Alkyl group polyoxyethylene ether surface active agent with Guerbet structure and preparation method and application thereof

Abstract

The invention relates to an alkyl group polyoxyethylene ether surface active agent with a Guerbet structure and a preparation method and the application thereof, which is applied to the tertiary oil recovery technology; alpha-olefin with dialkyl, which is obtained by catalyzing dimerization by the alpha-olefin with short carbon chain, is used as starting material, and after a series of the chemical reaction, the corresponding alkyl group polyoxyethylene ether surface active agent with the Guerbet structure is prepared; the surface active agent comprises a quaternary ammonium cationic surfactant of alkyl polyoxyethylene ether hydroxypropyl and a carboxylic acid oxyneurines amphoteric surfactant of alkyl group polyoxyethylene ether hydroxypropyl, a special molecular structure determines the alkyl group polyoxyethylene ether surface active agent to have good water solubility, low critical micelle concentration, good surface or interface tensile force reduction capacity and high-efficiency foaming capacity, ultra-low oil-water interface tensile force (10-3mN / m) is formed between the brine solution energy and crude oil, therefore, the alkyl group polyoxyethylene ether surface active agent which is used as an effective oil displacement agent has application potential in the tertiary oil recovery; the surface active agent has the following chemical structure.

Description

technical field [0001] The invention belongs to the field of high-efficiency surfactants, in particular to an alkyl polyoxyethylene ether surfactant with a Gubet structure used in tertiary oil recovery technology and its preparation method and application. The alkyl polyoxyethylene ether surfactant with a Gubet structure Oxyethylene ether surfactants include alkyl polyoxyethylene ether hydroxypropyl quaternary ammonium salt cationic surfactants and alkyl polyoxyethylene ether hydroxypropyl carboxybetaine zwitterionic surfactants. Background technique [0002] In the tertiary oil recovery technology, whether it is using surfactant flooding (micelle, microemulsion or foam), or using ASP flooding (combination of alkali / surfactant / polymer), it is inseparable to choose a A suitable surfactant is used to reduce the interfacial tension of oil and water, so that the interfacial tension of oil and water can reach ultra-low (10 -3 -10 -4 mN / m), so as to greatly increase the recovery...

AI Technical Summary

Problems solved by technology

Jin Zhiqiang etc. have invented a kind of surfactant of Jubet alcohol polyoxyethylene ether sulfate sodium salt in CN1470317, because its unique branched chain structure makes it have excellent interface / surface property; But, because Gubet Alcohol raw materials must be prepared by catalysis of short-chain alcohols, and the palladium / carbon catalyst used therein is expensive, which is not conducive to large-scale production. Far inferior to commonly used quaternary ammonium salt (CTAB) cationic surfactants

The disadvantage of cetyltrimethylammonium bromide (CTAB) wetting agent is its critical micelle concentration (CMC) (1x10 -3 mol / L) is relatively too high, and the adsorption amount on the reservoir rock is too large, resulting in high cost of use

In order to obtain a surfactant with more excellent surface properties and wetting properties, the present invention designs and prepares the surfactant by changing the structure of the hydrophilic group on the basis of the Gubet alcohol polyoxyethylene ether sulfate sodium salt surfactant Surfactants with quaternary ammonium salt cations, carboxybetaine zwitterions, and polyoxyethylene ether sulfate ester salts with polyoxyethylene ether hydroxypropyl groups have been discovered. So far, there have been no cationic and zwitterionic surfactants with this structure. See the report

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