CN111961451A - Oil-gas well slow-release foaming agent and preparation method thereof - Google Patents
Oil-gas well slow-release foaming agent and preparation method thereof Download PDFInfo
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- CN111961451A CN111961451A CN202010881979.3A CN202010881979A CN111961451A CN 111961451 A CN111961451 A CN 111961451A CN 202010881979 A CN202010881979 A CN 202010881979A CN 111961451 A CN111961451 A CN 111961451A
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- 239000004088 foaming agent Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000006260 foam Substances 0.000 claims abstract description 101
- 239000003381 stabilizer Substances 0.000 claims abstract description 52
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 51
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000004094 surface-active agent Substances 0.000 claims abstract description 47
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims abstract description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 6
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229960004063 propylene glycol Drugs 0.000 claims abstract description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 30
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 30
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 17
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 16
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 15
- 239000000047 product Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 239000013067 intermediate product Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 10
- 238000002390 rotary evaporation Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 229930006000 Sucrose Natural products 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000005720 sucrose Substances 0.000 claims description 9
- -1 sucrose ester Chemical class 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 8
- 229940071160 cocoate Drugs 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 5
- USYVEDJTMCGMKN-UHFFFAOYSA-N 1-bromo-1,1,2,2,2-pentafluoroethane Chemical compound FC(F)(F)C(F)(F)Br USYVEDJTMCGMKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 230000002194 synthesizing effect Effects 0.000 claims description 5
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- CCRCUPLGCSFEDV-UHFFFAOYSA-N cinnamic acid methyl ester Natural products COC(=O)C=CC1=CC=CC=C1 CCRCUPLGCSFEDV-UHFFFAOYSA-N 0.000 claims description 4
- CCRCUPLGCSFEDV-BQYQJAHWSA-N methyl trans-cinnamate Chemical compound COC(=O)\C=C\C1=CC=CC=C1 CCRCUPLGCSFEDV-BQYQJAHWSA-N 0.000 claims description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical class [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000006116 polymerization reaction Methods 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
- 239000012966 redox initiator Substances 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 22
- 230000033558 biomineral tissue development Effects 0.000 abstract description 4
- 239000000295 fuel oil Substances 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 9
- 229940043237 diethanolamine Drugs 0.000 description 9
- 230000006872 improvement Effects 0.000 description 9
- 238000005187 foaming Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 230000000087 stabilizing effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 235000013162 Cocos nucifera Nutrition 0.000 description 3
- 244000060011 Cocos nucifera Species 0.000 description 3
- 229920001222 biopolymer Polymers 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000008258 liquid foam Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229940049964 oleate Drugs 0.000 description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 229910000926 A-3 tool steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 230000020477 pH reduction Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
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- 230000009044 synergistic interaction Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/38—Gaseous or foamed well-drilling compositions
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/518—Foams
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/536—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning characterised by their form or by the form of their components, e.g. encapsulated material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/70—Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
- C09K8/703—Foams
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/92—Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/94—Foams
Abstract
The invention provides an oil-gas well slow-release foaming agent and a preparation method thereof, wherein the oil-gas well slow-release foaming agent comprises the following raw materials: novel fluorocarbon surfactant, nonionic surfactant, foam stabilizer, alcohol and water; the novel fluorocarbon surfactant has a structure shown as a formula I,wherein n is 1 to 31; m is 5-22; the foam stabilizer is a polymer foam stabilizer or nano dust; the alcohol is selected from one or more of methanol, ethanol, propanol, isopropanol, ethylene glycol, glycerol, 1, 3-propylene glycol and 1, 2-propylene glycol. The oil-gas well slow-release foaming agent prepared by the invention has good high-temperature resistance, high-salt resistance, high-pressure resistance and oil resistance, and shows excellent stability under high temperature, high pressure and high mineralization degree, so that the foaming agent is suitable for effectively developing high-temperature and high-salt oil reservoirs, heavy oil reservoirs and other hard-to-use oil reservoirs in China, and has wide application prospects.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a slow-release foaming agent for an oil-gas well and a preparation method thereof.
Background
The foamed fluid with low density, high viscosity and unique rheological characteristics is widely applied to oilfield exploitation, such as foam drilling, foam cement cementing, foam acid acidification, foam fracturing, foam sand washing and well washing, foam profile control, foam flooding and the like. However, under the conditions of partial high-temperature and high-salinity oil reservoirs, the temperature resistance and salt resistance of the underground foam are changed compared with those of indoor experiments, and a defoaming phenomenon occurs, so that the expected crude oil recovery rate cannot be achieved. The essential component for forming the foam is a foaming agent, the most important property of the foaming agent is the foam performance, and the quality of the foam performance is one of the most important factors for a foam system, and the foaming capacity and the stability of the generated foam are included. Meanwhile, the stability of the foam system is influenced by various factors, but the structure and the composition of the foaming agent are important influencing factors.
The foaming agent is a surface active substance, and is mainly used for reducing the interfacial tension on an air-water interface, promoting air to form small bubbles in slurry, expanding a separation interface and ensuring that the bubbles rise to form a foam layer. Researches show that the molecular type and structure of the foaming agent can influence the foaming property and foam stability of the foam more than the temperature and pressure, and determine the temperature resistance, salt resistance and oil resistance of the foam in the stratum to a certain extent. Common foaming agents are surfactants, which can be classified as: anionic, cationic, nonionic, and zwitterionic. The foaming agent of the air foam flooding is mainly selected from anionic and nonionic types. Besides greatly reducing the surface tension of a gas-liquid interface, the foam material also has the advantages of strong foaming capacity, good foam stability, good compatibility with stratum rock fluid, certain salt resistance, oil resistance, temperature resistance and the like.
For foams, the foaming ability of the blowing agent and the stability of the resulting foam are two important static performance indicators, wherein the stability of the foam is the most critical factor in evaluating the performance of the foam. For high salt reservoirs, large amounts of Ca are in the formation water2+、Mg2+The presence of (a) severely limits the application of the foam, requiring a more stable foam.
Disclosure of Invention
The invention aims to provide an oil and gas well slow-release foaming agent and a preparation method thereof.
The technical scheme of the invention is realized as follows:
the invention provides a slow-release foaming agent for an oil and gas well, which is characterized by comprising the following raw materials: novel fluorocarbon surfactant, nonionic surfactant, foam stabilizer, alcohol and water;
the novel fluorocarbon surfactant has a structure shown as a formula I:
wherein n is 1 to 31; m is 5-22;
the foam stabilizer is a polymer foam stabilizer or nano dust;
the alcohol is selected from one or more of methanol, ethanol, propanol, isopropanol, ethylene glycol, glycerol, 1, 3-propylene glycol and 1, 2-propylene glycol.
As a further improvement of the invention, the health-care food is prepared from the following raw materials in percentage by weight: 5-15% of novel fluorocarbon surfactant, 22-35% of nonionic surfactant, 10-15% of foam stabilizer, 5-10% of alcohol and the balance of water.
As a further improvement of the invention, the health-care food is prepared from the following raw materials in percentage by weight: 7-12% of novel fluorocarbon surfactant, 25-30% of nonionic surfactant, 11-14% of foam stabilizer, 6-8% of alcohol and the balance of water.
As a further improvement of the invention, the nonionic surfactant is a mixture of diethanolamine cocoate oleate and sucrose ester, and the mass ratio of the diethanolamine cocoate to the sucrose ester is 3: (1-2).
As a further improvement of the invention, the preparation method of the novel fluorocarbon surfactant comprises the following steps:
s1, dissolving perfluorobromoethane in alcohol, adding a redox system initiator, uniformly mixing, adding tetrafluoroethylene, and synthesizing an intermediate product CF3(CF2)nBr；n＝1-31；
S2, dissolving the intermediate product, anhydrous potassium carbonate and potassium iodide in tetrahydrofuran, heating to 75-85 ℃, keeping the temperature constant for 30min, adding polyethylene glycol into the tetrahydrofuran to prepare a solution, slowly dropwise adding the solution into a reaction system, stirring and refluxing for 5-10h at the original temperature, cooling to room temperature, performing rotary evaporation on the obtained solution to remove the tetrahydrofuran, extracting with dichloromethane, performing rotary evaporation to remove the dichloromethane, and washing with a mixed solution of petroleum ether and ethyl acetate for multiple times to obtain the yellow product, namely the novel fluorocarbon surfactant.
As a further improvement of the invention, the preparation method of the novel fluorocarbon surfactant comprises the following steps:
s1, dissolving 1mol of perfluorobromoethane in 100mL of ethanol, adding 0.1mol of redox system initiator, uniformly mixing, adding 0-15mol of tetrafluoroethylene, and synthesizing an intermediate product CF3(CF2)nBr；n＝1-31；
The redox initiator is a mixture of sodium bisulfite and potassium persulfate, and the mass ratio of the substances is 1: 10;
s2, dissolving 1mol of intermediate product, 0.1-0.5mol of anhydrous potassium carbonate and 2-4mol of potassium iodide in 100mL of tetrahydrofuran, heating to 75-85 ℃, keeping the temperature for 30min, adding polyethylene glycol into the tetrahydrofuran to prepare a solution, slowly dropwise adding the solution into a reaction system, stirring and refluxing for 5-10h at the original temperature, cooling to room temperature, performing rotary evaporation on the obtained solution to remove the tetrahydrofuran, extracting with 50mL of dichloromethane, performing rotary evaporation to remove the dichloromethane, and washing with 20mL of mixed solution of petroleum ether and ethyl acetate for multiple times to obtain a yellow product, namely the novel fluorocarbon surfactant;
the molecular weight of the polyethylene glycol is 100-1000;
the volume ratio of the mixed liquid of the petroleum ether and the ethyl acetate is 5: (1-3).
As a further improvement of the invention, the polymer foam stabilizer has a structure shown in a formula II:
wherein m is 1-10; n is 2-15; o is 5-10; p is 1-15.
As a further improvement of the invention, the polymer foam stabilizer is prepared by the following method: uniformly mixing 100 parts by weight of distilled water, 50-70 parts by weight of ethanol, 15-20 parts by weight of methyl cinnamate, 10-20 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts by weight of acrylamide and 12-20 parts by weight of methyl acrylate, adjusting the pH value of the system to 6.5-7.5 by using a saturated sodium bicarbonate solution, then heating to 55-65 ℃, adding an ammonium persulfate initiator accounting for 0.2 wt% of the total concentration, continuously stirring for 3-5h, fully washing with absolute ethanol, drying and grinding to obtain a white powdery polymerization product which is a polymer foam stabilizer.
As a further improvement of the invention, the nano dust is selected from one or a mixture of more of nano aluminum, nano copper, nano zinc oxide, nano silver, nano tungsten, nano titanium dioxide and nano zirconium oxide.
The invention further provides a preparation method of the oil-gas well slow-release foaming agent, which comprises the following steps: adding the novel fluorocarbon surfactant and the nonionic surfactant into a reaction kettle, adding water, heating to 50-70 ℃, stirring for 10-15 min at 60-100r/min, then adding the foam stabilizer and the alcohol, and stirring for 30-35 min at 100-120r/min to finally prepare the slow-release foaming agent for the oil and gas well.
The invention has the following beneficial effects: the fluorocarbon type foaming agent is a novel anionic surfactant, has the advantages of three-high (high surface activity, high temperature resistance stability and high chemical stability) and two-hydrophobic (hydrophobic and oleophobic) performances, good foam performance, strong antistatic property, interaction with clay and the like, and can generate good synergistic effect and increase the oil resistance stability of the foam by compounding the fluorocarbon-containing surfactant and the nonionic surfactant under the action of the foam stabilizer; but the fluorocarbon surfactant is not economical and practical due to higher price, and the compounding of the fluorocarbon foaming agent and the nonionic surfactant can reduce the production cost, realize better foaming and foam stabilizing effects by adding a small amount of the fluorocarbon foaming agent, and promote the foam to have good heat-resistant salt performance.
The fluorocarbon surfactant is synthesized by a simple method, and has the advantages of mild reaction conditions, easy operation, high product yield, easy purification, short reaction time and few byproducts, so that the cost of the fluorocarbon surfactant is reduced, and the fluorocarbon surfactant has good performance;
the polymer foam stabilizer synthesized by the invention enables polymer molecules to form a net structure through hydrogen bonds, greatly improves the van der Waals attraction among chains, and increases the surface viscosity, thereby improving the foam stability; secondly, the liquid phase viscosity is improved, so that the liquid film is not easy to run off, and the liquid discharge rate is reduced, thereby improving the foam stability; nanometer dust is used as a foam stabilizer and covers a gas-liquid interface, a layer of solid particle-containing film is formed between bubbles, the higher the slurry concentration is, the more compact the film is, the firmer the generated foam film is, so that the drainage rate between liquid films and the diffusion of the bubbles are reduced, and the more stable the three-phase foam is;
the oil-gas well slow-release foaming agent prepared by the invention has good high-temperature resistance, high-salt resistance, high-pressure resistance and oil resistance, and shows excellent stability under high temperature, high pressure and high mineralization degree, so that the foaming agent is suitable for effectively developing high-temperature and high-salt oil reservoirs, heavy oil reservoirs and other hard-to-use oil reservoirs in China, and has wide application prospects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic synthesis scheme of the novel fluorocarbon-based surfactant of example 1 of the present invention;
FIG. 2 is a synthesis scheme of the polymeric foam stabilizer of example 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 biopolymer liquid foam stabilizer WP-322 is provided by Shandong Qilu Biotechnology group, Inc., and the quality is performed according to Q/QLS 001-.
Example 1
The raw materials comprise (by weight percent): 10% of novel fluorocarbon surfactant, 27% of coconut diethanol amine, 12% of foam stabilizer nano zinc oxide, 7% of ethanol and the balance of water.
The preparation method of the novel fluorocarbon surfactant comprises the following steps:
s1, dissolving 1mol of perfluorobromoethane in 100mL of ethanol, adding 0.1mol of redox system initiator, uniformly mixing, adding 5mol of tetrafluoroethylene, and synthesizing an intermediate product CF3(CF2)nBr；n＝11；
The redox initiator is a mixture of sodium bisulfite and potassium persulfate, and the mass ratio of the substances is 1: 10;
s2, dissolving 1mol of intermediate product, 0.25mol of anhydrous potassium carbonate and 3mol of potassium iodide in 100mL of tetrahydrofuran, heating to 80 ℃, keeping the temperature for 30min, adding polyethylene glycol into the tetrahydrofuran to prepare a solution, slowly dropwise adding the solution into a reaction system, stirring and refluxing for 5-10h at the original temperature, cooling to room temperature, performing rotary evaporation on the obtained solution to remove the tetrahydrofuran, extracting with 50mL of dichloromethane, performing rotary evaporation to remove the dichloromethane, and washing with 20mL of mixed solution of petroleum ether and ethyl acetate for multiple times to obtain a yellow product, namely the novel fluorocarbon surfactant;
the molecular weight of the polyethylene glycol is 400;
the volume ratio of the mixed liquid of the petroleum ether and the ethyl acetate is 5: 2.
the preparation method of the slow-release foaming agent for the oil and gas well comprises the following steps: adding the novel fluorocarbon surfactant and coconut diethanol amine into a reaction kettle, adding water, heating to 60 ℃, stirring for 12min at 75r/min, then adding the foam stabilizer nano zinc oxide and ethanol, and stirring for 32min at 110r/min to finally prepare the oil-gas well slow-release foaming agent.
Example 2
Compared with example 1, the nonionic surfactant is sucrose ester, and other conditions are not changed.
Example 3
Compared with the embodiment 1, the nonionic surfactant is a mixture of diethanolamine cocoate oleate and sucrose ester, and the mass ratio is 3: 1, the other conditions are not changed.
Example 4
Compared with the example 3, the foam stabilizer is a biopolymer liquid foam stabilizer WP-322, and other conditions are not changed.
Example 5
Compared with the embodiment 3, the foam stabilizer is a polymer foam stabilizer and has a structure shown as a formula II; other conditions were not changed.
The polymer foam stabilizer is prepared by the following method:
100g of distilled water, 60g of ethanol, 17g of methyl cinnamate, 15g of 2-acrylamide-2-methylpropanesulfonic acid, 10g of acrylamide and 17g of methyl acrylate are uniformly mixed, saturated sodium bicarbonate solution is used for regulating the pH value of the system to 7, then the temperature is raised to 60 ℃, ammonium persulfate initiator accounting for 0.2 wt% of the total concentration is added, the continuous stirring is carried out for 4 hours, absolute ethanol is used for fully washing, drying and grinding are carried out, and a white powdery polymerization product which is a polymer foam stabilizer is obtained.
In an infrared spectrum characterization chart of the obtained polymer foam stabilizer, the wave number is 3442cm-1A stretching vibration absorption peak of non-associated-NH; 1662cm-1Is the stretching vibration absorption peak of-C ═ O in the amide group; 625cm-1Is a C-S stretching vibration absorption peak in 2-acrylamide-2-methylpropanesulfonic acid; 2932cm-1is-CH2Absorption peak of (4); 1140cm-1Is a stretching vibration absorption peak of a sulfonic acid group in 2-acrylamide-2-methylpropanesulfonic acid; 1452cm-1Is a C-N tensile vibration absorption peak; 1390cm-1C-H is an in-plane bending vibration characteristic absorption peak; 1542cm-1Is a stretching vibration absorption peak of a benzene ring framework of methyl cinnamate; in addition, 1637cm of the spectrum-1-1645cm-1And C-free characteristic absorption peaks indicate that carbon-carbon double bonds of four monomers participating in the reaction are opened, and the synthesized product does not contain unpolymerized monomers. The functional groups appearing in the IR spectrum react with the polymerThe equations match, indicating that the desired polymer product was synthesized.
Comparative example 1
Compared with the example 5, the novel fluorocarbon surfactant is not added, and other conditions are not changed.
The raw materials comprise the following components in percentage by mass: 37% of coconut diethanol amine, 12% of polymer foam stabilizer, 7% of ethanol and the balance of water
Comparative example 2
Compared with example 5, no nonionic surfactant was added, and other conditions were not changed.
The raw materials comprise the following components in percentage by mass: 37% of novel fluorocarbon surfactant, 12% of polymer foam stabilizer, 7% of ethanol and the balance of water.
The oil and gas well slow-release foaming agent prepared by the embodiment of the invention and the comparative example and a commercial foaming agent (which is purchased from Zimboli energy science and technology Co., Ltd, and has the main components of n-isomeric monohydric alcohol or dihydric alcohol of C8-C12, the property of the n-isomeric monohydric alcohol or dihydric alcohol is light yellow green or brownish red semitransparent liquid, and the specification of the n-isomeric monohydric alcohol or dihydric alcohol is indicated with the density rho of 0.840-0.93g/cm3(ii) a Hydroxyl value mgKOH/g is more than or equal to 300-500).
Test example 1 surface tension test
The foaming agent was prepared as a 0.1 wt% and 0.01 wt% aqueous solution, and its surface tension was measured at room temperature using an interfacial tension meter. The results are shown in Table 1.
TABLE 1
Test example 2 interfacial tension test
The test standard is carried out according to GB/T6541-86 & lt oil-to-water interfacial tension measurement (Ring method) for petroleum products. Wherein the oil is kerosene and the water is an aqueous solution containing 0.01 wt% of a foaming agent. The results are shown in Table 2.
TABLE 2
Test example 3 Performance test
The degree of mineralization of the site is taken to be 32.56g/L, CaCl2500mL of a water-type water sample was added with 1.0g of the product of the foaming agent of the present invention (0.1% by mass), aged at 155 ℃ for 24 hours, and then measured at 90 ℃ by the Roche method, and the results are shown in Table 3.
TABLE 3
Test example 4 sustained Release Performance test
The corrosion experiment method is carried out according to GB10124, dynamic simulation experiment is carried out by injecting sewage on site, and the experiment steps are as follows: adding a water injection corrosion inhibitor with a certain concentration into the injected sewage, then adding the added sewage into six groups of dynamic corrosion rate evaluation instruments, hanging an A3 steel sheet, heating to 80 ℃ in a sealed manner, and measuring the corrosion rate in a 168-hour period under the condition that the stirring speed is 60 rpm. Corrosion rate (mm/a) 8.76X 107×(M1-M2) /(STD); in the formula M1G is the weight of the hanging piece before the experiment; m2G is the hanging piece mass after the experiment; s is the surface area of the hanging piece, cm2(ii) a T is the hanging film experiment time, hour; d is the density of the hanging piece material, g/cm3. And (4) calculating the corrosion inhibition rate (the corrosion rate of the sewage injected without adding the chemicals-the corrosion rate of the sewage injected after adding the chemicals) multiplied by 100/the corrosion rate of the sewage injected without adding the chemicals, calculating the corrosion inhibition rate, and observing the brightness of the test piece. The results are shown in Table 4.
TABLE 4
| Group of | Corrosion Rate (mm/a) | Rate of inhibition (%) | Brightness property |
| Example 1 | 0.0335 | 89.5 | Light brightness |
| Example 2 | 0.0294 | 90.1 | Light brightness |
| Example 3 | 0.0152 | 93.2 | Light brightness |
| Example 4 | 0.0343 | 89.2 | Light brightness |
| Example 5 | 0.0102 | 95.7 | Light brightness |
| Comparative example 1 | 0.145 | 45.6 | Is not bright |
| Comparative example 2 | 0.325 | 23.5 | Is not bright |
| Commercially available blowing agents | 0.453 | 12.7 | Is not bright |
The above table shows that the slow-release foaming agent for the oil and gas well, prepared by the invention, has good bubble performance and foam stabilizing performance, and has very low surface tension at a low concentration, wherein the surface tension is 10-21mN/m at 0.01 wt%, the surface tension is 5-14mN/m at 0.1 wt%, and the slow-release foaming agent has good corrosion inhibition performance.
In example 1, the nonionic surfactant is diethanolamine cocoate, in example 2, the nonionic surfactant is sucrose ester, in example 3, the nonionic surfactant is a mixture of diethanolamine cocoate and sucrose ester, and the mass ratio is 3: 1. the nonionic surfactant can be synergistically enhanced with the novel fluorocarbon surfactant to achieve better surface activity, the surface performance of the nonionic surfactant in the examples 1 and 2 is obviously inferior to that of the nonionic surfactant in the example 3, and the nonionic surfactant is a mixture of diethanolamine cocooleate and sucrose ester in a mass ratio of 3: 1, the surfactant has good synergistic interaction performance with a novel fluorocarbon surfactant, can obviously improve the surface activity, and has better corrosion inhibition performance.
Compared with the embodiment 3, the foam stabilizer is a biopolymer liquid foam stabilizer WP-322 in the embodiment 4, and compared with the embodiment 3, the foam stabilizer is a polymer foam stabilizer in the embodiment 5. In example 4, a common foam stabilizer is added, in example 3, nano zinc oxide is added as a foam stabilizer, nano dust is used as a foam stabilizer, the foam stabilizer covers a gas-liquid interface, a solid particle-containing thin film is formed between bubbles, the higher the slurry concentration is, the denser the film is, the firmer the generated foam film is, so that the drainage rate between liquid films and the diffusion of bubbles are reduced, and the three-phase foam is stabilized, therefore, the surface performance, the foamability and the foam stability of example 3 are better than those of example 4, but in example 5, the polymer foam stabilizer is added, and has a structure shown in formula II. The polymer foam stabilizer synthesized by the invention enables polymer molecules to form a net structure through hydrogen bonds, greatly improves the van der Waals attraction among chains, and increases the surface viscosity, thereby improving the foam stability; and secondly, the liquid phase viscosity is improved, so that the liquid film is not easy to run off, the liquid discharge rate is reduced, the foam stability is improved, and the foam stabilizing performance is obvious, so that the surface performance, the foaming performance and the foam stabilizing performance of the embodiment 5 are optimal.
Compared with the embodiment 5, the novel fluorocarbon surfactant is not added in the comparative example 1, and compared with the embodiment 5, the non-ionic surfactant is not added in the comparative example 2, the fluorocarbon end of the novel fluorocarbon surfactant synthesized by the invention has good hydrophobicity, and the polyethylene glycol end has good hydrophilicity, so that the fluorocarbon surfactant has good foaming effect, the polyethylene glycol end can form a plurality of hydrogen bonds, and also has good foam stabilizing effect on bubbles, and the combination of the fluorocarbon-containing surfactant and the non-ionic surfactant can not only generate good synergistic effect under the action of the foam stabilizer, but also increase the oil-resistant stability of the foam, so that the addition of the novel fluorocarbon surfactant and the non-ionic surfactant has synergistic effect under the action of the foam stabilizer.
Compared with the prior art, the fluorocarbon type foaming agent is a novel anionic surfactant, has the advantages of three-high (high surface activity, high temperature resistance stability and high chemical stability) and two-hydrophobic (hydrophobic and oleophobic) performances, good foam performance, strong antistatic property, interaction with clay and the like, and can generate good synergistic effect and increase the oil resistance stability of the foam by compounding the fluorocarbon-containing surfactant and the nonionic surfactant under the action of the foam stabilizer; but the fluorocarbon surfactant is not economical and practical due to higher price, and the compounding of the fluorocarbon foaming agent and the nonionic surfactant can reduce the production cost, realize better foaming and foam stabilizing effects by adding a small amount of the fluorocarbon foaming agent, and promote the foam to have good heat-resistant salt performance.
The fluorocarbon surfactant is synthesized by a simple method, and has the advantages of mild reaction conditions, easy operation, high product yield, easy purification, short reaction time and few byproducts, so that the cost of the fluorocarbon surfactant is reduced, and the fluorocarbon surfactant has good performance;
the polymer foam stabilizer synthesized by the invention enables polymer molecules to form a net structure through hydrogen bonds, greatly improves the van der Waals attraction among chains, and increases the surface viscosity, thereby improving the foam stability; secondly, the liquid phase viscosity is improved, so that the liquid film is not easy to run off, and the liquid discharge rate is reduced, thereby improving the foam stability; nanometer dust is used as a foam stabilizer and covers a gas-liquid interface, a layer of solid particle-containing film is formed between bubbles, the higher the slurry concentration is, the more compact the film is, the firmer the generated foam film is, so that the drainage rate between liquid films and the diffusion of the bubbles are reduced, and the more stable the three-phase foam is;
the oil-gas well slow-release foaming agent prepared by the invention has good high-temperature resistance, high-salt resistance, high-pressure resistance and oil resistance, and shows excellent stability under high temperature, high pressure and high mineralization degree, so that the foaming agent is suitable for effectively developing high-temperature and high-salt oil reservoirs, heavy oil reservoirs and other hard-to-use oil reservoirs in China, and has wide application prospects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The slow-release foaming agent for the oil and gas well is characterized by comprising the following raw materials: novel fluorocarbon surfactant, nonionic surfactant, foam stabilizer, alcohol and water;
the novel fluorocarbon surfactant has a structure shown as a formula I:
wherein n is 1 to 31; m is 5-22;
the foam stabilizer is a polymer foam stabilizer or nano dust;
the alcohol is selected from one or more of methanol, ethanol, propanol, isopropanol, ethylene glycol, glycerol, 1, 3-propylene glycol and 1, 2-propylene glycol.
2. The slow-release foaming agent for oil and gas wells according to claim 1, which is prepared from the following raw materials in percentage by weight: 5-15% of novel fluorocarbon surfactant, 22-35% of nonionic surfactant, 10-15% of foam stabilizer, 5-10% of alcohol and the balance of water.
3. The slow-release foaming agent for oil and gas wells according to claim 2, which is prepared from the following raw materials in percentage by weight: 7-12% of novel fluorocarbon surfactant, 25-30% of nonionic surfactant, 11-14% of foam stabilizer, 6-8% of alcohol and the balance of water.
4. The slow-release foaming agent for oil and gas wells according to claim 1, wherein the nonionic surfactant is a mixture of diethanolamine cocoate and sucrose ester, and the mass ratio of diethanolamine cocoate to sucrose ester is 3: (1-2).
5. The slow-release foaming agent for oil and gas wells according to claim 1, wherein the preparation method of the novel fluorocarbon surfactant comprises the following steps:
s1, dissolving perfluorobromoethane in alcohol, adding a redox system initiator, uniformly mixing, adding tetrafluoroethylene, and synthesizing an intermediate product CF3(CF2)nBr；n＝1-31；
S2, dissolving the intermediate product, anhydrous potassium carbonate and potassium iodide in tetrahydrofuran, heating to 75-85 ℃, keeping the temperature constant for 30min, adding polyethylene glycol into the tetrahydrofuran to prepare a solution, slowly dropwise adding the solution into a reaction system, stirring and refluxing for 5-10h at the original temperature, cooling to room temperature, performing rotary evaporation on the obtained solution to remove the tetrahydrofuran, extracting with dichloromethane, performing rotary evaporation to remove the dichloromethane, and washing with a mixed solution of petroleum ether and ethyl acetate for multiple times to obtain the yellow product, namely the novel fluorocarbon surfactant.
6. The slow-release foaming agent for oil and gas wells according to claim 5, wherein the preparation method of the novel fluorocarbon surfactant comprises the following steps:
s1, dissolving 1mol of perfluorobromoethane in 100mL of ethanol, adding 0.1mol of redox system initiator, uniformly mixing, adding 0-15mol of tetrafluoroethylene, and synthesizing an intermediate product CF3(CF2)nBr；n＝1-31；
The redox initiator is a mixture of sodium bisulfite and potassium persulfate, and the mass ratio of the substances is 1: 10;
s2, dissolving 1mol of intermediate product, 0.1-0.5mol of anhydrous potassium carbonate and 2-4mol of potassium iodide in 100mL of tetrahydrofuran, heating to 75-85 ℃, keeping the temperature for 30min, adding polyethylene glycol into the tetrahydrofuran to prepare a solution, slowly dropwise adding the solution into a reaction system, stirring and refluxing for 5-10h at the original temperature, cooling to room temperature, performing rotary evaporation on the obtained solution to remove the tetrahydrofuran, extracting with 50mL of dichloromethane, performing rotary evaporation to remove the dichloromethane, and washing with 20mL of mixed solution of petroleum ether and ethyl acetate for multiple times to obtain a yellow product, namely the novel fluorocarbon surfactant;
the molecular weight of the polyethylene glycol is 100-1000;
the volume ratio of the mixed liquid of the petroleum ether and the ethyl acetate is 5: (1-3).
7. The slow-release foaming agent for oil and gas wells according to claim 1, wherein the polymer foam stabilizer has a structure shown in formula II:
wherein m is 1-10; n is 2-15; o is 5-10; p is 1-15.
8. The slow-release foaming agent for oil and gas wells according to claim 1, wherein the polymer foam stabilizer is prepared by the following method: uniformly mixing 100 parts by weight of distilled water, 50-70 parts by weight of ethanol, 15-20 parts by weight of methyl cinnamate, 10-20 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts by weight of acrylamide and 12-20 parts by weight of methyl acrylate, adjusting the pH value of the system to 6.5-7.5 by using a saturated sodium bicarbonate solution, then heating to 55-65 ℃, adding an ammonium persulfate initiator accounting for 0.2 wt% of the total concentration, continuously stirring for 3-5h, fully washing with absolute ethanol, drying and grinding to obtain a white powdery polymerization product which is a polymer foam stabilizer.
9. The foaming agent for slow release of oil and gas wells as claimed in claim 1, wherein the nano dust is selected from one or more of nano aluminum, nano copper, nano zinc oxide, nano silver, nano tungsten, nano titanium dioxide and nano zirconium oxide.
10. A method of preparing an oil and gas well slow release foaming agent as claimed in any of claims 1 to 9, comprising the steps of: adding the novel fluorocarbon surfactant and the nonionic surfactant into a reaction kettle, adding water, heating to 50-70 ℃, stirring for 10-15 min at 60-100r/min, then adding the foam stabilizer and the alcohol, and stirring for 30-35 min at 100-120r/min to finally prepare the slow-release foaming agent for the oil and gas well.
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| CN115701437B (en) * | 2021-08-02 | 2024-01-30 | 中国石油化工股份有限公司 | Microgel temperature-sensitive foam stabilizer and preparation method thereof |
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