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Preparation method and application of gemini amphiphilic surfactant

A surfactant and amphiphilic technology, applied in the direction of sulfonate preparation, drilling compositions, chemical instruments and methods, etc., can solve the problems of large adsorption loss, achieve reduced interfacial tension, stable performance, and temperature resistance The effect of low performance

Active Publication Date: 2013-10-30
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, most of the gemini surfactants synthesized in our country are quaternary ammonium salt ionic surfactants. The adsorption loss on the clay minerals in the oil layer is relatively large, and the gemini surfactants that are actually used in the oil field need further research.

Method used

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  • Preparation method and application of gemini amphiphilic surfactant
  • Preparation method and application of gemini amphiphilic surfactant
  • Preparation method and application of gemini amphiphilic surfactant

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Embodiment Construction

[0021] Add 27g of octadecylamine and 25g of 3-chloro-2-hydroxypropanesulfonate into 100g of isopropanol containing 0.5g of tetrabutylammonium bromide, heat to reflux, and react for 10 hours, then add 5g of sodium hydroxide, Adjust the pH to 8-9, then add 4 g of 1,2-dichloroethane, and heat to reflux for 24 hours. Stop heating, let stand, spend the night, and the reaction solution is removed solvent by decompression distillation, obtains C 18 Alkyl gemini amphiphilic surfactants are washed and recrystallized to obtain pure products with a measured yield of 66%.

[0022] Get the gemini amphiphilic surfactant 35g that above-mentioned method prepares, secondary alkyl sodium sulfonate 25g, sorbitan monooleate 15g, water 20g, fully stir, obtain effective content and be 80% oil displacement surfactant system.

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Abstract

The invention relates to a gemini amphiphilic surfactant as well as a preparation method and application thereof. The preparation method comprises the following steps of: adding n-octadecylamine and 3-chloro-2-hydroxy propyl sulfonic acid sodium of which the amount ratio is 1:(1.2-1.3) into a solvent containing a phase transfer catalyst to perform heating and refluxing, and standing for a night; adding a pH regulator into a reaction generated solution, adjusting the pH value of the system to be 8-9, and adding 1,2-dichlorethane, wherein the added amount of the 1,2-dichlorethane is metered according to the amount ratio of the n-octadecylamine to the 1,2-dichlorethane of 2:1 to 5:2; heating, refluxing, and standing for a night; and removing the solvent from the reaction generated solution through reduced pressure distillation to obtain the gemini amphiphilic surfactant. The gemini amphiphilic surfactant is used by compounding with sec-alkyl sodium sulphonate and sorbitol anhydride single oleate, the mineralization degree of the surfactant at 60 DEG C reaches 50000mg / L, and the interfacial tension with crude oil can reach 10<-3>mN / m, so that the crude oil recovery ratio can be effectively improved.

Description

technical field [0001] The invention relates to a synthesis and application method of a gemini surfactant used for tertiary oil recovery and enhanced recovery. Background technique [0002] At present, my country's domestic oil fields are basically using water flooding to develop oil. Most oil fields have entered the late stage of water flooding development. After primary and secondary oil recovery, the oil recovery rate is only 40%, and more than 50% of the crude oil is still unrecoverable. Therefore, it is urgent to carry out tertiary oil recovery and enhance oil recovery. However, most of the residual oil stays in the oil layer in the form of film, column, cluster, etc. Water flooding cannot overcome the capillary force, adhesion force and cohesion force of the residual oil, making it difficult to recover crude oil. Adding a suitable surfactant to the injected water can greatly reduce the interfacial tension between the injected water and the residual oil in the formatio...

Claims

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Application Information

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IPC IPC(8): C09K8/584C07C309/14C07C303/32
Inventor 郭方元谭俊领慕立俊李宪文黎晓茸杨海恩张涛贾玉琴杨棠英刘笑春马丽萍郑力军
Owner PETROCHINA CO LTD
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