CN113667072A - Preparation method and application of salt-tolerant hydrophobic polymer - Google Patents
Preparation method and application of salt-tolerant hydrophobic polymer Download PDFInfo
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- 229920001600 hydrophobic polymer Polymers 0.000 title abstract description 6
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 54
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 53
- 239000000178 monomer Substances 0.000 claims abstract description 33
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 239000007864 aqueous solution Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 16
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims abstract description 10
- 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 abstract description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 10
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 claims abstract description 10
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 8
- 238000010008 shearing Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010298 pulverizing process Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 239000003999 initiator Substances 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 46
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 30
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 21
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 15
- VHRYZQNGTZXDNX-UHFFFAOYSA-N methacryloyl chloride Chemical compound CC(=C)C(Cl)=O VHRYZQNGTZXDNX-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000012074 organic phase Substances 0.000 claims description 5
- -1 polyoxyethylene lauryl ether Polymers 0.000 claims description 5
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 claims description 5
- 238000002390 rotary evaporation Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- ILWRPSCZWQJDMK-UHFFFAOYSA-N triethylazanium;chloride Chemical compound Cl.CCN(CC)CC ILWRPSCZWQJDMK-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims 3
- SFNALCNOMXIBKG-UHFFFAOYSA-N ethylene glycol monododecyl ether Chemical compound CCCCCCCCCCCCOCCO SFNALCNOMXIBKG-UHFFFAOYSA-N 0.000 claims 1
- 230000015784 hyperosmotic salinity response Effects 0.000 abstract description 7
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 9
- 229940051841 polyoxyethylene ether Drugs 0.000 description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000000518 rheometry Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/062—Polyethers
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
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Abstract
The invention provides a preparation method and application of a salt-tolerant hydrophobic polymer, wherein the hydrophobic polymer is prepared from acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer; the preparation process comprises the following steps: mixing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer to obtain a mixture, adding water into the mixture to prepare an aqueous solution with the mass concentration of the mixture being 25-30%, adding sodium dodecyl sulfate into the aqueous solution, uniformly mixing, then carrying out deoxidization treatment, adding an initiator with the mass concentration of 0.05-0.3% of the mixture into the aqueous solution, continuing to react for 6-8 hours to obtain a pentapolymer, shearing the pentapolymer, soaking in absolute ethyl alcohol, drying and pulverizing to obtain the pentapolymer. The quinary hydrophobic association polymer can effectively solve the problem of poor salt tolerance of the existing polymer.
Description
Technical Field
The invention belongs to the technical field of fracturing fluid, and particularly relates to a salt-tolerant five-membered hydrophobic association polymer, and a preparation method and application thereof.
Background
Along with large-scale exploitation and consumption of conventional oil and gas reservoirs, unconventional oil and gas resources with low permeability, ultralow permeability, deep-layer high temperature and the like such as compact sandstone gas, coal bed gas, shale gas and the like are in urgent need to be developed and utilized. Fracturing is an important means for increasing the production of oil and gas wells and increasing the injection of water injection wells. Particularly, in the recent years, the fracturing fluid is the most common in the unconventional oil and gas development process, is the working fluid in the process of hydraulic fracturing modification of an oil-gas layer, and plays roles in forming formation cracks, transferring pressure and carrying a propping agent into the cracks in the fracturing process. The performance of the fracturing fluid directly influences success or failure of fracturing construction and yield increasing effect after fracturing.
The hydrophobic association polymer is a water-soluble polymer with a small amount of hydrophobic functional monomers on the molecular chain of the polymer. Due to the introduction of a small amount of hydrophobic monomers, in a polymer solution, the hydrophobic monomers are subjected to association, so that polymer molecules are aggregated to form a supermolecular structure, and the supermolecular structure shows special rheological properties and has good properties of thickening, temperature resistance, salt resistance, shear resistance and the like, so that the supermolecular structure is widely concerned, and is prepared into fracturing fluid which is applied to oilfield fracturing and the improvement of recovery ratio. The polymer fracturing fluid commonly used in the prior fracturing fluid has the defect of poor salt resistance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a salt-tolerant quinary hydrophobic associated polymer, a preparation method and application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a salt-tolerant quinary hydrophobic association polymer is characterized in that the quinary hydrophobic association polymer has the following structural formula:
wherein, the monomer
Is hydrophobic monomer, x, y, z, m and n are monomer mole percentages, x is 70-85%, y is 12-15%, z is 1-5%, m is 1-5%, and n is 1-5%.
Further, the synthesis method of the hydrophobic monomer comprises the following steps:
dissolving polyoxyethylene lauryl ether and triethylamine (the molar ratio is 1: 1) in a dry dichloromethane solution, dissolving a proper amount of methacryloyl chloride in another proper amount of dichloromethane, slowly dripping the methacryloyl chloride solution into the polyoxyethylene lauryl ether solution at 0 ℃, reacting for 18-24 hours at room temperature after dripping is finished, filtering to remove triethylamine hydrochloride after the reaction is finished, mixing and extracting the filtered solution and a saturated sodium chloride solution, drying an organic phase with anhydrous sodium sulfate, then performing rotary evaporation to remove a solvent, and drying to obtain a waxy yellow solid, namely a target product.
Further, the ratio of the molar weight of the methacryloyl chloride added in the hydrophobic monomer synthesis step to the molar weight of the polyoxyethylene lauryl ether is 1.2: 1.
Further, the synthesis steps of the hydrophobic monomers are schematically shown as follows:
further, mixing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer to obtain a mixture, adding water into the mixture to prepare an aqueous solution with the mass concentration of the mixture being 25-30%, adding sodium dodecyl sulfate into the aqueous solution, uniformly mixing, then carrying out deoxidization treatment, adding an initiator with the mass concentration of 0.05-0.3% of the mixture into the aqueous solution, continuing to react for 6-8 hours to obtain a pentapolymer, cutting the pentapolymer into pieces, soaking the pieces in absolute ethyl alcohol, drying and pulverizing to obtain the pentapolymer.
Further, the initiator is 2, 2-azobisisobutylamidine dihydrochloride.
Further, the mole number of the sodium dodecyl sulfate accounts for 0.3-0.7% of the mole number of the hydrophobic monomer.
Further, the reaction formula of the chemical reaction process of the five-membered hydrophobic association polymer is as follows:
the application of the five-membered hydrophobic association polymer in pressure fluid.
A fracturing fluid comprising the above hydrophobically associating polymer.
The invention has the beneficial effects that:
the salt-tolerant five-membered hydrophobic association polymer has a sulfonate group and a hydrophobic long chain, the sulfonate group has strong salt resistance and stronger hydration, the hydrophobic monomer is a branched chain structure and has good salt tolerance, and the salt tolerance of the hydrophobic association polymer can be improved by introducing the three groups into the hydrophobic association polymer.
The fracturing fluid disclosed by the invention is high in viscosity and good in salt resistance.
Drawings
FIG. 1 shows the salt tolerance of the quinary hydrophobically associating polymer solution obtained in example 1;
FIG. 2 is the temperature resistance of the pentabasic hydrophobically associating polymer solution obtained in example 1;
FIG. 3 is the salt tolerance of the quinary hydrophobically associating polymer solution obtained in example 2;
FIG. 4 shows the temperature resistance of the five-membered hydrophobically associating polymer solution obtained in example 2.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example 1
A salt-tolerant quinary hydrophobic association polymer is prepared by the following steps:
mixing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer to obtain a mixture, wherein the total mole number of all substances in the mixture is taken as the total mole number, wherein the acrylamide accounts for 70% of the total mole number, the acrylic acid accounts for 15% of the total mole number, the 2-acrylamido-2-methylpropanesulfonic acid accounts for 5% of the total mole number, the octadecyl methacrylate accounts for 5% of the total mole number, and the hydrophobic monomer accounts for 5% of the total mole number; adding water into the mixture to prepare an aqueous solution with the mass concentration of 30%, adding sodium dodecyl sulfate with the mole number of 0.7% of hydrophobic monomer into the aqueous solution, uniformly mixing, introducing nitrogen into the aqueous solution to remove oxygen for 30min, adding 2, 2-azobisisobutylamidine dihydrochloride with the mass of 0.05% of the mixture, continuously reacting at room temperature for 8h to prepare a pentapolymer, shearing the pentapolymer, soaking in absolute ethyl alcohol, drying and pulverizing to obtain the pentapolymer.
The chemical formula of the five-membered hydrophobic association polymer is as follows:
wherein, the synthesis process of the hydrophobic monomer is as follows: dissolving lauryl alcohol polyoxyethylene ether and triethylamine (the molar ratio is 1: 1) in a dry dichloromethane solution, dissolving methacrylic acid chloride in a proper amount of dichloromethane (the molar ratio of the methacrylic acid chloride to the lauryl alcohol polyoxyethylene ether is 1.2:1), slowly dripping the methacrylic acid chloride solution into the lauryl alcohol polyoxyethylene ether solution at 0 ℃, reacting for 18-24 hours at room temperature after dripping is finished, filtering to remove triethylamine hydrochloride after the reaction is finished, mixing and extracting the filtered solution and a saturated sodium chloride solution, drying an organic phase with anhydrous sodium sulfate, and then removing a solvent by rotary evaporation, and drying to obtain a waxy yellow solid, namely the target product.
A fracturing fluid comprising the five-membered hydrophobically associating polymer.
Example 2
A salt-tolerant quinary hydrophobic association polymer is prepared by the following steps:
mixing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer to obtain a mixture, wherein the total mole number of all substances in the mixture is taken as the total mole number, wherein the acrylamide accounts for 85% of the total mole number, the acrylic acid accounts for 12% of the total mole number, the 2-acrylamido-2-methylpropanesulfonic acid accounts for 1% of the total mole number, the octadecyl methacrylate accounts for 1% of the total mole number, and the hydrophobic monomer accounts for 1% of the total mole number; adding water into the mixture to prepare an aqueous solution with the mass concentration of 30%, adding sodium dodecyl sulfate with the mole number of 0.3% of hydrophobic monomer into the aqueous solution, uniformly mixing, introducing nitrogen into the aqueous solution to remove oxygen for 30min, adding 2, 2-azobisisobutylamidine dihydrochloride with the mass of 0.3% of the mixture, continuously reacting at room temperature for 6h to prepare a pentapolymer, shearing the pentapolymer, soaking the pentapolymer in absolute ethyl alcohol, drying and pulverizing to obtain the pentapolymer.
The chemical formula of the five-membered hydrophobic association polymer is as follows:
wherein, the synthesis process of the hydrophobic monomer is as follows: dissolving lauryl alcohol polyoxyethylene ether and triethylamine (the molar ratio is 1: 1) in a dry dichloromethane solution, dissolving methacrylic acid chloride in a proper amount of dichloromethane (the molar ratio of the methacrylic acid chloride to the lauryl alcohol polyoxyethylene ether is 1.2:1), slowly dripping the methacrylic acid chloride solution into the lauryl alcohol polyoxyethylene ether solution at 0 ℃, reacting for 18-24 hours at room temperature after dripping is finished, filtering to remove triethylamine hydrochloride after the reaction is finished, mixing and extracting the filtered solution and a saturated sodium chloride solution, drying an organic phase with anhydrous sodium sulfate, and then removing a solvent by rotary evaporation, and drying to obtain a waxy yellow solid, namely the target product.
A fracturing fluid comprising the above hydrophobically associating polymer.
Example 3
A salt-tolerant quinary hydrophobic association polymer is prepared by the following steps:
mixing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer to obtain a mixture, wherein the total mole number of all substances in the mixture is taken as the total mole number, wherein the acrylamide accounts for 77.5 percent of the total mole number, the acrylic acid accounts for 13.5 percent of the total mole number, the 2-acrylamido-2-methylpropanesulfonic acid accounts for 3 percent of the total mole number, the octadecyl methacrylate accounts for 3 percent of the total mole number, and the hydrophobic monomer accounts for 3 percent of the total mole number; adding water into the mixture to prepare an aqueous solution with the mass concentration of 30%, adding sodium dodecyl sulfate with the mole number of 0.6% of hydrophobic monomer into the aqueous solution, uniformly mixing, introducing nitrogen into the aqueous solution to remove oxygen for 30min, adding 2, 2-azobisisobutylamidine dihydrochloride with the mass of 0.15% of the mixture, continuously reacting at room temperature for 8h to prepare a pentapolymer, shearing the pentapolymer, soaking in absolute ethyl alcohol, drying and pulverizing to obtain the pentapolymer.
The chemical formula of the five-membered hydrophobic association polymer is as follows:
wherein, the synthesis process of the hydrophobic monomer is as follows: dissolving lauryl alcohol polyoxyethylene ether and triethylamine (the molar ratio is 1: 1) in a dry dichloromethane solution, dissolving methacrylic acid chloride in a proper amount of dichloromethane (the molar ratio of the methacrylic acid chloride to the lauryl alcohol polyoxyethylene ether is 1.2:1), slowly dripping the methacrylic acid chloride solution into the lauryl alcohol polyoxyethylene ether solution at 0 ℃, reacting for 18-24 hours at room temperature after dripping is finished, filtering to remove triethylamine hydrochloride after the reaction is finished, mixing and extracting the filtered solution and a saturated sodium chloride solution, drying an organic phase with anhydrous sodium sulfate, and then removing a solvent by rotary evaporation, and drying to obtain a waxy yellow solid, namely the target product.
A fracturing fluid comprising the above hydrophobically associating polymer.
Experimental example 1
Sodium chloride solutions of different concentrations were prepared, and the five-membered hydrophobic polymer prepared in example 1 was added with sodium chloride solutions of different concentrations, respectively, to prepare 0.6% polymer aqueous solutions, and the polymer solution viscosity was measured using a six-speed viscometer. The viscosity of the polymer solution as a function of sodium chloride concentration is shown in FIG. 1.
As can be seen from fig. 1, the polymer synthesized in example 1 exhibited good salt tolerance, since the viscosity of the prepared solution increased after decreasing with increasing sodium chloride concentration, and the viscosity retention rate was always maintained at 70% or more.
The rheology of the hydrophobically associative polymer of example 1 formulated into a 0.6% solution was tested and the specific rheology curve is shown in FIG. 2.
As can be seen from FIG. 2, the hydrophobically associative polymer in example 1 was prepared as a 0.6% solution at 120 ℃ for 170s-1The viscosity under shearing is higher than 50mPa.s, and the seawater-based solution of the hydrophobically associating polymer in the example 1 meets the requirement of an industry standard SY/T6376-2008.
Experimental example 2
Sodium chloride solutions of different concentrations were prepared, and the five-membered hydrophobic polymer prepared in example 2 was added with sodium chloride solutions of different concentrations, respectively, to prepare 0.6% polymer aqueous solutions, and the polymer solution viscosity was measured using a six-speed viscometer. The viscosity of the polymer solution as a function of sodium chloride concentration is shown in FIG. 3.
As can be seen from fig. 3, the polymer synthesized in example 2 exhibited good salt tolerance, since the viscosity of the prepared solution increased after decreasing with increasing sodium chloride concentration, and the viscosity retention rate was always maintained at 70% or more.
The rheology of the hydrophobically associative polymer of example 2 formulated into a 0.6% solution was tested and the specific rheology curve is shown in FIG. 4.
As can be seen from FIG. 4, the hydrophobically associative polymer in example 2 was prepared as a 0.6% solution at 120 ℃ for 170s-1The viscosity under shearing is higher than 50mPa.s, and the seawater-based solution of the hydrophobically associating polymer in the example 2 meets the requirement of an industry standard SY/T6376-2008.
Claims (8)
1. A salt-tolerant hydrophobically associative polymer, wherein the hydrophobically associative polymer has a structural formula as follows:
wherein, the monomer
Is hydrophobic monomer, x, y, z, m and n are monomer mole percentages, x is 70-85%, y is 12-15%, z is 1-5%, m is 1-5%, and n is 1-5%.
2. The salt-tolerant hydrophobic associative polymer according to claim 1, wherein said hydrophobic monomer is synthesized by a method comprising the steps of:
dissolving polyoxyethylene lauryl ether and triethylamine (the molar ratio is 1: 1) in a dry dichloromethane solution, dissolving a proper amount of methacryloyl chloride in another proper amount of dichloromethane, slowly dripping the methacryloyl chloride solution into the polyoxyethylene lauryl ether solution at 0 ℃, reacting for 18-24 hours at room temperature after dripping is finished, filtering to remove triethylamine hydrochloride after the reaction is finished, mixing and extracting the filtered solution and a saturated sodium chloride solution, drying an organic phase with anhydrous sodium sulfate, then performing rotary evaporation to remove a solvent, and drying to obtain a waxy yellow solid, namely a target product.
3. The salt-tolerant pentanary hydrophobic association polymer of claim 2, wherein the ratio of the molar amount of methacryloyl chloride to the molar amount of laureth in the hydrophobic monomer synthesis step is 1.2: 1.
4. The method for preparing the salt-tolerant five-membered hydrophobic association polymer according to any one of claims 1 to 3, wherein the salt-tolerant five-membered hydrophobic association polymer is prepared by mixing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, octadecyl methacrylate and a hydrophobic monomer to obtain a mixture, adding water into the mixture to prepare an aqueous solution with the mass concentration of the mixture being 25 to 30%, adding sodium dodecyl sulfate into the aqueous solution, uniformly mixing, then carrying out oxygen removal treatment, adding an initiator with the mass of 0.05 to 0.3% of the mixture into the aqueous solution, continuously reacting for 6 to 8 hours to obtain a five-membered copolymer, shearing the five-membered copolymer, soaking the five-membered copolymer in absolute ethyl alcohol, drying and pulverizing.
5. The method for preparing the salt-tolerant five-membered hydrophobic association polymer according to claim 4, wherein the initiator is 2, 2-azobisisobutylamidine dihydrochloride.
6. The method for preparing the salt-tolerant five-membered hydrophobic association polymer according to claim 4, wherein the mole number of the sodium dodecyl sulfate is 0.3-0.7% of the mole number of the hydrophobic monomer.
7. Use of a hydrophobically associative polymer according to any of claims 1 to 3 primarily in fracturing fluids.
8. A fracturing fluid comprising the hydrophobically associative polymer according to any one of claims 1 to 3.
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Cited By (2)
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| CN114907531A (en) * | 2022-06-28 | 2022-08-16 | 西南石油大学 | Preparation method of salt-responsive hydrophobically associating polymer and application of salt-responsive hydrophobically associating polymer in fracturing fluid |
| CN114957545A (en) * | 2022-05-19 | 2022-08-30 | 西南石油大学 | Preparation method and application of high-performance hydrophobically associating polymer thickener |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4921902A (en) * | 1984-02-02 | 1990-05-01 | The Dow Chemical Company | Hydrophobie associative composition containing a polymer of a water-soluble monomer and an amphiphilic monomer |
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| CN114907531A (en) * | 2022-06-28 | 2022-08-16 | 西南石油大学 | Preparation method of salt-responsive hydrophobically associating polymer and application of salt-responsive hydrophobically associating polymer in fracturing fluid |
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