CN116948092A - Multifunctional viscosity-changing slick water fracturing fluid additive, preparation method and application thereof - Google Patents
Multifunctional viscosity-changing slick water fracturing fluid additive, preparation method and application thereof Download PDFInfo
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- CN116948092A CN116948092A CN202210389032.XA CN202210389032A CN116948092A CN 116948092 A CN116948092 A CN 116948092A CN 202210389032 A CN202210389032 A CN 202210389032A CN 116948092 A CN116948092 A CN 116948092A
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- 239000012530 fluid Substances 0.000 title claims abstract description 100
- 239000000654 additive Substances 0.000 title claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 230000000996 additive effect Effects 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 230000002579 anti-swelling effect Effects 0.000 claims abstract description 42
- 239000004094 surface-active agent Substances 0.000 claims abstract description 38
- -1 ammonium ions Chemical class 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 51
- 239000002245 particle Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 28
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 28
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 28
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 18
- 239000000178 monomer Substances 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 16
- 239000005457 ice water Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 12
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 11
- 229920002554 vinyl polymer Polymers 0.000 claims description 11
- 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 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 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 9
- 238000004945 emulsification Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- YPJUNDFVDDCYIH-UHFFFAOYSA-N perfluorobutyric acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)F YPJUNDFVDDCYIH-UHFFFAOYSA-N 0.000 claims description 9
- 229920000136 polysorbate Polymers 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- LWZFANDGMFTDAV-BURFUSLBSA-N [(2r)-2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O LWZFANDGMFTDAV-BURFUSLBSA-N 0.000 claims description 7
- 150000002191 fatty alcohols Chemical class 0.000 claims description 7
- 229920001289 polyvinyl ether Polymers 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 7
- 235000011067 sorbitan monolaureate Nutrition 0.000 claims description 7
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 230000000379 polymerizing effect Effects 0.000 claims description 6
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 6
- 229920000053 polysorbate 80 Polymers 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 5
- RFIMISVNSAUMBU-UHFFFAOYSA-N 2-(hydroxymethyl)-2-(prop-2-enoxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC=C RFIMISVNSAUMBU-UHFFFAOYSA-N 0.000 claims description 4
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- FSAJWMJJORKPKS-UHFFFAOYSA-N octadecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C=C FSAJWMJJORKPKS-UHFFFAOYSA-N 0.000 claims description 4
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 4
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000012673 precipitation polymerization Methods 0.000 claims description 3
- 238000000967 suction filtration Methods 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 230000001804 emulsifying effect Effects 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 abstract description 3
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 30
- 230000001276 controlling effect Effects 0.000 description 20
- 238000006386 neutralization reaction Methods 0.000 description 15
- 238000010276 construction Methods 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 7
- 229910021641 deionized water Inorganic materials 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000008399 tap water Substances 0.000 description 7
- 235000020679 tap water Nutrition 0.000 description 7
- 238000005303 weighing Methods 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 239000004927 clay Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000012688 inverse emulsion polymerization Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 230000033558 biomineral tissue development Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000003075 superhydrophobic effect Effects 0.000 description 3
- UWNADWZGEHDQAB-UHFFFAOYSA-N 2,5-dimethylhexane Chemical group CC(C)CCC(C)C UWNADWZGEHDQAB-UHFFFAOYSA-N 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000665 guar gum Substances 0.000 description 2
- 229960002154 guar gum Drugs 0.000 description 2
- 235000010417 guar gum Nutrition 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 208000033830 Hot Flashes Diseases 0.000 description 1
- 206010060800 Hot flush Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229940092782 bentonite Drugs 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a single or double bond to nitrogen
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- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
- C09K8/604—Polymeric surfactants
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- 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
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polymerisation Methods In General (AREA)
Abstract
The application discloses a multifunctional variable-viscosity slick water fracturing fluid additive, a preparation method and application thereof, relates to the technical field of slick water fracturing, and solves the technical problem that the conventional fracturing fluid additive is difficult to realize multifunction by simple compounding. The application has the anti-swelling performance, and provides good anti-swelling performance by coordinating and synergy with ammonium ions in the water phase; the dosage of the common hydrocarbon surfactant is reduced, and the gel-breaking liquid has good surface interfacial activity under reasonable dosage, so that the gel-breaking liquid has lower surface interfacial tension.
Description
Technical Field
The application relates to the technical field of oilfield exploitation, in particular to the technical field of slick water fracturing.
Background
With the lifting of hot flashes generated in unconventional oil and gas resource exploitation, volume fracturing has become an effective measure for compact oil transformation, and the slick water fracturing technology is beneficial to communication of microcracks. The technology has higher general construction discharge capacity, and the drag reducer in the slickwater fracturing fluid in construction operation has better friction resistance reducing performance to better reduce the construction pressure, meet the requirement of large-discharge construction and reduce the construction difficulty.
Slickwater formulated with conventional drag reducers because the final fluid viscosity is too low to suspend and transport the proppants for a long period of time, only small screen sand at an earlier stage is pumped with slickwater, and in order to increase permeability, a linear or crosslinked gel is used later to transport the larger particle size proppants into the main fracture. Many current hydraulic fracturing operations employ a mixing process by combining a low viscosity slickwater stage with a high viscosity linear gel or cross-linked gel stage, thus often requiring separate hydration and mixing equipment to prepare the fluid ahead of time, and are labor intensive.
In order to adapt to the increasingly large industrial fracturing construction operation, the conventional fracturing fluid additive needs to be integrated and simplified, and a discharge assisting agent, a clay stabilizer and the like, a drag reducer and a thickening agent are prepared into a multi-effect multifunctional fracturing fluid additive through technical means in an optimized manner, so that the multifunctional fracturing fluid additive is an important development trend of the conventional fracturing fluid development.
As the clay stabilizer is mainly cationic quaternary ammonium salt and polymerized cations, the cleanup additive is a compound of various surfactants which mainly comprise fluorocarbon surfactants, and the two surfactants exist in the form of aqueous solution. And the drag reducer of the fracturing fluid, the guar gum and the like exist in the form of solid or suspension emulsion and inverse emulsion, and when encountering a small amount of water, the drag reducer of the fracturing fluid can quickly absorb water and swell to cause unstable system and even gel, so that the multifunctionalization of the fracturing fluid additive is difficult to realize through simple compounding.
Disclosure of Invention
The application aims at: the application provides a multifunctional viscosity-changing slick water fracturing fluid additive, a preparation method and application thereof, and aims to solve the technical problems that the system is unstable and even gel is caused by rapid water absorption and swelling after a small amount of water is obtained by a drag reducer, guar gum and the like in the existing fracturing fluid additive, and the multifunctionalization of the fracturing fluid additive is difficult to realize through simple compounding.
The application adopts the following technical scheme for realizing the purposes: the multifunctional viscosity-changing slick water fracturing fluid additive is prepared through adding nanometer antiswelling agent particle into white oil containing mixed hydrocarbon-fluorocarbon surfactant emulsifying system to obtain oil phase, high speed shearing to emulsify with water phase comprising water soluble vinyl monomer aqua and initiator, introducing nitrogen to deoxidize, oxidation-reduction initiated reverse emulsion polymerization and demulsifying with reverse surfactant.
In the technical scheme of the application, in order to realize the multifunctionalization of the fracturing fluid additive and realize the functions of drag reduction, sand carrying, expansion prevention and efficient flowback of the fracturing fluid, the difficulties in the prior art are overcome, the super-hydrophobic nanometer expansion inhibitor particles with the expansion prevention function, which are dispersed in oil and not dispersed in water, are introduced around the inverse emulsion polymerization process, and the nanometer expansion inhibitor particles can not be dissolved in water in the aqueous solution, so that the compatibility with polymer molecular chains is good, and the nanometer expansion inhibitor particles are degraded in the gel breaking process so as to release and provide a cation center, have the expansion prevention performance, and provide good expansion prevention performance with the coordination and synergy of ammonium ions in the aqueous phase.
Compared with the existing inverse emulsion polymerization process, the non-ionic fluorocarbon surfactant is introduced as a reaction emulsifier and a demulsifier, and plays a role in emulsification and later demulsification in the polymerization process, so that the dosage of the common hydrocarbon surfactant is reduced, and the fluorocarbon surfactant has good surface-interface activity under reasonable addition, so that the gel breaking solution has lower surface-interface tension.
Further, the preparation method specifically comprises the following steps:
step 1, uniformly mixing hydrocarbon-fluorocarbon surfactant and white oil to obtain an oil phase, and adding nano anti-swelling agent particles into the oil phase;
step 2, preparing a water-soluble monomer into a solution, regulating the pH to be 6.5-7.5 by using an ammonia water solution, and adding 1%wt of ammonium persulfate aqueous solution and 0.5%wt of azo diiso Ding Mi hydrochloride VA-044 solution to obtain a water phase;
step 3, adding the water phase into the oil phase containing the nanometer anti-swelling agent particles in the step 1, and performing high-speed shearing emulsification to obtain inverse emulsion;
step 4, introducing nitrogen to remove oxygen, dropwise adding 0.5 wt% of sodium bisulphite for water dissolution, stopping adding the sodium bisulphite solution when the temperature is increased to 35 ℃, starting to cool with an ice water bath to control the reaction temperature to 40-45 ℃, stopping water bath to control the temperature, adding 0.5 wt% of sodium bisulphite solution in the later period of temperature start to drop after heat preservation reaction, continuing until the temperature does not continuously drop, and finishing the reaction for 2-5h;
and 5, adding the reverse phase surfactant and stirring to obtain the fracturing fluid additive.
Further, the preparation method of the nanometer anti-swelling agent particles comprises the following steps: according to the weight portion, 200g of allyl dimethyl hydroxyethyl ammonium chloride, 45g of octadecyl acrylate and 5g of pentaerythritol allyl ether are dissolved in 500g of ethyl acetate, nitrogen is introduced to remove oxygen for 1h, then the temperature is raised to 40-50 ℃,0.6g of azodiisobutyl cyanide is added to initiate precipitation polymerization, and then suction filtration and drying are carried out, thus obtaining the catalyst.
Further, in the fracturing fluid additive, the mass of the nanometer anti-swelling agent particles accounts for 4.0-10.0wt% of the total mass of the fracturing fluid additive, the mass of the water-soluble vinyl monomer accounts for 20-40wt wt% of the total mass of the fracturing fluid additive, the mass of the white oil accounts for 15-25wt% of the total mass of the fracturing fluid additive, the mass of the hydrocarbon-fluorocarbon surfactant accounts for 2.0-3.0wt% of the total mass of the fracturing fluid additive, the mass of the ammonium persulfate additive accounts for 0.0001-0.002wt% of the total mass of the fracturing fluid additive, the mass of the azo diiso Ding Mi hydrochloride accounts for 0.0001-0.005wt% of the total mass of the fracturing fluid additive, the mass of the reverse phase surfactant accounts for 0.5-3wt% of the total mass of the fracturing fluid additive, the mass of the sodium bisulphite accounts for 0.005-0.025wt% of the total mass of the fracturing fluid additive, and the balance is water.
Further, the water-soluble vinyl monomer is a mixture of acrylamide, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, and the mass ratio of the acrylamide, the acrylic acid and the 2-acrylamide-2-methylpropanesulfonic acid is 50-80:20-40:0-20.
Further, the hydrocarbon-fluorocarbon surfactant comprises one or more of span 20, span 80, span 85, tween 20, tween 80, tween 81 and perfluorobutyric acid diethanolamide, span 20, span 80, span 85, tween 20, tween 80, tween 81 and perfluorobutyric acid diethanolamide.
Further, the reverse phase surfactant includes one or more of fatty alcohol polyvinyl ether AEO7, fluorocarbon surfactant FM21, and fluorocarbon surfactant FM 10.
Further, the fracturing fluid additive is prepared into an aqueous solution with the weight percent of 0.05-0.10 to obtain the anti-drag water, and the drag reduction rate is more than 70%.
Further, the fracturing fluid additive is prepared into 1.0 wt% of water solution to obtain sand-carrying fluid, and the sand-carrying fluid is prepared at 100 ℃ for 170s -1 Shearing for 2h, wherein the apparent viscosity is more than 60mPa.s.
Further, the fracturing fluid additive is prepared into 1.0 wt% of clear water solution to obtain sand-carrying fluid, the sand-carrying fluid is broken by 0.05% of ammonium persulfate at 60 ℃, the viscosity of the broken glue solution is less than 5 Pa.s within 1h, the expansion resistance can reach 80%, the surface tension is less than 25mN/m, and the interfacial tension is less than 2mN/m.
In the technical scheme of the application, the manufacturer of the perfluorobutyric acid diethanolamide is Sichuan Ai Neng, the manufacturing company of the fluorocarbon surfactant FM21 and the fluorocarbon surfactant FM10 is Hangzhou ren and China, the science and technology company.
The beneficial effects of the application are as follows:
1. according to the application, the super-hydrophobic nanometer anti-swelling agent particles with anti-swelling effect are introduced around an inverse emulsion polymerization process, and the oil with anti-swelling effect is dispersed and the water is not dispersed, so that the nanometer anti-swelling agent particles can not be dissolved in water in an aqueous solution, and have good compatibility with polymer molecular chains, and in the gel breaking process, the nanometer anti-swelling agent particles are degraded to release and provide a cation center, so that the nanometer anti-swelling agent particles have anti-swelling performance, and in addition, the nanometer anti-swelling agent particles and ammonium ions in the aqueous phase are coordinated and synergistic to provide good anti-swelling performance;
2. compared with the existing inverse emulsion polymerization process, the non-ionic fluorocarbon surfactant is introduced as a reaction emulsifier and a demulsifier, and plays a role in emulsification and later demulsification in the polymerization process, so that the dosage of the common hydrocarbon surfactant is reduced, and the fluorocarbon surfactant has good surface-interface activity under reasonable addition, so that the gel breaking solution has lower surface-interface tension;
3. the multifunctional viscosity-changing slick water fracturing fluid additive is prepared into 0.05-0.10wt% of clear water solution to obtain water-reducing resistance, and the drag reduction rate is more than 70%;
4. the multifunctional viscosity-changing slick water fracturing fluid additive is prepared into 1.0 wt% of clear water solution to obtain sand-carrying fluid, and the sand-carrying fluid is sheared for 2 hours at the temperature of 100 ℃ for 170s < -1 >, and the apparent viscosity is more than 60mPa.s; the method comprises the steps of carrying out a first treatment on the surface of the
5. The multifunctional viscosity-changing slick water fracturing fluid additive is prepared into 1.0 wt% of clear water solution to obtain sand-carrying fluid, the sand-carrying fluid is broken by 0.05% of ammonium persulfate at 60 ℃, the viscosity of the broken glue solution is less than 5mN/m within 1h, the expansion-preventing rate can reach 80%, the surface tension is less than 25mN/m, and the interfacial tension is less than 2
mN/m。
Drawings
FIG. 1 is a schematic illustration of the dispersion properties of the anti-swelling agent particles of the present application;
FIG. 2 is a graph of particle size of A of FIG. 1 in accordance with the present application;
FIG. 3 is a reaction temperature rise curve of example 2 of the present application;
FIG. 4 is a graph showing rheological data at 100deg.C for a 1.0% solution of the fracturing fluid additive prepared in example 4 formulated with tap water;
FIG. 5 is a graph of rheological data at 80℃for a 0.5% solution of the fracturing fluid additive prepared in example 4 formulated with tap water;
FIG. 6 is a test result of drag reduction rate of the product of example 2 configured as a solution;
FIG. 7 is a schematic structural diagram of a nano-anti-swelling agent particle.
Detailed description of the preferred embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described in the following in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
200g of allyl dimethyl hydroxyethyl ammonium chloride, 45g of octadecyl acrylate and 5g of pentaerythritol allyl ether are weighed and dissolved in 500g of ethyl acetate, the temperature is raised to 40-50 ℃ after nitrogen is introduced to remove oxygen for 1h, the precipitation polymerization is started, 0.6g of initiator azo diisobutyl cyanide is added three times, the time interval is 1.5h, the heat preservation reaction is continued for 2h after the initiator is added, the mixture is cooled to normal temperature, and then suction filtration and drying are carried out to obtain the anti-swelling agent particle powder.
Weighing 0.25g of anti-swelling agent particle powder, dispersing in 50g of No. 3 white oil, performing ultrasonic dispersion for 5min to obtain uniform dispersion, testing the particle size of the uniform dispersion by using a nanometer laser particle size analyzer as shown in a graph 1A, and measuring the average particle size D50 of the uniform dispersion as 572.4nm as shown in a graph 2, wherein the anti-swelling agent particles are nano-scale; 0.25g of the anti-swelling agent granule powder was weighed, slowly added into 50g of deionized water, magnetically stirred at 50 ℃ for 4 hours, and the anti-swelling agent granule was not dispersed and not dissolved, as shown in fig. 1B, and the particle size could not be tested. The anti-swelling agent particles of the present application are described as being positively charged superhydrophobic particles that are oil-dispersed but water-non-dispersed.
The structure of the anti-swelling agent particles is shown in figure 7,represents octadecyl acrylate,/->Indicating positive charge,/->Represents pentaerythritol allyl ether.
The table corresponding to fig. 2 is as follows:
example 2
(1) And (3) preparing an initiator solution:
preparing 0.5 wt% of VA-044 (azodiiso Ding Mi hydrochloride) solution, 1 wt% of ammonium persulfate aqueous solution and 0.5 wt% of sodium bisulphite water solution by deionized water respectively;
(2) Preparing an oil phase:
220g of industrial white oil, 20g of span 80, 3g of tween 81, 2g of perfluorobutyric acid diethanolamide and 55g of nano anti-swelling agent particles are added into a 1000mL open reactor, and magnetic stirring is carried out uniformly to obtain an oil phase;
(3) Water phase preparation
180g of acrylamide, 85g of acrylic acid, 30g of 2-acrylamide-2-methylpropanesulfonic acid and 260g of deionized water are weighed in a 1000mL beaker, and are magnetically stirred uniformly, wherein the mass ratio of the three water-soluble vinyl monomers is 65.67:30.57:3.75;
weighing 125g of ammonia water, slowly dripping the ammonia water into the monomer aqueous solution for neutralization, controlling the neutralization temperature to be lower than 25 ℃, and controlling the pH value after neutralization to be=6.55;
6mL of 0.5% wt VA-044 and 1mL of 1% wt ammonium persulfate in water are added;
(4) High speed shear emulsification
The aqueous and oil phases were added to a beaker and homogenized 12000r/min for 5min under high shear to give a viscous emulsion with an apparent viscosity of 750mpa.s measured with a six-speed viscometer (100 rpm).
(5) Deoxidizing by introducing nitrogen and polymerizing reaction
Introducing nitrogen to deoxidize for 1 hour, controlling the temperature to 17-20 ℃ by using an ice water bath, dropwise adding 0.5 wt% of sodium bisulphite into the mixture by using a metering pump according to 1.0mL/h, dissolving the sodium bisulphite in water, starting the reaction at 17.6 ℃, stopping adding the sodium bisulphite solution when the temperature rises to 35 ℃, starting to cool the mixture by using the ice water bath, controlling the reaction at 40-45 ℃, starting to drop the temperature, removing the ice water bath, after a period of heat preservation reaction, starting to supplement 5.0mL/h of the sodium bisulphite solution when the temperature starts to drop, continuing to the temperature, stopping the reaction, and finishing the reaction for 2.5 hours, wherein the reaction is shown in figure 3.
(6) Demulsification
20g of fatty alcohol polyvinyl ether AEO7 and 1g of fluorocarbon surfactant FM21 are added, and stirring is continued for 30min to obtain the fracturing fluid additive.
Example 3
(1) Preparing an oil phase:
260g of industrial white oil, 10g of span 20, 12g of span 80, 4g of tween 81 and 1.5g of perfluorobutyric acid diethanolamide are added into a 1000mL open reactor, and 80g of anti-swelling particles are magnetically stirred uniformly to obtain an oil phase;
(2) Water phase preparation
180g of acrylamide, 85g of acrylic acid, 30g of 2-acrylamide-2-methylpropanesulfonic acid and 220g of deionized water are weighed in a 1000mL beaker, and are magnetically stirred uniformly, wherein the mass ratio of the three water-soluble vinyl monomers is 68.40:22.48:9.12;
weighing 110.6g of ammonia water, slowly dripping the ammonia water into the aqueous monomer solution for neutralization, controlling the neutralization temperature to be lower than 25 ℃, and controlling the pH value after neutralization to be=6.75;
8mL of 0.5% wt VA-044 and 1.5mL of 1% wt ammonium persulfate in water are added;
(3) High speed shear emulsification
The aqueous and oil phases were added to a beaker and homogenized 12000r/min for 5min under high shear to give a viscous emulsion with an apparent viscosity of 84mpa.s measured with a six-speed viscometer (100 rpm).
(4) Deoxidizing by introducing nitrogen and polymerizing reaction
Introducing nitrogen to deoxidize for 1 hour, controlling the temperature to 17-20 ℃ by using an ice water bath, dropwise adding 0.5 wt% of sodium bisulphite into the mixture by using a metering pump according to 1.0mL/h, dissolving the sodium bisulphite in water, wherein the initial reaction temperature is 17.4 ℃, stopping adding the sodium bisulphite solution when the temperature rises to 35 ℃, starting to cool the mixture by using the ice water bath, controlling the reaction temperature to 40-45 ℃, starting to drop the temperature, removing the ice water bath, keeping the temperature for a period of time, starting to supplement the sodium bisulphite solution by 3mL/h when the temperature starts to drop, continuing until the temperature does not continuously drop, ending the reaction, and reacting for 3.5 hours.
(6) Demulsification
20g of fatty alcohol polyvinyl ether AEO7 and 1.2g of fluorocarbon surfactant FM10 are added, and stirring is continued for 30min to obtain the fracturing fluid additive.
Example 4
(1) Preparing an oil phase:
240g of industrial white oil, 15g of span 80, 5g of span 20, 2g of span 85, 4g of tween 80 and 1.4g of perfluorobutyric acid diethanolamide are added into a 1000mL open reactor, and 75g of anti-swelling agent particles are magnetically stirred uniformly to obtain an oil phase;
(2) Water phase preparation
165g of acrylamide, 100g of acrylic acid, 50g of 2-acrylamide-2-methylpropanesulfonic acid and 220g of deionized water are weighed in a 1000mL beaker, and are magnetically stirred uniformly, wherein the mass ratio of the three water-soluble vinyl monomers is 58.77:35.12:6.11;
weighing 154.0g of ammonia water, slowly dripping the ammonia water into the aqueous monomer solution for neutralization, controlling the neutralization temperature to be lower than 25 ℃, and controlling the pH value after neutralization to be=6.55;
4mL of 0.5% wt VA-044 and 1.5mL of 1% wt ammonium persulfate in water are added;
(3) High speed shear emulsification
The aqueous and oil phases were added to a beaker and homogenized 12000r/min for 5min under high shear to give a viscous emulsion with an apparent viscosity of 900mpa.s measured with a six-speed viscometer (100 rpm).
(4) Deoxidizing by introducing nitrogen and polymerizing reaction
Introducing nitrogen to deoxidize for 1 hour, controlling the temperature to 17-20 ℃ by using an ice water bath, dropwise adding 0.5 wt% of sodium bisulphite into the mixture by using a metering pump according to 1.0mL/h, dissolving the sodium bisulphite in water, wherein the initial reaction temperature is 17.8 ℃, stopping adding the sodium bisulphite solution when the temperature rises to 35 ℃, starting to cool the mixture by using the ice water bath, controlling the reaction temperature to 40-45 ℃, starting to drop the temperature, removing the ice water bath, after the heat preservation reaction is carried out for a period of time, starting to supplement 5mL/h of the sodium bisulphite solution when the temperature starts to drop, continuing until the temperature does not continuously drop, ending the reaction, and carrying out the reaction for 3.5 hours.
(6) Demulsification
20g of fatty alcohol polyvinyl ether AEO7, 0.4g of fluorocarbon surfactant FM10 and 0.8g of fluorocarbon surfactant FM21 are added, and stirring is continued for 30min to obtain the fracturing fluid additive.
Example 5
(1) Preparing an oil phase:
240g of industrial white oil, 15g of span 80, 5g of span 20, 2g of span 85, 2g of tween 80, 2g of tween 81 and 1.2g of perfluoro-butyric acid diethanolamide are added into a 1000mL open reactor, and 100g of anti-swelling agent particles are magnetically stirred uniformly to obtain an oil phase;
(2) Water phase preparation
130g of acrylamide, 50g of acrylic acid, 120g of 2-acrylamide-2-methylpropanesulfonic acid and 220g of deionized water are weighed in a 1000mL beaker, and are magnetically stirred uniformly, wherein the mass ratio of the three water-soluble vinyl monomers is 58.96:22.36:18.67;
weighing 120.0g of ammonia water, slowly dripping the ammonia water into the aqueous monomer solution for neutralization, controlling the neutralization temperature to be lower than 25 ℃, and controlling the pH value after neutralization to be=6.55;
7.5mL of 0.5% wt VA-044 and 2mL of 1% wt ammonium persulfate in water are added;
(3) High speed shear emulsification
The aqueous and oil phases were added to a beaker and homogenized 12000r/min for 5min under high shear to give a viscous emulsion with an apparent viscosity of 1080mpa.s measured with a six-speed viscometer (100 rpm).
(4) Deoxidizing by introducing nitrogen and polymerizing reaction
Introducing nitrogen to deoxidize for 1 hour, controlling the temperature to 17-20 ℃ by using an ice water bath, dropwise adding 0.5 wt% of sodium bisulphite into the mixture by using a metering pump according to 1.0mL/h, dissolving the sodium bisulphite in water, wherein the initial reaction temperature is 17.8 ℃, stopping adding the sodium bisulphite solution when the temperature rises to 35 ℃, starting to cool the mixture by using the ice water bath, controlling the reaction temperature to 40-45 ℃, starting to drop the temperature, removing the ice water bath, after the heat preservation reaction is carried out for a period of time, starting to supplement 5mL/h of the sodium bisulphite solution when the temperature starts to drop, continuing until the temperature does not continuously drop, ending the reaction, and reacting for 4.0 hours.
(6) Demulsification
21g of fatty alcohol polyvinyl ether AEO7, 0.5g of fluorocarbon surfactant FM21 and 0.5g of fluorocarbon surfactant FM10 are added, and stirring is continued for 30min to obtain the fracturing fluid additive.
Comparative example
(1) Oil phase formulation
220g of industrial white oil, 20g of span 80 and 3g of Tween 81 are added into a 1000mL open reactor, and the mixture is stirred magnetically and uniformly to obtain an oil phase.
(3) Water phase preparation
180g of acrylamide, 85g of acrylic acid, 30g of 2-acrylamide-2-methylpropanesulfonic acid and 260g of deionized water are weighed in a 1000mL beaker, and are magnetically stirred uniformly, wherein the mass ratio of the three water-soluble vinyl monomers is 65.67:30.57:3.75;
weighing 125g of ammonia water, slowly dripping the ammonia water into the monomer aqueous solution for neutralization, controlling the neutralization temperature to be lower than 25 ℃, and controlling the pH value after neutralization to be=6.55;
6mL of 0.5% wt VA-044 and 2mL of 1% wt ammonium persulfate in water are added;
(4) High speed shear emulsification
The aqueous and oil phases were added to a beaker and homogenized 12000r/min for 5min under high shear to give a viscous emulsion with an apparent viscosity of 720mpa.s measured with a six-speed viscometer (100 rpm).
(5) Deoxidizing by introducing nitrogen and polymerizing reaction
Deoxidizing for 1 hour by introducing nitrogen, controlling the temperature to 17-20 ℃ by using an ice water bath, dropwise adding 0.5% wt of sodium bisulphite into the mixture by using a metering pump according to 1.0mL/h, dissolving the sodium bisulphite in water, wherein the initial reaction temperature is 17.4 ℃, stopping adding the sodium bisulphite solution when the temperature rises to 35 ℃, starting cooling the mixture by using the ice water bath, controlling the reaction temperature to 40-45 ℃, and supplementing the sodium bisulphite solution in the later stage, continuing until the temperature does not continuously drop, and finishing the reaction for 3.5 hours;
(6) Demulsification
23g of fatty alcohol polyvinyl ether AEO7 is added, and the mixture is stirred for 30min to obtain the fracturing fluid additive.
Application example 1
The multifunctional slickwater fracturing fluid additives prepared in examples 2-5 were prepared with tap water (total mineralization 235 mg/L) to give solutions of 0.1% wt, 0.5% wt, and 1.0% wt, respectively, and their apparent viscosities were measured with a six-speed viscometer, with the results shown in Table 1 below:
TABLE 1 apparent viscosity of fracturing fluid additives at various concentrations
From the table above, the viscosity of the prepared multifunctional slickwater fracturing fluid additive increases with the increase of the concentration, so that the viscosity-changing function can be realized by adjusting the concentration in real time.
A 1.0% solution of the fracturing fluid additive prepared in example 4 formulated with tap water was tested for rheological data at 100 c as detailed in figure 4 below. As can be seen from FIG. 4, the viscosity of the fracturing fluid prepared from 1% of the additive is kept at 60mPa.s after the fracturing fluid is sheared for 2 hours at the constant temperature of 100 ℃, and the fracturing fluid has good temperature and shear resistance and can meet the fracturing construction of oil and gas wells with well temperatures within 100 ℃.
A 0.5% solution of the fracturing fluid additive prepared in example 4 formulated with tap water was tested for rheological data at 80 c as detailed in figure 5 below. As can be seen from FIG. 5, the fracturing fluid prepared from 0.5% of the additive has the viscosity kept at 50mPa.s after being sheared for 2 hours at the constant temperature of 80 ℃, has good temperature and shearing resistance, and can meet the requirement of oil and gas well fracturing construction at well temperature within 80 ℃.
Application example 2
The 7.7.1.1 in the reference standard SY/T5107-2016 water-based fracturing fluid evaluation prescription requires the preparation of standard saline, which comprises the following components: 2.0% KCl+5.5% NaCl+0.45% MgCl2+0.55% CaCl2.
The multifunctional viscosified slick fracturing fluid additives prepared in examples 2-5 were formulated with 10% standard mineralized water (8500 mg/L) to 1.0% wt and 1.5% wt solutions, respectively, and tested for apparent viscosity using a six-speed viscometer, with the results given in Table 2 below:
TABLE 2 apparent viscosity of fracturing fluid additives at various concentrations
Application example 3
The multifunctional slick water fracturing fluid additives prepared in examples 2-5 were prepared by preparing 1.0% wt solutions with tap water (total mineralization degree 235 mg/L), adding 0.04% ammonium persulfate, stirring well, placing in 80 ℃ water bath for gel breaking for 4 hours, and testing the surface tension and interfacial tension with kerosene after gel breaking thoroughly.
TABLE 3 interfacial tension of fracturing fluid gel-breaking fluid
Compared with the comparative example, the fracturing fluid prepared by the fracturing fluid additive provided by the application has the obvious effect of reducing the surface tension after the fluorocarbon surfactant is introduced, the surface tension of the gel breaking fluid is less than 25mN/m, and the surface tension is less than 2mN/m.
Application example 4
(1) Preparation of gel breaking solution
The multifunctional slick water fracturing fluid additives prepared in examples 2-5 were prepared into 1.0% wt solutions with tap water (total mineralization degree 235 mg/L), added with 0.04% ammonium persulfate, stirred uniformly, placed in a 80 ℃ water bath for gel breaking for 4 hours, and tested for clay swelling prevention after gel breaking is complete.
(2) Anti-swelling test
(1) Weighing 0.5000g of sodium bentonite with a size of 200 meshes, adding into a 10mL centrifuge tube, adding 10mL of gel breaking liquid, stirring, fully dispersing uniformly, and standing for 2h;
(2) centrifuging the centrifuge tube for 15 minutes at 1500r/min, and reading the volume V1 of the bentonite;
(3) calculating the anti-swelling rate:
volume of the V1-latex breaking solution after clay expansion
0.6-kerosene swell volume
TABLE 4 anti-swelling rate of fracturing fluid gel breaking surface tension agent
| Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | 0.5％KCl | |
| V1/mL | 3.4 | 3.1 | 3 | 2.4 | 7 | 3.6 |
| Expansion resistance/% | 70.21 | 73.40 | 74.47 | 80.85 | 31.91 | 68.09 |
Under the action of high-temperature ammonium persulfate, the anti-swelling agent particles undergo free radical degradation to form a poly-propyl dimethyl hydroxyethyl ammonium chloride molecular chain segment, and can be effectively adsorbed on the surface of clay and embedded in crystal lattices, so that the clay anti-swelling effect is shown.
Compared with the comparative example, the fracturing fluid prepared by the fracturing fluid additive provided by the application has the advantages that after the anti-swelling agent particles are used, the anti-swelling rate is obviously improved, the anti-swelling rate is better than that of 0.5% KCl solution, and the highest anti-swelling rate is more than 80%.
Application example 5
The product of example 2 was prepared into 0.05-0.15% solution, and the drag reduction ratio was measured by using a pipeline friction tester of Jiangsu sea Ann petrochemical plant, and the measurement result is shown in FIG. 6.
Claims (10)
1. A multifunctional viscosity-changing slick water fracturing fluid additive is prepared through adding nano anti-swelling agent particles into white oil containing hydrocarbon-fluorocarbon surfactant mixed emulsion system to obtain oil phase, high-speed shearing and emulsifying with water phase composed of water-soluble vinyl monomer aqueous solution and initiator, introducing nitrogen to remove oxygen, reverse emulsion polymerizing reaction induced by oxidation reduction and breaking emulsion of reverse surfactant.
2. The preparation method of the multifunctional slickwater fracturing fluid additive according to claim 1, which is characterized by comprising the following steps:
step 1, uniformly mixing hydrocarbon-fluorocarbon surfactant and white oil to obtain an oil phase, and adding nano anti-swelling agent particles into the oil phase;
step 2, preparing a water-soluble monomer into a solution, regulating the pH to be 6.5-7.5 by using an ammonia water solution, and adding 1%wt of ammonium persulfate aqueous solution and 0.5%wt of azo diiso Ding Mi hydrochloride VA-044 solution to obtain a water phase;
step 3, adding the water phase into the oil phase containing the nanometer anti-swelling agent particles in the step 1, and performing high-speed shearing emulsification to obtain inverse emulsion;
step 4, introducing nitrogen to remove oxygen, dropwise adding 0.5 wt% of sodium bisulphite for water dissolution, stopping adding the sodium bisulphite solution when the temperature is increased to 35 ℃, starting to cool with an ice water bath to control the reaction temperature to 40-45 ℃, stopping water bath to control the temperature, adding 0.5 wt% of sodium bisulphite solution in the later period of temperature start to drop after heat preservation reaction, continuing until the temperature does not continuously drop, and finishing the reaction for 2-5h;
and 5, adding the reverse phase surfactant and stirring to obtain the fracturing fluid additive.
3. The method for preparing the multifunctional slickwater fracturing fluid additive according to claim 1 or 2, wherein the preparation method of the nano anti-swelling agent particles is as follows: according to the weight portion, 200g of allyl dimethyl hydroxyethyl ammonium chloride, 45g of octadecyl acrylate and 5g of pentaerythritol allyl ether are dissolved in 500g of ethyl acetate, nitrogen is introduced to remove oxygen for 1h, then the temperature is raised to 40-50 ℃,0.6g of azodiisobutyl cyanide is added to initiate precipitation polymerization, and then suction filtration and drying are carried out, thus obtaining the catalyst.
4. A fracturing fluid additive prepared by the preparation method of the multifunctional variable viscosity slick water fracturing fluid additive as claimed in any one of claims 1 to 3, wherein in the fracturing fluid additive, the mass of nano anti-swelling agent particles accounts for 4.0 to 10.0wt% of the total mass of the fracturing fluid additive, the mass of water-soluble vinyl monomers accounts for 20 to 40wt% of the total mass of the fracturing fluid additive, the mass of white oil accounts for 15 to 25wt% of the total mass of the fracturing fluid additive, the mass of hydrocarbon-fluorocarbon surfactant accounts for 2.0 to 3.0wt% of the total mass of the fracturing fluid additive, the mass of ammonium persulfate accounts for 0.0001 to 0.002wt% of the total mass of the fracturing fluid additive, the mass of azo diiso Ding Mi hydrochloride accounts for 0.5 to 3wt% of the total mass of the fracturing fluid additive, the mass of sulfite accounts for 0.0001 to 0.005wt% of the total mass of the fracturing fluid additive, and the balance sodium bisulfate is water.
5. The fracturing fluid additive of claim 4, wherein the water-soluble vinyl monomer is a mixture of acrylamide, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, and the mass ratio of acrylamide, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid is 50-80:20-40:0-20.
6. The fracturing fluid additive of claim 4, wherein the hydrocarbon-fluorocarbon surfactant comprises one or more of span 20, span 80, span 85, tween 20, tween 80, tween 81, and perfluorobutyric acid diethanolamide, span 20, span 80, span 85, tween 20, tween 80, tween 81, and perfluorobutyric acid diethanolamide.
7. The fracturing fluid additive of claim 4, wherein the reverse phase surfactant comprises one or more of fatty alcohol polyvinyl ether AEO7, fluorocarbon surfactant FM21, and fluorocarbon surfactant FM 10.
8. The use of a fracturing fluid additive of any of claims 4-7, wherein the fracturing fluid additive is formulated as a 0.05-0.10wt% aqueous solution to obtain a drag reduction water having a drag reduction ratio of greater than 70%.
9. The use of the fracturing fluid additive according to any one of claims 4-7, wherein the fracturing fluid additive is prepared into 1.0 wt% of aqueous solution to obtain sand-carrying fluid, and the sand-carrying fluid is prepared at 100 ℃ for 170s -1 Shearing for 2h, wherein the apparent viscosity is more than 60mPa.s.
10. The use of the fracturing fluid additive according to any one of claims 4 to 7, wherein the fracturing fluid additive is prepared into 1.0 wt% of aqueous solution to obtain sand-carrying fluid, the sand-carrying fluid is broken by using 0.05% of ammonium persulfate at 60 ℃, the viscosity of the broken glue solution is less than 5mpa.s within 1h, the swelling prevention rate can reach 80%, the surface tension is less than 25mN/m, and the interfacial tension is less than 2mN/m.
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