CN104231132B - Multifunctional oil-displacing polymer and preparation method thereof - Google Patents
Multifunctional oil-displacing polymer and preparation method thereof Download PDFInfo
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- 229920000642 polymer Polymers 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 21
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- IKZUTTBMFIUNNV-UHFFFAOYSA-N formaldehyde N-methylmethanamine Chemical compound C=O.CNC IKZUTTBMFIUNNV-UHFFFAOYSA-N 0.000 claims abstract description 10
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims abstract description 9
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims abstract description 9
- 239000003513 alkali Substances 0.000 claims abstract description 8
- JZMJDSHXVKJFKW-UHFFFAOYSA-M methyl sulfate(1-) Chemical compound COS([O-])(=O)=O JZMJDSHXVKJFKW-UHFFFAOYSA-M 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 10
- 230000035484 reaction time Effects 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 229940079827 sodium hydrogen sulfite Drugs 0.000 claims description 8
- 238000006392 deoxygenation reaction Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims 1
- 239000010779 crude oil Substances 0.000 abstract description 8
- 230000001804 emulsifying effect Effects 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract 1
- 239000008098 formaldehyde solution Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 19
- 239000011435 rock Substances 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 9
- 239000002585 base Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- 150000001408 amides Chemical class 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 2
- 229910001863 barium hydroxide Inorganic materials 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000006683 Mannich reaction Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011206 ternary composite Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009777 vacuum freeze-drying Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a multifunctional oil-displacing polymer and a preparation method thereof; adding 300 parts of water and 20 parts of polyacrylamide; then adding a formaldehyde-dimethylamine solution prepared by mixing 16 parts of formaldehyde and 20 parts of dimethylamine into a reaction kettle in a vacuumizing and deoxidizing state, controlling the reaction temperature to be 25-35 ℃, and reacting for 100-120 minutes at constant temperature; then adding 10 parts of formaldehyde solution and 18 parts of sodium bisulfite, adjusting the pH value to 11.0-13.0 by using alkali solution, and quickly heating to 65-85 ℃ for constant-temperature reaction for 80-90 minutes; cooling to normal temperature, adding 16 parts of methyl sulfate, and reacting for 40-60 minutes to obtain the polymer; the oil-displacing polymer prepared by the method has strong tackifying and emulsifying capabilities and higher crude oil recovery capability.
Description
Technical field
It is specifically a kind of on polyacrylamide molecular skeleton the present invention relates to a kind of flooding polymers, introduce successively
A kind of multi-functional flooding polymers of sulphur methyl, carboxyl and quaternary ammonium salt functional structure unit and preparation method thereof.
Background technology
At present, the method for the conventional tertiary oil recovery in oil field mainly has polymer flooding, ternary composite driving, binary combination flooding etc..
The polymer that polymer displacement of reservoir oil tech uses is mainly partially hydrolyzed polyacrylamide (PHPA), and it injects the viscosity of fluid by increasing,
The mobility ratio of water oil is reduced, reduces the fingering of water, expands sweep efficiency, while polymer has viscoplasticity, can improve the displacement of reservoir oil
Efficiency, so as to improve the recovery ratio of oil reservoir, but the interfacial tension between polymer and crude oil is very high, to crude oil without solubilising and
Emulsifying capacity, thus the degree of technology raising oil recovery factor is restricted, typically only 10%-15%.Poly-/table/alkali ternary
Combination flooding is realized while injected fluid viscosity is kept and reaches ultralow interfacial tension between profit, oil recovery factor can be in water
More than 20% is improved on the basis of drive.But due to the addition of highly basic in ternary system, scattered, the transfer of stratum clay can be caused, led
In-place permeability is caused to decline, alkali reacts with reservoir fluid and rock forming mineral, can form alkali dirt, damage, can cause to stratum
The fouling of oil well, ground Produced Liquid processing instrumentation and pipeline etc., has a strong impact on normal production.Poly-/table binary combination flooding
The synergy of polymer and surfactant has been given full play to improve the method for recovery ratio, has played polymer to greatest extent
Viscoplasticity, oil water interfacial tension is reduced, reduce the negative effect that emulsion processing is brought, weaken due to the presence of alkali in ternary
Cause the scale formation of stratum and well.The production cost that multiple elements design drives chemical agent is all higher, additionally, due to different chemical agents
The performance characteristics such as absorption, diffusion and migration of the mixture in reservoir of porous medium differ greatly, and also result in reservoir pore
" chromatogram effect " during the middle displacement of reservoir oil.Based on above reason, it would be desirable to both a kind of comprehensive polymer and surfactant it is excellent
Gesture, under conditions of without alkali, thickening, mobility ratio is reduced, expand sweep efficiency, improve to the solubilising and emulsifying capacity of crude oil
Gathered etc. advantage, realize more economical, environmentally friendly high efficiency unitary chemical displacement of reservoir oil product.
The content of the invention
The purpose of the present invention is to overcome problems of the prior art, there is provided a kind of multi-functional flooding polymers and its
Preparation method, this kind of multi-functional flooding polymers, polymer and the advantage both surfactant are combined, in the bar without alkali
Under part, thickening, reduction mobility ratio, expansion sweep efficiency, raising are rolled into one to advantages such as the solubilising of crude oil and emulsifying capacities.
Technical scheme is used by realize the object of the invention：A kind of multi-functional flooding polymers are designed, it is characterized in that：
It is using polyacrylamide as initial feed, contains sulphur first by amine-methylated, sulfomethylation, partial amides base hydrolysis
The Polymer Used For Oil Displacement of base, carboxyl and quaternary ammonium salt functional structure unit.
Described Polymer Used For Oil Displacement is made up of following raw material by following weight proportions：
Polyacrylamide is 20 parts, water is 320 parts, formaldehyde is 26 parts, dimethylamine is 20 parts, sodium hydrogensulfite is 18 parts,
Alkali metal hydroxide is 5 parts, Methylsulfate is 16 parts.
A kind of preparation method of described multi-functional flooding polymers is：
1）It is 20 parts to take polyacrylamide, water is 320 parts, formaldehyde is 26 parts, dimethylamine is 20 parts, sodium hydrogensulfite 18
Part, alkali metal hydroxide are 5 parts, Methylsulfate is 16 parts, standby；
2）The stirring slurry of reactor is first started, the polyacrylamide solution that concentration is 6% is added, wherein the concentration is
6% polyacrylamide solution reclaimed water is 300 parts, polyacrylamide is 20 parts；Then by thing in the state of deoxygenation is vacuumized
The formaldehyde-dimethylamine solution for first mixing and reacting generation is added in reactor, wherein the formaldehyde-dimethylamine solution is by 16
Part formaldehyde and 20 parts of dimethylamine mixed preparings, controlling reaction temperature are 25~35 DEG C, 100~120 minutes isothermal reaction time；The
After single step reaction terminates, the formalin and 18 parts of sodium hydrogensulfite of 10 parts of input, pH is adjusted with the aqueous slkali that concentration is 20%
Value is uniformly brought rapidly up to 65~85 DEG C of progress second step reactions, wherein the concentration is 20% aqueous slkali to 11.0~13.0
Middle 5 parts of alkali metal hydroxide, 20 parts of water；80~90 minutes isothermal reaction time, normal temperature is then cooled to, adds 16 parts of sulphur
Sour methyl esters reacts 40~60 minutes, the final polymer for obtaining this product.
The alkali metal hydroxide is the one of which in sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide.
The beneficial effects of the invention are as follows：Due to the present invention flooding polymers in formaldehyde be proportionally added at twice without
It is once the excessive stabilization and second step sulfomethylation, partial amides base for adding, being advantageous to first step Mannich reaction product
The reasonable control of hydrolysis degree.There is the flooding polymers of the present invention very strong thickening, emulsifying capacity and higher crude oil to adopt
Receipts ability.
Embodiment
Embodiment 1
1）To take polyacrylamide be 20Kg, water 320Kg, formaldehyde 26Kg, dimethylamine 20Kg, sodium hydrogensulfite are
18Kg, alkali metal hydroxide 5Kg, Methylsulfate 16Kg, it is standby；Described alkali metal hydroxide is sodium hydroxide.
2）The stirring slurry of reactor is first started, the polyacrylamide solution that concentration is 6% is added, wherein the concentration is
6% polyacrylamide solution reclaimed water is 300Kg, polyacrylamide 20Kg；Then by thing in the state of deoxygenation is vacuumized
The formaldehyde-dimethylamine solution for first mixing and reacting generation is added in reactor, wherein the formaldehyde-dimethylamine solution be by
16Kg formaldehyde and 20Kg dimethylamine mixed preparings, controlling reaction temperature are 35 DEG C, 100 minutes isothermal reaction time；The first step is anti-
After should terminating, put into 10Kg parts formalin and 18Kg sodium hydrogensulfite, with concentration be 20% aqueous slkali adjust pH value to
13.0, uniformly it is brought rapidly up to 70 DEG C of progress second step reactions, wherein sodium hydroxide 5Kg in the aqueous slkali that the concentration is 20%,
Water 20Kg；90 minutes isothermal reaction time, normal temperature is then cooled to, the Methylsulfate for adding 16Kg reacts 40 minutes, finally obtains
Obtain the polymer of this product.
Embodiment 2
The stirring slurry of reactor is first started, adds the polyacrylamide solution that concentration is 6%, wherein the concentration is 6%
Polyacrylamide solution reclaimed water be 300Kg, polyacrylamide 20Kg；Then will be prior in the state of deoxygenation is vacuumized
The formaldehyde-dimethylamine solution for mixing and reacting generation is added in reactor, wherein the formaldehyde-dimethylamine solution is by 16Kg
Formaldehyde and 20Kg dimethylamine mixed preparings, controlling reaction temperature are 25 DEG C, 110 minutes isothermal reaction time；First step reaction knot
Shu Hou, put into 10Kg parts formalin and 18Kg sodium hydrogensulfite, with concentration be 20% aqueous slkali adjust pH value to
12.0, uniformly it is brought rapidly up to 85 DEG C of progress second step reactions, wherein potassium hydroxide 5Kg in the aqueous slkali that the concentration is 20%,
Water 20Kg；85 minutes isothermal reaction time, normal temperature is then cooled to, the Methylsulfate for adding 16Kg reacts 50 minutes, finally obtains
Obtain the polymer of this product.
Embodiment 3
The stirring slurry of reactor is first started, adds the polyacrylamide solution that concentration is 6%, wherein the concentration is 6%
Polyacrylamide solution reclaimed water be 300Kg, polyacrylamide 20Kg；Then will be prior in the state of deoxygenation is vacuumized
The formaldehyde-dimethylamine solution for mixing and reacting generation is added in reactor, wherein the formaldehyde-dimethylamine solution is by 16Kg
Formaldehyde and 20Kg dimethylamine mixed preparings, controlling reaction temperature are 30 DEG C, 120 minutes isothermal reaction time；First step reaction knot
Shu Hou, put into 10Kg parts formalin and 18Kg sodium hydrogensulfite, with concentration be 20% aqueous slkali adjust pH value to
11.0, uniformly it is brought rapidly up to 65 DEG C of progress second step reactions, wherein sodium hydroxide 5Kg in the aqueous slkali that the concentration is 20%,
Water 20Kg；80 minutes isothermal reaction time, normal temperature is then cooled to, the Methylsulfate for adding 16Kg reacts 60 minutes, finally obtains
Obtain the polymer of this product.
Embodiment 4
Embodiment 4 is essentially identical with embodiment 1, is a difference in that：Described alkali metal hydroxide is calcium hydroxide.
Embodiment 5
Embodiment 5 is essentially identical with embodiment 1, is a difference in that：Described alkali metal hydroxide is barium hydroxide.
The flooding polymers of the present invention are not limited only to the preparation method in above-described embodiment, as long as its preparation method
Using polyacrylamide as initial feed, sulphur methyl, carboxylic are contained by amine-methylated, sulfomethylation, partial amides base hydrolysis
The Polymer Used For Oil Displacement of base and quaternary ammonium salt functional structure unit.
Assay
Experimental program 1：The tackifying of multi-functional flooding polymers
Multi-functional flooding polymers made from Example 1,500mg/L multi-functional drive is respectively configured with clear water and sewage
Oil polymer and common M6000 polymer solutions.Pipetted on 2 ц L sample solutions to carriers with micro syringe, moved to rapidly
Precooling 30s on liquid nitrogen, container is then immersed into liquid nitrogen frozen 2-3min, is being transferred quickly to -30 DEG C of vacuum freeze dryings
Machine, freezing vacuumize dry 48h, take out metal spraying plated film.Sample is moved into SEM SEM, is observed multi-functional
The pattern of flooding polymers and common M6000 polymer waters molecular coil, picture is chosen, is analyzed.
Experimental result and analysis 1：
Common M6000 polymer molecules form part, the network structure of individual layer in clear water solution, and mesh is larger, and
More sparse, grid frame is thicker.In sewage solution, the uneven network structure that is formed by Van der Waals crosslinking points, mesh it
Between be not bound up well, there are many breakpoints, defect occurs in grid, and skeleton is sparse, can adsorb and wrap up hydrone
Quantity is greatly decreased, and tackifying ability is deteriorated.
Multi-functional flooding polymers are in clear water, due to the presence of function base, intramolecular, it is intermolecular interconnect, formed
Fine and close network structure, mesh unobvious.In sewage solution, multi-functional flooding polymers are intermolecular, intramolecular is coupled each other,
The space net structure of layer stereo is formed, makes every effort to minimum with the volume of waste water.Node, chain between mesh and mesh be present
Beam, chain bundle, mesh, node joint form three-dimensional space net structure.This existing supporting role of network, again absorption and
Wrap up large quantity of moisture and produce deformation resistance, increase substantially solution viscosity.
It can be drawn from above-mentioned analysis：Due to the presence of function base, multi-functional flooding polymers in the solution, intramolecular, divide
Appropriate combination between son, space multistory network structure is formed, therefore there is very strong tackifying.
Experimental program 2：The emulsifiability of multi-functional flooding polymers
（1）By multi-functional flooding polymers solution made from embodiment 1 and common M6000 polymer solutions and crude oil by not
Add in proportion in colorimetric cylinder.
（2）After solution in colorimetric cylinder is rocked into 3~5 minutes, observation is stood.
Experimental result and analysis 2：
Multi-functional flooding polymers solution rocks uniformly after being mixed with crude oil by different proportion, and no matter the multi-functional displacement of reservoir oil polymerize
Thing concentration is low concentration 600mg/L, or 1000mg/L, all without being layered at once after rocking；And common M6000 polymer solutions
With oil by fluid than 1：5 mixing, do not emulsify after rocking, after static placement, are layered at once, show that multi-functional flooding polymers have very
Good emulsifying capacity.
Experimental program 3：The resistance coefficient and residual resistance factor of multi-functional flooding polymers
Multi-functional flooding polymers made from Example 1, the multi-functional displacement of reservoir oil for being 1000mg/L with waste water concentration
Polymer solution（After shearing）, M6000 polymer concentrations are 1000mg/L（After shearing）.The basic data of the rock core of experiment is shown in
Table 1.
Table 1：Test the basic data of rock core
| Rock core number | Length（cm） | Diameter（cm） | Porosity（%） | Perm-plug method（md） |
| 1-1 | 10.63 | 2.50 | 26.31 | 566 |
| 2-1 | 10.51 | 2.50 | 24.58 | 595 |
The simulated formation water that experimentation is 4000mg/L with salinity, rock core is evacuated, saturation stratum water, determines rock core
Voidage;First, water drive is carried out with 0.3mL/min constant flow rate, the pressure difference data at both ends is imported and exported according to rock core, with up to
The water phase permeability of western law measure rock core, then again with identical speed be injected separately into multi-functional flooding polymers solution and
M6000 polymer solutions, after rock core pressure at two ends is stable, determine resistance coefficient;Finally, switch to water drive, determine residual resistive
Coefficient.
Experimental result and analysis 3：
Table 2：Resistance coefficient and residual resistance factor of the multi-functional flooding polymers in rock core
Table 3：Resistance coefficient and residual resistance factor of the M6000 polymer in rock core
Test result indicates that:Compared with the M6000 polymer solutions with concentration, the resistance of multi-functional flooding polymers solution
Coefficient and residual resistance factor will be higher by a lot, can preferably be played Polymer enlargement swept volume and be improved recovery ratio.
Meanwhile also distinguish above three experimental program using multi-functional flooding polymers made from embodiment 2-5, as a result together
Experimental result using multi-functional flooding polymers made from embodiment 1 is consistent.
Conclusion
Experimental Comparison more than passing through, it can be seen that multi-functional flooding polymers of the invention are relative and general polymer,
Multi-functional flooding polymers have very strong thickening, emulsifying capacity and higher oil recovering ability.
Claims (2)
- A kind of 1. preparation method of multi-functional flooding polymers, it is characterised in that：(1) stirring slurry of reactor is started, adds 300 parts of water, polyacrylamide is 20 parts；(2) it is the formaldehyde-dimethylamine of 16 parts of formaldehyde and 20 parts of dimethylamine mixed preparings is molten and then in the state of deoxygenation is vacuumized Liquid is added in reactor, and controlling reaction temperature is 25~35 DEG C, 100~120 minutes isothermal reaction time；(3) after first step reaction terminates, the formalin and 18 parts of sodium hydrogensulfite of 10 parts of input, with the alkali that concentration is 20% Solution adjusts pH value to 11.0~13.0, is uniformly brought rapidly up to 65~85 DEG C of progress second step reactions, wherein concentration is 20% Aqueous slkali in 5 parts of alkali metal hydroxide, 20 parts of water；80~90 minutes isothermal reaction time；(4) and then normal temperature is cooled to, adds 16 parts of Methylsulfate and react 40~60 minutes, the final polymerization for obtaining this product Thing,The alkali metal hydroxide is the one of which in sodium hydroxide, potassium hydroxide.
- A kind of 2. multi-functional flooding polymers, it is characterised in that：It is prepared as the preparation method described in claim 1.
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