in document《Surfactants Detergents》Mentioned in 2010, vol13 isothermal by the surface tension to alpha-decyl betaine (α-DB)/SDS systems Research, it is found that compound system shows stronger cooperative effect in reduction surface tension, formation micella etc., form one Kind vermiculate glues.Patent CN201310166961.5 proposes the vermiculate glues that a kind of anion surfactant is formed Displacement composition, can improve recovery ratio to a certain degree.Vermiculate glues is in a kind of state of dynamic equilibrium, i.e., opposite Constantly divide in short time scale, polymerize again.Since vermiculate glues has high surface, high viscosity and high shear Etc. characteristic, have broad application prospects.Therefore, the research and development of the glutinous bullet surfactant with vermiculate glues obtain People more and more pay attention to and concern, have become one of hot spot of tertiary oil recovery field research.
For this reason, the present invention provides a kind of steady chemical structure under the conditions of alkali-free, high temperature LOW PERMEABILITY RESERVOIR, can be formed with crude oil 10- 3~10- 4MN/m ultralow interfacial tensions, the new oil displacement system for effectively improving oil recovery factor, i.e., live including glycine betaine surface The alkali-free of property agent, anion surfactant and water sticks bullet surface activator composition, by control surface activating agent from group Dress makes body mutually have high viscosity, while surfactant has high interfacial activity in itself, so as to improve adopting for LOW PERMEABILITY RESERVOIR Yield, is extended in the application in the harsh oil field of the hypotonic grade of high temperature.
The content of the invention
The first technical problem to be solved by the present invention is that the polymer in existing chemical flooding is used for the LOW PERMEABILITY RESERVOIR displacement of reservoir oil Formation blockage is be easy to cause in journey, injects the problem of difficult, there is provided a kind of composition of new glutinous bullet surfactant, the surface Activating agent has the characteristics that oil displacement efficiency is high under the conditions of high temperature is hypotonic, is particularly suitable for husky seven oil fields of Jiangsu oilfield.
The second technical problem to be solved by the present invention is to provide a kind of with solving one of technical problem corresponding glutinous bullet The preparation method of composition of surfactant.
The third technical problem to be solved by the present invention is to provide a kind of with solving one of technical problem corresponding glutinous bullet The composition of surfactant is used for the flooding method in LOW PERMEABILITY RESERVOIR.The glutinous composition for playing surfactant is suitable for logical The rock core of normal permeability, in view of the displacement of reservoir oil of low permeability cores faces the difficulty of bigger in this area, the present invention is distinguished by that Suitable for the rock core of low-permeability.Such as it is 0.1 that above-mentioned technical proposal, which is distinguished by using the core permeability scope, ~500mD;It is 2~40mD to be more distinguished by suitable for the core permeability scope.
To solve one of above-mentioned technical problem, the technical solution adopted by the present invention is as follows:A kind of alkali-free sticks bullet surface-active Agent composition, including beet alkali surface activator, anion surfactant and water, the beet alkali surface activator and it is cloudy from The molar ratio of sub- surfactant is 1: 0.01~1: 100;The glycine betaine Surfactant is in the structure as shown in (I) in formula At least one:
In formula (I), R1Selected from C8~C29Alkyl, at least one of alkenyl, the R2And R3It is independently chosen from C1~ C5Alkylidene, at least one of hydroxyl substituted alkylene, the R4And R5It is independently chosen from C1~C4Alkyl, hydroxyl takes At least one of substituted alkyl;More preferably R4And R5Methyl is selected from, at this time, the glycine betaine Surfactant is in such as formula At least one of structure shown in (I '):
At this time, with acylate combined interface tension force performance more preferably;
The anion surfactant is selected from least one of structure as shown in (II) in formula:
X is selected from least one of carboxylate radical, sulfonate radical in formula (II).
Preferred R in above-mentioned technical proposal1For C12~C25At least one of alkyl or alkenyl, R2For C2~C3Alkylene At least one of base or hydroxyl substituted alkylene, R3For C1~C3Alkylidene.
The most preferred technique scheme from the angle for improving recovery ratio, above-mentioned technical proposal:R is C16~C22Alkyl Or at least one of alkenyl, R2For C3Alkylidene or at least one of hydroxyl substituted alkylene, R3For C1~C2Alkylene Base;Anion surfactant is selected from least one of naphthalene sulfonate and alkyl substitution naphthalene-carboxylic acid salt.
Interfacial tension is reduced from collaboration, improves the consideration of recovery ratio angle, and in above-mentioned technical proposal, the glycine betaine surface is lived Property agent be selected from it is two or more in structure shown in formula (I) or formula (I '), such as R1The different two or more glycine betaine tables of carbon number Face activating agent, at this time, R1The different two or more beet alkali surface activators of carbon number have with anion surfactant Good synergistic function, such as preferred R1For C15~C29Long carbon chain carboxylate beet alkali surface activator and R1For C8~C14 Short carbon chain carboxylate beet alkali surface activator two or more combinations.
In above-mentioned technical proposal, the molar ratio of the amphoteric surfactant and acylate is preferably (1:0.1)~ (1:10)。
In above-mentioned technical proposal, the displacement of reservoir oil further includes water with the composition of Surfactant Used in Viscoelastic Fracturing Fluids, especially suitable for surface Surfactant waterflood.
To solve the two of above-mentioned technical problem, the technical solution adopted by the present invention is as follows:Described in one of above-mentioned technical problem The preparation method of the glutinous composition for playing surfactant, comprises the following steps:
A) by aliphatic acid acid or its ester and required amidation reagent when 100~160 DEG C of reactions 3~20 are small;Then plus Enter carboxylating reagent ZR3COOM in 50~100 DEG C the reaction was continued 2~20 it is small when, obtain the glycine betaine surface-active described in formula (I) Agent;Wherein, fatty acid methyl ester:Amidation reagent:The molar ratio of carboxylating reagent is 1:(1~3):(1~4);Z be selected from hydrogen, hydroxyl, Any one in halogen, amino, any one of M in alkali metal, alkaline-earth metal, ammonium ion;
B) it is dissolved in water by anion surfactant and according to the obtained beet alkali surface activators of step a), It is then (1 according to molar ratio:0.1)~(1:10) it is uniformly mixed, obtains the surface activator composition.
In above-mentioned technical proposal, step a) preferred amides reagent is NH2-R2-N(CH3)2;Glycine betaine surface in step b) Activating agent is (1 with anion surfactant molar ratio preferred scope:0.1)~(1:10).
It is as follows to solve three the technical solution adopted by the present invention of present invention problem:A kind of displacement of reservoir oil in LOW PERMEABILITY RESERVOIR Method, including the displacement of reservoir oil will be carried out in the displacement composition injection low-permeability oil pool.
Core permeability scope any one of above-mentioned technical proposal is 0.1~500mD;More it is distinguished by applicable In the core permeability scope be 2~40mD.
Amphion and the surfactant of anion compounding in glutinous bullet surfactant flooding agent prepared by the present invention, by After anion and zwitterionic surfactant compounding, you can show viscosity rise, the increase of surface-active, critical micell The advantages that decline of concentration, solubilized effect.This is because the hydrophilic group in anion surfactant is lived with amphion surface Property agent in positive charge there are electrostatic attraction effect, the repulsive interaction between solution surface like charges can be reduced, and the two is dredged Water base hydrocarbon interchain also has certain hydrophobic effect, promotes different surfaces active agent molecule to take even closer arrangement mode, " association that so as to the surface-active with higher, simultaneously because strong electrical function, two kinds of surfactants can form new After thing ", vermiculate glues is more likely formed in the solution, so as to reduce the critical micelle concentration of compound surfactant so that Surfactant has certain viscoplasticity, can play the role of polymer in poly- table oil displacement agent and otherwise block narrow and small pore throat, It is advantageous to improve the oil displacement efficiency of low-permeability oil deposit.Two kinds of surfactants in compound surfactant are ion Type, built agent also show the feature of ionic surface active agent, i.e., excellent heat resistance.Therefore, which both had There is excellent heat-resisting property, and there is excellent interfacial activity, surfactant can be solved and be unable to reach 10-3The ultralow interfaces of mN/m The problem of tension value so that surfactant can still be protected during tertiary oil recovery in the migration process of underground and use table of the present invention Face surfactant composition, has interfacial activity height.
Technical solution using the present invention, under the conditions of compound surfactant composition dosage is 0.01~1w.t.%, In salinity in 30,000 mg/L, seven live water of calcium ions and magnesium ions content 400mg/L sand, remain to form 10 with underground crude oil-3~10- 4The ultralow interfacial tension of mN/m;Washing oil ability is strong, improves recovery ratio up to 15.1%;Surface activator composition system is simple The advantages that, achieve preferable technique effect.
Below by embodiment, the present invention is further elaborated.
Embodiment
【Embodiment 1】
1. prepared by surfactant
(1) erucyl amide carboxyl betaine surfactant (R1=C21, R2=C3、R3=C2) preparation
A) 0.5 mole of methyl erucate and the desired amount of amidation reagent N, N- dimethylated propyl diethylenetriamine are added into reaction kettle In, when 140 DEG C of reactions 8 are small, vacuum pump is opened, extracts methanol and excessive N that reaction produces, N- dimethylated propyl diethylenetriamines, obtain To erucic acid acyl group tertiary amine product, the desired amount of sodium chloroacetate is added, when 75 DEG C of reactions 9 are small, is carried with absolute ethyl alcohol recrystallization Long carbon chain beet alkali surface activator is obtained after pure;Wherein, methyl erucate:N, N- dimethylated propyl diethylenetriamine:Mole of sodium chloroacetate Than for 1:2.5:1.5.
B) erucyl amide carboxyl betaine surfactant prepared by naphthalene sulfonate and the present invention is dissolved in water, Stirring 30 minutes, is configured to aqueous solution, then by above-mentioned surfactant according to beet alkali surface activator and anionic surface Activating agent molar ratio is 1:0.7 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
A) viscosity measurement
Using III type viscosimeters of U.S. Brookfield DV-, at 85 DEG C, rotating speed 7.34S-1Under the conditions of, measure is above-mentioned The oil displacement agent of 0.3% concentration and the viscosity of the husky seven Oil Field water (being shown in Table 3) in Jiangsu the results are shown in Table 2.
B) interfacial tension is evaluated
TX-500C rotating interfacial tensimeters, at 85 DEG C, rotating speed 6000 are produced using Texas ,Usa university Under the conditions of rev/min, the interfacial tension knot between the dewatered oil in husky seven oil fields of oil displacement agent and Jiangsu for measuring above-mentioned 0.1% concentration Fruit is shown in Table 2.
C) oil displacement experiment is evaluated
According to the composite oil-displacing system physical simulation flooding test in SY/T6424-2000 composite oil-displacing system performance test methods Measure of merit, at 87 DEG C, length 30cm, a diameter of 2.5cm, permeability is to carry out imitation oil displacement experiment on the rock core of 20 millidarcies Experiment.Water drive is first carried out to aqueous 98%, after water drive, the oil displacement agent of metaideophone 0.3pv (rock pore volume) above-mentioned 0.3% Afterwards, then water drive to aqueous 100%, improves oil recovery factor and the results are shown in Table 2.
【Embodiment 2】
1. prepared by surfactant
(1) triacontanoic acid amido carboxyl beet alkali surface activator (R1=C29, R2=C2、R3=C2) preparation
A) 0.5 mole of Long carbon chain triacontanoic acid methyl esters and the desired amount of amidation reagent N, N- dimethyl-ethylenediamine are added In reaction kettle, when 130 DEG C of reactions 6 are small, vacuum pump is opened, extracts methanol and excessive N that reaction produces, N- dimethyl second two Amine, obtains triacontanoic acid acyl group tertiary amine product, adds the desired amount of sodium chloroacetate, when 85 DEG C of reactions 15 are small, through absolute ethyl alcohol Long carbon chain beet alkali surface activator is obtained after recrystallization purification;Wherein, triacontanoic acid methyl esters:N, N- dimethyl-ethylenediamine:Chloroethene The molar ratio of sour sodium is 1:2:1.5.
B) triacontanoic acid amido carboxyl beet alkali surface activator prepared by naphthalene sulfonate and the present invention is dissolved separately in water In, stir 30 minutes, aqueous solution is configured to, then by above-mentioned surfactant according to beet alkali surface activator and anion table Face activating agent molar ratio is 1:0.7 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Embodiment 3】
1. prepared by surfactant
(1) n-nonanoic acid amido carboxyl beet alkali surface activator (R1=C8, R2=C3、R3=C3) preparation
A) 0.5 mole of methyl pelargonate and the desired amount of amidation reagent N, N- dimethylated propyl diethylenetriamine are added into reaction kettle In, when 135 DEG C of reactions 10 are small, vacuum pump is opened, extracts methanol and excessive N that reaction produces, N- dimethylated propyl diethylenetriamines, obtain To n-nonanoic acid acyl group tertiary amine product, the desired amount of β-chloropropionic acid sodium is added, when 75 DEG C of reactions 10 are small, is tied again through absolute ethyl alcohol Long carbon chain beet alkali surface activator is obtained after crystalline substance purification;Wherein, methyl pelargonate:N, N- dimethylated propyl diethylenetriamine:β-chloropropionic acid The molar ratio of sodium is 1:2:1.6.
B) n-nonanoic acid amido carboxyl beet alkali surface activator prepared by naphthalene sulfonate and the present invention is dissolved in water, Stirring 30 minutes, is configured to aqueous solution, then by above-mentioned surfactant according to beet alkali surface activator and anionic surface Activating agent molar ratio is 1:0.7 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Embodiment 4】
1. prepared by surfactant
(1) lauric amide carboxyl betaine surfactant (R1=C11, R2=C3、R3=C3) preparation
A) 0.5 mole of methyl laurate and the desired amount of amidation reagent N, N- dimethylated propyl diethylenetriamine are added into reaction kettle In, when 140 DEG C of reactions 10 are small, vacuum pump is opened, extracts methanol and excessive N that reaction produces, N- dimethylated propyl diethylenetriamines, obtain To laurate acyl group tertiary amine product, the desired amount of β-chloropropionic acid sodium is added, when 75 DEG C of reactions 10 are small, with absolute ethyl alcohol weight Long carbon chain beet alkali surface activator is obtained after crystallization and purification;Wherein, methyl laurate:N, N- dimethylated propyl diethylenetriamine:β-chloro The molar ratio of sodium propionate is 1:2.5:1.5.
B) lauric amide carboxyl betaine surfactant prepared by naphthalene sulfonate and the present invention is dissolved separately in water In, stir 30 minutes, aqueous solution is configured to, then by above-mentioned surfactant according to beet alkali surface activator and anion table Face activating agent molar ratio is 1:0.7 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Embodiment 5】
1. prepared by surfactant
By the erucyl amide carboxyl betaine surfactant in embodiment 1, the lauric amide carboxyl sweet tea in embodiment 4 Dish alkali surfactant and naphthalene sulfonate are dissolved in water, and are stirred 30 minutes, aqueous solution are configured to, then by above-mentioned surface Activating agent is according to the both sexes of erucyl amide carboxybetaine, n-nonanoic acid amido carboxyl beet alkali surface activator and anion surface active Agent molar ratio is 0.5:0.5:0.7 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Embodiment 6】
1. prepared by surfactant
By the erucyl amide carboxyl betaine surfactant in embodiment 1, the n-nonanoic acid amido carboxyl beet in embodiment 3 Alkali surfactant and naphthalene sulfonate are dissolved in water, and are stirred 30 minutes, are configured to aqueous solution, then above-mentioned surface is lived Property agent is according to the both sexes of erucyl amide carboxybetaine, n-nonanoic acid amido carboxyl beet alkali surface activator and anion surfactant Molar ratio is 0.5:0.5:0.7 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Comparative example 1】
1. prepared by surfactant
Naphthalene sulfonate and docosyl carboxyl betaine surfactant are dissolved in water, stirred 30 minutes, Aqueous solution is configured to, then by above-mentioned surfactant according to beet alkali surface activator and anion surfactant molar ratio For 1:1 is uniformly mixed, and obtains the glutinous composition for playing surfactant.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Comparative example 2】
1. prepared by surfactant
According to the method described in patent CN103242816B, the surfactant of synthesis such as lower structure:C11H23CON (CH2CH2OH)2, naphthalene sulfonate and the surfactant of synthesis are dissolved in water, stirs 30 minutes, is configured to water-soluble Liquid, is then 1 according to the surfactant and anion surfactant molar ratio of synthesis by above-mentioned surfactant:1 mixing Uniformly, the glutinous composition for playing surfactant is obtained.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
【Comparative example 3】
1. prepared by surfactant
By the erucyl amide carboxyl betaine surfactant in embodiment 1, the n-nonanoic acid amido carboxyl beet in embodiment 3 Alkali surfactant is dissolved in water, and is stirred 30 minutes, aqueous solution is configured to, then by above-mentioned surfactant according to mustard Sour amido carboxyl beet alkali ampholytic, n-nonanoic acid amido carboxyl beet alkali surface activator molar ratio are 1:1 is uniformly mixed, and obtains surface The composition of activating agent.
2. surfactant properties are evaluated
In addition to oil displacement agent composition is different, method of evaluating performance is the same as embodiment 1.For ease of comparing the composition of oil displacement agent Table 1 is listed in, evaluation result is listed in table 2.
Surface activator composition composition in 1 embodiment of table and comparative example
Oil displacement agent performance evaluation in 2 embodiment of table and comparative example
Viscosity (mPa.s) Interfacial tension (mN/m) Improve recovery ratio %
Embodiment 1 20.7 0.0078 14.2
Embodiment 2 16.7 0.0058 13.7
Embodiment 3 15.8 0.0083 12.6
Embodiment 4 15.7 0.0080 12.5
Embodiment 5 22.5 0.00027 15.1
Embodiment 6 21.6 0.00050 14.8
Comparative example 1 9.5 0.012 7.9
Comparative example 2 2.6 0.015 5.1
Comparative example 3 6.0 0.014 8.5
3 Jiangsu oilfield of table sand, seven live water
Unit Na++K+ Mg2+ Ca2+ Cl- SO4 2- HCO3 - TDS
mg/L 8730.8 154 220 10224 1507.7 5152.5 25830

Claims (10)

1. a kind of alkali-free sticks bullet surface activator composition, including beet alkali surface activator, anion surfactant, described The molar ratio of beet alkali surface activator and anion surfactant is 1: 0.01~1: 100;The glycine betaine Surfactant Selected from least one of structure as shown in (I) in formula:
In formula (I), R1Selected from C8~C29Alkyl, at least one of alkenyl, the R2And R3It is independently chosen from C1~C5's At least one of alkylidene, hydroxyl substituted alkylene, the R4And R5It is independently chosen from C1~C4Alkyl, hydroxyl substitution At least one of alkyl;
The anion surfactant is selected from least one of structure as shown in (II) in formula:
X is selected from least one of carboxylate radical, sulfonate radical in formula (II).
2. alkali-free according to claim 1 sticks bullet surface activator composition, it is characterised in that the amphoteric surface lives R in property agent1For C12~C25At least one of alkyl or alkenyl, R2For C2~C3Alkylidene or hydroxyl substituted alkylene in At least one, R3For C1~C3Alkylidene.
3. alkali-free according to claim 2 sticks bullet surface activator composition, it is characterised in that the amphoteric surface lives R in property agent1For C16~C22At least one of alkyl or alkenyl, R2For C3Alkylidene or hydroxyl substituted alkylene in extremely Few one kind, R3For C1~C2Alkylidene.
4. alkali-free according to any one of claim 1 to 3 sticks bullet surface activator composition, it is characterized in that the combination Thing includes water.
5. alkali-free according to claim 1 sticks bullet surface activator composition, it is characterised in that lives on the glycine betaine surface Property agent is R1For C15~C29Long carbon chain carboxylate beet alkali surface activator and R1For C8~C14Short carbon chain carboxylate beet Two or more combinations in alkali surfactant.
6. alkali-free according to claim 1 sticks bullet surface activator composition, it is characterised in that the anionic surface Activating agent is selected from benzene carboxylic acid salt, halo benzene sulfonate, hydroxyl substituted benzenesulfonic acid salt, naphthalene sulfonate and alkyl substitution naphthalene-carboxylic acid salt At least one of.
7. alkali-free according to claim 1 sticks bullet surface activator composition, it is characterised in that the composition also wraps Include water.
8. any alkali-free of claim 1~7 sticks the preparation method for playing surface activator composition, comprise the following steps:
A) by aliphatic acid acid or its ester and required amidation reagent when 100~160 DEG C of reactions 3~20 are small;Then add carboxylic Change reagent ZR3COOM in 50~100 DEG C the reaction was continued 2~20 it is small when, obtain the beet alkali surface activator described in formula (I);Its In, fatty acid methyl ester:Amidation reagent:The molar ratio of carboxylating reagent is 1:(1~3):(1~4);Z be selected from hydrogen, hydroxyl, halogen, Any one in amino, any one of M in alkali metal, alkaline-earth metal, ammonium ion;
B) it is dissolved in water by anion surfactant and according to the obtained beet alkali surface activators of step a), then It is (1 according to molar ratio:0.1)~(1:10) it is uniformly mixed, obtains the surface activator composition.
9. the flooding method in a kind of LOW PERMEABILITY RESERVOIR, including displacement composition injection any one of claim 1~7 is low Permeability, which is hidden, carries out the displacement of reservoir oil.
10. the flooding method in LOW PERMEABILITY RESERVOIR according to claim 9, it is characterised in that the infiltration in the LOW PERMEABILITY RESERVOIR Rate is 1~40mD.
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