CN115725283B - Lignin-based composite channeling sealing agent and preparation method and application thereof - Google Patents
Lignin-based composite channeling sealing agent and preparation method and application thereof Download PDFInfo
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- CN115725283B CN115725283B CN202111009358.7A CN202111009358A CN115725283B CN 115725283 B CN115725283 B CN 115725283B CN 202111009358 A CN202111009358 A CN 202111009358A CN 115725283 B CN115725283 B CN 115725283B
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- 230000005465 channeling Effects 0.000 title claims abstract description 100
- 229920005610 lignin Polymers 0.000 title claims abstract description 95
- 238000007789 sealing Methods 0.000 title claims abstract description 75
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 86
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002562 thickening agent Substances 0.000 claims abstract description 25
- 239000003381 stabilizer Substances 0.000 claims abstract description 14
- 239000000295 fuel oil Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000011259 mixed solution Substances 0.000 claims abstract description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 22
- 229920000459 Nitrile rubber Polymers 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000000440 bentonite Substances 0.000 claims description 13
- 229910000278 bentonite Inorganic materials 0.000 claims description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 13
- 230000033558 biomineral tissue development Effects 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 9
- 229920001577 copolymer Polymers 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 150000001299 aldehydes Chemical class 0.000 claims description 8
- 150000001408 amides Chemical group 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 8
- 239000002585 base Substances 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 7
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 claims description 4
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims description 4
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims description 4
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 4
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 3
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims description 3
- 230000002255 enzymatic effect Effects 0.000 claims description 3
- 235000010350 erythorbic acid Nutrition 0.000 claims description 3
- 229940026239 isoascorbic acid Drugs 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 239000002981 blocking agent Substances 0.000 claims 7
- 230000000903 blocking effect Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 description 20
- 238000006297 dehydration reaction Methods 0.000 description 20
- 238000003756 stirring Methods 0.000 description 19
- 238000012360 testing method Methods 0.000 description 19
- 239000004971 Cross linker Substances 0.000 description 14
- 239000000084 colloidal system Substances 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 235000011121 sodium hydroxide Nutrition 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009830 intercalation Methods 0.000 description 3
- 230000002687 intercalation Effects 0.000 description 3
- -1 phenolic aldehyde Chemical class 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 235000013824 polyphenols Nutrition 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- CEYYIKYYFSTQRU-UHFFFAOYSA-M trimethyl(tetradecyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCC[N+](C)(C)C CEYYIKYYFSTQRU-UHFFFAOYSA-M 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229920001732 Lignosulfonate Polymers 0.000 description 2
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- DUEPRVBVGDRKAG-UHFFFAOYSA-N carbofuran Chemical compound CNC(=O)OC1=CC=CC2=C1OC(C)(C)C2 DUEPRVBVGDRKAG-UHFFFAOYSA-N 0.000 description 2
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010979 pH adjustment Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- CXRFDZFCGOPDTD-UHFFFAOYSA-M Cetrimide Chemical compound [Br-].CCCCCCCCCCCCCC[N+](C)(C)C CXRFDZFCGOPDTD-UHFFFAOYSA-M 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229920005551 calcium lignosulfonate Polymers 0.000 description 1
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000138 intercalating agent Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229920001864 tannin Polymers 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- SZEMGTQCPRNXEG-UHFFFAOYSA-M trimethyl(octadecyl)azanium;bromide Chemical compound [Br-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C SZEMGTQCPRNXEG-UHFFFAOYSA-M 0.000 description 1
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- Sealing Material Composition (AREA)
Abstract
The invention provides a lignin-based composite channeling sealing agent, and a preparation method and application thereof. The lignin-based composite channeling sealing agent comprises lignin, a modified cross-linking agent, a thickening agent, a stabilizing agent and preparation water. Adding the thickener into the preparation water for fully dissolving, then adding lignin and the stabilizer, and uniformly mixing to prepare a mixed solution; and (3) dripping a modified cross-linking agent into the mixed solution, uniformly mixing, and then adjusting the pH value to obtain the lignin-based composite channeling sealing agent. The lignin-based composite channeling sealing agent disclosed by the invention obviously improves the blocking strength, toughness, blocking efficiency, effective period and the like of a lignin-based channeling sealing system through modification of the cross-linking agent, has the blocking rate higher than 99.05%, can effectively block a steam channeling passage for a long time, realizes efficient development of a heavy oil reservoir, meets the performance and economical requirements of site construction, and has higher practicability.
Description
Technical Field
The invention relates to the technical field of oilfield chemicals, in particular to a lignin-based composite channeling sealing agent, a preparation method and application thereof.
Background
In the process of thick oil steam exploitation, after high-pass steam huff and puff, a steam channeling passage is generated in the stratum, so that inter-well steam channeling interference is caused, the exploitation effect is poor, and therefore, a high-efficiency blocking steam channeling technology is required to be reserved.
There are various methods for thick oil seal steam channeling and side water invasion inhibition, but there are some common defects. At present, the channeling sealing agents commonly used in oil fields mainly comprise high-temperature gel, foam, solid-phase particle plugging agents and the like, wherein solid-phase particles are easy to stay in a near wellbore zone, the foam is heavy in profile control, and the plugging effect is poor. The high-temperature gel has wide application, and the gel forming agent mainly comprises lignin, tannin extract, humic acid and other rigid polymers, wherein the plugging agent taking lignin as the main agent has good temperature resistance and high strength after the crosslinking reaction, and the material has wide sources and relatively low price.
However, on one hand, lignin has high methoxy content, low hydroxyl content, large steric hindrance and obviously insufficient reaction activity; on the other hand, because of a large number of benzene ring groups in the structure of the phenolic resin, the channeling sealing agent prepared by taking the benzene ring groups as the cross-linking agent has poor toughness and short effective period, and the application of the phenolic resin cross-linking agent in the future thick oil thermal recovery plugging operation is limited.
Therefore, the 'lignin-phenolic' channeling sealing agent often has the problems of large dosage of lignin and cross-linking agent, low colloid strength and poor toughness. When the external force exceeds the strength of the colloid, the colloid is broken, and the system cannot be restored, so that the channeling sealing performance is greatly lost.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a lignin-based composite channeling sealing agent, and a preparation method and application thereof. The viscosity of the lignin-based composite channeling sealing agent is 8.4-17.8 mPa.s at normal temperature (25 ℃), and the lignin-based composite channeling sealing agent has good pumpability; can be controlled to be gel (2-168 h) in a wider temperature range (90-300 ℃), and the gel strength is over 0.074-0.088 MPa; the gel is not broken at the high temperature of 300 ℃ for 60 days, the gel volume is basically unchanged, and the dehydration rate is less than 3.3%; the plugging rate is higher than 99.05%, the steam channeling channel can be effectively plugged for a long time, and the high-efficiency development of the heavy oil reservoir is realized. Through the modification of the cross-linking agent, the blocking strength, toughness, blocking efficiency, effective period and the like of the lignin-based channeling blocking system are obviously improved, the performance and economical efficiency requirements of site construction are met, and the practicability is higher.
The invention aims to provide a lignin-based composite channeling sealing agent, which is prepared from the following raw materials in parts by weight;
lignin, a modified cross-linking agent, a thickening agent, a stabilizing agent and formulated water;
based on the total weight of the raw materials as 100 percent,
the addition amount of lignin is 3-9wt%;
the addition amount of the modified cross-linking agent is 0.1-3wt%;
the addition amount of the thickener is 0.001-0.15wt%;
the addition amount of the stabilizer is 0.001-0.05wt%.
In order to further obtain better effects, in particular, the channeling sealing agent can realize controllable crosslinking at a higher gel forming temperature, and the gel strength is better, preferably,
based on the total weight of the raw materials as 100 percent,
the addition amount of the lignin is 5.5-7wt%;
the modified crosslinking agent is added in an amount of 0.5 to 2%, more preferably 1 to 1.8% by weight;
the addition amount of the thickener is 0.05-0.1wt%;
the addition amount of the stabilizer is 0.01-0.03wt%.
In the present invention, the amount of water to be added is preferably such that the above-mentioned components fall within the ranges, and the skilled person can determine it according to the actual circumstances.
Preferably, the method comprises the steps of,
the lignin is at least one of alkali lignin, enzymolysis lignin, sodium lignin sulfonate, chlorinated lignin, steam explosion lignin, wood grinding lignin or sulfur lignin; preferably at least one of alkali lignin or enzymatic lignin;
in the present invention, the lignosulfonate is a lignosulfonate commonly used in the art, including but not limited to sodium lignosulfonate, calcium lignosulfonate, and the like.
The thickener is an amide thickener, preferably at least one of acrylamide/2-acrylamide-2-methylpropanesulfonic acid copolymer (AM-AMPS copolymer), and the weight average molecular weight of the thickener is 500-3000 ten thousand; preferably 1000 to 2000 tens of thousands.
Preferably, the method comprises the steps of,
the stabilizer is at least one selected from sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium dithionite, isoascorbic acid or thiourea; and/or
In the present invention, the formulation water is not particularly limited, and may be river, lake, sea water, groundwater, artificial water, oilfield produced water, etc., preferably water having a mineralization degree of less than 200000mg/L, more preferably water having a mineralization degree of less than 100000 mg/L.
Preferably, the method comprises the steps of,
the preparation method of the modified cross-linking agent comprises the following steps:
premixing water, phenol, aldehyde, nitrile rubber and organic bentonite, adding a base catalyst, and heating for reaction; and after the reaction is finished, regulating the pH value, and distilling to obtain the modified cross-linking agent.
Preferably, the method comprises the steps of,
the phenol is selected from at least one of phenol, hydroquinone, resorcinol or catechol; and/or
The aldehyde is selected from at least one of formaldehyde, acetaldehyde or furfural; and/or
The nitrile rubber is selected from liquid nitrile rubber, more preferably at least one of LNBR-26 and LNBR-40; and/or
In the invention, the organic bentonite is the existing common organic bentonite, and is preferably at least one organic bentonite selected from octadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide and tetradecyl trimethyl ammonium chloride;
the base catalyst is a soluble base, preferably at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate or sodium bicarbonate.
Preferably, the method comprises the steps of,
the mass ratio of the phenol to the aldehyde to the nitrile rubber is 1: (1.5-4): (0.01-0.05); preferably 1: (1.6-3): (0.02-0.04);
the concentration of the phenol is 1.5-3wt%;
the concentration of the organic bentonite is 0.5-2.5wt%;
the concentration of the alkali catalyst is 0.5-1wt%;
the pH value is adjusted to 7.5-9.5.
In the present invention, the conditions for the reaction of the modified crosslinking agent are not particularly limited, and the reaction may be completed; the stirring speed of each step is not particularly limited, and the pH adjustment is also a common pH adjustment material in the art, such as dilute hydrochloric acid, dilute sulfuric acid, etc., in order to achieve the object and to achieve uniform mixing.
Preferably, the method comprises the steps of,
the premixed stirring speed is 150-300 r/min;
the temperature of the heating reaction is 78-88 ℃ and the reaction time is 30-90min;
the distillation mode is reduced pressure distillation; distilling until the solid content is more than or equal to 40 percent.
In the invention, the lignin, the thickener, the preparation raw materials of the modified cross-linking agent and the stabilizer are all commercially available.
The inventor of the invention unexpectedly discovers that after the lignin-phenolic aldehyde sealing channeling system is glued, the strength is poor and the toughness is insufficient, when the external force exceeds the strength of the colloid, the colloid is broken, and the system cannot be restored, so that the sealing channeling performance is greatly lost. The C-C bond of the nitrile rubber has stronger space rotation deformation capability, and the C-N bond can be hydrolyzed to form an amide bond under the high temperature condition so as to react with phenolic aldehyde. By introducing nitrile rubber into phenolic aldehyde, entanglement and reinforcement of lignin space network structure can be realized, and colloid strength and toughness after colloid formation are improved. Meanwhile, bentonite is required to be introduced into phenolic aldehyde for modification, and the bentonite can be uniformly dispersed in a glue solution forming system to avoid agglomeration, so that on one hand, the effect of the nano reinforcing filler is achieved, and the strength of the plugging agent obtained after the glue forming by using the crosslinking agent can be improved; the plugging agent can interact with lignin, so that the toughness of the lignin-based plugging agent is increased, and the plugging performance is improved. The lignin-based composite channeling sealing agent is matched with other components for use, has the viscosity of 8.4-17.8 mPa.s at normal temperature (25 ℃), and has good pumpability; can be controlled to be gel (2-168 h) in a wider temperature range (90-300 ℃), and the gel strength is over 0.074-0.088 MPa; the gel is not broken at the high temperature of 300 ℃ for 60 days, the gel volume is basically unchanged, and the dehydration rate is less than 3.3%; the plugging rate is higher than 99.05%, the steam channeling channel can be effectively plugged for a long time, and the high-efficiency development of the heavy oil reservoir is realized.
The second purpose of the invention is to provide a preparation method of the lignin-based composite channeling sealing agent, which is one of the purposes of the invention, and comprises the following steps:
(1) Adding the thickener into the preparation water for fully dissolving, then adding lignin and the stabilizer, and uniformly mixing to prepare a mixed solution;
(2) And (3) dripping a modified cross-linking agent into the mixed solution, uniformly mixing, and then adjusting the pH value to obtain the lignin-based composite channeling sealing agent.
Preferably, the method comprises the steps of,
in step (2), the pH is adjusted to 8 to 11, preferably 9 to 10.
In the invention, whether the pH value needs to be regulated or not depends on the condition of the pH value of the channeling sealing system; if the pH value of the channeling sealing system is within the above range, the pH value may not be adjusted.
The pH regulator used for regulating the pH value can be acid and alkaline substances commonly used in the prior art for regulating the pH value; preferably, the pH regulator is at least one selected from dilute hydrochloric acid, dilute sulfuric acid, sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium acetate and ammonia water.
In the invention, the specific substances and the dosage of the added pH regulator are correspondingly selected and adjusted according to the acid and alkali conditions of the channeling sealing system, so that the pH value in the channeling sealing system can be within the limited pH value range.
Preferably, the content of the pH regulator is 0.1-1.5wt% based on 100% of the total weight of the raw materials; more preferably, the pH adjustor is contained in an amount of 0.5 to 1.2wt%.
In the present invention, the stirring speed is not particularly limited, provided that the lignin-based composite channeling sealing agent can be uniformly mixed.
The invention further aims to provide the application of the lignin-based composite channeling sealing agent in heavy oil exploitation.
Compared with the prior art, the invention has the following advantages:
the viscosity of the lignin-based composite channeling sealing agent at normal temperature (25 ℃) is 8.4-17.8 mPa.s, and the lignin-based composite channeling sealing agent has good pumpability; can be controlled to be gel (2-168 h) in a wider temperature range (90-300 ℃), and the gel strength is over 0.074-0.088 MPa; the gel is not broken at the high temperature of 300 ℃ for 60 days, the gel volume is basically unchanged, and the dehydration rate is less than 3.3%; the plugging rate is higher than 99.05%, the steam channeling channel can be effectively plugged for a long time, and the high-efficiency development of the heavy oil reservoir is realized.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and it should be noted that the following embodiments are only for further description of the present invention and should not be construed as limiting the scope of the present invention, and some insubstantial modifications and adjustments of the present invention by those skilled in the art from the present disclosure are still within the scope of the present invention.
The raw material sources are as follows:
the enzymatic lignin was purchased from Shandong Longli Biotechnology Co., ltd, with an effective content of 94.8wt%.
Sodium lignin sulfonate and alkali lignin were purchased from the technical company of carbofuran.
The amide thickener (AM-AMPS type copolymer) was purchased from Shandong Bao Mohs Biochemical Co., ltd, and had an effective content of about 88wt% and a weight average molecular weight of 1500 ten thousand.
Phenolic resin was purchased from eastern chemical industry limited in the Shandong and had an effective content of about 50wt%.
Liquid nitrile rubber is available from medium petroleum Lanzhou petrochemical company.
Phenols, aldehydes, stabilizers were purchased from carbofuran technologies.
The organobentonite was purchased from Zhejiang Fenghao New Material Co., ltd.
The testing method comprises the following steps:
initial viscosity measurement:
viscosity was measured using a Brookfield DV-III viscometer.
Colloid strength test:
the colloid strength is tested by adopting a breakthrough vacuum degree method, and the specific operation is as follows: the gel is put into a test bottle of a breaking vacuum degree experiment device, a 1mL pipette tip part is inserted into a position 1cm below the surface of the gel, a vacuum pump is started, a knob is slowly adjusted to increase the system vacuum degree, when air breaks through the gel, the maximum reading of the vacuum degree on a vacuum meter, namely the breaking vacuum degree of the gel, is repeatedly measured for 3 times, and the arithmetic average value is taken as the final strength value.
And (3) plugging rate test:
the simulated core (diameter of core is 25mm, length is 600 mm) is filled, and vacuuming and water saturation are carried out. Firstly, injecting water into the rock core at a certain flow rate, and measuring the permeability (k) before the rock core is plugged 0 ) The method comprises the steps of carrying out a first treatment on the surface of the Then under the condition of gas-liquid ratio of 1:1, different plugging agents are injected into the core at the injection rate of 2mL/min, after stabilization (gel formation), the heating jacket is heated to a specified temperature, and subsequent displacement phase displacement is carried out; finally, the permeability (k') of the core after plugging is measured by water injection. The plugging rate is used as a parameter for representing the plugging effect of the plugging agent, and the calculation formula of the plugging rate is as followsWherein k is 0 To block the permeability before 2 The method comprises the steps of carrying out a first treatment on the surface of the k' is the permeability after plugging, μm 2 。
The heating jacket heating temperature corresponds to the desired temperature of the displacement phase to be simulated, which may be water or water vapor.
The dehydration rate testing method comprises the following steps:
after the reaction of the high-temperature stability test at 300 ℃, the volume of the free water outside the colloid in the reactor is measured, the dehydration rate is the ratio of the volume of the free water to the total volume of the gel forming liquid, and the volumes are all measured at room temperature.
Preparation example 1
Preparation of modified crosslinker FQ-1
(1) 87.55g of water, 2.5g of phenol, 7.5g of formaldehyde, 0.1g of LNBR-26 and 1.6g of organic bentonite (hexadecyl trimethyl ammonium chloride is taken as an intercalation agent) are added into a three-neck flask provided with a stirrer and a return pipe, uniformly stirred at the speed of 250 revolutions per minute, and premixing is finished;
(2) Then heating the system to the set temperature of 80 ℃, adding 0.75g of NaOH under stirring, continuing stirring, heating, refluxing, and reacting for 40min;
(3) And after the reaction is finished, regulating the pH value to 7.5, and carrying out reduced pressure distillation until the solid content is 55%, thereby obtaining the modified cross-linking agent FQ-1.
Preparation example 2
Preparation of modified crosslinker FQ-2
(1) 92.255g of water, 1.8g of hydroquinone, 4.2g of acetaldehyde, 0.045g of LNBR-40 (liquid nitrile rubber 40) and 1g of organic bentonite (tetradecyl trimethyl ammonium chloride is taken as an intercalation agent) are added into a three-neck flask provided with a stirrer and a return pipe, uniformly stirred at the speed of 250 revolutions per minute, and premixing is finished;
(2) Then the system is heated to the set temperature of 80 ℃, 0.7g of potassium hydroxide is added under stirring, the stirring is continued at 700 rpm, the heating and the reflux are carried out, and the reaction is carried out for 80min;
(3) And after the reaction is finished, regulating the pH value to 8.0, and carrying out reduced pressure distillation until the solid content is 48%, so as to obtain the modified cross-linking agent FQ-2.
Preparation example 3
The preparation of the modified cross-linking agent FQ-3 comprises the following steps:
(1) 91.988g of water, 2.1g of phenol, 3.8g of formaldehyde, 0.052g of LNBR-26 (liquid nitrile rubber 26) and 1.2g of organic bentonite (octadecyl trimethyl ammonium chloride is taken as an intercalation agent) are added into a three-neck flask provided with a stirrer and a return pipe, uniformly stirred at the speed of 250 revolutions per minute, and premixing is finished;
(2) Then the system is heated to the set temperature of 85 ℃, 0.86g of NaOH is added under stirring, the stirring is continued at 700 rpm, the heating and the reflux are carried out, and the reaction is carried out for 60min;
(3) After the reaction is finished, the pH value is regulated to 9.0, and the mixture is distilled under reduced pressure until the solid content is 51%, so that the modified cross-linking agent FQ-3 is obtained.
Example 1
0.08g of amide thickener (AM-AMPS copolymer) is dissolved in 80g of preparation water with the mineralization degree of 15000mg/L and stirred at the rotating speed of 500r/min until the mixture is uniformly dissolved; then adding 6.4g of enzymolysis lignin and 0.025g of sodium thiosulfate; after stirring uniformly, 1.7g of modified cross-linking agent FQ-1 is slowly dripped, naOH is added to adjust the pH value to 9.5, and then the prepared water with the mineralization degree of 15000mg/L is added to be quantified to 100g, and the lignin-based composite channeling sealing agent is obtained after stirring uniformly. The initial viscosity of the lignin-based composite channeling sealing agent is 13.2 mPa.s at 25 ℃; the strength reaches 0.084MPa after gel forming at 100 ℃; and the gel is not broken after being kept at 300 ℃ for 60 days, and the dehydration rate is 1.8%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 99.58%.
Example 2
0.05g of amide thickener (AM-AMPS copolymer) is dissolved in 80g of prepared water with the mineralization degree of 20000mg/L, and stirred at the rotating speed of 500r/min until the mixture is uniformly dissolved; then adding 5.5g of enzymolysis lignin and 0.01g of thiourea; after stirring uniformly, 1g of modified cross-linking agent FQ-1 is slowly dripped, naOH is added to adjust the pH value to 10, and then the prepared water with the mineralization degree of 20000mg/L is added to quantitatively reach 100g, and the lignin-based composite channeling sealing agent is obtained after stirring uniformly. The initial viscosity of the lignin-based composite channeling sealing agent is 8.4 mPa.s at 25 ℃; the strength reaches 0.074MPa after the gel is formed at 150 ℃; and the gel is not broken after being kept at 300 ℃ for 60 days, and the dehydration rate is 2.4%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 99.11%.
Example 3
0.06g of amide thickener (AM-AMPS copolymer) is dissolved in 80g of preparation water with the mineralization degree of 50000mg/L and stirred at the rotating speed of 500r/min until the mixture is uniformly dissolved; then adding 6.6g of enzymolysis lignin and 0.028 thiourea; after stirring uniformly, 1.6g of modified cross-linking agent FQ-2 is slowly dripped, naOH is added to adjust the pH value to 9.5, and then the prepared water with the mineralization degree of 50000mg/L is added to quantitatively reach 100g, and the lignin-based composite channeling sealing agent is obtained after stirring uniformly. The initial viscosity of the lignin-based composite channeling sealing agent is 9.0 mPa.s at 25 ℃; the strength reaches 0.079MPa after the gel is formed at 180 ℃; and the gel is not broken after being kept at 300 ℃ for 60 days, and the dehydration rate is 1.9%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 99.36%. The strength of the lignin-based composite channeling sealing agent after gel formation at 300 ℃ can reach 0.076MPa.
Example 4
0.1g of amide thickener (AM-AMPS copolymer) is dissolved in 80g of preparation water with the mineralization degree of 80000mg/L, and stirred at a rotating speed of 500r/min until the mixture is uniformly dissolved; then adding 7g of enzymolysis lignin and 0.01g of isoascorbic acid; after stirring uniformly, 1.8g of modified cross-linking agent FQ-2 is slowly dripped, naOH is added to adjust the pH value to 9, and then the prepared water with the mineralization degree of 80000mg/L is added to quantitatively reach 100g, and the lignin-based composite channeling sealing agent is obtained after stirring uniformly. The initial viscosity of the lignin-based composite channeling sealing agent is 17.8 mPa.s at 25 ℃; the strength reaches 0.088MPa after the gel is formed at 120 ℃; and the gel is not broken after being kept at 300 ℃ for 60 days, and the dehydration rate is 1.1 percent; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 99.58%.
Example 5
0.07g of amide thickener (AM-AMPS copolymer) is dissolved in 80g of preparation water with the mineralization degree of 80000mg/L, and stirred at a rotating speed of 500r/min until the mixture is uniformly dissolved; then adding 4g of alkali lignin and 0.015g of sodium dithionite; after uniformly stirring, slowly dripping 0.5g of modified cross-linking agent FQ-2, adding NaOH to adjust the pH value to 9.5, adding prepared water with the mineralization degree of 80000mg/L to quantitatively reach 100g, and uniformly stirring to obtain the lignin-based composite channeling sealing agent. The initial viscosity of the lignin-based composite channeling sealing agent is 10.2 mPa.s at 25 ℃; the strength reaches 0.075MPa after gel forming at 120 ℃; and the gel is not broken after being kept at 300 ℃ for 60 days, and the dehydration rate is 2.9%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 99.09%.
Example 6
The preparation method of example 6 is the same as that of example 1, except that lignin is sodium lignin sulfonate, and the modified crosslinking agent is FQ-3, so as to obtain the lignin-based composite channeling sealing agent. The initial viscosity of the lignin-based composite channeling sealing agent is 17.1 mPa.s at 25 ℃; the strength reaches 0.074MPa after the gel is formed at 100 ℃; and the gel is not broken after being kept at 300 ℃ for 60 days, and the dehydration rate is 3.3%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 99.05%.
Comparative example 1
An experiment was conducted in accordance with the method of example 1, except that the modified cross-linking agent FQ-1 was replaced with an unmodified phenolic resin to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 11.4 mPa.s at 25 ℃; the strength after gel forming at 100 ℃ is 0.039MPa, and the gel breaking and dehydration rate after 60 days at 300 ℃ is 41.4%; and (5) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 83.99%.
Comparative example 2
An experiment was conducted in accordance with the method of example 2, except that the modified cross-linking agent FQ-1 was replaced with an unmodified phenolic resin to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 7.1 mPa.s at 25 ℃; the strength after gel forming at 150 ℃ is 0.032MPa, and the gel breaking and dehydration rate after 60 days at 300 ℃ is 37.1%; and (5) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 78.56%.
Comparative example 3
An experiment was conducted in accordance with the method of example 3, except that the modified cross-linking agent FQ-2 was replaced with an unmodified phenolic resin to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 7.2 mPa.s at 25 ℃; the strength after gel forming at 180 ℃ is 0.035MPa, and the gel breaking and dehydration rate after 60 days at 300 ℃ is 43.1%; and (5) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 80.03%.
Comparative example 4
An experiment was conducted in accordance with the method of example 4, except that the modified cross-linking agent FQ-2 was replaced with an unmodified phenolic resin to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 15.3 mPa.s at 25 ℃; the strength after gel forming at 120 ℃ is 0.051MPa, and the gel breaking and dehydration rate after 60 days at 300 ℃ is 33.4%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 84.16%.
Comparative example 5
Preparation of modified crosslinker FQ-4:
the preparation method of the crosslinking agent is basically the same as that of the preparation example 2, except that the raw material of the modified crosslinking agent does not contain organic bentonite.
An experiment was conducted in accordance with the method of example 4, except that modified crosslinker FQ-2 was replaced with modified crosslinker FQ-4 to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 13.4 mPa.s at 25 ℃; the strength after gel forming at 120 ℃ is 0.071MPa, the gel breaking and dehydration rate at 300 ℃ for 60 days is 16.5%; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 92.59%.
Comparative example 6
Preparation of modified crosslinker FQ-5:
the preparation method of the crosslinking agent prepared in preparation example 2 is basically the same, except that LNBR-40 (liquid nitrile rubber 40) is not contained in the raw material of the modified crosslinking agent.
An experiment was conducted in accordance with the method of example 4, except that modified crosslinker FQ-2 was replaced with modified crosslinker FQ-5 to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 12.1 mPa.s at 25 ℃; the strength after gel forming at 120 ℃ is 0.078MPa, and the gel breaking and dehydration rate is 18.6% after 60 days at 300 ℃; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 88.45%.
Comparative example 7
Preparation of modified crosslinker FQ-6:
the preparation method of the crosslinking agent was substantially the same as that of preparation example 2, except that the addition amount of LNBR-40 (liquid nitrile rubber 40) in the raw material of the modified crosslinking agent was 0.845g and the addition amount of water was 91.455g.
An experiment was conducted in accordance with the method of example 4, except that modified crosslinker FQ-2 was replaced with modified crosslinker FQ-6 to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 16.1 mPa.s at 25 ℃; the strength after gel forming at 120 ℃ is 0.080MPa, and the gel breaking and dehydration rate is 15.42% after 60 days at 300 ℃; and (3) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 90.24%.
Comparative example 8
Preparation of modified crosslinker FQ-7:
the preparation method of the crosslinking agent prepared in preparation example 2 is basically the same, except that the addition amount of organobentonite (tetradecyltrimethylammonium chloride as an intercalating agent) in the raw material of the modified crosslinking agent is 4.255g, and the addition amount of water is 89g.
An experiment was conducted in accordance with the method of example 4, except that modified crosslinker FQ-2 was replaced with modified crosslinker FQ-7 to obtain a channeling agent. The initial viscosity of the channeling sealing agent is 13.1 mPa.s at 25 ℃; the strength after gel forming at 120 ℃ is 0.075MPa, and the gel breaking and dehydration rate is 10.9% after 60 days at 300 ℃; and (5) performing plugging test on the obtained channeling sealing agent, wherein the plugging rate is 93.21%.
As can be seen from the comparison examples and the comparison examples, the viscosity of the lignin-based composite channeling sealing agent is 8.4-17.8 mPa.s at normal temperature (25 ℃), and the lignin-based composite channeling sealing agent has good pumpability; can be controlled to be gel (2-168 h) in a wider temperature range (90-300 ℃), and the gel strength is over 0.074-0.088 MPa; the gel is not broken at the high temperature of 300 ℃ for 60 days, the gel volume is basically unchanged, and the dehydration rate is less than 3.3%; the plugging rate is higher than 99.05%, the steam channeling channel can be effectively plugged for a long time, and the high-efficiency development of the heavy oil reservoir is realized.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (13)
1. A lignin-based composite channeling sealing agent, which is characterized in that: the lignin-based composite channeling sealing agent is prepared from the following raw materials in parts by weight;
lignin, a modified cross-linking agent, a thickening agent, a stabilizing agent and formulated water;
based on the total weight of the raw materials as 100 percent,
the addition amount of lignin is 3-9wt%;
the addition amount of the modified cross-linking agent is 0.5-2wt%;
the addition amount of the thickener is 0.001-0.15wt%;
the addition amount of the stabilizer is 0.001-0.05 wt%;
the preparation method of the modified cross-linking agent comprises the following steps:
premixing water, phenol, aldehyde, nitrile rubber and organic bentonite, adding a base catalyst, and heating for reaction; after the reaction is finished, regulating the pH value, and distilling to obtain the modified cross-linking agent;
wherein, the mass ratio of the phenol to the aldehyde to the nitrile rubber is 1: (1.5-4): (0.01-0.05);
the concentration of the phenol is 1.5-3wt%;
the concentration of the organic bentonite is 0.5-2.5wt%;
the nitrile rubber is selected from liquid nitrile rubber.
2. The lignin-based composite channeling blocking agent according to claim 1, wherein:
based on the total weight of the raw materials as 100 percent,
the addition amount of the lignin is 5.5-7wt%;
the addition amount of the modified cross-linking agent is 1-1.8wt%;
the addition amount of the thickener is 0.05-0.1wt%;
the addition amount of the stabilizer is 0.01-0.03wt percent.
3. The lignin-based composite channeling blocking agent according to claim 1, wherein:
the lignin is at least one of alkali lignin, enzymolysis lignin, sodium lignin sulfonate, chlorinated lignin, steam explosion lignin, wood grinding lignin or sulfur lignin; and/or
The thickener is an amide thickener, and the weight average molecular weight of the thickener is 500-3000 ten thousand.
4. The lignin-based composite channeling blocking agent according to claim 1, wherein:
the lignin is at least one of alkali lignin and enzymatic lignin; and/or
The thickening agent is at least one of acrylamide/2-acrylamide-2-methylpropanesulfonic acid copolymer, and the weight average molecular weight of the thickening agent is 1000-2000 ten thousand.
5. The lignin-based composite channeling blocking agent according to claim 1, wherein:
the stabilizer is at least one selected from sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium dithionite, isoascorbic acid or thiourea; and/or
The mineralization degree of the prepared water is lower than 200000mg/L.
6. The lignin-based composite channeling sealing agent according to claim 1, wherein,
the phenol is selected from at least one of phenol, hydroquinone, resorcinol or catechol; and/or
The aldehyde is selected from at least one of formaldehyde, acetaldehyde or furfural; and/or
The base catalyst is a soluble base.
7. The lignin-based composite channeling blocking agent according to claim 6, wherein,
the base catalyst is at least one selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate or sodium bicarbonate.
8. The lignin-based composite channeling sealing agent according to claim 1, wherein,
the mass ratio of the phenol to the aldehyde to the nitrile rubber is 1: (1.6-3): (0.02-0.04);
the concentration of the alkali catalyst is 0.5-1wt%;
the pH value is adjusted to 7.5-9.5.
9. The lignin-based composite channeling sealing agent according to claim 1, wherein,
the temperature of the heating reaction is 78-88 ℃ and the reaction time is 30-90min;
the distillation mode is reduced pressure distillation; distilling until the solid content is more than or equal to 40 percent.
10. The method for preparing the lignin-based composite channeling blocking agent according to any one of claims 1 to 9, comprising the steps of:
(1) Adding the thickener into the preparation water for fully dissolving, then adding lignin and the stabilizer, and uniformly mixing to prepare a mixed solution;
(2) And (3) dripping a modified cross-linking agent into the mixed solution, uniformly mixing, and then adjusting the pH value to obtain the lignin-based composite channeling sealing agent.
11. The method for preparing the lignin-based composite channeling sealing agent according to claim 10, wherein the method comprises the steps of,
in the step (2), the step of (C),
the pH value is adjusted to 8-11.
12. The method for preparing the lignin-based composite channeling sealing agent according to claim 11, wherein the method comprises the steps of,
in the step (2), the step of (C),
the pH value is adjusted to 9-10.
13. Use of the lignin-based composite channeling blocking agent according to any of claims 1-9 in heavy oil recovery.
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