CN115772306A - Temperature-resistant slow-release gel material and preparation method and application thereof - Google Patents
Temperature-resistant slow-release gel material and preparation method and application thereof Download PDFInfo
- Publication number
- CN115772306A CN115772306A CN202111051899.6A CN202111051899A CN115772306A CN 115772306 A CN115772306 A CN 115772306A CN 202111051899 A CN202111051899 A CN 202111051899A CN 115772306 A CN115772306 A CN 115772306A
- Authority
- CN
- China
- Prior art keywords
- surfactant
- temperature
- gel material
- alkyl
- polyvinyl alcohol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000000463 material Substances 0.000 title claims abstract description 114
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000004094 surface-active agent Substances 0.000 claims abstract description 74
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 71
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229920000642 polymer Polymers 0.000 claims abstract description 42
- 239000002131 composite material Substances 0.000 claims abstract description 27
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 14
- 150000001408 amides Chemical class 0.000 claims abstract description 13
- 229920000098 polyolefin Polymers 0.000 claims abstract description 13
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- 238000000034 method Methods 0.000 claims description 36
- 238000006116 polymerization reaction Methods 0.000 claims description 30
- 125000000217 alkyl group Chemical group 0.000 claims description 29
- -1 sodium alkyl sulfate Chemical class 0.000 claims description 28
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- 238000004132 cross linking Methods 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 24
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 23
- 239000002202 Polyethylene glycol Substances 0.000 claims description 22
- 229920001223 polyethylene glycol Polymers 0.000 claims description 22
- 239000003999 initiator Substances 0.000 claims description 18
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- 230000008569 process Effects 0.000 claims description 18
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- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000006136 alcoholysis reaction Methods 0.000 claims description 12
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 11
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 9
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 9
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 9
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- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 7
- 239000003945 anionic surfactant Substances 0.000 claims description 7
- 229960003237 betaine Drugs 0.000 claims description 7
- 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 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
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- 239000002280 amphoteric surfactant Substances 0.000 claims description 6
- 239000003093 cationic surfactant Substances 0.000 claims description 6
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 6
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 6
- 239000002736 nonionic surfactant Substances 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 6
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- CGRRTNMGLUWMLJ-UHFFFAOYSA-N 2-phenyl-2-(prop-2-enoylamino)ethanesulfonic acid Chemical compound C=CC(=O)NC(CS(=O)(=O)O)C1=CC=CC=C1 CGRRTNMGLUWMLJ-UHFFFAOYSA-N 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
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- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical compound C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 claims description 3
- 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 3
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 3
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 3
- 150000008052 alkyl sulfonates Chemical class 0.000 claims description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
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- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims description 3
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 3
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- 235000010344 sodium nitrate Nutrition 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 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
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- XOAAWQZATWQOTB-UHFFFAOYSA-N taurine Chemical compound NCCS(O)(=O)=O XOAAWQZATWQOTB-UHFFFAOYSA-N 0.000 claims description 3
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- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical group OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 2
- IXOCGRPBILEGOX-UHFFFAOYSA-N 3-[3-(dodecanoylamino)propyl-dimethylazaniumyl]-2-hydroxypropane-1-sulfonate Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC(O)CS([O-])(=O)=O IXOCGRPBILEGOX-UHFFFAOYSA-N 0.000 claims 2
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Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Abstract
The invention relates to a solid gel material, in particular to a temperature-resistant slow-release gel material and a preparation method and application thereof, wherein the gel material contains 1-60 wt% of surfactant, 1.1-40 wt% of composite temperature-resistant polymer and 0-97.9 wt% of water, based on the total amount of the gel material; wherein the composite temperature-resistant polymer comprises cross-linked polyvinyl alcohol with a structure shown in a formula (1) and polyolefin amide sulfonic acid polymer with a structure shown in a formula (2);
wherein X is selected from amido-2-methylpropyl or amido-2-phenylethyl; m is 1500-3000, n is 500-1000. The gel material has good temperature resistance and stable active component release, can be used for high-temperature oil and gas wells, and reduces the addition of chemical agents when the wells are opened frequently.
Description
Technical Field
The invention relates to a solid gel material, in particular to a temperature-resistant slow-release gel material and a preparation method and application thereof.
Background
During oil and gas production, different chemical agents such as cleaning agents, corrosion inhibitors, paraffin inhibitors, antiscaling agents, foaming agents and the like are required to be added into a shaft to ensure the well to be perfect and smooth and increase the yield of oil and gas. In natural gas production, as the production time increases, the underground pressure decreases, underground water accumulates in the shaft, so that the natural gas production is reduced and even stopped, and the surfactant can be used as a cleaning agent, a corrosion inhibitor and a foaming agent, wherein bubbles generated as the foaming agent are discharged from the shaft base fluid. These wellbore chemical blowing agents can be in solid or liquid form. Solid chemicals are usually made into rods, and are regularly put into a shaft by frequently opening a well, and liquid is injected into the well by a pump, so that additional pipelines and pumps are needed for investment. Solid slow release chemicals are an effective way to reduce well opening and equipment investment.
The slow release technology is applied to the fields of agriculture, medicines, oilfield chemicals and the like. For example, in the field of medicine, the medicine sustained-release capsule is prepared by adopting a coating method, so that the administration frequency is reduced, and the effective time is prolonged by 2 times. In the direction of pesticide slow-release agent, there are many varieties of microcapsule, and the capsule shell can be natural, semisynthetic or fully synthetic high-molecular compound, including protein, high-molecular carbohydrate, cellulose, fatty acid and its derivative, inorganic high-molecular, vinyl polymer, polyamide, polyurethane and polyester, etc. In the aspect of slow release fertilizers, modified polyvinyl alcohol is respectively mixed with inorganic materials of diatomite, zeolite powder, biomass charcoal, ground phosphate rock and sulfur to be used as coating materials of controlled release fertilizers, so that the loss of nitrogen is reduced, and the utilization rate of nitrogen fertilizers is improved.
Sustained release technology has found numerous applications in oil fields, particularly in the field of corrosion inhibitors, such as sustained release solid corrosion and scale inhibitors used in Dongxi oil fields. The existing slow release technology is continuously expanded to other directions in the field of oil fields, such as drilling well cementing cement slurry and the like, the document reports that a slow release salt inhibitor and the like are prepared by adopting a method of combining epoxy resin and starch, and a microcapsule wrapping technology wraps a cement accelerator to delay the release rate of the cement accelerator so as to improve the thickening performance of a cement system and the like.
US9976070B2 discloses the use of a porous oxidic metal such as alumina, zirconia, titania as a solid support mixed with a binder, and the compacted granules of shape formed from a composite of a good treating agent adsorbed on the calcined porous metal oxide or into the interstices of the calcined porous metal oxide can be introduced into a production well or gas producing well to slowly release the active ingredient adsorbed in the porous material. US20180134939A1 discloses that active substances of a scale inhibitor and a slow release agent are crosslinked on a carrier through chemical bonds, and the active substances are slowly released by hydrolyzing the crosslinking bonds under the well by utilizing the reaction crosslinking of alcohol, amine and acid. US20170058184A1 discloses a water insoluble carrier composed of corn grit, which is used as a scale inhibitor, a surfactant and other liquid chemical reagents for adsorption in the production increasing or producing process of oil and gas fields, and utilizes the pressure resistance and liquid insolubility of the corn grit to slowly release active chemical substances into oil and gas wells, thereby achieving the purpose of slow release. US20120273197A1 discloses a composite material for well treatment operations such as hydraulic fracturing, sand control, etc., which allows for the slow release of one or more well treatment agents into subterranean formations and/or wellbores penetrating the formations, having a nano-sized calcined porous matrix (sorbent) of high specific surface area, onto which the well treatment agent is coated. CN110157401A discloses a preparation method of a controllable long-acting slow-release scale inhibitor capsule, which is characterized in that a scale inhibitor and an inorganic nano carrier which is one of slow-release components are assembled into a homogeneous whole in the form of solid solution, a layer of controllably soluble cross-linked polymer which is composed of carboxymethyl cellulose, polyvinyl alcohol, porous zeolite and the like is coated outside the homogeneous whole, when the polymer is dissolved in an environmental medium, active substances are gradually released, and the slow release in a shaft is realized by utilizing a dual controlled release mechanism of polymer dissolution and scale inhibitor desorption from the inorganic nano carrier, so that the protection effect on the shaft is prolonged. CN107304078A discloses an environment-friendly slow-release polymer scale inhibitor, which is prepared by mixing polyvinyl alcohol, sodium alginate and gelatin solution as carrier material, and boric acid as additive to construct a slow-release wall material system to load the scale inhibitor, and slowly release the scale inhibitor in simulated oil field water medium at 50 ℃.
Although the slow release technology is gradually used in the exploitation process of oil fields and gas fields, the requirements on slow release materials are extremely strict due to the complexity of the environmental characteristics of high temperature wells. CN110564388A discloses a preparation method of a temperature-sensitive leaking stoppage colloid for oil and gas fields, which is characterized in that modified polyacrylamide, a trivalent cross-linking agent, a water-soluble slow-release agent and a water phase are subjected to multi-phase physical adsorption and chemical pre-crosslinking, so that the temperature-sensitive leaking stoppage colloid has the delayed slow-release characteristic of temperature-sensitive swelling, but the applicable temperature is only 60-90 ℃. In CN110003875B, a research on a slow release type foaming agent is carried out, a surfactant foaming agent is mixed with 5-20% of casing to enable the action time to reach 120 hours (5 days), but the use temperature of the technology is lower than 90 ℃, and the defects that the storage period of animal materials is shorter than 3 months, the batch quality is inconsistent and the like exist. In these studies, the selection of a slow-release material for specific conditions (e.g., acid resistance, temperature resistance) remains a difficult point of research.
In a word, the slow release material in the prior art mostly uses a slowly-soluble polymer material (such as an enteric coating) to wrap a surfactant, so that the slow release effect is realized; but once the high molecular material is dissolved, the surfactant can be quickly released, the slow release action time is short, and the temperature resistance is low.
Disclosure of Invention
The invention aims to overcome the defects of short slow release action time and low temperature resistance of a slow release material in the prior art, and provides a temperature-resistant slow release gel material, a preparation method and application thereof.
The inventor of the invention finds that active ingredients (such as surfactant) are introduced into the gel material as a slow-release material, the gel material can be better suitable for high-temperature oil and gas wells, the preparation method is simple and easy to operate, but the problem to be solved is how to uniformly disperse the active ingredients while ensuring the gel forming performance and how to improve the slow-release action time and the temperature resistance. The inventor further researches and discovers that polyvinyl alcohol is selected as one of the raw materials of the gel material, so that the polyvinyl alcohol and the water-soluble temperature-resistant monomer are subjected to cross-linking polymerization reaction, and meanwhile, the active ingredients can be uniformly dispersed in the gel material by matching with the specific content of each raw material and the synergistic effect, so that the gel material with the slow release property and the temperature resistance is formed, and the gel material has the acid resistance and the salt resistance. The invention realizes that the gel material is coated with the surfactant (such as the foaming agent), can be used for drainage and gas production of high-temperature gas wells, and solves the problem of frequent well opening and foam discharging agent filling. Other materials that can form gel materials, such as cross-linked polyacrylic acid polymers, have poor temperature resistance, poor salt resistance, poor compatibility with surfactants, and the like.
In order to achieve the above object, a first aspect of the present invention provides a temperature-resistant slow-release gel material, which comprises 1-60 wt% of a surfactant, 1.1-40 wt% of a composite temperature-resistant polymer, and 0-97.9 wt% of water, based on the total amount of the gel material; wherein the composite temperature-resistant polymer comprises cross-linked polyvinyl alcohol with a structure shown in a formula (1) and polyolefin amide sulfonic acid polymer with a structure shown in a formula (2);
wherein X is selected from amido-2-methylpropyl or amido-2-phenylethyl; m is 1500-3000, n is 500-1000.
Preferably, the gel material further comprises polyethylene glycol and optionally an inorganic salt.
The second aspect of the invention provides a preparation method of a temperature-resistant slow-release gel material, which comprises the following steps: mixing a surfactant, polyvinyl alcohol, a temperature-resistant monomer and water, carrying out cross-linking polymerization reaction, and then optionally standing to obtain a temperature-resistant slow-release gel material; wherein, based on the total consumption of the raw materials, the consumption of the surfactant is 1-60 wt%, the consumption of the polyvinyl alcohol is 1-30 wt%, the consumption of the temperature-resistant monomer is 0.1-10 wt%, and the consumption of the water is 0-97.9 wt%; the temperature-resistant monomer has a structure shown in a formula (3);
wherein X is selected from amido-2-methylpropyl or amido-2-phenylethyl.
In a third aspect, the invention provides a temperature-resistant slow-release gel material prepared by the preparation method of the second aspect.
In a fourth aspect, the invention provides the use of the temperature-resistant slow-release gel material of the first or third aspect as an effervescent agent.
The temperature-resistant slow-release gel material provided by the invention contains crosslinked polyvinyl alcohol and polyolefin amide sulfonic acid polymers, the two polymers are mutually interpenetrated and mixed to form a composite temperature-resistant polymer, and a surfactant is coated, so that the temperature-resistant slow-release gel material has good temperature resistance, has good slow release performance and stable release of active ingredients, can slowly release the active ingredient, namely the surfactant, in a shaft high-temperature environment, can be used as a cleaning agent, a foaming agent or a corrosion inhibitor, and can be applied to the fields of oil and gas shaft cleaning, foaming drainage, corrosion inhibitors and the like.
Further, in the preferred scheme of the invention, the polyethylene glycol and the optional inorganic salt are particularly introduced, so that the coating amount of the surfactant in the gel material can be increased, the slow-release action time is further prolonged, and the high temperature resistance is ensured.
The preparation method provided by the invention can be used for preparing the temperature-resistant slow-release gel material with the specific composition, and the specific raw materials are matched with appropriate content and are cooperated with each other, so that a semi-interpenetrating three-dimensional network structure can be formed, and meanwhile, the surfactant is uniformly dispersed, and the gel material with slow release property and temperature resistance is formed.
Drawings
FIG. 1 is an SEM micrograph of a gel material prepared according to example 1 of the present invention after freeze-drying.
FIG. 2 is a photograph of a gel material prepared in example 1 of the present invention taken in water.
FIG. 3 is an IR spectrum of the gel material prepared in example 1 of the present invention and other samples.
FIG. 4 is a schematic diagram of the interpenetrating network structure of the gel material prepared in example 1 of the present invention.
FIG. 5 is a TGA graph of a sample of PVA with gel material made according to example 1 of the present invention.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a temperature-resistant slow-release gel material, which contains 1-60 wt% of surfactant, 1.1-40 wt% of composite temperature-resistant polymer and 0-97.9 wt% of water, based on the total amount of the gel material; the composite temperature-resistant polymer comprises cross-linked polyvinyl alcohol with a structure shown in a formula (1) and a polyolefin amide sulfonic acid polymer with a structure shown in a formula (2);
wherein X is selected from amido-2-methylpropyl or amido-2-phenylethyl; m is 1500-3000, n is 500-1000.
In the gel material, the surfactant, the composite temperature-resistant polymer and the specific content thereof are synergistic, so that the surfactant can be uniformly dispersed and coated by gel, and the surfactant can be slowly released at high temperature (for example, 130 ℃) during application.
Preferably, based on the total amount of the gel material, the content of the surfactant is 1-50 wt%, the content of the composite temperature-resistant polymer is 1.25-25 wt%, and the content of the water is 25-97.75 wt%. The preferred scheme is more beneficial to uniform coating of the surfactant while ensuring the formation of gel.
In the present invention, preferably, in the formula (1), m is 1700 to 2500.
Preferably, in formula (2), n is 500 to 1000.
According to the present invention, preferably, the crosslinked polyethylene has an alcoholysis degree of from 78 to 99%.
Preferably, the content of the crosslinked polyvinyl alcohol is 80-97 wt% and the content of the polyolefin amide sulfonic acid polymer is 3-20 wt% based on the total amount of the composite temperature-resistant polymer.
More preferably, based on the total amount of the composite temperature-resistant polymer, the content of the crosslinked polyvinyl alcohol is 80-90 wt%, and the content of the polyolefin amide sulfonic acid polymer is 10-20 wt%.
In the invention, the composite temperature-resistant polymer with the specific alcoholysis degree and/or polymerization degree is adopted, so that the uniformity of the gel material is facilitated.
In the present invention, the kind of the surfactant can be selected by those skilled in the art according to the application requirements (such as cleaning agent, foaming agent and corrosion inhibitor), and the surfactant can be a single surfactant or a compound mixed surfactant.
According to the present invention, preferably, the surfactant is at least one of an anionic surfactant, a cationic surfactant, a nonionic surfactant and an amphoteric surfactant, and may be used in the present invention.
More preferably, the alkyl chain length of the surfactant is from 8 to 18. In the present invention, the alkyl chain length refers to the length of the alkyl main chain. It is understood that the alkyl backbone may be connected with or without a branch, and the present invention is not limited to the branch, and for example, the branch may be an alkyl branch, and those skilled in the art can freely select the branch as long as the temperature resistance and slow release performance of the gel material are improved.
In a preferred embodiment, the anionic surfactant includes at least one of sodium alkyl sulfate, sodium alkyl sulfonate, sodium alkyl benzene sulfonate, and sodium alkyl taurate, and specifically, for example, when the alkyl chain length is 12, the anionic surfactant may be at least one of Sodium Dodecyl Benzene Sulfonate (SDBS), sodium dodecyl sulfonate, and sodium dodecyl sulfate.
In a preferred embodiment, the cationic surfactant comprises an alkyl amine chloride, more preferably an alkyl trimethyl amine chloride and/or an alkyl imidazoline amine chloride.
In a preferred embodiment, the nonionic surfactant comprises polyoxyethylene and/or an alkyl glycoside.
More preferably, the polyoxyethylene is at least one of alkyl polyoxyethylene ether, alkylamine polyoxyethylene ether and castor oil polyoxyethylene ether.
More preferably, the degree of polymerization of the polyoxyethylene is 4 to 10.
In a preferred embodiment, the amphoteric surfactant comprises an alkyl amine oxide and/or an alkyl betaine, more preferably at least one of an alkyl amidopropyl amine oxide, an alkyl amidopropyl betaine, and an alkyl hydroxypropyl sulfobetaine.
According to a preferred embodiment of the present invention, the surfactant is at least one of sodium alkyl benzene sulfonate, sodium alkyl sulfonate, alkylamidopropyl betaine, and alkylhydroxypropylsulfobetaine, more preferably at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, cocamidopropyl betaine, and cocahydroxypropylsulfobetaine. Under the preferable scheme, the surfactant is more favorably and uniformly dispersed in the gel material, and the slow-release action time of the temperature-resistant slow-release gel material is longer.
According to a particularly preferred embodiment of the invention, the gel material further comprises an initiator.
The initiator content can be selected within wide limits according to the invention, and is preferably from 0.1 to 3% by weight, based on the total amount of the gel material.
In the present invention, the initiator is not limited as long as it can initiate polymerization and crosslinking reactions to synthesize the composite temperature-resistant polymer when the gel material is prepared. Preferably, the initiator is a free radical initiator, preferably comprising at least one of persulfate, benzoyl peroxide and azobisisobutyronitrile, more preferably at least one of ammonium persulfate, sodium persulfate and potassium persulfate.
According to the invention, the gel material may also contain a solubilizer for increasing the surfactant content. In a particularly preferred embodiment, the gel material further comprises polyethylene glycol and optionally an inorganic salt. Under the preferable scheme, polyethylene glycol is added to further increase the coating amount of the surfactant, and the gel is ensured to be uniform and not to be locally layered; the addition of inorganic salts further increases the density of the active ingredient in the gel material.
Preferably, the polyethylene glycol is present in an amount of from 0.5 to 10 wt%, more preferably from 2 to 8 wt%, based on the total amount of the gel material; the content of the inorganic salt is 0 to 20% by weight, more preferably 2 to 10% by weight.
In the present invention, the polyethylene glycol preferably has a weight average molecular weight of 2000 to 10000, more preferably 4000 to 6000.
In the present invention, the inclusion of the inorganic salt can further increase the coating density of the surfactant. The inorganic salt may preferably be at least one of water-soluble salts of sodium, potassium, aluminum and alkali thereof, and more preferably, the inorganic salt is selected from at least one of sodium sulfate, sodium nitrate, potassium sulfate, potassium nitrate and aluminum hydroxide.
The second aspect of the invention provides a preparation method of a temperature-resistant slow-release gel material, which comprises the following steps: mixing a surfactant, polyvinyl alcohol, a temperature-resistant monomer and water, carrying out cross-linking polymerization reaction, and then optionally standing to obtain a temperature-resistant slow-release gel material; wherein, based on the total consumption of the raw materials, the consumption of the surfactant is 1-60 wt%, the consumption of the polyvinyl alcohol is 1-30 wt%, the consumption of the temperature-resistant monomer is 0.1-10 wt%, and the consumption of the water is 0-97.9 wt%; the temperature-resistant monomer has a structure shown in a formula (3);
in the method of the present invention, the selectable range of X is the same as X in the first aspect, and is not described herein again.
In the method, polyvinyl alcohol and a temperature-resistant monomer are crosslinked, and a surfactant is coated at the same time to form the reticular composite hydrogel (namely the temperature-resistant slow-release gel material), and the hydrogel has good temperature resistance, can slowly release the surfactant and has long slow-release action time. The components of the raw materials are matched with specific contents, so that the surfactant can be coated while gel is formed, and the prepared gel material has temperature resistance and slow release property. Under the same conditions, when the content of each raw material is not appropriate, gel may not be formed, or the content of the coating surfactant is small, delamination occurs, or the release time is short.
In the present invention, it is understood that each raw material is completely converted into a gel material.
In the present invention, the selection range of the surfactant is as described above, and is not described herein again.
According to the invention, the temperature-resistant monomer is a monomer with thermal stability and water solubility, the thermal stability can be adaptively selected according to application requirements, and in a specific preferred embodiment, the temperature-resistant monomer is 2-acrylamido-2-methylpropanesulfonic acid and/or 2-acrylamido-2-phenylethanesulfonic acid.
According to the invention, the alcoholysis degree and the polymerization degree of the polyvinyl alcohol can be selected in a wide range, and the alcoholysis degree of the polyvinyl alcohol is preferably 88-99%. Preferably, the degree of polymerization of the polyvinyl alcohol is 1500 to 3000, more preferably 1700 to 2500. By adopting the preferred scheme of the invention, the gelling performance is more favorable, and the prepared gel material is more uniform. Polyvinyl alcohol which does not satisfy the above-mentioned specific alcoholysis degree and polymerization degree has relatively poor gelling property.
Preferably, based on the total amount of the raw materials, the amount of the surfactant is 1-50 wt%, the amount of the polyvinyl alcohol is 1-20 wt%, the amount of the temperature-resistant monomer is 0.25-5 wt%, and the amount of the water is 25-97.75 wt%. This preferred embodiment further facilitates uniform dispersion of the surfactant.
In a preferred embodiment, the amount of surfactant is 10 to 50 wt.%, the amount of polyvinyl alcohol is 10 to 20 wt.%, the amount of temperature-resistant monomer is 1 to 5 wt.%, and the amount of water is 25 to 79 wt.%, based on the total amount of the respective raw materials.
In the invention, the condition of the cross-linking polymerization reaction can realize that polyvinyl alcohol and a temperature-resistant monomer are cross-linked; preferably, the conditions of the cross-linking polymerization reaction include: the temperature is 70-99 deg.C, preferably 80-95 deg.C, more preferably 80-90 deg.C, and the time is 1-5h, preferably 2-4h.
In a particularly preferred embodiment, the cross-linking polymerization is carried out under stirring, preferably at a speed of 100 to 200rpm.
In the present invention, if a gel material can be produced during the crosslinking polymerization reaction, the standing may be omitted or may be performed, and it is preferable that the heating and stirring are stopped and the standing is performed after the crosslinking polymerization reaction. Further preferably, the standing is performed under sealed conditions. Under this preferred embodiment, gel formation is further facilitated.
Preferably, the standing time is 12-24h.
In a preferred embodiment of the present invention, the method further comprises: an initiator is introduced to effect said mixing. In the present invention, the selection range of the initiator is as described above, and is not described herein again.
Preferably, the initiator is used in an amount of 0.1 to 3% by weight, based on the total amount of the respective raw materials.
In a preferred embodiment of the present invention, the method further comprises: the mixing is carried out by introducing polyethylene glycol and optionally an inorganic salt. With this preferred embodiment, the gel is more uniform and no local delamination occurs.
Preferably, the polyethylene glycol is used in an amount of 0.5 to 10 wt%, more preferably 2 to 8 wt%, based on the total amount of each raw material; the inorganic salt is used in an amount of 0 to 20% by weight, more preferably 2 to 10% by weight. The preferable scheme of the invention can further increase the dosage of the surfactant.
In the present invention, the molecular weight of the polyethylene glycol is as described above, and is not described herein.
In the present invention, the inorganic salt may be introduced or may not be introduced. The selection range of the inorganic salt is as described above, and is not described in detail herein.
In the present invention, the mixing process is not limited as long as the raw materials can be uniformly mixed and the temperature-resistant sustained-release gel material can be prepared by the above method. Preferably, the process of mixing comprises:
a) Dividing water into part of water C and part of water D, and carrying out first mixing on a surfactant, an optional initiator and the part of water C to prepare a surfactant mixed solution;
b) Secondly, polyvinyl alcohol, a temperature-resistant monomer, optional polyethylene glycol, optional inorganic salt and part of water D are mixed to prepare polyvinyl alcohol mixed solution;
c) And thirdly mixing the polyvinyl alcohol mixed solution and the surfactant mixed solution, and heating to the temperature of the cross-linking polymerization reaction. The preferred scheme enables the surfactant to be more uniformly dispersed in the gel material, and further improves the time of slow release action.
In the present invention, the ratio of the amounts of the part of water C and the part of water D is not limited as long as the raw materials dissolved correspondingly can be dissolved. Preferably, the portion C of water represents 30 to 50% by weight of the total amount of water.
More preferably, the process of mixing further comprises: in the step a), after the first mixing, the temperature is raised to 40-60 ℃ to prepare the surfactant mixed solution. The preferred scheme is more beneficial to the faster dissolution and mixing of the components. In the present invention, the heating mode can be freely selected by those skilled in the art, and preferably the heating mode is realized by a water bath heating mode.
The process of the first mixing is not limited by the present invention, and further preferably, in step a), the process of the first mixing includes: the surfactant is first mixed with the optional initiator and then with part of the water C. This preferred embodiment further facilitates dispersion of the surfactant.
More preferably, the process of mixing further comprises: in the step b), after the second mixing, pre-standing for 1-3h, and pre-heating to 70-80 ℃ in sequence to prepare the polyvinyl alcohol mixed solution. The preferred scheme is more beneficial to the faster dissolution and more uniform mixing of the components. In the present invention, the preheating mode can be freely selected by those skilled in the art, and preferably the preheating mode is realized by a water bath heating mode.
The process of the second mixing is not limited by the present invention, and further preferably, in step b), the process of the second mixing includes: firstly, polyvinyl alcohol is mixed with temperature-resistant monomers, optional polyethylene glycol and optional inorganic salt, and then is mixed with part of water D. The preferable scheme is more beneficial to the dispersion and uniform mixing of all the components, thereby being more beneficial to the dissolution aiding of the surfactant and being more beneficial to the promotion of the cross-linking polymerization reaction of the polyvinyl alcohol.
In the present invention, there is no limitation on the manner of the third mixing in step c), and preferably, the third mixing process includes: the surfactant mixed solution is added into the polyvinyl alcohol mixed solution, so that the dispersion of the surfactant is facilitated.
In a third aspect, the invention provides a temperature-resistant slow-release gel material prepared by the preparation method of the second aspect. In the invention, the prepared temperature-resistant slow-release gel material has the composition and the performance of the gel material of the first aspect, and is not described in detail herein.
The temperature-resistant slow-release gel material provided by the invention can slowly release an active substance, namely a surfactant under the conditions of high temperature (for example, 80-150 ℃) and acidity (for example, pH value of 5) of a shaft, and can be used as a cleaning agent, a foaming agent or a corrosion inhibitor and the like.
In a fourth aspect, the invention provides the use of the temperature-resistant slow-release gel material of the first or third aspect as an effervescent agent.
The foaming agent is carried in the temperature-resistant slow-release gel material, so that the problem of frequent well opening and foam discharging agent filling can be solved for water discharging and gas production of high-temperature gas wells.
The present invention will be described in detail below by way of examples.
In the following examples, the content and polymerization degree of the crosslinked polyvinyl alcohol and the polyolefin amide sulfonic acid polymer in the obtained gel material were measured by gel chromatography.
The alcoholysis degree of the crosslinked polyvinyl alcohol was measured by the method for measuring residual acetate (or alcoholysis degree) of the polyvinyl alcohol resin of GB 12010.5-89.
Example 1
1. Sodium dodecyl benzene sulfonate powder (SDBS content 90 wt%) and ammonium persulfate are dissolved by adding 40wt% of water, and the temperature is raised to 50 ℃ in water bath to prepare a surfactant mixed solution.
2. Mixing polyvinyl alcohol (PVA, 1799 type, alcoholysis degree of 99%, polymerization degree m of 1700), 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), polyethylene glycol (weight average molecular weight 6000) and optional inorganic salt according to the proportion in the table 1, adding the mixture into the rest water, standing for 2 hours at normal temperature, stirring in a water bath, and heating to 80 ℃ to form polyvinyl alcohol mixed solution.
3. And then slowly adding the surfactant mixed solution into the polyvinyl alcohol mixed solution, stirring and heating to 95 ℃, controlling the temperature to continuously stir for 1 hour, wherein the stirring speed is 100rpm, stopping heating and stirring after all the raw materials are completely dissolved, and sealing and standing for 24 hours to form the slow-release composite hydrogel (namely the temperature-resistant slow-release gel material, PVA/AMPS). The contents, polymerization degrees, and alcoholysis degrees of the crosslinked polyvinyl alcohol and the polyolefin amide sulfonic acid polymer in the obtained gel material are shown in Table 1.
The Scanning Electron Micrograph (SEM) of the resulting gel material is shown in FIG. 1. As can be seen from FIG. 1, it is a homogeneous mixture. The picture of the resulting gel material in water is shown in fig. 2, and it can be seen that the product is a block-like gel.
The freeze-dried samples were tested by infrared spectroscopy and were SDBS, AMPS, PVA Hydrogel (i.e., a polyvinyl alcohol Hydrogel prepared according to the above method without the introduction of AMPS) and PVA/AMPS (i.e., a Hydrogel containing polyvinyl alcohol and a polyolefin amide sulfonic acid polymer), respectively, and the results are shown in FIG. 3FIG. 3 shows the spectrum at 3445cm in PVA/AMPS -1 The vibration peak of O-H, 1552cm -1 A peak of an N-H group, 1188-1034cm -1 The symmetric and asymmetric stretching vibration peak of sulfonic acid group-S = O appears, and the characteristic absorption peak of R-C = C of AMPS does not appear (1614 cm) -1 ) (i.e., the characteristic absorption peak disappears in the PVA/AMPS hydrogel), indicating that the monomer polymerizes to produce a complex-an interpenetrating mixture of two polymers (which is shown in FIG. 4). That is, it was revealed that the obtained gel material had a composite polymer having the structure represented by the foregoing formula (1) and formula (2).
Example 2
The process is carried out according to the method of example 1, except that the polyvinyl alcohol and the polyethylene glycol are different, and the dosage of each raw material is different, specifically, the polyvinyl alcohol is 1788 type, the alcoholysis degree is 88%, the polymerization degree is 1700, and the weight average molecular weight of the polyethylene glycol is 4000; and the reaction temperature in step 3 was 85 ℃ instead of 95 ℃ in example 1.
The SEM image of the resulting gel material indicated that it was a homogeneous mixture. The IR spectrum of the gel material obtained was similar to that of example 1, indicating that polymeric crosslinking had occurred.
Example 3
The procedure is as in example 1, except that the temperature-resistant monomer is 2-acrylamido-2-phenylethanesulfonic acid, and the reaction temperature in step 3 is 90 ℃ instead of 95 ℃ as in example 1; the rest is the same as example 1.
The SEM image of the resulting gel material indicated that it was a homogeneous mixture. The infrared spectrum of the obtained gel material shows that polymerization crosslinking (specifically, crosslinking among polyvinyl alcohol molecules and polymerization of styrene sulfonic acid) occurs.
Example 4
The process is carried out as in example 2, except that, according to the raw materials and the amounts thereof shown in Table 1, sodium sulfate, which is an inorganic salt, is particularly used, and the temperature-resistant monomer is 2-acrylamido-2-phenylethanesulfonic acid; the rest is the same as example 2.
The SEM image of the resulting gel material indicated it to be a homogeneous blend. The infrared spectrogram of the obtained gel material shows that polymerization crosslinking (specifically, crosslinking occurs among polyvinyl alcohol molecules, and 2-acrylamide-2-phenyl ethanesulfonic acid is polymerized).
Example 5
The procedure was as in example 1, except that the amounts of the respective raw materials shown in Table 1 were used; and the surfactant used was cocamidopropyl betaine (CAB), the other was the same as in example 1.
The SEM image of the resulting gel material indicated it to be a homogeneous blend. The IR spectrum of the gel material obtained was similar to that of example 1, indicating that polymeric crosslinking had occurred.
Examples 6 to 8
The procedure was as in example 1, except that the amounts of the respective raw materials shown in Table 1 were used.
The SEM image of the resulting gel material indicated it to be a homogeneous blend. The IR spectrum of the gel material obtained was similar to that of example 1, indicating that polymeric crosslinking had occurred.
Comparative example 1
The procedure was as in example 1, except that the amounts of the respective raw materials shown in Table 1 were used. The gel of example 1 was formed under this protocol.
The SEM image of the resulting gel material indicated that it was a homogeneous mixture. The IR spectrum of the gel material obtained was similar to that of example 1, indicating that polymeric crosslinking had occurred.
TABLE 1
Wherein, the amounts of the crosslinked polyvinyl alcohol and the polyolefin amide sulfonic acid polymers are all based on the total amount of the composite temperature-resistant polymer.
Test example
The gel materials prepared in the above examples and comparative examples were tested for their release rate in water.
Adopts simulated underground water, and comprises the following components: 8.37g/L of calcium chloride, 0.42g/L of magnesium chloride, 1.21g/L of sodium sulfate and 60.74g/L of sodium chloride, and the underground water is simulated to be introduced with carbon dioxide until the underground water is saturated, so that the underground acid environment is simulated.
The test method comprises the following steps: 4g of gel material and 60mL of simulated underground water are placed in a pressure-resistant bottle and sealed, the experiment is carried out at a constant temperature of 130 ℃, the fresh simulated underground water saturated by carbon dioxide is replaced every 24 hours, the content of the SDBS released by the gel material is measured by an ultraviolet spectrophotometry, and the CAB is quantitatively analyzed by adopting two-phase titration. The experimental results are shown in table 2 below.
TABLE 2
As can be seen from fig. 1-fig. 3 and table 2, the gel material can be prepared by using the embodiment of the invention, and the gel material has both temperature resistance and corrosion inhibition performance, and has a long slow release action time of more than 7 days. Whereas the gel material of the comparative example was completely dissolved at 130 c on day 3. Among them, it can be seen from examples 1 and 6 that the preferred temperature-resistant monomer dosage scheme is more favorable for longer release.
Further, using the gel material obtained in example 1 as an example, thermogravimetric weight loss (TGA) analysis under nitrogen was performed in comparison with the PVA alone sample. As shown in FIG. 5, the decrease in mass during the temperature rise of 0-100 ℃ is the evaporation of the bound water in the pores inside the hydrogel, the weight loss of the PVA/AMPS composite gel polymer is significantly higher than that of the PVA alone by thermal decomposition, the PVA starts to decompose rapidly at about 100 ℃, and the PVA/AMPS composite gel polymer starts to decompose rapidly at 150 ℃. A small amount of mass loss is caused by thermal decomposition of the polymer at 400-500 ℃, but the PVA/AMPS composite gel polymer has small decomposition and shows better stability.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The temperature-resistant slow-release gel material is characterized by comprising 1-60 wt% of surfactant, 1.1-40 wt% of composite temperature-resistant polymer and 0-97.9 wt% of water, based on the total weight of the gel material; the composite temperature-resistant polymer comprises cross-linked polyvinyl alcohol with a structure shown in a formula (1) and a polyolefin amide sulfonic acid polymer with a structure shown in a formula (2);
wherein X is amido-2-methylpropyl or amido-2-phenylethyl; m is 1500-3000, n is 500-1000.
2. The gel material of claim 1, wherein the crosslinked polyvinyl alcohol has an alcoholysis level of 78 to 99%;
preferably, based on the total amount of the composite temperature-resistant polymer, the content of the crosslinked polyvinyl alcohol is 80-97 wt%, and the content of the polyolefin amide sulfonic acid polymer is 3-20 wt%;
more preferably, based on the total amount of the composite temperature-resistant polymer, the content of the crosslinked polyvinyl alcohol is 80-90 wt%, and the content of the polyolefin amide sulfonic acid polymer is 10-20 wt%;
preferably, based on the total amount of the gel material, the content of the surfactant is 1-50 wt%, the content of the composite temperature-resistant polymer is 1.25-25 wt%, and the content of the water is 25-97.75 wt%.
3. The gel material according to claim 1 or 2, wherein the surfactant is at least one of an anionic surfactant, a cationic surfactant, a non-ionic surfactant and an amphoteric surfactant, preferably the surfactant has an alkyl chain length of 8-18;
preferably, the anionic surfactant includes at least one of sodium alkyl sulfate, sodium alkyl sulfonate, sodium alkyl benzene sulfonate, and sodium alkyl taurate;
and/or, the cationic surfactant comprises alkyl trimethyl amine chloride and/or alkyl imidazoline amine chloride;
and/or, the nonionic surfactant comprises polyoxyethylene and/or an alkyl glycoside; more preferably, the polymerization degree of the polyoxyethylene is 4-10, and/or the polyoxyethylene is at least one of alkyl polyoxyethylene ether, alkylamine polyoxyethylene ether and castor oil polyoxyethylene ether;
and/or the amphoteric surfactant comprises alkyl amine oxide and/or alkyl betaine, more preferably at least one of alkyl amidopropyl amine oxide, alkyl amidopropyl betaine and alkyl hydroxypropyl sulfobetaine;
preferably, the surfactant is at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, cocamidopropyl betaine, and cocamidopropyl hydroxysultaine.
4. The gel material of any one of claims 1-3, wherein the gel material further comprises an initiator;
preferably, the initiator is present in an amount of 0.1 to 3 wt% based on the total amount of the gel material,
and/or the initiator comprises at least one of persulfate, benzoyl peroxide and azobisisobutyronitrile, more preferably at least one of ammonium persulfate, sodium persulfate and potassium persulfate;
preferably, the gel material further comprises polyethylene glycol and optionally an inorganic salt;
preferably, the polyethylene glycol is present in an amount of from 0.5 to 10 wt%, more preferably from 2 to 10 wt%, based on the total amount of the gel material; the content of the inorganic salt is 0 to 20% by weight, more preferably 2 to 10% by weight;
preferably, the polyethylene glycol has a weight average molecular weight of 2000 to 10000;
and/or, the inorganic salt is selected from at least one of sodium sulfate, sodium nitrate, potassium sulfate, potassium nitrate and aluminum hydroxide.
5. A preparation method of a temperature-resistant slow-release gel material is characterized by comprising the following steps: mixing a surfactant, polyvinyl alcohol, a temperature-resistant monomer and water, carrying out cross-linking polymerization reaction, and then optionally standing to obtain a temperature-resistant slow-release gel material; wherein, based on the total consumption of the raw materials, the consumption of the surfactant is 1-60 wt%, the consumption of the polyvinyl alcohol is 1-30 wt%, the consumption of the temperature-resistant monomer is 0.1-10 wt%, and the consumption of the water is 0-97.9 wt%; the temperature-resistant monomer has a structure shown in a formula (3);
wherein X is selected from amido-2-methylpropyl or amido-2-phenylethyl.
6. The method of claim 5, wherein the surfactant is used in an amount of 1 to 50 wt%, the polyvinyl alcohol is used in an amount of 1 to 20 wt%, the temperature-resistant monomer is used in an amount of 0.25 to 5 wt%, and the water is used in an amount of 25 to 97.75 wt%, based on the total amount of the raw materials;
preferably, the temperature-resistant monomer is 2-acrylamido-2-methylpropanesulfonic acid and/or 2-acrylamido-2-phenylethanesulfonic acid;
preferably, the alcoholysis degree of the polyvinyl alcohol is 88 to 99 percent;
and/or the polymerization degree of the polyvinyl alcohol is 1500-3000;
preferably, the surfactant is at least one of an anionic surfactant, a cationic surfactant, a nonionic surfactant and an amphoteric surfactant, preferably the surfactant has an alkyl chain length of 8 to 18;
preferably, the anionic surfactant includes at least one of sodium alkyl sulfate, sodium alkyl sulfonate, sodium alkyl benzene sulfonate, and sodium alkyl taurate;
and/or, the cationic surfactant comprises alkyl trimethyl amine chloride and/or alkyl imidazoline amine chloride;
and/or, the nonionic surfactant comprises polyoxyethylene and/or an alkyl glycoside; more preferably, the polymerization degree of the polyoxyethylene is 4-10, and/or the polyoxyethylene is at least one of alkyl polyoxyethylene ether, alkylamine polyoxyethylene ether and castor oil polyoxyethylene ether;
and/or the amphoteric surfactant comprises alkyl amine oxide and/or alkyl betaine, more preferably at least one of alkyl amidopropyl amine oxide, alkyl amidopropyl betaine and alkyl hydroxypropyl sulfobetaine;
preferably, the surfactant is at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, cocamidopropyl betaine, and cocamidopropyl hydroxysultaine.
7. The method of claim 5 or 6, wherein the conditions of the cross-linking polymerization reaction comprise: the temperature is 70-99 ℃, preferably 80-95 ℃, and the time is 1-5h, preferably 2-4h;
preferably, the cross-linking polymerization reaction is carried out under stirring, wherein the stirring speed is 100-200rpm;
preferably, said resting is carried out under sealed conditions;
preferably, the standing time is 12-24h.
8. The method of any of claims 5-7, wherein the method further comprises: introducing an initiator for said mixing;
preferably, the amount of the initiator is 0.1 to 3 wt% based on the total amount of the raw materials;
and/or the initiator comprises at least one of persulfate, benzoyl peroxide and azobisisobutyronitrile, and preferably at least one of ammonium persulfate, sodium persulfate and potassium persulfate;
preferably, the method further comprises: introducing polyethylene glycol and optionally an inorganic salt for said mixing, said polyethylene glycol being present in an amount of from 0.5 to 10 wt.%, more preferably from 2 to 8 wt.%, based on the total amount of each raw material; the inorganic salt is used in an amount of 0 to 20 wt%, more preferably 2 to 10 wt%;
preferably, the polyethylene glycol has a weight average molecular weight of 2000 to 10000;
and/or, the inorganic salt is selected from at least one of sodium sulfate, sodium nitrate, potassium sulfate, potassium nitrate and aluminum hydroxide;
preferably, the process of mixing comprises:
a) Dividing water into part of water C and part of water D, and carrying out first mixing on a surfactant, an optional initiator and the part of water C to prepare a surfactant mixed solution;
b) Secondly, polyvinyl alcohol, a temperature-resistant monomer, optional polyethylene glycol, optional inorganic salt and part of water D are mixed to prepare polyvinyl alcohol mixed solution;
c) Thirdly mixing the polyvinyl alcohol mixed solution and the surfactant mixed solution, and heating to the temperature of the cross-linking polymerization reaction;
more preferably, the process of mixing further comprises: in the step a), after the first mixing, heating to 40-60 ℃ to prepare the surfactant mixed solution;
and/or, in step a), the first mixing process comprises: firstly, mixing a surfactant with an optional initiator, and then mixing with part of water C;
more preferably, the process of mixing further comprises: in the step b), after the second mixing, sequentially performing pre-standing for 1-3h and pre-heating to 70-80 ℃ to prepare the polyvinyl alcohol mixed solution;
and/or, in step b), the second mixing process comprises: firstly, polyvinyl alcohol is mixed with temperature-resistant monomer, optional polyethylene glycol and optional inorganic salt, and then is mixed with part of water D.
9. The temperature-resistant slow-release gel material prepared by the preparation method of any one of claims 5 to 8.
10. Use of a gel material according to any one of claims 1 to 4 and claim 9 as a foam drainage agent, preferably in gas well drainage gas recovery.
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