CN117534789B - Polyacrylamide suspension emulsion for fracturing and preparation method thereof - Google Patents
Polyacrylamide suspension emulsion for fracturing and preparation method thereof Download PDFInfo
- Publication number
- CN117534789B CN117534789B CN202410032226.3A CN202410032226A CN117534789B CN 117534789 B CN117534789 B CN 117534789B CN 202410032226 A CN202410032226 A CN 202410032226A CN 117534789 B CN117534789 B CN 117534789B
- Authority
- CN
- China
- Prior art keywords
- suspension emulsion
- stirring
- polyacrylamide
- fracturing
- sodium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229920002401 polyacrylamide Polymers 0.000 title claims abstract description 49
- 239000000839 emulsion Substances 0.000 title claims abstract description 47
- 239000000725 suspension Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 239000003999 initiator Substances 0.000 claims abstract description 30
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 24
- FMQPBWHSNCRVQJ-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-yl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C(F)(F)F)C(F)(F)F FMQPBWHSNCRVQJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- BCAIDFOKQCVACE-UHFFFAOYSA-N 3-[dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azaniumyl]propane-1-sulfonate Chemical compound CC(=C)C(=O)OCC[N+](C)(C)CCCS([O-])(=O)=O BCAIDFOKQCVACE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- KKFHAJHLJHVUDM-UHFFFAOYSA-N n-vinylcarbazole Chemical compound C1=CC=C2N(C=C)C3=CC=CC=C3C2=C1 KKFHAJHLJHVUDM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 13
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 13
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 13
- 239000000391 magnesium silicate Substances 0.000 claims abstract description 13
- 229910052919 magnesium silicate Inorganic materials 0.000 claims abstract description 13
- 235000019792 magnesium silicate Nutrition 0.000 claims abstract description 13
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000012153 distilled water Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 239000000337 buffer salt Substances 0.000 claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 239000000243 solution Substances 0.000 claims description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 6
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 6
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical group [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 6
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 4
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 4
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 4
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 4
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 4
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 4
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 4
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 4
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 3
- JMGZBMRVDHKMKB-UHFFFAOYSA-L disodium;2-sulfobutanedioate Chemical compound [Na+].[Na+].OS(=O)(=O)C(C([O-])=O)CC([O-])=O JMGZBMRVDHKMKB-UHFFFAOYSA-L 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 239000000047 product Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000003786 synthesis reaction Methods 0.000 abstract description 5
- 239000006227 byproduct Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- -1 TX-10 Chemical compound 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 15
- 239000000178 monomer Substances 0.000 description 10
- 238000010008 shearing Methods 0.000 description 7
- 239000002562 thickening agent Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- 239000000375 suspending agent Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 229920001059 synthetic polymer Polymers 0.000 description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 2
- QABCGOSYZHCPGN-UHFFFAOYSA-N chloro(dimethyl)silicon Chemical compound C[Si](C)Cl QABCGOSYZHCPGN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229960003280 cupric chloride Drugs 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000005580 one pot reaction Methods 0.000 description 2
- 229920001938 Vegetable gum Polymers 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 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
- 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
-
- 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
-
- 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
- C09K2208/28—Friction or drag reducing additives
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)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention belongs to the technical field of petroleum exploitation, and particularly relates to polyacrylamide suspension emulsion for fracturing and a preparation method thereof. The preparation method comprises the following steps: adding acrylamide, N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate, hydroxypropyl methylcellulose, magnesium silicate, TX-10, MS-1, a catalyst, buffer salt and distilled water into a four-neck flask with a condenser, regulating the pH value, and stirring to obtain a uniform emulsion; and (3) adding an initiator into the dropping funnel, slowly dropping the initiator into the four-neck flask, continuing stirring, heating, keeping warm, stirring, continuing heating, keeping warm, stirring, adjusting the pH value, and cooling to obtain the product polyacrylamide suspension emulsion. The invention has the advantages of wide raw material sources, simple synthesis process and no byproducts; meanwhile, the invention has the characteristics of high viscosity and high resistivity reduction.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, relates to a high molecular polymer and a preparation method thereof, and in particular relates to polyacrylamide suspension emulsion for fracturing and a preparation method thereof.
Background
The most effective method for improving the output of the old oil field without damaging the oil reservoir is to perform fracturing construction on the stratum, and the aim is to press the stratum into cracks, so that the yield is increased. The fracturing fluid used in fracturing must have the characteristics of high viscosity, high shear resistance, high strength sand carrying property, no residue in breaking gel, environmental protection and the like.
The polymers for the fracturing fluid used at home and abroad at present are natural vegetable gums and derivatives thereof, cellulose and derivatives thereof, and synthetic polymers. Compared with the prior art, the synthetic polymer has better viscosity-temperature characteristic and high-temperature stability, and has the advantages of good stability and strong sand carrying capacity. The common synthetic polymers include polyacrylamide, methylene polyacrylamide and the like, the properties of the polymers can be changed by controlling the synthesis conditions, construction requirements are met, the resistance reduction performance is good, but the problems such as higher friction force of the pipeline in the process of migration exist. Therefore, research and development of a plurality of polymers with high molecular weight, which have excellent salt tolerance, higher apparent viscosity, good shearing resistance and higher plugging strength, become chasing directions of a plurality of scientific researchers, and particularly, molecular modification of polyacrylamide fracturing fluid to become an profile control polymer with excellent performance is a hot spot direction for improving the fracturing technology in the future.
The invention patent CN111019042A discloses a high-temperature resistant thickener for fracturing fluid, a preparation method and application thereof, and the thickener comprises the high-temperature resistant thickener for fracturing fluid, and is characterized in that the thickener comprises acrylamide, a salt-resistant functional monomer and a temperature-sensitive functional monomer free radical; the molar ratio of the acrylamide to the salt-resistant functional monomer to the temperature-sensitive functional monomer is 1: (0.01-0.08): (0.05-0.15). According to the invention, a temperature-sensitive unit and a salt-resistant unit are introduced into an acrylamide molecular chain in a solution copolymerization mode, so that the copolymer is endowed with excellent high temperature resistance and salt resistance, and simultaneously has good solubility, viscoelasticity and sand carrying property. The invention provides a fracturing fluid polymer which is applicable to a high-temperature high-pressure environment at 200 ℃, but the fracturing fluid thickener has poor stability because the fracturing fluid polymer does not actually solve the problem of fracture of cross-linking bonds of the fracturing fluid at high temperature.
The invention patent CN105542073B discloses a preparation method of polyacrylamide for polymer flooding oil extraction, which comprises the following specific steps: uniformly mixing a cationic monomer, acrylamide, trimethylol methylamine, a surfactant and water, and then introducing nitrogen into the mixed solution; adding an initiator, heating, keeping the reaction, cooling, adding hydroxyethyl acrylate and dimethylchlorosilane into the mixture, adjusting the pH of a reaction system, heating, keeping the reaction, taking out the obtained gelatinous product after the reaction is finished, and obtaining a polyacrylamide product through cutting, drying, granulating and sieving. According to the invention, through adjusting the monomer reaction sequence of the modified polyacrylamide during polymerization, cationic monomers and acrylamide are partially polymerized, and then hydroxyethyl acrylate and dimethylchlorosilane are subjected to polymerization reaction continuously, the prepared modified polyacrylamide has the effect of increasing viscosity in a solution with high ion concentration. However, the viscosity of the polymer for fracturing of the present invention is only about 30 mPas when the polymer is used at a concentration of 1500 mg/L.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a suspension emulsion resistance reducing agent for fracturing fluids and a preparation method thereof. The invention has the advantages of wide raw material sources, simple synthesis process and no byproducts; meanwhile, the invention has the characteristics of high viscosity and high resistivity reduction.
To achieve the above and other related objects, the present invention is achieved by the following technical solutions:
the first aspect of the invention provides a polyacrylamide suspension emulsion for fracturing, which has the following molecular structural formula:
,
wherein:
a=20000-200000；
b=5000-100000；
c=2000-40000；
d=5000-100000。
preferably, the viscosity average molecular weight of the polyacrylamide suspension emulsion is 10000000-25000000.
The second aspect of the invention provides a preparation method of the polyacrylamide suspension emulsion for fracturing, which comprises the following specific steps:
(1) Adding acrylamide, N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate, hydroxypropyl methylcellulose, magnesium silicate, TX-10 (alkylphenol ethoxylate), MS-1 (alkylphenol ether sulfosuccinate sodium salt), a catalyst, buffer salt and distilled water into a four-neck flask with a condenser, purging with nitrogen for 2-3min, isolating oxygen, adjusting pH to 7-8 with sodium hydroxide solution, and stirring to obtain a uniform emulsion;
(2) Adding an initiator into a dropping funnel, slowly dropping the initiator into a four-neck flask, continuously stirring for 60-80min after the dropping is finished, heating to 45-50 ℃, keeping the temperature and stirring for 30-60min, heating to 75-80 ℃, keeping the temperature and stirring for 30-60min, regulating the pH value to 7-8 by using a sodium hydroxide solution, and cooling to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
In the present invention, preferably, the molar ratio of the N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate to acrylamide is 0.2 to 0.4:0.1-0.2:0.2-0.4:1.
more preferably, the molar ratio of the N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate to acrylamide is 0.2-0.3:0.1-0.15:0.2-0.3:1.
in the present invention, preferably, in the step (1), the weight ratio of the hydroxypropyl methylcellulose, magnesium silicate, TX-10, MS-1, catalyst, buffer salt, distilled water and acrylamide is 0.05-0.1:0.02-0.05:0.02-0.04:0.03-0.06:0.01-0.02:0.05-0.1:5-6:1.
in the present invention, preferably, in the step (1), the catalyst is copper sulfate or copper chloride.
In the present invention, preferably, in the step (1), the buffer salt is one of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate and disodium hydrogen phosphate.
In the present invention, preferably, in the step (2), the initiator is an aqueous solution of persulfate and a reducing agent, wherein the persulfate is one of potassium persulfate, ammonium persulfate and sodium persulfate, and the concentration is 6-10wt%; the reducing agent is one of sodium bisulphite, sodium sulfite and sodium thiosulfate, and the concentration is 3-5wt%.
In the present invention, preferably, in the step (2), the weight ratio of the initiator to the acrylamide is 0.3 to 0.5:1.
the synthetic reaction equation of the polyacrylamide suspension emulsion for fracturing is as follows:
,
,
compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The polyacrylamide suspension emulsion for fracturing is a quaternary high polymer taking acrylamide as a polymerization monomer and [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide and hexafluoroisopropyl methacrylate as a functional monomer. The vinylcarbazole belongs to a rigid structure, and strength and shearing resistance of the whole molecule are enhanced. [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide belongs to an amphoteric surfactant, can reduce surface tension and interfacial tension, improve wettability and permeability, enable the whole molecule to be in seamless close contact with the surface of rock, greatly improve the blocking rate of a large pore canal of a stratum, play a role in fracturing profile control, improve the polymerization degree of other monomers, increase the molecular weight of a polymer and strengthen the viscosity of the whole molecule. The hexafluoroisopropyl methacrylate can greatly reduce surface tension and interfacial tension, reduce frictional resistance during product migration in the fracturing process, reduce energy consumption and reduce external shearing force on the product. Hydroxypropyl methylcellulose and magnesium silicate belong to dispersing agents, TX-10 and MS-1 belong to emulsifying dispersing agents, and the aim of adding is to improve the polymerization quality.
(2) The polyacrylamide suspension emulsion has higher apparent viscosity, and the concentration apparent viscosity of 0.5wt% is more than 91 mPa.s; has higher shearing resistance and apparent viscosity of more than 85 mPa.s; has better resistance-reducing effect, and the resistance-reducing rate is more than 74 percent.
(3) The polyacrylamide suspension emulsion is synthesized into a one-pot method, raw materials are easy to obtain, the synthesis process is simple, and no byproducts are generated.
Detailed Description
Other advantages and effects of the present invention will become readily apparent to those skilled in the art from the following disclosure, when considered in light of the following detailed description of the invention. The invention may be practiced or carried out in other embodiments that depart from the specific details disclosed herein and that may be modified or varied from the spirit and scope of the present invention.
The invention is further illustrated by the following examples:
example 1 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.4mol of N-vinylcarbazole, 0.15mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.2mol of hexafluoroisopropyl methacrylate, 3.55g of hydroxypropyl methylcellulose, 3.55g of magnesium silicate, 1.42g of TX-10, 2.88g of MS-1, 0.71g of copper sulfate, 3.55g of potassium dihydrogen phosphate, 384g of distilled water, purged with nitrogen for 2 minutes, oxygen was isolated, and pH7-8 was adjusted with sodium hydroxide solution, followed by stirring to a uniform emulsion;
(2) Adding 21.3g of initiator into a dropping funnel, slowly dripping the initiator into a four-neck flask, continuously stirring for 60min after dripping, heating to 45 ℃, keeping the temperature and stirring for 50min, heating to 75 ℃, keeping the temperature and stirring for 30min, regulating the pH to 7-8 by using sodium hydroxide solution, and cooling to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
Example 2 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.35mol of N-vinylcarbazole, 0.15mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.25mol of hexafluoroisopropyl methacrylate, 4.18g of hydroxypropyl methylcellulose, 3.18g of magnesium silicate, 1.88g of TX-10, 3.46g of MS-1, 0.98g of copper sulfate, 4.18g of potassium dihydrogen phosphate, 388g of distilled water, purged with nitrogen for 2 minutes to isolate oxygen, and pH7 to 8 was adjusted with sodium hydroxide solution to be stirred into a uniform emulsion;
(2) 24.5g of initiator is added into a dropping funnel, the initiator contains 8wt% of potassium persulfate and 3.5wt% of sodium sulfite, the initiator is slowly dripped into a four-neck flask, the dripping is completed, stirring is continued for 60min, the temperature is raised to 50 ℃, the temperature is kept for 55min, the temperature is raised to 80 ℃, the temperature is kept for 60min, the pH is regulated to 7-8 by sodium hydroxide solution, and the temperature is lowered to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
Example 3 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.3mol of N-vinylcarbazole, 0.1mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.3mol of hexafluoroisopropyl methacrylate, 6.33g of hydroxypropyl methylcellulose, 1.42g of magnesium silicate, 1.94g of TX-10, 3.33g of MS-1, 1.13g of copper sulfate, 7.1g of dipotassium hydrogen phosphate, 426g of distilled water, purged with nitrogen for 3 minutes to isolate oxygen, and pH7-8 was adjusted with sodium hydroxide solution to be stirred into a uniform emulsion;
(2) 28.8g of initiator is added into a dropping funnel, the initiator contains 10wt% of sodium persulfate and 4wt% of sodium bisulphite, the initiator is slowly added into a four-mouth flask in a dropwise manner, the stirring is continued for 70min after the completion of the dropwise addition, the temperature is raised to 50 ℃, the stirring is kept at the temperature for 45min, the temperature is raised to 76 ℃, the stirring is kept at the temperature for 35min, the pH value is regulated to 7-8 by a sodium hydroxide solution, and the temperature is lowered to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
Example 4 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.3mol of N-vinylcarbazole, 0.15mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.35mol of hexafluoroisopropyl methacrylate, 5.27g of hydroxypropyl methylcellulose, 1.64g of magnesium silicate, 1.99g of TX-10, 2.13g of MS-1, 1.42g of copper sulfate, 6.13g of dipotassium hydrogen phosphate, 374g of distilled water, purged with nitrogen for 3 minutes to isolate oxygen, and pH7-8 was adjusted with sodium hydroxide solution to be stirred into a uniform emulsion;
(2) Adding 33.2g of initiator into a dropping funnel, slowly dropping the initiator into a four-neck flask, continuously stirring for 65min after the completion of the dropping, heating to 45 ℃, keeping the temperature and stirring for 50min, heating to 77 ℃, keeping the temperature and stirring for 40min, regulating the pH to 7-8 by using sodium hydroxide solution, and cooling to below 40 ℃ to obtain the product polyacrylamide suspension emulsion.
Example 5 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.25mol of N-vinylcarbazole, 0.2mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.35mol of hexafluoroisopropyl methacrylate, 5.27g of hydroxypropyl methylcellulose, 1.64g of magnesium silicate, 1.99g of TX-10, 2.13g of MS-1, 0.85g of cupric chloride, 6.24g of sodium dihydrogen phosphate, 355g of distilled water, purged with nitrogen for 2 minutes, oxygen was isolated, and pH7-8 was adjusted with sodium hydroxide solution, followed by stirring to a uniform emulsion;
(2) 32.4g of initiator is added into a dropping funnel, the initiator contains 6wt% of potassium persulfate and 3wt% of sodium bisulphite, the initiator is slowly added into a four-mouth flask in a dropwise manner, the stirring is continued for 80min after the completion of the dropwise addition, the temperature is raised to 46 ℃, the stirring is kept at the temperature for 40min, the temperature is raised to 78 ℃, the stirring is kept at the temperature for 45min, the pH value is regulated to 7-8 by using sodium hydroxide solution, and the temperature is lowered to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
Example 6 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.2mol of N-vinylcarbazole, 0.15mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.4mol of hexafluoroisopropyl methacrylate, 7.1g of hydroxypropyl methylcellulose, 2.71g of magnesium silicate, 2.84g of TX-10, 3.88g of MS-1, 0.92g of cupric chloride, 5.88g of sodium dihydrogen phosphate, 404g of distilled water, purged with nitrogen for 3 minutes to isolate oxygen, and pH7-8 was adjusted with sodium hydroxide solution to be stirred into a uniform emulsion;
(2) 31.4g of initiator is added into a dropping funnel, the initiator contains 9wt% of potassium persulfate and 4wt% of sodium bisulphite, the initiator is slowly added into a four-mouth flask in a dropwise manner, the stirring is continued for 75min after the completion of the dropwise addition, the temperature is raised to 47 ℃, the stirring is kept for 30min, the temperature is raised to 79 ℃, the stirring is kept for 50min, the pH value is regulated to 7-8 by a sodium hydroxide solution, and the temperature is lowered to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
Example 7 (1) A four-necked flask equipped with a condenser was charged with 1mol of acrylamide, 0.25mol of N-vinylcarbazole, 0.2mol of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, 0.4mol of hexafluoroisopropyl methacrylate, 6.88g of hydroxypropyl methylcellulose, 2.87g of magnesium silicate, 2.33g of TX-10, 4.14g of MS-1, 1.17g of copper chloride, 5.76g of disodium hydrogen phosphate, 398g of distilled water, purged with nitrogen for 2 minutes, oxygen was isolated, and pH7-8 was adjusted with sodium hydroxide solution, followed by stirring to a uniform emulsion;
(2) 35.5g of initiator is added into a dropping funnel, the initiator contains 9wt% of potassium persulfate and 3wt% of sodium bisulphite, the initiator is slowly added into a four-mouth flask in a dropwise manner, the stirring is continued for 70min after the completion of the dropwise addition, the temperature is raised to 48 ℃, the stirring is kept at the temperature for 60min, the temperature is raised to 80 ℃, the stirring is kept at the temperature for 55min, the pH value is regulated to 7-8 by using sodium hydroxide solution, and the temperature is lowered to below 40 ℃ to obtain the polyacrylamide suspension emulsion.
Example 8 apparent viscosity test
The apparent viscosity of the oil-displacing agent is tested at 50 ℃ by diluting 2000mg/L sodium chloride aqueous solution into 0.5wt% concentration solution and referring to SYT 6376-2008 general technical Condition for fracturing fluids, and the test results are shown in Table 1 by taking the partially hydrolyzed polyacrylamide suspending agent for oil displacement in the open-air sea source chemical industry for three times as a comparison example.
As can be seen from table 1: the apparent viscosity of the polyacrylamide suspension emulsion for fracturing (examples 1-7) of the invention is more than 91 mPas and up to 102 mPas (example 1) at a concentration of 0.5wt%, while the apparent viscosity of the high-temperature fracturing fluid thickener of the partially hydrolyzed polyacrylamide suspension agent for the source chemical three-time oil displacement of the comparative example Puyang city sea is 46 mPas and is obviously lower than that of the invention.
Example 9 evaluation of shear resistance
The invention is diluted into a solution with the concentration of 0.5wt% by using 2000mg/L sodium chloride aqueous solution, the shearing resistance is tested at 50 ℃ by referring to SYT 6376-2008 general technical Condition for fracturing fluids, and the test results are shown in Table 1 by using the partially hydrolyzed polyacrylamide suspending agent for three oil displacement in the source chemical industry of Puyang city.
As can be seen from table 1: the polyacrylamide suspension emulsions for fracturing (examples 1-7) of the invention have a shear resistance of more than 85 mPas, up to 95 mPas (example 1) after shearing at a concentration of 0.5wt% and a temperature of 50 ℃, whereas the partially hydrolyzed polyacrylamide suspension for the three-time displacement of oil in the source chemical industry of the cationic city of comparative example has a shear viscosity of 38 mPas, which is significantly lower than that of the invention.
Example 10 resistivity test
The invention is diluted into a solution with the concentration of 0.5wt% by using 2000mg/L sodium chloride aqueous solution, the resistivity is tested by referring to SYT 6376-2008 general technical Condition for fracturing fluids, and the partially hydrolyzed polyacrylamide suspending agent for the three oil displacement in the source chemical industry of Puyang city is used as a comparison example, and the test results are shown in Table 1.
TABLE 1 apparent viscosity, shear resistance and resistivity test results
,
As can be seen from table 1: the polyacrylamide suspension emulsion for fracturing (examples 1-7) provided by the invention has the resistivity at the concentration of 0.5wt percent, the resistivity is more than 74 percent and up to 80 percent (examples 6 and 7), and the resistivity of the high-temperature fracturing fluid thickening agent of the partially hydrolyzed polyacrylamide suspension agent for the source chemical three-time oil displacement of the Puyang city sea is 52 percent, which is obviously lower than that of the invention.
In conclusion, the polyacrylamide suspension emulsion has higher apparent viscosity, higher shearing resistance and better resistance reducing effect. Meanwhile, the polyacrylamide suspension emulsion is synthesized into a one-pot method, raw materials are easy to obtain, the synthesis process is simple, and no byproducts are generated.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent variation, modification and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical scheme of the present invention.
Claims (10)
1. The preparation method of the polyacrylamide suspension emulsion for fracturing is characterized by comprising the following specific steps of:
(1) Adding acrylamide, N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate, hydroxypropyl methylcellulose, magnesium silicate, alkylphenol ethoxylates, alkylphenol ether sulfosuccinate sodium salt, a catalyst, buffer salt and distilled water into a four-neck flask with a condenser, purging with nitrogen for 2-3min, isolating oxygen, regulating pH to 7-8 with sodium hydroxide solution, and stirring to obtain a uniform emulsion;
(2) Adding an initiator into a dropping funnel, slowly dropping the initiator into a four-neck flask, continuously stirring for 60-80min after the dropping is finished, heating to 45-50 ℃, keeping the temperature and stirring for 30-60min, heating to 75-80 ℃, keeping the temperature and stirring for 30-60min, regulating the pH value to 7-8 by using a sodium hydroxide solution, and cooling to below 40 ℃ to obtain the polyacrylamide suspension emulsion;
the molar ratio of the N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate and acrylamide is 0.2-0.4:0.1-0.2:0.2-0.4:1.
2. the method for preparing the polyacrylamide suspension emulsion for fracturing according to claim 1, wherein the molar ratio of the N-vinylcarbazole, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide, hexafluoroisopropyl methacrylate and acrylamide is 0.2-0.3:0.1-0.15:0.2-0.3:1.
3. the method for preparing the polyacrylamide suspension emulsion for fracturing according to claim 1, wherein in the step (1), the weight ratio of the hydroxypropyl methylcellulose, magnesium silicate, alkylphenol ethoxylates, alkylphenol ether sulfosuccinate sodium salt, catalyst, buffer salt, distilled water and acrylamide is 0.05-0.1:0.02-0.05:0.02-0.04:0.03-0.06:0.01-0.02:0.05-0.1:5-6:1.
4. the method of claim 1, wherein in step (1), the catalyst is copper sulfate or copper chloride.
5. The method of claim 1, wherein in the step (1), the buffer salt is one of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate, and disodium hydrogen phosphate.
6. The method for preparing the polyacrylamide suspension emulsion for fracturing according to claim 1, wherein in the step (2), the initiator is an aqueous solution of persulfate and a reducing agent, and the weight ratio of the initiator to the acrylamide is 0.3-0.5:1.
7. the method for preparing the polyacrylamide suspension emulsion for fracturing according to claim 6, wherein the persulfate is one of potassium persulfate, ammonium persulfate and sodium persulfate, and the concentration is 6-10wt%.
8. The method for preparing the polyacrylamide suspension emulsion for fracturing according to claim 6, wherein the reducing agent is one of sodium bisulphite, sodium sulfite and sodium thiosulfate, and the concentration is 3-5wt%.
9. The polyacrylamide suspension emulsion for fracturing is characterized in that the molecular structural formula of the quaternary high molecular polymer of the polyacrylamide suspension emulsion is as follows:
，
wherein:
a=20000-200000；
b=5000-100000；
c=2000-40000；
d=5000-100000。
10. the polyacrylamide suspension emulsion for fracturing according to claim 9, wherein said quaternary polymer of said polyacrylamide suspension emulsion has a viscosity average molecular weight of 10000000-25000000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410032226.3A CN117534789B (en) | 2024-01-10 | 2024-01-10 | Polyacrylamide suspension emulsion for fracturing and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410032226.3A CN117534789B (en) | 2024-01-10 | 2024-01-10 | Polyacrylamide suspension emulsion for fracturing and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117534789A CN117534789A (en) | 2024-02-09 |
| CN117534789B true CN117534789B (en) | 2024-03-26 |
Family
ID=89792330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410032226.3A Active CN117534789B (en) | 2024-01-10 | 2024-01-10 | Polyacrylamide suspension emulsion for fracturing and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117534789B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122220A (en) * | 2021-04-26 | 2021-07-16 | 北京富达鑫辉能源科技有限公司 | Variable-viscosity fracturing fluid and preparation method thereof |
| CN115785335A (en) * | 2022-12-22 | 2023-03-14 | 西南石油大学 | Anti-drag thickening agent for high-sand-carrying easy-flowback water-based fracturing fluid and preparation method and application thereof |
| CN117069888A (en) * | 2023-10-12 | 2023-11-17 | 胜利油田方圆化工有限公司 | Polymer thickener for salt-resistant fracturing and synthesis method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106497537A (en) * | 2016-10-25 | 2017-03-15 | 长江大学 | A kind of while " two-in-one " hydraulic fracturing liquid system with drag reduction and solid-carrying performance |
-
2024
- 2024-01-10 CN CN202410032226.3A patent/CN117534789B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122220A (en) * | 2021-04-26 | 2021-07-16 | 北京富达鑫辉能源科技有限公司 | Variable-viscosity fracturing fluid and preparation method thereof |
| CN115785335A (en) * | 2022-12-22 | 2023-03-14 | 西南石油大学 | Anti-drag thickening agent for high-sand-carrying easy-flowback water-based fracturing fluid and preparation method and application thereof |
| CN117069888A (en) * | 2023-10-12 | 2023-11-17 | 胜利油田方圆化工有限公司 | Polymer thickener for salt-resistant fracturing and synthesis method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117534789A (en) | 2024-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109705834B (en) | Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition and preparation method of thickening agent | |
| CN107189774B (en) | Sand-carrying anti-drag bidirectional fracturing fluid | |
| CN108299592B (en) | 3-methacrylamide dopamine and acrylamide mixed polymer and preparation method and application thereof | |
| CN116285936B (en) | High-temperature-resistant salt-resistant instant fracturing fluid thickener and preparation method thereof | |
| CN113651931A (en) | Ultra-high temperature modified polymer cementing fluid loss agent and preparation method and application thereof | |
| CN115572347A (en) | High-temperature-resistant high-salt-resistant tackifying and shearing-improving agent for water-based drilling fluid and preparation method and application thereof | |
| CN115594798A (en) | Oil field fracturing fluid thickening agent and preparation method and application thereof | |
| CN114262412A (en) | Anti-shearing modified polyacrylamide and application thereof | |
| CN117534789B (en) | Polyacrylamide suspension emulsion for fracturing and preparation method thereof | |
| CN113929801B (en) | Preparation method of thickener for ultrahigh-temperature acidizing and fracturing | |
| CN114195961A (en) | Rigid nanoparticle modified polyacrylamide | |
| CN115873173B (en) | Nano polymer microsphere for profile control and flooding and preparation method thereof | |
| CN116751337B (en) | Thickening agent for acidizing fracturing and synthesis method thereof | |
| CN111116635B (en) | Modified nano graphite and polymer composite material thereof, preparation method and application in high-temperature high-salinity oil reservoir | |
| CN110790859B (en) | Acrylamide copolymer and preparation method and application thereof | |
| CN114214048B (en) | High-temperature-resistant suspension stabilizer for well cementation working fluid and preparation method thereof | |
| CN115785336A (en) | Preparation method of amphiphobic polymer containing acylhydrazone bond and nano amphiphobic reversal agent | |
| CN113150210B (en) | Acrylamide and methyl propanesulfonic acid copolymer fracturing fluid and preparation method thereof | |
| CN110790860B (en) | Acrylamide copolymer and preparation method and application thereof | |
| CN117866141B (en) | Temperature-resistant and salt-resistant polyacrylamide for oil displacement and synthesis method thereof | |
| CN116874661B (en) | Polymer polyacrylamide for tertiary oil recovery and preparation method thereof | |
| CN117820547B (en) | Polyacrylamide for oil displacement and preparation method thereof | |
| CN114426637B (en) | Hydrophobic association polymer for water shutoff and profile control as well as preparation method and application thereof | |
| CN117229456A (en) | Anionic polyacrylamide for oil extraction and preparation method thereof | |
| CN116426257B (en) | Fluid loss agent and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |