Preparation and application of a kind of gemini amphiphilic surfactant

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 format...

AI Technical Summary

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.

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