CN115612469A - 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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- CN115612469A CN115612469A CN202110801738.8A CN202110801738A CN115612469A CN 115612469 A CN115612469 A CN 115612469A CN 202110801738 A CN202110801738 A CN 202110801738A CN 115612469 A CN115612469 A CN 115612469A
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- temperature
- gel system
- weak gel
- initial viscosity
- low initial
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- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 39
- 230000004044 response Effects 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 48
- 238000005303 weighing Methods 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 239000003381 stabilizer Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 claims description 40
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 32
- 239000000243 solution Substances 0.000 claims description 32
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 27
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 24
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000007864 aqueous solution Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000003513 alkali Substances 0.000 claims description 15
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 14
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 12
- 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
- 239000002253 acid Substances 0.000 claims description 12
- 239000000701 coagulant Substances 0.000 claims description 12
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 229920006322 acrylamide copolymer Polymers 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 230000008569 process Effects 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
- 229920001577 copolymer Polymers 0.000 claims description 7
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 7
- 235000010265 sodium sulphite Nutrition 0.000 claims description 7
- TUAMRELNJMMDMT-UHFFFAOYSA-N 3,5-xylenol Chemical compound CC1=CC(C)=CC(O)=C1 TUAMRELNJMMDMT-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 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
- 235000019270 ammonium chloride Nutrition 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
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 claims description 6
- QWVGKYWNOKOFNN-UHFFFAOYSA-N o-cresol Chemical compound CC1=CC=CC=C1O QWVGKYWNOKOFNN-UHFFFAOYSA-N 0.000 claims description 6
- IWDCLRJOBJJRNH-UHFFFAOYSA-N p-cresol Chemical compound CC1=CC=C(O)C=C1 IWDCLRJOBJJRNH-UHFFFAOYSA-N 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 235000017550 sodium carbonate Nutrition 0.000 claims description 5
- 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
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical group C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 239000004254 Ammonium phosphate Substances 0.000 claims description 3
- 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
- 229930040373 Paraformaldehyde Natural products 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
- 239000001099 ammonium carbonate Substances 0.000 claims description 3
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 3
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 3
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 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
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 229920002866 paraformaldehyde Polymers 0.000 claims description 3
- 235000011118 potassium hydroxide 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
- 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 claims description 2
- 239000012267 brine Substances 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims description 2
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical group O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 238000002156 mixing Methods 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 115
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 24
- 239000003921 oil Substances 0.000 description 18
- 229920000642 polymer Polymers 0.000 description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000008098 formaldehyde solution Substances 0.000 description 3
- ZHCGVAXFRLLEFW-UHFFFAOYSA-N 2-methyl-3-(prop-2-enoylamino)propane-1-sulfonic acid Chemical compound OS(=O)(=O)CC(C)CNC(=O)C=C ZHCGVAXFRLLEFW-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229920006037 cross link polymer Polymers 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007031 hydroxymethylation reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011368 organic material Substances 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
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- 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 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 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
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 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
- 238000004519 manufacturing process Methods 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
- 238000005316 response function Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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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
-
- 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
-
- 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
Abstract
The invention relates to a temperature and mineralization degree response type low initial viscosity weak gel system and a preparation method thereof. The method is characterized in that: the components and the mixture ratio are as follows by weight percent: 0.05-0.15% of main agent, 0.1-0.5% of cross-linking agent, 0.05-0.2% of regulator, 0.01-0.04% of stabilizer and the balance of water. The preparation method comprises the following steps: (1) pouring a certain amount of water into a container; (2) weighing 0.01-0.05% of stabilizer, and adding into water; (3) Weighing 0.05-0.15% of the main agent, and adding the main agent 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) And (3) weighing 0.05-0.2% of regulator, adding the regulator into the solution in the step (4), and 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 gelling temperature, long gelling time, low initial viscosity, high final viscosity and the like, and can greatly improve the recovery efficiency and the development benefit of crude oil.
Description
The technical field is as follows:
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.
Background art:
at present, most oil fields in China are developed by water injection, and due to the heterogeneity of an oil layer, 80-90% of water injected into the oil layer is absorbed by a high-permeability layer, so that a water injection profile is very uneven. In order to exert the function of the medium-low permeable layer and improve the sweep coefficient of injected water, the high permeable layer needs to be blocked to a certain degree, so that subsequent injected water enters the medium-low permeable layer, a chemical agent which is usually injected into a water injection well is called a profile control agent, at present, the profile control agent mainly comprises five types of inorganic materials, organic materials, biological materials, composite materials and novel materials, wherein polymer gels in the organic materials are the most widely applied chemical profile control agent water blocking materials 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 by the petroleum industry community. The polymer gel is used for treating the stratum near the shaft, so that the selected stratum can be effectively plugged, and the success rate is reducedProduced water from the production well. With the development of the technology, the polymer gel is further applied to deep profile control, and the recovery rate is obviously improved. In recent years, with the increasing understanding, the concept of injecting weak gel into a water injection well is proposed, and the concepts of mobile gel, injection cross-linked polymer, weak gel and the like proposed at home and abroad can be collectively called as weak gel polymer. Currently, weak gels suitable for use in low temperature reservoir environments are mainly of the following classes: silicic acid sol, HPAM/Cr 3+ Weak gels, HPAM/Al 3+ Weak gels, HPAM/Zr 4+ Weak gels, HPAM/PEI weak gels and HPAM/phenolic weak gels. Wherein the silicic acid sol and HPAM/Zr 4+ The gelling time of the weak gel and the HPAM/phenolic resin is too fast in the environment of room temperature to 45 ℃, and the weak gel and the HPAM/phenolic resin are difficult to enter a high-permeability area, so that the aim of plugging is fulfilled. And HPAM/Cr 3+ Weak gels, HPAM/Al 3+ The gelling time of the weak gel and the HPAM/PEI weak gel in the environment of room temperature to 45 ℃ can reach about two days, but the gelling time is still relatively quick when the weak gel system enters the deep part of an oil layer, and the viscosity of the gel system can be reduced by the mineralization degree. In order to solve the problem of deep profile control of an oil layer, a temperature and mineralization response type weak gel system with low initial viscosity is needed, namely the higher the temperature and the mineralization is, the lower the initial viscosity of the weak gel system is, but the higher the final gelling viscosity is.
The invention content is as follows:
the invention aims to overcome the problems in the background art and provides a temperature and mineralization degree response type low initial viscosity weak gel system which has the characteristics of low gelling temperature, long gelling time, low initial viscosity and high final set viscosity. The invention also provides a preparation method of the temperature and mineralization response type low initial viscosity weak gel system.
The invention can solve the problems by the following technical scheme: a temperature and mineralization response type low initial viscosity weak gel system comprises the following components in percentage by weight:
0.05-0.15% of main agent, 0.1-0.5% of cross-linking agent, 0.05-0.2% of regulator, 0.01-0.04% of stabilizer and the balance of water.
Preferably, the main agent is polyacrylamide and/or acrylamide copolymer;
preferably, the conditioning agent consists of resorcinol, a coagulant and an acid; the resorcinol, the coagulant and the acid are in percentage by weight: resorcinol in 0.01-0.03 wt%, coagulant in 20-23 wt% and acid in 0.01-0.02 wt%.
Preferably, the polyacrylamide is partially hydrolyzed polyacrylamide, and the acrylamide copolymer is one or more of a 2-acrylamido-methylpropanesulfonic acid/acrylamide/maleic anhydride copolymer, an acrylamide/2-acrylamido-2-methylpropanesulfonic acid/N, N-diethylacrylamide copolymer, and an acrylamide/2-acrylamido-methylpropanesulfonic acid/vinylpyrrolidone copolymer.
Preferably, the stabilizer is one or more of thiourea, isoascorbic acid, sodium sulfite and sodium bisulfite; the water is saline water containing one or more of sodium chloride, sodium sulfate, sodium carbonate, sodium bicarbonate, calcium chloride, calcium sulfate, magnesium chloride and magnesium sulfate, and the water can also be oilfield injection sewage.
Preferably, the preparation method of the cross-linking agent comprises the following steps:
(1) Adding 20-25 wt% of phenol into a reaction kettle, and heating to 40-50 ℃;
(2) Adding 15-20 wt% of 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 wt% of aldehyde aqueous solution, wherein the concentration of the aldehyde aqueous solution is 30-40%, the aldehyde adding process time is 5-15min, after the aldehyde aqueous solution is added, controlling the temperature to be 55-65 ℃, and reacting at constant temperature for 30-120min;
(4) Adding 5-8 wt% of alkali with the concentration of 5-10% again, and heating to 70-80 ℃;
(5) Gradually adding 8-12 wt% of aldehyde aqueous solution again, wherein the concentration of the aldehyde aqueous solution is 30-40%, the aldehyde addition process time is 5-15min, and after the aldehyde aqueous solution is completely added, the temperature is controlled at 80-85 ℃, and the constant temperature reaction is carried out 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 wt% of water into a reaction kettle, and heating to 35-45 ℃;
(2) Adding 20-23 wt% coagulant into the reaction kettle, stirring at constant temperature of 35-45 deg.C for 10-20min, and dissolving completely;
(3) Adding resorcinol in 0.01-0.03 wt% and acid in 0.01-0.02 wt% into the reactor, stirring at constant temperature of 35-45 deg.C for 30-60min, and dissolving completely;
(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; the 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 a container;
(2 weighing 0.01-0.05% by weight of stabilizer, adding into water, and stirring at a certain temperature to dissolve;
(3) Weighing 0.05-0.15 wt% of main agent, adding into the solution in the step (2), and stirring at a certain temperature to dissolve;
(4) Weighing 0.1-0.5 wt% of cross-linking agent, adding into the solution in the step (3), and stirring and dissolving at a certain temperature;
(5) And (3) weighing 0.05-0.2 wt% of regulator, 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.
Preferably, the temperature at which the main agent, the crosslinking agent, the regulator, the stabilizer and the water component are mixed to form the weak gel in steps 2 to 5 is 40 to 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 gelatinizing and tackifying in the gel system at the temperature lower than 40 ℃, but can obviously gelatinize and tackify in the gel system at the temperature of 40-50 ℃ after 20 days, and the viscosity can reach more than 500mPa & s after 70 days, thus being suitable for the profile control of a low-temperature oil reservoir at the temperature of 40-50 ℃, and being capable of entering the deep part of the oil reservoir to form effective plugging without plugging the oil reservoir. The low initial viscosity weak gel system has the characteristics of low gelling temperature, long gelling time, low initial viscosity, high final viscosity and the like, and can greatly improve the recovery efficiency 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 using environment, is simple to prepare, has low toxicity and low cost, is environment-friendly, and is suitable for large-scale popularization.
The specific implementation mode is as follows:
in order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail. Unless defined otherwise, all technical terms used in the examples 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: 0.05-0.15% of main agent, 0.1-0.5% of cross-linking agent, 0.05-0.2% of regulator, 0.01-0.05% of stabilizer and the balance of water. The temperature and mineralization response type 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 gelling viscosity.
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-methyl propanesulfonic acid/acrylamide/maleic anhydride copolymer, acrylamide/2-acrylamide-2-methyl propanesulfonic acid/N, N diethyl acrylamide copolymer and acrylamide/2-acrylamide-methyl propanesulfonic 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 the water can also be oilfield injection sewage.
The preparation method of the cross-linking agent comprises the following steps:
(1) Adding 20-25 wt% of phenol into a reaction kettle, and heating to 40-50 ℃;
(2) Adding 15-20 wt% of 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 wt% of aldehyde aqueous solution, wherein the concentration of the aldehyde aqueous solution is 30-40%, the aldehyde addition process time is 5-15min, after the aldehyde aqueous solution is added, controlling the temperature at 55-65 ℃, and reacting at constant temperature for 30-120min;
(4) Adding 5-8 wt% of alkali with the concentration of 5-10% again, and heating to 70-80 ℃;
(5) Gradually adding 8-12 wt% of aldehyde aqueous solution again, wherein the concentration of the aldehyde aqueous solution is 30-40%, the aldehyde addition process time is 5-15min, and after the aldehyde aqueous solution is completely added, the temperature is controlled at 80-85 ℃, and the constant temperature reaction is carried out 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 wt% of water into a reaction kettle, and heating to 35-45 ℃;
(2) Adding 20-23 wt% coagulant into the reaction kettle, stirring at constant temperature of 35-45 deg.C for 10-20min, and dissolving completely;
(3) Adding resorcinol in 0.01-0.03 wt% and acid in 0.01-0.02 wt% into the reactor, stirring at constant temperature of 35-45 deg.C for 30-60min, and dissolving completely;
(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; the resorcinol in the regulator can also be 3, 5-xylenol or m-cresol.
A preparation method of a temperature and mineralization response type low initial viscosity weak gel system comprises the following steps:
(1) Pouring a certain amount of water into a container;
(2) Weighing 0.01-0.05 wt% of stabilizer, adding into water, stirring at 40-50 deg.C for dissolving;
(3) Weighing 0.05-0.15 wt% of main agent, adding into the solution in the step (2), and stirring and dissolving at 40-50 ℃;
(4) Weighing 0.1-0.5 wt% of cross-linking agent, adding into the solution in step (3), stirring at 40-50 deg.C for dissolving;
(5) And (5) weighing 0.05-0.2% of regulator by weight percentage, adding the regulator into the solution in the step (4), and stirring and dissolving at the temperature of 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 low viscosity time 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 after 20-30 days, and can reach 750 mPa.s at most, so that the low initial viscosity weak gel system is beneficial to effectively plugging a high and high permeable layer in the deep part of an oil reservoir, the oil layer is not blocked, and the recovery ratio of a low permeable oil layer can be greatly improved.
Preparation of crosslinker C for use in the low initial viscosity weak gel system of the following examples, comprising the steps of:
(1) Adding 221g of phenol into a reaction kettle, and then heating to 50 ℃;
(2) 189.5g of 7.4 percent sodium hydroxide is added into the reaction kettle and stirred for 20min at the constant temperature of 50 ℃; the addition of alkali is mainly used for adjusting the pH value to meet the alkaline condition.
(3) Heating to 60 ℃, gradually adding 420g of formaldehyde aqueous solution, wherein the concentration of the formaldehyde aqueous solution is 30-40%, the formaldehyde addition process time is 10min, and after the formaldehyde aqueous solution is added, controlling the temperature at 60 ℃ and reacting at constant temperature for 50min;
(4) Adding 63.5g of 7.4 percent sodium hydroxide, and then heating 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 content of free formaldehyde can be reduced, the degree of hydroxymethylation is improved, and the reaction is easy to control.
(5) Gradually adding 106g of formaldehyde solution, wherein the concentration of the formaldehyde solution is 30-40%, the formaldehyde adding process is carried out for 5min, and after the formaldehyde solution is added, the temperature is controlled to be 80-85 ℃, and the constant temperature reaction is carried out for 45min; the second addition of formaldehyde can control the condensation reaction of phenol after hydroxymethylation, improve the content of hydroxymethyl in the system and ensure the water solubility of the system.
(6) And after the reaction is finished, cooling to 30 ℃ to obtain the cross-linking agent C.
The reaction temperature is controlled to be different in different steps in the preparation process of the cross-linking agent, and the temperature is increased 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 ℃, wherein the reaction speed can be controlled, and the reaction degree can be improved; finally, the temperature is reduced to 30 ℃, and the reaction can be stopped. The initial temperature rise of the synthesis reaction of the phenolic resin is slow, the exothermic temperature of the reaction can rise automatically when the temperature rises to 50-60 ℃, and if the temperature rise is too fast or too high, the polycondensation reaction is violent, so that the amount of free phenol is increased, the reaction degree is reduced, and the yield is reduced.
Preparation of a 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) Sequentially adding 200g of ammonium chloride and 10g of sodium thiosulfate, stirring at constant temperature of 40 ℃ for 10min, and fully dissolving; the ammonium chloride has a pH value adjusting function, and meanwhile, chloride ions in the ammonium chloride can catalyze the crosslinking reaction between resorcinol and the polymer, so that the leaving of active hydrogen in a system is facilitated.
(3) Sequentially adding 20g of resorcinol and 10g of oxalic acid, stirring at the constant temperature of 40 ℃ for 40min, and fully dissolving; the resorcinol can rapidly generate phenolic resin at low temperature to perform cross-linking reaction with the polymer, thereby playing 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 the resorcinol is in a high-activity state and is easy to oxidize, the reaction degree is improved, meanwhile, the full dissolution of system components is facilitated, and the yield is improved.
Example 1
A temperature and mineralization response type low initial viscosity weak gel system is prepared by the following steps:
(1) Pouring 500mL of water, 2.25g of sodium chloride and 0.03g of calcium chloride into a container, and stirring and dissolving at the temperature of 45 ℃;
(2) Weighing 0.02 wt% of stabilizer which is thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing 0.1 wt% of a main agent, namely 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) And (3) weighing 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of cross-linking agent by weight percentage, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) Weighing 0.05 wt%, 0.1 wt% and 0.15 wt% of regulator, adding into the solution obtained in step (4), and stirring at 45 deg.C to dissolve to obtain low initial viscosity weak gel; wherein the modulator is modulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, austria) at a shear rate of 10s -1 Initial viscosity of the low initial viscosity weak gel system and viscosities of 20 days, 30 days, 55 days and 70 days were measured at a temperature of 45 ℃. The viscosity properties of the low initial viscosity weak gel system with 0.1% of the host 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 ℃. The viscosity of the low initial viscosity weak gel system is slightly increased after 20 days, and the viscosity of the other systems is between 28 and 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 is obviously increased, and the viscosity is between 115 and 175 mPas. The viscosity of the low initial viscosity weak gel system continues to obviously increase after 55 days, and the viscosity is between 200 and 599 mPas. After 70 days, the viscosity of the low initial viscosity weak gel system continues to obviously increase, and the viscosity of the system is between 300 and 750 mPas. The initial viscosity of different low initial viscosity weak gel systems is lower, the viscosity is only slightly increased within 20 days, but the gelling 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 300mPa & s, even can reach 750mPa & s at most.
Example 2
A temperature and mineralization response type 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 wt% of a stabilizer which is thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at 45 ℃;
(3) Weighing 0.06 wt% of a main agent, namely 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) And (3) weighing 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of cross-linking agent by weight percentage, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) And (3) weighing 0.05%, 0.1% and 0.15% of regulator in percentage by weight, respectively, 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 modulator is modulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, austria) at a shear rate of 10s -1 Initial viscosity of the low initial viscosity weak gel system and viscosities of 20 days, 30 days, 55 days and 70 days were measured at a temperature of 45 ℃. The viscosity properties of the low initial viscosity weak gel system with 0.06% of the base compound 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 ℃. The viscosity of the low initial viscosity weak gel system is slightly increased after 20 days, and the viscosity is between 8.8 and 18.5 mPas. The viscosity of the low initial viscosity weak gel system also slightly increases after 30 days, and the viscosity is between 16 and 51.7 mPas. The viscosity of the low initial viscosity weak gel system is obviously increased after 55 days, and the viscosity is between 143 and 202 mPas. After 70 days, the viscosity of the low initial viscosity weak gel system continues to obviously increase, and the viscosity of the system is 223-516 mPa.s. The initial viscosity of different low initial viscosity weak gel systems is lower, the viscosity is only slightly increased within 30 days, but the gelling 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 223mPa & s, even can reach 516mPa & s at most.
Example 3
A temperature and mineralization response type low initial viscosity weak gel system is prepared by the following steps:
(1) Pouring 500mL of water, 2.25g of sodium chloride and 0.03g of calcium chloride into a container, and stirring and dissolving at the temperature of 45 ℃;
(2) Weighing 0.02 wt% of stabilizer which is thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing 0.08 wt% of a main agent, wherein the molecular weight of the main agent is 1200 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) And (3) weighing 0.15 percent, 0.3 percent and 0.45 percent of cross-linking agent by weight percent, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) And (3) weighing the regulator with the weight percentage of 0.15, 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 modulator is modulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, austria) at a shear rate of 10s -1 Initial viscosity of the low initial viscosity weak gel system and viscosities of 20 days, 30 days, 55 days and 70 days were measured at a temperature of 45 ℃. The viscosity properties of the low initial viscosity weak gel system with 0.08% of the host are shown in 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 ℃. The viscosity of the low initial viscosity weak gel system is slightly increased after 20 days, 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 is between 55.5 and 66.6 mPas. The viscosity of the low initial viscosity weak gel system is obviously increased after 55 days, and the viscosity is between 130 and 151mPa & s. After 70 days, the viscosity of the low initial viscosity weak gel system continues to obviously increase, and the viscosity is between 215 and 383mPa & s. The initial viscosity of different low initial viscosity weak gel systems is low, the viscosity is only slightly increased within 20 days, but the gelling performance of the low initial viscosity weak gel system is enhanced after 20 days, the viscosity is gradually and rapidly increased, and the final viscosity can reach over 215 mPas.
Example 4
A temperature and mineralization response type low initial viscosity weak gel system is prepared by the following steps:
(1) Measuring 500mL of Daqing oilfield field injection water and pouring the water into a container;
(2) Weighing 0.01 wt% of stabilizer which is thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 45 ℃;
(3) Weighing 0.08 wt% of a main agent, wherein the molecular weight of the main agent is 1200 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at 45 ℃;
(4) And (3) weighing 0.45 wt% of cross-linking agent, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) And (3) weighing 0.15 wt% of regulator, adding the regulator into the solution in the step (4), and stirring and dissolving at 45 ℃ to obtain a weak gel system. Wherein the modulator is modulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, austria) at a shear rate of 10s -1 Initial viscosities of the low initial viscosity weak gel system and viscosities of 20 days, 30 days, 55 days, and 70 days were measured at 45 ℃. The low initial viscosity weak gel system viscosity properties are shown in table 4.
TABLE 4
| Time (sky) | 0 | 20 | 30 | 55 | 70 |
| Viscosity (mPa. S) | 7.8 | 9.9 | 12.5 | 110 | 371 |
As can be seen from Table 4, under the condition of injecting water into Daqing oilfield at 45 ℃, the initial viscosity of the low initial viscosity weak gel system is low, and the viscosity is only slightly increased within 30 days, but the gelling performance of the low initial viscosity weak gel system is enhanced after 30 days, the viscosity is gradually and rapidly increased, and the final viscosity can reach more than 371mPa & s.
Example 5
A temperature and mineralization response type low initial viscosity weak gel system is prepared by the following steps:
(1) Measuring 500mL of Daqing oilfield field injection water and pouring the water into a container;
(2) Weighing 0.05 wt% of a stabilizer which is sodium sulfite, adding into the water in the step (1), and stirring and dissolving at 45 ℃;
(3) Weighing a main agent with the weight percentage of 0.055%, wherein the molecular weight of the main agent is 2500 ten thousand, adding the main agent into the solution in the step (2), and stirring and dissolving at the temperature of 45 ℃;
(4) And (3) weighing 0.45 wt% of cross-linking agent, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 45 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) And (5) weighing 0.15% of regulator by weight, adding the regulator into the solution in the step (4), and stirring and dissolving at 45 ℃ to obtain a weak gel system. Wherein the modulator is modulator T.
The low initial viscosity weak gel system was sealed and placed in a 45 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, austria) at a shear rate of 10s -1 Initial viscosity of the low initial viscosity weak gel system and viscosities of 20 days, 30 days, 55 days and 70 days were measured at a temperature of 45 ℃. The low initial viscosity weak gel system viscosity properties are shown in table 5.
TABLE 5
| Time (sky) | 0 | 30 | 55 | 70 |
| Viscosity (mPa. S) | 8.1 | 11.5 | 79 | 235 |
From table 5, it can be seen that under the condition of injecting water into the Daqing oilfield at 45 ℃, the initial viscosity of the low initial viscosity weak gel system is low, and the viscosity is only slightly increased within 30 days, but the gelling performance of the low initial viscosity weak gel system is enhanced after 30 days, the viscosity is gradually and rapidly increased, and the final viscosity can reach more than 235mPa & s.
Example 6
A temperature and mineralization response type 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 30 ℃;
(2) Weighing 0.02 wt% of a stabilizer which is thiourea, adding the stabilizer into the water in the step (1), and stirring and dissolving at the temperature of 30 ℃;
(3) Weighing 0.1 wt% of a main agent, namely 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) And (3) weighing 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of cross-linking agent by weight percentage, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 30 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) And (3) weighing 0.05%, 0.1% and 0.15% of regulator in percentage by weight, respectively, adding the regulator into the solution in the step (4), and stirring and dissolving at the temperature of 30 ℃ to obtain a weak gel system. Wherein the modulator is modulator T.
The low initial viscosity weak gel system was sealed and placed in a 30 ℃ incubator. Using an MCR-302 rheometer (Anton Paar, austria) at a shear rate of 10s -1 Initial viscosity of the low initial viscosity weak gel system and viscosity of 20 days, 30 days and 55 days were measured at 30 ℃. The viscosity properties of the low initial viscosity weak gel system at 30 ℃ with 0.1% of the base component are shown in Table 6.
TABLE 6
As can be seen from Table 6, the low initial viscosity weak gel system similar to that of example 1 has no significant increase in viscosity at 30 ℃ for 55 days, but the final viscosity can reach 300 mPas or more, and even 750 mPas at most, when the temperature is increased to 45 ℃. This can realize the oil reservoir deep and transfer stifled, improves the displacement of reservoir oil efficiency.
Example 7
A temperature and mineralization response type low initial viscosity weak gel system is prepared by the following steps:
(1) Pouring 500mL of water and different salt contents into a container, and stirring and dissolving at the temperature of 20 ℃, 30 ℃ and 45 ℃;
(2) Weighing 0.02 wt% of stabilizer, thiourea, adding into the water in the step (1), and stirring and dissolving at 20 ℃, 30 ℃ and 45 ℃;
(3) Weighing 0.06 wt% of a main agent, namely 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) And (3) weighing 0.3 percent and 0.5 percent of cross-linking agent by weight percent respectively, adding the cross-linking agent into the solution in the step (3), and stirring and dissolving at the temperature of 30 ℃. Wherein the cross-linking agent is a cross-linking agent C.
(5) And (5) weighing 0.15% of regulator by weight, adding the regulator into the solution in the step (4), and stirring and dissolving at the temperature of 20 ℃, 30 ℃ and 45 ℃ to obtain a weak gel system. Wherein the modulator is modulator T.
Sealing the low initial viscosity weak gel system, and placing in a thermostat at 20 ℃, 30 ℃ and 45 ℃. An MCR-302 rheometer (manufactured by Anton Paar, austria) was used 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 contents are shown in table 7.
TABLE 7
As is clear from Table 7, the weak gel system had a viscosity of 24 mPas at a temperature of 20 ℃ and a degree of mineralization of 950mg/L NaCl. When the temperature is increased to 30 ℃, the degree of mineralization is increased to 4500mg/L NaCl and 60mg/L CaCl 2 The initial viscosity of the weak gel system is 10.4 mPas, and the viscosity at 25 days is 10.9-15.8 mPas. When the temperature was raised to 45 ℃ and the degree of mineralization increased to 4500mg/L NaCl and 60mg/L CaCl 2 The initial viscosity of the weak gel system is 8.8 mPas, the viscosity at 20 days is 8.8-59.8 mPas, and the viscosity at 77 days is more than 500 mPas. The weak gel system has the temperature and mineralization response function, the temperature and the mineralization are increased, the initial viscosity is reduced, but the final viscosity is increased, the weak gel system can be injected into the deep part of an oil reservoir, the weak gel system with higher viscosity is formed in the deep part of the oil reservoir, and the profile control effect of the deep part of the oil reservoir is realized.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A temperature and mineralization response type low initial viscosity weak gel system is characterized in that the components and the mixture ratio are as follows according to the weight percentage: 0.05-0.15% of main agent, 0.1-0.5% of cross-linking agent, 0.05-0.2% of regulator, 0.01-0.04% of stabilizing agent and the balance of water.
2. The temperature and mineralization-responsive low initial viscosity weak gel system according to claim 1, wherein the host agent is polyacrylamide and/or acrylamide copolymer; the regulator consists of resorcinol, a coagulant and an acid; the resorcinol, the coagulant and the acid are in percentage by weight: resorcinol in 0.01-0.03%, coagulant in 20-23%, and acid in 0.01-0.02%.
3. The temperature and mineralization response type low initial viscosity weak gel system of claim 2, wherein the polyacrylamide is partially hydrolyzed polyacrylamide; the acrylamide copolymer is one or more of a 2-acrylamide-methyl propanesulfonic acid/acrylamide/maleic anhydride copolymer, an acrylamide/2-acrylamide-2-methyl propanesulfonic acid/N, N diethyl acrylamide copolymer and an acrylamide/2-acrylamide-methyl propanesulfonic acid/vinyl pyrrolidone copolymer.
4. The temperature and mineralization response type low initial viscosity weak gel system according to claim 1, wherein 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 the water can also be oilfield injection sewage.
5. The temperature and mineralization response type low initial viscosity weak gel system according to claim 1, wherein the cross-linking agent is prepared by a method comprising the steps of:
(1) Adding 20-25 wt% of phenol into a reaction kettle, and heating to 40-50 ℃;
(2) Adding 15-20 wt% of alkali into a reaction kettle, wherein the concentration of the alkali is 5-10%, and stirring for 20-30min at the constant temperature of 40-50 ℃;
(3) Heating the reaction kettle to 60 ℃, gradually adding 24-45 wt% of aldehyde aqueous solution, wherein the concentration of the aldehyde aqueous solution is 30-40%, the aldehyde addition process time is 5-15min, after the aldehyde aqueous solution is added, controlling the temperature at 55-65 ℃, and reacting at constant temperature for 30-120min;
(4) Adding 5-8 wt% of alkali with concentration of 5-10%, and heating to 70-80 deg.C;
(5) Gradually adding 8-12 wt% of aldehyde aqueous solution again, wherein the concentration of the aldehyde aqueous solution is 30-40%, the aldehyde addition process time is 5-15min, and after the aldehyde aqueous solution is added, the temperature is controlled at 80-85 ℃, and the constant temperature reaction is carried out for 20-60min;
(6) And cooling the reaction kettle to 20-30 ℃ to obtain the cross-linking agent.
6. The temperature and mineralization degree responsive low initial viscosity weak gel system according to claim 5, wherein the aldehyde may 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.
7. The temperature and mineralization response type low initial viscosity weak gel system according to claim 1 or 2, wherein the conditioning agent is prepared by a method comprising the steps of:
(1) Adding 70-80 wt% of water into a reaction kettle, and heating to 35-45 ℃;
(2) Adding 20-23 wt% coagulant into the reaction kettle, stirring at constant temperature of 35-45 deg.C for 10-20min, and dissolving completely;
(3) Adding resorcinol in 0.01-0.03 wt% and acid in 0.01-0.02 wt% into the reactor, stirring at constant temperature of 35-45 deg.C for 30-60min, and dissolving completely;
(4) And cooling the reaction kettle to 20-30 ℃ to obtain the regulator.
8. The temperature and mineralization response type low initial viscosity weak gel system according to claim 7, wherein the coagulant is one or more selected from 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; the resorcinol can also be 3, 5-xylenol or m-cresol.
9. A preparation method of a temperature and mineralization response type low initial viscosity weak gel system comprises the following steps:
(1) Pouring a certain amount of water into a container;
(2) Weighing 0.01-0.05 wt% of stabilizer, adding into water, stirring at a certain temperature to dissolve;
(3) Weighing 0.05-0.15 wt% of main agent, adding into the solution in the step (2), and stirring at a certain temperature to dissolve;
(4) Weighing 0.1-0.5 wt% of cross-linking agent, adding into the solution in the step (3), and stirring and dissolving at a certain temperature;
(5) And (5) weighing 0.05-0.2% of regulator by weight, adding the regulator into the solution in the step (4), and stirring and dissolving at a certain temperature to obtain a weak gel system.
10. The method for preparing a temperature and mineralization-responsive low initial viscosity weak gel system according to claim 9, wherein the temperature for mixing the main agent, the cross-linking agent, the modifier, the stabilizer and the water component to form the weak gel system in the steps 2-5 is 40-50 ℃.
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