A kind of surfactant for oil displacement

Abstract

The invention discloses a surfactant for driving oil. The surfactant is prepared through the following method. The method comprises steps: first, an intermediate myristyl allyl dibromo tetramethyl ethylenediamine is synthesized; second, myristyl allyl dibromo tetramethyl ethylenediamine is synthesized. The intermediate is dissolved completely in ethyl acetate, the constant temperature of 50-60 DEG C is achieved, 3-bromopropylene is added in the reaction system, after the reaction is carried out at a constant temperature with stirring for 4h, pressure reduction pumping filtration is carried out, and white solid is obtained. The white solid is subjected to recrystallization for two times by utilization of ether, drying is carried out until a constant weight is achieved, and the surfactant for driving oil is prepared. Myristyl allyl dibromo tetramethyl ethylenediamine also can be compounded with sodium phthalate of mono lauryl alcohol according to a weight ratio of 1:0.2-1, and a compound surfactant for driving oil is obtained. The synthesis technology conditions are simple, products are easy to separate, the yield is high, and industrialization is easy. Performances of the product such as salt resistance, temperature resistance, foaming property and foam stability, oil water interface tension force and the like are better than that of a traditional surfactant for driving oil.

Description

technical field [0001] The invention relates to an oil displacement agent, in particular to a surfactant for oil displacement, and belongs to the technical field of crude oil exploitation. Background technique [0002] In today's world, petroleum is still the most important energy source in our daily life and industrial production. Energy issues are related to the lifeline of a country. Intensify the research on oil recovery technology, and in the case of no new oil reservoirs, research and develop applicable enhanced oil recovery technology and put it into industrial application, so as to effectively alleviate the problem of energy supply shortage. Both primary and secondary oil recovery are physical methods, and the recovery rate of crude oil is usually only about 30%. Tertiary oil recovery can increase the oil recovery rate to about 85% through enhanced oil recovery measures. As an oil displacement agent, surfactant plays an inestimable role in greatly enhancing oil reco...

AI Technical Summary

Problems solved by technology

[0003] Existing oil displacement agents show low surface activity, high critical micelle concentration, high Krafft point, poor water solubility, low wettability, poor rheological properties, low compatibilization ability, and poor synergistic ability

Due to these shortcomings, the oil displacement effect is not ideal, and the temperature resistance, salt resistance, and foaming performance are relatively poor; it is easy to cause scaling in oil wells, and the pump inspection cycle is shortened; easy to corrode equipment

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