CN117736717B - Preparation method of oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing - Google Patents
Preparation method of oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing Download PDFInfo
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- 229920003169 water-soluble polymer Polymers 0.000 title claims abstract description 27
- 239000004815 dispersion polymer Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 48
- 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 42
- 229920000642 polymer Polymers 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 13
- 229920000896 Ethulose Polymers 0.000 claims abstract description 12
- 239000001859 Ethyl hydroxyethyl cellulose Substances 0.000 claims abstract description 12
- 235000019326 ethyl hydroxyethyl cellulose Nutrition 0.000 claims abstract description 12
- 229920001220 nitrocellulos Polymers 0.000 claims abstract description 12
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 12
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000001639 calcium acetate Substances 0.000 claims abstract description 11
- 235000011092 calcium acetate Nutrition 0.000 claims abstract description 11
- 229960005147 calcium acetate Drugs 0.000 claims abstract description 11
- PFKRTWCFCOUBHS-UHFFFAOYSA-N dimethyl(octadecyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[NH+](C)C PFKRTWCFCOUBHS-UHFFFAOYSA-N 0.000 claims abstract description 11
- 150000001298 alcohols Chemical class 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 72
- 238000005406 washing Methods 0.000 claims description 48
- 239000002904 solvent Substances 0.000 claims description 40
- 238000004090 dissolution Methods 0.000 claims description 32
- 238000001914 filtration Methods 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 31
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 28
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 28
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 22
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 20
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000003054 catalyst Substances 0.000 claims description 20
- -1 hydroxyl modified acrylamide Chemical class 0.000 claims description 20
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 claims description 20
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 20
- 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 18
- 239000003999 initiator Substances 0.000 claims description 18
- 238000006116 polymerization reaction Methods 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 16
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 16
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 239000013067 intermediate product Substances 0.000 claims description 12
- KJJPLEZQSCZCKE-UHFFFAOYSA-N 2-aminopropane-1,3-diol Chemical compound OCC(N)CO KJJPLEZQSCZCKE-UHFFFAOYSA-N 0.000 claims description 10
- 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 claims description 10
- DCPMPXBYPZGNDC-UHFFFAOYSA-N hydron;methanediimine;chloride Chemical compound Cl.N=C=N DCPMPXBYPZGNDC-UHFFFAOYSA-N 0.000 claims description 10
- 239000003112 inhibitor Substances 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 claims description 9
- 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 description 8
- MPNXSZJPSVBLHP-UHFFFAOYSA-N 2-chloro-n-phenylpyridine-3-carboxamide Chemical compound ClC1=NC=CC=C1C(=O)NC1=CC=CC=C1 MPNXSZJPSVBLHP-UHFFFAOYSA-N 0.000 claims description 8
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 8
- 238000007112 amidation reaction Methods 0.000 claims description 8
- 238000004821 distillation Methods 0.000 claims description 8
- 239000012153 distilled water Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 235000010344 sodium nitrate Nutrition 0.000 claims description 8
- 239000004317 sodium nitrate Substances 0.000 claims description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 2
- 239000012071 phase Substances 0.000 abstract description 15
- 150000003839 salts Chemical class 0.000 abstract description 7
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
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- 238000000605 extraction Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 150000003242 quaternary ammonium salts Chemical group 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 125000000542 sulfonic acid group Chemical group 0.000 description 2
- 150000003926 acrylamides Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
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Abstract
The invention relates to the technical field of oil and gas well fracturing, and discloses a preparation method of an oil-free phase water-soluble polymer dispersion system for oil and gas well fracturing, which comprises the following steps: mixing 20-30g of water-soluble alcohols, 25-50g of polyacrylamide powder, 5-10g of dispersing agent, 1-2g of calcium acetate, 2-4g of octadecyl dimethyl ammonium chloride, 2-3g of nitrocotton, 1-2g of ethyl hydroxyethyl cellulose, 2-5g of acrylic acid high-carbon lipid polymer and 20-40g of water, and stirring for 40-70min to obtain an oil-free phase water-soluble polymer dispersion system for fracturing oil and gas wells; the oil-free phase water-soluble polymer dispersion system polymer powder for oil-gas well fracturing is uniformly dispersed in liquid phase alcohols, maintains stable and uniform suspension, does not delaminate, and has better salt resistance and high drag reduction performance.
Description
Technical Field
The invention relates to the technical field of oil and gas well fracturing, in particular to a preparation method of an oil-free phase water-soluble polymer dispersion system for oil and gas well fracturing.
Background
In the middle and later stages of oil and gas field development, the depth of an oil well is continuously increased, and the stratum temperature of part of high-temperature wells is close to or exceeds 200 ℃, so that difficulties are brought to unconventional technologies such as hydraulic fracturing and the like. Meanwhile, the mineralization degree of deep well stratum water is high, after the mineralization degree acts with anions of a polymer molecular side chain of the thickening agent, the polymer molecular chain which is rigidly stretched is curled and collapsed, so that the viscosity, sand carrying capacity, sand suspending capacity and the like of the thickening agent polymer for fracturing are greatly attenuated, the yield increasing effect is reduced, and the oil extraction cost is obviously improved. In addition, oil and gas wells such as shale gas and sandstone gas are more and more, offshore oil fields develop rapidly, and the use proportion of unconventional oil extraction technologies such as hydraulic fracturing is larger and larger. The thickener is directly prepared into high-performance fracturing fluid with hypersalinity water of oil and gas well flowback or in-situ seawater, which is beneficial to saving a large amount of fresh water resources, improving efficiency and achieving the purpose of oil and gas yield increase and efficiency improvement, for example, the literature on synthesis of acrylic acid higher alcohol ester reports a method for synthesizing acrylic acid higher alcohol ester which is a pour point depressant intermediate and separating and purifying a product, the acrylic acid higher alcohol ester is a common intermediate of a fluidity improver, and the steric hindrance can be changed by changing the chain length of higher alcohol, so that the pour point depressant and crude oil can interact better.
Disclosure of Invention
(One) solving the technical problems
Aiming at the defects of the prior art, the invention provides a preparation method of an oil-free water-soluble polymer dispersion system for oil-gas well fracturing, which has the advantages of better temperature resistance, salt resistance, high drag reduction, cleanness, no residue, no damage to oil-gas layers and the like.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for preparing an oil-free phase water-soluble polymer dispersion system for oil and gas well fracturing, which comprises the following steps: mixing 20-30g of water-soluble alcohols, 25-50g of polyacrylamide powder, 5-10g of dispersing agent, 1-2g of calcium acetate, 2-4g of octadecyl dimethyl ammonium chloride, 2-3g of nitrocotton, 1-2g of ethyl hydroxyethyl cellulose, 2-5g of acrylic acid high-carbon lipid polymer and 20-40g of water, and stirring for 40-70min to obtain the oil-free phase water-soluble polymer dispersion system for fracturing oil and gas wells.
Preferably, the water-soluble alcohol is any one or more of methanol, ethanol, ethylene glycol, polyethylene glycol, propanol, propylene glycol, glycerol and diethylene glycol.
Preferably, the preparation of the dispersing agent comprises the following steps:
(1) Adding acrylamide and maleic anhydride into N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 3-6h at 30-50 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding maleic anhydride grafted acrylamide into an N, N-dimethylformamide solvent for dissolution, adding 2-amino-1, 3-propanediol and a 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding carbodiimide hydrochloride, reacting for 2-4 hours at 20-30 ℃, distilling under reduced pressure to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 1-2g of hydroxyl modified acrylamide and 2.1-3.2g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.3-1.5g of acrylic acid monomer and 0.11-0.24g of azodiisobutyronitrile initiator, carrying out water bath for 3-6h at 80-120 ℃, and carrying out reduced pressure distillation, washing, filtering and drying after the reaction to obtain the dispersing agent.
Preferably, the mass ratio of the acrylamide to the maleic anhydride in the step (1) is 1.2-1.3:1.
Preferably, the mass ratio of the maleic anhydride grafted acrylamide, the 2-amino-1, 3-propylene glycol, the 4-dimethylaminopyridine catalyst and the carbodiimide hydrochloride in the (2) is 1.1-1.3:1:0.01-0.03:0.2-0.4.
Preferably, the preparation method of the acrylic high-carbon lipid polymer comprises the following steps:
(1) Adding stearyl alcohol and hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 40-60 ℃, then continuously adding acrylic acid and p-toluenesulfonic acid catalyst, reacting for 4-8 hours at 80-90 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(2) Adding an intermediate product A and 2-acrylamide-2-methylpropanesulfonic acid sodium into an N, N-dimethylformamide solvent for dissolution, then adding an azodiisobutyronitrile initiator for polymerization reaction, and reacting for 10-12h at 60-100 ℃ to obtain the acrylic acid high-carbon-fat polymer.
Preferably, the mass ratio of the octadecanol to the hydroquinone polymerization inhibitor to the acrylic acid to the p-toluenesulfonic acid catalyst is 1.2-1.6:0.1-0.3:1:0.01-0.02.
Preferably, the mass ratio of the intermediate product A to the sodium 2-acrylamide-2-methylpropanesulfonate to the azodiisobutyronitrile initiator is 1.3-1.5:1:0.03-0.05.
(III) beneficial technical effects
According to the invention, the oil-free phase water-soluble polymer dispersion system for oil and gas well fracturing is obtained by mixing and stirring water-soluble alcohols, polyacrylamide powder, a dispersing agent, calcium acetate, octadecyl dimethyl ammonium chloride, nitrocotton, ethyl hydroxyethyl cellulose, acrylic acid high-carbon lipid polymer and water.
The dispersing agent provided by the invention contains a large number of quaternary ammonium salt groups and hydroxyl groups, has better compatibility with an oil-free phase water-soluble polymer dispersing system for oil-gas well fracturing, and contains nitrogen-hydrogen bonds which can form hydrogen bonds with water-soluble alcohols and other raw materials, so that polyacrylamide powder, nitrocotton, ethylhydroxyethyl cellulose and acrylic acid high-carbon lipid polymers are uniformly dispersed in liquid-phase alcohols, and stable and uniform suspension is maintained without layering; the quaternary ammonium salt has good water solubility and high positive charge density, so that the polymer molecular chain keeps good extensibility in water, and the positive functional group provides stable cation adsorption functional group and improves the temperature resistance and salt resistance.
The acrylic acid high-carbon lipid polymer can change the chain length of high-carbon alcohol and can change the steric hindrance, so that an oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing and crude oil can better interact, sulfonic acid groups contained in the acrylic acid high-carbon lipid polymer have strong hydrophilicity, thicker hydration films are formed around polymer molecules, good water solubility and extensibility of polymer molecular chains are maintained, the sulfonic acid groups have small hydrophilic influence by pH, the polymer can still play a role when the pH is low, the strong hydration effect and electrostatic repulsion increase the intermolecular hydrodynamic volume, and the salt resistance of the polymer is also improved.
Drawings
FIG. 1 is a reaction scheme for hydroxy modified acrylamides.
FIG. 2 is a reaction scheme for acrylic high carbon lipid polymers.
Detailed Description
Example 1
(1) Adding 1.2g of acrylamide and 1g of maleic anhydride into an N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 3 hours at 30 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding 1.1g of maleic anhydride grafted acrylamide into an N, N-dimethylformamide solvent for dissolution, adding 1g of 2-amino-1, 3-propanediol and 0.01g of 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding 0.2g of carbodiimide hydrochloride, reacting for 2 hours at 20 ℃, decompressing and distilling to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 1g of hydroxyl modified acrylamide and 2.1g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.3g of acrylic acid monomer and 0.11g of azodiisobutyronitrile initiator, carrying out water bath at 80 ℃ for 3 hours, and carrying out reduced pressure distillation, washing, filtering and drying after the reaction to obtain a dispersing agent;
(4) Adding 1.2g of stearyl alcohol and 0.1g of hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 40 ℃, then continuously adding 1g of acrylic acid and 0.01g of p-toluenesulfonic acid catalyst, reacting for 4 hours at 80 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(5) Adding 1.3g of intermediate A and 1g of 2-acrylamide-2-methylpropanesulfonic acid sodium into N, N-dimethylformamide solvent for dissolution, then adding 0.03g of azodiisobutyronitrile initiator for polymerization reaction, and reacting for 10 hours at 60 ℃ to obtain an acrylic acid high-carbon-fat polymer;
(6) Mixing 20g of methanol, 25g of polyacrylamide powder, 5g of dispersing agent, 1g of calcium acetate, 2g of octadecyl dimethyl ammonium chloride, 2g of nitrocotton, 1g of ethyl hydroxyethyl cellulose, 2g of acrylic high-carbon lipid polymer and 20g of water, and stirring for 40min to obtain the oil-free water-soluble polymer dispersion system for oil-gas well fracturing.
Example 2
(1) Adding 3.9g of acrylamide and 3g of maleic anhydride into an N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 6 hours at 50 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding 2.6g of maleic anhydride grafted acrylamide into N, N-dimethylformamide solvent for dissolution, adding 2g of 2-amino-1, 3-propanediol and 0.06g of 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding 0.8g of carbodiimide hydrochloride, reacting for 4 hours at 30 ℃, decompressing and distilling to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 2g of hydroxyl modified acrylamide and 3.2g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.5g of acrylic acid monomer and 0.24g of azodiisobutyronitrile initiator, carrying out water bath at 120 ℃ for 6 hours, and carrying out reduced pressure distillation, washing, filtering and drying after the reaction to obtain a dispersing agent;
(4) Adding 3.2g of stearyl alcohol and 0.6g of hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 60 ℃, then continuously adding 2g of acrylic acid and 0.04g of p-toluenesulfonic acid catalyst for reaction for 8 hours at 90 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(5) Adding 3g of intermediate A and 2g of 2-acrylamide-2-methylpropanesulfonic acid sodium into N, N-dimethylformamide solvent for dissolution, then adding 0.1g of azodiisobutyronitrile initiator for polymerization reaction, and reacting for 12 hours at 100 ℃ to obtain an acrylic acid high-carbon-fat polymer;
(6) 30g of propylene glycol, 50g of polyacrylamide powder, 10g of dispersing agent, 2g of calcium acetate, 4g of octadecyl dimethyl ammonium chloride, 3g of nitrocotton, 2g of ethyl hydroxyethyl cellulose, 5g of acrylic high-carbon lipid polymer and 40g of water are mixed and stirred for 70min to obtain the oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing.
Example 3
(1) Adding 2.55g of acrylamide and 2g of maleic anhydride into an N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 4.5 hours at 40 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding 1.85g of maleic anhydride grafted acrylamide into N, N-dimethylformamide solvent for dissolution, adding 1.5g of 2-amino-1, 3-propanediol and 0.035g of 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding 0.5g of carbodiimide hydrochloride, reacting for 3 hours at 25 ℃, distilling under reduced pressure to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 1.5g of hydroxyl modified acrylamide and 2.65g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.4g of acrylic acid monomer and 0.175g of azodiisobutyronitrile initiator, carrying out water bath for 4.5 hours at 100 ℃, and carrying out reduced pressure distillation, washing, filtering and drying after reaction to obtain a dispersing agent;
(4) Adding 2.2g of stearyl alcohol and 0.35g of hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 50 ℃, then continuously adding 1.5g of acrylic acid and 0.025g of p-toluenesulfonic acid catalyst for reaction for 6 hours at 85 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(5) Adding 2.15g of intermediate A and 1.5g of 2-acrylamide-2-methylpropanesulfonic acid sodium into N, N-dimethylformamide solvent for dissolution, then adding 0.065g of azodiisobutyronitrile initiator for polymerization reaction, and reacting for 11 hours at 80 ℃ to obtain an acrylic acid high-carbon-fat polymer;
(6) 25g of ethylene glycol, 37.5g of polyacrylamide powder, 7.5g of dispersing agent, 1.5g of calcium acetate, 3g of octadecyl dimethyl ammonium chloride, 2.5g of nitrocotton, 1.5g of ethyl hydroxyethyl cellulose, 3.5g of acrylic acid high-carbon grease polymer and 30g of water are mixed and stirred for 55min to obtain an oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing.
Example 4
(1) Adding 1.2g of acrylamide and 1g of maleic anhydride into an N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 3 hours at 30 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding 1.1g of maleic anhydride grafted acrylamide into an N, N-dimethylformamide solvent for dissolution, adding 1g of 2-amino-1, 3-propanediol and 0.01g of 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding 0.2g of carbodiimide hydrochloride, reacting for 2 hours at 20 ℃, decompressing and distilling to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 2g of hydroxyl modified acrylamide and 3.2g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.5g of acrylic acid monomer and 0.24g of azodiisobutyronitrile initiator, carrying out water bath at 120 ℃ for 6 hours, and carrying out reduced pressure distillation, washing, filtering and drying after the reaction to obtain a dispersing agent;
(4) Adding 3.2g of stearyl alcohol and 0.6g of hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 60 ℃, then continuously adding 2g of acrylic acid and 0.04g of p-toluenesulfonic acid catalyst for reaction for 8 hours at 90 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(5) Adding 2.15g of intermediate A and 1.5g of 2-acrylamide-2-methylpropanesulfonic acid sodium into N, N-dimethylformamide solvent for dissolution, then adding 0.065g of azodiisobutyronitrile initiator for polymerization reaction, and reacting for 11 hours at 80 ℃ to obtain an acrylic acid high-carbon-fat polymer;
(6) 25g of ethylene glycol, 37.5g of polyacrylamide powder, 7.5g of dispersing agent, 1.5g of calcium acetate, 3g of octadecyl dimethyl ammonium chloride, 2.5g of nitrocotton, 1.5g of ethyl hydroxyethyl cellulose, 3.5g of acrylic acid high-carbon grease polymer and 30g of water are mixed and stirred for 55min to obtain an oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing.
Example 5
(1) Adding 3.9g of acrylamide and 3g of maleic anhydride into an N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 6 hours at 50 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding 2.6g of maleic anhydride grafted acrylamide into N, N-dimethylformamide solvent for dissolution, adding 2g of 2-amino-1, 3-propanediol and 0.06g of 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding 0.8g of carbodiimide hydrochloride, reacting for 4 hours at 30 ℃, decompressing and distilling to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 1.5g of hydroxyl modified acrylamide and 2.65g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.4g of acrylic acid monomer and 0.175g of azodiisobutyronitrile initiator, carrying out water bath for 4.5 hours at 100 ℃, and carrying out reduced pressure distillation, washing, filtering and drying after reaction to obtain a dispersing agent;
(4) Adding 2.2g of stearyl alcohol and 0.35g of hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 50 ℃, then continuously adding 1.5g of acrylic acid and 0.025g of p-toluenesulfonic acid catalyst for reaction for 6 hours at 85 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(5) Adding 1.3g of intermediate A and 1g of 2-acrylamide-2-methylpropanesulfonic acid sodium into N, N-dimethylformamide solvent for dissolution, then adding 0.03g of azodiisobutyronitrile initiator for polymerization reaction, and reacting for 10 hours at 60 ℃ to obtain an acrylic acid high-carbon-fat polymer;
(6) Mixing 20g of methanol, 25g of polyacrylamide powder, 5g of dispersing agent, 1g of calcium acetate, 2g of octadecyl dimethyl ammonium chloride, 2g of nitrocotton, 1g of ethyl hydroxyethyl cellulose, 2g of acrylic high-carbon lipid polymer and 20g of water, and stirring for 40min to obtain the oil-free water-soluble polymer dispersion system for oil-gas well fracturing.
Example 6
(1) Adding 2.55g of acrylamide and 2g of maleic anhydride into an N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 4.5 hours at 40 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding 1.85g of maleic anhydride grafted acrylamide into N, N-dimethylformamide solvent for dissolution, adding 1.5g of 2-amino-1, 3-propanediol and 0.035g of 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding 0.5g of carbodiimide hydrochloride, reacting for 3 hours at 25 ℃, distilling under reduced pressure to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 1g of hydroxyl modified acrylamide and 2.1g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.3g of acrylic acid monomer and 0.11g of azodiisobutyronitrile initiator, carrying out water bath at 80 ℃ for 3 hours, and carrying out reduced pressure distillation, washing, filtering and drying after the reaction to obtain a dispersing agent;
(4) Adding 1.2g of stearyl alcohol and 0.1g of hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 40 ℃, then continuously adding 1g of acrylic acid and 0.01g of p-toluenesulfonic acid catalyst, reacting for 4 hours at 80 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(5) Adding 1.3g of intermediate A and 1g of 2-acrylamide-2-methylpropanesulfonic acid sodium into N, N-dimethylformamide solvent for dissolution, then adding 0.03g of azodiisobutyronitrile initiator for polymerization reaction, and reacting for 10 hours at 60 ℃ to obtain an acrylic acid high-carbon-fat polymer;
(6) 30g of propylene glycol, 50g of polyacrylamide powder, 10g of dispersing agent, 2g of calcium acetate, 4g of octadecyl dimethyl ammonium chloride, 3g of nitrocotton, 2g of ethyl hydroxyethyl cellulose, 5g of acrylic high-carbon lipid polymer and 40g of water are mixed and stirred for 70min to obtain the oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing.
Comparative example 1
(1) 30G of propylene glycol, 26g of polyacrylamide powder, 2g of calcium acetate, 4g of octadecyl dimethyl ammonium chloride, 3g of nitrocotton, 2g of ethyl hydroxyethyl cellulose, 5g of acrylic acid high-carbon lipid polymer and 40g of water are mixed and stirred for 70min to obtain an oil-free water-soluble polymer dispersion system for oil-gas well fracturing.
Salt resistance tests were performed with examples 1 to 6 and comparative example 1, and the test results are shown in Table 1.
| Project | Salt resistance (%) |
| Example 1 | 95 |
| Example 2 | 93 |
| Example 3 | 96 |
| Example 4 | 92 |
| Example 5 | 94 |
| Example 6 | 91 |
| Comparative example 1 | 81 |
As shown in Table 1, the salt resistance of the oil-free phase water-soluble polymer dispersion system for oil-gas well fracturing of the invention reaches 91-96%.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. A method for preparing an oil-free phase water-soluble polymer dispersion system for oil and gas well fracturing, which is characterized by comprising the following steps: mixing 20-30g of water-soluble alcohols, 25-50g of polyacrylamide powder, 5-10g of dispersing agent, 1-2g of calcium acetate, 2-4g of octadecyl dimethyl ammonium chloride, 2-3g of nitrocotton, 1-2g of ethyl hydroxyethyl cellulose, 2-5g of acrylic acid high-carbon lipid polymer and 20-40g of water, and stirring for 40-70min to obtain an oil-free phase water-soluble polymer dispersion system for fracturing oil and gas wells;
the preparation of the dispersing agent comprises the following steps:
(1) Adding acrylamide and maleic anhydride into N, N-dimethylformamide solvent, carrying out amidation reaction, reacting for 3-6h at 30-50 ℃, filtering the solvent, and then washing with distilled water and ethanol in sequence to obtain maleic anhydride grafted acrylamide;
(2) Adding maleic anhydride grafted acrylamide into an N, N-dimethylformamide solvent for dissolution, adding 2-amino-1, 3-propanediol and a 4-dimethylaminopyridine catalyst after dissolution, stirring and slowly dropwise adding carbodiimide hydrochloride, reacting for 2-4 hours at 20-30 ℃, distilling under reduced pressure to remove the solvent after the reaction, filtering, washing and drying to obtain hydroxyl modified acrylamide;
(3) Adding 1-2g of hydroxyl modified acrylamide and 2.1-3.2g of (3-acrylamide) trimethyl ammonium chloride into a reactor, introducing nitrogen for protection, adding 1.3-1.5g of acrylic acid monomer and 0.11-0.24g of azodiisobutyronitrile initiator, carrying out water bath for 3-6 hours at 80-120 ℃, and carrying out reduced pressure distillation, washing, filtering and drying after reaction to obtain a dispersing agent;
The preparation method of the acrylic acid high-carbon lipid polymer comprises the following steps:
(1) Adding stearyl alcohol and hydroquinone polymerization inhibitor into cyclohexane for dissolution, stirring and heating to 40-60 ℃, then continuously adding acrylic acid and p-toluenesulfonic acid catalyst, reacting for 4-8 hours at 80-90 ℃, washing with sodium nitrate, washing with sodium carbonate to be alkaline, washing with protective sodium chloride, and filtering to obtain an intermediate product A;
(2) Adding an intermediate product A and 2-acrylamide-2-methylpropanesulfonic acid sodium into an N, N-dimethylformamide solvent for dissolution, then adding an azodiisobutyronitrile initiator for polymerization reaction, and reacting for 10-12h at 60-100 ℃ to obtain the acrylic acid high-carbon-fat polymer.
2. The method for preparing an oil-free water-soluble polymer dispersion system for oil-gas well fracturing according to claim 1, wherein the water-soluble alcohol is any one or more of methanol, ethanol, ethylene glycol, polyethylene glycol, propanol, propylene glycol, glycerol and diethylene glycol.
3. The method for preparing an oil-free water-soluble polymer dispersion for oil and gas well fracturing according to claim 1, wherein the mass ratio of acrylamide to maleic anhydride in (1) is 1.2-1.3:1.
4. The method for preparing an oil-free water-soluble polymer dispersion system for oil and gas well fracturing according to claim 1, wherein the mass ratio of maleic anhydride grafted acrylamide, 2-amino-1, 3-propanediol, 4-dimethylaminopyridine catalyst and carbodiimide hydrochloride in (2) is 1.1-1.3:1:0.01-0.03:0.2-0.4.
5. The method for preparing an oil-free water-soluble polymer dispersion system for oil-gas well fracturing according to claim 1, wherein the mass ratio of stearyl alcohol, hydroquinone polymerization inhibitor, acrylic acid and p-toluenesulfonic acid catalyst in the method for preparing the acrylic acid high-carbon lipid polymer is 1.2-1.6:0.1-0.3:1:0.01-0.02.
6. The method for preparing an oil-free water-soluble polymer dispersion system for oil and gas well fracturing according to claim 1, wherein the mass ratio of an intermediate product A to sodium 2-acrylamide-2-methylpropanesulfonate to an azodiisobutyronitrile initiator in the preparation method of the acrylic acid high-carbon lipid polymer is 1.3-1.5:1:0.03-0.05.
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