CN115612469B - Temperature and mineralization response type low-initial-viscosity weak gel system and preparation method thereof - Google Patents
Temperature and mineralization response type low-initial-viscosity weak gel system and preparation method thereof Download PDFInfo
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- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000004044 response Effects 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000003756 stirring Methods 0.000 claims abstract description 50
- 238000005303 weighing Methods 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 41
- 239000003381 stabilizer Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 35
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 33
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 28
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 21
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 18
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 16
- 229920002401 polyacrylamide Polymers 0.000 claims description 16
- 239000003513 alkali Substances 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 14
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 12
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000011780 sodium chloride Substances 0.000 claims description 9
- 235000019270 ammonium chloride Nutrition 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 239000001110 calcium chloride Substances 0.000 claims description 7
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 235000010265 sodium sulphite Nutrition 0.000 claims description 7
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002585 base Substances 0.000 claims description 5
- 239000005011 phenolic resin Substances 0.000 claims description 5
- 229920001568 phenolic resin Polymers 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 4
- 235000019345 sodium thiosulphate Nutrition 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
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- 239000012267 brine Substances 0.000 claims description 3
- 235000010350 erythorbic acid Nutrition 0.000 claims description 3
- 229940026239 isoascorbic acid Drugs 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical group O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 2
- 229910021529 ammonia Inorganic materials 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000018109 developmental process Effects 0.000 abstract description 3
- 239000010779 crude oil Substances 0.000 abstract description 2
- 239000000499 gel Substances 0.000 description 134
- 239000003921 oil Substances 0.000 description 19
- 239000002253 acid Substances 0.000 description 7
- 239000000701 coagulant Substances 0.000 description 7
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 6
- 229920006322 acrylamide copolymer Polymers 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 235000011121 sodium hydroxide Nutrition 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- TUAMRELNJMMDMT-UHFFFAOYSA-N 3,5-xylenol Chemical compound CC1=CC(C)=CC(O)=C1 TUAMRELNJMMDMT-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 description 4
- QWVGKYWNOKOFNN-UHFFFAOYSA-N o-cresol Chemical compound CC1=CC=CC=C1O QWVGKYWNOKOFNN-UHFFFAOYSA-N 0.000 description 4
- IWDCLRJOBJJRNH-UHFFFAOYSA-N p-cresol Chemical compound CC1=CC=C(O)C=C1 IWDCLRJOBJJRNH-UHFFFAOYSA-N 0.000 description 4
- 235000017550 sodium carbonate Nutrition 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical group C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 description 2
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 239000004254 Ammonium phosphate Substances 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- 235000012501 ammonium carbonate Nutrition 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 2
- 235000019289 ammonium phosphates Nutrition 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 229920006037 cross link polymer Polymers 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920002866 paraformaldehyde Polymers 0.000 description 2
- 235000011118 potassium hydroxide Nutrition 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- Chemical & Material Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a temperature and mineralization response type low initial viscosity weak gel system and a preparation method thereof. The method is characterized in that: the components and the proportion are as follows by weight percent: the main agent is 0.05-0.15%, the cross-linking agent is 0.1-0.5%, the regulator is 0.05-0.2%, the stabilizer is 0.01-0.04%, and the rest is water. The preparation method comprises the following steps: (1) pouring a quantity of water into a container; (2) weighing 0.01-0.05% of stabilizer, and adding into water; (3) Weighing 0.05-0.15% of main agent, and adding into the solution in the step (2); (4) Weighing 0.1-0.5% of cross-linking agent, and adding into the solution in the step (3); (5) Weighing 0.05-0.2% of regulator, adding into the solution obtained in the step (4), stirring and dissolving to obtain a weak gel system. The temperature and mineralization response type low initial viscosity weak gel system has the characteristics of low gel forming temperature, long gel forming time, low initial viscosity, high final setting viscosity and the like, and can greatly improve the recovery ratio and the development benefit of crude oil.
Description
Technical field:
the invention relates to the technical field of tertiary oil recovery, in particular to a temperature and mineralization response type low initial viscosity weak gel system and a preparation method thereof.
The background technology is as follows:
at present, most of the oil fields in China are developed by water injection, and 80% -90% of water injected into an oil layer is generally absorbed by a high permeable layer due to the heterogeneity of the oil layer, so that the water injection profile is very uneven. In order to exert the functions of the middle-low permeable layer and improve the sweep efficiency of injected water, the high permeable layer must be blocked to a certain extent, so that the subsequent injected water enters the middle-low permeable layer, and chemical agents which are usually injected into a water injection well are called profile control agents, at present, the profile control agents mainly comprise five types of inorganic materials, organic materials, biological materials, composite materials and novel materials, wherein polymer gels in the organic materials are chemical profile control agent water shutoff materials which are most widely applied at home and abroad at present.
In the 70 s of the 20 th century, crosslinked polymers began to be used for profile control and water shutoff, and the successful use of polymer gels to reduce produced water has led to interest in this technology in the petroleum industry. The polymer gel is used for treating the stratum near the shaft, so that the selected stratum can be effectively plugged, and the produced water of the production well can be successfully reduced. With the development of technology, the polymer gel is further applied to deep profile control, and the recovery ratio is obviously improved. In recent years, with the continuous deep recognition, a concept of injecting weak gel into a water injection well is proposed, and the concepts of movable gel, injected crosslinked polymer, weak gel and the like proposed at home and abroad can be generally called as weak gel polymer. At present, the method is suitable for being used in low-temperature oil reservoir environmentWeak gels are mainly of the following classes: silicic acid sol, HPAM/Cr 3+ Weak gel, HPAM/Al 3+ Weak gel, HPAM/Zr 4+ Weak gels, HPAM/PEI weak gels and HPAM/phenolic weak gels. Wherein the silicic acid sol, HPAM/Zr 4+ The gel forming time of the weak gel and HPAM/phenolic resin is too fast under the environment of room temperature to 45 ℃, so that the weak gel and HPAM/phenolic resin are difficult to enter a hypertonic region, and the purpose of plugging is achieved. While HPAM/Cr 3+ Weak gel, HPAM/Al 3+ The gel forming time of the weak gel and HPAM/PEI weak gel under the environment of room temperature to 45 ℃ can reach about two days, but the gel forming time is still faster when the weak gel system enters the deep part of an oil layer, and the mineralization degree can also reduce the viscosity of the gel system. In order to solve the deep profile control problem of the oil layer, a weak gel system with low initial viscosity, namely a weak gel system with lower initial viscosity and higher final adhesiveness, which is responsive to temperature and mineralization degree, is needed.
The invention comprises the following steps:
the invention aims to overcome the problems in the background technology and provide a temperature and mineralization response type low initial viscosity weak gel system, which has the characteristics of low gel forming temperature, long gel forming time, low initial viscosity and high final setting viscosity. The invention also provides a preparation method of the temperature and mineralization response type low-initial-viscosity weak gel system.
The invention solves the problems by the following technical proposal: a temperature and mineralization response type low initial viscosity weak gel system comprises the following components in percentage by weight:
the main agent is 0.05-0.15%, the cross-linking agent is 0.1-0.5%, the regulator is 0.05-0.2%, the stabilizer is 0.01-0.04%, and the rest is water.
Preferably, the main agent is polyacrylamide and/or acrylamide copolymer;
preferably, the modifier consists of resorcinol, a coagulant and an acid; the weight percentages of resorcinol, coagulant and acid are: resorcinol is 0.01-0.03%, coagulant is 20-23%, and acid is 0.01-0.02%.
Preferably, the polyacrylamide is partially hydrolyzed polyacrylamide, and the acrylamide copolymer is one or more of 2-acrylamide-methylpropanesulfonic acid/acrylamide/maleic anhydride copolymer, acrylamide/2-acrylamide-2-methylpropanesulfonic acid/N, N-diethyl acrylamide copolymer and acrylamide/2-acrylamide-methylpropanesulfonic acid/vinyl pyrrolidone copolymer.
Preferably, the stabilizer is one or more of thiourea, isoascorbic acid, sodium sulfite and sodium bisulfite; the water is one or more of brine containing sodium chloride, sodium sulfate, sodium carbonate, sodium bicarbonate, calcium chloride, calcium sulfate, magnesium chloride and magnesium sulfate, and can also be oilfield injection sewage.
Preferably, the preparation method of the cross-linking agent comprises the following steps:
(1) Adding 20-25% by weight of phenol into a reaction kettle, and heating to 40-50 ℃;
(2) Adding 15-20% alkali into a reaction kettle, wherein the concentration of the alkali is 5-10%, and stirring for 20-30min at a constant temperature of 40-50 ℃;
(3) Heating the reaction kettle to 60 ℃, gradually adding 24-45% of aldehyde aqueous solution with the concentration of 30-40% by weight, adding the aldehyde for 5-15min, controlling the temperature at 55-65 ℃ after the aldehyde aqueous solution is added, and performing constant-temperature reaction for 30-120min;
(4) Adding 5-8% alkali with concentration of 5-10%, and heating to 70-80deg.C;
(5) Gradually adding 8-12% of aldehyde water solution with concentration of 30-40% and aldehyde adding time of 5-15min, controlling temperature at 80-85 ℃ after aldehyde water solution adding is completed, and reacting at constant temperature for 20-60min;
(6) And cooling the reaction kettle to 20-30 ℃ to obtain the cross-linking agent.
Preferably, the aldehyde can be one or more of formaldehyde, paraformaldehyde and trioxymethylene; the alkali can be one or more of sodium hydroxide, potassium hydroxide, ammonia water, sodium bicarbonate and sodium carbonate; the phenol may also be p-cresol or o-cresol.
Preferably, the preparation method of the regulator comprises the following steps:
(1) Adding 70-80% of water by weight into a reaction kettle, and heating to 35-45 ℃;
(2) Adding 20-23% of coagulant into the reaction kettle, stirring at 35-45 ℃ for 10-20min, and fully dissolving;
(3) Adding resorcinol accounting for 0.01-0.03 weight percent and acid accounting for 0.01-0.02 weight percent into a reaction kettle, stirring for 30-60min at the constant temperature of 35-45 ℃ and fully dissolving;
(4) And cooling the reaction kettle to 20-30 ℃ to obtain the regulator.
Preferably, the coagulant is one or more of ammonium chloride, ammonium sulfate, ammonium carbonate, ammonium phosphate, sodium thiosulfate, thiourea and sodium sulfite; the acid is one or more of oxalic acid, hydrochloric acid and citric acid; resorcinol can also be 3, 5-xylenol or m-cresol.
The invention also provides a preparation method of the temperature and mineralization response type low initial viscosity weak gel system, which comprises the following steps:
(1) Pouring a certain amount of water into the container;
(2) weighing 0.01-0.05% of stabilizer, adding into water, stirring at a certain temperature for dissolution;
(3) Weighing 0.05-0.15% of main agent by weight, adding into the solution obtained in the step (2), stirring and dissolving at a certain temperature;
(4) Weighing 0.1-0.5% of cross-linking agent by weight, adding into the solution in the step (3), and stirring and dissolving at a certain temperature;
(5) Weighing 0.05-0.2% of regulator by weight, adding into the solution obtained in the step (4), and stirring for dissolving at a certain temperature to obtain a weak gel system.
Preferably, the temperature at which the main agent, the cross-linking agent, the regulator, the stabilizer and the water components are mixed to form the weak gel in step 2-5 is 40-50 ℃.
Compared with the background technology, the invention has the following beneficial effects: the temperature and mineralization response type low initial viscosity weak gel system and the preparation method thereof have the following characteristics:
(1) The low initial viscosity weak gel system of the invention can not generate the phenomenon of gel thickening at the temperature lower than 40 ℃, but can obviously generate gel thickening after the gel system is at the temperature of 40-50 ℃ for 20 days, the viscosity can reach more than 500 mPa.s after 70 days, the low initial viscosity weak gel system can adapt to the profile control of a low-temperature oil reservoir at the temperature of 40-50 ℃, and can enter the deep part of the oil reservoir to form effective blocking, but can not block the oil reservoir. The low initial viscosity weak gel system has the characteristics of low gel forming temperature, long gel forming time, low initial viscosity, high final setting viscosity and the like, and can greatly improve the recovery ratio and the development benefit of crude oil.
(2) The low initial viscosity weak gel system does not need to adjust the pH value of the use environment, is simple to prepare, has low toxicity, environment friendliness and low cost, and is suitable for large-scale popularization.
The specific embodiment is as follows:
in order to make the technical scheme and advantages of the present invention more apparent, the following detailed description of the embodiments of the present invention will be provided. Unless defined otherwise, all technical terms used in the embodiments of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
A temperature and mineralization response type low initial viscosity weak gel system comprises the following components in percentage by weight: the main agent is 0.05-0.15%, the cross-linking agent is 0.1-0.5%, the regulator is 0.05-0.2%, the stabilizer is 0.01-0.05%, and the rest is water. The temperature and mineralization responsive low initial viscosity weak gel system is that the higher the temperature and mineralization, the lower the initial viscosity of the weak gel system, but the higher the final tackiness.
The main agent is polyacrylamide and/or acrylamide copolymer, and the polyacrylamide is partially hydrolyzed polyacrylamide. The acrylamide copolymer is one or more of 2-acrylamide-methylpropanesulfonic acid/acrylamide/maleic anhydride copolymer, acrylamide/2-acrylamide-2-methylpropanesulfonic acid/N, N-diethyl acrylamide copolymer and acrylamide/2-acrylamide-methylpropanesulfonic acid/vinyl pyrrolidone copolymer.
The stabilizer is one or more of thiourea, isoascorbic acid, sodium sulfite and sodium bisulfite.
The water is brine containing one or more of sodium chloride, sodium sulfate, sodium carbonate, sodium bicarbonate, calcium chloride, calcium sulfate, magnesium chloride and magnesium sulfate, and can also be oilfield injection sewage.
The preparation method of the cross-linking agent comprises the following steps:
(1) Adding 20-25% by weight of phenol into a reaction kettle, and heating to 40-50 ℃;
(2) Adding 15-20% alkali into a reaction kettle, wherein the concentration of the alkali is 5-10%, and stirring for 20-30min at a constant temperature of 40-50 ℃;
(3) Heating the reaction kettle to 60 ℃, gradually adding 24-45% of aldehyde aqueous solution with the concentration of 30-40% by weight, adding the aldehyde for 5-15min, controlling the temperature at 55-65 ℃ after the aldehyde aqueous solution is added, and performing constant-temperature reaction for 30-120min;
(4) Adding 5-8% alkali with concentration of 5-10%, and heating to 70-80deg.C;
(5) Gradually adding 8-12% of aldehyde water solution with concentration of 30-40% and aldehyde adding time of 5-15min, controlling temperature at 80-85 ℃ after aldehyde water solution adding is completed, and reacting at constant temperature for 20-60min;
(6) And cooling the reaction kettle to 20-30 ℃ to obtain the cross-linking agent.
The aldehyde in the cross-linking agent can be one or more of formaldehyde, paraformaldehyde and trioxymethylene; the alkali in the cross-linking agent can be one or more of sodium hydroxide, potassium hydroxide, ammonia water, sodium bicarbonate and sodium carbonate; the phenol may also be p-cresol or o-cresol.
The preparation method of the regulator comprises the following steps:
(1) Adding 70-80% of water by weight into a reaction kettle, and heating to 35-45 ℃;
(2) Adding 20-23% of coagulant into the reaction kettle, stirring at 35-45 ℃ for 10-20min, and fully dissolving;
(3) Adding resorcinol accounting for 0.01-0.03 weight percent and acid accounting for 0.01-0.02 weight percent into a reaction kettle, stirring for 30-60min at the constant temperature of 35-45 ℃ and fully dissolving;
(4) And cooling the reaction kettle to 20-30 ℃ to obtain the regulator.
The coagulant in the regulator is one or more of ammonium chloride, ammonium sulfate, ammonium carbonate, ammonium phosphate, sodium thiosulfate, thiourea and sodium sulfite; the acid in the regulator is one or more of oxalic acid, hydrochloric acid and citric acid; resorcinol in the modifier may also be 3, 5-xylenol or m-cresol.
A preparation method of a temperature and mineralization responsive low initial viscosity weak gel system comprises the following steps:
(1) Pouring a certain amount of water into the container;
(2) Weighing 0.01-0.05% stabilizer, adding into water, stirring at 40-50deg.C, and dissolving;
(3) Weighing 0.05-0.15% of main agent by weight, adding into the solution obtained in the step (2), stirring and dissolving at 40-50deg.C;
(4) Weighing 0.1-0.5% of cross-linking agent by weight, adding into the solution in the step (3), stirring and dissolving at 40-50 ℃;
(5) Weighing 0.05-0.2% of regulator by weight, adding into the solution obtained in the step (4), stirring and dissolving at 40-50 ℃ to obtain a weak gel system.
The low initial viscosity weak gel system prepared by the method has low initial viscosity, and the time of the low initial viscosity weak gel system can reach 20-30 days, so that the low initial viscosity weak gel system can fully enter the deep part of an oil reservoir. The viscosity of the low initial viscosity weak gel system is rapidly increased to 750 mPa.s after 20-30 days, which is beneficial to effectively plugging medium-high permeable layers of the low initial viscosity weak gel system in the deep part of an oil reservoir, can not plug the oil reservoir, and can greatly improve the recovery ratio of the low-permeability oil reservoir.
The preparation of crosslinker C for use in the low initial viscosity weak gel system of the examples below comprises the steps of:
(1) 221g of phenol is added into a reaction kettle, and the temperature is raised to 50 ℃;
(2) 189.5g of sodium hydroxide with the concentration of 7.4 percent is added into the reaction kettle, and the mixture is stirred for 20 minutes at the constant temperature of 50 ℃; the alkali is mainly used for adjusting the pH value and meeting the alkaline condition.
(3) Then heating to 60 ℃, gradually adding 420g of formaldehyde aqueous solution, wherein the concentration of the formaldehyde aqueous solution is 30-40%, the formaldehyde adding process time is 10min, and after the formaldehyde aqueous solution adding is completed, the temperature is controlled at 60 ℃, and the constant temperature reaction is carried out for 50min;
(4) 63.5g of sodium hydroxide with the concentration of 7.4 percent is added, and the temperature is increased to 80 ℃; under the catalysis of strong alkali sodium hydroxide, the twice strong alkali sodium hydroxide feeding method is adopted, so that the reaction heat and the free formaldehyde content can be reduced, the methylolation degree is improved, and the reaction is easy to control.
(5) Gradually adding 106g of formaldehyde aqueous solution, wherein the concentration of the formaldehyde aqueous solution is 30-40%, the formaldehyde adding process time is 5min, and after the formaldehyde aqueous solution adding is completed, the temperature is controlled at 80-85 ℃ and the constant temperature reaction is carried out for 45min; the second time of adding formaldehyde can control the condensation reaction of phenol after methylolation, improve the content of hydroxymethyl in the system and ensure the water solubility of the system.
(6) After the reaction is completed, the temperature is reduced to 30 ℃ to obtain the cross-linking agent C.
The reaction temperature is controlled differently in the preparation process of the cross-linking agent, and the temperature is raised to 50 ℃ for the first time, so that the phenol can be better dissolved; then heating to 60 ℃ for a period of time and then heating to 80-85 ℃, so that the reaction speed can be controlled, and the reaction degree can be improved; finally, the temperature is reduced to 30 ℃ to terminate the reaction. The initial temperature rise of the synthetic reaction of the phenolic resin is slow, when the temperature rises to 50-60 ℃, the exothermic temperature of the reaction automatically rises, if the temperature rise is too fast or too high, the polycondensation reaction is severe, the amount of free phenol is increased, the reaction degree is reduced, and the yield is reduced.
Preparation of modifier T for use in the low initial viscosity weak gel system of the following examples, comprising the steps of:
(1) 760g of pure water is added into the reaction kettle, and the temperature is raised to 40 ℃;
(2) 200g of ammonium chloride and 10g of sodium thiosulfate are sequentially added, and stirred at the constant temperature of 40 ℃ for 10min to be fully dissolved; the ammonium chloride has the function of regulating the pH value, and meanwhile, chloride ions in the ammonium chloride can catalyze the crosslinking reaction between resorcinol and the polymer, so that the active hydrogen in the system can leave easily.
(3) Sequentially adding 20g of resorcinol and 10g of oxalic acid, stirring at a constant temperature of 40 ℃ for 40min, and fully dissolving; resorcinol can rapidly generate phenolic resin at low temperature to generate crosslinking reaction with polymer, so as to play a role in stabilizing the viscosity of the system.
(4) And cooling the reaction kettle to 20-30 ℃ to obtain the regulator T.
The preparation temperature of the regulator is controlled at 40 ℃, so that resorcinol is in a high-activity state and is easy to oxidize, the reaction degree is improved, and meanwhile, the full dissolution of system components is facilitated, and the yield is improved.
Example 1
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) 500mL of water, 2.25g of sodium chloride and 0.03g of calcium chloride are poured into a container, and stirred and dissolved at the temperature of 45 ℃;
(2) Weighing 0.02% of stabilizer, namely thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.1%, wherein the main agent is polyacrylamide with the molecular weight of 2500 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) Weighing 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of cross-linking agent by weight percent respectively, adding into the solution in the step (3), stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.05%, 0.1% and 0.15% of regulator by weight, adding the regulator into the solution obtained in the step (4), and stirring and dissolving at the temperature of 45 ℃ to obtain low initial viscosity weak gel; wherein the regulator is regulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, ordiManufactured by manufactured company) at a shear rate of 10s -1 The initial viscosity and the viscosities of the low initial viscosity weak gel systems were measured for 20 days, 30 days, 55 days and 70 days at 45 ℃. The viscosity properties of the low initial viscosity weak gel system with 0.1% of the base agent are shown in Table 1.
TABLE 1
As is clear from Table 1, the initial viscosity of the low initial viscosity weak gel system was only about 18 mPas at 45 ℃. After 20 days, the viscosity of the low initial viscosity weak gel system slightly increases, and the viscosities of the other systems are 28-37 mPas except for the higher viscosity of the systems No. 1 and No. 3. After 30 days the viscosity of the low initial viscosity weak gel system increases significantly, the viscosity being between 115 and 175 mPas. The viscosity of the low initial viscosity weak gel system continued to increase significantly after 55 days, with viscosities ranging from 200 to 599 mPas. After 70 days, the viscosity of the low initial viscosity weak gel system continues to increase significantly, and the viscosity of the system is 300-750 mPa.s. The initial viscosity of the low initial viscosity weak gel system is lower, and the viscosity only slightly increases within 20 days, but the gel forming performance of the low initial viscosity weak gel system is enhanced after 20 days, the viscosity is rapidly increased, and the final viscosity can reach more than 300 mPas, even up to 750 mPas.
Example 2
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) 500mL of water, 2.25g of sodium chloride and 0.03g of calcium chloride are poured into a container, stirred and dissolved at the temperature of 45 ℃;
(2) Weighing 0.02% of stabilizer, namely thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.06%, wherein the main agent is polyacrylamide with the molecular weight of 2500 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) Weighing 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of cross-linking agent by weight percent respectively, adding into the solution in the step (3), stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.05%, 0.1% and 0.15% of regulator by weight, adding into the solution obtained in the step (4), and stirring at 45 ℃ to dissolve to obtain a weak gel system. Wherein the regulator is regulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (manufactured by Anton Paar, oryza Co.) at a shear rate of 10s -1 The initial viscosity and the viscosities of the low initial viscosity weak gel systems were measured for 20 days, 30 days, 55 days and 70 days at 45 ℃. The viscosity properties of the low initial viscosity weak gel system with 0.06% of the base agent are shown in Table 2.
TABLE 2
As is clear from Table 2, the initial viscosity of the low initial viscosity weak gel system was only about 8 to 9 mPas at 45 ℃. After 20 days, the viscosity of the low initial viscosity weak gel system slightly increases, and the viscosity is between 8.8 and 18.5 mPa.s. The viscosity of the low initial viscosity weak gel system also increased slightly after 30 days, and the viscosity was between 16 and 51.7 mPas. After 55 days, the viscosity of the low initial viscosity weak gel system is obviously increased, and the viscosity is between 143 and 202 mPas. After 70 days, the viscosity of the low initial viscosity weak gel system continues to increase significantly, and the viscosity of the system is 223-516 mPa.s. The initial viscosity of the low initial viscosity weak gel system is lower, and the viscosity is only slightly increased within 30 days, but the gel forming performance of the low initial viscosity weak gel system is obviously enhanced after 30 days, the viscosity is rapidly increased, and the final viscosity can reach more than 223 mPas, even 516 mPas at most.
Example 3
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) 500mL of water, 2.25g of sodium chloride and 0.03g of calcium chloride are poured into a container, stirred and dissolved at the temperature of 45 ℃;
(2) Weighing 0.02% of stabilizer, namely thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.08%, wherein the main agent is polyacrylamide with the molecular weight of 1200 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) Weighing 0.15%, 0.3% and 0.45% of cross-linking agent by weight, adding into the solution obtained in the step (3), and stirring at 45 ℃ for dissolution. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.15 weight percent of regulator, adding the regulator into the solution in the step (4), and stirring and dissolving at the temperature of 45 ℃ to obtain a weak gel system. Wherein the regulator is regulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (manufactured by Anton Paar, oryza Co.) at a shear rate of 10s -1 The initial viscosity and the viscosities of the low initial viscosity weak gel systems were measured for 20 days, 30 days, 55 days and 70 days at 45 ℃. The viscosity properties of the low initial viscosity weak gel system with 0.08% of the base agent are shown in Table 3.
TABLE 3 Table 3
As is clear from Table 3, the initial viscosity of the low initial viscosity weak gel system was only about 8 mPas at 45 ℃. After 20 days, the viscosity of the low initial viscosity weak gel system slightly increases, and the viscosity is between 13.9 and 20.3 mPas. After 30 days, the viscosity of the low initial viscosity weak gel system is obviously increased, and the viscosity is 55.5-66.6 mPa.s. After 55 days, the viscosity of the low initial viscosity weak gel system is obviously increased, and the viscosity is 130-151 mPa.s. After 70 days the viscosity of the low initial viscosity weak gel system continued to increase significantly, with viscosities of between 215 and 383 mpa.s. The initial viscosity of the low initial viscosity weak gel system is lower, and the viscosity only slightly increases within 20 days, but the gel forming performance of the low initial viscosity weak gel system is enhanced after 20 days, the viscosity gradually and rapidly increases, and the final viscosity can reach more than 215 mPas.
Example 4
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) Weighing 500mL Daqing oilfield site injection water, and pouring the water into a container;
(2) Weighing 0.01% of stabilizer, wherein the stabilizer is thiourea, adding the thiourea into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.08%, wherein the main agent is polyacrylamide with the molecular weight of 1200 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) Weighing 0.45% of cross-linking agent by weight, adding into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.15% of regulator by weight, adding the regulator into the solution obtained in the step (4), and stirring and dissolving at the temperature of 45 ℃ to obtain a weak gel system. Wherein the regulator is regulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (manufactured by Anton Paar, oryza Co.) at a shear rate of 10s -1 The initial viscosity and the viscosities of the low initial viscosity weak gel systems were measured for 20 days, 30 days, 55 days and 70 days at 45 ℃. The viscosity properties of the low initial viscosity weak gel system are shown in Table 4.
TABLE 4 Table 4
| Time (Tian) | 0 | 20 | 30 | 55 | 70 |
| Viscosity (mPa. S) | 7.8 | 9.9 | 12.5 | 110 | 371 |
As shown in Table 4, under the condition of injecting water in a Daqing oilfield site at 45 ℃, the initial viscosity of the low initial viscosity weak gel system is lower, and the viscosity only slightly increases within 30 days, but after 30 days, the gel forming performance of the low initial viscosity weak gel system is enhanced, the viscosity gradually and rapidly increases, and the final viscosity can reach more than 371 mPa.s.
Example 5
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) Weighing 500mL Daqing oilfield site injection water, and pouring the water into a container;
(2) Weighing 0.05% of stabilizer, wherein the stabilizer is sodium sulfite, adding the sodium sulfite into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.055%, wherein the main agent is polyacrylamide with the molecular weight of 2500 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) Weighing 0.45% of cross-linking agent by weight, adding into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.15% of regulator by weight, adding the regulator into the solution obtained in the step (4), and stirring and dissolving at the temperature of 45 ℃ to obtain a weak gel system. Wherein the regulator is regulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (manufactured by Anton Paar, oryza Co.) at a shear rate of 10s -1 The initial viscosity and the viscosities of the low initial viscosity weak gel systems were measured for 20 days, 30 days, 55 days and 70 days at 45 ℃. The viscosity properties of the low initial viscosity weak gel system are shown in Table 5.
TABLE 5
| Time (Tian) | 0 | 30 | 55 | 70 |
| Viscosity (mPa. S) | 8.1 | 11.5 | 79 | 235 |
As shown in Table 5, under the condition of injecting water in a Daqing oilfield site at 45 ℃, the initial viscosity of the low initial viscosity weak gel system is lower, and the viscosity only slightly increases within 30 days, but after 30 days, the gel forming performance of the low initial viscosity weak gel system is enhanced, the viscosity gradually and rapidly increases, and the final viscosity can reach more than 235 mPa.s.
Example 6
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) 500mL of water, 2.25g of sodium chloride and 0.03g of calcium chloride are poured into a container, stirred and dissolved at the temperature of 30 ℃;
(2) Weighing 0.02% of stabilizer, namely thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 30 ℃;
(3) Weighing a main agent with the weight percentage of 0.1%, wherein the main agent is polyacrylamide with the molecular weight of 2500 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 30 ℃;
(4) Weighing 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of cross-linking agent by weight percent respectively, adding into the solution in the step (3), stirring and dissolving at the temperature of 30 ℃. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.05%, 0.1% and 0.15% of regulator by weight, adding into the solution obtained in the step (4), and stirring at 30 ℃ to dissolve to obtain a weak gel system. Wherein the regulator is regulator T.
The low initial viscosity weak gel system was sealed and placed in a 30 ℃ incubator. Using an MCR-302 rheometer (manufactured by Anton Paar, oryza Co.) at a shear rate of 10s -1 The initial viscosity and the viscosity for 20 days, 30 days and 55 days of the low initial viscosity weak gel system were measured at a temperature of 30 ℃. The viscosity properties of the low initial viscosity weak gel system with a base agent of 0.1% and 30℃are shown in Table 6.
TABLE 6
As can be seen from Table 6, the low initial viscosity weak gel system as in example 1 showed no significant increase in viscosity at 30℃for 55 days, but the final viscosity could be 300 mPas or more, or even up to 750 mPas after the temperature was increased to 45 ℃. Therefore, the deep plugging of the oil layer can be realized, and the oil displacement efficiency is improved.
Example 7
The temperature and mineralization responsive low initial viscosity weak gel system is prepared by the following steps:
(1) 500mL of water and different salt contents are poured into a container, and stirred and dissolved at the temperature of 20 ℃, 30 ℃ and 45 ℃;
(2) Weighing 0.02% of stabilizer, namely thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving the stabilizer at 20 ℃, 30 ℃ and 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.06%, wherein the main agent is polyacrylamide with the molecular weight of 2500 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 20 ℃, 30 ℃ and 45 ℃;
(4) Weighing 0.3% and 0.5% of cross-linking agent by weight percent respectively, adding into the solution in the step (3), and stirring and dissolving at the temperature of 30 ℃. Wherein the cross-linking agent is cross-linking agent C.
(5) Weighing 0.15% of regulator by weight, adding into the solution obtained in the step (4), and stirring at 20 ℃, 30 ℃ and 45 ℃ for dissolution to obtain a weak gel system. Wherein the regulator is regulator T.
Sealing the low initial viscosity weak gel system, and placing into a constant temperature box at 20 ℃, 30 ℃ and 45 ℃. Using an MCR-302 rheometer (manufactured by Anton Paar, oryza Co.) at a shear rate of 10s -1 The viscosity of the low initial viscosity weak gel system was measured. The low initial viscosity weak gel system viscosities at different temperatures and salt content are shown in table 7.
TABLE 7
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As is clear from Table 7, the weak gel system had a viscosity of 24 mPas at 20℃and a mineralization of 950mg/L NaCl. When the temperature is raised to 30 ℃, the mineralization degree is raised to 4500mg/L NaCl and 60mg/L CaCl 2 The initial viscosity of the weak gel system is 10.4 mPas at 25 daysThe viscosity of (C) is 10.9-15.8 mPas. When the temperature is raised to 45 ℃, the mineralization degree is raised to 4500mg/LNaCl and 60mg/L CaCl 2 The initial viscosity of the weak gel system is 8.8 mPas, the viscosity of the weak gel system is 8.8-59.8 mPas when the weak gel system is 20 days, and the viscosity of the weak gel system is more than 500 mPas when the weak gel system is 77 days. The weak gel system has the temperature and mineralization response function, the initial viscosity is reduced when the temperature and mineralization are increased, but the final viscosity is increased, so that the weak gel system is beneficial to being injected into the deep part of the oil reservoir, the weak gel system with higher viscosity is formed in the deep part of the oil reservoir, and the deep profile control effect of the oil reservoir is realized.
The foregoing description is only for the convenience of those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A temperature and mineralization response type low initial viscosity weak gel system is characterized by comprising the following components in percentage by weight: the main agent is 0.05-0.15%, the cross-linking agent is 0.1-0.5%, the regulator is 0.05-0.2%, the stabilizer is 0.01-0.05%, and the rest is water;
the main agent is polyacrylamide;
the stabilizer is one or more of thiourea, isoascorbic acid, sodium sulfite and sodium bisulfite; the water is brine containing one or more of sodium chloride, sodium sulfate, sodium carbonate, sodium bicarbonate, calcium chloride, calcium sulfate, magnesium chloride and magnesium sulfate, and can also be oilfield injection sewage;
the regulator is prepared by the following steps:
1) 760g of pure water is added into the reaction kettle, and the temperature is raised to 40 ℃;
2) 200g of ammonium chloride and 10g of sodium thiosulfate are sequentially added, and stirred at the constant temperature of 40 ℃ for 10min to be fully dissolved; the ammonium chloride has a pH value adjusting function, and chloride ions in the ammonium chloride can catalyze the crosslinking reaction between resorcinol and the polymer, so that the active hydrogen in the system can leave;
3) Sequentially adding 20g of resorcinol and 10g of oxalic acid, stirring at a constant temperature of 40 ℃ for 40min, and fully dissolving; resorcinol can rapidly generate phenolic resin at low temperature to generate crosslinking reaction with polymer, so as to play a role in stabilizing the viscosity of the system;
4) Cooling the reaction kettle to 20-30 ℃ to obtain a regulator;
the preparation method of the cross-linking agent comprises the following steps:
(1) Adding 20-25% of phenol into a reaction kettle, and heating to 40-50 ℃;
(2) Adding 15-20% alkali into a reaction kettle, wherein the concentration of the alkali is 5-10%, and stirring for 20-30min at a constant temperature of 40-50 ℃;
(3) Heating the reaction kettle to 60 ℃, gradually adding 24-45% of aldehyde aqueous solution with the concentration of 30-40% by weight, adding the aldehyde for 5-15min, controlling the temperature at 55-65 ℃ after the aldehyde aqueous solution is added, and reacting for 30-120min at constant temperature;
(4) Adding 5-8% alkali with concentration of 5-10% and heating to 70-80 ℃;
(5) Gradually adding 8-12% of aldehyde aqueous solution with the concentration of 30-40% and the aldehyde adding time of 5-15min, controlling the temperature at 80-85 ℃ after the aldehyde aqueous solution is added, and reacting for 20-60min at constant temperature;
(6) Cooling the reaction kettle to 20-30 ℃ to obtain a cross-linking agent;
the aldehyde in the steps (3) - (5) is formaldehyde.
2. The temperature and mineralization responsive low initial viscosity weak gel system according to claim 1, wherein the polyacrylamide is a partially hydrolyzed polyacrylamide.
3. The temperature and mineralization responsive low initial viscosity weak gel system according to claim 1, wherein the base is one or more of sodium hydroxide, potassium hydroxide, ammonia, sodium bicarbonate and sodium carbonate.
4. A process for preparing a temperature and mineralization responsive low initial viscosity weak gel system according to any one of claims 1-3, comprising the steps of:
(1) Pouring a certain amount of water into the container;
(2) Weighing 0.01-0.05% of stabilizer, adding into water, stirring and dissolving at a certain temperature;
(3) Weighing a main agent with the weight percentage of 0.05-0.15%, adding the main agent into the solution in the step (2), and stirring and dissolving at a certain temperature;
(4) Weighing 0.1-0.5% of cross-linking agent by weight, adding into the solution in the step (3), stirring and dissolving at a certain temperature;
(5) Weighing 0.05-0.2% of regulator by weight, adding the regulator into the solution obtained in the step (4), and stirring and dissolving at a certain temperature to obtain a weak gel system.
5. The method for preparing a temperature-and-mineralization-responsive low-initial-viscosity weak gel system according to claim 4, wherein the temperature at which the main component, the crosslinking agent, the regulator, the stabilizer and the water component are mixed to form the weak gel system in the steps (2) to (5) is 40-50 ℃.
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