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High-temperature-resistant and high-salinity-resistant furfural extract oil sulphonate system and preparation method thereof

A technology for extracting oil and oil sulfonate from furfural, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex production process of anionic nonionic surfactants, unsuitable for large-scale production, etc., and achieve good Application prospects, excellent high temperature resistance, and the effect of enhancing oil recovery

Active Publication Date: 2016-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex production process of this type of anionic nonionic surfactant, it is not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add furfural to the reaction vessel to extract the oil, 1,2-dichloroethane as a solvent, stir, slowly raise the temperature to 45°C, add concentrated sulfuric acid dropwise, control the reaction temperature not to exceed 60°C, react for 1 hour, and finally slowly add mass Sodium hydroxide solution with a concentration of 25% is used to obtain crude furfural oil sulfonate, which is extracted by rotary steaming, isopropanol and petroleum ether (volume ratio 1:1), and absolute ethanol desalination to obtain furfural oil sulfonic acid Salt. Take another reactor, add 25g of furfural to extract oil sulfonate, 25g of cetyltrimethylammonium chloride, 50g of water, slowly heat up and stir, raise the temperature to 45°C, and continue stirring for 0.5 hours to obtain high-temperature-resistant high-salt furfural extract Oil sulfonate system. Sampling was prepared into a 0.03% solution, and the interfacial tension between it and crude oil in an oilfield reached 1.6×10 -3 mN / m. A...

Embodiment 2

[0017] Add furfural to the reaction vessel to extract the oil, 1,2-dichloroethane as a solvent, stir, slowly raise the temperature to 60°C, add concentrated sulfuric acid dropwise, control the reaction temperature not to exceed 70°C, react for 1 hour, and finally slowly add mass 25% sodium hydroxide solution, neutralized to a pH value of 9-10 to obtain oil sulfonate extracted from crude furfural, extracted by rotary steaming, isopropanol and petroleum ether (volume ratio 1:1), anhydrous ethanol Desalination and other steps to obtain furfural extract oil sulfonate. Take another reactor, add 10g of furfural to extract oil sulfonate, 15g of cetyltrimethylammonium chloride, 75g of water, slowly heat up and stir, raise the temperature to 45°C, and continue stirring for 0.5 hours to obtain high-temperature-resistant high-salt furfural extract Oil sulfonate system. Sampling was prepared into a 0.05% solution, and the interfacial tension between it and crude oil in an oilfield reache...

Embodiment 3

[0019] Add furfural to the reaction vessel to extract the oil, 1,2-dichloroethane as a solvent, stir, slowly raise the temperature to 50°C, add concentrated sulfuric acid dropwise, control the reaction temperature not to exceed 70°C, react for 1 hour, and finally slowly add mass 25% sodium hydroxide solution, neutralized to a pH value of 9-10 to obtain oil sulfonate extracted from crude furfural, extracted by rotary steaming, isopropanol and petroleum ether (volume ratio 1:1), anhydrous ethanol Desalination and other steps to obtain furfural extract oil sulfonate. Take another reactor, add 25g of furfural to extract oil sulfonate, 25g of lauric acid diethanolamide, 50g of water, slowly heat up and stir, raise the temperature to 45°C, and continue stirring for 0.5 hours to obtain a high-temperature-resistant high-salt furfural extract oil sulfonate system . Sampling was made into a 0.03% solution, and the interfacial tension between it and crude oil in an oilfield reached 2.6×...

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Abstract

The invention relates to a high-temperature-resistant and high-salinity-resistant furfural extract oil sulphonate system and a preparation method thereof. The preparation method comprises the following two steps: (1) adding furfural extract oil and 1,2-dichloroethane in a reaction vessel, heating up, starting stirring, dropwise adding concentrated sulfuric acid slowly, dropwise adding a sodium hydroxide solution slowly to neutralize after the concentrated sulfuric acid is added dropwise, carrying out rotary evaporation to remove the 1,2-dichloroethane, drying, adding isopropanol and petroleum ether to carry out extraction, removing unreacted raw materials, evaporating to be dry, removing salt with absolute ethyl alcohol, and evaporating to be dry so as to obtain furfural extract oil sulphonate; and (2) adding the furfural extract oil sulphonate, cetrimonium chloride or dodecyl acid diethanolamide and water in the reaction vessel, and heating up and stirring for 30 minutes to obtain the high-temperature-resistant and high-salinity-resistant furfural extract oil sulphonate system. The furfural extract oil sulphonate system for tertiary oil recovery can reduce tension of an oil-water interface to be ultra-low (below 1*10-2 mN / m) under the conditions of high temperature, high salinity and zero alkali, oil recovery efficiency is improved by above 16.4%, and the high-temperature-resistant and high-salinity-resistant furfural extract oil sulphonate system has a good application prospect in a high-temperature and high-salinity oil reservoir.

Description

technical field [0001] The invention relates to a high-temperature-resistant high-salt furfural extraction oil sulfonate system and a preparation method thereof. Background technique [0002] In oilfield development, even in the most ideal reservoir, traditional primary oil recovery (using the natural energy of the reservoir) and secondary oil recovery (water injection or gas injection, etc.) can only recover 40%-60% of the original crude oil reserves; If the formation conditions are not ideal, even 80% of the original geological reserves remain underground after primary and secondary oil recovery. The tertiary oil recovery technology that has been used now is to use physical or chemical methods to extract. There are many kinds of surfactants used in tertiary oil recovery at home and abroad, and petroleum sulfonate synthesized from petroleum distillate oil is widely used in tertiary oil recovery. However, for high-temperature and high-salt oil reservoirs, petroleum sulfona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 曾志强袁俊秀朱魁黄冬杨智中
Owner CHINA PETROLEUM & CHEM CORP
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