A kind of anionic nonionic amphoteric surfactant for oil displacement and preparation method thereof
A surfactant, anionic and nonionic technology, applied in the field of anionic and nonionic amphoteric surfactants for oil displacement and its preparation, can solve problems such as failure to drive oil, cross surface activity, total recovery less than 50%, and achieve Improved salt resistance, low interfacial tension, and good compatibility
Active Publication Date: 2020-11-20
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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Problems solved by technology
Due to the large original geological reserves of these oilfields, the total recovery rate is still less than 50% when water flooding reaches 100% water cut
[0005] Conventional lignosulfonate produced from lignin is a commonly used surfactant in China, but its surface activity is poor, and it is mainly used as a dispersant for liquid-solid dispersion systems. Usually, the surface tension of its aqueous solution is about 50mN / m. Moreover, the critical micelle concentration is very high, and the modified lignosulfonate, after introducing lipophilic components in its structure, has high water solubility, but it cannot form ultra-low interfacial tension with crude oil when used alone, so it cannot be used directly oil drive
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Embodiment 1
[0027] A kind of preparation method of anionic nonionic amphoteric surfactant for oil displacement, it is characterized in that, comprises the following steps:
[0028] (1) Purified lignin 100g, sodium hydroxide 1g, dissolved in 100g toluene, nitrogen environment, temperature 120°C, reaction pressure 1.0MPa, stirred for 15min, added 50g of ethylene oxide, 50g of propylene oxide in 10 Alternately add twice, after all adding, stop stirring, naturally cool to room temperature, and keep the pressure, then after decompression distillation removes the low-boiling point fraction, obtain lignin alcohol ether;
[0029] (2) Alkylphenol polyoxyethylene ether 100g, 10g sodium hydroxide, mix and heat up to 40-60°C, stir evenly, add 10ml formaldehyde, keep reaction temperature 50°C, react for 5 hours to obtain alkylphenol polyoxyethylene Ether hydroxymethyl intermediate;
[0030](3) Mix the intermediate obtained in step 1 with phloroglucinol at a molar ratio of 1:2.1, add 1.2 mol of n-buty...
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The invention relates to an anionic-nonionic amphoteric surfactant for oil displacement, wherein the surfactant is the phloroglucinol disulfonate of alkylphenol polyoxyethylene ether and lignin alcohol ether, the chemical general formula is represented by a formula 1 defined in the specification, R1 is C9-C16 branched chain or linear chain alkyl, x and y are the addition numbers of ethoxy groups,x is 8-20, y is 6-10, Lignin is lignin in English and represents the structure of lignin, and Y is an alkali metal. According to the present invention, with the anionic-nonionic amphoteric surfactant,the tension at the water-oil interface can be reduced, the molecular hydration ability of the surfactant can be improved through different nonionic hydrophilic groups, and the interaction between theion head group and the metal cation in the solution can be weakened.
Description
technical field [0001] The invention relates to the field of oil displacement additives for oil fields, in particular to an anionic nonionic amphoteric surfactant for oil displacement and a preparation method thereof. Background technique [0002] With the prolongation of development time, some large domestic oilfields, such as Daqing Oilfield and Shengli Oilfield, have comprehensive water cut close to or 90%. Due to the large original geological reserves of these oilfields, the total recovery rate is still less than 50% when water flooding reaches 100% water cut. Therefore, in order to maximize the recoverable reserves of the oilfield and maintain a relatively high oil recovery rate, some tertiary oil recovery technologies that reduce the interfacial tension between oil and water by injecting surfactants, improve oil displacement efficiency, and finally achieve a substantial increase in oil recovery, Technologies such as alkali-surfactant-polymer ASP flooding and foam comp...
Claims
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IPC IPC(8): C09K8/584C08G81/00
CPCC08G81/00C09K8/584
Inventor 周传臣王志宏庞玉山李雷振肖劲松安丽媛张杰冯红岩柳敏郭永平陈芝娟孙建平甄巧玲
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM