CN105566540B - A kind of polymer and its application - Google Patents
A kind of polymer and its application Download PDFInfo
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- CN105566540B CN105566540B CN201410541634.8A CN201410541634A CN105566540B CN 105566540 B CN105566540 B CN 105566540B CN 201410541634 A CN201410541634 A CN 201410541634A CN 105566540 B CN105566540 B CN 105566540B
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Abstract
The invention discloses a kind of polymer and its application, the polymer is prepared by the following method：In the presence of solvent, in the presence of initiator, the monomer containing acrylamide is subjected to polymerisation, the initiator contains the first initiator and the second initiator, and first initiator is azo-initiator, shown in second initiator such as formula (1), wherein, R1And R2It is each independently C1‑C5Straight or branched alkyl, R3For H or C1‑C5Straight or branched alkyl, two R1, two R2, two R3It is identical or different respectively；N is 26 integer.Compared with using only the polyacrylamide of azo-initiator and/or redox initiator, polymer of the invention not only has higher molecular weight, and has higher apparent viscosity and Heat Aging Viscosity retention rate, has higher stability as oil displacement agent.
Description
Technical field
The present invention relates to a kind of polymer, and application of the polymer as oil displacement agent.
Background technology
Polymer flooding is mainly the polymer solution by injecting certain scale, increases displacement fluid viscosity, reduces oil-reservoir water
Phase permeability come reduce mobility ratio, adjustment intake profile, with reach improve displacement phase volume purpose, and then improve recovery ratio.
Polyacrylamide (PAM) is the wide variety of chemical agent for intensified oil production in oil field.It is presently used for acrylamide polymerization
Conventional initiator mainly has azo-initiator, such as azo-bis-isobutyrate hydrochloride (being abbreviated as AIBA, alias V50), azo
Two isobutyl imidazoline hydrochlorides (being abbreviated as AIBI, alias VA-044)；And redox initiation system, such as ammonium persulfate-
Sodium hydrogen sulfite system etc..When these initiator amounts are smaller, the reaction speed of monomer polymerization is slow, simultaneously because polymerization is not filled
Point, partial monosomy residual can be made in the polymer；When initiator amount is higher, excessive initiator easily remains in polymer
In solution, it will influence the stability (such as heatproof, resistance to ag(e)ing) of polymer oil-displacing agent.
The molecular weight of polymer is the important factor in order of oil displacement efficiency, and the molecular weight of general polymerization thing is more high more easily to be obtained
Obtain higher oil displacement efficiency.Above-mentioned initiator is single functionality initiator, compared with the initiator of bifunctionality, its polymerization efficiency
It is low, it is not easy to prepare the polymer of HMW.
JP2002086603A discloses a kind of bifunctionality Redox Initiator body for polymerization of aqueous solution of acrylamide
System, but the oxidant of the initiation system is insoluble in water, and trigger activity not high.Reducing agent corresponding to it is Fe2+, it is raw after initiation
Into Fe3+Inhibition can be produced to polymerization system, so as to which the product degree of polymerization in PAM polymerization later stages and the stabilization of product can be influenceed
Property.
With the raising that oil field is required oil displacement agent cost performance, how further to improve PAM molecular weight as well as
The stability of oil displacement agent turns into the study hotspot of industry.
The content of the invention
It is an object of the invention to solve the drawbacks described above of prior art, so as to provide a kind of polymer, and the polymerization
Application of the thing as oil displacement agent.
The invention provides a kind of polymer, the polymer is prepared by the following method：
In the presence of solvent, in the presence of initiator, the monomer containing acrylamide is subjected to polymerisation, the initiation
Agent contains the first initiator and the second initiator, and first initiator is azo-initiator, the second initiator such as formula
(1) shown in：
Wherein, R1And R2It is each independently C1-C5Straight or branched alkyl, R3For H or C1-C5Straight or branched alkane
Base, two R1, two R2, two R3It is identical or different respectively；N is 2-6 integer.
Present invention also offers application of the above-mentioned polymer as oil displacement agent.
The polymer of the present invention is drawn jointly by the bifunctional initiator with specific structure and azo-initiator
Send out made of the monomer containing acrylamide, with the polyacrylamide using only azo-initiator and/or redox initiator
Amine is compared, and polymer of the invention not only has higher molecular weight, and is protected with higher apparent viscosity and Heat Aging Viscosity
Rate is stayed, there is higher stability as oil displacement agent.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The invention provides a kind of polymer, the polymer is prepared by the following method：
In the presence of solvent, in the presence of initiator, the monomer containing acrylamide is subjected to polymerisation, wherein, institute
State initiator and contain the first initiator and the second initiator, first initiator is azo-initiator, and described second triggers
Shown in agent such as formula (1)：
Wherein, R1And R2It is each independently C1-C5Straight or branched alkyl, R3For H or C1-C5Straight or branched alkane
Base, two R1, two R2, two R3It is identical or different respectively；N is 2-6 integer.
In the present invention, the C1-C5The example of straight or branched alkyl include but is not limited to：Methyl, ethyl, n-propyl,
Isopropyl, normal-butyl, sec-butyl, isobutyl group, the tert-butyl group, n-pentyl, isopentyl, tertiary pentyl and neopentyl.
In formula (1), the group R on phenyl ring3The ortho positions of carbonyl group-containing groups can be connected to, in meta or para position.It is excellent
Select group R3It is connected in the contraposition of carbonyl group-containing groups, i.e. shown in second initiator such as formula (2)：
It is highly preferred that in second initiator, R1And R2It is methyl, R3For H.
In the present invention, second initiator can be prepared by following methods.Specifically, described second is prepared to draw
The method of hair agent can include：In the presence of an inert solvent, make at least one compound A and compound B carry out condensation reaction with
Remove HX；Wherein, shown in the compound A such as formulas (3), shown in the compound B such as formulas (4),
Wherein, R1' and R2' it is each independently C1-C5Straight or branched alkyl, R3' it is H or C1-C5Straight chain or branch
Alkyl group, X are halogen, and such as chlorine, bromine or iodine, n ' is 2-6 integer.The C1-C5Straight or branched alkyl with it is above-described
It is identical, it will not be repeated here.
In formula (3), the group R on phenyl ring3' ortho positions of carbonyl group-containing groups can be connected to, in meta or para position.From raising
The angle of the second initiator yield is set out, preferred group R3' be connected in the contraposition of carbonyl group-containing groups, i.e. the chemical combination
Shown in thing A such as formulas (5)：
It is highly preferred that in formula (5), R1' and R2' it is methyl, R3' it is H, X is bromine, i.e. the compound A is the bromo- 2- of 2-
Methyl phenyl ketone.
The instantiation of the compound B includes but is not limited to：Triethylene tetramine, pentaethylene hexamine, the amine of six ethene seven.
According to the preparation method of second initiator, the compound A and compound B dosage can be condensation reaction
Middle conventional selection, usually, the compound A and the mol ratio of compound B dosages can be 1.5-3：1.
According to the preparation method of second initiator, the atent solvent can be conventional use of each in condensation reaction
Kind solvent.The atent solvent is as reaction medium, there is provided reacting environment, as long as therefore the compound A and change can be dissolved
Compound B, such as can be at least one of ethanol, acetone, benzene,toluene,xylene, chloroform and hexamethylene.It is described lazy
Property solvent dosage can be selected according to the dosage of reactant (compound A and compound B), the usual atent solvent with
The mass ratio of the total dosage of reactant can be 0.5-5：1.
In the preparation process of second initiator, preferably described reaction is carried out in the presence of base catalyst.The alkali
Catalyst can be selected from sodium hydroxide, sodium carbonate, potassium carbonate, barium hydroxide, calcium hydroxide, sodium alkoxide and aluminium alcoholates.Usually, it is described
Base catalyst and the mol ratio of the compound A dosages can be 0.5-0.8：1.
Preferably, compound A is added drop-wise in compound B and reacted, so that the compound A and compound B
Fully reaction.The reaction is carried out under agitation, and the temperature of the reaction can be 0-20 DEG C, and the time of the reaction can be
1-5 hours.Wherein, when compound A is added drop-wise to reacted in compound B when, time of the reaction refer to compound A from
Start to be added drop-wise to the time at the end of reacting.
According to the preparation method of second initiator, in order to improve the purity of second initiator, preferably described side
Method also includes：The reacted reaction systems of compound A and compound B are purified.The detailed process of the purification is ability
The conventional selection in domain, will not be repeated here.
The conventional selection that the azo-initiator that polymer of the invention uses can be this area is prepared, typically may be used
With selected from azodiisobutyronitrile, 2,2 '-azo group-bis- (2- amidine propanes) (ABAP), azo-bis-isobutyrate hydrochloride (V50) and
At least one of isobutyl imidazoline hydrochloride (VA-044) of azo two.
Contain hydrophilic radical amino in the structure of second initiator, be the photoinitiator of water-soluble bifunctionality.
In order to further improve the molecular weight of the polymer, preferably described polymerisation is carried out under the conditions of ultraviolet radioactive, described molten
Agent is water.The temperature of the polymerisation can be 0-30 DEG C.
Under above-mentioned preferable case, more preferably described first initiator is azo-bis-isobutyrate hydrochloride and/or azo two
Isobutyl imidazoline hydrochloride.
According to the polymer of the present invention, the mass ratio of first initiator and second initiator amount can be 1：
1-20, preferably 1：3-15.
In the present invention, the dosage of the initiator can be selected according to the dosage of monomer, usually, the initiator
Mass ratio with the monomer dosage containing acrylamide can be 1：100-1.0×105, preferably 1：1.0×103-1.0
×105。
In the present invention, the wavelength of the ultraviolet light of preferably described ultraviolet radiation is 300-400nm, so can further be carried
Stability of the high polymer as oil displacement agent.In the case of excellent herein, the time of the polymerisation can be 1-5 hours.
According to the polymer of the present invention, it is not particularly limited for the amount of the water as solvent, can is the normal of this area
Advise dosage.Under preferable case, on the basis of the acrylamide of 100 parts by weight, the amount of water is 100-2000 parts by weight.In the amount of water
When within above range, hot-spot can be further avoided, so as to be easier to prevent polymerization system heating too fast.It is more excellent
Selection of land, on the basis of 100 parts by weight propylene acid amides, the amount of water is 200-1000 parts by weight.
The polymerisation can be carried out in the presence of an inert gas.The inert gas is not occur with raw material and product
The gas of reaction, such as can be at least one in group 0 element gas in this area conventional nitrogen or the periodic table of elements
Kind, preferably nitrogen.
The polymerisation can also be carried out in the presence of chelating agent, so that the polymer of the present invention is made.The chelating agent
Preferably disodium ethylene diamine tetraacetate (EDTA-2Na), triethylenediamine pentaacetic acid, citric acid, citrate and poly- hydroxy acrylic acid
At least one of, more preferably EDTA-2Na and/or citrate, the citrate for example can be citric acid
Potassium, sodium citrate, calcium citrate and ammonium citrate etc..It is described on the basis of the integral molar quantity containing acrylamide monomer
The dosage of chelating agent can be 0-1 moles of %, preferably 0.001-0.05 moles of %.
In the present invention, according to the use condition of the polymer, the polymer can pass through the equal of acrylamide monomer
It is poly- to be made, it can also be made by acrylamide and the combined polymerization of other monomers (such as acrylic acid).It is preferred that the polymer passes through
The homopolymerization of acryloyl monomer is made, i.e. the monomer containing acrylamide is acrylamide, so can further improve institute
State stability of the polymer as oil displacement agent.
In order to which the polymer as oil displacement agent is made, the preparation process of the polymer can also include will be described poly-
Close the polyacrylamide that reaction obtains to be granulated, be then hydrolyzed and dry.
In the present invention, the condition of the hydrolysis is not particularly limited, and the condition of the hydrolysis can include：Temperature is
50-110 DEG C, preferably 70-90 DEG C；Time is 0.5-4 hours, preferably 1-2 hours；The hydrolysis causes institute after polymerisation
The degree of hydrolysis for obtaining polyacrylamide can be 10-30%, so as to which the polymer of the present invention be made.
Those skilled in the art could be aware that the process of hydrolysis includes contacting hydrolytic reagent with polyacrylamide.
By hydrolysis, some acrylamide construction unit is transformed into acrylates construction unit.
In the present invention, the degree of hydrolysis refers in polyacrylamide, and the molal quantity of acrylates construction unit accounts for this
The percentage of the construction unit total mole number of the polyacrylamide of invention.The degree of hydrolysis by hydrolytic reagent of the present invention dosage
It is determined that.
In the present invention, the hydrolytic reagent is the various inorganic alkaline chemical combination that can realize above-mentioned purpose commonly used in the art
Thing, can be selected from the one or more in sodium hydroxide, potassium hydroxide and sodium carbonate.The dosage of the hydrolytic reagent can be according to poly-
The hydrolysis degree of acrylamide carries out appropriate selection, so that the hydrolysis degree of polyacrylamide meets that requirement is defined, i.e.
Inorganic alkaline compound dosage make it that the degree of hydrolysis of polyacrylamide is 10-30%.
In the present invention, the molal quantity of the inorganic alkaline compound dosage is equal to mole of acrylates construction unit
Number.
Present invention also offers application of the above-mentioned polymer as oil displacement agent.The polymer of the present invention can be used as oil displacement agent
Use, with it is traditional with polyacrylamide made from azo and/or redox system compared with, with the present invention polymer make
There is higher molecular weight and Heat Aging Viscosity retention rate for oil displacement agent.
The present invention will be described in detail by way of examples below.
In following preparation example and embodiment, the bromo- 2- methyl phenyl ketones of 2- are purchased from aldrich chemical Reagent Company, acryloyl
Amine monomers are purchased from Shandong Polymer Bio-Chemicals Co., Ltd..
The performance test of product is carried out using following methods：
1st, the method according to specified in the People's Republic of China (PRC) oil and gas industry standard SY/T5862-2008 determines
Solid content, dissolution time, filtration ratio, AM residual monomer contents and the intrinsic viscosity of polymer.
2nd, polymer viscosity average molecular weigh method according to specified in SY/T5862-2008, using formula M=([η]/
0.000373)1.515To calculate, wherein, M is viscosity average molecular weigh, and [η] is intrinsic viscosity.
3rd, the apparent viscosity of polymer solution is that polymer is made into 1500mg/L's with salinity 32000mg/L salt solution
Solution, with Brookfield viscosimeters at 85 DEG C, 7.34s-1Under the conditions of determine before aging and 60 days post-consumer polymer solution of aging
Apparent viscosity.
The apparent of the apparent viscosity of polymer solution after apparent viscosity retention rate=aging/aging prepolymer solution is glued
Degree × 100%.
Preparation example 1
This preparation example is used to illustrate second initiator of the present invention and preparation method thereof.
13.6 grams of bromo- 2- methyl phenyl ketones of (0.06 mole) 2- are dissolved in 100mL absolute ethyl alcohols, ice-water bath stirring is lower to be added
Enter 5 grams of potassium carbonate, 7 grams of (0.03 mole) pentaethylene hexamines (being purchased from aldrich chemical Reagent Company) are added dropwise, drip within 10 minutes
Finish, be stirred for reaction 2 hours, filter out bromide precipitation.Filtrate at 25 DEG C is removed into ethanol with rotary evaporator, knot of laying equal stress on
It is brilliant three times, obtain the bifunctional initiator shown in formula (6)：
Preparation example 2
This preparation example is used to illustrate second initiator of the present invention and preparation method thereof.
13.6 grams of bromo- 2- methyl phenyl ketones of (0.06 mole) 2- are dissolved in 100mL absolute ethyl alcohols, ice-water bath stirring is lower to be added
Enter 5 grams of potassium carbonate, 4.38 grams of (0.03 mole) triethylene tetramines (being purchased from aldrich chemical Reagent Company) are added dropwise, drip within 10 minutes
Add it is complete, be stirred for reaction 2 hours, filter out bromide precipitation.Filtrate at 25 DEG C is removed into ethanol with rotary evaporator, and
Recrystallization three times, obtains the bifunctional initiator shown in formula (7)：
Preparation example 3
This preparation example is used to illustrate second initiator of the present invention and preparation method thereof.
13.6 grams of bromo- 2- methyl phenyl ketones of (0.06 mole) 2- are dissolved in 100mL absolute ethyl alcohols, ice-water bath stirring is lower to be added
Enter 5 grams of potassium carbonate, 8.25 grams of amine of (0.03 mole) six ethene seven (being purchased from aldrich chemical Reagent Company) are added dropwise, drip within 15 minutes
Add it is complete, be stirred for reaction 2 hours, filter out bromide precipitation.Filtrate at 25 DEG C is removed into ethanol with rotary evaporator, and
Recrystallization three times, obtains the bifunctional initiator shown in formula (8)：
Embodiment 1
The present embodiment is used to illustrate polymer of the present invention and preparation method thereof.
800 grams of deionized waters are added in 2000mL beakers, 200 grams of acrylamide monomers of addition under stirring, 0.1 gram
EDTA-2Na salt, the bifunctional initiator and 0.02 gram of azo-initiator V50 of 0.1 gram of preparation example 1, logical nitrogen removes at 10 DEG C
Oxygen 30 minutes, flask is then moved into ultraviolet irradiation case and irradiated 2 hours, a length of 350nm of ultraviolet light wave, reaction temperature is 10 DEG C.
Obtained polyacrylamide blob of viscose is granulated, then by degree of hydrolysis 20%, by obtained polyacrylamide gel particles and respective amount
Sodium hydroxide grain alkali mediates contact, is hydrolyzed 0.5 hour at 90 DEG C of temperature, after secondary granulation, is dried, passes through grinding screen
Get 20-80 purpose polymers P1.P1 property is as shown in table 1.
Embodiment 2
The present embodiment is used to illustrate polymer of the present invention and preparation method thereof.
800 grams of deionized waters are added in 2000mL beakers, 200 grams of acrylamide monomers of addition under stirring, 0.1 gram
EDTA-2Na salt, the bifunctional initiator and 0.01 gram of azo-initiator VA-044 of 0.15 gram of preparation example 2, lead at 25 DEG C
Nitrogen deoxygenation 30 minutes, flask is then moved into ultraviolet irradiation case and irradiated 4 hours, a length of 320nm's of ultraviolet light wave, reaction temperature is
25℃.Obtained polyacrylamide blob of viscose is granulated, then by degree of hydrolysis 20%, by obtained polyacrylamide gel particles and accordingly
The sodium hydroxide grain alkali of amount mediates contact, is hydrolyzed 0.5 hour at 90 DEG C of temperature, after secondary granulation, is dried, passes through powder
Broken screening obtains 20-80 purpose polymers P2.P2 property is as shown in table 1.
Embodiment 3
The present embodiment is used to illustrate polymer of the present invention and preparation method thereof.
750 grams of deionized waters are added in 2000mL beakers, 250 grams of acrylamide monomers of addition under stirring, 0.05 gram
EDTA-2Na salt, the bifunctional initiator and 0.01 gram of azo-initiator VA-044 of 0.12 gram of preparation example 3, lead at 0 DEG C
Nitrogen deoxygenation 30 minutes, flask is then moved into ultraviolet irradiation case and irradiated 3 hours, a length of 380nm of ultraviolet light wave, reaction temperature 0
℃.Obtained polyacrylamide blob of viscose is granulated, then by degree of hydrolysis 20%, by obtained polyacrylamide gel particles and respective amount
Sodium hydroxide grain alkali mediate contact, hydrolyzed 0.5 hour at 90 DEG C of temperature, after secondary granulation, be dried, pass through crushing
Screening obtains 20-80 purpose polymers P3.P3 property is as shown in table 1.
Embodiment 4
The present embodiment is used to illustrate polymer of the present invention and preparation method thereof.
Polymer is prepared using method same as Example 1, except that, triggered using the azo of phase homogenous quantities
Agent 2,2 '-even base-bis- (2- amidine propanes) (ABAP) replaces the V50 in embodiment 1, so as to which polymer P 4 be made.P4 property
As shown in table 1.
Embodiment 5
The present embodiment is used to illustrate polymer of the present invention and preparation method thereof.
Polymer is prepared using method same as Example 1, except that, by azo-initiator V50 dosage
0.1 gram is brought up to, so as to which polymer P 5 be made.P5 property is as shown in table 1.
Embodiment 6
The present embodiment is used to illustrate polymer of the present invention and preparation method thereof.
Polymer is prepared using method same as Example 1, except that, by azo-initiator V50 dosage
0.006 gram is reduced to, so as to which polymer P 6 be made.P6 property is as shown in table 1.
Comparative example 1
Polymer is prepared using method same as Example 1, except that, the bifunctionality of preparation example 1 is triggered
Agent is replaced with the azo-initiator V50 of phase homogenous quantities, i.e. V50 is used only in initiator, so as to which polymer DP1 be made.DP1's
Property is as shown in table 1.
Comparative example 2
Polymer is prepared using method same as Example 1, except that, by the azo-initiator of preparation example 1
V50 is replaced with the bifunctional initiator of the preparation example 1 of phase homogenous quantities, i.e. the bifunctionality that preparation example 1 is used only in initiator is drawn
Agent is sent out, so as to which polymer DP2 be made.DP2 property is as shown in table 1.
Comparative example 3
750 grams of deionized waters are added in 2000mL beakers, 250 grams of acrylamide monomers of addition under stirring, 0.1 gram
EDTA-2Na salt.Monomer solution is transferred in polymerization bottle, letting nitrogen in and deoxidizing 30 minutes at 25 DEG C, adds 0.1 gram of bisulfite
Sodium and 0.1 gram of ammonium persulfate, continue logical nitrogen until thermocouple starts to warm up in polymerization bottle, 4 hours reaction time.Colloid is taken
Go out, be granulated.It is hydrolyzed, after secondary granulation, is dried, by crushing and screening using method same as Example 1
To 20-80 purpose polymers DP3.DP3 property is as shown in table 1.
Comparative example 4
800 grams of deionized waters are added in 2000mL beakers, 200 grams of acrylamide monomers of addition under stirring, 0.05 gram
EDTA-2Na salt.Monomer solution is transferred in polymerization bottle, adds 0.01 gram of azo-initiator V50, nitrogen is led at 25 DEG C and is removed
Oxygen 30 minutes, 0.15 gram of sodium hydrogensulfite and 0.1 gram of ammonium persulfate are added, continue logical nitrogen until thermocouple starts in polymerization bottle
Heating, 3 hours reaction time.Colloid is taken out, is granulated.It is hydrolyzed using method same as Example 1, through secondary granulation
Afterwards, it is dried, by crushing and screening to obtain 20-80 purpose polymers DP4.DP4 property is as shown in table 1.
Table 1
Understand that compared with comparative example 1-4, embodiment 1-6 polymer has higher viscous equal molecule with reference to the data of table 1
Amount, apparent viscosity and apparent viscosity retention rate.Illustrate to trigger acrylamide jointly by bifunctional initiator and azo-initiator
Obtained polymer of the invention is used with molecular weight and the characteristics of high stability as oil displacement agent.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (13)
1. a kind of polymer, the polymer is prepared by the following method：
In the presence of solvent, in the presence of initiator, the monomer containing acrylamide is subjected to polymerisation, it is characterised in that
The initiator contains the first initiator and the second initiator, and first initiator is azo-initiator, and described second draws
Send out shown in agent such as formula (1)：
Wherein, R1And R2It is each independently C1-C5Straight or branched alkyl, R3For H or C1-C5Straight or branched alkyl, two
Individual R1, two R2, two R3It is identical or different respectively；N is 2-6 integer.
2. polymer according to claim 1, wherein, shown in second initiator such as formula (2)：
3. polymer according to claim 1 or 2, wherein, R1And R2It is methyl, R3For H.
4. polymer according to claim 1, wherein, the polymerisation is carried out under the conditions of ultraviolet radiation, described
Solvent is water.
5. polymer according to claim 4, wherein, the wavelength of the ultraviolet light of the ultraviolet radiation is 300-400nm,
The time of the polymerisation is 1-5 hours.
6. polymer according to claim 1 or 2, wherein, first initiator and second initiator amount
Mass ratio is 1：1-20.
7. polymer according to claim 6, wherein, the quality of first initiator and second initiator amount
Than for 1：3-15.
8. polymer according to claim 1, wherein, the initiator and the monomer dosage containing acrylamide
Mass ratio is 1：100-1.0×105。
9. polymer according to claim 1, wherein, first initiator be azo-bis-isobutyrate hydrochloride and/or
The isobutyl imidazoline hydrochloride of azo two.
10. polymer according to claim 1, wherein, methods described also includes, poly- third that the polymerisation is obtained
Acrylamide is hydrolyzed and dried.
11. polymer according to claim 10, wherein, the condition of the hydrolysis includes：Temperature is 50-110 DEG C；Time
For 0.5-4 hours；And the condition of the hydrolysis make it that the degree of hydrolysis of the polyacrylamide is 10-30%.
12. polymer according to claim 11, wherein, the condition of the hydrolysis includes：Temperature is 70-90 DEG C；Time
For 1-2 hours.
13. application of the polymer as oil displacement agent in claim 1-12 described in any one.
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