CN113024745A - Polymer emulsion for fracturing of oil and gas reservoir and preparation method thereof - Google Patents
Polymer emulsion for fracturing of oil and gas reservoir and preparation method thereof Download PDFInfo
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- CN113024745A CN113024745A CN202110269573.4A CN202110269573A CN113024745A CN 113024745 A CN113024745 A CN 113024745A CN 202110269573 A CN202110269573 A CN 202110269573A CN 113024745 A CN113024745 A CN 113024745A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 52
- 239000000839 emulsion Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000003921 oil Substances 0.000 claims abstract description 49
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 claims abstract description 23
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 22
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 17
- 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 abstract description 15
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229920000578 graft copolymer Polymers 0.000 claims abstract description 15
- 239000002738 chelating agent Substances 0.000 claims abstract description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000003999 initiator Substances 0.000 claims abstract description 11
- HVUMOYIDDBPOLL-XGKPLOKHSA-N [2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XGKPLOKHSA-N 0.000 claims abstract description 9
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims abstract description 9
- 229920000053 polysorbate 80 Polymers 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 25
- 239000012071 phase Substances 0.000 claims description 20
- 238000006116 polymerization reaction Methods 0.000 claims description 13
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 7
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 239000008346 aqueous phase Substances 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 37
- 230000000694 effects Effects 0.000 abstract description 7
- 239000002105 nanoparticle Substances 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 5
- 238000007334 copolymerization reaction Methods 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- -1 acrylic ester Chemical class 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229920000136 polysorbate Polymers 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000004908 Emulsion polymer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 238000012688 inverse emulsion polymerization Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000007908 nanoemulsion Substances 0.000 description 1
- 238000006902 nitrogenation reaction Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
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- 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
- C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
-
- 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
- C09K8/665—Compositions based on water or polar solvents containing inorganic 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
- 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
- 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
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
The invention relates to a polymer emulsion for fracturing of an oil-gas reservoir and a preparation method thereof, wherein the polymer emulsion comprises acrylamide, a graft copolymer of acrylate and silicon dioxide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, an initiator, water, white oil, Tween80, Span60 and a chelating agent. According to the invention, the silica nanoparticles are introduced into the polymer in a graft copolymerization mode, so that the effect of stabilizing the fluid is achieved, the viscosity retention rate of the viscoelastic fluid is improved, the direct effect is represented as that the using concentration of the polymer is lower, the silica nanoparticles with positive charges can enable the zero shear viscosity, the longest relaxation time and the storage modulus of the solution to be improved to different degrees, and the direct effect is represented as that the salt resistance of the polymer is better.
Description
Technical Field
The invention relates to the technical field of fracturing fluid, in particular to a polymer emulsion for fracturing of an oil-gas reservoir and a preparation method thereof.
Background
The fracturing modification is an effective reservoir production increase measure, fracturing fluid is squeezed into a stratum through ground high-pressure pumping equipment, the stratum is crushed to form a fracture, the fracturing fluid carries a propping agent to enter the stratum, the fracture is propped when the fracture is closed, and a high flow guide channel is formed, so that the purposes of increasing the reservoir permeability and an oil (gas) drainage channel and increasing the production are achieved finally. The fracturing fluid is a heterogeneous unstable chemical system formed by a plurality of additives according to a certain proportion, is a working fluid used for fracturing modification of an oil-gas layer, and has the main functions of transmitting high pressure formed by ground equipment into a stratum, enabling the stratum to fracture to form a fracture and conveying a propping agent along the fracture. However, the performance of the fracturing fluid in the prior art still has many defects, such as high polymer use concentration, poor viscoelasticity, large oil-water interfacial tension, poor salt resistance and the like.
Disclosure of Invention
The invention aims to provide a polymer emulsion for fracturing of an oil-gas reservoir and a preparation method thereof, which solve the problems of fracturing fluid in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows: a polymer emulsion for fracturing oil and gas reservoirs comprises acrylamide, a graft copolymer of acrylate and silicon dioxide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, an initiator, water, white oil, Tween80, Span60 and a chelating agent.
In the polymer emulsion for fracturing oil and gas reservoirs, the mass ratio of the acrylamide, the graft copolymer of the acrylic ester and the silicon dioxide, the 2-acrylamide-2-methylpropanesulfonic acid, the 2-methacryloyloxyethyl trimethyl ammonium chloride and the methacryloyloxyethyl trimethyl ammonium chloride is (9-12.3): (1-5): (9-11.8): (9-10.8): (9-10.8).
In the polymer emulsion for fracturing the oil-gas reservoir, the mass ratio of the white oil, the Tween80, the Span60 and the chelating agent is (21-30): (1.6-2.4): (1.6-2.4): (0.08-0.13).
In the polymer emulsion for fracturing the oil and gas reservoir, the total mass of the acrylamide, the graft copolymer of the acrylate and the silicon dioxide, the 2-acrylamide-2-methylpropanesulfonic acid, the 2-methacryloyloxyethyl trimethyl ammonium chloride and the methacryloyloxyethyl trimethyl ammonium chloride accounts for 30-60 percent of the total mass.
In the polymer emulsion for fracturing oil and gas reservoirs, each initiator accounts for 0.08-0.12% of the total mass of the polymer emulsion.
In the polymer emulsion for fracturing oil and gas reservoirs, the acrylamide, the graft copolymer of the acrylate and the silicon dioxide, the 2-acrylamide-2-methylpropanesulfonic acid, the 2-methacryloxyethyltrimethyl ammonium chloride, the initiator and the water are combined into an aqueous phase, the white oil, the Tween80, the Span60 and the chelating agent are combined into an oil phase, and the mass ratio of the oil phase to the aqueous phase is (25-32): (68-75).
In the polymer emulsion for fracturing a hydrocarbon reservoir of the present invention, the initiator includes ammonium persulfate, azobisisobutyronitrile and/or sodium bisulfite.
In the polymer emulsion for fracturing the oil and gas reservoir, the particle diameter of the polymer emulsion is less than or equal to 200 nm.
The invention also provides a preparation method of the polymer emulsion, which comprises the following steps: stirring and mixing white oil, Tween80, Span60 and a chelating agent uniformly to obtain an oil phase, stirring acrylamide, a graft copolymer of acrylate and silicon dioxide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, an initiator and water in an inert gas environment for polymerization reaction to obtain a water phase, and stirring the oil phase and the water phase in the inert gas environment to form an emulsion.
In the preparation method of the invention, the temperature of the polymerization reaction is controlled at 30-60 ℃, the pH value is controlled at 8-10, and the polymerization time is 4-8 hours.
The polymer emulsion for fracturing the oil and gas reservoir and the preparation method thereof have the following beneficial effects: according to the polymer emulsion for fracturing of the oil and gas reservoir, silicon dioxide nanoparticles are introduced into a polymer in a graft copolymerization mode, so that the effect of stabilizing the fluid is achieved, the viscosity retention rate of the viscoelastic fluid is improved, and the direct effect is embodied as that the using concentration of the polymer is lower; the formation of a pseudo filter cake is facilitated, the filtration loss of liquid is reduced, and the liquid efficiency of fracturing operation is increased; the silicon dioxide nano particles with positive charges can improve the zero shear viscosity, the longest relaxation time and the storage modulus of the solution to different degrees, and the direct effect is reflected in that the salt resistance of the polymer is better; the introduction of the silicon dioxide nano particles increases the hydrophobic property of a polymer system, and the fracturing fluid is more favorable for flowback after fracturing when used for oil well fracturing.
Drawings
FIG. 1 is a rheological profile of a 0.7% strength fracturing fluid formulated with the polymer emulsion of example 1 of the present invention; wherein, the fracturing fluid with the concentration of 0.7 percent refers to that the polymer emulsion of the example 1 and water are mixed according to the volume ratio of 0.7: 100 mixing the obtained fracturing fluid;
FIG. 2 is a rheological profile of a 1.0% strength fracturing fluid formulated with the polymer emulsion of example 2 of the present invention; wherein, the fracturing fluid with the concentration of 1.0% refers to the mixture of the polymer emulsion of the example 2 and water in a volume ratio of 1.0: 100 and mixing the obtained fracturing fluid.
Detailed Description
The polymer emulsion for fracturing hydrocarbon reservoirs and the preparation method thereof of the present invention are further illustrated below with reference to the following examples:
the invention relates to a novel silicon dioxide nano-oil polymer emulsion fracturing fluid for fracturing production-increasing measures, which is characterized in that a main agent is a copolymer formed by inverse emulsion polymerization, the polymer is innovatively grafted to the surface of nano-silicon dioxide in a graft copolymerization mode, and a nano-emulsion composition with the average particle size of less than or equal to 200nm is prepared, so that the lubricating property is better, the rapid dispersion and swelling performance of emulsion can be effectively improved, the hydrophobicity of emulsion particles is improved, the interface affinity is improved, and the modified system has the functions of displacing oil and changing the oil-water interface tension of a reservoir besides the performance of a conventional fracturing fluid system.
The polymer emulsion for fracturing of the oil and gas reservoir can be continuously mixed on line, has low damage and residue, resists temperature and salt and quickly tackifies. When in use, the water-soluble polymer can be tackified after being mixed with water for 5 to 10 seconds without preparing liquid in advance, the viscosity of the carried proppant can be achieved within 30 to 50 seconds, and the field use is very simple and convenient. The fracturing fluid has the advantages of improving the temperature resistance and salt tolerance of the fracturing fluid, more importantly, effectively improving the rapid dispersion and swelling performance of the emulsion, improving the hydrophobicity of emulsion particles and the interfacial affinity, so that the modified system has the functions of displacing oil and changing the oil-water interfacial tension of a reservoir besides the performance of a conventional fracturing fluid system. The polymerization method adopts an aqueous solution polymerization method, the polymerization process is stable, the molecular chain and molecular weight control are stable, and the polymerization degree is high. The reverse emulsion polymerization is adopted to finally form the emulsion of the polymer-in-oil, the particle size of the particles is nano-scale, the effect and the effectiveness of the polymer tackifying are greatly improved, and the polymer tackifying can be demulsified and tackified within about 5 to 10 seconds in actual use.
Example 1:
the total mass is calculated by 100 parts by mass, 28 parts of white oil, 801.6 parts of Tween, 601.6 parts of Span and 0.12 part of chelating agent are stirred and mixed uniformly to obtain an oil phase, 9.7 parts of acrylamide, 1 part of graft copolymer of acrylic ester and silicon dioxide, 9.7 parts of 2-acrylamide-2-methylpropanesulfonic acid, 9.7 parts of 2-methacryloyloxyethyl trimethyl ammonium chloride, 9.7 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.1 part of ammonium persulfate, 0.1 part of sodium bisulfite and the balance of water are stirred at 40 ℃ and then nitrogen is introduced for polymerization reaction for 7 hours. The oil and water phases are then stirred to form an emulsion.
Referring to FIG. 1, shear rate 100S at 170 deg.C-1Under the conditions, after shearing for 90min, the viscosity of the fracturing fluid with the concentration of 0.7% is kept at 40 mpa.s. Therefore, the fracturing fluid prepared from the polymer emulsion has very good temperature resistance and shear resistance.
Engineering application:
XX well of Ordos basin, horizontal well, gas well development, construction interval 3163.3 m-3737.5 m, fracturing fluid using this example, pump injection amount 5360m3Support dose 475.7m3The construction discharge capacity is 4.7-6.5m3Min, construction pressure of 39.37 MPa-46.84 MPa, and daily yield after fracturing of 716500m3/day。
Example 2:
the total mass is calculated according to 100 parts by mass, 30 parts of white oil, 801.8 parts of Tween, 601.8 parts of Span and 0.13 part of chelating agent are stirred and mixed evenly to obtain an oil phase, 9.1 parts of acrylamide, 1.2 parts of graft copolymer of acrylic ester and silicon dioxide, 9.1 parts of 2-acrylamide-2-methylpropanesulfonic acid, 9.1 parts of 2-methacryloyloxyethyl trimethyl ammonium chloride, 9.1 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.1 part of ammonium persulfate, 0.1 part of sodium bisulfite and the balance of water are stirred at 40 ℃ and then nitrogen is introduced for polymerization reaction for 6 hours. The oil and water phases are then stirred to form an emulsion.
Referring to FIG. 2, shear rate 100S at 170 deg.C-1Under the conditions, after shearing for 90min, the viscosity of the fracturing fluid with the concentration of 1.0% is kept at 43 mpa.s. Therefore, the fracturing fluid prepared from the emulsion polymer has very good temperature resistance and shear resistance.
Engineering application:
an XX well in an Eldoss basin, a horizontal well, a developed gas well, a construction well section of 3377.7-3949.6 m, a fracturing fluid using the embodiment, a pump injection amount of 5970m3, a supporting agent amount of 497.7m3 and a construction discharge amount of 4.5-6.5m3Min, construction pressure of 41.77 MPa-48.76 MPa, and daily yield after fracturing of 817000m without resistance flow3/day。
Example 3:
the total mass is calculated by 100 parts by mass, 21 parts of white oil, 801.6 parts of Tween, 602.4 parts of Span and 0.08 part of chelating agent are stirred and mixed uniformly to obtain an oil phase, 9 parts of acrylamide, 1 part of graft copolymer of acrylic ester and silicon dioxide, 9 parts of 2-acrylamide-2-methylpropanesulfonic acid, 9 parts of 2-methacryloyloxyethyl trimethyl ammonium chloride, 9 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.08 part of ammonium persulfate, 0.08 part of sodium bisulfite and the balance of water are stirred at 40 ℃, nitrogen is introduced, and polymerization reaction is carried out for 4 hours. The oil and water phases are then stirred to form an emulsion.
The polymer emulsion of this example was formulated into a fracturing fluid (not shown) at a concentration of 1.0% and a shear rate of 100S at 170 ℃. (not shown in the drawing)-1Under the conditions, after shearing for 90min, the viscosity of the fracturing fluid with the concentration of 1.0% is maintained at 42 mpa.s. Therefore, the fracturing fluid prepared from the emulsion polymer has very good temperature resistance and shear resistance.
Engineering application:
an XX well in an Eldoss basin, a horizontal well, a developed gas well, a construction well section of 3377.7-3949.6 m, a fracturing fluid using the embodiment, a pump injection amount of 5970m3, a supporting agent amount of 497.7m3 and a construction discharge amount of 4.8-6.6m3Min, construction pressure of 41.77 MPa-48.76 MPa, and daily yield after fracturing of 736000m without resistance flow3/day。
Example 4
The total mass is calculated by 100 parts by mass, 27 parts of white oil, 802.4 parts of Tween, 602.4 parts of Span and 0.12 part of chelating agent are stirred and mixed uniformly to obtain an oil phase, 12.3 parts of acrylamide, 5 parts of graft copolymer of acrylic ester and silicon dioxide, 11.8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 10.8 parts of 2-methacryloyloxyethyl trimethyl ammonium chloride, 10.8 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.12 part of ammonium persulfate, 0.12 part of sodium bisulfite and the balance of water are stirred at 40 ℃ and introduced with nitrogen, and polymerization reaction is carried out for 4 hours. The oil and water phases are then stirred to form an emulsion.
The polymer emulsion of this example was formulated into a fracturing fluid (not shown) at a concentration of 1.0% and a shear rate of 100S at 170 ℃. (not shown in the drawing)-1Under the condition, after shearing for 90min, the viscosity of the fracturing fluid with the concentration of 1.0 percent is maintainedAt 44 mpa.s. Therefore, the fracturing fluid prepared from the emulsion polymer has very good temperature resistance and shear resistance.
Engineering application:
XX well of Ordos basin, horizontal well, gas well development, construction interval 3163.3 m-3737.5 m, fracturing fluid using this example, pump injection amount 5360m3Support dose 475.7m3The construction discharge capacity is 4.4-6.4m3Min, construction pressure of 39.37 MPa-46.84 MPa, and daily yield after fracturing of 853200m3/day。
Comparative experimental example: (Note: comparative examples 1 to 4 correspond to the formulations of examples 1 to 4 one by one and are substantially the same, and the preparation method is the same, except that the only difference is that the silica is not grafted with the acrylate)
1. The polymer is used at lower concentration and has better viscoelasticity
2. Lower oil-water interfacial tension
3. Salt resistance
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings and are within the purview of the appended claims.
Claims (10)
1. The polymer emulsion for fracturing of the oil-gas reservoir is characterized by comprising acrylamide, a graft copolymer of acrylate and silicon dioxide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, an initiator, water, white oil, Tween80, Span60 and a chelating agent.
2. The polymer emulsion for fracturing oil and gas reservoirs according to claim 1, wherein the mass ratio of the acrylamide, the graft copolymer of the acrylate and the silicon dioxide, the 2-acrylamide-2-methylpropanesulfonic acid, the 2-methacryloyloxyethyl trimethyl ammonium chloride and the methacryloyloxyethyl trimethyl ammonium chloride is (9-12.3): (1-5): (9-11.8): (9-10.8): (9-10.8).
3. The polymer emulsion for fracturing of oil and gas reservoirs according to claim 2, wherein the mass ratio of the white oil, Tween80, Span60 and the chelating agent is (21-30): (1.6-2.4): (1.6-2.4): (0.08-0.13).
4. The polymer emulsion for fracturing oil and gas reservoirs according to claim 2, wherein the total mass of the acrylamide, the graft copolymer of acrylate and silica, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride is 30-60%.
5. The polymer emulsion for fracturing oil and gas reservoirs of claim 3, wherein each of said initiators comprises 0.08% to 0.12% of the total mass of the polymer emulsion.
6. The polymer emulsion for fracturing oil and gas reservoirs according to claim 5, wherein the acrylamide, the graft copolymer of acrylate and silica, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyltrimethyl ammonium chloride, the initiator and water are combined into an aqueous phase, the white oil, Tween80, Span60 and the chelating agent are combined into an oil phase, and the mass ratio of the oil phase to the aqueous phase is (25-32): (68-75).
7. The polymer emulsion for fracturing of hydrocarbon reservoirs according to claim 5, wherein the initiator comprises ammonium persulfate, azobisisobutyronitrile and/or sodium bisulfite.
8. The polymer emulsion for fracturing of hydrocarbon reservoirs according to claim 1, wherein the particle size of the polymer emulsion is 200nm or less.
9. A method of preparing a polymer emulsion according to any one of claims 1 to 8, comprising: stirring and mixing white oil, Tween80, Span60 and a chelating agent uniformly to obtain an oil phase, stirring acrylamide, a graft copolymer of acrylate and silicon dioxide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, an initiator and water in an inert gas environment for polymerization reaction to obtain a water phase, and stirring the oil phase and the water phase in the inert gas environment to form an emulsion.
10. The method of claim 9, wherein the polymerization temperature is controlled to 30-60 ℃, the pH is controlled to 8-10, and the polymerization time is 4-8 hours.
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Citations (10)
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