CN114479793B - Composite plugging agent and preparation method and application thereof - Google Patents
Composite plugging agent and preparation method and application thereof Download PDFInfo
- Publication number
- CN114479793B CN114479793B CN202011166418.1A CN202011166418A CN114479793B CN 114479793 B CN114479793 B CN 114479793B CN 202011166418 A CN202011166418 A CN 202011166418A CN 114479793 B CN114479793 B CN 114479793B
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- China
- Prior art keywords
- plugging agent
- composite plugging
- starch
- gamma
- monomer
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- 239000002131 composite material Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 72
- 239000002245 particle Substances 0.000 claims abstract description 42
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 229920000642 polymer Polymers 0.000 claims abstract description 34
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 8
- 229920001577 copolymer Polymers 0.000 claims abstract description 3
- 229920002472 Starch Polymers 0.000 claims description 80
- 239000008107 starch Substances 0.000 claims description 78
- 235000019698 starch Nutrition 0.000 claims description 78
- 239000000178 monomer Substances 0.000 claims description 35
- 238000005553 drilling Methods 0.000 claims description 24
- 229920002554 vinyl polymer Polymers 0.000 claims description 16
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 229920001971 elastomer Polymers 0.000 claims description 10
- 239000005060 rubber Substances 0.000 claims description 10
- 239000002734 clay mineral Substances 0.000 claims description 9
- OXYZDRAJMHGSMW-UHFFFAOYSA-N 3-chloropropyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)CCCCl OXYZDRAJMHGSMW-UHFFFAOYSA-N 0.000 claims description 8
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 8
- -1 diallyl propane sulfonate Chemical compound 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 229920002261 Corn starch Polymers 0.000 claims description 7
- 239000008120 corn starch Substances 0.000 claims description 7
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 7
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 7
- 229920000728 polyester Polymers 0.000 claims description 7
- OOXSLJBUMMHDKW-UHFFFAOYSA-N trichloro(3-chloropropyl)silane Chemical compound ClCCC[Si](Cl)(Cl)Cl OOXSLJBUMMHDKW-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 6
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052622 kaolinite Inorganic materials 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 5
- 125000000129 anionic group Chemical group 0.000 claims description 5
- 125000002091 cationic group Chemical group 0.000 claims description 5
- 239000007822 coupling agent Substances 0.000 claims description 5
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229920001592 potato starch Polymers 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 4
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 3
- JHUFGBSGINLPOW-UHFFFAOYSA-N 3-chloro-4-(trifluoromethoxy)benzoyl cyanide Chemical compound FC(F)(F)OC1=CC=C(C(=O)C#N)C=C1Cl JHUFGBSGINLPOW-UHFFFAOYSA-N 0.000 claims description 3
- LVNLBBGBASVLLI-UHFFFAOYSA-N 3-triethoxysilylpropylurea Chemical compound CCO[Si](OCC)(OCC)CCCNC(N)=O LVNLBBGBASVLLI-UHFFFAOYSA-N 0.000 claims description 3
- AERFECJVKFIHED-UHFFFAOYSA-N 4-ethenylpyridin-1-ium;propane-1-sulfonate Chemical compound CCCS([O-])(=O)=O.C=CC1=CC=[NH+]C=C1 AERFECJVKFIHED-UHFFFAOYSA-N 0.000 claims description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 3
- 241000196324 Embryophyta Species 0.000 claims description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 3
- 244000017020 Ipomoea batatas Species 0.000 claims description 3
- 235000002678 Ipomoea batatas Nutrition 0.000 claims description 3
- 240000002853 Nelumbo nucifera Species 0.000 claims description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 3
- 239000004113 Sepiolite Substances 0.000 claims description 3
- 240000004922 Vigna radiata Species 0.000 claims description 3
- 235000010721 Vigna radiata var radiata Nutrition 0.000 claims description 3
- 235000011469 Vigna radiata var sublobata Nutrition 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 229960000892 attapulgite Drugs 0.000 claims description 3
- 229920002301 cellulose acetate Polymers 0.000 claims description 3
- IOMDIVZAGXCCAC-UHFFFAOYSA-M diethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](CC)(CC)CC=C IOMDIVZAGXCCAC-UHFFFAOYSA-M 0.000 claims description 3
- 239000011487 hemp Substances 0.000 claims description 3
- 229910052900 illite Inorganic materials 0.000 claims description 3
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims description 3
- 229910052625 palygorskite Inorganic materials 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 229910052624 sepiolite Inorganic materials 0.000 claims description 3
- 235000019355 sepiolite Nutrition 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 claims description 3
- KSCAZPYHLGGNPZ-UHFFFAOYSA-N 3-chloropropyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)CCCCl KSCAZPYHLGGNPZ-UHFFFAOYSA-N 0.000 claims description 2
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- 235000003283 Pachira macrocarpa Nutrition 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 240000001085 Trapa natans Species 0.000 claims description 2
- 235000014364 Trapa natans Nutrition 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- KRJRKEPWQOASJN-UHFFFAOYSA-N aniline;trimethoxy(methyl)silane Chemical compound NC1=CC=CC=C1.CO[Si](C)(OC)OC KRJRKEPWQOASJN-UHFFFAOYSA-N 0.000 claims description 2
- ZGCZDEVLEULNLJ-UHFFFAOYSA-M benzyl-dimethyl-(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].C=CC(=O)OCC[N+](C)(C)CC1=CC=CC=C1 ZGCZDEVLEULNLJ-UHFFFAOYSA-M 0.000 claims description 2
- ZDOBWJOCPDIBRZ-UHFFFAOYSA-N chloromethyl(triethoxy)silane Chemical compound CCO[Si](CCl)(OCC)OCC ZDOBWJOCPDIBRZ-UHFFFAOYSA-N 0.000 claims description 2
- RQAKESSLMFZVMC-UHFFFAOYSA-N n-ethenylacetamide Chemical compound CC(=O)NC=C RQAKESSLMFZVMC-UHFFFAOYSA-N 0.000 claims description 2
- ZQXSMRAEXCEDJD-UHFFFAOYSA-N n-ethenylformamide Chemical compound C=CNC=O ZQXSMRAEXCEDJD-UHFFFAOYSA-N 0.000 claims description 2
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 claims description 2
- 235000009165 saligot Nutrition 0.000 claims description 2
- SKNFSJNMUVGDKH-UHFFFAOYSA-M sodium 3-methyl-2-prop-2-enoyloxybut-1-ene-1-sulfonate Chemical compound C(C=C)(=O)OC(=CS(=O)(=O)[O-])C(C)C.[Na+] SKNFSJNMUVGDKH-UHFFFAOYSA-M 0.000 claims description 2
- 229940100445 wheat starch Drugs 0.000 claims description 2
- 239000001530 fumaric acid Substances 0.000 claims 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 28
- 229920000578 graft copolymer Polymers 0.000 description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 238000001035 drying Methods 0.000 description 17
- 238000003756 stirring Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 15
- 239000007864 aqueous solution Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000003960 organic solvent Substances 0.000 description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 9
- 239000008367 deionised water Substances 0.000 description 9
- 229910021641 deionized water Inorganic materials 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 239000002002 slurry Substances 0.000 description 8
- 239000000725 suspension Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 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 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 3
- 235000017060 Arachis glabrata Nutrition 0.000 description 2
- 244000105624 Arachis hypogaea Species 0.000 description 2
- 235000010777 Arachis hypogaea Nutrition 0.000 description 2
- 235000018262 Arachis monticola Nutrition 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 2
- 240000007049 Juglans regia Species 0.000 description 2
- 235000009496 Juglans regia Nutrition 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 2
- 235000020232 peanut Nutrition 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 235000020234 walnut Nutrition 0.000 description 2
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- CADWTSSKOVRVJC-UHFFFAOYSA-N benzyl(dimethyl)azanium;chloride Chemical compound [Cl-].C[NH+](C)CC1=CC=CC=C1 CADWTSSKOVRVJC-UHFFFAOYSA-N 0.000 description 1
- GQVVQDJHRQBZNG-UHFFFAOYSA-N benzyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)CC1=CC=CC=C1 GQVVQDJHRQBZNG-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- FZGFBJMPSHGTRQ-UHFFFAOYSA-M trimethyl(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCOC(=O)C=C FZGFBJMPSHGTRQ-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- 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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a composite plugging agent, which comprises a polymer component, a fiber component and an elastic particle component; based on the total weight of the composite plugging agent, the polymer component content is 30-60 wt%, the fiber component content is 20-40 wt% and the elastic particle component content is 20-40 wt%. The polymer includes structural units A, B and D, wherein structural units a and D form a copolymer via a crosslinking agent. The preparation method of the composite plugging agent is to uniformly mix the polymer component, the fiber component and the elastic particle component. The plugging agent has the advantages of good high temperature resistance, high pressure bearing capacity, environmental protection in production and application and the like.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a plugging material and a preparation method thereof.
Background
The occurrence rate of lost circulation worldwide accounts for 20% -25% of the total number of well drilling, and the economic loss of the global petroleum industry caused by lost circulation is hundreds of millions of dollars each year, so the research of plugging agents is a current hot spot. The plugging material is indispensable in the process of well drilling leakage prevention, and the success rate of well drilling leakage prevention and plugging is directly dependent on the performance of the plugging material. Therefore, the research of the plugging material has very important significance.
Well leakage exists to different degrees in the Chinese oil and gas drilling process, and is more serious particularly when a fractured stratum is drilled. Therefore, an effective well leak-proof and plugging technique must be implemented, and the basic material necessary for implementing the technique is a plugging material. The plugging material with the most widely application and lower cost at present is bridging plugging. In the conventional bridging plugging method, the plugging success rate is only 40-60% in the field implementation process, and the analysis of the cause of the plugging success rate mainly comprises the following aspects: 1. the size of the crack opening of the leakage layer is large, the particle size of the leakage stopping material is small, particularly the particle size of the hard particle material is small, and bridge plugs are difficult to form in the crack by bridging. 2. The crack opening size is small, and when bridging is plugged, the large particle material forms a door sealing phenomenon at the crack opening, so that the small particle material is prevented from entering to form a bridge plug, and the bridge plug is plugged on the surface, but in the subsequent drilling construction, the large particle material of the door sealing breaks away from the crack opening and is leaked again under the actions of drilling tool collision, liquid flow flushing, pulling and hanging, sucking and the like. Therefore, in the drilling engineering, sometimes, the plugging agent formula cannot be optimized and determined because the width of the crack and the size of the pore of the lost stratum cannot be accurately mastered, thereby increasing the uncertainty of successful construction and reducing the plugging success rate.
CN101955763a is a high pressure resistant plugging agent and plugging slurry containing the high pressure resistant plugging agent, the high pressure resistant plugging agent is composed of soybean particles, walnut shell powder, vermiculite, peanut shell powder, cement and flocculating coating agent LHB-105 for drilling fluid, the mass percentage content is: 25.0 to 27.0 percent of soybean particles, 31.0 to 32.0 percent of walnut shell powder, 7.1 to 7.5 percent of vermiculite, 2.1 to 2.5 percent of peanut shell powder, 22.0 to 22.5 percent of cement and 10.0 to 11.0 percent of flocculating coating agent LHB-105 for drilling fluid. The plugging slurry consists of base slurry and the high-pressure resistant plugging agent, wherein the high-pressure resistant plugging agent is added into each 100 milliliters of base slurry by 3-9 grams. The plugging agent and the plugging slurry of the invention adopt the combination of chemical plugging and particle bridging plugging to realize plugging, and can solve the technical problems of underground slit leakage, crack leakage and fault leakage. The method is suitable for severe lost circulation caused by porous stratum, fractured stratum, long-section fractured stratum and the like, and can be used for lost circulation construction with poorly defined lost circulation position.
CN 109796941A discloses an expansion plugging agent, a preparation method thereof, a microcapsule type plugging agent, water-based drilling fluid and application thereof. The expansion plugging agent is obtained by carrying out polymerization reaction on acrylamide, an intensity improving material, acrylic acid salt and a gelatinization colloid, wherein the acrylic acid salt is obtained by carrying out neutralization reaction on an acidity neutralizer and acrylic acid, and the gelatinization colloid is obtained by adding starch into deionized water to carry out gelatinization reaction. The expansion plugging agent for drilling fluid prepared by the invention has stable structure, high strength, good viscoelasticity, difficult denaturation under high-temperature and high-pressure environment at the bottom of the well and good plugging effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention mainly aims to provide a composite plugging agent, a preparation method and application thereof, wherein the composite plugging agent has good high temperature resistance and pressure bearing capacity.
The first aspect of the present invention provides a composite plugging agent comprising a polymer component, a fiber component, and an elastic particle component; based on the total weight of the composite plugging agent, the polymer component content is 30-60 wt%, the fiber component content is 20-40 wt% and the elastic particle component content is 20-40 wt%.
Further, in the above composite plugging agent, the fiber component may be one or more of crop straw extracted fiber, polyester fiber, cellulose acetate, glass fiber, asbestos fiber, cotton-hemp plant fiber, etc., preferably polyester fiber and/or glass fiber. The diameter of the fiber is 0.05-1 mm, and the length is 0.5-10 mm.
Further, in the above-mentioned composite plugging agent, the elastic particles may be one or more selected from rubber particles, resin particles, etc., and the particle size of the elastic particles is 20 to 40 mesh. The rubber particles are mainly produced by processing various waste rubber, including waste rubber, leftover materials, cable jackets, automobile tires and other waste rubber raw materials, and comprise natural rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, styrene butadiene rubber, butadiene rubber and the like. The resin particles are produced by processing various waste resins including polyethylene, polyvinyl chloride, polystyrene, polypropylene, ABS resin and other waste raw materials.
Further, in the above composite plugging agent, the polymer component includes a structural unit a, a structural unit B, and a structural unit D, wherein the structural units a and D form a copolymer through a crosslinking agent;
the structural unit A is starch;
the structural unit B is a vinyl monomer-containing structural unit;
the structural unit D is a clay mineral unit;
the structural formula of the polymer is as follows:
the structural formula of the structural unit B is
Or->
The method comprises the steps of carrying out a first treatment on the surface of the The method comprises the steps of carrying out a first treatment on the surface of the Wherein R is 1 And R is 3 Is the side chain structure of the vinyl polymer except the vinyl structure, R 2 CH-or N (nitrogen).
R is a methylene chain in the coupling agent, and forms a covalent bond Si-O-Si with HO-Si in the clay mineral through Si; the number of carbon atoms in the methylene chain is an integer of 1 to 5 (specifically 1, 2, 3, 4, 5), preferably an integer of 1 to 3 (specifically 1, 2, 3), in particular-CH 2 -、-CH 2 CH 2 -、-CH 2 CH 2 CH 2 -、-CH 2 CH 2 CH 2 -、-CH 2 CH 2 CH 2 CH 2 -、-CH 2 CH 2 CH 2 CH 2 CH 2 -；
m is the degree of polymerization of the starch building block, x is the degree of polymerization of the vinyl monomer, and m+x=800 to 1600.
Further, in the composite plugging agent, the content of the structural unit A is 20-65wt%, the content of the structural unit B is 12-55wt%, the content of the structural unit D is 12-55wt%, and the content of the cross-linking agent is 0.5-10wt%, based on the total amount of the polymer.
Furthermore, in the composite plugging agent, the starch can be one or more of mung bean starch, tapioca starch, sweet potato starch, wheat starch, water chestnut starch, lotus root starch and corn starch, and preferably corn starch and/or potato starch.
Further, in the composite plugging agent, the vinyl-containing monomer is a water-soluble vinyl monomer and can be one or more of a cationic monomer, an anionic monomer, a nonionic monomer and a zwitterionic monomer; further, the zwitterionic monomer is one or more of methacryloxyethyl-N, N-dimethyl propane sulfonate (DMAPS), N-dimethyl allyl amine propane sulfonate (DAPS), 4-Vinyl Pyridine Propane Sulfonate (VPPS), N-methyl diallyl propane sulfonate (MAPS) and N-methyl diallyl butane sulfonate (MABS), and is preferably N-methyl diallyl propane sulfonate. The cationic monomer is one or more of methacryloxyethyl trimethyl ammonium chloride (DMC), acryloxyethyl trimethyl ammonium chloride (DAC), acryloxyethyl dimethyl benzyl ammonium chloride (DBC), dimethyl diallyl ammonium chloride (DMDAAC) and diethyl diallyl ammonium chloride (DEDAAC), preferably dimethyl diallyl ammonium chloride. The anionic monomer is one or more of AA (acrylic acid), 2-methyl-2-acrylamidopropane sulfonic Acid (AMPS), fumaric Acid (FA), sodium allylsulfonate (SSS) and sodium 2-acryloyloxyisopentene sulfonate (AOIAS), and preferably 2-methyl-2-acrylamidopropane sulfonic acid. The nonionic monomer is one or more of N-vinyl pyrrolidone (NVP), acrylonitrile (AN), vinyl formamide (NVF) and vinyl acetamide (NVA), preferably N-vinyl pyrrolidone.
Further, in the above composite plugging agent, the crosslinking agent may be one or more of a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent, and is preferably a silane coupling agent. Wherein the silane coupling agent is one or more of gamma-chloropropyl trichlorosilane, gamma-chloropropyl methyl dichlorosilane, gamma-chloropropyl trimethoxysilane, gamma-chloropropyl triethoxysilane, chloromethyl triethoxysilane, gamma-aminopropyl trimethoxysilane, gamma- (beta-aminoethyl) aminopropyl trimethoxysilane, gamma-ureido propyl triethoxysilane and aniline methyl trimethoxysilane, preferably one or more of gamma-chloropropyl trichlorosilane, gamma-chloropropyl trimethoxysilane, gamma-aminopropyl triethoxysilane and gamma-aminopropyl trimethoxysilane, and further preferably gamma-chloropropyl trichlorosilane and/or gamma-chloropropyl trimethoxysilane.
Further, in the above-mentioned composite plugging agent, the clay mineral is one or more of kaolinite, montmorillonite, illite, sepiolite and attapulgite, preferably kaolinite, montmorillonite and illite, and more preferably montmorillonite.
The second aspect of the invention provides a preparation method of the composite plugging agent, which is to uniformly mix the polymer component, the fiber component and the elastic particle component to obtain the composite plugging agent.
In the preparation method of the composite plugging agent, the mixing can be performed by using a mixer, and the mixer can be any one or more of a vertical screw mixer, a planetary screw mixer, a rotary cylinder mixer, a V-shaped mixer and the like.
The third aspect of the invention provides a drilling fluid, which comprises the composite plugging agent, wherein the content of the composite plugging agent is 0.5-20wt%, preferably 2-10wt%, and more preferably 3-7wt% based on the total weight of the drilling fluid. The drilling fluid added with the composite plugging agent has good plugging capability, can effectively plug pores or micro-cracks, prevents filtrate from penetrating into stratum in a large amount, reduces filtrate loss, and has good plugging effect.
A fourth aspect of the present invention provides the use of a plugging agent as described above in a drilling process.
When the plugging agent is used in the drilling process, the addition amount is 0.1-5 wt%, preferably 0.5-5 wt%, and more preferably 1-5 wt%.
Compared with the prior art, the composite plugging agent and the preparation method thereof have the following advantages:
1. the composite plugging agent is formed by compounding polymer components, fiber components and elastic particles, wherein the fibers have good high temperature resistance, the fibers are long rod-shaped, the elastic particles are spherical, the elastic particles have good viscoelasticity at high temperature, a plurality of layers of irregular accumulation can be formed between the elastic particles and the high temperature resistant fiber components, and the high temperature resistant polymer is used for strengthening and solidifying, so that the pressure bearing capacity of the composite plugging agent is obviously improved.
2. In the composite plugging agent provided by the invention, the polymer component is modified by grafting the vinyl polymer monomer, so that the starch has the functions, and besides good plugging function, the temperature resistance, salt resistance and calcium resistance of the starch in drilling fluid are improved. In the preparation process of the polymer, the silane coupling agent is used for combining the organic starch and the inorganic clay mineral, so that the structural rigidity of the material is improved, and the pressure bearing capacity of the composite plugging agent is improved, because the viscosity of the grafted starch part in the polymer is increased after the grafted starch part is dissolved in water, the clay mineral can be tightly connected with a stratum, the interface effect is enhanced, and the pressure bearing capacity is further improved; and the clay mineral has the same lithology as the stratum, and the structure containing silicon and oxygen can be further condensed to form a bonding structure under high temperature and high pressure, so that the plugging and bearing capacity under high temperature and high pressure is greatly improved.
Detailed Description
The composite plugging agent, the preparation method and the application thereof are further described below by specific examples, but the invention is not limited thereto.
In the composite plugging agent, the polymer is prepared by the following method:
(a) Preparation of gelatinized starch
Mixing starch and water at 50-100 ℃, preferably 80-95 ℃, and uniformly mixing to obtain gelatinized starch, wherein the mass fraction of starch in the gelatinized starch is 5-20 wt%;
(b) Preparing aqueous solution of vinyl-containing monomer
Mixing vinyl-containing monomer with water, and uniformly mixing to obtain a vinyl-containing monomer aqueous solution, wherein the mass fraction of the vinyl-containing polymer monomer aqueous solution is 30-60 wt%;
(c) Preparation of powdery starch graft copolymer
The prepared aqueous solution containing vinyl monomer and gelatinized starch are mixed according to the dosage ratio of 1: 4-2: 1 are uniformly mixed at the temperature of 40-90 ℃, then an initiator is added to react at the temperature of 50-80 ℃, and the reaction product is further dried at the temperature of 60-120 ℃ for 8-16 hours and crushed to obtain a powdery starch graft copolymer; the initiator is one or more of potassium persulfate, sodium persulfate and ammonium persulfate; the initiator is used in an amount of 0.5 to 1.5wt% based on the total mass of the starch and the vinyl-containing monomer.
(d) Preparation of polymers
Dispersing powdery starch graft copolymer into an organic solvent, adding clay mineral and a cross-linking agent to react at 30-70 ℃, separating after the reaction is finished, and then drying at 60-120 ℃ for 8-16 hours to obtain a polymer; the dosage of the organic solvent is 2-8 times of the total mass of the starch and the vinyl-containing monomer;
in the above polymer preparation method, the crushing in the step (c) may be any of the existing modes capable of crushing solid materials, such as a crusher, etc., and the specific conditions of the crushing may be selected by those skilled in the art according to the actual needs of the product.
In the above polymer preparation method, the separation in the step (d) may be one or more of standing, layering, filtering, centrifuging, spray drying, direct powdering, and the like.
Example 1
40g of corn starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 15%. Stirring at 90deg.C for 60min to obtain gelatinized starch; then, 30g of methacryloyloxyethyl-N, N-dimethylpropanesulfonate was weighed and prepared as a 50% by mass aqueous solution. Adding into gelatinized starch, and mixing at 70deg.C for 30min; adding 0.56g of potassium persulfate, and reacting for 3 hours at 70 ℃ to obtain a viscous starch graft copolymer; drying and dewatering at 110 ℃, and crushing to obtain the powdery starch graft copolymer. Dispersing the powdery starch graft copolymer in 300mL of ethyl acetate, and fully stirring and dispersing for 30min; adding 30g of kaolinite, mixing and re-dispersing for 30min; 5g of gamma-chloropropyl trimethoxysilane are added and reacted for 4h at 45 ℃. After the reaction, separating and removing the organic solvent, drying for 8 hours at 110 ℃, crushing to obtain a polymer, and uniformly mixing with 40g of polyester fiber and 50g of rubber particles to obtain the composite plugging agent.
Example 2
20g of potato starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 8%. Stirring at 85deg.C for 80min to obtain gelatinized starch; 35g of 2-methyl-2-acrylamidopropane sulfonic acid was weighed to prepare a 52% by mass aqueous solution. Adding into gelatinized starch, and mixing at 60deg.C for 30min; adding 0.61g of ammonium persulfate, and reacting for 4 hours at 60 ℃ to obtain a viscous starch graft copolymer; drying at 120 deg.c to eliminate water and crushing to obtain powdered starch graft copolymer. Dispersing starch graft copolymer powder in 450ml of methanol, and fully stirring and dispersing for 30min; adding 15g of montmorillonite, mixing and re-dispersing for 30min; 4g of gamma-chloropropyl trichlorosilane are added and reacted for 4 hours at 55 ℃. After the reaction, separating and removing the organic solvent, drying for 12 hours at 90 ℃, crushing to obtain a polymer, and then uniformly mixing with 35g of crop straw extracted fiber and 60g of rubber particles to obtain the composite plugging agent.
Example 3
33g of sweet potato starch is weighed and added into deionized water to prepare starch suspension with the mass fraction of 20%. Stirring at 80deg.C for 90min to obtain gelatinized starch; 15g of methacryloyloxyethyl trimethyl ammonium chloride was weighed to prepare a 30% by mass aqueous solution. Adding into gelatinized starch, and mixing at 55deg.C for 30min; adding 0.62g of sodium persulfate, and reacting for 4 hours at 55 ℃ to obtain a viscous starch graft copolymer; drying at 90 ℃ to remove water, and crushing to obtain the powdery starch graft copolymer. Dispersing starch graft copolymer powder in 550ml ethanol, and stirring thoroughly for 30min; then adding 27g of montmorillonite, mixing and re-dispersing for 30min; 2.5g of gamma-aminopropyl triethoxysilane was added and reacted at 50℃for 3h. After the reaction, separating and removing the organic solvent, drying for 10 hours at 120 ℃, crushing to obtain a polymer, and then uniformly mixing with 45g of cellulose acetate and 45g of resin particles to obtain the composite plugging agent.
Example 4
25g of mung bean starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 5%. Stirring at 90deg.C for 70min to obtain gelatinized starch; 40, g N-vinyl pyrrolidone is weighed and prepared into a 60% aqueous solution by mass percent. Adding into gelatinized starch, and mixing at 75deg.C for 30min; adding 0.33g of potassium persulfate, and reacting for 2 hours at 75 ℃ to obtain a viscous starch graft copolymer; drying at 70 ℃ to remove water, and crushing to obtain the powdery starch graft copolymer. Dispersing starch graft copolymer powder in 420ml butyl acetate, and fully stirring and dispersing for 30min; adding 10g of attapulgite, mixing and re-dispersing for 30min; 4.5g of phenylmethyltrimethoxysilane were added and reacted at 60℃for 3 hours. After the reaction, separating and removing the organic solvent, drying for 9 hours at 100 ℃, crushing to obtain a polymer, and uniformly mixing with 30g of glass fiber and 30g of resin particles to obtain the composite plugging agent.
Example 5
35g of lotus root starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 16%. Stirring at 93 ℃ for 60min to obtain gelatinized starch; then, 10g of sodium allylsulfonate was weighed to prepare a 42% by mass aqueous solution. Adding into gelatinized starch, and mixing at 80deg.C for 30min; adding 0.68g of sodium persulfate, and reacting for 2.5 hours at 80 ℃ to obtain a viscous starch graft copolymer; drying and dewatering at 95 ℃, and crushing to obtain the powdery starch graft copolymer. Dispersing starch graft copolymer powder in 380ml ethanol, and stirring thoroughly for 30min; adding 40g of sepiolite, mixing and re-dispersing for 30min; 1g of gamma-chloropropyl trimethoxysilane was added and reacted at 55℃for 2h. After the reaction, separating and removing the organic solvent, drying for 11 hours at 95 ℃, crushing to obtain a polymer, and then uniformly mixing with 30g of asbestos fiber and 30g of resin particles to obtain the composite plugging agent.
Example 6
22g of corn starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 10%. Stirring at 88 deg.C for 75min to obtain gelatinized starch; 18g of 4-vinylpyridine propane sulfonate was weighed again and prepared as a 36% by mass aqueous solution. Adding into gelatinized starch, and mixing at 65deg.C for 30min; adding 0.4g of potassium persulfate, and reacting for 3 hours at 65 ℃ to obtain a viscous starch graft copolymer; drying at 105 deg.c to eliminate water and crushing to obtain powdered starch graft copolymer. Dispersing starch graft copolymer powder in 620ml butanol, stirring thoroughly for 30min; adding 36g of montmorillonite, mixing and re-dispersing for 30min; 3g of gamma-ureidopropyltriethoxysilane are added and reacted at 50℃for 3h. After the reaction, separating and removing the organic solvent, drying for 13 hours at 90 ℃, crushing to obtain a polymer, and then uniformly mixing with 50g of cotton-hemp plant fiber and 50g of resin particles to obtain the composite plugging agent.
Comparative example 1
40g of corn starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 15%. Stirring at 90deg.C for 60min to obtain gelatinized starch, drying at 110deg.C for removing water, and pulverizing to obtain powdery starch. Dispersing powdery starch in 300mL ethyl acetate, and fully stirring and dispersing for 30min; adding 30g of kaolinite, mixing and re-dispersing for 30min; 5g of gamma-chloropropyl trimethoxysilane are added and reacted for 4h at 45 ℃. After the reaction, separating and removing the organic solvent, drying for 8 hours at 110 ℃, crushing to obtain a polymer, and uniformly mixing with 40g of polyester fiber and 50g of rubber particles to obtain the composite plugging agent.
Comparative example 2
40g of corn starch is weighed and added into deionized water to prepare a starch suspension with the mass fraction of 15%. Stirring at 90deg.C for 60min to obtain gelatinized starch; then, 30g of methacryloyloxyethyl-N, N-dimethylpropanesulfonate was weighed and prepared as a 50% by mass aqueous solution. Adding into gelatinized starch, and mixing at 70deg.C for 30min; adding 0.56g of potassium persulfate, and reacting for 3 hours at 70 ℃ to obtain a viscous starch graft copolymer; drying and dewatering at 110 ℃, and crushing to obtain the powdery starch graft copolymer. Dispersing the powdery starch graft copolymer in 300mL of ethyl acetate, and fully stirring and dispersing for 30min; adding 30g of kaolinite, mixing and re-dispersing for 30min; the reaction was carried out at 45℃for 4h. After the reaction, separating and removing the organic solvent, drying for 8 hours at 110 ℃, crushing to obtain a polymer, and uniformly mixing with 40g of polyester fiber and 50g of rubber particles to obtain the composite plugging agent.
Samples of the examples and the comparative examples were taken, and the pressure bearing capacity test was performed using a QD-2 type plugging device with an addition of 5wt% and using different slit plates. The test results are shown in tables 1 and 2. The experimental slurry is mixed salt water-based slurry, and the preparation method comprises the following steps: 40g of test soil is weighed and added into 1000ml of water, 1.4g of anhydrous sodium carbonate is added, and 100g of NaCl and 50g of CaCl are added after stirring for 20min 2 And (5) sealing and curing for 24 hours at room temperature for standby. Before testing the bearing capacity, 350mL of base slurry is added with 5wt% plugging agent, stirred for 20min, then added into an aging kettle, rolled and aged for 16h at 160 ℃, cooled, taken out and stirred for 20min, and then tested for the bearing capacity.
Table 1 results of test of pressure bearing ability of sample on 1mm slit plate
| Sequence number | Sample of | Pressure bearing capacity/MPa |
| 1 | Example 1 | 6.9 |
| 2 | Example 2 | 6.4 |
| 3 | Example 3 | 6.5 |
| 4 | Example 4 | 6.4 |
| 5 | Example 5 | 6.7 |
| 6 | Example 6 | 6.6 |
| 7 | Comparative example 1 | 3.2 |
| 8 | Comparative example 2 | 2.8 |
Table 2 results of test of the bearing ability of the sample in the 3mm slit plate
| Sequence number | Sample of | Pressure bearing capacity/MPa |
| 1 | Example 1 | 6.4 |
| 2 | Example 2 | 6.2 |
| 3 | Example 3 | 6.3 |
| 4 | Example 4 | 6.0 |
| 5 | Example 5 | 5.9 |
| 6 | Example 6 | 6.1 |
| 7 | Comparative example 1 | 2.6 |
| 8 | Comparative example 2 | 2.0 |
Claims (16)
1. A composite plugging agent, which comprises a polymer component, a fiber component and an elastic particle component; based on the total weight of the composite plugging agent, the content of the polymer component is 30-60 wt%, the content of the fiber component is 20-40 wt% and the content of the elastic particle component is 20-40 wt%;
the fiber component is one or more of crop straw extracted fiber, polyester fiber, cellulose acetate, glass fiber, asbestos fiber and cotton-hemp plant fiber; the diameter of the fiber component is 0.05-1 mm, and the length is 0.5-10 mm;
the elastic particle component is selected from one or more of rubber particles and resin particles; the particle size of the elastic particle component is 20-40 meshes;
the polymer component comprises a structural unit A, a structural unit B and a structural unit D, wherein the structural units A and D form a copolymer through a cross-linking agent; based on the total amount of polymer components, the content of the structural unit A is 20-65 wt%, the content of the structural unit B is 12-55 wt%, the content of the structural unit D is 12-55 wt%, and the content of the cross-linking agent is 0.5-10 wt%;
the structural unit A is starch;
the structural unit B is a vinyl monomer-containing structural unit;
the structural unit D is a clay mineral unit;
the vinyl-containing monomer is water-soluble vinyl monomer, and is one or more of cationic monomer, anionic monomer, nonionic monomer and zwitterionic monomer;
the zwitterionic monomer is one or more of methacryloxyethyl-N, N-dimethyl propane sulfonate, N-dimethyl allylamine propane sulfonate, 4-vinyl pyridine propane sulfonate, N-methyl diallyl propane sulfonate and N-methyl diallyl butane sulfonate;
the cationic monomer is one or more of methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl dimethylbenzyl ammonium chloride, dimethyl diallyl ammonium chloride and diethyl diallyl ammonium chloride;
the anionic monomer is one or more of acrylic acid, 2-methyl-2-acrylamidopropane sulfonic acid, fumaric acid, sodium allylsulfonate and sodium 2-acryloyloxyisopentene sulfonate;
the nonionic monomer is one or more of N-vinyl pyrrolidone, acrylonitrile, vinyl formamide and vinyl acetamide;
the cross-linking agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.
2. The composite plugging agent of claim 1, wherein: the fiber component is polyester fiber and/or glass fiber.
3. The composite plugging agent of claim 1, wherein: the starch is one or more of mung bean starch, tapioca starch, sweet potato starch, wheat starch, water chestnut starch, lotus root starch and corn starch.
4. The composite plugging agent of claim 1, wherein: the zwitterionic monomer is N-methyl diallyl propane sulfonate.
5. The composite plugging agent of claim 1, wherein: the cationic monomer is dimethyl diallyl ammonium chloride.
6. The composite plugging agent of claim 1, wherein: the anionic monomer is 2-methyl-2-acrylamidopropane sulfonic acid.
7. The composite plugging agent of claim 1, wherein: the nonionic monomer is N-vinyl pyrrolidone.
8. The composite plugging agent of claim 1, wherein: the silane coupling agent is one or more of gamma-chloropropyl trichlorosilane, gamma-chloropropyl methyl dichlorosilane, gamma-chloropropyl trimethoxysilane, gamma-chloropropyl triethoxysilane, chloromethyl triethoxysilane, gamma-aminopropyl trimethoxysilane, gamma- (beta-aminoethyl) aminopropyl trimethoxysilane, gamma-ureido propyl triethoxysilane and aniline methyl trimethoxysilane.
9. The composite plugging agent of claim 8, wherein: the silane coupling agent is one or more of gamma-chloropropyl trichlorosilane, gamma-chloropropyl trimethoxysilane, gamma-aminopropyl triethoxysilane and gamma-aminopropyl trimethoxysilane.
10. The composite plugging agent of claim 8, wherein: the silane coupling agent is gamma-chloropropyl trichlorosilane and/or gamma-chloropropyl trimethoxyl silane.
11. The composite plugging agent of claim 1, wherein: the clay mineral is one or more of kaolinite, montmorillonite, illite, sepiolite, and attapulgite.
12. The method for preparing a composite plugging agent according to any one of claims 1 to 11, wherein the polymer component, the fiber component and the elastic particle component are uniformly mixed to obtain the composite plugging agent.
13. A drilling fluid comprising the composite plugging agent according to any one of claims 1 to 11, wherein the composite plugging agent is 0.5 to 20wt% based on the total weight of the drilling fluid.
14. The drilling fluid of claim 13, wherein: the content of the composite plugging agent is 2-10wt% based on the total weight of the drilling fluid.
15. The drilling fluid of claim 13, wherein: based on the total weight of the drilling fluid, the content of the composite plugging agent is 3-7wt%.
16. Use of a composite plugging agent according to any one of claims 1-11 in a drilling process.
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