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Double-long-chain alkyl polyoxyethylene-polyoxypropylene ether carboxylate surfactant for oil displacement and preparation method thereof

A technology of double long-chain alkyl polyoxyethylene and polyoxypropylene ether carboxylate is applied in chemical instruments and methods, drilling compositions, etc. Expensive and other problems, to achieve good solubility, excellent interfacial tension, and the effect of reducing interfacial tension

Pending Publication Date: 2020-04-14
DAQING OILFIELD CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrophobic groups are mainly hydrocarbons, generally straight-chain hydrocarbons containing C8-C18 (can also be cycloalkanes). If the carbon number of alkanes is increased, the source of raw materials is scarce and expensive, so it is not suitable for large-scale application

Method used

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  • Double-long-chain alkyl polyoxyethylene-polyoxypropylene ether carboxylate surfactant for oil displacement and preparation method thereof
  • Double-long-chain alkyl polyoxyethylene-polyoxypropylene ether carboxylate surfactant for oil displacement and preparation method thereof
  • Double-long-chain alkyl polyoxyethylene-polyoxypropylene ether carboxylate surfactant for oil displacement and preparation method thereof

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Experimental program
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Embodiment 1

[0021] The preparation method of bis-alkoxy glyceryl ether polyoxyethylene-polyoxypropylene ether carboxylate comprises the following steps:

[0022] (1) 1,3-dialkoxy-2-propanol (I)

[0023] Add 0.5mol of fatty alcohol (n-octanol, n-decyl alcohol or dodecanol), 0.01mol of tetrabutylammonium bromide, 0.7mol of KOH and 400mL of n-hexane into a 1,000mL three-neck round bottom flask. Mix with mechanical stirring for half an hour, then slowly add 0.5mol epichlorohydrin dropwise with a constant pressure dropping funnel, and control the drop for 1 hour, and control the temperature not higher than 30°C. After the dropwise addition, the temperature was gradually raised to 50° C., and the reaction was continued for 6 h. After the reaction was completed, the mixture was transferred to a beaker, left to stand overnight, and then filtered to remove salt, and the filtrate was rotovapped to remove the solvent. Finally, the alkyl glycidyl ether product (C 8 GE, 130~135℃ / 3kPa; C 10 GE, 140...

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Abstract

The invention discloses a dialkoxy glyceryl ether polyoxyethylene-polyoxypropylene ether carboxylate surfactant for oil displacement and a preparation method thereof. The method comprises the following steps: reacting a long-chain fatty alcohol with epoxy chloropropane to generate 1, 3-dialkoxy-2-propanol (I), carrying out addition reaction of 1, 3-dialkoxy-2-propanol (I), epoxypropane and ethylene oxide in sequence to generate dialkoxy glyceryl ether polyoxyethylene-polyoxypropylene ether (II), and carrying out carboxymethylation on the dialkoxy glyceryl ether polyoxyethylene-polyoxypropyleneether (II) by using chloroacetic acid to obtain the dialkoxy glyceryl ether polyoxyethylene-polyoxypropylene ether carboxylate surfactant. The surfactant prepared by the method has good dissolving performance, interface performance, emulsifying performance and oil displacement effect under low-alkalinity or alkali-free conditions. Wherein the dialkoxy glyceryl ether polyoxyethylene-polyoxypropylene ether carboxylate (diC10GE-E15P10-CS) is suitable for being used as a low-alkalinity surfactant, is used for ASP flooding of an oil field, and has relatively high oil displacement efficiency; the dialkoxy glyceryl ether polyoxyethylene-polyoxypropylene ether carboxylate (diC12GE-E15P10-CS) is suitable for being used as an alkali-free surfactant, and is used for binary combination flooding of anoil field.

Description

Technical field: [0001] The present invention relates to the surfactant in the composite oil displacement system used in the oil exploitation process, in particular to a double long chain alkyl polyoxyethylene-polyoxypropylene ether carboxylate surfactant for oil displacement and a preparation method thereof . Background technique: [0002] Fatty alcohol polyoxyethylene ether carboxylate is an important class of anionic surfactants, which are modified by nonionic surfactants, because they have a ring with a certain addition number embedded between the hydrophobic group and the hydrophilic group. Oxyethane, adding a hydrophilic group (OCH 2 CH 2 ) n , which integrates many characteristics of anionic surfactants and nonionic surfactants, it can not only be compounded with anionic, nonionic, and zwitterionic surfactants, but also can be compounded with cationic surfactants. Generally, anionic surfactants Activity does not have such advantages, it has the characteristics of ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08G65/332
CPCC09K8/584C08G65/3322
Inventor 伍晓林侯兆伟王海峰陈劼杨勇单厚菲吴国鹏苑登御单存龙刘庆梅李凌云
Owner DAQING OILFIELD CO LTD
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