A preparation method of hybrid fluorine-containing surfactant for oil displacement in ultra-low permeability reservoirs

A surfactant, oil penetration technology, applied in the fields of surface, organic chemistry, interfacial chemistry and enhanced oil recovery, can solve problems such as poor salt resistance, poor ability to reduce oil-water interfacial tension, and low interfacial tension

Inactive Publication Date: 2020-10-13
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a fluoroactive agent that can significantly improve the surface of the rock, aiming at the poor ability to reduce the interfacial tension of oil and water, poor salt resistance, and few varieties, which can be used in ultra-low permeability reservoirs. It has excellent water phase non-wetability, and has low surface and interfacial tension at the same time. It can be used for the preparation of low-molecular hybrid fluorine-containing surfactants for oil displacement in ultra-low permeability reservoirs. It is characterized by 2-perfluoro Alkyl alcohol C n f 2n+1 CH 2 CH 2 OH, at least one of the integer n=4~18 is a synthetic raw material, and at least one of the halogenated alkyl sodium salts is another synthetic raw material, and the halogenated alkyl sodium salt includes chloroalkyl sodium Cl(CH 2 ) m COONa, integer m=2~5, sodium bromoalkylate Br(CH 2 ) m COONa, integer m=2~5, sodium iodoalkylate I(CH 2 ) m COONa, integer m=2~5, sodium chloroalkylsulfonate Cl(CH 2 ) m SO 3 Na, integer m=2~5, sodium bromoalkylsulfonate Br(CH 2 ) m SO 3 Na, integer m=2~5, sodium iodoalkylsulfonate I(CH 2 ) m SO 3 Na, integer m=2~5, represented by sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), sodium hydride (NaH), potassium hydride (KH), calcium hydride (CaH 2 ), sodium hydroxide (NaOH), potassium hydroxide (KOH), potassium carbonate (K 2 CO 3 ), sodium carbonate (Na 2 CO 3 ), potassium bicarbonate (KHCO 3 ) and sodium bicarbonate (NaHCO 3 ) at least one as a catalyst, using at least one of tetrahydrofuran, N,N-dimethylformamide, dichloromethane, chloroform, ethyl acetate and cyclohexane as a solvent to synthesize a carbon-containing A hybrid fluorosurfactant C with fluorine bond and carbon-hydrogen bond n f 2n+1 CH 2 CH 2 O(CH 2 ) m COONa, integer n=4~18, integer m=2~5 and C n f 2n+1 CH 2 CH 2 O(CH 2 ) m SO 3 Na, integer n=4~18, integer m=at least one of 2~5, hybrid fluorine-containing surfactant referred to as HFS

Method used

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  • A preparation method of hybrid fluorine-containing surfactant for oil displacement in ultra-low permeability reservoirs
  • A preparation method of hybrid fluorine-containing surfactant for oil displacement in ultra-low permeability reservoirs
  • A preparation method of hybrid fluorine-containing surfactant for oil displacement in ultra-low permeability reservoirs

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add 40 grams of tetrahydrofuran and 2.830 grams of catalyst sodium hydride into a three-necked reaction flask equipped with a reflux condensing device. In an ice bath, add a solution containing 40 grams of tetrahydrofuran and 20 grams of 2-perfluorohexyl ethanol drop by drop, and stir for 4 hours. , and then the temperature was raised to 70° C., a solution containing 30 grams of tetrahydrofuran and 5.210 grams of sodium 4-chlorobutyrate was added dropwise, and the reaction was continued for 54 hours. The solvent was distilled off from the reaction product under reduced pressure to obtain a crude product, which was then separated by silica gel column chromatography to obtain a hybrid fluorosurfactant with a yield of 82%.

Embodiment 2

[0033] Add 120 grams of N,N-dimethylformamide and 4.247 grams of catalyst calcium hydride into a three-necked reaction flask equipped with a reflux condensation device. In an ice bath, add 120 grams of N,N-dimethylformamide dropwise. and a solution of 20 grams of 2-perfluorooctyl ethanol, stirred and reacted for 4 hours, then heated to 60°C, and added dropwise a solution containing 60 grams of N,N-dimethylformamide and 6.058 grams of sodium 3-bromopropionate , continue to react for 48 hours. The solvent was distilled off from the reaction product under reduced pressure to obtain a crude product, which was then separated by silica gel column chromatography to obtain a hybrid fluorosurfactant with a yield of 78%.

Embodiment 3

[0035] Add 80 grams of tetrahydrofuran, 20 grams of ethyl acetate, and 3.532 grams of catalyst sodium into a three-necked reaction flask equipped with a reflux condensation device. In an ice bath, add 80 grams of tetrahydrofuran and 20 grams of 2-perfluorododecylethanol dropwise. gram of solution, stirred and reacted for 4 hours, then heated to 55°C, added dropwise a solution containing 50 grams of tetrahydrofuran and 8.350 grams of sodium 4-iodobutylsulfonate, and continued to react for 60 hours. The solvent was distilled off from the reaction product under reduced pressure to obtain a crude product, which was then separated by silica gel column chromatography to obtain a hybrid fluorosurfactant with a yield of 89%.

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Abstract

The invention discloses a preparation method of a hybrid fluorine-containing surfactant for oil displacement in an ultra low permeability oil reservoir. The method is characterized by comprising the steps: each component is weighed in parts by weight, 20 to 200 parts of solvents and 1.0 to 12 parts of catalysts are added in a three-neck reaction flask equipped with a reflux condenser, a solution containing 20 to 300 parts of solvents and 20 parts of 2-perfluoroalkyl ethanol is added dropwise in an ice bath, the reaction is stirred for 4 hours, then the temperature is raised to 45 to 95 DEG C,a solution containing 10 to 200 parts of solvents and 1.5 to 18 parts of haloalkyl sodium salt is added, and the reaction is continued for 24 to 60 hours. The reaction product is distilled off under reduced pressure to remove solvents to obtain a crude product, silica gel column chromatography separation is conducted to obtain the hybrid fluorine-containing surfactant in a yield of 65 to 90%. Thehybrid fluorine-containing surfactant has good surface and interface activity, can significantly increase a non-wetting property of a water phase on a rock surface, significantly reduces the capillarypressure of the ultra-low permeability reservoir, reduces the bound water of the rock surface, and can also enable crude oil to be easily displaced from the rock surface.

Description

[0001] 1. Technical field [0002] The invention relates to a preparation method of a hybrid fluorine-containing surfactant for oil displacement in ultra-low permeability reservoirs. The fluorine-containing surfactant can be used as an oil displacement agent in tertiary oil recovery technology, and belongs to organic chemistry, surface and interface field of chemistry and enhanced oil recovery. [0003] 2. Background technology [0004] my country's ultra-low permeability reservoirs are rich in geological reserves of petroleum. For ultra-low permeability reservoirs in China, the reservoirs basically have no natural production capacity, and can only be put into production after reservoir fracturing. Water injection development has always been the main method. The pressure is high, and the Jiamin effect is obvious. After the oil well is operated, water lock is easy to occur, and the production declines rapidly. Therefore, the recovery rate is low, and the development effect and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/10
CPCC07C51/367C07C51/41C07C303/32C09K8/584C07C309/10C07C59/125
Inventor 钟传蓉吴晓钢杨艳
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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