CN110357995A - A kind of low-molecular weight polymer and preparation method thereof that end is function modified - Google Patents
A kind of low-molecular weight polymer and preparation method thereof that end is function modified Download PDFInfo
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- CN110357995A CN110357995A CN201910672197.6A CN201910672197A CN110357995A CN 110357995 A CN110357995 A CN 110357995A CN 201910672197 A CN201910672197 A CN 201910672197A CN 110357995 A CN110357995 A CN 110357995A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/52—Amides or imides
- C08F120/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F120/56—Acrylamide; Methacrylamide
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/52—Amides or imides
- C08F120/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F120/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-acryloyl morpholine
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/60—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing nitrogen in addition to the carbonamido nitrogen
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/60—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing nitrogen in addition to the carbonamido nitrogen
- C08F220/606—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing nitrogen in addition to the carbonamido nitrogen and containing other heteroatoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2438/00—Living radical polymerisation
- C08F2438/03—Use of a di- or tri-thiocarbonylthio compound, e.g. di- or tri-thioester, di- or tri-thiocarbamate, or a xanthate as chain transfer agent, e.g . Reversible Addition Fragmentation chain Transfer [RAFT] or Macromolecular Design via Interchange of Xanthates [MADIX]
Abstract
The present invention relates to a kind of low-molecular weight polymers and preparation method thereof that end is function modified, the method is low-molecular-weight polymeric monomer and RAFT agent under initiator existence condition, copolyreaction is carried out by radical polymerization, obtains the function modified low-molecular weight polymer in end；The low-molecular-weight polymeric monomer is betaine type amphipathic polymer monomer, acrylamide monomer, one of quaternary Long carbon chain associating monomer, 2- acrylamide-2-methyl propane sulfonic or a variety of；The both ends of the polymer of formation are respectivelyFor 1-3 andFunctional group, n 2-4 are connected with each other polymerized monomer end by this noncovalent interaction of host-guest inclusion.Polymer molecular weight control is 1,000,000 hereinafter, the fast quick-recovery in the underground of solution viscosifies after shearing.
Description
Technical field
The invention belongs to polymer material preparation technical fields, and in particular to a kind of low molecular weight that end is function modified is poly-
Close object and preparation method thereof.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty
It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art
Art.
China's Reservoir Heterogeneity is strong, and recovery ratio is low, and chemical flooding potentiality are big.As domestic waterflooding oil field main body enters
" double height " development phase of High water cut, high recovery percent of reserves, the polymer flooding chemical flooding important as one improve recovery efficiency technique,
It industrial applications and is rapidly developed in China, becomes the important technical in the stage oil field " steady oil control water ".Conventional polymer
Oil displacement agent partially hydrolyzed polyacrylamide (PHPA) (HPAM) has that heat-resistant salt-resistant resistant to shearing ability is poor, therefore contains hydrophobic grouping
Amphipathic polymer developed.
Although being not fully applicable in however, existing polymeric system is promoted in performance offshore oilfield.It is poly-
Object is closed to be difficult to meet the rapidly-soluble demand of offshore platform.Offshore platform space is small, it is difficult to by increasing curing tank or extending ripe
The problems such as changing the time improves polymer solute effect, and polymer solute effect reduces, flake is easily caused to block, can not only weaken poly-
Object itself tackifying and oil displacement efficiency are closed, also will cause polymer solution injection pressure virtual height or even blocks stratum.In addition marine
Platform well spacing is big, and polymer easy shear degradation in migration process generates viscosity loss, need to increase polymerization to reach target viscosities
The dosage or molecular weight of object, undoubtedly increase dissolution time and corresponding economic cost.
The molecular weight height of polymer is the main reason for its solution rate is low, for the polymerization by being covalently keyed formation
Object, it is simple to be difficult to be fully solved above-mentioned critical issue using the method for reducing molecular weight.Its difficult point is mainly reflected in: first, with
The polymer molecular weight that the typical polymerization methods such as free radical polymerization obtain is distributed wide, it is difficult to realize the Effective Regulation of molecular weight.The
Two, though polymer solubility can be enhanced by reducing molecular weight, the hydrodynamic radius of polymer is also reduced simultaneously, to weaken
Its tackifying ability.Inventors have found that keeping polymer viscosity while reducing polymer molecular weight is the problem of current techniques.
Summary of the invention
For above-mentioned problems of the prior art, it is an object of the present invention to provide a kind of end is function modified
Low-molecular weight polymer and preparation method thereof.The polymer has thickening property similar with conventional heavy polymer, and
And have molecular weight controllability, instant capacity and viscosity shear restorative, there is very big application potential.The polymer uses
The synthesis of reversible addion-fragmentation chain transfer (RAFT) method, by supramolecular chemistry, passes through non-covalent bond effect for small molecule unit
Form chain-like aggregates are connected, supermolecule polymer is formed.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
In a first aspect, a kind of preparation method for the low-molecular weight polymer that end is function modified, the method is low molecule
Polymerized monomer and RAFT agent are measured under initiator existence condition, copolyreaction is carried out by radical polymerization, is obtained
The function modified low-molecular weight polymer in end；
The low-molecular-weight polymeric monomer is betaine type monomer, acrylamide monomer, quaternary Long carbon chain association list
One of body, 2- acrylamide-2-methyl propane sulfonic are a variety of；
RAFT agent is based on double thioesters type RAFT agents, and being formed has host-guest inclusion and π-π total
The serial RAFT agent of yoke non-covalent bond effect functional group.
In some embodiments, RAFT agent is as shown in formula I,
Wherein α-CD is α-ring paste
Essence, m 1-3, n 2-4.
In some embodiments, the structure of betaine type monomer is as shown in formula II,
In some embodiments, the structural formula of quaternary Long carbon chain associating monomer are as follows:
n1For 11-17；Orn2For 11-
17。
In some embodiments, the structural formula of acrylamide monomer is
By the end of the polymer-modified monomer of chain-transferring agent in the present invention, the both ends for the polymer to be formed are made to be respectivelyFor 1-3 andFunctional group, n 2-4, makes
Obtaining polymerized monomer end can be connected with each other by this noncovalent interaction of host-guest inclusion.
A kind of preparation method of the function modified low-molecular weight polymer in above-mentioned end, specific steps are as follows:
Low-molecular-weight polymeric monomer and RAFT agent are dissolved in deionized water, heated at constant temperature, are passed through nitrogen, injected
Initiator, the product obtained after reaction are purified by ethanol washing, and vacuum drying obtains low-molecular weight polymer.
In some embodiments, low-molecular-weight polymeric monomer mass concentration is 15%~30%；In some embodiments, draw
Hair agent dosage accounts for the 0.01%~0.1% of monomer gross mass；RAFT agent mass concentration is in some embodiments
0.01%~0.2%.The present invention introduces strongly hydrophilic group or strong hydrophobic grouping, synthesizing can by optimization polymer architecture
Suitable for different reservoir conditions and terminal-modified functionalization low polymer.The mass concentration optimum of above range synthesizes
Low-molecular weight polymer.
In some embodiments, the initiation temperature of copolyreaction is 35 DEG C~45 DEG C, and the time of reaction is 5-7h；Some
In embodiment, copolyreaction carries out under inert gas protection；In some embodiments, initiator is azodiisobutyronitrile
(AIBN)。
Second aspect, provides end that above-mentioned preparation method obtains function modified low-molecular weight polymer, and molecular weight is small
In 1,000,000.
In some embodiments, monomer is acrylamide monomer, obtained low-molecular weight polymer as shown in formula V,
Wherein,
M is 1-3, n 2-4.
Reaction route is as follows:
In some embodiments, monomer is betaine type monomer, acrylamide monomer, and the association of quaternary Long carbon chain is single
Body, obtained low-molecular weight polymer as shown in formula VI or VII,
Wherein, m 1-3, n 2-4.
In some embodiments, monomer is quaternary Long carbon chain associating monomer and acrylamide monomer, low point obtained
Sub- weight polymers as shown in formula VIII,
R is C12-C40Linear or branched alkyl group, wherein m 1-3, n 2-4.
In some embodiments, monomer is 2- acrylamide-2-methyl propane sulfonic, obtained low-molecular weight polymer such as formula
Shown in Ⅸ,
Wherein,
M is 1-3, n 2-4.
With existing polymeric system solute effect difference and viscosity loss greatly compared with, the end functions of mentioning in the present invention more
Modified novel low molecular weight weight polymers are with molecular weight controllability, instant capacity and have shear restoration.Its principle is benefit
With double sulphur ester-type efficient chain-transferring agents, using the controllable end of reversible addion-fragmentation chain transfer (RAFT) method synthetic molecular weight
Low-molecular weight polymer, by supermolecule polymer chemistry, by host -guest inclusion complex by small molecule unit by non-covalent
Key effect connects form chain-like aggregates, forms supermolecule polymer and shows and the similar thickening energy of traditional covalent polymer
Power.By control RAFT agent dosage regulate and control polymer chain number, with realize polymer molecular weight control 1,000,000 with
Under, it is ensured that the quick dissolution (25 DEG C, < 30min) of polymer.Furthermore novel low molecular weight polymer by dynamic reversible non-covalent bond
Connection avoids the shortcomings that traditional polymer can not restore after breaking of covalent bonds degradation after high speed shear, after realizing shearing
The fast quick-recovery thickening in the underground of solution.
The third aspect, application of the above-mentioned low-molecular weight polymer in profile control agent or oil displacement agent.
Fourth aspect, a kind of profile control agent, including above-mentioned low-molecular weight polymer.
Above-mentioned profile control agent, including state low-molecular weight polymer 0.05~10.00%, surfactant 0.1%~
10.00%, remaining as water.
The synergistic effect that low-molecular weight polymer and surfactant generate is heat resistance and salt tolerance.Pass through surfactant
Spherical micelle or rod-shaped micelle are formed in a polymer solution, construct out the Weak Gels system of micella synergy polymer associate,
The Efficient Adhesive Promotion of fortification system at low concentrations.
In some embodiments, low molecule amphipathic polymer 0.1~2%, surfactant 1%~2%, remaining as water.
In some embodiments, cationic surface active agent, anionic surfactant, non-ionic surfactant
One of agent or amphoteric ionic surfactant；Preferably Tween 80, OP-10, glucoside, sodium alkyl benzene sulfonate, nonyl
One of base phenol polyethenoxy ether.
The preparation method of above-mentioned profile control agent, specific steps are as follows:
Low molecular weight amphipathic polymer is added in distilled water, surfactant mixing is then added, obtains oil field tune
It drives and uses Weak Gels system.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present application, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is outlet end moisture content with displacement time change；
Fig. 2 is recovery ratio with displacement time variation diagram；
Fig. 3 is the nuclear magnetic spectrum of low-molecular weight polymer prepared by embodiment 1；
Fig. 4 is the nuclear magnetic spectrum of low-molecular weight polymer prepared by embodiment 3.
Beneficial effects of the present invention:
(1) present invention in this end it is function modified novel low molecular weight weight polymers it is with good stability and general
Adaptive.
(2) the function modified novel low molecular weight weight polymers in this end in the present invention have both low molecular weight and self assembly
Ability, and supermolecule polymer is formed by the noncovalent interaction between polymer molecule, there is conventional heavy polymer
Thickening property.
(3) the function modified novel low molecular weight weight polymers in this end in the present invention have instant capacity and shear restoration
Property, it can be connected with each other by host -guest inclusion complex, form the instant supermolecule polymer with shear recovery.
(4) the function modified novel low molecular weight weight polymers in this end in the present invention have molecular weight controllability, benefit
The molecular weight of polymer can be realized accurately to regulate and control with RAFT method, so as to obtain target molecular weight and molecular weight point
The relatively narrow polymeric articles of cloth.
(5) present invention passes through electrostatic interaction, heat resistance and salt tolerance etc. using end-functionalization amphipathic polymer as construction unit
Non-covalent bond effect power constructs supermolecule polymer, and further cooperates with surfactant and construct Weak Gels system, captures
Conventional gel system easily shears the problem of denaturation, and furthermore the system also has good tackifying effect at low concentrations.Of the invention
This end-functionalization amphipathic polymer base Weak Gels system can effectively carry out profile control and water plugging, high permeability formation be blocked, to improve
Inject water swept volume, steady oil control water.
(6) preparation method of the present invention is simple, practical, easy to spread.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the present invention.Unless another
It indicates, all technical and scientific terms used herein has usual with general technical staff of the technical field of the invention
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.Below with reference to embodiment to this hair
Bright further explanation
Embodiment 1:
It accurately weighs a certain amount of acrylamide monomer and RAFT agent is dissolved in a certain amount of deionized water, propylene
The mass concentration of amide monomer is 25%, and the mass concentration of RAFT agent is 0.05%, is subsequently placed in 250mL three-necked flask
In, it is stirred continuously and is allowed to dissolve.Three-necked flask is placed in water bath with thermostatic control, N is passed through2And 0.5 hour is stirred to solution clarification.With
Initiator is azodiisobutyronitrile (AIBN) injection by syringe, and initiator amount is the 0.05% of monomer gross mass.It is warming up to
40 DEG C, continue to be passed through N2It is stirred continuously, three-necked flask sealing is placed 6 hours, finally obtain clear gum product, taking-up is cut into small
Block, three times with ethanol precipitation purification, vacuum dried, granulation low-molecular weight polymer product, calculating yield is 92% or so,
Obtain polymer shown in formula V.Its nuclear magnetic spectrum is as shown in figure 3, the j in Fig. 3 indicates alpha-cyclodextrin.
Embodiment 2:
Accurately weigh a certain amount of 2- acrylamide-2-methyl propane sulfonic (AMPS) and RAFT agent be dissolved in it is a certain amount of
Deionized water in, the mass concentration of monomer is 30%, and the mass concentration of RAFT agent is 0.1%, is subsequently placed in 250mL
In three-necked flask, it is stirred continuously and is allowed to dissolve.Three-necked flask is placed in water bath with thermostatic control, N is passed through2And 0.5 hour is stirred to molten
Liquid clarification.It by initiator is azodiisobutyronitrile (AIBN) injection with syringe, initiator amount is monomer gross mass
0.1%.45 DEG C are warming up to, continues to be passed through N2It is stirred continuously, three-necked flask sealing is placed 6 hours, finally obtain clear gum and produce
Object, taking-up are cut into small pieces, three times with ethanol precipitation purification, vacuum dried, granulation low-molecular weight polymer product.Obtain formula
Polymer shown in Ⅸ.
Embodiment 3
Accurately weigh a certain amount of betaine type monomer (formula II), acrylamide, quaternary Long carbon chain associating monomer (formula
III, n2Be 11) and RAFT agent be dissolved in a certain amount of deionized water, the mass concentration of monomer is that 20%, RAFT chain turns
The mass concentration for moving agent is 0.15%, is subsequently placed in 250mL three-necked flask, is stirred continuously and is allowed to dissolve.Three-necked flask is set
In water bath with thermostatic control, it is passed through N2And 0.5 hour is stirred to solution clarification.It by initiator is azodiisobutyronitrile with syringe
(AIBN) it injects, initiator amount is the 0.05% of monomer gross mass.35 DEG C are warming up to, continues to be passed through N2It is stirred continuously, by three
Mouth flask sealing is placed 5.5 hours, and clear gum product is finally obtained, and taking-up is cut into small pieces, three times with ethanol precipitation purification, through true
The low-molecular weight polymer product that sky is dry, is granulated.Polymer shown in formula VII is obtained, nuclear magnetic spectrum is as shown in Figure 4.
Viscosity test
The low-molecular weight polymer that embodiment 1 is prepared is placed in preparation 2000ppm polymer solution in distilled water, is stirred
12 minutes post-consumer polymers are mixed to be completely dissolved.The viscosity measured after 6rpm shearing 20min is 6952mPas, rear to carry out 600rpm high
Speed is sheared, and the viscosity after high speed shear 10min is 4179mPas, restores to survey under the same conditions after shearing 10min to 6rpm
The viscosity obtained is 6871mPas.
The low-molecular weight polymer that embodiment 3 is prepared is placed in preparation 2000ppm polymer solution in distilled water, is stirred
12 minutes post-consumer polymers are mixed to be completely dissolved.The viscosity measured after 6rpm shearing 20min is 3350mPas, rear to carry out 600rpm high
Speed is sheared, and the viscosity after high speed shear 10min is 2570mPas, restores to survey under the same conditions after shearing 10min to 6rpm
The viscosity obtained is 3321mPas.
Embodiment 4:
This embodiment provide a kind of oil field transfer drive Weak Gels system construct and use process.Add into distilled water
Enter 0.20wt% low-molecular weight polymer (polymer shown in the formula VII that embodiment 3 is prepared, polymer molecular weight about 50 ×
104), it stirs 10 minutes, so that it may so that polymer is sufficiently dissolved and is uniformly mixed；It is added into prepared polymer solution
The neopelex of 2wt% stirs 20 minutes, it is ensured that neopelex is sufficiently dissolved and is uniformly mixed, and is adjusted
Solution ph is saved to oil reservoir physical condition.Viscosity is 25215mPas at 65 DEG C, under the conditions of revolving speed is 6rpm viscosimeter, with
Measuring viscosity under the same conditions after 3000rpm shearing 1min is 23171mPas.
Artificial simulation core plate (45 × 45 × 6cm, average pore 35.86%, upper layer gas permeability 1750 ×
10-3μm2, lower layer's gas permeability 1500 × 10-2μm2) in displacement test, viscosity of crude 50.8mPas (65 DEG C), irreducible water
Saturation degree 25.6%, gel-filled opportunity are aqueous 80%, continue water drive after injecting 0.1PV Weak Gels, accumulative oil recovery factor is
70%, Flooding Efficiency such as Fig. 1~2.
Embodiment 5:
What this embodiment provided a kind of oil field transfer drive Weak Gels system constructs process, is added into distilled water
Low-molecular weight polymer (formula VIII, quaternary Long carbon chain associating monomer molar ratio 1.5%, the polymer molecular weight of 0.10wt%
About 40 × 104), it stirs 10 minutes, so that it may ensure that polymer is sufficiently dissolved and is uniformly mixed；To prepared polymer solution
The middle lauryl glucoside that 1.2wt% is added, is stirred 20 minutes, it is ensured that lauryl glucoside is sufficiently dissolved and is uniformly mixed, and is adjusted
Solution ph is saved to oil reservoir physical condition, 45 DEG C, viscosity metering rotating speed be 6rpm under the conditions of viscosity be 19850mPas, with
Measuring viscosity under the same conditions after 2500rpm shearing 1min is 18734mPas.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method for the low-molecular weight polymer that end is function modified, it is characterised in that: the method is low molecule
Polymerized monomer and RAFT agent are measured under initiator existence condition, copolyreaction is carried out by radical polymerization, is obtained
The function modified low-molecular weight polymer in end；
The low-molecular-weight polymeric monomer is betaine type monomer, acrylamide monomer, quaternary Long carbon chain associating monomer, 2-
One of acrylamide-2-methyl propane sulfonic is a variety of；
RAFT agent is based on double thioesters type RAFT agents, and being formed has host-guest inclusion and π-pi-conjugated non-
The serial RAFT agent of covalent bond effect functional group.
2. the preparation method of the function modified low-molecular weight polymer in end according to claim 1, it is characterised in that:
RAFT agent as shown in formula I,
Wherein α-CD is alpha-cyclodextrin, m
For 1-3, n 2-4.
3. the preparation method of the function modified low-molecular weight polymer in end according to claim 1, it is characterised in that: tool
Body step are as follows:
Low-molecular-weight polymeric monomer and RAFT agent are dissolved in deionized water, heated at constant temperature, are passed through nitrogen, injection causes
Agent, the product obtained after reaction are purified by ethanol washing, and vacuum drying obtains low-molecular weight polymer；
Preferably, low-molecular-weight polymeric monomer mass concentration is 20%~30%；
Preferably, initiator amount accounts for the 0.01%~0.1% of monomer gross mass；
Preferably, RAFT agent mass concentration is 0.01%~0.2%；
Preferably, the initiation temperature of copolyreaction is 35 DEG C~45 DEG C, and the time of reaction is 5-7h；
Preferably, copolyreaction carries out under inert gas protection；
Preferably, initiator is azodiisobutyronitrile.
4. the function modified low-molecular weight polymer in the end that the described in any item preparation methods of claim 1-3 obtain；
Preferably, molecular weight is less than 1,000,000；
Preferably, monomer is acrylamide monomer, obtained low-molecular weight polymer as shown in formula IV,
Wherein, m 1-
3, n 2-4.
5. the function modified low-molecular weight polymer in end as claimed in claim 4, which is characterized in that monomer is betaine type list
Body, obtained low-molecular weight polymer as shown in formula VI or formula VII,
Wherein, m 1-3, n 2-4.
6. the function modified low-molecular weight polymer in end as claimed in claim 4, which is characterized in that monomer is that quaternary is long
Carbochain associating monomer and acrylamide monomer, obtained low-molecular weight polymer as shown in formula VI,
R is
C12-C40Linear or branched alkyl group, wherein m 1-3, n 2-4.
7. the function modified low-molecular weight polymer in end as claimed in claim 4, which is characterized in that monomer is 2- acryloyl
Amine -2- methyl propane sulfonic acid, obtained low-molecular weight polymer as shown in formula Ⅸ,
Wherein, m 1-
3, n 2-4.
8. the function modified low-molecular weight polymer in the described in any item ends claim 4-7 is in profile control agent or oil displacement agent
Using.
9. a kind of profile control agent, which is characterized in that including the function modified low molecular weight in the described in any item ends claim 4-7
Polymer.
10. profile control agent as claimed in claim 9, which is characterized in that including stating low-molecular weight polymer 0.05~10.00%, table
Face activating agent 0.1%~10.00%, remaining as water；
Preferably, low molecule amphipathic polymer 0.1~2%, surfactant 1%~2%, remaining as water；
Preferably, cationic surface active agent, anionic surfactant, nonionic surface active agent or amphoteric ion
One of type surfactant；Preferably Tween80, OP-10, glucoside, sodium alkyl benzene sulfonate, nonylphenol polyoxyethylene ether
One of；
Preferably, the preparation method of above-mentioned profile control agent, specific steps are as follows:
Low molecular weight amphipathic polymer is added in distilled water, surfactant mixing is then added, obtains oil field transfer drive use
Weak Gels system.
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