CN114621392B - High-temperature-resistant organosilicon polymer gel plugging agent, preparation method and application thereof - Google Patents
High-temperature-resistant organosilicon polymer gel plugging agent, preparation method and application thereof Download PDFInfo
- Publication number
- CN114621392B CN114621392B CN202011460958.0A CN202011460958A CN114621392B CN 114621392 B CN114621392 B CN 114621392B CN 202011460958 A CN202011460958 A CN 202011460958A CN 114621392 B CN114621392 B CN 114621392B
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- CN
- China
- Prior art keywords
- organosilicon
- solution
- plugging agent
- organosilicon polymer
- gel
- 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.)
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- 229920001558 organosilicon polymer Polymers 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 79
- 239000000178 monomer Substances 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 31
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 31
- 238000004132 cross linking Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 239000003431 cross linking reagent Substances 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 31
- 239000008367 deionised water Substances 0.000 claims description 19
- 229910021641 deionized water Inorganic materials 0.000 claims description 19
- -1 acrylic ester Chemical class 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000000047 product Substances 0.000 claims description 18
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000003999 initiator Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 229920005573 silicon-containing polymer Polymers 0.000 claims description 11
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-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 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 7
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-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
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 6
- 239000012263 liquid product Substances 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
- 238000000967 suction filtration Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 239000000872 buffer Substances 0.000 claims description 5
- 239000011790 ferrous sulphate Substances 0.000 claims description 5
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 5
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 claims description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- GGSUCNLOZRCGPQ-UHFFFAOYSA-N diethylaniline Chemical compound CCN(CC)C1=CC=CC=C1 GGSUCNLOZRCGPQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010528 free radical solution polymerization reaction Methods 0.000 claims description 4
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 4
- NELRINSZCVVEAD-UHFFFAOYSA-N chloro-ethenyl-methylsilane Chemical compound C[SiH](Cl)C=C NELRINSZCVVEAD-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000012966 redox initiator Substances 0.000 claims description 3
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 2
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 229940065472 octyl acrylate Drugs 0.000 claims description 2
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 claims description 2
- 239000007800 oxidant agent Substances 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 2
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 2
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 claims description 2
- 239000005050 vinyl trichlorosilane Substances 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims 3
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 4
- 230000000379 polymerizing effect Effects 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000000499 gel Substances 0.000 description 116
- 229920000642 polymer Polymers 0.000 description 63
- 239000000243 solution Substances 0.000 description 55
- 239000004576 sand Substances 0.000 description 22
- 239000000463 material Substances 0.000 description 19
- 239000012265 solid product Substances 0.000 description 16
- 230000035882 stress Effects 0.000 description 14
- 238000001291 vacuum drying Methods 0.000 description 13
- 239000000843 powder Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 239000003921 oil Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 230000004580 weight loss Effects 0.000 description 7
- KXDAEFPNCMNJSK-UHFFFAOYSA-N Benzamide Chemical compound NC(=O)C1=CC=CC=C1 KXDAEFPNCMNJSK-UHFFFAOYSA-N 0.000 description 6
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000004971 Cross linker Substances 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 4
- 229910002808 Si–O–Si Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 238000002329 infrared spectrum Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 4
- 238000002076 thermal analysis method Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000006172 buffering agent Substances 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000007863 gel particle Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- ARYZCSRUUPFYMY-UHFFFAOYSA-N methoxysilane Chemical class CO[SiH3] ARYZCSRUUPFYMY-UHFFFAOYSA-N 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- QLNJFJADRCOGBJ-UHFFFAOYSA-N propionamide Chemical compound CCC(N)=O QLNJFJADRCOGBJ-UHFFFAOYSA-N 0.000 description 2
- 229940080818 propionamide Drugs 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229960002317 succinimide Drugs 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000001757 thermogravimetry curve Methods 0.000 description 2
- 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 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- XFHJDMUEHUHAJW-UHFFFAOYSA-N n-tert-butylprop-2-enamide Chemical compound CC(C)(C)NC(=O)C=C XFHJDMUEHUHAJW-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000009491 slugging Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 235000011008 sodium phosphates Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011885 synergistic combination Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 238000005303 weighing 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
- 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
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
-
- 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
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to a high-temperature-resistant organosilicon polymer gel plugging agent, a preparation method and application thereof, and belongs to the technical field of drilling fluid plugging in the field of petroleum exploration and development. The organosilicon gel plugging agent is formed by crosslinking organosilicon polymers in water, wherein the organosilicon polymers are formed by polymerizing vinyl monomers and organosilicon monomers. The invention also provides a preparation method and application of the organosilicon polymer gel plugging agent. The organosilicon polymer gel plugging agent has controllable gel forming time, good temperature and pressure resistance, a use temperature condition of more than 150 ℃, a simple preparation method and low cost.
Description
Technical Field
The invention belongs to the technical field of drilling fluid plugging in the field of petroleum exploration and development, and particularly relates to a high-temperature-resistant organosilicon polymer gel plugging agent, a preparation method and application thereof.
Background
With the gradual exhaustion of conventional oil and gas resources, unconventional oil and gas resources such as heavy oil, oil sand, shale oil, shale gas, coalbed methane and the like are increasingly becoming hot points for development. The deep oil gas resource in China has wide distribution range and large reserves, and can be used as a main backup energy for relieving the contradiction between energy supply and demand in China. Deep reservoirs (Tarim, sichuan, bohai Bay, etc.) in China have a general depth of over 6000m, the deepest depth is 9000m, and the bottom hole temperature is 180-260 ℃. The ultra-deep well has the characteristics of high temperature and pressure, complex geological conditions (most of salt paste layers exist), multiple pressure layers exist in the same open hole section, and the like, and a target stratum in the drilling process contains multiple complex structures such as broken layers, cracks, karst holes and the like, so that quite serious lost circulation problems are often caused in the drilling operation process, the drilling construction progress can be seriously influenced, the operation cost is increased, multiple problems such as drilling fluid leakage, reservoir damage, wellhead collapse, drilling sticking, blowout and the like are easily caused, and even great influence is caused on deep oil and gas development.
For the treatment of lost circulation problems, the most critical part is to select plugging materials, and different types of materials such as fiber, particle and sheet are generally used for synergistic combination, so that a good treatment effect can be achieved for the lost circulation problems. However, the limitation of the conventional materials is obvious, and under the conditions of large and many cracks of the leakage layer, a good sealing layer is difficult to form around the shaft. At present, a chemical gelation plugging technology is adopted to achieve a very remarkable effect in the treatment process aiming at the lost circulation problem, but the treatment time and the control time of the gel are difficult to accurately grasp, so that the conditions of thermal degradation, syneresis and the like of the gel self temperature resistance are caused by the influence of the environment temperature of a high temperature layer, and the problems of gel viscosity reduction, strength great reduction and the like are finally caused.
Chinese patent document CN106928402a discloses a polymer gel formed from a polymer in water by physical effects such as van der waals forces, hydrogen bonding and electrostatic effects. The polymer is polymerized by adopting an acrylamide monomer and a hydrophobic monomer unit, and the provided polymer gel has low viscosity under high-speed shearing, has good injectability, and can ensure large-dose injection of a plugging control system; the water-flooding seepage-proofing agent has good shear recovery and higher viscoelasticity, so that the water-flooding seepage-proofing agent is stable in front edge slugging in a near wellbore zone, has high plugging success rate, can effectively change a subsequent water-flooding seepage path, and improves swept volume; has good temperature resistance and salt resistance and long-term stability. However, the polymer gel is adsorbed to clay by physical action such as van der Waals force, hydrogen bond and electrostatic action, and generally has heat resistance below 120 ℃, and the gel itself has thermal degradation, syneresis and the like due to the influence of the environmental temperature of the high temperature layer. In addition, the polymer gel has high viscosity average molecular weight (some polymer gels are more than 4000 ten thousand), which can cause macromolecular retention damage to the pore canal of the reservoir. The gel forming time of the gel is not easy to control, the stability is not ideal at the high temperature of more than 120 ℃, and the requirement of high-temperature stratum plugging can not be met.
The Chinese patent document CN106749899A discloses a preparation method of a polymer gel for high-temperature and high-salt profile control and water shutoff, which is prepared by polymerizing an acrylamide monomer, a methacrylamide monomer, an N-tertiary butyl acrylamide monomer, 2-acrylamide-2-methylpropanesulfonic acid and a modification auxiliary agent in the presence of an initiator, and properly adjusting the mole percent of a functional monomer and an amide group through designing a molecular main chain, so that the synthesized polymer is crosslinked under the condition of an extreme oil reservoir (the temperature is more than or equal to 110 ℃ and the mineralization degree is more than or equal to 10 ten thousand ppm) to form a gel with high strength and good thermal stability, the polymer has low viscosity average molecular weight (less than 1000 ten thousand), and the gel profile control and water shutoff agent formed by crosslinking with an organic crosslinking agent has high-temperature and high-salt resistance, freely controllable gel forming time, high gel strength and good thermal stability. However, the cross-linking agents of the liquid rubber plug are mainly organic cross-linking agents, the reaction process is that the active groups of the polymer and the cross-linking agents are subjected to condensation reaction to form stronger covalent bonds, so that gel system gel breaking is difficult under the high temperature condition, and the application range of the polymer gel liquid rubber plug is restricted.
The Chinese patent application CN 105567190A discloses a gel plugging agent in drilling plugging operation of an oil and gas field and a preparation method thereof, wherein the plugging agent is formed by copolymerizing four monomers, and a first monomer provides hydrophilicity for the plugging agent and promotes water absorption expansion of a material; the second monomer is a cationic monomer, and provides a positively charged group to increase the attraction between the plugging agent and the charges on the walls of the leakage pore canal; the third monomer is an unsaturated organic silicon coupling agent monomer, and the monomer can improve the retention capacity of the plugging agent at a leakage layer; the fourth monomer is a polyunsaturated functional monomer, so that the plugging agent forms chemical crosslinking. The invention adopts aqueous solution polymerization, has simple process and is convenient to operate. The plugging agent prepared by the invention has the advantages of strong water absorption expansion capability, and capability of improving the retention capability of a plugging material in a leakage layer due to the fact that the plugging agent contains a plurality of functional groups which can form mechanical interaction with the leakage layer, but the gel plugging agent does not pay attention to high temperature resistance.
Disclosure of Invention
Aiming at the defects and shortcomings of the existing gel plugging agent, the invention provides a high-temperature-resistant organosilicon polymer and an organosilicon polymer plugging material.
The invention also provides a preparation method of the high-temperature-resistant organosilicon polymer plugging material.
The invention also provides application of the high-temperature-resistant organosilicon polymer gel plugging agent.
The technical problems to be solved by the invention include, but are not limited to: the gel forming time of the existing gel plugging material is difficult to accurately master; the existing gel plugging material has insufficient temperature resistance, thermal degradation, syneresis and other conditions under high temperature conditions, and finally causes the problems of gel viscosity reduction, great strength reduction and the like.
The invention aims to synthesize an organosilicon polymer, avoid using an organic solvent, and preferably form an organosilicon monomer with a more compact space network structure. And the organic silicon polymer gel plugging material is developed by combining the characteristics of the organic silicon polymer material, so that the aim of effectively plugging crack pores under the conditions of high temperature and complex stratum structures is fulfilled. The organosilicon polymer gel plugging material has good viscoelasticity and shear dilutability; the gel forming time of the gel is controllable.
The invention achieves the aim by the following technical scheme.
The organosilicon polymer plugging material is formed by crosslinking organosilicon polymer in water, wherein the organosilicon polymer is formed by polymerizing vinyl monomer and organosilicon monomer; the vinyl monomer is a combination of acrylic acid or acrylic ester monomer and amide compound.
Preferably, the vinyl monomer content is 25% -35% based on the mass of the organosilicon polymer plugging material; the organosilicon monomer is 0.5% -2.0% of vinyl monomer.
The organic silicon monomer is one or more of methyl vinyl chlorosilane, vinyl trichlorosilane and gamma-methacryloxypropyl trimethoxy silane.
Preferably, the organosilicon monomer is gamma-methacryloxypropyl trimethoxysilane.
The acrylic ester monomer is one or more of Methyl Acrylate (MA), ethyl Acrylate (EA), butyl Acrylate (BA) and octyl acrylate (EHA);
preferably, the acrylic ester monomer is one or more of Methyl Acrylate (MA), ethyl Acrylate (EA) and Butyl Acrylate (BA);
still preferably, the acrylic ester monomer is one or more of Methyl Acrylate (MA) and Ethyl Acrylate (EA);
the amide compound is one or more of formamide, acetamide, propionamide, acrylamide, N-dimethylformamide, benzamide and succinimide.
Preferably, the amide compound is one or more of formamide, acrylamide, N-dimethylformamide, benzamide and succinimide.
Still preferably, the amide compound is one or more of formamide, acrylamide, N-dimethylformamide and benzamide.
Wherein the viscosity average molecular weight of the organosilicon polymer is 100-1000 ten thousand;
preferably, the silicone polymer has a viscosity average molecular weight of 100 to 500 ten thousand;
and still more preferably low, said silicone polymer having a viscosity average molecular weight of 150 to 250 ten thousand.
The invention also provides a high-temperature-resistant organosilicon polymer which is formed by polymerizing vinyl monomers and organosilicon monomers; the vinyl monomer is a combination of an acrylic acid or acrylate monomer and an amide compound.
The acrylic acid or acrylic ester monomer, the amide compound and the organosilicon monomer are selected as described above.
The preparation method of the high-temperature-resistant organosilicon polymer can adopt the prior art.
As a preferred technical scheme, the invention provides a preparation method of the following organosilicon polymer.
The preparation process of high temperature resistant organosilicon polymer includes polymerization of vinyl monomer and organosilicon monomer at 50-60 deg.c in the presence of initiator and buffering agent; the polymerization reaction is solution polymerization; wherein the initiator is a redox initiator combination selected from the group consisting of ammonium persulfate/sodium bisulfite, potassium persulfate/sodium bisulfite, ammonium persulfate/ferrous sulfate, hydrogen peroxide/ferrous sulfate, benzoyl peroxide/N, N-diethylaniline, potassium persulfate/silver nitrate, or persulfate/thiol combinations.
The initiator is used in an amount of 0.2% -0.5% of the total amount of the vinyl monomers.
The mol ratio of the oxidant to the reducer is 1-2:1-2.
The buffer is one or more of ethanol, acetic acid, sodium acetate, phosphoric acid and sodium phosphate.
The buffer is used in an amount of 0.1% -0.2% of the total amount of vinyl monomers.
The solution polymerization is carried out in a solvent, wherein the solvent is water; preferably deionized water.
The invention relates to a preparation method of an organosilicon polymer, which specifically comprises the following steps:
(1) Weighing vinyl monomer and fully dissolving in deionized water to obtain solution A;
(2) Dissolving an initiator and a buffer in deionized water to obtain a solution B;
(3) Adjusting the pH value of the solution A to 4-6 by using sodium hydroxide solution, adding an organosilicon monomer, then mixing with the solution B, and stirring to prepare a suspension;
(4) Stirring the suspension at a constant temperature of 50-60 ℃ for reacting for 6-8 hours to obtain a synthetic product;
(5) Repeatedly washing the synthesized product with absolute ethyl alcohol, and carrying out suction filtration and drying to obtain the organosilicon polymer.
The dissolving and mixing processes in the steps (1) to (3) are carried out under the condition of heating in a water bath at 24-26 ℃.
The stirring in the step (3) is carried out at a rotating speed of 150-300r/min for 20-35 minutes.
The mass concentration of the sodium hydroxide solution in the step (4) is 15-25%; preferably a sodium hydroxide solution with a mass concentration of 20%.
The constant temperature stirring rotating speed in the step (4) is 300-500r/min.
The step (4) can be deoxidized by adopting nitrogen before reaction, and condensation circulation can be adopted in the reaction process.
The suction filtration in the step (5) is to obtain a solid product by using a buchner funnel, and the drying is to place the solid product in a vacuum drying oven and dry the solid product for 6-8 hours at 45-55 ℃.
The amount of the absolute ethanol for washing in the step (5) is determined according to the requirement, and the stirring is continuously carried out until the precipitate is completely separated out.
The invention also provides a preparation method of the organosilicon gel plugging agent, which comprises the following steps:
(1) adding organosilicon polymer into deionized water under stirring to fully dissolve, and adjusting the pH value of the solution to 7 by using sodium hydroxide solution to obtain solution 1;
(2) slowly dripping a cross-linking agent into the solution 1, wherein the stirring speed is 800-1500r/min, and the stirring time is 10-15min; the addition amount of the cross-linking agent is 0.05-0.4% of the total amount of vinyl monomers, and the viscoelastic fluid is obtained, namely the liquid product of the organosilicon gel plugging agent.
The cross-linking agent is one or more of tetraethoxysilane, methyl orthosilicate, trimethoxysilane and acrylic ester compounds;
preferably, the cross-linking agent is one or more of tetraethoxysilane, trimethoxysilane and acrylic ester compounds;
still preferably, the cross-linking agent is one or more of tetraethoxysilane and acrylic acid ester compounds;
further preferably, the crosslinking agent is ethyl orthosilicate.
The dosage of the cross-linking agent is 1.0% -2.0% of the total amount of the vinyl monomers.
The organosilicon gel plugging agent liquid product can be directly applied as a plugging agent.
Further, in order to facilitate transportation and storage of the product and to control the polymer concentration during use, the product of the step (2) is subjected to the following post-treatment:
(3) placing the viscoelastic fluid in the step (2) in a vacuum drying oven, and keeping the temperature for 6-8 hours to obtain a solid product of the organosilicon gel plugging agent;
(4) and (3) taking out the solid product of the organosilicon gel plugging agent in the step (3), dividing the solid product into small blocks, placing the small blocks in a vacuum drying box, continuously drying at constant temperature for 24-36h, taking out the small blocks, and then performing powder manufacturing to obtain the powder product of the organosilicon gel plugging agent.
In the preparation of the organosilicon gel plugging agent, the stirring rotating speed in the step (1) is 150-300r/min.
The drying temperature of the vacuum drying oven in the step (3) is 50-60 ℃ and the vacuum pressure is 0.05-0.08MPa.
In the preparation of the organosilicon gel plugging agent, the cross-linking agent in the step (2) is the same as or different from the cross-linking agent in the preparation method of the organosilicon polymer. The cross-linking agent in the step (2) is selected from one or more of tetraethoxysilane, methyl orthosilicate, trimethoxysilane and acrylic ester compounds.
In some preferred embodiments, the crosslinking agent is dissolved in deionized water in advance when in use, and is configured into a solution with the mass concentration of 35-45%, so as to control the crosslinking speed.
The organosilicon gel plugging agent is a viscoelastic body, and the storage modulus and the energy consumption modulus are stable under the condition of stress change. At phase angles below 20 deg., the gel always has good viscoelasticity.
The application of the organosilicon polymer gel plugging agent as a water-based drilling fluid plugging agent comprises the steps of adding water into a prepared organosilicon gel plugging agent powder product or a prepared organosilicon gel plugging agent solid product to prepare fluid; preferably, the fluid is used in a concentration of 3 to 6wt.% based on the polymer mass.
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the preparation method of the invention introduces the organic silicon functional monomer when designing the main chain of the organic silicon polymer molecule, improves the thermal stability of the polymer, particularly controls the pH value of the reaction by adding a buffering agent in the synthesis process, controls the hydrolysis speed of the organic silicon monomer in aqueous solution, ensures that the organic silane in the polymer functional monomer can be hydrolyzed to generate silicon hydroxyl, and a part of silicon hydroxyl is condensed with each other to form a space network structure of Si-O-Si, has the characteristic of gel, has high viscoelasticity and shear recovery, generates an internal structure after low flow rate or standing and can be enhanced with time, thus being capable of being injected into the deep part of a stratum, and needing to be added with more external force to restore the flow or break through physical blockage and viscoelasticity, thereby plugging cracks.
Compared with the prior art, the method obtains the target product through free radical polymerization in the water solvent, avoids the damage to the stratum caused by subsequent application due to the use of the organic solvent, and effectively reduces the production cost. The invention uses buffering agent to control the hydrolysis speed of organosilicon monomer, which can overcome the relative technical problems. The acrylamide monomer in the polymer is a hydrophilic group, so that the polymer has good water solubility. The organic silicon monomer in the polymer has hydrophobic property and good temperature resistance, and the other part of silicon hydroxyl groups can also form Si-O-Si chemical bonds with silicon hydroxyl groups on the clay surface in the stratum, so that the adsorption strength of polymer molecules with the clay surface of the stratum under the high-temperature condition is increased; particularly preferred among them is gamma-methacryloxypropyl trimethoxy silane, C=C double bond on the main chain of the monomer is easy to copolymerize with other vinyl monomers, 3 methoxy silanes exist on the side chain, the adhesive force and durability are excellent after hydrolysis, the adsorption capacity of the polymer and clay surface can be greatly increased, and in addition, 3 methoxy silanes are crosslinked to form a more compact space network structure.
The organosilicon polymer is prepared into the gel plugging agent by secondary crosslinking in water through the crosslinking agent, so that the formed grid structure is more uniform, films are formed among chains, a main chain, branched chains and inter-chain films tend to form a three-dimensional space pore channel structure, the binding force to water is strongest, because the small molecular polymer is filled in the pores of a new polymer macromolecular grid to form a film shape, the film shape is plump in level, the binding capacity to water is stronger, larger deformation resistance is generated, the concentration-increased polymer is distributed in floccules, the viscosity-average molecular weight of the polymer is lower, the solubility is better, the gel plugging material formed by crosslinking shows low apparent viscosity at a high shear rate, has better viscoelasticity and shear dilutability, and is beneficial to pumping gel into a leakage layer. The temperature resistance of the plugging agent can reach more than 150 ℃ through further proof of temperature resistance experiments, the gel is determined to be viscoelastic fluid through gel viscoelastic evaluation, and the storage modulus and the energy consumption modulus are kept stable under the condition of stress change. At phase angles below 20 deg., the gel always has good viscoelasticity.
Aiming at the problems of the existing chemical gel plugging agent, the invention develops a novel organosilicon polymer gel plugging material which has the capabilities of high temperature resistance, strong stability and self-crosslinking, better viscoelasticity and shearing dilutability, controllable gel forming time and better temperature and pressure resistance. Therefore, the water-absorbing and water-expanding bridge plug can fully and smoothly enter the stratum fracture under the action of pressure difference, and the purpose of effectively plugging the fracture pores is achieved after a certain time.
The organosilicon monomer in the organosilicon polymer gel plugging agent has certain hydrophobic capacity, plays a role in supporting a macromolecular framework in a polymer, and enhances the toughness and stability of gel, thereby greatly improving the effective plugging time of gel particles to crack pores.
The organosilicon polymer gel particles do not influence the performance of drilling fluid, have simple preparation process and are suitable for field operation. The organosilicon polymer gel plugging agent is generally used at 80-150 ℃, and is still effective for the extreme oil reservoir condition above 150 ℃ and can reach 180 ℃ at most.
Drawings
FIG. 1 is an infrared spectrum of the silicone polymer synthesized in example 1.
FIG. 2 is an infrared spectrum of the silicone polymer gel prepared in example 2.
FIG. 3 is a thermogravimetric analysis of a silicone gel plugging agent.
FIG. 4 is a plot of leak-off versus pressure for different formation conditions.
FIG. 5 is a graph showing the amount of leakage versus pressure at various temperatures.
FIG. 6 is a graph showing the results of stress scans of silicone polymer gels prepared at different polymer concentrations and crosslinker loadings.
FIG. 7 is a plot of the frequency of silicone polymer gel prepared at varying polymer concentrations and crosslinker loadings.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other examples of modifications and alterations will be apparent to those skilled in the art based on the examples herein, and are intended to be within the scope of the invention.
Unless otherwise indicated, the percentages in the examples are mass percentages.
Example 1:
a preparation method of an organosilicon polymer comprises the following steps:
(1) Acrylic acid, acrylamide according to 2:3, fully dissolving the mixture in deionized water according to the molar ratio to obtain solution A;
(2) Absolute ethyl alcohol and tetraethoxysilane are mixed according to the weight ratio of 1:4 proportion is dissolved in deionized water, and initiator accounting for 0.2 percent of the total vinyl monomer is added, wherein the initiator is potassium persulfate and sodium bisulfite with the mole ratio of 1:1 to obtain a solution B;
(3) Adjusting the pH value of the solution A to 4 by using a pre-prepared 20% sodium hydroxide solution, and adding gamma-methacryloxypropyl trimethoxysilane accounting for 0.5% of the total mass of acrylic acid and acrylamide monomers to obtain a solution C; sequentially adding the solution C and the solution B into a three-neck flask, and stirring at a rotating speed of 300r/min for 30 minutes to prepare a suspension;
(4) Raising the stirring rotation speed to 500r/min, heating in water bath to the reaction temperature of 60 ℃, and reacting at constant temperature for 6 hours to obtain an organosilicon polymer synthetic product;
(5) Repeatedly washing the synthesized product by using absolute ethyl alcohol, carrying out suction filtration by using a Buchner funnel to obtain a solid product, and placing the solid product in a vacuum drying oven to dry for 6 hours at 50 ℃ to obtain the organosilicon polymer.
The IR spectrum of the organosilicon polymer synthesized in this example is shown in FIG. 1. The viscosity average molecular weight was 2004594.
Example 2:
the organosilicon gel plugging agent is prepared by carrying out secondary crosslinking on the organosilicon polymer in the embodiment 1. The amount of the crosslinking agent for secondary crosslinking was 0.1% of the total amount of vinyl monomers (acrylic acid+acrylamide).
The preparation method of the organosilicon gel plugging agent comprises the following steps:
(1) Adding the organosilicon polymer prepared in the example 1 into deionized water under the condition of low-speed stirring of 200-250 r/min to fully dissolve, preparing into polymer aqueous solution with the concentration of 6%, and regulating the pH of the solution to 7 by using a pre-prepared 20% sodium hydroxide solution to obtain solution 1;
(2) Slowly dripping 0.1% of cross-linking agent ethyl orthosilicate into the solution 1, increasing the stirring speed to 800r/min, stirring for 15min, and reacting at 70 ℃; the viscoelastic fluid is obtained, namely the liquid product of the organosilicon gel plugging agent.
(3) And (3) placing the viscoelastic fluid obtained in the step (2) in a vacuum drying oven, setting the constant temperature to be 50 ℃, setting the vacuum pressure to be 0.05MPa, and carrying out constant-temperature reaction for 6 hours to obtain the solid product of the organosilicon gel plugging agent.
(4) And (3) taking out the solid product of the organosilicon gel plugging agent obtained in the step (3), dividing the solid product into small blocks, placing the small blocks in a vacuum drying box, drying at the constant temperature of 50 ℃, taking out the small blocks after 24 hours, and obtaining the powder product of the organosilicon gel plugging agent after powder making.
The infrared spectrum of the organosilicon polymer gel plugging agent synthesized in the embodiment is shown in figure 1.
EXAMPLE 3 Effect of crosslinker addition on gel Forming Effect
As described in step (2) in example 2, the crosslinking agents with mass concentrations of 0.05%,0.1%,0.2%,0.3% and 0.4% were added respectively, and placed in a forced air drying oven, and the influence of the addition amount of the crosslinking agent on the gelling effect was examined, and the experimental conditions were: DVT-3 Brookfield viscometer, 70 ℃, 3r/min. When the viscosity exceeds 200 Pa.s, the completion of the sizing is represented, and the corresponding results are shown in the following Table 1.
TABLE 1 influence of the amount of crosslinker on the crosslinking time
The experimental results in table 1 show that: in the process of continuously increasing the addition amount of the cross-linking agent, the gel forming rate tends to be increased and then reduced, and the reason is that the cross-linking agent enables the linear polymer molecules to cross-link with each other to form a space network structure under the bridging action of covalent bonds or ionic bonds at a certain concentration. With the addition of the cross-linking agent, the gel forming rate gradually tends to be stable, the addition amount of the cross-linking agent is the optimal addition amount, however, the continuous increase of the addition amount of the cross-linking agent can cause the situation of excessive cross-linking of the whole gel system, and finally the stability of the whole system is reduced.
Example 4 influence of temperature on Polymer gel formation
An aqueous polymer solution having a mass fraction of 6.0% was prepared as described in step (1) of example 2, and a crosslinking agent having a mass fraction of 0.1% was added thereto as described in step (2) of example 2, and divided into 5 groups. The above solutions were placed in ovens at different temperatures, and the apparent viscosity of the polymer solution was measured with a DVT-3 Brookfield viscometer (number 64 rotor) at 3r/min, and when the apparent viscosity was greater than 200 Pa.s, indicating that the polymer gel formation was completed, the experimental results are shown in Table 2.
Table 2 effect of temperature on polymer gel formation.
As can be seen from table 2: the gel forming speed of the polymer solution can be rapidly increased along with the increase of the temperature, because the increase of the temperature can accelerate the migration rate of polymer molecules, the migration rate of macromolecular chains in the polymer solution becomes faster, the molecular chains of the polymer are stretched, and Si-OCH on the side chains of the polymer 3 The Si-O-Si bond formed after hydrolysis forms a molecular chain with a reticular structure, so that the interaction force between different chains is continuously improved, and the gel forming time is reduced to a great extent. The optimal temperature is found to be 70 ℃ in combination with the glue requirement.
Example 5 preparation method of organosilicon Polymer gel plugging agent
The method comprises the following steps:
(1) Methyl acrylate, N-dimethylformamide according to 4:3, fully dissolving the mixture in deionized water to obtain a solution A;
(2) Absolute ethyl alcohol and methyl orthosilicate are mixed according to the weight ratio of 1:4, dissolving the mixture in deionized water, and adding potassium persulfate/sodium bisulphite (the molar ratio is 1:2) accounting for 0.2 percent of the total amount of vinyl monomers to obtain a solution B;
(3) Adjusting the pH value of the solution A to 4 by using a pre-prepared 20% sodium hydroxide solution, and adding methyl vinyl chlorosilane accounting for 0.5% of the total mass of vinyl monomers to obtain a solution C; sequentially adding the solution C and the solution B into a three-neck flask, and stirring at a rotating speed of 300r/min for 30 minutes to prepare a suspension;
(4) Raising the stirring rotation speed to 500r/min, heating in water bath to the reaction temperature of 60 ℃, and reacting at constant temperature for 6 hours to obtain an organosilicon polymer synthetic product;
(5) Repeatedly washing the synthesized product by using absolute ethyl alcohol, carrying out suction filtration by using a Buchner funnel to obtain a solid product, and placing the solid product in a vacuum drying oven to dry for 6 hours at 50 ℃ to obtain the organosilicon polymer.
(6) Adding the organosilicon polymer prepared in the step (5) into deionized water under the condition of low-speed stirring at 200r/min to fully dissolve, preparing into polymer aqueous solution with the concentration of 6%, and regulating the pH of the solution to 7 by using a pre-prepared 20% sodium hydroxide solution to obtain solution 1;
(7) Slowly dripping a cross-linking agent methyl orthosilicate into the solution 1, increasing the stirring speed to 800r/min, stirring for 15min, and reacting at 70 ℃ with the cross-linking agent addition amount of 0.1% of the mass of the vinyl monomer to obtain viscoelastic fluid;
(8) Placing the viscoelastic fluid obtained in the step (7) in a vacuum drying box, setting the constant temperature to be 50 ℃, setting the vacuum pressure to be 0.05MPa, performing constant-temperature reaction for 6 hours, taking out and dividing the viscoelastic fluid into small blocks after preliminary drying, placing the small blocks in the vacuum drying box for constant-temperature drying, taking out the viscoelastic fluid after 24 hours, and performing powder making to obtain the organosilicon gel plugging agent powder.
The plugging properties of the silicone polymer gel plugging agent powder synthesized in this example are shown in Table 3.
Example 6 preparation method of organosilicon Polymer gel plugging agent
The method comprises the following steps:
(1) Butyl acrylate, propionamide according to 3:5, fully dissolving the mixture in deionized water according to the molar ratio to obtain solution A;
(2) Absolute ethyl alcohol and tetraethoxysilane are mixed according to the weight ratio of 1:4, dissolving the mixture in deionized water, and adding ammonium persulfate/ferrous sulfate (the molar ratio is 1:1) accounting for 0.2% of the total vinyl monomer to obtain a solution B;
(3) Adjusting the pH value of the solution A to 4 by using a pre-prepared 20% sodium hydroxide solution, and adding gamma-methacryloxypropyl trimethoxysilane accounting for 0.5% of the total mass of vinyl monomers to obtain a solution C; sequentially adding the solution C and the solution B into a three-neck flask, and stirring at a rotating speed of 300r/min for 30 minutes to prepare a suspension;
(4) Raising the stirring rotation speed to 500r/min, heating in water bath to the reaction temperature of 60 ℃, and reacting at constant temperature for 6 hours to obtain an organosilicon polymer synthetic product;
(5) Repeatedly washing the synthesized product by using absolute ethyl alcohol, carrying out suction filtration by using a Buchner funnel to obtain a solid product, and drying the solid product in a vacuum drying oven at 50 ℃ for 6 hours to obtain an organosilicon polymer;
(6) Adding the organosilicon polymer prepared in the step (5) into deionized water under the condition of low-speed stirring at 200r/min to fully dissolve, preparing into polymer aqueous solution with the concentration of 6%, and regulating the pH of the solution to 7 by using a pre-prepared 20% sodium hydroxide solution to obtain solution 1;
(7) Slowly dripping a crosslinking agent trimethoxy silane into the solution 1, increasing the stirring speed to 800r/min, stirring for 15min, and reacting at 70 ℃ with the crosslinking agent addition amount of 0.1% of the mass of the vinyl monomer to obtain a viscoelastic fluid;
(8) Placing the viscoelastic fluid obtained in the step (7) in a vacuum drying box, setting the constant temperature to be 50 ℃, setting the vacuum pressure to be 0.05MPa, performing constant-temperature reaction for 6 hours, taking out and dividing the viscoelastic fluid into small blocks after preliminary drying, placing the small blocks in the vacuum drying box for constant-temperature drying, taking out the viscoelastic fluid after 24 hours, and performing powder making to obtain the organosilicon gel plugging agent powder.
The plugging properties of the organosilicon polymer gel plugging agent synthesized in this example are shown in Table 3.
Table 3 evaluation of plugging properties of the silicone polymer gel plugging agent
Experimental example: evaluation of product Performance
The silicone gel plugging agent prepared in example 2 was characterized and evaluated for performance.
1. Characterization of organosilicon gel plugging agent
1. Thermal analysis
In mettleertoledo thermogravimetric and simultaneous thermal analysis (TGA), an aluminum crucible is used with a purge flow rate of50mL·min -1 The Thermogravimetric (TGA) analysis was performed on the silicone gel plugging agent solid powder at a nitrogen atmosphere and an initial heating temperature of 40 ℃. The initial temperature of the thermal analysis was 40℃and the final temperature was 800℃and the TGA curve is shown in FIG. 3.
For TGA curves (fig. 3), when the temperature is between 40 ℃ and 165 ℃, the stage belongs to the first stage of thermal degradation, and the corresponding weight loss rate is 10.4%, which is mainly caused by water loss after the water in the polymer is heated, and is essentially caused by that the polymer itself is considered to be added with structural monomers with hydrophilic properties in the design process, so that the water absorption condition of the polymer itself occurs. When the temperature is in the range of 165 ℃ to 649 ℃, the second stage of thermal degradation is represented, the corresponding weight loss ratio is 19.6%, and the key point of mass loss is that the influence of the temperature on the polymer further causes the phase change of the polymer; for the range of 310 ℃ to 426 ℃ in the interval, the corresponding weight loss rate is 29.6%, and when the temperature condition is in the range, the polymer itself is gradually degraded corresponding to the side chain; the weight loss rate at the 426-649 ℃ stage is 15.1%, and the weight loss at this stage is due to the gradual degradation of the main chain of the polymer molecule. In the case of temperatures ranging from 649 ℃ to 800 ℃, then belonging to the third stage, the weight loss of the polymer at this temperature is 16.8% and this is probably mainly due to the fact that the polymer main chain is decomposed due to the high temperature, the final polymer being only 8.5% of the initial mass size after the thermal analysis experiment. The main reason for the weight loss of the polymer is that the internal molecules of the polymer itself are combined with water vapor to initiate the polymerization. In the low-temperature stage, the polymer has high heat resistance because the bonding force of the C-N bond, the C-C bond and the like is high. But at temperatures exceeding 310 c the polymer backbone will start to break, degrading. Meanwhile, as the gamma-MPS hydrophobic monomer long side chain and the AM macromolecule side group are introduced into the molecular chain, the heat resistance and stability of the polymer are improved to a great extent.
2. Infrared spectrometry
The organosilicon gel plugging agent and potassium bromide are uniformly mixed according to a certain proportion and then are mixed in 2MPressing under Pa for 5min to obtain sheet, and measuring at 400-4000cm with IR-TRACER-100 infrared spectrophotometer -1 An absorption spectrum in the infrared region is obtained in the wavenumber range.
FIG. 2 shows that the molecular structure of the organosilicon gel plugging agent material is determined to contain all structural functional groups of reactants, and the organosilicon gel plugging agent material is a target product. As can be seen by comparing the analysis of FIG. 1 with the analysis of FIG. 2, FIG. 2 is at 1210cm -1 Characteristic peaks of asymmetric stretching vibration of Si-O appear, which prove that the plugging agent generates Si-O-Si bond after secondary crosslinking and original Si-OH hydrolysis and condensation.
3. Performance measurement
3.1 evaluation of leakage blocking Performance
3.1.1 Sand bed test leakage of different mesh numbers
The plugging performance of the organosilicon gel plugging agent is evaluated by the following method: the method is characterized in that the method comprises the steps of carrying out indoor evaluation through sand bed experiments, namely, 250g of sand barrels are respectively filled with sand stones with different mesh numbers, flattening and compacting the sand stones by using a die after filling, so as to simulate loose and easy-to-leak loose stratum, adding the completely-glued plugging agent into 4.0% drilling fluid base slurry, pouring the slurry into the sand barrels, opening a top valve and adjusting the pressure after the temperature reaches experimental setting conditions, recording the total fluid loss of 10min, measuring the depth of liquid in the sand barrels which invades the sand beds by using a steel rule if no fluid loss exists, wherein the fluid loss is the lowest in each group of experiments, or representing the best plugging effect when the sand beds have the minimum fluid invasion depth, and carrying out research analysis on plugging bearing capacity at different temperatures for different pressures, so as to evaluate the plugging performance of the gel. The leakage conditions of different stratum are simulated by means of sand with different mesh numbers, the leakage loss change state of the plugging agent under different pressures is researched and tested, and the concrete result is shown in figure 4.
The experimental results show that: the leakage amount of the sand bed experiments with different mesh numbers rises along with the increase of pressure, and the leakage amount is relatively smaller when the mesh number of the sand bed is larger, because the gap simulated by the sand bed is smaller when the mesh number is larger, and the leakage is difficult to occur. For the sand bed model experimental group with 10-20 meshes, when the pressure is increased, the leakage amount is increased continuously, and the main reason is that the leakage gap of the leakage layer is bigger, so that the leakage condition occurs, and the leakage amount of 10min is only 2.13mL although the leakage amount is bigger in the 3 groups of sand bed simulation leakage layers. In comparison, the 20-40 mesh sand bed simulation experiment group is provided with the experiment pressure ranging from 1MPa to 5MPa, and the leakage amount is kept unchanged in the pressure lifting process at the moment, so that the leakage blocking agent is best matched with the stratum gap in the 20-40 mesh range, is easier to enter a leakage layer to be matched with a leakage channel, and blocks the leakage channel through the adhesion effect, and when the pressure is increased to 6-7 MPa, the leakage amount continuously rises due to the fact that the pressure is larger. For a sand bed simulation experiment group with 40-60 meshes, no leakage occurs when the pressure is less than 2.4 MPa; when the pressure is more than 3MPa, the leakage amount increases along with the increase of the pressure, because the gap of the sand bed with 40-60 meshes is smaller, the leakage is difficult to occur when the pressure is smaller, the leakage amount rapidly rises when the pressure is increased to 3-4 MPa, and the leakage amount basically keeps unchanged when the pressure range is 4-6 MPa, because the gel is squeezed into the gap of the sand bed along with the increase of the pressure, and leakage channels are blocked through adhesion. Sand bed experiments prove that the gel plugging material has higher pressure-bearing plugging capability.
3.1.2 plugging Properties at different temperature conditions
The plugging performance of the organosilicon gel plugging agent under the high temperature condition is evaluated through a high Wen Shachuang experiment, the relevance between the plugging agent closing temperatures is researched by means of setting of different temperatures, the plugging agent closing temperatures are simulated by means of sand with 10 meshes to 20 meshes, the testing temperatures are respectively 30 ℃,80 ℃ and 150 ℃, the accumulated leakage amount of 10 minutes is recorded, and the corresponding relation between the pressure closing leakage amounts under different temperature conditions is shown in figure 5.
The experimental results show that: during the temperature rise, the initial fluid loss will rise continuously, thus it can be demonstrated that the rise in temperature will affect the initial plugging performance of the gel. When the temperature is 30 ℃, the leakage amount slowly rises along with the increase of the pressure; when the temperature is 80 ℃ and 140 ℃, the accumulated leakage amount for 10min is increased and then reduced in the process of continuously increasing the pressure, and the main reason is that gel cannot completely enter a gap to form leakage stoppage in a smaller pressure state, and after the pressure is increased, the gel enters a leakage layer gap simulated by a sand bed to form effective leakage stoppage under the action of the pressure, and when the pressure is increased from 6MPa to 7MPa, the leakage amount is basically unchanged, so that the gel has formed complete leakage stoppage. Therefore, when the pressure is 7MPa, the leakage amount of 10min at 30 ℃ in the sand-simulated leakage layer of 10-20 meshes is 2mL, the leakage amount of 10min at 80 ℃ is 2.5mL, and the leakage amount of 10min at 180 ℃ is 3mL. High Wen Shachuang experiments prove that the gel plugging material still has good plugging performance under the high-temperature condition.
3.2 evaluation of gel viscoelasticity of organosilicon gel plugging agent
The gel is formed by interconnecting high polymers in a polymer solution under certain conditions to form a space network structure, and the viscosity is increased to reduce the fluidity of the polymer, so that the uniform appearance of the system is ensured. The property shown by the elastomer is that the strain develops along with time and has elasticity, when the elastomer is subjected to external stress, the stress is converted into elastic deformation, and when the stress is removed, the strain is gradually reduced, and the fluid is gradually restored to the original shape; for viscous fluids, the effect of stress on the fluid itself will be converted to thermal energy of the fluid itself, e.g., if the stress is relieved, the fluid will remain unchanged. By gel, it is meant a fluid in an intermediate state between a viscous fluid and an elastic fluid, which can be measured by means of viscoelasticity for the ability of the gel to displace fluids from the formation. For elastic fluids, according to the formula tan δ=g "/G', the closer G"/G is to 0, the stronger the elasticity of the gel, and when the phase angle δ is not more than 20 °, the storage modulus is greater than the energy dissipation modulus when the gel is in the linear viscoelastic region, i.e., tan δ < 1.
Adding water to prepare an organosilicon polymer solution with mass fractions of 5.0% and 6.0% according to the step (1) of the polymer in the embodiment 2, respectively adding a cross-linking agent with mass fractions of 0.1% and 0.2% into the solution, placing the solution into a constant temperature oven with a temperature of 70 ℃ for gelling, and using a HAAKE RS6000 rheometer to perform stress and frequency scanning of gel at 30 ℃, wherein the experimental conditions of stress scanning are as follows: the fixed frequency is 1Hz, and the stress amplitude is 0.1-100 Pa; the experimental conditions for frequency sweep were: the fixed stress was 1Pa, the vibration frequency was 0.01 to 15Hz, and the experimental results were shown in FIG. 6 and FIG. 7.
As can be seen from fig. 6: the crosslinking agent has little influence on the viscoelasticity of the gel system, the addition of the polymer has great influence on the viscoelasticity of the gel, and the viscoelasticity of the gel is obviously enhanced along with the increase of the addition of the polymer from 5% to 6%. At 1Hz, the stress is less than 75Pa, the gel is a viscoelastic fluid, and the energy consumption modulus G 'and the storage modulus G' are not changed basically along with the change of the shearing stress.
As can be seen from fig. 7: when the stress is 1.0Pa and the corresponding vibration frequency is 0.01-15Hz, the energy storage modulus and the energy consumption modulus are continuously improved when the vibration frequency is continuously improved, and the potential angle delta can be found to be always smaller than 20 DEG in the frequency range of the experiment through calculation, so that the gel can be inferred to belong to a linear viscoelastic region in the range, and the gel has good viscoelasticity under the condition.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. An organosilicon polymer gel plugging agent is characterized in that: the organosilicon polymer gel plugging agent is prepared by crosslinking organosilicon polymer in water, and the organosilicon polymer is polymerized by vinyl monomer and organosilicon monomer; the vinyl monomer is a combination of acrylic acid or acrylic ester monomer and amide compound;
the organic silicon monomer is one or more of methyl vinyl chlorosilane, vinyl trichlorosilane and gamma-methacryloxypropyl trimethoxy silane;
the acrylic ester monomer is one or more of methyl acrylate, ethyl acrylate, butyl acrylate and octyl acrylate; the amide compound is acrylamide;
the preparation method of the organosilicon polymer comprises the steps of carrying out polymerization reaction on vinyl monomers and organosilicon monomers at 50-60 ℃ in the presence of an initiator and a buffer; the polymerization reaction is solution polymerization;
the preparation method of the organosilicon polymer gel plugging agent comprises the following steps:
(1) adding organosilicon polymer into deionized water for full dissolution, and adjusting the pH value of the solution to 6-8 by using sodium hydroxide solution to obtain solution 1;
(2) adding a cross-linking agent into the solution 1 and stirring; the addition amount of the cross-linking agent is 0.05-0.4% of the total amount of vinyl monomers, and the viscoelastic fluid is obtained, namely the liquid product of the organosilicon polymer gel plugging agent;
the cross-linking agent in the step (2) is selected from one or more of tetraethoxysilane, tetramethylsilicate and trimethoxysilane;
the vinyl monomer content is 25% -35% based on the mass of the liquid product of the organosilicon polymer gel plugging agent; the organic silicon monomer accounts for 0.5% -2.0% of the vinyl monomer.
2. The silicone polymer gel plugging agent of claim 1, wherein: the initiator is a redox initiator combination; the redox initiator combination is one of ammonium persulfate/sodium bisulfite, potassium persulfate/sodium bisulfite, ammonium persulfate/ferrous sulfate, hydrogen peroxide/ferrous sulfate, benzoyl peroxide/N, N-diethylaniline, potassium persulfate/silver nitrate or persulfate/mercaptan oxidation combination; the initiator is used in an amount of 0.2-0.5% of the total amount of vinyl monomers; the molar ratio of the oxidant to the reducer in the initiator is 1-2:1-2.
3. The silicone polymer gel plugging agent of claim 1, wherein: the preparation method of the organosilicon polymer specifically comprises the following steps:
(1) Fully dissolving vinyl monomer in deionized water to obtain solution A;
(2) Dissolving an initiator, a cross-linking agent and a buffer in deionized water to obtain a solution B;
(3) Adjusting the pH value of the solution A to 4-6 by using sodium hydroxide solution, adding an organosilicon monomer, then mixing with the solution B, and stirring to prepare a suspension;
(4) Stirring the suspension at a constant temperature of 50-60 ℃ for reacting for 6-8 hours to obtain a synthetic product;
(5) Repeatedly washing the synthesized product obtained in the step (4) with absolute ethyl alcohol, and carrying out suction filtration and drying to obtain the organosilicon polymer.
4. A method for preparing the organosilicon polymer gel plugging agent according to claim 1, which is characterized in that: the method comprises the following specific steps:
(1) adding organosilicon polymer into deionized water for full dissolution, and adjusting the pH value of the solution to 6-8 by using sodium hydroxide solution to obtain solution 1;
(2) adding a cross-linking agent into the solution 1 and stirring; the addition amount of the cross-linking agent is 0.05-0.4% of the total amount of vinyl monomers, and the viscoelastic fluid is obtained, namely the liquid product of the organosilicon polymer gel plugging agent;
the dissolution in the step (1) is carried out under low-speed stirring, and the rotating speed of the low-speed stirring is 150-300r/min; the cross-linking agent in the step (2) is dissolved in deionized water in advance when in use, and is prepared into a solution with the mass concentration of 35-45%; the stirring speed in the step (2) is 800-1500r/min.
5. Use of a silicone polymer gel plugging agent according to any one of claims 1-3 or prepared according to the method of claim 4 as a water-based drilling fluid plugging agent.
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