Petroleum sulfonate anionic surfactant and preparation method thereof

Abstract

The invention relates to a petroleum sulfonate anionic surfactant and a preparation method thereof. The method comprises the following steps: mixing a crude oil fraction and a solvent phase, and carrying out sulfonation reaction at -20-30 DEG C by using liquid sulfur trioxide or fuming sulfuric acid as a sulfonating agent; aging the sulfonated product, and carrying out neutralization reaction until the reaction product becomes neutral or slightly alkaline; and separating the product of the neutralization reaction to obtain the petroleum sulfonate anionic surfactant. The invention also provides a petroleum sulfonate anionic surfactant prepared by the method. The preparation method has the characteristics of simple preparation technique, low investment cost and the like. The petroleum sulfonate anionic surfactant prepared by the method has higher adaptability and oil displacement efficiency than other chemical oil displacement agents.

Description

technical field [0001] The invention relates to a preparation method of a petroleum sulfonate anionic surfactant, and the petroleum sulfonate anionic surfactant prepared by the preparation method and used for oil displacement. Background technique [0002] With the long-term development of the old oilfields in eastern China (Daqing, Shengli, Liaohe, Dagang and other old oilfields), all of them have entered the later development stage of "three highs" (high water cut, high recovery degree, high oil recovery rate). Due to technical reasons for the development of secondary oil recovery (water injection development stage), only about 30% of the oil reserves can be recovered. In order to increase the ultimate recovery of old oil fields, only the application of tertiary oil recovery (chemical flooding) technology. According to laboratory tests, the application of chemical flooding (tertiary recovery) technology can increase the recovery rate by 8-10%, and the oil sulfonate floodi...

AI Technical Summary

Problems solved by technology

[0003] No. 200710179265.2 Chinese patent application discloses a preparation method and application of a sulfonate surfactant, which solves the problems of complex preparation process, easy acid slag generation and high production cost in the existing preparation method

However, according to the preparation method disclosed in this patent application, the active matter content of the sulfonate surfactant prepared is still low, only about 25-30%, the reactivity of the product is not high, and the transportation cost is still relatively high

[0004] Simultaneously, in the preparation method of existing sulfonate surfactant, the temperature of sulfonation reaction is all higher

However, since the sulfonation reaction is a violent exothermic reaction, the distillate oil will be dehydrated easily if the initial temperature is too high, resulting in a large amount of coke and coking, resulting in a decrease in yield and blockage of pipelines.