CN116239721A - Water-based elastic gel particles, oil displacement material and preparation method thereof - Google Patents
Water-based elastic gel particles, oil displacement material and preparation method thereof Download PDFInfo
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- CN116239721A CN116239721A CN202111492156.2A CN202111492156A CN116239721A CN 116239721 A CN116239721 A CN 116239721A CN 202111492156 A CN202111492156 A CN 202111492156A CN 116239721 A CN116239721 A CN 116239721A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 239000007863 gel particle Substances 0.000 title claims abstract description 84
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000000178 monomer Substances 0.000 claims abstract description 36
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000007800 oxidant agent Substances 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 19
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 17
- 230000001590 oxidative effect Effects 0.000 claims abstract description 16
- 230000001965 increasing effect Effects 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 88
- 239000000499 gel Substances 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 24
- 239000012530 fluid Substances 0.000 claims description 20
- 230000000881 depressing effect Effects 0.000 claims description 19
- 238000009736 wetting Methods 0.000 claims description 19
- 230000008719 thickening Effects 0.000 claims description 18
- 238000004062 sedimentation Methods 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 15
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000084 colloidal system Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
- 229920002396 Polyurea Polymers 0.000 claims description 7
- 239000000017 hydrogel Substances 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical group C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical group CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 4
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 4
- JHUFGBSGINLPOW-UHFFFAOYSA-N 3-chloro-4-(trifluoromethoxy)benzoyl cyanide Chemical compound FC(F)(F)OC1=CC=C(C(=O)C#N)C=C1Cl JHUFGBSGINLPOW-UHFFFAOYSA-N 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 4
- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 claims description 4
- MQKXWEJVDDRQKK-UHFFFAOYSA-N bis(6-methylheptyl) butanedioate Chemical compound CC(C)CCCCCOC(=O)CCC(=O)OCCCCCC(C)C MQKXWEJVDDRQKK-UHFFFAOYSA-N 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 239000004359 castor oil Substances 0.000 claims description 4
- 235000019438 castor oil Nutrition 0.000 claims description 4
- 125000004386 diacrylate group Chemical group 0.000 claims description 4
- 125000000373 fatty alcohol group Chemical group 0.000 claims description 4
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- 239000011790 ferrous sulphate Substances 0.000 claims description 4
- 229910021485 fumed silica Inorganic materials 0.000 claims description 4
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 229940057995 liquid paraffin Drugs 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- -1 polyoxyethylene Polymers 0.000 claims description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- 229940047670 sodium acrylate Drugs 0.000 claims description 4
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims description 4
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 4
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 4
- 229940001584 sodium metabisulfite Drugs 0.000 claims description 4
- 235000010262 sodium metabisulphite Nutrition 0.000 claims description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- 239000001993 wax Substances 0.000 claims description 4
- 239000000230 xanthan gum Substances 0.000 claims description 4
- 229920001285 xanthan gum Polymers 0.000 claims description 4
- 235000010493 xanthan gum Nutrition 0.000 claims description 4
- 229940082509 xanthan gum Drugs 0.000 claims description 4
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 3
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 3
- SONHXMAHPHADTF-UHFFFAOYSA-M sodium;2-methylprop-2-enoate Chemical compound [Na+].CC(=C)C([O-])=O SONHXMAHPHADTF-UHFFFAOYSA-M 0.000 claims description 3
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 23
- 239000007924 injection Substances 0.000 abstract description 23
- 238000012674 dispersion polymerization Methods 0.000 abstract description 7
- 239000004094 surface-active agent Substances 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 239000011362 coarse particle Substances 0.000 abstract description 5
- 230000005465 channeling Effects 0.000 abstract description 4
- 238000006116 polymerization reaction Methods 0.000 abstract description 4
- 239000004576 sand Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 230000035699 permeability Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 230000032798 delamination Effects 0.000 description 4
- 239000004005 microsphere Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000010947 wet-dispersion method Methods 0.000 description 2
- 239000004908 Emulsion polymer Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000012688 inverse emulsion polymerization Methods 0.000 description 1
- 238000002356 laser light scattering Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- GBSRRQISIWGCNC-UHFFFAOYSA-N methyl propane-1-sulfonate Chemical compound CCCS(=O)(=O)OC GBSRRQISIWGCNC-UHFFFAOYSA-N 0.000 description 1
- 239000004530 micro-emulsion Substances 0.000 description 1
- 238000012703 microemulsion polymerization Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 239000003381 stabilizer Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/14—Organic medium
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention provides a water-based elastic gel particle, an oil displacement material and a preparation method thereof, wherein the water-based elastic gel particle consists of the following substances in percentage by mass: 60-70% of oil phase; 5-10% of acrylamide; 1-5% of functional monomer; 0.01-1% of cross-linking agent; 0.005-0.05% of oxidant; 0.005-0.05% of reducing agent; the balance being water. The invention mixes the cross-linking agent with the acrylamide and the functional monomer to generate the cross-linked body-type gel particles through polymerization reaction. The preparation method adopts a dispersion polymerization process without surfactant, adopts dispersion polymerization with a continuous phase as an oil phase to prepare coarse particles, and then forms the required particle size through a grinding process. The plugging agent can play a strong role in plugging water channeling channels, high-permeability strips and fractured reservoirs in the water injection exploitation process of the oil field, so that subsequent injected water is forced to be turned, the water injection wave volume is enlarged, the stratum residual oil is displaced, and the purpose of dewatering and increasing the oil is achieved.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to water-based elastic gel particles, an oil displacement material and a preparation method thereof.
Background
The pre-crosslinked gel material with polyacrylamide as a main body is widely applied to oil fields, and a good dewatering and oil increasing effect is achieved. In the application of oil reservoirs with relatively low stratum permeability, such as Changqing oil fields, in order to act on the deep part of the oil reservoir with more residual oil content, the oil reservoir is required to have good injectability, the existing preparation technology adopts reverse microemulsion or emulsion polymerization of 'water-in-oil', the product itself contains a large amount of oil and surfactant, the cost is increased, and meanwhile, certain hidden environmental pollution hazards are brought to the field injection of the oil field, and the auxiliary phase inversion surfactant is added, so that the product cannot meet water in the storage and transportation process and has poor weather resistance. In addition, due to the limitation of the preparation process conditions, the initial particle size of the polymer microsphere is relatively small, generally 50nm-5 mu m, and the blocking capability to the medium-high permeability stratum such as water channeling channels, high permeability strips and the like is weak.
For reservoirs with relatively high stratum permeability or fracture, the pre-crosslinked gel products currently adopt dry powder or gel solid particle materials with initial particle sizes of hundreds of micrometers. When the oil field is injected in site, dry powder or particles are manually poured into water in a storage tank, and are stirred and dispersed uniformly and then injected, and construction equipment needs a large-displacement injection pump, so that the energy consumption is high, the process is complicated, and the labor cost is high; moreover, the product has larger grain diameter and high elastic strength due to the limitation of the preparation process condition, can only form a certain degree of plugging on high water seepage strips or cracks in the near-wellbore zone, is difficult to enter into the deep part of the oil reservoir to play a role, and has single function.
The national intellectual property agency discloses an invention patent with the publication number of CN110144200A and the patent name of a copolymer elastic gel profile control agent for oilfield chemical oil recovery in 2019, month 6 and 14. The patent firstly adopts acrylamide, methacrylamide and vinyloxybenzene sulfonic acid copolymer, a cross-linking agent is not added in the polymerization process, then the copolymer and the cross-linking agent are mixed, the obtained copolymer elastic gel profile control agent is in a homogeneous flowing liquid state, and gradually forms gel under the action of stratum temperature and mineralization degree to form elastic gel, so that the profile control and water shutoff purposes of blocking a high water seepage channel are achieved, but the formed elastic gel cannot enter a narrow position of the water seepage channel, and the subsequent water injection steering is difficult to realize.
Disclosure of Invention
The invention aims to provide water-based elastic gel particles, which overcome the technical problems in the prior art.
The invention also aims to provide a preparation method of the water-based elastic gel particles, which adopts dispersion polymerization with a continuous phase as an oil phase to prepare coarse particles, and then the coarse particles are subjected to a grinding process to form the required particle size.
The invention further aims to provide a water-based elastic gel fluid displacement material which has the deep oil reservoir plugging performance, strong oil reservoir deep entering capacity and oil washing capacity.
The invention further aims at providing a preparation method of the water-based elastic gel fluid displacement material, which is easy to prepare and store.
Therefore, the technical scheme provided by the invention is as follows:
a water-based elastic gel particle consists of the following substances in percentage by mass:
60-70% of oil phase;
5-10% of acrylamide;
1-5% of functional monomer;
0.01-1% of cross-linking agent;
0.005-0.05% of oxidant;
0.005-0.05% of reducing agent;
the balance being water.
The oil phase is white oil, naphtha or liquid paraffin.
The functional monomer is sodium acrylate, sodium methacrylate, 2-acrylamido-2-methylpropanesulfonate, sodium allylsulfonate or sodium styrenesulfonate.
The cross-linking agent is a difunctional or polyfunctional water-soluble cross-linking agent, and the cross-linking agent is N, N-methylene bisacrylamide, polyethylene glycol diacrylate or pentaerythritol triacrylate.
The oxidant is ammonium persulfate, potassium persulfate or sodium persulfate;
the reducing agent is sodium sulfite, sodium bisulphite, sodium metabisulfite or ferrous sulfate.
A method for preparing water-based elastic gel particles, comprising the steps of:
step 1), adding acrylamide, functional monomers, a cross-linking agent and an oxidant in the formula amount into water, stirring and dissolving until the solution is clear, and obtaining a monomer solution;
step 2) adding the oil phase with the formula amount into a container, and adding the monomer solution while stirring, wherein the stirring speed is 500-800 rpm;
step 3) continuously introducing nitrogen for 25-35 minutes, reacting at the temperature of 25-30 ℃, adding a formula amount of reducing agent, increasing the temperature of the system to generate a large amount of gel particles, keeping the temperature of the system at 60-80 ℃ until the system reaches the highest temperature, continuously preserving heat for 1-1.5 hours, and cooling to room temperature by water cooling;
step 4) solid-liquid separation, filtering by adopting a 100-120 mesh screen, taking upper gel particles, and multiplexing a lower oil phase;
step 5) according to the mass ratio of gel particles to water of 1:2.5-3.5, grinding with colloid mill, and controlling tooth pitch of colloid mill to obtain elastic gel particles with particle diameter of 1-500 μm.
A water-based elastic gel fluid displacement material consists of the following substances in percentage by mass:
50-60% of water-based elastic gel particles;
1-5% of a wetting dispersion component;
0.1-1% of a thickening component;
15-20% of a pour point depressing component;
0.5-5% of anti-sedimentation component;
10-20% of water;
the water-based elastic gel particles are the water-based elastic gel particles according to any one of claims 1 to 5.
The wetting dispersion component is fatty alcohol polyoxyethylene ether, polyoxyethylene castor oil, diisooctyl succinate sulfonate or sodium dodecyl sulfonate.
The thickening component is polyacrylamide, polyvinyl alcohol, xanthan gum or hydroxyethyl cellulose;
the pour point depressing component is calcium chloride, magnesium chloride, ethylene glycol or glycerol;
the anti-sedimentation component is industrial sugar, fumed silica, polyamide wax or aqueous polyurea.
The preparation method of the water-based elastic gel fluid displacement material comprises the following steps:
step 1) adding the water-based elastic gel particles with the formula amount into water, and uniformly stirring to obtain hydrogel;
step 2) sequentially adding the wetting dispersion component, the thickening component, the pour point depressing component and the anti-settling component in the formula amount into the hydrogel, stirring, dissolving and dispersing; wherein, in the adding process, after each component is completely dissolved and dispersed, the next component is added;
and 3) adopting a high-speed dispersing machine, and stirring and dispersing for 15-20 minutes at the speed of 1000-3000 rpm.
The beneficial effects of the invention are as follows:
the water-based elastic gel particles provided by the invention are formed by mixing the cross-linking agent, the acrylamide and the functional monomer to generate polymerization reaction. The plugging agent can play a strong role in plugging water channeling channels, high-permeability strips and fractured reservoirs in the water injection exploitation process of the oil field, so that subsequent injected water is forced to be turned, the water injection wave volume is enlarged, the stratum residual oil is displaced, and the purpose of dewatering and increasing the oil is achieved.
The invention adopts a dispersion polymerization process without surfactant to prepare water-based elastic gel particles, adopts dispersion polymerization with a continuous phase as an oil phase to prepare coarse particles, and then forms the required particle size through a grinding process; elastic gel particles with different particle sizes can be provided according to the size of the target oil reservoir stratum permeability.
The water-based elastic gel fluid displacement material provided by the invention adopts low-cost and environment-friendly water as a continuous phase, and a certain amount of wetting dispersant, thickener, pour point depressant and other auxiliary agents are used for dispersing and suspending gel particles in the continuous phase, so that stable homogeneous phase fluid is formed.
The water-based elastic gel fluid oil displacement material is water-based, safe and environment-friendly, and the storage and transportation is not limited by the condition of meeting water; the particle size of the gel elastic particles suspended in the water phase is basically fixed, the gel elastic particles are not changed any more, and the gel elastic particles have certain crushing performance at the same time of having certain strength, so that the gel elastic particles have certain stratum self-adaption capability in the process of being injected into a sandstone porous medium in an oil reservoir stratum, high-discharge high-pressure injection is realized, gel fine particles subjected to pore-throat shearing crushing can still be blocked at a narrow place of a water seepage channel with proper size, subsequent water injection resistance is generated, subsequent water injection is forced to be turned, the water injection wave and volume are enlarged, the stratum residual oil is displaced, and the purpose of dewatering and increasing the oil is achieved.
In addition, by adding the pour point depressing component, the paint can still keep flowing in a low-temperature environment below-20 ℃ and has strong weather resistance; the added wetting dispersant not only plays a role in improving the wettability of the sandstone surface of the oil reservoir stratum, is beneficial to the gel particles entering the deep part of the oil reservoir, but also has a certain oil washing capacity; the added thickener has the functions of stabilizing gel particles and carrying the gel particles into the deep part of an oil reservoir, and the multifunctional property of the material is endowed by the compounding of various components, so that the thickener is a safe, environment-friendly and efficient oil displacement material for oil fields.
The water-based elastic gel fluid displacement material stabilizes homogeneous fluid, so that the injection process is simple, the injection pump is connected with the packaging ton barrel, the on-line continuous injection can be realized, and the construction is convenient and the cost is low.
As will be described in further detail below.
Drawings
Fig. 1 is a schematic diagram of a core water injection plugging experimental device used in an embodiment of the invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments is not intended to be limiting of the invention.
The invention provides water-based elastic gel particles, which consist of the following substances in percentage by mass:
60-70% of oil phase;
5-10% of acrylamide;
1-5% of functional monomer;
0.01-1% of cross-linking agent;
0.005-0.05% of oxidant;
0.005-0.05% of reducing agent;
the balance being water.
The oil phase is white oil, naphtha or liquid paraffin.
The functional monomer is sodium acrylate, sodium methacrylate, 2-acrylamido-2-methylpropanesulfonate, sodium allylsulfonate or sodium styrenesulfonate.
The cross-linking agent is a difunctional or polyfunctional water-soluble cross-linking agent, and the cross-linking agent is N, N-methylene bisacrylamide, polyethylene glycol diacrylate or pentaerythritol triacrylate.
The oxidant is ammonium persulfate, potassium persulfate or sodium persulfate;
the reducing agent is sodium sulfite, sodium bisulphite, sodium metabisulfite or ferrous sulfate.
Example 1:
the embodiment provides a water-based elastic gel particle, which consists of the following substances in percentage by mass:
70% of oil phase;
5% of acrylamide;
1% of functional monomer;
1% of a cross-linking agent;
0.05% of an oxidizing agent;
0.05% of a reducing agent;
22.9% of water.
In this embodiment, the oil phase is white oil, or a combination of the above oil phases; the functional monomer is sodium acrylate, and can also be the combination of the functional monomers; the cross-linking agent is N, N-methylene bisacrylamide, or the combination of the cross-linking agents; the oxidant is ammonium persulfate, or a combination of the above oxidants; the reducing agent is sodium sulfite, and can also be a combination of the reducing agents; the water is deionized water.
The preparation method comprises the following steps:
step 1), adding acrylamide, functional monomers, a cross-linking agent and an oxidant in the formula amount into water, stirring and dissolving until the solution is clear, and obtaining a monomer solution;
step 2) adding the oil phase with the formula amount into a container, and adding the monomer solution while stirring, wherein the stirring speed is 500 revolutions per minute;
step 3) continuously introducing nitrogen for 25 minutes, wherein the reaction initial temperature is 25 ℃, then adding a formula amount of reducing agent, quickly increasing the system temperature to generate a large amount of gel particles, keeping the temperature at 60 ℃ until the system reaches the highest temperature, continuously preserving heat for reaction for 1 hour, and then cooling to room temperature by water;
step 4) solid-liquid separation, filtering by adopting a 120-mesh screen, taking upper gel particles, and multiplexing a lower oil phase;
step 5) according to the mass ratio of gel particles to water of 1:3, grinding the mixture by using a colloid mill, and controlling the tooth pitch of the colloid mill to obtain elastic gel particles with the particle size of 1 mu m.
The water-based elastic gel particles prepared in this example were dispersed in deionized water, then a sample to be measured was added to water, ultrasonic dispersion was performed, the concentration of addition was determined to be appropriate for the system shading rate of 70% -90%, and the particle size was measured by a laser light scattering particle size analyzer (model LA-300 of HORIBA corporation, japan), to obtain a median particle size of 1 μm for the sample.
The invention generates crosslinked body type gel particles through mixing the crosslinking agent and the acrylamide and the functional monomer to generate polymerization reaction. The plugging agent can play a strong role in plugging water channeling channels, high-permeability strips and fractured reservoirs in the water injection exploitation process of the oil field, so that subsequent injected water is forced to be turned, the water injection wave volume is enlarged, the stratum residual oil is displaced, and the purpose of dewatering and increasing the oil is achieved.
The invention adopts a dispersion polymerization process without surfactant to prepare water-based elastic gel particles, adopts dispersion polymerization with a continuous phase as an oil phase to prepare coarse particles, and then forms the required particle size through a grinding process; elastic gel particles with different particle sizes can be provided according to the size of the target oil reservoir stratum permeability.
Example 2:
the embodiment provides a water-based elastic gel particle, which consists of the following substances in percentage by mass:
60% of oil phase;
7% of acrylamide;
2.98% of functional monomer;
0.01% of a crosslinking agent;
0.005% of an oxidizing agent;
0.005% of reducing agent;
30% of water.
In this embodiment, the oil phase is naphtha; the functional monomer is 2-acrylamide-2-sodium methylpropanesulfonate; the cross-linking agent is pentaerythritol triacrylate; the oxidant is sodium persulfate; the reducing agent is sodium metabisulfite.
The preparation method comprises the following steps:
step 1), adding acrylamide, functional monomers, a cross-linking agent and an oxidant in the formula amount into water, stirring and dissolving until the solution is clear, and obtaining a monomer solution;
step 2) adding the oil phase with the formula amount into a container, and adding the monomer solution while stirring, wherein the stirring speed is 800 revolutions per minute;
step 3) continuously introducing nitrogen for 30 minutes, reacting at the initial temperature of 30 ℃, adding a formula amount of reducing agent, increasing the temperature of the system to generate a large amount of gel particles, keeping the temperature of the system at 80 ℃, continuously preserving heat for reaction for 1.5 hours after the system reaches the highest temperature, and cooling to room temperature by water cooling;
step 4) solid-liquid separation, filtering by adopting a 100-mesh stainless steel screen mesh, taking gel particles at the upper layer, and multiplexing an oil phase at the lower layer;
step 5) according to the mass ratio of gel particles to water of 1:2.5, grinding the mixture by using a colloid mill, and controlling the tooth pitch of the colloid mill to obtain elastic gel particles with the particle size of 500 mu m.
The water-based elastic gel particles prepared in this example had a median particle diameter of 500. Mu.m, and were measured in the same manner as in example 1.
Example 3:
the embodiment provides a water-based elastic gel particle, which consists of the following substances in percentage by mass:
69.93% of oil phase;
10% of acrylamide;
5% of functional monomers;
0.05% of a cross-linking agent;
0.01% of an oxidizing agent;
0.01% of a reducing agent;
15% of water.
In this embodiment, the oil phase is liquid paraffin; the functional monomer is sodium allylsulfonate; the cross-linking agent is polyethylene glycol diacrylate; the oxidant is potassium persulfate; the reducing agent is sodium bisulphite.
The preparation method comprises the following steps:
step 1), adding acrylamide, functional monomers, a cross-linking agent and an oxidant in the formula amount into water, stirring and dissolving until the solution is clear, and obtaining a monomer solution;
step 2) adding the oil phase with the formula amount into a container, and adding the monomer solution while stirring, wherein the stirring speed is 650 revolutions per minute;
step 3) continuously introducing nitrogen for 35 minutes, reacting at the initial temperature of 28 ℃, adding a formula amount of reducing agent, increasing the temperature of the system to generate a large amount of gel particles, keeping the temperature of the system at 73 ℃ until the system reaches the highest temperature, continuously preserving heat for reaction for 1.2 hours, and cooling to room temperature by water cooling;
step 4) solid-liquid separation, filtering by adopting a 100-mesh screen, taking upper gel particles, and multiplexing a lower oil phase;
step 5) according to the mass ratio of gel particles to water of 1:3.5, grinding the mixture by using a colloid mill, and controlling the tooth pitch of the colloid mill to obtain elastic gel particles with the particle size of 150 mu m.
The water-based elastic gel particles prepared in this example had a median particle diameter of 150 μm and were measured in the same manner as in example 1.
Example 4:
the embodiment provides a water-based elastic gel particle, which consists of the following substances in percentage by mass:
67.9% of oil phase;
8% of acrylamide;
3% of functional monomers;
1% of a cross-linking agent;
0.05% of an oxidizing agent;
0.05% of a reducing agent;
20% of water.
In this embodiment, the oil phase is white oil; the functional monomer is sodium styrene sulfonate; the cross-linking agent is N, N-methylene bisacrylamide; the oxidant is ammonium persulfate; the reducing agent is ferrous sulfate.
The water-based elastic gel particles prepared in this example had a median particle diameter of 210. Mu.m, and were measured in the same manner as in example 1.
Example 5:
the embodiment provides a water-based elastic gel fluid displacement material which comprises the following substances in percentage by mass:
50-60% of water-based elastic gel particles;
1-5% of a wetting dispersion component;
0.1-1% of a thickening component;
15-20% of a pour point depressing component;
0.5-5% of anti-sedimentation component;
10-20% of water.
The wetting dispersion component is fatty alcohol polyoxyethylene ether, polyoxyethylene castor oil, diisooctyl succinate sulfonate or sodium dodecyl sulfonate.
The thickening component is polyacrylamide, polyvinyl alcohol, xanthan gum or hydroxyethyl cellulose;
the pour point depressing component is calcium chloride, magnesium chloride, ethylene glycol or glycerol;
the anti-sedimentation component is industrial sugar, fumed silica, polyamide wax or aqueous polyurea. Among them, aqueous polyureas are a modified product of polyureas, polyurea resin which can be dispersed in water, and related products on the market are transparent liquids.
The principle of the invention is as follows:
in order to stably suspend gel particles with relatively large particle size in a water system and smoothly enter the deep part of an oil reservoir, the gel particles have the functions of profile control and water shutoff. The oil displacement material is added with a wetting and dispersing component, and one of the purposes of the wetting and dispersing component is to emulsify the residual oil phase in the process of preparing the main elastic gel particles into a water system, so that the stability of the system is maintained; another object is to partially alter the wettability of the formation sandstone and increase the ability of gel particles to enter the deep reservoir; the added thickening component can stabilize gel particles and simultaneously can also play a role of carrying the particles into the deep part of the oil reservoir; the pour point depressing component is used to facilitate the low temperature construction of the material in the winter oilfield site and maintain certain low temperature flowability of the material.
Example 6:
on the basis of the embodiment 4, the embodiment provides a water-based elastic gel fluid displacement material which comprises the following substances in percentage by mass:
50% of water-based elastic gel particles;
4% of a wetting dispersion component;
a thickening component 1%;
a pour point depressing component 20%;
5% of an anti-sedimentation component;
20% of water.
The preparation method comprises the following steps:
step 1) adding the water-based elastic gel particles with the formula amount into water, and uniformly stirring to obtain hydrogel;
step 2) sequentially adding the wetting dispersion component, the thickening component, the pour point depressing component and the anti-settling component in the formula amount into the hydrogel, stirring, dissolving and dispersing; wherein, in the adding process, after each component is completely dissolved and dispersed, the next component is added;
and 3) adopting a high-speed dispersing machine with the speed of 1000 revolutions per minute, stirring and dispersing for 15 minutes to obtain the product, and barreling.
In this example, the water-based elastic gel particles were the water-based elastic gel particles prepared in example 1; the wetting dispersion component is fatty alcohol polyoxyethylene ether (AEO), specifically AEO-9, or one or more of AEO-5, AEO-7, AEO-9, AEO-11 and AEO-13; the thickening component is xanthan gum; the pour point depressing component is calcium chloride; the anti-sedimentation component is industrial sugar.
The whole oil displacement material is stable homogeneous flowing liquid, a BROOKFIELD DV 3T-type rotary viscometer is adopted for measurement at 25 ℃, a No. 2 rotor is adopted, the rotating speed is set to be 6 revolutions per minute, after the sample is kept at a constant temperature for 10 minutes, the value of the viscosity of the viscometer is recorded, and the viscosity 500mPa.s is obtained; the solidifying point is-20 ℃ (measured according to the GB/T510-2018 method), can be rapidly dispersed in oil field injection water, and has no obvious sedimentation and delamination at room temperature for 3 months.
Example 7:
on the basis of the embodiment 5, the embodiment provides a water-based elastic gel fluid displacement material which comprises the following substances in percentage by mass:
60% of water-based elastic gel particles;
a wet dispersion component 5%;
0.1% of a thickening component;
15% of a pour point depressing component;
0.5% of an anti-sedimentation component;
19.4% of water.
The preparation is identical to example 5, except that the high-speed disperser speed in step 3) is 1000 revolutions per minute.
In this example, the water-based elastic gel particles were the water-based elastic gel particles prepared in example 2; the wetting dispersion component is polyoxyethylene castor oil (EL), specifically EL-40, or one or more of EL-10, EL-20, EL-30, EL-40, EL-60, EL-80, and EL-90; the thickening component is polyacrylamide; the pour point depressing component is glycol; the anti-settling component is fumed silica.
The whole oil displacement material is stable homogeneous flowing liquid, and has viscosity of 3000 Pa.s at 25 ℃ (the measurement method is the same as that of example 6); the solidifying point is-25 ℃ (the measuring method is the same as that of example 6), the water can be rapidly dispersed in the injected water of an oil field, and no obvious sedimentation and delamination are caused in 3 months under the condition of room temperature.
Example 8:
on the basis of the embodiment 5, the embodiment provides a water-based elastic gel fluid displacement material which comprises the following substances in percentage by mass:
59.4% of water-based elastic gel particles;
a wet dispersion component 5%;
0.6% of a thickening component;
a pour point depressing component 20%;
5% of an anti-sedimentation component;
10% of water.
The preparation is identical to example 5, except that the high-speed disperser speed in step 3) is 2000 revolutions per minute.
In this example, the water-based elastic gel particles were the water-based elastic gel particles prepared in example 3; the wetting dispersion component is diisooctyl succinate sulfonate (AOT); the thickening component is polyvinyl alcohol; the pour point depressing component is magnesium chloride; the anti-sedimentation component is polyamide wax.
The whole oil displacement material is stable homogeneous flowing liquid, and has the viscosity of 2000mPa.s at 25 ℃ (the measuring method is the same as that of example 6); the freezing point-23 ℃ (the measurement method is the same as that of example 6), can be rapidly dispersed in the injected water of an oil field, and has no obvious sedimentation and delamination under the room temperature condition for 3 months.
Example 9:
on the basis of the embodiment 5, the embodiment provides a water-based elastic gel fluid displacement material which comprises the following substances in percentage by mass:
58% of water-based elastic gel particles;
wetting the dispersed component 1%;
a thickening component 1%;
18% of a pour point depressing component;
4% of an anti-sedimentation component;
18% of water.
The preparation is identical to example 5, except that the high-speed disperser speed in step 3) is 1500 revolutions per minute.
In this example, the water-based elastic gel particles were the water-based elastic gel particles prepared in example 4; the wetting dispersion component is Sodium Dodecyl Sulfate (SDS)); the thickening component is hydroxyethyl cellulose; the pour point depressing component is glycerol; the anti-sedimentation component is aqueous polyurea.
The whole oil displacement material is stable homogeneous flowing liquid, and has the viscosity of 1450MPa.s at 25 ℃ (the measuring method is the same as that of example 6); the solidifying point is-26 ℃ (the measuring method is the same as that of example 6), the water can be rapidly dispersed in the injected water of an oil field, and no obvious sedimentation and delamination are caused in 3 months under the condition of room temperature.
Performance test:
1. comparison of physical Properties
The basic physical properties of the water-based elastic gel particles prepared in example 9 are compared with those of comparative examples 1 and 2, and are shown in Table 1. The comparative example 1 adopts inverse emulsion polymerization to generate emulsion polymer microspheres which are used for profile control and flooding of low permeability oil fields and are obtained by polymerizing the following substances in percentage by mass: 15-35% of aqueous solution monomer, 1-8% of temperature-resistant salt-resistant monomer, 0.3-3% of polymerizable surfactant, 0.2-3% of cross-linking agent, 1-6% of emulsifying agent, 0.5-3% of stabilizing agent, 15-35% of deionized water, 25-65% of oil phase and 0.001-0.05% of initiator. See patent 2020113669137 for specific preparation methods. Comparative example 2 is polyacrylamide dry powder, which is an 80-150 mesh Bao Mo brand product produced by victory oil fields.
Table 1 physical property comparison
As can be seen from Table 1, the water-based elastic gel fluid displacement material prepared by the invention is a flowing liquid, has simple injection mode, no change in water, excellent weather resistance, no change in the particle size of gel particles due to the effect of water dispersion and stable physical properties.
2. Deep capacity and plugging rate of oil reservoir
Through the core water injection plugging experiment, the experimental device is shown in fig. 1, and the capacity (injectability) and the plugging rate of the three materials entering the deep part of the oil reservoir are compared.
Core length l=30 cm, cross-sectional area a= 11.3354cm 2 The device has two pressure sensors for recording pressure changes in the experimental process, the inlet end of the sand pipe is a first pressure measuring point P1, the middle part of the sand pipe is a second pressure measuring point P2, and the injectability of the material can be seen and the plugging rate can be calculated through the pressure changes of the two pressure measuring points. The initial water average permeability of the sand pipe is 2911mD, the injection speed is 2ml/min, the concentration of the plugging material is 3000mg/L, the injection slug is 0.2PV, and the specific results are shown in Table 2:
TABLE 2 blocking Rate
As can be seen from the above table data, the pressure value at the first pressure measurement point P1 at the inlet end of the sand pipe rises to different degrees after the three materials are injected. The polymer microsphere material of the comparative example 1 is injected, the pressure rise amplitude is smaller, but the first pressure measuring point and the second pressure measuring point are raised to different degrees, which indicates that a part of polymer microspheres enter the middle and rear parts of the sand pipe to form a plug; the gel dry powder of comparative example 2, the pressure rise of the first pressure measurement point P1 is very large, and the second pressure measurement point hardly changes, which means that most of the gel injected into the sand pipe is blocked at the inlet end of the sand pipe and does not enter the middle and rear parts of the sand pipe, and the blocking rate is very high but the capability of entering the deep part of the oil reservoir is very weak; by adopting the water-based elastic gel fluid displacement material, the first pressure measuring point P1 and the second pressure measuring point P2 of the sand pipe are both raised to a large extent, the overall plugging rate of the sand pipe is 99%, the gel injected into the sand pipe is wider in distribution range, effective water injection resistance can be formed at the rear part of the sand pipe, and certain oil reservoir deep entering capacity is realized while certain plugging strength is maintained.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (10)
1. A water-based elastic gel particle characterized in that: the material comprises the following substances in percentage by mass:
60-70% of oil phase;
5-10% of acrylamide;
1-5% of functional monomer;
0.01-1% of cross-linking agent;
0.005-0.05% of oxidant;
0.005-0.05% of reducing agent;
the balance being water.
2. A water-based elastic gel particle according to claim 1, wherein: the oil phase is white oil, naphtha or liquid paraffin.
3. A water-based elastic gel particle according to claim 1, wherein: the functional monomer is sodium acrylate, sodium methacrylate, 2-acrylamido-2-methylpropanesulfonate, sodium allylsulfonate or sodium styrenesulfonate.
4. A water-based elastic gel particle according to claim 1, wherein: the cross-linking agent is a difunctional or polyfunctional water-soluble cross-linking agent, and the cross-linking agent is N, N-methylene bisacrylamide, polyethylene glycol diacrylate or pentaerythritol triacrylate.
5. A water-based elastic gel particle according to claim 1, wherein: the oxidant is ammonium persulfate, potassium persulfate or sodium persulfate;
the reducing agent is sodium sulfite, sodium bisulphite, sodium metabisulfite or ferrous sulfate.
6. A method of preparing water-based elastic gel particles according to claim 1, wherein: the method comprises the following steps:
step 1), adding acrylamide, functional monomers, a cross-linking agent and an oxidant in the formula amount into water, stirring and dissolving until the solution is clear, and obtaining a monomer solution;
step 2) adding the oil phase with the formula amount into a container, and adding the monomer solution while stirring, wherein the stirring speed is 500-800 rpm;
step 3) continuously introducing nitrogen for 25-35 minutes, reacting at the temperature of 25-30 ℃, adding a formula amount of reducing agent, increasing the temperature of the system to generate a large amount of gel particles, keeping the temperature of the system at 60-80 ℃ until the system reaches the highest temperature, continuously preserving heat for 1-1.5 hours, and cooling to room temperature by water cooling;
step 4) solid-liquid separation, filtering by adopting a 100-120 mesh screen, taking upper gel particles, and multiplexing a lower oil phase;
step 5) according to the mass ratio of gel particles to water of 1:2.5-3.5, grinding with colloid mill, and controlling tooth pitch of colloid mill to obtain elastic gel particles with particle diameter of 1-500 μm.
7. A water-based elastic gel fluid displacement material is characterized in that: the material comprises the following substances in percentage by mass:
50-60% of water-based elastic gel particles;
1-5% of a wetting dispersion component;
0.1-1% of a thickening component;
15-20% of a pour point depressing component;
0.5-5% of anti-sedimentation component;
10-20% of water;
the water-based elastic gel particles are the water-based elastic gel particles according to any one of claims 1 to 5.
8. The water-based elastic gel fluid displacement material according to claim 7, wherein: the wetting dispersion component is fatty alcohol polyoxyethylene ether, polyoxyethylene castor oil, diisooctyl succinate sulfonate or sodium dodecyl sulfonate.
9. The water-based elastic gel fluid displacement material according to claim 7, wherein: the thickening component is polyacrylamide, polyvinyl alcohol, xanthan gum or hydroxyethyl cellulose;
the pour point depressing component is calcium chloride, magnesium chloride, ethylene glycol or glycerol;
the anti-sedimentation component is industrial sugar, fumed silica, polyamide wax or aqueous polyurea.
10. The method for preparing the water-based elastic gel fluid displacement material according to claim 7, wherein the method comprises the following steps: comprises the following steps:
step 1) adding the water-based elastic gel particles with the formula amount into water, and uniformly stirring to obtain hydrogel;
step 2) sequentially adding the wetting dispersion component, the thickening component, the pour point depressing component and the anti-settling component in the formula amount into the hydrogel, stirring, dissolving and dispersing; wherein, in the adding process, after each component is completely dissolved and dispersed, the next component is added;
and 3) adopting a high-speed dispersing machine, and stirring and dispersing for 15-20 minutes at the speed of 1000-3000 rpm.
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