CN116622023A - Water-based fracturing thickening agent and preparation method thereof - Google Patents
Water-based fracturing thickening agent and preparation method thereof Download PDFInfo
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- CN116622023A CN116622023A CN202310903792.2A CN202310903792A CN116622023A CN 116622023 A CN116622023 A CN 116622023A CN 202310903792 A CN202310903792 A CN 202310903792A CN 116622023 A CN116622023 A CN 116622023A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002562 thickening agent Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000003999 initiator Substances 0.000 claims abstract description 29
- FSAJWMJJORKPKS-UHFFFAOYSA-N octadecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C=C FSAJWMJJORKPKS-UHFFFAOYSA-N 0.000 claims abstract description 17
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims abstract description 16
- YJKHMSPWWGBKTN-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)F YJKHMSPWWGBKTN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229940047670 sodium acrylate Drugs 0.000 claims abstract description 16
- 239000008139 complexing agent Substances 0.000 claims abstract description 11
- 239000012986 chain transfer agent Substances 0.000 claims abstract description 10
- XMPZTFVPEKAKFH-UHFFFAOYSA-P ceric ammonium nitrate Chemical compound [NH4+].[NH4+].[Ce+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O XMPZTFVPEKAKFH-UHFFFAOYSA-P 0.000 claims description 46
- 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 24
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 23
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims description 15
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 12
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical group [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 10
- 239000004280 Sodium formate Substances 0.000 claims description 10
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical group [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims description 10
- 235000019254 sodium formate Nutrition 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000000084 colloidal system Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 4
- 229910052757 nitrogen Inorganic materials 0.000 claims 2
- 239000003607 modifier Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 20
- 229920001938 Vegetable gum Polymers 0.000 abstract description 5
- 239000011550 stock solution Substances 0.000 abstract description 4
- 239000007790 solid phase Substances 0.000 abstract description 2
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 9
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 9
- 238000010008 shearing Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920001059 synthetic polymer Polymers 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 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 description 1
- JDXXTKLHHZMVIO-UHFFFAOYSA-N 2-(3-hydroxypropyl)guanidine Chemical compound NC(=N)NCCCO JDXXTKLHHZMVIO-UHFFFAOYSA-N 0.000 description 1
- 101100177544 Arabidopsis thaliana FC2 gene Proteins 0.000 description 1
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 1
- 229920000926 Galactomannan Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- -1 hydroxypropyl Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008719 thickening Effects 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
-
- 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
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
-
- 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
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
-
- 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
- C09K8/60—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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses a water-based fracturing thickener and a preparation method thereof, belonging to the technical field of thickener preparation, and comprising the following components: water, 2-acrylamide-2-methylpropanesulfonate, N-dimethylacrylamide, sodium acrylate, octadecyl acrylate, dodecafluoroheptyl methacrylate, a complexing agent, a chain transfer agent and an initiator. The thickener provided by the invention is artificially synthesized, so that the thickener does not contain a large amount of water insoluble matters like vegetable gum, the thickener is completely dissolved in the fracturing fluid stock solution, the water insoluble matters are basically zero, the thickener does not contain solid phase components, the prepared fracturing fluid stock solution is transparent, the residue content after gum breaking is greatly reduced compared with a vegetable gum fracturing fluid system, and the thickener has the advantages of less residue content, low use viscosity, low cost, easiness in flowback and the like.
Description
Technical Field
The invention relates to the technical field of thickener preparation, in particular to a water-based fracturing thickener and a preparation method thereof.
Background
With the long-term development of oil and gas resources and the further increase of the oil well depth in China, the oil field in China also faces the problems of reduced stratum permeability, reduced recovery ratio and the like. Fracturing has become increasingly important as an important measure for improving the productivity of oil fields, and common fracturing fluids include water-based fracturing fluids, oil-based fracturing fluids, emulsion fracturing fluids, foam fracturing fluids, acid-based fracturing fluids and the like; the water-based fracturing fluid is the most widely applied fracturing yield increasing mode at present because of the advantages of safety, environmental protection, convenient application and the like.
The thickener is an important additive in the water-based fracturing fluid, and the quality of the performance of the thickener directly determines the application effect of the water-based fracturing fluid; the thickening agent mainly plays a role in thickening and carrying sand in a fracturing fluid system, and can be divided into three major categories of natural galactomannans, celluloses and synthetic polymers according to the different chemical structures of the thickening agent; wherein, the synthetic polymer has wide application and good development prospect.
At present, a polyacrylamide synthetic polymer is a water-based fracturing fluid thickener with wider application; however, the polymer has the problems of slow crosslinking, large apparent viscosity after crosslinking, slow dissolution, slow gel breaking, high residue, low temperature resistance, salt resistance, low shearing resistance and the like.
Therefore, how to provide a thickener with instant dissolution, low apparent viscosity, fast gel breaking, low residue, excellent temperature resistance and shearing resistance and a preparation method thereof are problems to be solved by the person skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a water-based fracturing thickener and a preparation method thereof, which are used for solving the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a water-based fracturing thickener comprises the following components in parts by weight: 70-100 parts of water, 40-80 parts of 2-acrylamide-2-methylpropanesulfonate, 30-50 parts of N, N-dimethylacrylamide, 25-40 parts of sodium acrylate, 5-10 parts of octadecyl acrylate, 2-5 parts of dodecafluoroheptyl methacrylate, 0.01-0.1 part of complexing agent, 0.01-0.1 part of chain transfer agent and 0.01-0.1 part of initiator.
Preferably, the water-based fracturing thickener comprises the following components in parts by weight: 80-90 parts of water, 50-70 parts of 2-acrylamide-2-methylpropanesulfonate, 35-45 parts of N, N-dimethylacrylamide, 30-35 parts of sodium acrylate, 6-9 parts of octadecyl acrylate, 3-4 parts of dodecafluoroheptyl methacrylate, 0.01-0.1 part of complexing agent, 0.01-0.1 part of chain transfer agent and 0.01-0.1 part of initiator.
Preferably, the water-based fracturing thickener comprises the following components in parts by weight: 85 parts of water, 60 parts of 2-acrylamide-2-methylpropanesulfonate, 40 parts of N, N-dimethylacrylamide, 30 parts of sodium acrylate, 7 parts of octadecyl acrylate, 3 parts of dodecafluoroheptyl methacrylate, 0.05 part of complexing agent, 0.05 part of chain transfer agent and 0.05 part of initiator.
Among the components of the invention, the 2-acrylamide-2-methylpropanesulfonic acid sodium contains sulfonic acid groups, and has better temperature resistance and salt resistance; the octadecyl acrylate is a hydrophobic monomer, a hydrophobic functional group and an anti-salt functional group, so that the hydrophobic association of intermolecular hydrophobic groups is enhanced under the action of a cross-linking agent, and the formed cross-linking system has obvious tackifying property, salt resistance, shearing resistance and long-term stability.
Preferably, the complexing agent is disodium ethylenediamine tetraacetate.
Preferably, the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
The invention does not need to carry out purification treatment before reaction, and the complexing agent is added to initiate polymerization with the initiator under proper conditions, so the preparation process is simple.
Preferably, the chain transfer agent is sodium formate.
The invention also aims at providing a preparation method of the water-based fracturing thickener, which comprises the following steps:
(1) Mixing 2-acrylamide-2-methylpropanesulfonate with water, stirring and dissolving for 12-18min;
(2) Adding an alkaline regulator under stirring, adjusting the pH value of the solution in the step (2) to 6-7, and adjusting the temperature to 18-20 ℃;
(3) Adding N, N-dimethylacrylamide and dodecafluoroheptyl methacrylate into the solution obtained in the step (3), stirring and dissolving for 40-50min;
(4) Adding sodium acrylate, octadecyl acrylate, a complexing agent and a chain transfer agent into the solution obtained in the step (4), mixing, then introducing high-purity nitrogen, and deoxidizing for 40-50min;
(5) Under the protection of nitrogen, adding an initiator into the solution obtained in the step (5), and reacting for 4-8 hours to obtain colloid;
(6) Crushing, drying and granulating the colloid to obtain a thickener finished product.
The thickener can replace vegetable gum and derivatives thereof utilized in the existing fracturing construction, and has the advantages of shearing resistance, simple preparation process and the like.
Preferably, the alkaline regulator in step (2) is sodium hydroxide.
Compared with the prior art, the invention has the following beneficial effects:
1. the thickener prepared by the invention has good solubility and higher shearing resistance, and can be used as a substitute of field coke and guanidine gum;
2. the thickener provided by the invention is artificially synthesized, so that the thickener does not contain a large amount of water insoluble matters like vegetable gum, the thickener is completely dissolved in the fracturing fluid stock solution, the water insoluble matters are basically zero, the thickener does not contain solid phase components, the prepared fracturing fluid stock solution is transparent, the residue content after gum breaking is greatly reduced compared with a vegetable gum fracturing fluid system, and the thickener has the advantages of less residue content, low use viscosity, low cost, easiness in flowback and the like.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 100 parts of water, 40 parts of 2-acrylamide-2-methylpropanesulfonate, 50 parts of N, N-dimethylacrylamide, 40 parts of sodium acrylate, 5 parts of octadecyl acrylate, 2 parts of dodecafluoroheptyl methacrylate, 0.01 part of disodium ethylenediamine tetraacetate, 0.01 part of sodium formate and 0.1 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 2
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 70 parts of water, 60 parts of 2-acrylamide-2-methylpropanesulfonate, 35 parts of N, N-dimethylacrylamide, 30 parts of sodium acrylate, 8 parts of octadecyl acrylate, 4 parts of dodecafluoroheptyl methacrylate, 0.08 part of disodium ethylenediamine tetraacetate, 0.08 part of sodium formate and 0.05 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 3
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 90 parts of water, 65 parts of 2-acrylamide-2-methylpropanesulfonate, 35 parts of N, N-dimethylacrylamide, 35 parts of sodium acrylate, 9 parts of octadecyl acrylate, 3 parts of dodecafluoroheptyl methacrylate, 0.1 part of disodium ethylenediamine tetraacetate, 0.02 part of sodium formate and 0.08 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 4
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 80 parts of water, 55 parts of 2-acrylamide-2-methylpropanesulfonate, 37 parts of N, N-dimethylacrylamide, 33 parts of sodium acrylate, 7 parts of octadecyl acrylate, 4 parts of dodecafluoroheptyl methacrylate, 0.07 part of disodium ethylenediamine tetraacetate, 0.03 part of sodium formate and 0.06 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 5
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 85 parts of water, 60 parts of 2-acrylamide-2-methylpropanesulfonate, 40 parts of N, N-dimethylacrylamide, 30 parts of sodium acrylate, 7 parts of octadecyl acrylate, 3 parts of dodecafluoroheptyl methacrylate, 0.05 part of disodium ethylenediamine tetraacetate, 0.05 part of sodium formate and 0.05 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 6
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 85 parts of water, 80 parts of 2-acrylamide-2-methylpropanesulfonate, 30 parts of N, N-dimethylacrylamide, 25 parts of sodium acrylate, 10 parts of octadecyl acrylate, 5 parts of dodecafluoroheptyl methacrylate, 0.1 part of disodium ethylenediamine tetraacetate, 0.1 part of sodium formate and 0.01 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 7
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 85 parts of water, 50 parts of 2-acrylamide-2-methylpropanesulfonate, 45 parts of N, N-dimethylacrylamide, 30 parts of sodium acrylate, 6 parts of octadecyl acrylate, 4 parts of dodecafluoroheptyl methacrylate, 0.1 part of disodium ethylenediamine tetraacetate, 0.1 part of sodium formate and 0.01 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 8
The embodiment provides a water-based fracturing thickener which comprises the following components in parts by weight: 85 parts of water, 70 parts of 2-acrylamide-2-methylpropanesulfonate, 45 parts of N, N-dimethylacrylamide, 25 parts of sodium acrylate, 10 parts of octadecyl acrylate, 5 parts of dodecafluoroheptyl methacrylate, 0.1 part of disodium ethylenediamine tetraacetate, 0.1 part of sodium formate and 0.1 part of initiator;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3.
Example 9
The embodiment provides a preparation method of a water-based fracturing thickener, which comprises the following steps:
(1) Mixing 2-acrylamide-2-methylpropanesulfonate with water, stirring and dissolving for 18min;
(2) Adding sodium hydroxide under stirring, adjusting the pH value of the solution in the step (2) to 7, and adjusting the temperature to 18 ℃;
(3) Adding N, N-dimethylacrylamide and dodecafluoroheptyl methacrylate into the solution obtained in the step (3), stirring and dissolving for 50min;
(4) Adding sodium acrylate, octadecyl acrylate, disodium ethylenediamine tetraacetate and sodium formate into the solution obtained in the step (4), mixing, then introducing high-purity nitrogen, and deoxidizing for 50min;
(5) Under the protection of nitrogen, adding an initiator into the solution obtained in the step (5), and reacting for 8 hours to obtain colloid;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3;
(6) Crushing, drying and granulating the colloid to obtain a thickener finished product.
Example 10
The embodiment provides a preparation method of a water-based fracturing thickener, which comprises the following steps:
(1) Mixing 2-acrylamide-2-methylpropanesulfonate with water, stirring and dissolving for 12min;
(2) Adding sodium hydroxide under stirring, adjusting the pH value of the solution in the step (2) to 7, and adjusting the temperature to 20 ℃;
(3) Adding N, N-dimethylacrylamide and dodecafluoroheptyl methacrylate into the solution obtained in the step (3), stirring and dissolving for 45min;
(4) Adding sodium acrylate, octadecyl acrylate, disodium ethylenediamine tetraacetate and sodium formate into the solution obtained in the step (4), mixing, and then introducing high-purity nitrogen to deoxidize for 48min;
(5) Under the protection of nitrogen, adding an initiator into the solution obtained in the step (5), and reacting for 6 hours to obtain colloid;
wherein the initiator is a composite system of azodiisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the azodiisobutyronitrile to the ceric ammonium nitrate to the tetramethyl ethylenediamine is 10:3:3;
(6) Crushing, drying and granulating the colloid to obtain a thickener finished product.
Characterization of Performance
The products of examples 1-5 were prepared by the method of example 10 and compared with a single hydroxypropyl guar as a thickener to detect the performance of the application;
the viscosity, the viscosity release rate, the shear stability and the sand carrying property of the product are tested according to the Q/JRF135-2021 (thickener polymer for fracturing, JRYLZG) standard;
apparent viscosity of the product is tested according to the standard of Q/GWYL-TP14-2021 shale gas variable viscosity fracturing fluid technical protocol;
burning residues of the product are tested according to SY/T5107-2016 water-based fracturing fluid evaluation method standard;
gel breaking time of a product is tested according to Q/RFC0025-2020 (fracturing fluid thickener modified Polymer class FC-II) standard; the test results are shown in table 1:
as can be seen from the above table, the thickener prepared by the method of the invention has the advantages of quick dissolution, low apparent viscosity, quick gel breaking, low residue, and excellent temperature resistance and shearing resistance compared with the common hydroxypropyl guanidine gum.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The water-based fracturing thickener is characterized by comprising the following components in parts by weight: 70-100 parts of water, 40-80 parts of 2-acrylamide-2-methylpropanesulfonate, 30-50 parts of N, N-dimethylacrylamide, 25-40 parts of sodium acrylate, 5-10 parts of octadecyl acrylate, 2-5 parts of dodecafluoroheptyl methacrylate, 0.01-0.1 part of complexing agent, 0.01-0.1 part of chain transfer agent and 0.01-0.1 part of initiator.
2. The water-based fracturing thickener according to claim 1, which comprises the following components in parts by weight: 80-90 parts of water, 50-70 parts of 2-acrylamide-2-methylpropanesulfonate, 35-45 parts of N, N-dimethylacrylamide, 30-35 parts of sodium acrylate, 6-9 parts of octadecyl acrylate, 3-4 parts of dodecafluoroheptyl methacrylate, 0.01-0.1 part of complexing agent, 0.01-0.1 part of chain transfer agent and 0.01-0.1 part of initiator.
3. The water-based fracturing thickener according to claim 2, which comprises the following components in parts by weight: 85 parts of water, 60 parts of 2-acrylamide-2-methylpropanesulfonate, 40 parts of N, N-dimethylacrylamide, 30 parts of sodium acrylate, 7 parts of octadecyl acrylate, 3 parts of dodecafluoroheptyl methacrylate, 0.05 part of complexing agent, 0.05 part of chain transfer agent and 0.05 part of initiator.
4. A water-based fracturing thickener according to claim 3, wherein said complexing agent is disodium edetate.
5. The water-based fracturing thickener according to claim 4, wherein the initiator is a composite system of azobisisobutyronitrile, ceric ammonium nitrate and tetramethyl ethylenediamine, and the mass ratio of the three is 10:3:3.
6. The water-based fracturing thickener of claim 5, wherein said chain transfer agent is sodium formate.
7. The method for preparing the water-based fracturing thickener according to claim 6, comprising the following steps:
(1) Mixing 2-acrylamide-2-methylpropanesulfonate with water, stirring and dissolving for 12-18min;
(2) Adding an alkaline regulator under stirring, adjusting the pH value of the solution in the step (2) to 6-7, and adjusting the temperature to 18-20 ℃;
(3) Adding N, N-dimethylacrylamide and dodecafluoroheptyl methacrylate into the solution obtained in the step (3), stirring and dissolving for 40-50min;
(4) Adding sodium acrylate, octadecyl acrylate, a complexing agent and a chain transfer agent into the solution obtained in the step (4), mixing, then introducing high-purity nitrogen, and deoxidizing for 40-50min;
(5) Under the protection of nitrogen, adding an initiator into the solution obtained in the step (5), and reacting for 4-8 hours to obtain colloid;
(6) Crushing, drying and granulating the colloid to obtain a thickener finished product.
8. The method of claim 7, wherein the alkaline modifier in step (2) is sodium hydroxide.
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