CN115305075A - Weak gel profile control and flooding agent for medium-temperature oil reservoir and preparation method thereof - Google Patents
Weak gel profile control and flooding agent for medium-temperature oil reservoir and preparation method thereof Download PDFInfo
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- CN115305075A CN115305075A CN202110502144.7A CN202110502144A CN115305075A CN 115305075 A CN115305075 A CN 115305075A CN 202110502144 A CN202110502144 A CN 202110502144A CN 115305075 A CN115305075 A CN 115305075A
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- Prior art keywords
- acid
- weak gel
- profile control
- aluminum
- organic
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- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 59
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229920000642 polymer Polymers 0.000 claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 150000007524 organic acids Chemical class 0.000 claims abstract description 26
- 229920002401 polyacrylamide Polymers 0.000 claims description 21
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 17
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 15
- 150000001299 aldehydes Chemical class 0.000 claims description 14
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N alpha-ketodiacetal Natural products O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 8
- 125000000129 anionic group Chemical group 0.000 claims description 8
- 150000002148 esters Chemical class 0.000 claims description 7
- ZUGAOYSWHHGDJY-UHFFFAOYSA-K 5-hydroxy-2,8,9-trioxa-1-aluminabicyclo[3.3.2]decane-3,7,10-trione Chemical compound [Al+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O ZUGAOYSWHHGDJY-UHFFFAOYSA-K 0.000 claims description 6
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 6
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 6
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
- 150000001261 hydroxy acids Chemical class 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 claims description 6
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 6
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 6
- 230000033558 biomineral tissue development Effects 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- 235000015165 citric acid Nutrition 0.000 claims description 4
- 229940015043 glyoxal Drugs 0.000 claims description 4
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 3
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 claims description 3
- WJQZZLQMLJPKQH-UHFFFAOYSA-N 2,4-dichloro-6-methylphenol Chemical compound CC1=CC(Cl)=CC(Cl)=C1O WJQZZLQMLJPKQH-UHFFFAOYSA-N 0.000 claims description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- JPYHHZQJCSQRJY-UHFFFAOYSA-N Phloroglucinol Natural products CCC=CCC=CCC=CCC=CCCCCC(=O)C1=C(O)C=C(O)C=C1O JPYHHZQJCSQRJY-UHFFFAOYSA-N 0.000 claims description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 3
- GQSZLMMXKNYCTP-UHFFFAOYSA-K aluminum;2-carboxyphenolate Chemical compound [Al+3].OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O GQSZLMMXKNYCTP-UHFFFAOYSA-K 0.000 claims description 3
- CSJKPFQJIDMSGF-UHFFFAOYSA-K aluminum;tribenzoate Chemical compound [Al+3].[O-]C(=O)C1=CC=CC=C1.[O-]C(=O)C1=CC=CC=C1.[O-]C(=O)C1=CC=CC=C1 CSJKPFQJIDMSGF-UHFFFAOYSA-K 0.000 claims description 3
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 claims description 3
- ZCLVNIZJEKLGFA-UHFFFAOYSA-H bis(4,5-dioxo-1,3,2-dioxalumolan-2-yl) oxalate Chemical compound [Al+3].[Al+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O ZCLVNIZJEKLGFA-UHFFFAOYSA-H 0.000 claims description 3
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 239000001530 fumaric acid Substances 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 3
- 239000011976 maleic acid Substances 0.000 claims description 3
- 239000001630 malic acid Substances 0.000 claims description 3
- 235000011090 malic acid Nutrition 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- QCDYQQDYXPDABM-UHFFFAOYSA-N phloroglucinol Chemical compound OC1=CC(O)=CC(O)=C1 QCDYQQDYXPDABM-UHFFFAOYSA-N 0.000 claims description 3
- 229960001553 phloroglucinol Drugs 0.000 claims description 3
- 235000019260 propionic acid Nutrition 0.000 claims description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000011975 tartaric acid Substances 0.000 claims description 3
- 235000002906 tartaric acid Nutrition 0.000 claims description 3
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 claims description 3
- 229940005605 valeric acid Drugs 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 2
- 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 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004971 Cross linker Substances 0.000 abstract description 5
- 239000003129 oil well Substances 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 abstract 2
- 239000000084 colloidal system Substances 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 abstract 1
- 238000006297 dehydration reaction Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 33
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 22
- 238000011084 recovery Methods 0.000 description 15
- 238000004132 cross linking Methods 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 10
- 230000035699 permeability Effects 0.000 description 9
- -1 phenolic aldehyde Chemical class 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 230000009969 flowable effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000001246 colloidal dispersion Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000005677 organic carbonates Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229940082509 xanthan gum Drugs 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Colloid Chemistry (AREA)
Abstract
The application provides a weak gel profile control agent for medium temperature oil reservoirs, which comprises the following components in parts by weight: 0.1 to 0.2 portion of polymer, 0.1 to 0.2 portion of organic acid aluminum cross linker, 0.05 to 0.2 portion of aldehyde organic cross linker, etc. The invention also provides a preparation method of the weak gel profile control agent, which comprises the following steps: adding water and a regulator into a container, and stirring for dissolving; adding a polymer, stirring until the polymer is fully dissolved, and standing; adding an organic aluminum acid crosslinking agent and an aldehyde organic crosslinking agent, and stirring to obtain the weak gel profile control agent. The weak gel profile control agent can react at 50-80 ℃ to generate weak gel, the initial setting time is controllable within 5-48 h, the initial setting colloid viscosity is 400-1000 mPa.s and can be adjusted, and no gel breaking and dehydration phenomenon is observed for 90 days, so that the weak gel profile control agent is particularly suitable for the deep profile control requirement of an oil well of a medium-temperature oil reservoir.
Description
Technical Field
The application relates to the technical field of oil extraction underground profile control and flooding in oil fields, in particular to a weak gel profile control and flooding agent for medium-temperature oil reservoirs and a preparation method thereof.
Background
With the development of oil fields, a large number of oil fields enter a development stage with high water content and high extraction degree, and the conventional process has great excavation difficulty. The chemical agent for profile control and water shutoff is used as an important technical means in the oil reservoir deep profile control and flooding technology and is applied more and more widely, wherein the weak gel profile control and flooding agent is a colloidal dispersion gel system which is formed by low-concentration polymers and a cross-linking agent, mainly comprises intramolecular cross-linking and is assisted by intermolecular cross-linking and has a non-three-dimensional network structure. The weak gel has two main profile control and flooding mechanisms: on one hand, the water plugging agent has certain strength, and has a certain plugging effect on a high-permeability channel in the stratum, so that subsequently injected water flows around to a medium-low permeability layer to play a role in profile control; on the other hand, due to the low crosslinking strength, the weak gel can also slowly move to the deep part of the stratum under the pushing of the subsequent injected water, and the oil displacement effect is achieved. The weak gel is widely used on site due to low concentration of chemical agents, low cost, simple preparation and capability of meeting the requirement of large-dose deep profile control of oil reservoirs.
The weak gel profile control and flooding agent is mainly divided into two types according to the reaction mechanism of a cross-linking agent: one is an organic phenolic aldehyde crosslinking agent which has crosslinking reaction with an amide group in a polymer molecule: the other is a metal organic crosslinking agent which performs a crosslinking reaction with carboxylic acid groups in polymer molecules. Dynamic research and application of gelation of composite crosslinking agent weak gel system in high-salt oil reservoir (the journal of Petroleum and Natural gas (32) P336-340) discloses an organic phenolic crosslinking agent system, wherein the profile control system is suitable for high-temperature oil reservoirs, and the gelation is slow or even not at low and medium-temperature oil reservoirs (less than or equal to 70 ℃). The metal cross-linking agent system is suitable for medium and low temperature oil reservoirs, and can quickly form gel at high temperature and is very unstable. Therefore, the two crosslinking agents are not suitable for medium-temperature oil reservoirs (50-80 ℃).
The on-site practice of integral plugging regulation of Mongolian sandstone reservoirs (oil drilling and production technology 1998.6 (20) P86-90) and the optimization and indoor evaluation of a movable gel system (Heilongjiang scientific and technical information 2007.4P47) disclose a chromium carboxylate system used on site, which has the phenomena of rapid gelling reaction and high initial setting viscosity at 50-80 ℃. And too fast crosslinking reaction speed can cause the profile control agent to generate local crosslinking reaction in a ground liquid preparation pool or a near-wellbore area, so that formed micelles are difficult to inject and cannot penetrate into a deep target layer of an oil well, and the expected profile control effect is achieved. Even if the proportion of the formula of the profile control and flooding agent used on site is adjusted, multiple experiments of changing the polymerization-crosslinking ratio, reducing the concentration of the polymer, changing the concentration of the stabilizer, adding a retardant and the like are respectively carried out, and the aim of controlling the gelling time and the gelling strength cannot be achieved by the experimental result. Therefore, the weak gel profile control and flooding agent suitable for medium-temperature oil reservoirs (50-80 ℃), controllable in gel forming time and controllable in gel forming strength is urgently needed to be developed.
Disclosure of Invention
In order to solve the technical problem, the application provides a weak gel profile control agent for medium-temperature oil reservoirs, which comprises the following components in parts by weight: 0.1 to 0.2 portion of polymer, 0.1 to 0.2 portion of organic acid aluminum cross-linking agent, 0.05 to 0.2 portion of aldehyde organic cross-linking agent, 0.1 to 0.2 portion of regulator and 100 portions of water.
According to one embodiment of the invention, the polymer comprises one or more selected from the group consisting of hydrolyzed or partially hydrolyzed polyacrylamides or salts or esters thereof, anionic or cationic polyacrylamides or salts or esters thereof, acrylamide or acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid or salts or esters thereof.
According to one embodiment of the invention, the polymer comprises an anionic polyacrylamide; according to another embodiment of the present invention, the anionic polyacrylamide comprises a partially hydrolyzed polyacrylamide having a molecular weight of about 0.2 million to about 30 million, and/or having a degree of hydrolysis of 20-35%.
According to one embodiment of the invention, the organic acid aluminum crosslinker is prepared from an organic acid or an aluminum-containing compound, wherein the organic acid is one or more of a monocarboxylic acid, a dicarboxylic acid, and a hydroxy acid; and/or the monocarboxylic acid is selected from formic acid, acetic acid, propionic acid, n-butyric acid, valeric acid or mixtures thereof and the dicarboxylic acid is selected from: oxalic acid, succinic acid, maleic acid, malonic acid, fumaric acid, glutaric acid, or mixtures thereof, and the hydroxy acid is selected from: glycolic acid, lactic acid, tartaric acid, malic acid, citric acid or mixtures thereof.
According to one embodiment of the invention, the organic acid aluminum cross-linking agent comprises one or more of aluminum citrate, aluminum tartrate, aluminum oxalate, aluminum benzoate and aluminum salicylate.
According to one embodiment of the invention, the aluminum organylate crosslinker comprises aluminum citrate.
According to an embodiment of the present invention, the aldehyde organic crosslinking agent includes at least one selected from phenol, resorcinol, and phloroglucinol, and at least one selected from formaldehyde, glyoxal, and terephthalaldehyde.
Another aspect of the present invention is to provide a preparation method of the weak gel profile control agent, comprising the following steps:
s1, adding water and a regulator into a container, and stirring for dissolving;
s2, adding a polymer, stirring until the polymer is fully dissolved, and standing;
and S3, adding an organic acid aluminum cross-linking agent and an aldehyde organic cross-linking agent, and stirring to obtain the weak gel flooding modifier.
According to one embodiment of the invention, the water of step 1 comprises water with a degree of mineralization below 10000 mg/L.
According to an embodiment of the invention, the rotation speed of stirring in the step 2 comprises 350-450 r/min, the stirring time comprises 30-60 minutes, and the standing time is 2-5 hours; according to one embodiment of the invention, the stirring time in the step 3 comprises 10-30 minutes, and the stirring speed comprises 400r/min.
In still another aspect, the invention provides the use of the weak gel profile control agent in medium-temperature oil reservoirs.
According to one embodiment of the invention, the use of the weak gel profile control agent in medium-temperature oil reservoirs comprises the use of profile control, water shutoff, fracturing, sand control and the like in medium-temperature oil reservoirs.
Compared with the prior art, the method has the following technical effects:
the preparation method is simple and convenient, and as shown in the subsequent examples of the invention, the characteristics of the weak gel profile control agent are at least reflected in four aspects: 1) The initial setting time can be controlled within 5 to 48 hours; 2) The gelling viscosity is 1000-3000mPa.s; 3) The viscosity retention rate is more than or equal to 60 percent in 30 days; 4) The viscosity remained 600 to 3000 mPas for 30 days. Other existing profile control agents in the field are too fast or too slow in gelling speed, or uncontrollable in gelling strength, poor in strength grade and stability of a gel system, and not suitable for the deep profile control requirements of oil wells of medium-temperature oil reservoirs.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to specific embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
In one embodiment of the present invention, a weak gel conditioner is provided having the following composition: 0.1 to 0.2 portion of polymer, 0.1 to 0.2 portion of organic acid aluminum cross-linking agent, 0.05 to 0.2 portion of aldehyde organic cross-linking agent, 0.1 to 0.2 portion of regulator and 100 portions of water.
According to a particular embodiment of the invention, the water comprises water having a degree of mineralization below 10000 mg/L; according to another embodiment of the invention, the water comprises water having a degree of mineralization of 8000mg/L, 6000mg/L, 4000mg/L, 2000mg/L, 1000mg/L, 500 mg/L.
According to a particular embodiment of the invention, the modifier comprises thiourea.
According to one embodiment of the invention, the polymer may be a synthetic water-soluble or water-dispersible polymer derivative of acrylamide, methacrylamide, partially hydrolyzed acrylamide or acrylate polymers. The polymer may be a natural polymer derivative of cellulose, such as carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose. The polymer may be a xanthan gum polymer and a "reactive carbonyl" compound having the function of an organic carbonate (e.g. propylene carbonate), an aldehyde (e.g. glyoxal), an anhydride (e.g. acetic anhydride and carbon dioxide) or an ester (e.g. ethyl acetate). Various other components may be included in the formulation of the composition, as desired by the user
According to one embodiment of the invention, the polymer of the invention comprises polyacrylamide; according to another embodiment of the present invention, the polyacrylamide comprises polyacrylamide having a molecular weight of about 0.2 million to about 30 million, or having a molecular weight of about 1 million to about 25 million, a molecular weight of about 10 million to about 25 million, a molecular weight of about 15 million to about 25 million, a molecular weight of about 18 million to about 25 million.
According to one embodiment of the invention, the polymer of the invention comprises an anionic polyacrylamide; according to another specific embodiment of the present invention, the polyacrylamide comprises cationic polyacrylamide.
According to one embodiment of the invention, the polymer of the invention comprises hydrolyzed or partially hydrolyzed polyacrylamide; according to another embodiment of the invention, the polymer of the invention comprises a partially hydrolyzed polyacrylamide having a degree of hydrolysis of 20 to 35%; according to another embodiment of the invention, the polymer of the invention comprises a partially hydrolyzed polyacrylamide having a degree of hydrolysis of 15 to 30%, 18 to 25%, 20 to 25%.
According to one embodiment of the invention, the organic aluminum salt comprises one or more of monocarboxylic acid, dicarboxylic acid and hydroxy acid; according to another particular embodiment of the invention, the monocarboxylic acid is chosen from formic acid, acetic acid, propionic acid, n-butyric acid, valeric acid or mixtures thereof, and according to another particular embodiment of the invention, the dicarboxylic acid is chosen from: oxalic acid, succinic acid, maleic acid, malonic acid, fumaric acid, glutaric acid, or mixtures thereof; according to another particular embodiment of the invention, said hydroxy acid is selected from: glycolic acid, lactic acid, tartaric acid, malic acid, citric acid or mixtures thereof.
In one embodiment of the invention, the aluminum organic acid crosslinking agent has an aluminum ion content of 4.2-6%. In another embodiment of the invention, the organic acid aluminum cross-linking agent comprises one or more of aluminum citrate, aluminum tartrate, aluminum oxalate, aluminum benzoate and aluminum salicylate; according to another embodiment of the present invention, the organic acid aluminum crosslinking agent comprises an aluminum citrate crosslinking agent.
In one embodiment of the present invention, the preparation of the aluminum citrate crosslinker comprises the steps of: adding a citric acid aqueous solution with the mass percentage concentration of 40-60% into a reaction kettle, slowly adding crystalline aluminum chloride while stirring, heating to 90-110 ℃, reacting for 2-4 h, and pumping out generated HCl steam through a condenser and an acid absorption pump; slowly adding 40-60% sodium aluminate aqueous solution, heating to 100-110 deg.C, reflux reacting for 4-6 h; stopping heating, cooling to 65-75 ℃, slowly adding ammonia water until the pH value of the solution reaches 6.5-7, and finishing the reaction.
According to an embodiment of the present invention, the aldehyde organic crosslinking agent includes at least one selected from phenol, resorcinol, and phloroglucinol, and at least one selected from formaldehyde, glyoxal, and terephthalaldehyde.
In another embodiment of the present invention, the aldehyde-based organic crosslinking agent includes an organic aldehyde-based crosslinking agent, and the mass percentage of the solid content of the water-soluble phenol resin in the organic aldehyde-based crosslinking agent is 40 to 55%.
In another embodiment of the present invention, the preparation of the organic aldehyde-based crosslinking agent comprises: adding phenol and 40-60% sodium hydroxide aqueous solution into a reaction kettle, heating to 40-50 ℃, and preserving heat for 10-30 min; slowly dripping 30-40% formaldehyde solution into the reaction kettle, wherein the temperature is controlled to be 45-55 ℃ in the dripping process; heating to 80-90 deg.c for 1-2 hr; heating to 90-100 deg.c for 10-20 min to obtain bright red transparent solution, and finishing the reaction.
In another embodiment of the present invention, there is provided a method for preparing a weak gel flooding agent, comprising the steps of:
s1, adding water and a regulator into a container, and stirring for dissolving;
s2, adding a polymer, stirring until the polymer is fully dissolved, and standing;
s3, adding an organic aluminum sulfate cross-linking agent and an aldehyde organic cross-linking agent, and stirring to obtain the weak gel profile control and flooding agent.
According to a specific embodiment of the invention, the rotation speed of stirring in the step 2 comprises 350-450 r/min, the stirring time comprises 30-60 minutes, and the standing time is 2-5 hours.
According to an embodiment of the present invention, the stirring time in the step 3 includes 10 to 30 minutes, and the stirring rotation speed includes 400r/min.
According to the requirements of users, the weak gel profile control agent can be used in medium-temperature oil reservoirs for profile control, water shutoff, fracturing, sand prevention and the like.
The technical solution of the present invention is further illustrated by the following specific examples:
example 1
0.15 portion of polymer; 0.20 part of organic acid aluminum crosslinking agent; 0.1 part of thiourea and 100 parts of water, and the temperature is 50 ℃.
The preparation method comprises the steps of firstly putting 1000g of clear water into a beaker, slowly adding 1g of thiourea while stirring, then slowly adding 1.5g of polymer while stirring, continuously stirring for 2 hours by using a stirrer to fully swell the polymer, adding 2g of organic acid aluminum crosslinking agent, uniformly stirring to obtain the gel profile control agent, and putting the gel profile control agent into a constant-temperature oven at a set temperature of 50 ℃.
The viscosity of the gel is detected by a Haake rheometer, the gelling viscosity of the obtained weak gel is 438mPa & S, the time for completing the crosslinking is 5h, a flowable gel is formed, and the highest viscosity in a period of 30 days is 2289mPa & S.
Example 2
0.12 part of polymer; 0.15 part of organic acid aluminum crosslinking agent; 0.18 part of organic phenolic crosslinking agent; 0.12 part of thiourea and 100 parts of water, and the temperature is 60 ℃.
The preparation method comprises the steps of firstly putting 1000g of clear water into a beaker, slowly adding 1.2g of thiourea while stirring, then slowly adding 1.2g of polymer while stirring, continuously stirring for 2 hours by using a stirrer to fully swell the polymer, adding 1.5g of organic acid aluminum crosslinking agent and 1.8g of organic phenolic crosslinking agent, uniformly stirring to obtain the gel profile control agent, and putting the gel profile control agent into a constant-temperature oven at a set temperature of 60 ℃.
The viscosity of the gel was measured using a Haake rheometer, and the resulting weak gel had a gelling viscosity of 578 mPaS, a crosslinking completion time of 30h, and a flowable gel was formed with a maximum viscosity of 2706 mPaS over a 30 day period.
Example 3
0.12 portion of polymer; 0.18 part of organic acid aluminum crosslinking agent; 0.12 part of organic phenolic crosslinking agent; 0.15 part of thiourea and 100 parts of water, and the temperature is 70 ℃.
The preparation method comprises the steps of firstly putting 1000g of clear water into a beaker, slowly adding 1.5g of thiourea while stirring, then slowly adding 1.2g of polymer while stirring, continuously stirring for 2 hours by using a stirrer to fully swell, adding 1.8g of organic acid aluminum crosslinking agent and 1.2g of organic phenol aldehyde crosslinking agent, uniformly stirring to obtain the gel profile control agent, and putting the gel profile control agent into a constant-temperature oven at a set temperature of 70 ℃.
The viscosity of the gel is detected by using a Haake rheometer, the gelling viscosity of the obtained weak gel is 545mPa & S, the time for completing the crosslinking is 24h, a flowable gel is formed, and the highest viscosity is 2368mPa & S within a period of 30 days.
Example 4
0.12 portion of polymer; 0.12 part of organic acid aluminum cross-linking agent; 0.15 part of organic phenolic crosslinking agent; 0.1 part of thiourea and 100 parts of water, and the temperature is 70 ℃.
The preparation method comprises the steps of firstly putting 1000g of clear water into a beaker, slowly adding 1g of thiourea while stirring, then slowly adding 1.2g of polymer while stirring, continuously stirring for 2 hours by using a stirrer to fully swell the polymer, adding 1g of organic acid aluminum crosslinking agent and 1.5g of organic phenol aldehyde crosslinking agent, uniformly stirring to obtain the gel profile control agent, and putting the gel profile control agent into a constant-temperature oven at a set temperature of 70 ℃.
The viscosity of the gel is detected by using a Haake rheometer, the gelling viscosity of the obtained weak gel is 706mPa & S, the time for completing the crosslinking is 18h, a flowable gel is formed, and the highest viscosity in a period of 30 days is 2436mPa & S.
Example 5
0.12 portion of polymer; 0.1 part of organic acid aluminum cross-linking agent; 0.15 part of organic phenolic crosslinking agent; 0.15 part of thiourea and 100 parts of water, and the temperature is 80 ℃.
The preparation method comprises the steps of firstly putting 1000g of clear water into a beaker, slowly adding 1.5g of thiourea while stirring, then slowly adding 1.2g of polymer while stirring, continuously stirring for 2 hours by using a stirrer to fully swell, adding 1g of organic acid aluminum crosslinking agent and 1.5g of organic phenol aldehyde crosslinking agent, uniformly stirring to obtain the gel profile control agent, and putting the gel profile control agent into a constant-temperature oven at a set temperature of 80 ℃.
The viscosity of the gel was measured using a Haake rheometer, and the weak gel obtained had a gelling viscosity of 896 mPaS, a time to complete crosslinking of 10h, and a flowable gel was formed with a maximum viscosity of 2336 mPaS over a 30 day period.
Example 6
Oil displacement performance test of weak gel profile control agent
Test samples: same as example 4
The experimental method comprises the following steps: displacement experiment
In order to simulate heterogeneous formation conditions, a high-low permeability model parallel displacement experiment is adopted, wherein the permeability of the high permeability model is 650 multiplied by 10 -3 μm 2 Permeability of hypotonic model 150X 10 -3 μm 2 And the experiment adopts a co-injection and separate mining mode for mining.
Respectively evacuating saturated water from the high-low permeability model by using an evacuating device, then placing the high-low permeability model into a constant temperature box, preheating the high-low permeability model at a constant temperature for 24 hours at an experimental temperature, respectively saturating crude oil by using a displacement experimental device, ageing the crude oil at the constant temperature for 24 hours, then connecting the high-low permeability model in parallel, displacing the oil with water until the comprehensive water content reaches 98%, and respectively calculating the water displacement recovery ratio; then 0.3 times of Pore Volume (PV) of the weak gel profile control agent of the embodiment 4 of the invention is injected, after gel forming is carried out for 24 hours, water is injected again for driving till the comprehensive water content reaches 98%, and the recovery rate is improved after the weak gel profile control agent of the invention is injected, and the experimental results are shown in Table 1.
Recovery factor calculation method (see SYT 6576-2016. Evaluation method for Polymer for enhanced oil recovery and Q/SY HB 0167-2013. Evaluation method for Mobile gel for oilfield):
E d -displacement efficiency (recovery factor), expressed in percentages;
V o volume of oil displaced in the core during displacement, in cubic centimeters (cm) 3 )；
V d Volume of saturated oil in core in cubic centimeters (cm) when bound water is produced 3 )；
V oi Core holder dead volume in cubic centimeters (cm) 3 )。
Table 1 oil displacement experiment data table
As can be seen from the displacement experiment data table in Table 1, the recovery ratio of the high-permeability model water flooding is 54.7%, the recovery ratio of the low-permeability model water flooding is 29.5%, and the comprehensive recovery ratio is 42.2%; the weak gel profile control agent is injected and then water flooding is carried out, the water flooding recovery ratio of a high-permeability model is 74.4%, the water flooding recovery ratio of a low-permeability model is 62.9%, and the comprehensive recovery ratio is 68.7%, on the basis of residual oil, the recovery ratio of the high-permeability model can be increased by 19.7%, the recovery ratio of the low-permeability model can be increased by 33.3%, and the comprehensive recovery ratio can be increased by 26.5%. Experimental results show that the weak gel profile control agent can effectively start a low-permeability layer and improve the crude oil recovery rate.
Example 7
Selecting an oil field in the second-order region of the North China oil field as an oil reservoir of an experiment purpose, wherein the experiment examination temperature is 69 ℃, the field water development experiment is used, the water type is NaHCO3 type, the mineralization degree is 2097.5mg/L, and Ca is 2+ ：47.36mg/L、Mg 2+ :92.38mg/L. The weak gel profile control agent of the invention and 7 sets of commercial moderate temperature weak gel profile control agents are prepared into gel performance comparison experiments. In order to conveniently compare the gelling performances of different profile control and flooding agents, 62523 type anionic polyacrylamide (molecular weight 2500 ten thousand and hydrolysis degree 23%) from Beijing Hengji corporation is uniformly selected, the using concentration of a polymer is 1200mg/L, the formula of each profile control and flooding agent system is shown in table 2, 8 parts of the prepared profile control and flooding agents are simultaneously placed into a constant-temperature oven at 69 ℃ for observation for 30 days, the viscosity of gel is detected by using a Haake rheometer, and the experimental result is shown in table 3.
TABLE 2 Experimental formulary of commercial moderate temperature weak gel profile control agent and profile control agent of the invention
TABLE 3 results of experiments on gelling Properties
The performance evaluation index of the targeted weak gel profile control agent is formulated according to the specific geological condition of the oil reservoir for developing deep profile control, and the performance detection and comparison of the profile control agent and 7 commercial systems are respectively developed in the aspects of initial setting time, gel forming viscosity, 30-day viscosity retention rate and 30-day viscosity. The specific detection indexes are as follows:
TABLE 4 Weak gel Performance evaluation criteria
Analyzing the experimental result: the No. 2 and No. 4 systems have too high gelling speed, and the No. 6 system has relatively low gelling speed and does not accord with the initial setting time index; the gelling viscosity of the No. 6 system is over 3000mPa.s, and the gelling viscosity requirement is not met; the viscosity retention rate of 7 sets of systems in 30 days is 63-97%, and both are higher than 60%, and both meet the requirement of the viscosity retention rate in 30 days. No. 1, no. 3, no. 5, no. 7 and No. 8 (the modifying and flooding agent of the invention) accord with the evaluation index of an A10 modifying and flooding scheme, the products are numbered No. 3, no. 8, no. 5, no. 1 and No. 7 according to the ranking of the gel forming performance, and the experimental result shows that the modifying and flooding agent of the invention has better performance than most of the similar commercial medium-low temperature cross-linking agent products.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A weak gel profile control agent for medium temperature oil reservoirs comprises the following components in parts by weight: 0.1 to 0.2 portion of polymer, 0.1 to 0.2 portion of organic acid aluminum cross-linking agent, 0.05 to 0.2 portion of aldehyde organic cross-linking agent, 0.1 to 0.2 portion of regulator and 100 portions of water.
2. The weak gel flooding agent according to claim 1, wherein the polymer comprises one or more selected from the group consisting of hydrolyzed or partially hydrolyzed polyacrylamides or salts or esters thereof, anionic or cationic polyacrylamides or salts or esters thereof, and acrylamide or acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid or salts or esters thereof.
3. A weak gel flooding agent as claimed in claim 1 or claim 2 wherein said polymer comprises anionic polyacrylamide.
4. The weak gel flooding agent according to claim 3, wherein said anionic polyacrylamide comprises a partially hydrolyzed polyacrylamide having a molecular weight of from about 0.2 million to about 30 million, and/or having a degree of hydrolysis of from 20 to 35%.
5. The weak gel flooding agent according to claim 1 or 2, wherein the organic acid aluminum cross-linking agent is prepared from an organic acid or an aluminum-containing compound, wherein the organic acid is one or more of monocarboxylic acid, dicarboxylic acid and hydroxy acid; and/or the monocarboxylic acid is selected from formic acid, acetic acid, propionic acid, n-butyric acid, valeric acid or mixtures thereof and the dicarboxylic acid is selected from: oxalic acid, succinic acid, maleic acid, malonic acid, fumaric acid, glutaric acid, or mixtures thereof, and the hydroxy acid is selected from: glycolic acid, lactic acid, tartaric acid, malic acid, citric acid or mixtures thereof.
6. The weak gel flooding agent of claim 5, wherein the organic acid aluminum cross-linking agent comprises one or more of aluminum citrate, aluminum tartrate, aluminum oxalate, aluminum benzoate and aluminum salicylate.
7. The weak gel flooding agent according to claim 1 or 2, wherein the aldehyde-based organic cross-linking agent comprises at least one selected from phenol, resorcinol, and phloroglucinol, and at least one selected from formaldehyde, glyoxal, and terephthalaldehyde.
8. A process for preparing a weak gel flooding agent as claimed in any one of claims 1 to 7, comprising the steps of:
s1, adding water and a regulator into a container, and stirring for dissolving;
s2, adding a polymer, stirring until the polymer is fully dissolved, and standing;
and S3, adding an organic acid aluminum cross-linking agent and an aldehyde organic cross-linking agent, and stirring to obtain the weak gel flooding modifier.
9. The weak gel flooding agent according to claim 8, wherein said water of step 1 comprises water having a degree of mineralization of less than 10000 mg/L.
10. The weak gel profile control and flooding agent according to claim 8, wherein the rotation speed of stirring in step 2 comprises 350-450 r/min, the stirring time comprises 30-60 minutes, and the standing time is 2-5 hours; and/or
The stirring time in the step 3 comprises 10-30 minutes, and the stirring speed comprises 400r/min.
11. The use of the weak gel profile control agent according to any one of claims 1 to 7 in medium-temperature oil reservoirs, wherein the use comprises the use of profile control, water shutoff, fracturing, sand control and the like in medium-temperature oil reservoirs.
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