CN111320723A - Self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum, preparation method thereof and application thereof in oil field - Google Patents
Self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum, preparation method thereof and application thereof in oil field Download PDFInfo
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- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 title claims abstract description 162
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 title claims abstract description 83
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229920002401 polyacrylamide Polymers 0.000 title claims abstract description 53
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 74
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000003756 stirring Methods 0.000 claims abstract description 37
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 36
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 claims abstract description 31
- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000012043 crude product Substances 0.000 claims abstract description 20
- 239000000839 emulsion Substances 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 18
- 229910021538 borax Inorganic materials 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 16
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 16
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 16
- TYLZPUBCHKTZOU-UHFFFAOYSA-N n-dodecan-2-ylprop-2-enamide;sodium Chemical compound [Na].CCCCCCCCCCC(C)NC(=O)C=C TYLZPUBCHKTZOU-UHFFFAOYSA-N 0.000 claims abstract description 15
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 15
- 239000003999 initiator Substances 0.000 claims abstract description 12
- 239000012188 paraffin wax Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 229960000541 cetyl alcohol Drugs 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 56
- 229920002907 Guar gum Polymers 0.000 claims description 49
- 239000000665 guar gum Substances 0.000 claims description 49
- 229960002154 guar gum Drugs 0.000 claims description 49
- 235000010417 guar gum Nutrition 0.000 claims description 49
- 239000000047 product Substances 0.000 claims description 26
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 11
- BGYBTGDDOPTJSB-UHFFFAOYSA-N acetic acid;ethane-1,2-diol Chemical compound CC(O)=O.OCCO BGYBTGDDOPTJSB-UHFFFAOYSA-N 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- -1 polyoxyethylene octyl phenol Polymers 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000004971 Cross linker Substances 0.000 claims 2
- XQPVIMDDIXCFFS-UHFFFAOYSA-N n-dodecylprop-2-enamide Chemical compound CCCCCCCCCCCCNC(=O)C=C XQPVIMDDIXCFFS-UHFFFAOYSA-N 0.000 abstract description 18
- 229920001577 copolymer Polymers 0.000 abstract description 10
- 239000003431 cross linking reagent Substances 0.000 abstract description 10
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 12
- 159000000000 sodium salts Chemical class 0.000 description 12
- 230000033558 biomineral tissue development Effects 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 description 7
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229920001519 homopolymer Polymers 0.000 description 7
- 238000010992 reflux Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000000967 suction filtration Methods 0.000 description 7
- 238000001291 vacuum drying Methods 0.000 description 7
- 238000005303 weighing Methods 0.000 description 7
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 6
- 229920001897 terpolymer Polymers 0.000 description 5
- 238000004945 emulsification Methods 0.000 description 4
- 125000000542 sulfonic acid group Chemical group 0.000 description 4
- 229920006322 acrylamide copolymer Polymers 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000015784 hyperosmotic salinity response Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- TUDGMESWIBQVBE-UHFFFAOYSA-N C(C=C)(=O)NC(C[Na])CCCCCCCCCC Chemical compound C(C=C)(=O)NC(C[Na])CCCCCCCCCC TUDGMESWIBQVBE-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- NGPZJQXXJCDBDS-UHFFFAOYSA-N dodecane-1-sulfonic acid;sodium Chemical compound [Na].CCCCCCCCCCCCS(O)(=O)=O NGPZJQXXJCDBDS-UHFFFAOYSA-N 0.000 description 1
- 230000000668 effect on calcium Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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- 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
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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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
- C09K8/62—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
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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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
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- 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
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum, a preparation method thereof and application thereof in oil fields, wherein the preparation method comprises the following steps: 1) mixing paraffin, compound emulsifier and cetyl alcohol to obtain an oil phase; adding guanidine gum to obtain inverse emulsion; 2) adding the inverse emulsion into an acrylamide solution, a 2-acrylamidododecane sodium sulfonate solution and an N-dodecyl acrylamide solution; 3) adding an initiator solution, stirring under the condition of introducing nitrogen, and stopping introducing a nitrogen sealing device for reaction; 4) after the reaction is finished, demulsifying with ethanol, filtering, washing and drying to obtain a crude product; 5) extracting the crude product; 6) adding a borax cross-linking agent into the grafted guanidine gum solution to prepare the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid. The invention improves the salt resistance of the guanidine gum fracturing fluid and improves the temperature resistance and salt resistance of the copolymer grafted guanidine gum fracturing fluid.
Description
Technical Field
The invention relates to the technical field of high-temperature high-salt well fracturing fluid, in particular to self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum, a preparation method thereof and application thereof in oil fields.
Background
The guanidine gum fracturing fluid is popularized and applied to most low-permeability oil reservoirs in China due to the fact that the guanidine gum fracturing fluid has sand-carrying and fracture-making capacity and flow conductivity of a reservoir layer higher than those of common fracturing fluids. However, the guanidine gum has the defects of poor temperature resistance, poor mineralization resistance, large residue content and the like. Therefore, the guanidine gum fracturing fluid which still has effective fracturing effect in high-temperature and high-salt wells has very important significance.
Disclosure of Invention
The invention aims to solve the defects that the guanidine gum fracturing fluid is not resistant to temperature and mineralization and provides self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum, a preparation method thereof and application thereof in oil fields. The invention improves the salt resistance of the guanidine gum fracturing fluid. Meanwhile, the copolymer grafted guanidine gum fracturing fluid has a hydrophobic chain, has a hydrophobic association effect, and generates association aggregates (physical crosslinking) at high temperature, so that the product has good temperature resistance, and the temperature resistance and salt tolerance of the copolymer grafted guanidine gum fracturing fluid are improved.
The technical scheme adopted by the invention is as follows:
a self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum has the following structural formula:
GG is a guanidine gum macromolecular chain, and the value range of n is 50-1000.
A preparation method of self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum comprises the following steps:
1) mixing paraffin, composite emulsifier and cetyl alcohol, heating and stirring to completely dissolve the cetyl alcohol to prepare an oil phase; slowly adding the guar gum aqueous solution into the oil phase under the stirring state, and continuously stirring to obtain the inverse emulsion of the guar gum;
2) adding an acrylamide solution, a 2-acrylamidododecane sodium sulfonate solution and an N-N-dodecyl acrylamide solution into the inverse emulsion, and continuously introducing nitrogen;
3) adding an initiator solution, stirring under the condition of introducing nitrogen, and stopping introducing a nitrogen sealing device for reaction;
4) after the reaction is finished, demulsifying with ethanol, filtering, washing and drying to obtain a crude product;
5) and extracting the crude product to obtain the product self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum.
As a further improvement of the invention, the mass ratio of the paraffin, the composite emulsifier and the hexadecanol in the step 1) is 100:10: 3.3.
As a further improvement of the invention, the composite emulsifier in the step 1) is obtained by compounding span 80 and polyoxyethylene octyl phenol ether-10, and the HLB value of the composite emulsifier is 6-8.
As a further improvement of the invention, the mass fraction of the cetyl alcohol added in the step 1) in the total mass of the oil phase is 2.0-4.0%;
preferably, the mass fraction of the guar gum aqueous solution added in the step 1) is 2.0-4.0%.
As a further improvement of the invention, the total mass ratio of the guanidine gum and the mixture of the acrylamide, the 2-acrylamidododecane sodium sulfonate and the N-N-dodecyl acrylamide added in the step 2) is 3 (1-3).
Preferably, the mass ratio of the acrylamide, the 2-acrylamidododecane sodium sulfonate and the N-N-dodecyl acrylamide in the step 2) is (3-5) to 1: 1.
As a further improvement of the method, in the step 3), the initiators are ammonium ceric nitrate with the concentration of 3-5 mmol/L and potassium persulfate solution with the concentration of 120-130 mg/L, and the nitrogen gas is introduced for 15-25 min;
preferably, the reaction temperature in the step 3) is 70-80 ℃, and the reaction time is 4-6 h.
As a further improvement of the invention, the ethanol in step 4) is 95% ethanol; the solvent for washing was 95% ethanol;
preferably, the solvent for said extraction in step 5) is: glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3: 2.
The preparation method of the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum is applied to oil fields, and the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum is used as a fracturing fluid of high-temperature and high-salinity wells of the oil fields, wherein the fracturing fluid comprises the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum and a borax cross-linking agent which are used simultaneously.
As a further improvement of the invention, a borax cross-linking agent is added into the grafted guanidine gum solution to prepare the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid;
as a further improvement of the invention, the use concentration of the solution for preparing the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum in the step 6) is 0.4-0.6%; the dosage of borax is 0.4-0.6% of the solution. The volume ratio of the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum solution to the borax solution is 100: 1.
Compared with the prior art, the invention has the following advantages:
aiming at the defect of poor salt resistance and temperature resistance of the existing guanidine gum fracturing fluid, the invention grafts the copolymer of acrylamide/2-acrylamido dodecyl sodium sulfonate/N-dodecyl acrylamide on the guanidine gum, the polymer has a fragment structure of the double-bond-containing 2-acrylamido dodecyl sodium sulfonate, so that the copolymer has a certain emulsification effect, the hydrophilic polyacrylamide and the hydrophobic N-dodecyl acrylamide can generate copolymerization reaction, and the copolymer is polymerized in the copolymer, and the AM/SADS/DMA terpolymer is grafted on the side chain of the guanidine gum under the self-emulsification condition. The guanidine gum molecule of the acrylamide/2-acrylamido dodecanesulfonic acid sodium salt/N-N-dodecyl acrylamide copolymer contains sulfonic acid groups, the sulfonic acid groups can improve calcium tolerance, and the guanidine gum has obvious scale inhibition effect on calcium phosphate, calcium carbonate and the like in water and excellent dispersion performance. The acrylamide/2-acrylamido dodecanesulfonic acid sodium salt/N-N-dodecyl acrylamide (AM/SADS/DMA) can be polymerized in the grafting process of the guar gum, so that the product is formed, wherein the guar gum has an AM/SADS/DMA copolymer on a side chain. The segment structure of the 2-acrylamide dodecane sulfonic acid sodium containing double bonds in the polymer has certain emulsification effect, so that the hydrophilic polyacrylamide and the hydrophobic N-N-dodecyl acrylamide can generate copolymerization reaction, and the hydrophilic polyacrylamide and the hydrophobic N-N-dodecyl acrylamide can be polymerized in the segment structure, and the AM/SADS/DMA terpolymer is grafted on the side chain of the guar gum under the self-emulsification condition. Due to the sulfonic acid group in the terpolymer, the AM/SADS/DMA terpolymer grafted guanidine gum can resist mineralization degree. The terpolymer has long-chain hydrophobic groups, so that association (physical crosslinking) occurs at a certain temperature and a certain mineralization degree, and the guanidine gum fracturing fluid obtained after grafting has a good fracturing effect in a high-temperature high-salt well. Improves the salt resistance of the guanidine gum fracturing fluid. Meanwhile, the copolymer grafted guanidine gum fracturing fluid has a hydrophobic chain, has a hydrophobic association effect, and generates association aggregates (physical crosslinking) at high temperature, so that the product has good temperature resistance, and the temperature resistance and salt tolerance of the copolymer grafted guanidine gum fracturing fluid are improved.
Drawings
FIG. 1 is a schematic representation of the free radical formation of guar gum;
FIG. 2 is a schematic diagram of the synthesis of self-emulsifying hydrophobic association type polyacrylamide grafted guar gum;
FIG. 3 is a graph showing the viscosity of the self-emulsifying hydrophobically associating type polyacrylamide grafted guar gum obtained in example 5 in comparison with the viscosity of the conventional guar gum at different temperatures;
FIG. 4 is a graph comparing the viscosity of the self-emulsifying hydrophobically associated polyacrylamide grafted guar gum obtained in example 5 with the viscosity of the conventional guar gum at different degrees of mineralization.
The specific implementation mode is as follows:
the technical solution in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The self-emulsifying hydrophobic association type polyacrylamide grafted guar gum has the following structural formula:
wherein GG is guanidine gum macromolecule, and the value range of n is 50 ~ 1000.
The specific preparation process is realized by the following reaction:
specifically, the preparation method and application of the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum comprise the following steps:
1) 100g of paraffin is added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 50-100 g of Guar Gum (GG) aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the guar gum reverse emulsion.
2) Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask into a water bath, opening and stirring, introducing nitrogen for 20min, weighing and adding 0.2-0.6 g of acrylamide solution (AM), 0.2-0.6 g of 2-acrylamidododecane sodium sulfonate (SADS) solution and 0.2-0.6 g N-n-dodecyl acrylamide solution (DMA) in sequence, and continuing introducing nitrogen for 20 min.
3) Adding 0.02g of prepared initiator solution respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting for 5-6 h at 75-85 ℃ by using a sealing device.
4) After the reaction is finished, ethanol with the volume fraction of 95% is used for demulsification and suction filtration, the obtained product is washed for 3 times by the ethanol, and the crude product is obtained by vacuum drying at the temperature of 60 ℃.
5) Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under the vacuum condition to obtain the product of acrylamide/2-acrylamido dodecane sulfonic acid sodium salt/N-N-dodecyl acrylamide (AM/SADS/DMA) grafted guanidine gum (ASD-GG).
6) Preparing self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum as high-temperature high-salt well fracturing fluid: adding a grafting guanidine gum (ASD-GG) solution with a certain concentration, and adding a borax cross-linking agent to prepare the self-emulsifying hydrophobic association type polyacrylamide grafting guanidine gum fracturing fluid.
The principle mainly comprises the following steps: guanidine gum in Ce4+The free radical is formed under the action of the N-methyl-guanidine gum, the generated free radical of the guanidine gum reacts with acrylamide, 2-acrylamidododecane sodium sulfonate and N-dodecyl acrylamide, and finally the guanidine gum is grafted. Forming acrylamide/2-acrylamido dodecanesulfonic acid sodium salt/N-dodecyl acrylamide copolymer on the side chain of guanidine gum. The acrylamide/2-acrylamido dodecanesulfonic acid sodium salt/N-N-dodecyl acrylamide copolymer structure contains sulfonic acid groups, so that the mineralization resistance of the grafted guanidine gum can be improved, and the grafted guanidine gum contains hydrophobic chains and has hydrophobic association effect, so that the grafted guanidine gum has high temperature resistance and mineralization resistance, and further has good viscosity in a high-temperature and high-salt environment.
The invention is further illustrated by the following specific examples and figures:
example 1
100g of paraffin is weighed and added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 50g of guar gum aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the inverse emulsion of the guar gum. Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask in a water bath, opening and stirring, introducing nitrogen for 20min, sequentially weighing 0.2g of acrylamide solution, 0.3g of 2-acrylamidododecane sodium sulfonate solution and 0.3g of N-n-dodecyl acrylamide solution, adding into the three-neck flask, and continuously introducing nitrogen for 20 min. Adding 0.02g of prepared initiator respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting at 75 ℃ in a sealing device. And finishing the reaction after 5h, demulsifying by using ethanol with the volume fraction of 95%, performing suction filtration, washing the obtained product by using ethanol for 3 times, and performing vacuum drying at 60 ℃ to obtain a crude product. Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under a vacuum condition to obtain the product of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-dodecyl acrylamide grafted guanidine gum. Preparing a solution of guanidine gum with the grafting concentration of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-N-dodecylacrylamide of 0.4 percent, adding a borax cross-linking agent with the concentration of 0.4 percent, and preparing according to the volume ratio of 100:1, wherein the solution is obtained from the emulsified hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid.
Example 2
100g of paraffin is weighed and added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 50g of guar gum aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the inverse emulsion of the guar gum. Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask into a water bath, opening the three-neck flask for stirring, introducing nitrogen for 20min, sequentially weighing 0.25g of acrylamide solution, 0.27g of 2-acrylamidododecane sodium sulfonate solution and 0.28g N-n-dodecyl acrylamide solution, adding into the three-neck flask, and continuously introducing nitrogen for 20 min. Adding 0.02g of prepared initiator respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting at 80 ℃ in a sealing device. And finishing the reaction after 5.5h, demulsifying by using ethanol with the volume fraction of 95%, performing suction filtration, washing the obtained product by using ethanol for 3 times, and performing vacuum drying at 60 ℃ to obtain a crude product. Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under a vacuum condition to obtain the product of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-dodecyl acrylamide grafted guanidine gum. Preparing a solution of guanidine gum with the grafting concentration of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-N-dodecylacrylamide of 0.6 percent, adding a borax cross-linking agent with the concentration of 0.4 percent, and preparing according to the volume ratio of 100:1, wherein the solution is obtained from the emulsified hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid.
Example 3
100g of paraffin is weighed and added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 50g of guar gum aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the inverse emulsion of the guar gum. Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask into a water bath, opening the three-neck flask for stirring, introducing nitrogen for 20min, sequentially weighing 0.3g of acrylamide solution, 0.25g of 2-acrylamidododecane sodium sulfonate solution and 0.25g N-n-dodecyl acrylamide solution, adding into the three-neck flask, and continuously introducing nitrogen for 20 min. Adding 0.02g of prepared initiator respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting at 85 ℃ in a sealing device. And finishing the reaction after 6h, demulsifying by using ethanol with the volume fraction of 95%, performing suction filtration, washing the obtained product by using ethanol for 3 times, and performing vacuum drying at 60 ℃ to obtain a crude product. Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under a vacuum condition to obtain the product of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-dodecyl acrylamide grafted guanidine gum. Preparing a solution of guanidine gum with the grafting concentration of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-N-dodecylacrylamide of 0.5 percent, adding a borax cross-linking agent with the concentration of 0.4 percent, and preparing according to the volume ratio of 100:1, wherein the solution is obtained from the emulsified hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid.
Example 4
100g of paraffin is weighed and added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 100g of guar gum aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the guar gum reverse emulsion. Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask into a water bath, opening the three-neck flask for stirring, introducing nitrogen for 20min, sequentially weighing 0.4g of acrylamide solution, 0.6g of 2-acrylamidododecane sodium sulfonate solution and 0.6g N-n-dodecyl acrylamide solution, adding into the three-neck flask, and continuously introducing nitrogen for 20 min. Adding 0.02g of prepared initiator respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting at 75 ℃ in a sealing device. And finishing the reaction after 6h, demulsifying by using ethanol with the volume fraction of 95%, performing suction filtration, washing the obtained product by using ethanol for 3 times, and performing vacuum drying at 60 ℃ to obtain a crude product. Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under a vacuum condition to obtain the product of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-dodecyl acrylamide grafted guanidine gum. Preparing a solution of guanidine gum with the grafting concentration of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-N-dodecylacrylamide of 0.6 percent, adding a borax cross-linking agent with the concentration of 0.4 percent, and preparing according to the volume ratio of 100:1, wherein the solution is obtained from the emulsified hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid.
Example 5
100g of paraffin is weighed and added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 100g of guar gum aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the guar gum reverse emulsion. Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask into a water bath, opening the three-neck flask for stirring, introducing nitrogen for 20min, sequentially weighing 0.5g of acrylamide solution, 0.6g of 2-acrylamidododecane sodium sulfonate solution and 0.5g N-n-dodecyl acrylamide solution, adding into the three-neck flask, and continuously introducing nitrogen for 20 min. Adding 0.02g of prepared initiator respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting at 80 ℃ in a sealing device. And finishing the reaction after 6h, demulsifying by using ethanol with the volume fraction of 95%, performing suction filtration, washing the obtained product by using ethanol for 3 times, and performing vacuum drying at 60 ℃ to obtain a crude product. Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under a vacuum condition to obtain the product of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-dodecyl acrylamide grafted guanidine gum. Preparing a solution of guanidine gum with the grafting concentration of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-N-dodecylacrylamide of 0.6 percent, adding a borax cross-linking agent with the concentration of 0.4 percent, and preparing according to the volume ratio of 100:1, wherein the solution is obtained from the emulsified hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid.
Example 6
100g of paraffin is weighed and added into a 250mL beaker, 10g of Span 80 (Span-80)/polyoxyethylene octyl phenol ether-10 (OP-10) composite emulsifier and 3.3g of hexadecanol are respectively added, and the mixture is heated and stirred to completely dissolve the hexadecanol so as to prepare an oil phase. Slowly adding 100g of guar gum aqueous solution with the mass fraction of 2.5% into the oil phase under the stirring state, and continuously stirring for a period of time to prepare the guar gum reverse emulsion. Transferring the inverse emulsion into a 250mL three-neck flask, putting the three-neck flask into a water bath, opening the three-neck flask for stirring, introducing nitrogen for 20min, sequentially weighing 0.6g of acrylamide solution, 0.5g of 2-acrylamidododecane sodium sulfonate solution and 0.5g N-n-dodecyl acrylamide solution, adding into the three-neck flask, and continuously introducing nitrogen for 20 min. Adding 0.02g of prepared initiator respectively, stirring under the condition of introducing nitrogen, stopping introducing nitrogen after 30min, and reacting at 80 ℃ in a sealing device. And finishing the reaction after 5.5h, demulsifying by using ethanol with the volume fraction of 95%, performing suction filtration, washing the obtained product by using ethanol for 3 times, and performing vacuum drying at 60 ℃ to obtain a crude product. Placing the crude product in a Soxhlet extractor, performing reflux extraction by using 100mL of glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3:2, filtering the solid by using a Buchner funnel, washing off a homopolymer by using ethanol, and drying the product under a vacuum condition to obtain the product of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-dodecyl acrylamide grafted guanidine gum. Preparing a solution of guanidine gum with the grafting concentration of acrylamide/2-acrylamidododecanesulfonic acid sodium salt/N-N-dodecylacrylamide of 0.5 percent, adding a borax cross-linking agent with the concentration of 0.4 percent, and preparing according to the volume ratio of 100:1, wherein the solution is obtained from the emulsified hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid.
Characterization and testing:
in order to characterize the performance of the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum, the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum synthesized in example 5 was subjected to viscosity tests at different temperatures and different degrees of mineralization, and the same test was performed on common guar gum under the same conditions. The results are shown in FIGS. 3 and 4.
As can be seen from FIG. 3, the viscosity of the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum at low temperature is not much different because the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum is hydrophilic at low temperature. And at higher temperature, the viscosity of the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum is obviously higher than that of the common guar gum. This is because the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum exhibits significant hydrophobicity due to the interaction of long chain alkyl groups under high temperature conditions, thereby increasing viscosity.
As can be seen from fig. 4, both decreased with increasing degree of mineralization, but the self-emulsifying hydrophobically associated polyacrylamide grafted guar decreased significantly more slowly and was significantly more viscous than the conventional guar at the same degree of mineralization. The reason is that the sulfonic group is successfully introduced into the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum, and the viscosity of the guanidine gum is greatly improved due to the existence of the sulfonic group.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the following claims.
Claims (10)
1. The self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum is characterized by having the following structural formula:
GG is a guanidine gum macromolecular chain, and the value range of n is 50-1000.
2. A preparation method of self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum is characterized by comprising the following steps:
1) mixing paraffin, composite emulsifier and cetyl alcohol, heating and stirring to completely dissolve the cetyl alcohol to prepare an oil phase; slowly adding the guar gum aqueous solution into the oil phase under the stirring state, and continuously stirring to obtain the inverse emulsion of the guar gum;
2) adding an acrylamide solution, a 2-acrylamidododecane sodium sulfonate solution and an N-N-dodecyl acrylamide solution into the inverse emulsion, and continuously introducing nitrogen;
3) adding an initiator solution, stirring under the condition of introducing nitrogen, and stopping introducing a nitrogen sealing device for reaction;
4) after the reaction is finished, demulsifying with ethanol, filtering, washing and drying to obtain a crude product;
5) and extracting the crude product to obtain the product self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum.
3. The method for preparing the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum as claimed in claim 2, wherein the mass ratio of the paraffin, the composite emulsifier and the hexadecanol in the step 1) is 100:10: 3.3.
4. The preparation method of the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum as claimed in claim 2, wherein the composite emulsifier in step 1) is prepared by compounding span 80 and polyoxyethylene octyl phenol ether-10, and the HLB value of the composite emulsifier is 6-8.
5. The preparation method of the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum as claimed in claim 2, wherein the mass fraction of the cetyl alcohol added in the step 1) to the total mass of the oil phase is 2.0-4.0%;
preferably, the mass fraction of the guar gum aqueous solution added in the step 1) is 2.0-4.0%.
6. The method for preparing the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum as claimed in claim 2, wherein the total mass ratio of the guanidine gum to the mixture of acrylamide, 2-acrylamidododecane sodium sulfonate and N-N-dodecylacrylamide added in the step 2) is 3 (1-3);
preferably, the mass ratio of the acrylamide, the 2-acrylamidododecane sodium sulfonate and the N-N-dodecyl acrylamide in the step 2) is (3-5) to 1: 1.
7. The preparation method of the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum as claimed in claim 2, wherein in the step 3), the initiator is ammonium ceric nitrate with the concentration of 3-5 mmol/L and potassium persulfate solution with the concentration of 120-130 mg/L, and the nitrogen gas is introduced for 15-25 min;
preferably, the reaction temperature in the step 3) is 70-80 ℃, and the reaction time is 4-6 h.
8. The method for preparing self-emulsifying hydrophobically associating polyacrylamide grafted guar gum as claimed in claim 2, wherein the ethanol in step 4) is 95% ethanol; the solvent for washing was 95% ethanol;
preferably, the solvent for said extraction in step 5) is: glacial acetic acid-ethylene glycol mixed solution with the volume ratio of 3: 2.
9. The use of the self-emulsifying hydrophobically associative polyacrylamide grafted guar gum of claim 1 in oil fields as a high temperature high salt well fracturing fluid for oil fields, the fracturing fluid comprising the simultaneous use of the self-emulsifying hydrophobically associative polyacrylamide grafted guar gum and a borax crosslinker.
10. The use of claim 9, wherein a borax crosslinker is added to the grafted guar gum solution to prepare a self-emulsifying hydrophobically-associated polyacrylamide grafted guar gum fracturing fluid;
preferably, the use concentration of the solution for preparing the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum is 0.4-0.6%; the borax dosage is 0.4-0.6% of the solution; the volume ratio of the self-emulsifying hydrophobic association type polyacrylamide grafted guar gum solution to the borax solution is 100: 1.
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