CN112708016B - Oil extraction gel ball with temperature resistance and salt resistance and preparation method thereof - Google Patents
Oil extraction gel ball with temperature resistance and salt resistance and preparation method thereof Download PDFInfo
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- CN112708016B CN112708016B CN202011595528.XA CN202011595528A CN112708016B CN 112708016 B CN112708016 B CN 112708016B CN 202011595528 A CN202011595528 A CN 202011595528A CN 112708016 B CN112708016 B CN 112708016B
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- 238000000605 extraction Methods 0.000 title claims abstract description 40
- 150000003839 salts Chemical class 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 239000003999 initiator Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000008367 deionised water Substances 0.000 claims abstract description 18
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000000178 monomer Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 9
- 239000000499 gel Substances 0.000 claims description 58
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000000661 sodium alginate Substances 0.000 claims description 12
- 235000010413 sodium alginate Nutrition 0.000 claims description 12
- 229940005550 sodium alginate Drugs 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical group [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 claims description 8
- 239000001527 calcium lactate Chemical group 0.000 claims description 8
- 229960002401 calcium lactate Drugs 0.000 claims description 8
- 235000011086 calcium lactate Nutrition 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 7
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 7
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 5
- BQZJOQXSCSZQPS-UHFFFAOYSA-N 2-methoxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(OC)C(=O)C1=CC=CC=C1 BQZJOQXSCSZQPS-UHFFFAOYSA-N 0.000 claims description 4
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 4
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 4
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-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
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 102000008186 Collagen Human genes 0.000 claims description 2
- 108010035532 Collagen Proteins 0.000 claims description 2
- 108010010803 Gelatin Proteins 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- 244000028419 Styrax benzoin Species 0.000 claims description 2
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 2
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 2
- 229960002130 benzoin Drugs 0.000 claims description 2
- 229940045110 chitosan Drugs 0.000 claims description 2
- 229920001436 collagen Polymers 0.000 claims description 2
- ZFRKEVMBGBIBGT-UHFFFAOYSA-N ethenyl benzenesulfonate Chemical compound C=COS(=O)(=O)C1=CC=CC=C1 ZFRKEVMBGBIBGT-UHFFFAOYSA-N 0.000 claims description 2
- 229920000159 gelatin Polymers 0.000 claims description 2
- 239000008273 gelatin Substances 0.000 claims description 2
- 229940014259 gelatin Drugs 0.000 claims description 2
- 235000019322 gelatine Nutrition 0.000 claims description 2
- 235000011852 gelatine desserts Nutrition 0.000 claims description 2
- 235000019382 gum benzoic Nutrition 0.000 claims description 2
- 230000015784 hyperosmotic salinity response Effects 0.000 claims description 2
- 229940025902 konjac mannan Drugs 0.000 claims description 2
- 150000003272 mannan oligosaccharides Chemical class 0.000 claims description 2
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 2
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims description 2
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 2
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 claims 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims 2
- UFQDKRWQSFLPQY-UHFFFAOYSA-N 4,5-dihydro-1h-imidazol-3-ium;chloride Chemical compound Cl.C1CN=CN1 UFQDKRWQSFLPQY-UHFFFAOYSA-N 0.000 claims 1
- 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 1
- 125000005442 diisocyanate group Chemical group 0.000 claims 1
- 150000001451 organic peroxides Chemical class 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000001509 sodium citrate Substances 0.000 abstract description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 6
- 230000033558 biomineral tissue development Effects 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000017 hydrogel Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229920005603 alternating copolymer Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- RPOCFUQMSVZQLH-UHFFFAOYSA-N furan-2,5-dione;2-methylprop-1-ene Chemical compound CC(C)=C.O=C1OC(=O)C=C1 RPOCFUQMSVZQLH-UHFFFAOYSA-N 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
-
- 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
- C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/06—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a heterocyclic ring containing nitrogen
- C08F226/10—N-Vinyl-pyrrolidone
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
Abstract
The invention relates to the field of tertiary oil recovery in oil fields, and discloses a gel ball with temperature resistance and salt resistance for oil recovery and a preparation method thereof, wherein the preparation method specifically comprises the following steps: 1. preparing a solution A: dissolving a polymerization monomer, a cross-linking agent A, an initiator A and an initiator B in a wrapping agent to obtain a solution A; 2. preparing a solution B: dissolving a cross-linking agent B by using deionized water to obtain a solution B; 3. and (3) under the irradiation of an ultraviolet lamp, dripping the solution A into the solution B, continuing to irradiate after the dripping is finished, and filtering to obtain the gel spheres for oil extraction with temperature resistance and salt resistance. The gel spheres for oil extraction with temperature resistance and salt resistance have the particle size distribution range of 1-10 mm, the diameter expansion multiple of clear water is 0.5-5 times, the surface is smooth, and under the condition of adding sodium citrate, the expansion multiple of the viscoelastic gel spheres is increased, and the surface is in a viscous state. And the gel balls for oil extraction with various properties can be prepared by adjusting the formula so as to improve the practicability and the applicability of the method.
Description
Technical Field
The invention relates to the field of tertiary oil recovery in oil fields, in particular to a preparation method of a gel ball with temperature resistance and salt resistance for oil recovery.
Background
In tertiary oil recovery of oil fields, in order to block large pore passages, change the water drive flow direction and enlarge the swept volume, the large pore passages are often blocked by injecting particle substances, and the application effect of spherical products with regular shapes, expandability and variability is optimal. At present, products applied to the market are basically nano-micron emulsion products, microspheres have no viscosity, and spherical viscoelastic particles which are in millimeter level and submillimeter level, are particularly suitable for oil reservoir environments with the temperature of more than 120 ℃ and the mineralization degree of more than 18 ten thousand milligrams per liter do not exist, so that the application of the spherical viscoelastic particle products in oil field exploitation is limited.
Chinese patent CN107973942A discloses an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel and a preparation method thereof, and the hydrogel spheres prepared by the method have poor temperature resistance and far meet the application requirement of high-temperature oil reservoirs.
Chinese patent CN103736472A discloses a gel ball type color particle adsorbent, a preparation method and application thereof, wherein the main skeleton of the gel ball prepared by the method is sodium alginate, and the gel ball is very easy to hydrolyze at high temperature.
Chinese patent CN109464989A discloses a preparation method of sodium alginate gel beads. The gel ball prepared by the method is easy to dehydrate after being stored for a long time, loses elasticity after being soaked in high-temperature water, and gradually decomposes.
Therefore, how to develop a gel ball with temperature resistance and salt resistance for oil extraction is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a gel bead for oil extraction with temperature resistance and salt tolerance, which aims at solving the problems in the prior art.
When the viscoelastic gel spheres are prepared, firstly, the cross-linking agent B is used for forming ion exchange type primary cross-linked gel on the wrapping agent, and then, the initiator is used for polymerizing the polymerization monomer to form secondary cross-linked gel combined by covalent bonds, so that the product forms a secondary cross-linked product. The process method is simple and is suitable for preparing the gel ball plugging agent with the diameter of 1-10 mm and the temperature resistance and salt resistance for oil extraction.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the gel ball with the temperature resistance and salt resistance for oil extraction is obtained by reacting the following components in percentage by mass:
10 to 50 percent of polymerized monomer,
0.1 to 1 percent of cross-linking agent A,
1 to 5 percent of cross-linking agent B,
0.1 to 1 percent of initiator A,
0.01 to 0.1 percent of initiator B,
0.5 to 2 percent of wrapping agent,
50-80% of deionized water.
It should be noted that the concentrations of the above-mentioned materials are as follows:
the preferable concentration of the polymerization monomer is 10-50%, and the proper concentration is selected according to the actual application requirement, wherein the larger the concentration is, the larger the ball hardness and the elastic modulus of the prepared viscoelastic gel are, and the smaller the ball hardness and the elastic modulus are.
The concentration of the preferable cross-linking agent A is 0.1-1%, the concentration is too low, the cross-linking degree is not enough, and the product is weak and unstable; and the product has high hardness and is fragile due to excessive concentration.
The concentration of the cross-linking agent B is preferably 1-5%, and the concentration is too low, so that the forming difficulty in preparation easily causes content loss and reaction failure; and the concentration is too high, the cost is high, and the method is meaningless.
The concentration of the preferred initiator A is 0.1-1%, the concentration is too high, and the prepared product has small molecular weight; and the concentration is too low, the preparation process is slow, and the content is dissolved out, so that the reaction failure is easily caused.
The concentration of the preferred initiator B is 0.01-0.1%, the concentration is too high, the cost is high, and the molecular weight of the prepared product is small; and the concentration is too low, the preparation process is slow, and the content is dissolved out, so that the reaction failure is easily caused.
The preferable wrapping agent is 0.5-2%, the concentration is too high, the wrapping agent is not easy to dissolve, and the later-stage ingredients and use are influenced; and the concentration is too low, the wrapping force is not enough, and the dissolution of the inclusion is easy to cause.
In addition, the gel ball for oil extraction disclosed and protected by the invention has a double-skeleton structure, is excellent in temperature resistance and salt resistance, and is more suitable for oil extraction application in the field of oil fields.
Preferably, the polymerization monomer is at least one of acrylamide, acrylic acid, methacrylamide, methacrylic acid, 2-acrylamide-2-methylpropanesulfonate, vinylbenzene sulfonate, N, N-dimethylacrylamide and N-vinyl pyrrolidone.
Preferably, the crosslinking agent A is N, N-methylene bisacrylamide.
Preferably, the cross-linking agent B is calcium chloride or calcium lactate.
Preferably, the wrapping agent at least comprises one of sodium alginate, chitosan, gelatin, konjac mannan oligosaccharide and collagen.
Preferably, the initiator A at least comprises one of persulfate and benzoyl peroxide.
Preferably, the initiator B at least comprises one of azobisisobutyronitrile hydrochloride, benzoin dimethyl ether and benzoin methyl ether.
The invention also provides a preparation method of the gel ball with temperature resistance and salt resistance for oil extraction.
A preparation method of gel balls with temperature resistance and salt resistance for oil extraction comprises the following specific steps:
(1) preparing a solution A: dissolving a polymerization monomer, a cross-linking agent A, an initiator A and an initiator B in a wrapping agent solution to obtain a solution A for later use;
(2) preparing a solution B: dissolving the cross-linking agent B by using deionized water to obtain a solution B for later use;
(3) and (3) under the irradiation of an ultraviolet lamp, dripping the solution A into the solution B, stirring at normal temperature for reaction, continuing to irradiate for 5-10 min after finishing dripping, and filtering to obtain the gel spheres for oil extraction with temperature resistance and salt resistance.
Note: the proportion relationship among the reaction raw materials in the preparation method is calculated according to the following components in percentage by mass in the reaction system:
10 to 50 percent of polymerized monomer,
0.1 to 1 percent of cross-linking agent A,
1 to 5 percent of cross-linking agent B,
0.1 to 1 percent of initiator A,
0.01 to 0.1 percent of initiator B,
0.5 to 2 percent of wrapping agent,
50-80% of deionized water.
By adopting the technical scheme, the invention has the following beneficial effects:
when the viscoelastic gel ball is prepared, firstly, the cross-linking agent B is used for forming ion exchange type primary cross-linked gel for the wrapping agent, and then, the initiator is used for polymerizing the polymerization monomer under the ultraviolet illumination condition to form secondary cross-linked gel combined by covalent bonds, so that the product forms a secondary cross-linked product. The process method is simple and is suitable for preparing the gel ball plugging agent with the diameter of 1-10 mm for oil extraction. Compared with the existing production process, the invention uses the ultraviolet initiation process and adds the secondary covalent bond crosslinking, so that the product is not easy to dehydrate and has more excellent temperature resistance and salt resistance.
Exemplary, the most preferred preparation scheme of the present invention is:
(1) according to the mass percentage, the polymerization monomer accounting for 10 to 50 percent of the reaction system, the cross-linking agent A accounting for 0.1 to 1 percent,
1-5% of cross-linking agent B, 0.1-1% of initiator A, 0.01-0.1% of initiator B, 0.5-2% of wrapping agent and 50-80% of deionized water, and uniformly stirring at room temperature to obtain solution A;
(2) preparing a crosslinking agent B into a solution with the concentration of 1-5% by using deionized water to obtain a solution B;
(3) under the irradiation of an ultraviolet lamp, dripping the solution A into the solution B by using a dropper or a liquid dropper under the condition of stirring, after the dripping is finished, continuing to irradiate for 5-10 min, and turning off the ultraviolet lamp and the stirrer;
(4) and filtering the prepared sticky ball liquid by using a filter screen to obtain the finished product of the gel ball for oil extraction with temperature resistance and salt resistance.
According to the technical scheme, compared with the prior art, the gel ball for oil extraction with temperature resistance and salt resistance and the preparation method thereof have the following excellent technical effects:
1) the viscoelastic gel for oil extraction prepared by the method provided by the invention has the spherical particle diameter distribution range of 0.5-10 mm, the clear water diameter expansion multiple of 0.5-5 times and smooth surface, and the spherical expansion multiple of the viscoelastic gel is increased under the condition of adding sodium citrate, so that the surface is in a viscous state.
2) The gel balls for oil extraction with various properties and temperature and salt resistance can be prepared by adjusting the formula so as to improve the practicability and the applicability of the method. For example, the preparation method can be used for preparing temperature-resistant and salt-resistant viscoelastic gel balls which can resist the temperature of more than 120 ℃ and can be applied under the condition that the mineralization degree is 18 to 25 ten thousand milligrams per liter.
Detailed Description
The technical solutions disclosed and protected by the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a preparation method of a gel ball with temperature resistance and salt resistance for oil extraction.
The present invention will be further specifically illustrated by the following examples for better understanding, but the present invention should not be construed as being limited thereto, and the insubstantial modifications and variations of the present invention as shown in the above-described summary of the invention are considered to fall within the scope of the invention by those skilled in the art.
The technical solution of the present invention will be further described with reference to the following specific examples.
Example 1
A preparation method of gel balls with temperature resistance and salt resistance for oil extraction specifically comprises the following steps:
under stirring, dissolving 1g of sodium alginate in 100ml of deionized water, adding 40g of acrylamide, 0.3g of N, N-methylene bisacrylamide, 1.5g of ammonium persulfate and 0.1g of azobisisobutyrimidazoline hydrochloride after the sodium alginate is completely dissolved, and uniformly stirring at room temperature to obtain a solution A; weighing 3g of calcium chloride, and dissolving the calcium chloride by using 300ml of deionized water to obtain a solution B; starting a stirrer, adjusting the rotating speed to 300rpm, dripping the solution A into the solution B by using a dropper under the irradiation of an ultraviolet lamp, continuing to irradiate for 5min after finishing dripping, and closing the ultraviolet lamp and the stirrer; and filtering the prepared viscoelastic gel ball liquid by using a filter screen to obtain the gel ball with temperature resistance and salt resistance for oil extraction.
The gel ball for oil extraction prepared by the method has temperature resistance and salt resistance, and is suitable for oil reservoirs with stratum temperatures of less than 90 ℃.
Example 2
A preparation method of gel balls with temperature resistance and salt resistance for oil extraction specifically comprises the following steps:
under stirring, dissolving 1g of sodium alginate in 100ml of deionized water, adding 20g of acrylamide, 20g of N-vinylpyrrolidone, 0.5g of N, N-methylenebisacrylamide, 1.5g of potassium persulfate and 0.2g of benzoin methyl ether after the sodium alginate is completely dissolved, and uniformly stirring at room temperature to obtain a solution A; weighing 5g of calcium lactate, and dissolving the calcium lactate by using 300ml of deionized water to obtain a solution B; starting a stirrer, adjusting the rotating speed to 300rpm, dripping the solution A into the solution B by using a dropper under the irradiation of an ultraviolet lamp, after finishing dripping, irradiating for 5min, and closing the ultraviolet lamp and the stirrer; and filtering the prepared viscoelastic gel ball liquid by using a filter screen to obtain a finished product of the gel ball for oil extraction with temperature resistance and salt resistance.
The oil extraction gel ball prepared by the method has temperature resistance and salt resistance, and is suitable for oil reservoirs with the mineralization degree of more than 18 ten thousand milligrams per liter and the temperature of less than 150 ℃.
Example 3
A preparation method of gel balls with temperature resistance and salt resistance for oil extraction specifically comprises the following steps:
under stirring, 1g of chitosan is dissolved in 100ml of deionized water, after the chitosan is completely dissolved, 30g of acrylamide, 10g of 2-acrylamide-2-methylpropanesulfonate, 5g of sodium hydroxide, 1g of N, N-methylene bisacrylamide, 1.5g of ammonium persulfate and 0.1g of azobisisobutyrimidazoline hydrochloride are added, and the mixture is stirred uniformly at room temperature to obtain a solution A; weighing 3g of calcium lactate, and dissolving the calcium lactate in 300ml of deionized water to obtain a solution B; starting a stirrer, adjusting the rotating speed to 300rpm, dripping the solution A into the solution B by using a dropper under the irradiation of an ultraviolet lamp, continuing to irradiate for 5min after finishing dripping, and closing the ultraviolet lamp and the stirrer; and filtering the prepared viscoelastic gel ball liquid by using a filter screen to obtain a finished product of the gel ball for oil extraction with temperature resistance and salt resistance.
The gel spheres for oil extraction prepared by the method and having the temperature resistance and salt resistance are suitable for oil reservoirs with the stratum temperature of less than 90 ℃ and the mineralization degree of less than 2 ten thousand milligrams per liter.
Example 4
A preparation method of gel balls with temperature resistance and salt resistance for oil extraction specifically comprises the following steps:
under stirring, dissolving 0.6g of sodium alginate in 100ml of deionized water, adding 15g of acrylamide, 25g of N-vinyl pyrrolidone, 0.3g of N, N-methylene bisacrylamide, 1.5g of potassium persulfate and 0.1g of benzoin methyl ether after the sodium alginate is completely dissolved, and uniformly stirring at room temperature to obtain a solution A; weighing 6g of anhydrous calcium chloride, and dissolving the anhydrous calcium chloride by using 300ml of deionized water to obtain a solution B; starting a stirrer, adjusting the rotating speed to 300rpm, dripping the solution A into the solution B by using a dropper under the irradiation of an ultraviolet lamp, after finishing dripping, irradiating for 10min, and closing the ultraviolet lamp and the stirrer; and filtering the prepared viscoelastic gel ball liquid by using a filter screen to obtain a finished product of the gel ball for oil extraction with temperature resistance and salt resistance.
The oil extraction gel ball prepared by the method has temperature resistance and salt resistance, and is suitable for oil reservoirs with the mineralization degree of more than 18 ten thousand milligrams per liter and the temperature of less than 150 ℃.
Example 5
A preparation method of gel balls with temperature resistance and salt resistance for oil extraction specifically comprises the following steps:
under stirring, 0.5g of chitosan is dissolved in 100ml of deionized water, after all the sodium alginate is dissolved, 30g of acrylamide, 0.8g of N, N-methylene bisacrylamide, 1.5g of ammonium persulfate and 0.1g of azobisisobutyrimidazoline hydrochloride are added, and the mixture is stirred uniformly at room temperature to obtain solution A; weighing 5g of calcium lactate, and dissolving the calcium lactate by using 300ml of deionized water to obtain a solution B; starting a stirrer, adjusting the rotation speed to 300rpm, dripping the solution A into the solution B by using a dropper under the irradiation of an ultraviolet lamp, continuing to irradiate for 8min after finishing dripping, and closing the ultraviolet lamp and the stirrer; and filtering the prepared viscoelastic gel ball liquid by using a filter screen to obtain the gel ball with temperature resistance and salt resistance for oil extraction.
The gel ball for oil extraction prepared by the method has temperature resistance and salt resistance, and is suitable for oil reservoirs with stratum temperatures of less than 90 ℃.
The inventive content is not limited to the content of the above-mentioned embodiments, wherein combinations of one or several of the embodiments may also achieve the object of the invention.
To further verify the excellent effects of the present invention, the inventors also conducted the following experiments:
experiment 1:
the viscoelastic gel spheres prepared in example 2, which have an initial particle size of 3mm, were prepared into a solution using mineralized water of 18 and 25 ten thousand mg/l, the solution was poured into a stainless steel bucket, sealed, and the stainless steel bucket was placed in an oven at 120 ℃, samples were taken out at different times, respectively, and were allowed to stand at room temperature, and after filtration, the mass expansion factor was measured, and the data were as follows:
| in the presence of citric acid | 30 days | 60 days | 90 days | 120 days | 150 days | 180 days |
| Diameter expansion factor in clear water | 3 | 3 | 3 | 3 | 3 | 3 |
| Surface property(s) | Has adhesive surface | Has adhesive surface | Has adhesive surface | Has adhesive surface | Has adhesive surface | Has adhesive surface |
| In the absence of citric acid | 30 days | 60 days | 90 days | 120 days | 150 days | 180 days |
| 18×104Diameter at mg/L Expansion factor | 2 | 2 | 2 | 2 | 2 | 2 |
| 25×104Diameter at mg/L Expansion factor | 1.8 | 1.8 | 1.8 | 1.6 | 1.4 | 1.4 |
The analysis of the data shows that the diameter distribution range of the spherulites of the viscoelastic gel for oil extraction prepared by the method provided by the invention is 0.5-10 mm, the diameter expansion multiple of clear water is 0.5-5 times, the surface is smooth, and the spherical expansion multiple of the viscoelastic gel is increased under the condition of adding sodium citrate, so that the surface is in a viscous state.
And the gel balls for oil extraction with various properties can be prepared by adjusting the formula so as to improve the practicability and the applicability of the method. For example, the preparation method can be used for preparing temperature-resistant and salt-resistant viscoelastic gel balls which can resist the temperature of more than 120 ℃ and can be applied under the condition that the mineralization degree is 18 to 25 ten thousand milligrams per liter.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. The gel ball for oil extraction with temperature resistance and salt resistance is characterized by being obtained by reacting the following components in percentage by mass:
10 to 50 percent of polymerized monomer,
0.1 to 1 percent of cross-linking agent A,
1 to 5 percent of cross-linking agent B,
0.1 to 1 percent of initiator A,
0.01 to 0.1 percent of initiator B,
0.5 to 2 percent of wrapping agent,
50-80% of deionized water;
the polymerization monomer is at least one of acrylamide, acrylic acid, methacrylamide, methacrylic acid, 2-acrylamide-2-methylpropanesulfonate, vinylbenzene sulfonate, N, N-dimethylacrylamide and N-vinyl pyrrolidone;
the crosslinking agent A is N, N-methylene bisacrylamide, pentaerythritol triacrylate, diisocyanate or divinylbenzene;
the wrapping agent at least comprises one of sodium alginate, chitosan, gelatin, konjac mannan oligosaccharide and collagen;
the cross-linking agent B is calcium chloride or calcium lactate;
the initiator A at least comprises one of hydrogen peroxide, organic peroxide and persulfate;
the initiator B at least comprises one of azodiisobutyl imidazoline hydrochloride, benzoin dimethyl ether and benzoin methyl ether;
the method specifically comprises the following steps:
(1) preparing a solution A: dissolving a polymerization monomer, a cross-linking agent A, an initiator A and an initiator B in a wrapping agent to obtain a solution A for later use;
(2) preparing a solution B: dissolving the cross-linking agent B by using deionized water to obtain a solution B for later use;
(3) and (3) under the irradiation of an ultraviolet lamp, dripping the solution A into the solution B, stirring at normal temperature for reaction, continuing to irradiate for 5-10 min after finishing dripping, and filtering to obtain the gel spheres for oil extraction with temperature resistance and salt resistance.
2. The gel sphere with temperature resistance and salt tolerance for oil extraction of claim 1, wherein the concentration of the solution B is 1-5%.
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