CN103539946B - Hydrophobic polymer graft modification acrylamide polymer and preparation method thereof - Google Patents
Hydrophobic polymer graft modification acrylamide polymer and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of hydrophobic polymer graft modification acrylamide polymer and preparation method thereof, mainly solves general acrylamide polymer in prior art and there is temperature-resistant anti-salt ageing-resistant performance and the problem of Flooding Efficiency difference. The present invention is by adopting a kind of hydrophobic polymer graft modification acrylamide polymer, and chemical general formula is: P-<i>g</i>-X, wherein, P is polyacrylamide or acrylamide based copolymer, X is molecular chain structure is the hydrophobic polymer of homopolymerization type, random copolymerization type or block copolymerization type, the technical scheme of the viscosity-average molecular weight of this graft compound>=17,000,000 and preparation method thereof, solve this problem preferably, can be used in commercial production and oil reservoir oil displacement.
Description
Technical field
The present invention relates to tertiary oil recovery field, be specifically related to a kind of hydrophobic polymer graft modification acrylamide polymer and preparation method thereof.
Background technology
The universal performance of exploitation of oil-gas field water-soluble polymer requires mainly have: water solublity, tackifying, suspension, shear thinning behavior and thixotropy, stability and seepage characteristic meet the requirement etc. of oil-gas mining engineering. Although anaerobic, without divalent ion environment in super high molecular weight polyacrylamide under higher temperature, still can improve tar productivity (such as 120 DEG C), but water-soluble polymer conventional at present tertiary oil recovery for the displacement of reservoir oil time there is also many problems. As when temperature is higher, hydrolysis of polyacrylamide is serious; Formation temperature more than 75 DEG C after, along with formation temperature raise, super high molecular weight polyacrylamide precipitation formed accelerate; High temperature and high salt is easily caused super high molecular weight polyacrylamide and is precipitated out from aqueous solution, and the more high this phenomenon of degree of hydrolysis is more notable; Solution viscosity is very sensitive to temperature and salinity, and in high temperature and high salt environment, the reservation viscosity of solution is very low. Therefore, displacement of reservoir oil acrylic amide macromole has been carried out substantial amounts of research so that special reservoir condition when it meets field use by domestic and international researcher. Although appropriate heatproof, anti-salt monomer are carried out combined polymerization with acrylamide, the temperature-resistant anti-salt performance of polymer can be improved to a certain extent, but still current high or ultra-high water-containing, high salinity reservoirs requirement cannot be met.
Graft copolymer shows good rheological property and stability due to its bigger molecular chain structure. patent CN102051165A discloses method for making and the application of a kind of xanthan gum graft copolymer as oil displacement agent, adopt graft copolymerization method to be introduced on xanthan gum macromolecular chain by heat-resistance type function monomer, improve viscoelasticity and the biological stability of biomacromolecule. document (B �� y �� kya c A, TuzcuG, ArasL.Synthesisofcopolymersofmethoxypolyethyleneglycolac rylateand2-acrylamido-2-methyl-1-propanesulfonicacid:Its characterizationandapplicationassuperplasticizerinconcre te.CementandConcreteResearch, 2009, 39 (7): 629-635.) synthesis and the application of the polyacrylamide graft copolymer as high molecular surfactant are then reported, the polymeric monomer adopted is the polyoxyethylene ether esters of acrylic acid of facile hydrolysis under acid or alkali condition mainly. also has researcher according to Polymer supported catalyst principle, lengthen the side base of novel monomeric, obtain the comb shaped antisalt polymer that the hydraulic radius curling increasingly difficult, strand rotation of strand is bigger, and obtain, in tertiary oil production in oil field and deep profile correction are applied, the effect increasing oil, cost declining and protection environment preferably. and the molecular weight distribution of the above-mentioned polymer side chain being grafted on macromolecular chain is all wider, branch lengths differs and uncontrollable, and this is further Study Polymer Melts grafted chain length and the temperature-resistant anti-salt ageing resistace and tertiary oil recovery displacement research etc. of graft copolymer are brought difficulty by molecular weight equimolecular structural agent.
Summary of the invention
One of the technical problem to be solved be in prior art general acrylamide polymer when adopting in field for three, there is temperature-resistant anti-salt ageing-resistant performance and the problem of Flooding Efficiency difference, it is provided that a kind of new hydrophobic polymer graft modification acrylamide polymer. This hydrophobic polymer graft modification acrylamide polymer has the advantage that temperature-resistant anti-salt ageing-resistant performance is good and Flooding Efficiency is high. The two of the technical problem to be solved are to provide the preparation method that hydrophobic polymer graft modification acrylamide polymer that is a kind of and that solve one of technical problem is corresponding.
For solving one of above-mentioned technical problem, the technical solution used in the present invention is as follows: a kind of hydrophobic polymer graft modification acrylamide polymer, has following chemical general formula:
P-g-X
Wherein, P is polyacrylamide or acrylamide based copolymer;
X is molecular chain structure is the hydrophobic polymer of homopolymerization type, random copolymerization type or block copolymerization type;
Viscosity-average molecular weight >=17,000,000 of this hydrophobic polymer graft modification acrylamide polymer.
In technique scheme, X adopts nitrogen oxides to telomerize the hydrophobic polymer that the prepared activity of free radical polymerisation process is controlled. The monomeric repeating unit number in X any integer in 1��200.
For solving the two of above-mentioned technical problem, the technical solution used in the present invention is as follows: the preparation method of a kind of hydrophobic polymer graft modification acrylamide polymer, comprises the following steps:
A) with hydrophobic monomer for raw material, with functionalized 3-(1-phenyl ethoxy)-3-azahexane derivative for telogen, when mol ratio at telogen, radical initiator and hydrophobic monomer is 1:0.1��10:1��500, reaction temperature 30��130 DEG C, 2��20 hours response time, cause hydrophobic monomer to telomerize radical polymerization, obtain the hydrophobic polymer X that strand is homopolymerization type, random copolymerization type or block copolymerization type structure;
B) being mixed with acrylamide polymer by above-mentioned gained hydrophobic polymer, under medium and backflow effect, graft copolymerization occurs, obtain the graft modification acrylamide polymer P-g-X that side chain is hydrophobic type, wherein, g represents that product is graft type.
In technique scheme, functionalized 3-(1-phenyl ethoxy)-3-azahexane derivative preferred version described in step a) is selected from 1-function base-2, 2, 4, 4-tetramethyl-3-(1-phenyl ethoxy)-3-aza-pentane, 1-function base-2, 5-dimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 1-function base-2, 2, 5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 1-function base-2, 5, 5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane or 1-function base-2, 2, 5, at least one in 5-tetramethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane. the functional group preferred version of functionalized 3-(1-phenyl ethoxy)-3-azahexane derivative one in hydroxyl, alkoxyl, halogen, alkoxy carbonyl, carboxyl, aldehyde radical or amido. the radical initiator preferred version described in step a) at least one in azo-initiator or organic peroxide evocating agent, described azo-initiator preferred version at least one in azodiisobutyronitrile, AMBN, 2,2'-Azobis(2,4-dimethylvaleronitrile), described organic peroxide evocating agent preferred version at least one in hydrogen peroxide, isopropyl benzene hydroperoxide, cumyl peroxide, benzoyl peroxide, the peroxidating 2 ethyl hexanoic acid tert-butyl ester, the peroxidating pivalic acid tert-butyl ester, peroxy dicarbonate diisobutyl ester or 1,1-di-t-butyl peroxy hexamethylene. hydrophobic monomer preferred version described in step a) is selected from N tert butyl acrylamide, N-n-butyl acryloyloxy ethyl amide, N-n-hexyl acrylamide, N-n-octyl acrylamide, N-dodecyl acrylamide, N-n-hexadecyl acrylamide, N phenyl acrylamide, N, N-DMAA, N, at least one in N-dibutyl acrylamide, N, N-dioctyl acrylamide, butyl acrylate, butyl methacrylate, styrene, 4-t-butyl styrene, 4-Vinyl phenol, NEM or N-phenylmaleimide. by weight percentage, the ratio of the hydrophobic polymer described in step b), acrylamide polymer and medium preferably ranges from: 0.01��5.0:0.01��5.0:90.0��99.98, more preferably ranges for 0.1��3.5:0.1��3.5:93.0��99.8. described medium preferably ranges from least one in the aqueous solution of the sodium hydroxide of 7.2��13.8, potassium hydroxide, sodium bicarbonate, potassium bicarbonate, sodium carbonate or potassium carbonate selected from pH value.
The inventive method it is critical only that with the addition of the appropriate nitrogen oxides with functional group makes telogen, prepares the hydrophobic associated polymer that Series Molecules chain is controlled, regrafts on the macromolecular chain of acrylamide polymer.
Functionalized 3-(1-the phenyl ethoxy)-3-azahexane derivative adopted in the present invention is reference literature (BenoitD, ChaplinskiV, BraslauR, HawkerCJ.Developmentofauniversalalkoxyaminefor " living " freeradicalpolymerizations.JournaloftheAmericanChemicalS ociety, 1999, 121:3904-3920.) in method, by to 5mL1-trimethylsiloxy group-2, 2, the methanol solution of 5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane (0.241mol) adds 50mg citric acid, in room temperature, after the lower reaction of stirring 5 minutes, solution is after vacuum filtration, with hexane/ethyl acetate mixed solvent (volume ratio 30:1), thick product eluting is carried out rapid column chromatography, the 1-hydroxyl-2 of the colorless oil obtained, 2, 5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane.
The inventive method is telogen by introducing functionalized 3-(1-phenyl ethoxy)-3-azahexane derivative, in the hydrophobic polymer that gained chain is controlled, the length of micro-block can be arbitrarily devised, molecular structure reaches controlled, adopt the hydrophobic polymer graft modification acrylamide polymer in the present invention, can significantly further improving the temperature-resistant anti-salt of acrylamide polymer, ageing resistace and Flooding Efficiency, under 85 DEG C of oxygen free conditions, viscosity retention ratio when aging 3 months is up to 93.4%. The existence of hydrophobic type grafted chain increases the space structure of acrylamide polymer, and give its special three-dimensional space network structure, also being not susceptible to curling under shear action, displacement efficiency can further improve oil recovery factor on water drive basis and reaches 10.8%, yields good result.
The invention will be further elaborated by the examples below.
Detailed description of the invention
[embodiment 1]
0.10mol1-hydroxyl-2 is injected in dry reaction bottle, 2,5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 0.12mol cumyl peroxide and 0.8molN, N-DMAA, after reacting 6 hours at 87 DEG C, add isopropanol and terminate reaction, after ether sedimentation, the molecular weight obtained is the poly-N,N-DMAA homopolymer of hydrophobic association type of 770. It is the polyacrylamide of 28,500,000 by resulting polymers 0.08g and 2.2g viscosity-average molecular weight, under strong stirring effect, it is scattered in 97g wet chemical (pH=8.0), under backflow effect, there is graft copolymerization, obtain the poly-N,N-DMAA of graft-modified polymers polyacrylamide-g-.
Following method or standard testing gained is adopted to dredge structure and the performance of polymer graft modification polyacrylamide: to measure (viscosimetry) by GB/T12005.10-92 Molecular Weight for Polyacrylamide and measure the intrinsic viscosity of polymer, and by [��]=3.73 �� 10-4Mw 0.66Calculate relative molecular mass; Brookfield company of the U.S. is adopted to produce the polymer salt aqueous solution (total salinity 32868mg/L, calcium ions and magnesium ions concentration 874mg/L) of BROOKFIELD III type viscometer test 1500mg/L concentration at 85 DEG C, 7.34s-1Under apparent viscosity; The polymer salt aqueous solution of 1500mg/L concentration thermal stability when aging 3 months under 85 DEG C of oxygen free conditions is tested by Q/SH1020; Displacement test: (length is 30 centimetres, and diameter is 2.5 centimetres, and permeability is 1.5 microns by rock core with the injection water of salinity 32868mg/L, calcium ions and magnesium ions concentration 874mg/L2) saturated, the pore volume (PV) measuring rock core is 48.8%, then carry out saturated with Shengli Oil Field block dewatered oil, oil displacement test it is simulated: first water drive is to moisture 92% under 85 DEG C of constant temperature, record water drive and improve oil recovery factor 30.8%, again after the hydrophobic polymer graft modification acrylamide polymer synthesized by tuberculosis 0.15PV (rock pore volume), water drive, to moisture 99.0%, records the recovery ratio that can improve crude oil on water drive basis again.
The result of above-mentioned analysis is as shown in table 1.
[embodiment 2]
0.13mol1-chloro-2 is injected in dry reaction bottle, 5-dimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 0.15mol benzoyl peroxide and 0.25molN-dodecyl acrylamide, after reacting 7 hours at 75 DEG C, add isopropanol and terminate reaction, after ether sedimentation, obtain the poly-N-dodecyl methacrylamide homopolymer of hydrophobic association type that molecular weight is 500. By gained copolymer 0.06g and poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium) (degree of hydrolysis 18.2%) that 1.98g viscosity-average molecular weight is 26,700,000, under strong stirring effect, it is scattered in 98g potassium bicarbonate aqueous solution (pH=10.0), under backflow effect, there is graft copolymerization, obtain the graft-modified polymers poly-N-dodecyl acrylamide of poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium)-g-.
The structure of the method described in embodiment 1 of employing or standard testing gained hydrophobic polymer graft modification acrylamide polymer and performance, analyze result as shown in table 1.
[embodiment 3]
0.11mol1-amido-2 is injected in dry reaction bottle, 5,5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 0.125mol isopropyl benzene hydroperoxide, 0.2molN-N-tert-butyl acrylamide and 0.1molN-Phenyl Acrylamide, after reacting 7 hours at 92 DEG C, add isopropanol and terminate reaction, after ether sedimentation, obtain poly-(N tert butyl acrylamide-r-N-Phenyl Acrylamide) random copolymer of hydrophobic association type that molecular weight is 350. It is the super high molecular weight polyacrylamide of 17,200,000 by gained copolymer 0.05g and 1.7g viscosity-average molecular weight, under strong stirring effect, it is scattered in 99g potassium hydroxide aqueous solution (pH=9.8), under backflow effect, there is graft copolymerization, obtain graft-modified polymers polyacrylamide-g-poly-(N tert butyl acrylamide-r-N-Phenyl Acrylamide).
The structure of the method described in embodiment 1 of employing or standard testing gained hydrophobic polymer graft modification polypropylene amide and performance, analyze result as shown in table 1.
[embodiment 4]
0.16mol1-carboxyl-2 is injected in dry reaction bottle, 2,4,4-tetramethyl-3-(1-phenyl ethoxy)-3-aza-pentane, 0.18mol azodiisobutyronitrile, 0.5mol butyl methacrylate, after reacting 5 hours at 66 DEG C, add 0.2mol4-t-butyl styrene, reaction 4 hours is continued at 89 DEG C, add isopropanol and terminate reaction, after ether sedimentation, obtain poly-(butyl methacrylate-b-4-t-butyl styrene) block copolymer of hydrophobic association type that molecular weight is 500. By gained copolymer 0.09g and poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium) (degree of hydrolysis 16.9%) that 0.9g viscosity-average molecular weight is 20,600,000, under strong stirring effect, it is scattered in 99g sodium hydrate aqueous solution (pH=10.9), under backflow effect, there is graft copolymerization, obtain poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid the sodium)-g-of graft-modified polymers poly-(butyl methacrylate-b-4-t-butyl styrene).
The structure of the method described in embodiment 1 of employing or standard testing gained hydrophobic polymer graft modification acrylamide polymer and performance, analyze result as shown in table 1.
[embodiment 5]
0.17mol1-aldehyde radical-2 is injected in dry reaction bottle, 2, 5, 5-tetramethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 0.19mol benzoyl peroxide, 0.3molN-N-tert-butyl acrylamide and 0.1molN, N-dioctyl acrylamide, after reacting 6 hours at 78 DEG C, add 0.2mol styrene, reaction 4 hours is continued at 89 DEG C, add isopropanol and terminate reaction, after ether sedimentation, obtain the poly-(N tert butyl acrylamide-r-N of hydrophobic association type that molecular weight is 500, N-dioctyl acrylamide)-b-polystyrene block copolymer. by gained copolymer 0.04g and poly-(acrylamide-b-2-acrylamide-2-methylpro panesulfonic acid sodium) (degree of hydrolysis 22.5%) that 1.4g viscosity-average molecular weight is 23,200,000, under strong stirring effect, it is scattered in 98g aqueous sodium carbonate (pH=11.2), under backflow effect, there is graft copolymerization, obtain poly-(acrylamide-b-2-acrylamide-2-methylpro panesulfonic acid sodium)-g-of graft-modified polymers (poly-(N tert butyl acrylamide-r-N, N-dioctyl acrylamide)-b-polystyrene).
The structure of the method described in embodiment 1 of employing or standard testing gained hydrophobic polymer graft modification acrylamide polymer and performance, analyze result as shown in table 1.
[embodiment 6]
0.13mol1-bromo-2 is injected in dry reaction bottle, 2,5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, the 0.14mol peroxidating pivalic acid tert-butyl ester and 0.3molN-n-hexyl acrylamide, after reacting 6 hours at 100 DEG C, reinject 0.2mol styrene and 0.2mol4-hydroxy styrenes, after continuing reaction at 103 DEG C 5 hours, add isopropanol and terminate reaction, after ether sedimentation, obtain hydrophobic association type poly-(styrene-r-4-hydroxy styrenes) block copolymer of poly-N-n-hexyl acrylamide-b-that molecular weight is 660. By gained copolymer 0.08g and poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium) (degree of hydrolysis 24.8%) that 1.8g viscosity-average molecular weight is 25,000,000, under strong stirring effect, it is scattered in 97g sodium bicarbonate aqueous solution (pH=7.5), under backflow effect, there is graft copolymerization, obtain poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium)-g-of graft-modified polymers (poly-N-n-hexyl acrylamide-b-poly-(styrene-r-4-hydroxy styrenes)).
The structure of the method described in embodiment 1 of employing or standard testing gained hydrophobic polymer graft modification acrylamide polymer and performance, analyze result as shown in table 1.
[comparative example 1]
With [embodiment 2], simply graft copolymerization is not carried out, only poly-N-dodecyl methacrylamide homopolymer hydrophobic for gained is mixed with poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium) (degree of hydrolysis 18.2%), the method described in embodiment 1 of employing or the temperature-resistant anti-salt of standard testing gained mixture, ageing-resistant performance and imitation oil displacement experiment test, analyze result as shown in table 1.
[comparative example 2]
Controllable free-radical polymerisation and graft copolymerization are not carried out, only the performance of poly-(acrylamide-r-2-acrylamide-2-methylpro panesulfonic acid sodium) (degree of hydrolysis 24.8%) used in [embodiment 6] is analyzed, the method described in embodiment 1 of employing or its temperature-resistant anti-salt of standard testing, ageing-resistant performance and imitation oil displacement experiment test, analyze result as shown in table 1.
The structure of table 1 polymer and performance
Claims (8)
1. a hydrophobic polymer graft modification acrylamide polymer, has following chemical general formula:
P-g-X
Wherein, P is polyacrylamide or acrylamide based copolymer;
X is molecular chain structure is the hydrophobic polymer of homopolymerization type, random copolymerization type or block copolymerization type;
Viscosity-average molecular weight >=17,000,000 of this hydrophobic polymer graft modification acrylamide polymer; The monomeric repeating unit number in X any integer in 1��200; Hydrophobic monomer in X is selected from N tert butyl acrylamide, N-n-butyl acryloyloxy ethyl amide, N-n-hexyl acrylamide, N-n-octyl acrylamide, N-dodecyl acrylamide, N-n-hexadecyl acrylamide, N phenyl acrylamide, N, N-DMAA, N, at least one in N-dibutyl acrylamide, N, N-dioctyl acrylamide, butyl acrylate, butyl methacrylate, styrene, 4-t-butyl styrene, 4-Vinyl phenol, NEM or N-phenylmaleimide; By weight percentage, the ratio range of described X, P is: 0.01��5.0:0.01��5.0.
2. the hydrophobic polymer graft modification acrylamide polymer described in claim 1, it is characterised in that X adopts nitrogen oxides to telomerize the hydrophobic polymer that the prepared activity of free radical polymerisation process is controlled.
3. the preparation method of the hydrophobic polymer graft modification acrylamide polymer described in claim 1, comprises the following steps:
A) with hydrophobic monomer for raw material, with functionalized 3-(1-phenyl ethoxy)-3-azahexane derivative for telogen, when mol ratio at telogen, radical initiator and hydrophobic monomer is 1:0.1��10:1��500, reaction temperature 30��130 DEG C, 2��20 hours response time, cause hydrophobic monomer to telomerize radical polymerization, obtain the hydrophobic polymer X that strand is homopolymerization type, random copolymerization type or block copolymerization type structure;
B) being mixed with acrylamide polymer by above-mentioned gained hydrophobic polymer, under medium and backflow effect, graft copolymerization occurs, obtain the graft modification acrylamide polymer P-g-X that side chain is hydrophobic type, wherein, g represents that product is graft type;
Wherein, hydrophobic monomer described in step a) is selected from N tert butyl acrylamide, N-n-butyl acryloyloxy ethyl amide, N-n-hexyl acrylamide, N-n-octyl acrylamide, N-dodecyl acrylamide, N-n-hexadecyl acrylamide, N phenyl acrylamide, N, N-DMAA, N, at least one in N-dibutyl acrylamide, N, N-dioctyl acrylamide, butyl acrylate, butyl methacrylate, styrene, 4-t-butyl styrene, 4-Vinyl phenol, NEM or N-phenylmaleimide; By weight percentage, the hydrophobic polymer described in step b), acrylamide polymer ratio range be: 0.01��5.0:0.01��5.0.
4. the preparation method of hydrophobic polymer graft modification acrylamide polymer according to claim 3, it is characterized in that functionalized 3-(1-the phenyl ethoxy)-3-azahexane derivative described in step a) is selected from 1-function base-2, 2, 4, 4-tetramethyl-3-(1-phenyl ethoxy)-3-aza-pentane, 1-function base-2, 5-dimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 1-function base-2, 2, 5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane, 1-function base-2, 5, 5-trimethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane or 1-function base-2, 2, 5, at least one in 5-tetramethyl-3-(1-phenyl ethoxy)-4-phenyl-3-aza-hexane.
5. the preparation method of hydrophobic polymer graft modification acrylamide polymer according to claim 3, it is characterised in that the functional group of functionalized 3-(1-phenyl ethoxy)-3-azahexane derivative one in hydroxyl, alkoxyl, halogen, alkoxy carbonyl, carboxyl, aldehyde radical or amido.
6. the preparation method of hydrophobic polymer graft modification acrylamide polymer according to claim 3, it is characterised in that at least one in azo-initiator or organic peroxide evocating agent of the radical initiator described in step a); Described azo-initiator at least one in azodiisobutyronitrile, AMBN, 2,2'-Azobis(2,4-dimethylvaleronitrile); Described organic peroxide evocating agent at least one in hydrogen peroxide, isopropyl benzene hydroperoxide, cumyl peroxide, benzoyl peroxide, the peroxidating 2 ethyl hexanoic acid tert-butyl ester, the peroxidating pivalic acid tert-butyl ester, peroxy dicarbonate diisobutyl ester or 1,1-di-t-butyl peroxy hexamethylene.
7. the preparation method of hydrophobic polymer graft modification acrylamide polymer according to claim 3, it is characterized in that by weight percentage, the ratio range of the hydrophobic polymer described in step b), acrylamide polymer and medium is: 0.01��5.0:0.01��5.0:90.0��99.98.
8. the preparation method of hydrophobic polymer graft modification acrylamide polymer according to claim 3, it is characterised in that described medium at least one in the aqueous solution of the sodium hydroxide that pH value range is 7.2��13.8, potassium hydroxide, sodium bicarbonate, potassium bicarbonate, sodium carbonate or potassium carbonate.
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| CN105273129A (en) * | 2015-11-06 | 2016-01-27 | 东营市诺尔化工有限责任公司 | Preparation method of anionic polyacrylamide with ultrahigh viscosity |
| CN108431170A (en) * | 2016-01-13 | 2018-08-21 | 巴斯夫欧洲公司 | By Hydrophobic association property polymer tertiary recovery mineral oil method |
| CN107629771B (en) * | 2017-09-29 | 2020-08-11 | 中国石油天然气集团公司 | Preparation method of low-viscosity high-shear oil well cement suspension stabilizer for large-temperature-difference well cementation |
| CN107746447B (en) * | 2017-10-25 | 2020-04-07 | 中国石油化工股份有限公司 | Delayed tackifying polymer for profile control and preparation method thereof |
| CN111286315A (en) * | 2020-03-26 | 2020-06-16 | 东野升富 | Compound oil-displacing agent for increasing recovery ratio of low-permeability reservoir and preparation method thereof |
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