CN116874661A - Polymer polyacrylamide for tertiary oil recovery and preparation method thereof - Google Patents
Polymer polyacrylamide for tertiary oil recovery and preparation method thereof Download PDFInfo
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- CN116874661A CN116874661A CN202311137918.6A CN202311137918A CN116874661A CN 116874661 A CN116874661 A CN 116874661A CN 202311137918 A CN202311137918 A CN 202311137918A CN 116874661 A CN116874661 A CN 116874661A
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- polyacrylamide
- oil recovery
- initiator
- tertiary oil
- acrylamide
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- 229920002401 polyacrylamide Polymers 0.000 title claims abstract description 65
- 229920000642 polymer Polymers 0.000 title claims abstract description 42
- 238000011084 recovery Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 239000003999 initiator Substances 0.000 claims abstract description 47
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000047 product Substances 0.000 claims abstract description 20
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims abstract description 17
- WNNNWFKQCKFSDK-UHFFFAOYSA-N allylglycine Chemical compound OC(=O)C(N)CC=C WNNNWFKQCKFSDK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000337 buffer salt Substances 0.000 claims abstract description 8
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 7
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims abstract description 6
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 125000000129 anionic group Chemical group 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 51
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000009423 ventilation Methods 0.000 claims description 36
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 235000010265 sodium sulphite Nutrition 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 11
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 11
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 7
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims description 7
- 239000005695 Ammonium acetate Substances 0.000 claims description 7
- 235000019257 ammonium acetate Nutrition 0.000 claims description 7
- 229940043376 ammonium acetate Drugs 0.000 claims description 7
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 4
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 4
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 4
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 4
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 4
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 4
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 3
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 3
- 235000019838 diammonium phosphate Nutrition 0.000 claims description 3
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 3
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 3
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 2
- 238000010008 shearing Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 239000006227 byproduct Substances 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 23
- -1 carboxyl anions Chemical class 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 8
- 239000000178 monomer Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000004094 surface-active agent Substances 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 2
- 239000011218 binary composite Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- QABCGOSYZHCPGN-UHFFFAOYSA-N chloro(dimethyl)silicon Chemical compound C[Si](C)Cl QABCGOSYZHCPGN-UHFFFAOYSA-N 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000012835 hanging drop method Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000006012 monoammonium phosphate Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000006174 pH buffer Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C08F220/56—Acrylamide; Methacrylamide
-
- 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
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
-
- 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
- C08F4/00—Polymerisation catalysts
- C08F4/40—Redox systems
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K8/584—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 surfactants
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention belongs to the technical field of tertiary oil recovery, and particularly relates to polymer polyacrylamide for tertiary oil recovery and a preparation method thereof. The preparation method comprises the following steps: introducing nitrogen into a reaction kettle, sequentially adding acrylamide, 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) methyl acrylate, allyl glycine, 1-vinyl-2-pyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid, an emulsifier, buffer salt and deionized water, stirring at a high speed, uniformly stirring, and adjusting the pH value; adding an initiator into a high-level dripping tank, automatically heating the solution in the dripping process, heating to 75-80 ℃ when the temperature does not continuously rise, carrying out heat preservation reaction, and cooling to below 40 ℃; granulating the reaction product to obtain the anionic polyacrylamide. The invention has the advantages of simple synthesis process and no byproducts; meanwhile, the product of the invention has the characteristics of high viscosity, high interfacial activity and shearing resistance.
Description
Technical Field
The invention belongs to the technical field of tertiary oil recovery, and particularly relates to polymer polyacrylamide for tertiary oil recovery and a preparation method thereof.
Background
With the development of world economy and industry, the demand for petroleum by humans is increasing. Because of the large-scale centralized exploitation of petroleum in recent decades, oil field blocks with good oil reservoir geological conditions and low exploitation cost are nearly exhausted, and most of the rest oil fields are blocks with poor exploitation conditions or high exploitation cost. Tertiary oil recovery is one of the main measures to improve crude oil recovery, and polymer flooding plays an important role.
The most commonly used displacement polymers are mainly polyacrylamides and derivatives thereof. Polyacrylamide is a generic term for homopolymers and copolymers of acrylamide and its derivatives. Polymers with more than 50% AM monomer are commonly known in the industry as polyacrylamides. PAM is a linear water-soluble polymer, and is one of the most widely used varieties of water-soluble polymer compounds.
Polyacrylamide is used as an oil displacement agent in the petroleum exploitation industry, so that the viscosity of injected water is increased, the oil-water fluidity ratio is improved, the swept volume is enlarged, and the crude oil recovery ratio is improved. The polyacrylamide can be used alone or in combination with alkali, surfactant and the like to form a binary or ternary composite drive. Polymer flooding, binary and ternary composite flooding are main measures for further controlling oil extraction cost and improving recovery ratio in the later stage of oilfield water flooding.
The quality of the polyacrylamide determines the effect of improving the recovery ratio to a considerable extent, the tackifying effect is obvious, the high-temperature resistance and the high-salt resistance are good, the shearing resistance is good, the thermal stability is good, the viscosity of displacement fluid can be effectively increased, the sweep efficiency is improved, and the sweep volume is increased.
CN107987211a discloses a method for synthesizing quaternary copolymerized salt-resistant and temperature-resistant polyacrylamide, firstly adding acrylamide, salt-resistant function, temperature-resistant function, pH buffer monomer and deionized water into a reaction device to prepare a monomer mixed aqueous solution, adjusting the pH value to 5-8, introducing nitrogen to deoxidize, and simultaneously adding azo diiso Ding Mi hydrochloride; after the oxygen content is less than 0.1mg/L, controlling the temperature to be 0-8 ℃ for sealing reaction for 4-8 hours; and then crushing the colloid, mixing the colloid with a hydrolyzer, carrying out heat preservation reaction for 4-8 hours at 60-80 ℃, and drying and crushing to obtain a finished product. The invention has the advantages that the synthesis method is simple, and the synthesized finished product changes the single molecular structure of the prior polyacrylamide. The main chain introduces functional monomers to generate special functional groups, so that the sensitivity of the polyacrylamide to salt and temperature is reduced, the salt and temperature resistance of the polyacrylamide is greatly improved, the polyacrylamide is better suitable for tertiary oil recovery of high-salt and high-temperature oil reservoirs in oil fields, and meanwhile, the sewage can be utilized to prepare, so that the oil recovery cost is effectively reduced. However, the functional group of the surfactant in the molecular structure of the polyacrylamide has only carboxyl, and the effect of improving the recovery ratio by reducing the interfacial tension is limited.
CN105542073B discloses a preparation method of polyacrylamide for polymer flooding oil extraction, which belongs to the technical field of high polymers. The steps are as follows: uniformly mixing a cationic monomer, acrylamide, trimethylol methylamine, a surfactant and water, and then introducing nitrogen into the mixed solution; adding an initiator, heating, keeping the reaction, cooling, adding hydroxyethyl acrylate and dimethylchlorosilane into the mixture, adjusting the pH of a reaction system, heating, keeping the reaction, taking out the obtained gelatinous product after the reaction is finished, and obtaining a polyacrylamide product through cutting, drying, granulating and sieving. According to the invention, through adjusting the monomer reaction sequence of the modified polyacrylamide during polymerization, cationic monomers and acrylamide are partially polymerized, and then hydroxyethyl acrylate and dimethylchlorosilane are subjected to polymerization reaction continuously, the prepared modified polyacrylamide has the effect of increasing viscosity in a solution with high ion concentration. However, the viscosity of the polyacrylamide product of the invention is only about 30 mPas at a concentration of 1500mg/L, and the viscosity is not ideal as a polymer oil displacement viscosity.
Disclosure of Invention
The invention provides a polymer polyacrylamide for oil extraction and a preparation method thereof, aiming at the defects of the prior art. The invention has the advantages of simple synthesis process and no byproducts; meanwhile, the product of the invention has the characteristics of high viscosity, high interfacial activity and shearing resistance.
In order to achieve the above object, one of the objects of the present invention is to disclose a polymer polyacrylamide for tertiary oil recovery, wherein the molecular structural formula of the polymer polyacrylamide is as follows:
wherein:
a=80000-800000；
b=20000-400000；
c=5000-100000；
d=2000-40000；
e=5000-100000。
the viscosity average molecular weight of the high molecular polyacrylamide is as follows: 35000000-45000000.
The invention also discloses a preparation method of the high polymer polyacrylamide, which comprises the following specific steps:
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 5-10L/min, the ventilation time is 20-30min, and after the air in the reaction kettle is discharged for 15-20min, the ventilation speed is reduced to 50-100mL/min;
(2) Sequentially adding acrylamide, 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) methyl acrylate, allyl glycine, 1-vinyl-2-pyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid, an emulsifier, buffer salt and deionized water into a reaction kettle, stirring at a high speed of 2000-2200rpm, regulating pH to 8-8.5 with 4-5wt% sodium hydroxide solution, and reducing the stirring speed to 400-500rpm;
(3) Adding an initiator into a high-level dripping tank, slowly dripping the initiator into a reaction kettle, controlling the dripping time of the initiator to be 30-40min, automatically heating the solution in the dripping process, heating to 75-80 ℃ when the temperature is not continuously increased, preserving heat for reaction for 50-60min, and cooling to below 40 ℃;
(4) Granulating the reaction product in the step (3) to obtain the anionic polyacrylamide product with the particle diameter of 0.7-2.0 mm.
In the present invention, preferably, the methyl 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylate, allylglycine, 1-vinyl-2-pyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid are used in an amount of 0.2 to 0.5 molar parts, 0.05 to 0.2 molar parts, 0.02 to 0.1 molar parts, 0.05 to 0.2 molar parts, respectively, based on 1 molar part of acrylamide.
In the present invention, preferably, in the step (2), the emulsifier is one of OP-10 (octylphenol polyoxyethylene ether) and TX-10 (nonylphenol polyoxyethylene ether), and the weight ratio of the emulsifier to acrylamide is 0.02-0.1:1.
preferably, in the step (2), the buffer salt is one of ammonium acetate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate and diammonium hydrogen phosphate; more preferably, the buffer salt is one of ammonium acetate, sodium dihydrogen phosphate and potassium dihydrogen phosphate.
Preferably, in the step (2), the weight ratio of the buffer salt to the acrylamide is 0.01-0.02:1.
preferably, in the step (2), the weight ratio of deionized water to acrylamide is 8-10:1.
in the present invention, preferably, in the step (3), the initiator is one of 8-10wt% of potassium persulfate+4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of sodium persulfate+4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of ammonium persulfate+4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of azobisisobutyronitrile ethanol solution, and 8-10wt% of azobisisoheptonitrile ethanol solution; more preferably, the initiator is one of 8-10wt% of potassium persulfate and 4-5wt% of sodium sulfite mixed water solution, 8-10wt% of sodium persulfate and 4-5wt% of sodium sulfite mixed water solution and 8-10wt% of azodiisobutyronitrile ethanol solution.
Preferably, in the step (3), the weight ratio of the initiator to the acrylamide is 0.05-0.2:1.
the reaction equation of the polymer polyacrylamide synthesis for tertiary oil recovery is as follows:
the high polymer polyacrylamide is a five-membered high polymer taking acrylamide, 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) methyl acrylate, allyl glycine, 1-vinyl-2-pyrrolidone and 2-acrylamide-2-methylpropanesulfonic acid as monomers, and aims to improve the structure of the polyacrylamide so as to improve the oil extraction performance of the polyacrylamide. 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) methyl acrylate belongs to a fluorine-containing surfactant, has lower interfacial tension than a conventional surfactant, can emulsify crude oil better, contains benzene ring structures in molecules, and has stronger shearing resistance; allyl glycine contains carboxyl anions, so that the oil-water interfacial tension can be reduced, and the ions mutually repel after carboxyl ionization, so that the viscosity of the invention can be increased; the 1-vinyl-2-pyrrolidone has stronger rigidity, and can greatly improve the shearing resistance of products; the sulfonic group of the 2-acrylamide-2-methylpropanesulfonic acid has stronger temperature resistance and salt resistance, is a common anionic oil displacement surfactant, and can increase the viscosity of the invention by mutual rejection between ions after ionization, and the acrylamide is similar to the main unit acrylamide of the invention, so that the acrylamide can be polymerized better; OP-10 or TX-10 is a linear nonionic surfactant, has a good effect of reducing surface interfacial tension, and can sweep residual crude oil of a stratum.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The synthesis method adopted by the invention is a one-pot method, the sources of raw materials are wide, the synthesis process is simple, no byproducts are generated, and no environmental pollution exists;
(2) The high molecular polyacrylamide of the invention has better interfacial activity, and the concentration interfacial tension of 300mg/L is lower than 10 -2 mN/m；
(3) The high molecular polyacrylamide has higher surface viscosity, and the concentration viscosity of 2000mg/L reaches more than 110 mPa.s at 70 ℃;
(4) The high polymer polyacrylamide has the shearing resistance, and the viscosity retention rate reaches more than 92% after 2 hours of shearing.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The technical scheme of the invention is further described below by combining specific embodiments.
Example 1
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 5L/min, the ventilation time is 20min, and after 20min, the ventilation speed is reduced to 100mL/min;
(2) 1mol of acrylamide, 0.2mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.1mol of allyl glycine, 0.1mol of 1-vinyl-2-pyrrolidone, 0.2mol of 2-acrylamide-2-methylpropanesulfonic acid, 1.42g of OP-10, 0.71g of ammonium acetate and 568g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2000rpm, the pH value is regulated to 8-8.5 by using a sodium hydroxide solution with the concentration of 4wt%, and the stirring speed is reduced to 400rpm;
(3) 3.55g of initiator is added into the high-level dripping groove, the initiator is 8wt% of potassium persulfate and 4wt% of sodium sulfite mixed water solution, the dripping time of the initiator is controlled to be 30min, the solution is automatically heated in the dripping process, when the temperature is not continuously increased, the solution is heated to 75 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 1 。
Example 2
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 10L/min, the ventilation time is 30min, and after the air in the reaction kettle is discharged for 15min, the ventilation speed is reduced to 50mL/min;
(2) 1mol of acrylamide, 0.23mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.05mol of allyl glycine, 0.09mol of 1-vinyl-2-pyrrolidone, 0.15mol of 2-acrylamido-2-methylpropanesulfonic acid, 1.86g of OP-10, 0.78g of ammonium acetate and 614g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2200rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 470rpm;
(3) Adding 4.4g of initiator into a high-level dripping groove, slowly dripping the initiator into a reaction kettle, wherein the initiator is a mixed aqueous solution of 10wt% of potassium persulfate and 5wt% of sodium sulfite, the dripping time of the initiator is controlled to be 40min, the solution automatically heats up in the dripping process, and when the temperature does not continuously rise any more, the solution is heated up to 78 ℃, reacts for 60min under heat preservation, and is cooled down to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 2 。
Example 3
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 5L/min, the ventilation time is 20min, and after the air in the reaction kettle is discharged for 15min, the ventilation speed is reduced to 60mL/min;
(2) 1mol of acrylamide, 0.27mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.08mol of allyl glycine, 0.08mol of 1-vinyl-2-pyrrolidone, 0.12mol of 2-acrylamido-2-methylpropanesulfonic acid, 2.74g of OP-10, 1.42g of ammonium acetate and 636g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2100rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 420rpm;
(3) 6.1g of initiator is added into the high-level dripping groove, the initiator is 9wt% sodium persulfate and 4wt% sodium sulfite mixed water solution, the dripping time of the initiator is controlled to be 40min, the solution is automatically heated up in the dripping process, when the temperature is not continuously increased, the solution is heated up to 79 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 3 。
Example 4
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 10L/min, the ventilation time is 30min, and after 18min, the ventilation speed is reduced to 80mL/min;
(2) 1mol of acrylamide, 0.3mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.12mol of allyl glycine, 0.02mol of 1-vinyl-2-pyrrolidone, 0.11mol of 2-acrylamido-2-methylpropanesulfonic acid, 4.76g of OP-10, 1.36g of ammonium acetate and 685g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2000rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 480rpm;
(3) Adding 7.2g of initiator into a high-level dripping groove, slowly dripping the initiator into a reaction kettle, wherein the initiator is 8wt% of sodium persulfate and 5wt% of sodium sulfite mixed water solution, the dripping time of the initiator is controlled to be 30min, and in the dripping process, the solution automatically heats up, when the temperature does not continuously rise any more, the solution is heated up to 77 ℃, the temperature is kept for reaction for 60min, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 4 。
Example 5
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 8L/min, the ventilation time is 25min, and after 16min, the ventilation speed is reduced to 70mL/min;
(2) 1mol of acrylamide, 0.35mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.15mol of allyl glycine, 0.03mol of 1-vinyl-2-pyrrolidone, 0.14mol of 2-acrylamido-2-methylpropanesulfonic acid, 5.25g of OP-10, 1.25g of sodium dihydrogen phosphate and 640g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2200rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 450rpm;
(3) 8.6g of initiator is added into the high-level dripping groove, the initiator is mixed water solution of 10wt% ammonium persulfate and 4wt% sodium sulfite, the dripping time of the initiator is controlled to be 32min, the solution is automatically heated in the dripping process, when the temperature is not continuously increased, the solution is heated to 78 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 5 。
Example 6
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 8L/min, the ventilation time is 25min, and after 17min, the ventilation speed is reduced to 90mL/min;
(2) 1mol of acrylamide, 0.38mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.12mol of allyl glycine, 0.04mol of 1-vinyl-2-pyrrolidone, 0.18mol of 2-acrylamido-2-methylpropanesulfonic acid, 6.33g of TX-10, 1.07g of potassium dihydrogen phosphate and 650g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2050rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 450rpm;
(3) Adding 10.1g of initiator into a high-level dropwise adding tank, wherein the initiator is 8wt% ammonium persulfate and 5wt% sodium sulfite mixed aqueous solution, slowly dropwise adding the initiator into a reaction kettle, controlling the dropwise adding time of the initiator to be 36min, automatically heating the solution in the dropwise adding process, heating to 76 ℃ when the temperature does not continuously rise any more, preserving heat for reaction for 60min, and cooling to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 6 。
Example 7
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 6L/min, the ventilation time is 25min, and after the air in the reaction kettle is discharged for 15min, the ventilation speed is reduced to 60mL/min;
(2) 1mol of acrylamide, 0.4mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.15mol of allyl glycine, 0.05mol of 1-vinyl-2-pyrrolidone, 0.05mol of 2-acrylamido-2-methylpropanesulfonic acid, 6.78g of TX-10, 0.96g of monoammonium phosphate and 660g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2150rpm, pH is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 500rpm;
(3) 11.2g of initiator is added into the high-level dripping groove, the initiator is 8wt% azodiisobutyronitrile ethanol solution, the dripping time of the initiator is controlled to be 35min, the solution is automatically heated in the dripping process, when the temperature is not continuously increased, the solution is heated to 75 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 7 。
Example 8
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 6L/min, the ventilation time is 26min, the air of the reaction kettle is discharged, and the ventilation speed is reduced to 50mL/min after 19 min;
(2) 1mol of acrylamide, 0.45mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.2mol of allyl glycine, 0.07mol of 1-vinyl-2-pyrrolidone, 0.09mol of 2-acrylamido-2-methylpropanesulfonic acid, 5.86g of TX-10, 0.99g of disodium hydrogen phosphate and 694g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2100rpm, pH is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 400rpm;
(3) Adding 12.2g of initiator into a high-level dripping groove, slowly dripping the initiator into a reaction kettle, wherein the dripping time of the initiator is controlled to be 38min, and when the temperature does not continuously rise, the solution is heated to 80 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product with the particle diameter of 0.7-2.0mmN 8 。
Example 9
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 5L/min, the ventilation time is 22min, the air of the reaction kettle is discharged, and the ventilation speed is reduced to 90mL/min after 20 min;
(2) 1mol of acrylamide, 0.5mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.18mol of allyl glycine, 0.06mol of 1-vinyl-2-pyrrolidone, 0.08mol of 2-acrylamido-2-methylpropanesulfonic acid, 6.98g of TX-10, 1.24g of dipotassium hydrogen phosphate and 702g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2000rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 400rpm;
(3) 13.8g of initiator is added into the high-level dripping groove, the initiator is 10wt% azodiisoheptonitrile ethanol solution, the dripping time of the initiator is controlled to be 40min, the solution is automatically heated in the dripping process, when the temperature is not continuously increased, the solution is heated to 75 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 9 。
Example 10
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 10L/min, the ventilation time is 28min, and after 17min, the ventilation speed is reduced to 60mL/min;
(2) 1mol of acrylamide, 0.5mol of 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylic acid methyl ester, 0.2mol of allyl glycine, 0.08mol of 1-vinyl-2-pyrrolidone, 0.05mol of 2-acrylamido-2-methylpropanesulfonic acid, 7.1g of TX-10, 1.41g of diammonium hydrogen phosphate and 710g of deionized water are sequentially added into a reaction kettle, stirring is carried out at a high speed of 2200rpm, the pH value is regulated to 8-8.5 by using a 4wt% sodium hydroxide solution, and the stirring speed is reduced to 500rpm;
(3) 14.2g of initiator is added into the high-level dripping groove, the initiator is 9wt% azodiisoheptonitrile ethanol solution, the dripping time of the initiator is controlled to be 30min, the solution is automatically heated in the dripping process, when the temperature is not continuously increased, the solution is heated to 80 ℃, the temperature is kept for 60min for reaction, and the temperature is reduced to below 40 ℃;
(4) Granulating the reaction product in step (3) to obtain a polymer polyacrylamide product N with the particle diameter of 0.7-2.0mm 10 。
Example 11 testing of surface tension and interfacial tension
The invention uses tap water to prepare 300mg/L solution, and the surface tension is measured by referring to the pull-tab method in SY/T5370-2018 surface and interfacial tension measuring method, and the interfacial tension is measured by using the hanging drop method. The PAM for oil displacement of Shandong Dongying Bao environmental engineering Co., ltd was used as a comparative sample, and the test results are shown in Table 1.
As can be seen from table 1:
(1) The polymer polyacrylamide N of the invention 1 -N 10 Has a surface tension of less than 30mN/m, where N 10 A minimum of 25.3mN/m; the surface tension of the comparative sample is 40.3mN/m, which is obviously higher than that of the invention;
(2) The polymer polyacrylamide N of the invention 1 -N 10 Is less than 1.0X10 -2 mN/m, where N 10 A minimum of 0.0044mN/m; whereas the surface tension of the comparative sample was 5.8mN/m, which is significantly higher than that of the present invention.
Example 12 apparent viscosity test
The present invention was prepared with tap water in a 2000mg/L concentration solution and the apparent viscosity was measured with a Hark rheometer at 60 ℃. The PAM for oil displacement of Shandong Dongying Bao environmental engineering Co., ltd was used as a comparative sample, and the test results are shown in Table 1.
As can be seen from table 1:
the polymer polyacrylamide N of the invention 1 -N 10 Apparent viscosity of greater than 110 mPas, where N 10 Up to 126 mPas; whereas the apparent viscosity of the comparative sample was 54 mPas, which was significantly lower than that of the invention.
Example 13 shear resistance test
The sample in example 12At 60 ℃ and 170S - Continuously shearing for 2 hours under the condition of (2) and testing apparent viscosity to calculate the viscosity retention rate. The PAM for oil displacement of Shandong Dongying Bao environmental engineering Co., ltd was used as a comparative sample, and the test results are shown in Table 1.
TABLE 1 results of surface tension, interfacial tension, apparent viscosity, shear resistance test
| Sample of | Surface tension, mN/m | Interfacial tension, mN/m | Apparent viscosity, mPas | Viscosity after shearing, mPa.s | Viscosity retention, percent |
| N1 | 26.8 | 0.0071 | 114 | 110 | 96.5 |
| N2 | 27 | 0.0078 | 118 | 112 | 94.9 |
| N3 | 26.9 | 0.007 | 122 | 115 | 94.3 |
| N4 | 26.7 | 0.0068 | 117 | 110 | 94.0 |
| N5 | 26.3 | 0.006 | 120 | 111 | 92.5 |
| N6 | 26.2 | 0.0058 | 111 | 104 | 93.7 |
| N7 | 25.8 | 0.0052 | 115 | 109 | 94.8 |
| N8 | 26 | 0.0055 | 122 | 118 | 96.7 |
| N9 | 25.5 | 0.0048 | 122 | 117 | 95.9 |
| N10 | 25.3 | 0.0044 | 126 | 120 | 95.2 |
| Comparative sample | 40.3 | 5.8 | 54 | 44 | 81.5 |
As can be seen from table 1: at 50 ℃ and 170S - Continuously shearing for 2h under the condition of the polymer polyacrylamide N 1 -N 10 Has a viscosity retention of greater than 92%, where N 8 Up to 96.7%; the comparative sample had a viscosity retention of 81.5% which was significantly lower than the present invention.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. The preparation method of the polymer polyacrylamide for tertiary oil recovery is characterized by comprising the following specific steps of:
(1) Introducing nitrogen into the reaction kettle, wherein the ventilation speed is 5-10L/min, the ventilation time is 20-30min, and after the air in the reaction kettle is discharged for 15-20min, the ventilation speed is reduced to 50-100mL/min;
(2) Sequentially adding acrylamide, 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) methyl acrylate, allyl glycine, 1-vinyl-2-pyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid, an emulsifier, buffer salt and deionized water into a reaction kettle, stirring at a high speed of 2000-2200rpm, regulating pH to 8-8.5 with 4-5wt% sodium hydroxide solution, and reducing the stirring speed to 400-500rpm;
(3) Adding an initiator into a high-level dripping tank, slowly dripping the initiator into a reaction kettle, controlling the dripping time of the initiator to be 30-40min, automatically heating the solution in the dripping process, heating to 75-80 ℃ when the temperature is not continuously increased, preserving heat for reaction for 50-60min, and cooling to below 40 ℃;
(4) Granulating the reaction product in the step (3) to obtain the anionic polyacrylamide product with the particle diameter of 0.7-2.0 mm.
2. The method for preparing polymer polyacrylamide for tertiary oil recovery according to claim 1, wherein the amount of methyl 3- (2-amino-5-bromo-3- (trifluoromethyl) phenyl) acrylate, allylglycine, 1-vinyl-2-pyrrolidone, and 2-acrylamido-2-methylpropanesulfonic acid is 0.2 to 0.5 mole parts, 0.05 to 0.2 mole parts, 0.02 to 0.1 mole parts, and 0.05 to 0.2 mole parts, respectively, based on 1 mole part of acrylamide.
3. The method for preparing the polymer polyacrylamide for tertiary oil recovery according to claim 1, wherein in the step (2), the emulsifier is one of OP-10 (octylphenol polyoxyethylene ether) and TX-10 (nonylphenol polyoxyethylene ether), and the weight ratio of the emulsifier to the acrylamide is 0.02-0.1:1.
4. the method for preparing polymer polyacrylamide for tertiary oil recovery according to claim 1, wherein in the step (2), the buffer salt is one of ammonium acetate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate and diammonium hydrogen phosphate.
5. The method for preparing the polymer polyacrylamide for tertiary oil recovery according to claim 1 or 4, wherein the weight ratio of the buffer salt to the acrylamide is 0.01-0.02:1.
6. the method for preparing polymer polyacrylamide for tertiary oil recovery according to claim 1, wherein in the step (3), the initiator is one of 8-10wt% of potassium persulfate+4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of sodium persulfate+4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of ammonium persulfate+4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of azobisisobutyronitrile ethanol solution and 8-10wt% of azobisisoheptonitrile ethanol solution.
7. The method for preparing the polymer polyacrylamide for tertiary oil recovery according to claim 6, wherein the initiator is one of 8-10wt% of potassium persulfate, 4-5wt% of sodium sulfite mixed aqueous solution, 8-10wt% of sodium persulfate, 4-5wt% of sodium sulfite mixed aqueous solution and 8-10wt% of azodiisobutyronitrile ethanol solution.
8. The method for preparing polymer polyacrylamide for tertiary oil recovery according to claim 1, wherein in the step (3), the weight ratio of the initiator to the acrylamide is 0.05-0.2:1.
9. the polymer polyacrylamide for tertiary oil recovery is characterized by having the following molecular structural formula:
wherein:
a=80000-800000；
b=20000-400000；
c=5000-100000；
d=2000-40000；
e=5000-100000。
10. the polymeric polyacrylamide for tertiary oil recovery of claim 9 wherein said polymeric polyacrylamide has a viscosity average molecular weight of 35000000-45000000.
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| CN101274974A (en) * | 2008-04-29 | 2008-10-01 | 成都理工大学 | Temperature-resistant water-soluble copolymer, preparation and use thereof |
| US20160304647A1 (en) * | 2015-06-22 | 2016-10-20 | Masoom Shaban | Salt-resistant hydrophobically modified copolymer nanostructures as viscosity increasing agents for enhanced oil recovery |
| CN111732687A (en) * | 2020-05-26 | 2020-10-02 | 西南石油大学 | Shear-resistant salt-resistant fracturing fluid thickening agent |
| CN114805672A (en) * | 2022-06-24 | 2022-07-29 | 山东科兴化工有限责任公司 | Degradable temporary plugging agent for oil-gas well as synthetic method and application thereof |
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| CN101274974A (en) * | 2008-04-29 | 2008-10-01 | 成都理工大学 | Temperature-resistant water-soluble copolymer, preparation and use thereof |
| US20160304647A1 (en) * | 2015-06-22 | 2016-10-20 | Masoom Shaban | Salt-resistant hydrophobically modified copolymer nanostructures as viscosity increasing agents for enhanced oil recovery |
| CN111732687A (en) * | 2020-05-26 | 2020-10-02 | 西南石油大学 | Shear-resistant salt-resistant fracturing fluid thickening agent |
| CN114805672A (en) * | 2022-06-24 | 2022-07-29 | 山东科兴化工有限责任公司 | Degradable temporary plugging agent for oil-gas well as synthetic method and application thereof |
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