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Composite surfactant and preparation method thereof

A composite surfactant and surfactant technology, applied in the field of composite surfactant and its preparation, can solve the problems of poor temperature resistance and salt resistance, increased oil-water interfacial tension, low interfacial activity, etc., and achieve excellent temperature resistance, The effect of increasing surface activity and increasing hydrophilicity

Inactive Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] One of the technical problems to be solved by the present invention is that in the prior art, the surfactant used as the main component of the oil displacement agent system has low interfacial activity, poor temperature resistance and salt resistance, and the oil-water interface is damaged due to the decrease in concentration during the formation migration process. The problem of increased tension, providing a new complex surfactant

Method used

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  • Composite surfactant and preparation method thereof
  • Composite surfactant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (a) Synthesis of octadecyl polyoxypropylene (m=3) polyoxyethylene (n=10) ether

[0051] Add 270 grams (1 mole) of stearyl alcohol, 5 grams of potassium hydroxide and 1.75 grams of anhydrous potassium carbonate to a pressure reactor equipped with a stirring device. Dehydrate under vacuum for 2 hours, then replace with nitrogen for 3 to 4 times, adjust the reaction temperature of the system to 150°C and slowly introduce 176.9 grams (3.05 moles) of propylene oxide, control the pressure ≤ 0.40MPa, after the reaction of propylene oxide is completed , lower the temperature, and slowly feed 444.4 grams (10.1 moles) of ethylene oxide at 140° C. to control the pressure to ≤0.60 MPa. After the reaction, lower the temperature to 90°C, remove low boilers in vacuum, neutralize and dehydrate after cooling to obtain 869.9 grams of stearyl alcohol polyoxypropylene (m=3) polyoxyethylene (n=10) ether, with a yield of 98.4% .

[0052] (b) Synthesis of octadecyl polyoxypropylene (m=3) po...

Embodiment 2

[0057] (a) Synthesis of nonylphenol polyoxypropylene (m=8) polyoxyethylene (n=6) ether

[0058]Add 220 grams (1 mole) of nonylphenol, 4 grams of potassium hydroxide and 2.6 grams of anhydrous potassium carbonate to a pressure reactor equipped with a stirring device, and when heated to a reaction temperature of 80-90°C, open the vacuum system and Dehydrate under vacuum for 1 hour, then replace with nitrogen for 3 to 4 times, adjust the reaction temperature of the system to 150°C and slowly introduce 469.8 grams (8.1 moles) of propylene oxide, control the pressure ≤ 0.50MPa, after the reaction of propylene oxide is completed , lower the temperature, and slowly feed 266.2 grams (6.05 moles) of ethylene oxide at 130° C., and control the pressure to ≤0.60 MPa. After the reaction, the same post-treatment as in [Example 1] was performed to obtain 921.5 g of nonylphenol polyoxypropylene (m=8) polyoxyethylene (n=6) ether, with a yield of 97.2%.

[0059] (b) Synthesis of potassium nony...

Embodiment 3

[0063] (a) Synthesis of behenylpolyoxypropylene (m=4) polyoxyethylene (n=2) ether

[0064] Add 326 grams (1 mole) of behenyl alcohol, 5 grams of potassium hydroxide and 5.5 grams of anhydrous potassium carbonate into the pressure reactor equipped with a stirring device, and when the reaction temperature is 80-90 ° C, open the vacuum system and Dehydrate under high vacuum for 2 hours, then replace with nitrogen for 3 to 4 times, adjust the reaction temperature of the system to 160°C and slowly introduce 234.9 grams (4.05 moles) of propylene oxide, control the pressure ≤ 0.60MPa, and wait until the reaction of propylene oxide is completed After that, the temperature was lowered, and 90.2 g (2.05 moles) of ethylene oxide was slowly introduced at 140° C., and the pressure was controlled to be ≤0.60 MPa. After the reaction, the same post-treatment as in [Example 1] obtained 619.5 g of behenyl polyoxypropylene (m=4) polyoxyethylene (n=2) ether, with a yield of 95.9%.

[0065] (b) S...

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Abstract

The invention relates to a composite surfactant and a preparation method thereof, and mainly solves the problems of bad interface activity, bad temperature and salt resistance, and oil-water interface tension force rise caused by concentration reduction in a stratum migration process of surfactants used as a main component of oil displacement agent systems in the prior art. The composite surfactant is an alkyl alcohol or alkyl phenol polyoxyethylene polyoxypropylene ether carboxylate or sulfonate and zwitterionic surfactant composite surfactant, can well solve the problems, and can be used in tertiary oil recovery production of oilfields.

Description

technical field [0001] The invention relates to a composite surfactant and a preparation method. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention. In today's increasingly tense energy sources, enhanced oil recovery has become a major topic in oil exploration research. After water flooding, about 2 / 3 The oil stays in the capillary pores with thinner or narrower throat diameter, and is in a highly dispersed state. Because the interfacial tension between oil and water is about 30mN / m, it is very difficult to displace this part of oil only by increasing the pressure difference. Because the pressure difference required for driving is 9806.7Kpa, the pressure difference during water injection is only 196.1-392.3Kpa, which is much smaller than the driving pressure difference. [0003] Chemical flooding is the main method of tertiary oil recovery, and surfactant flooding plays ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C08G65/334C08G65/332C08G65/28C07C309/10C07C303/32C07C59/125C07C51/367
CPCC09K8/584
Inventor 沈之芹李应成沙鸥吴国英
Owner CHINA PETROLEUM & CHEM CORP
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