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Preparation of surfactant of double long-chain alkyl lycine and applications thereof

A surfactant and double long-chain alkyl technology, applied in the field of colloid and interface chemistry, can solve the problems of oil well scrapping, oil well scaling, capillary channel blockage, etc., and achieve the effect of enhancing oil recovery

Inactive Publication Date: 2009-10-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some mine field tests in recent years have gradually exposed the defects of ASP flooding, the most important of which is that alkali may react with minerals in rock or formation water to generate insoluble substances, resulting in scaling of oil wells and blockage of capillary channels. may even lead to the scrapping of the well

Method used

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  • Preparation of surfactant of double long-chain alkyl lycine and applications thereof
  • Preparation of surfactant of double long-chain alkyl lycine and applications thereof
  • Preparation of surfactant of double long-chain alkyl lycine and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of didecyl methyl betaine: react with didecyl methyl tertiary amine (Feixiang Chemical Co., Ltd. product) and chloroacetic acid in the presence of NaOH, the reaction medium is water, the reaction temperature is 90 ° C, chloroacetic acid / The molar ratio of tertiary amine is (1.1):1, the molar ratio of NaOH:chloroacetic acid is 1:1, the reaction time is 6 hours, and the conversion rate of tertiary amine is 81%. After the reaction, the aqueous phase is separated, and the upper layer is the product, which contains a small amount of unreacted tertiary amine.

[0027] The preparation of didodecyl methyl betaine: react with didodecyl methyl tertiary amine (product of Feixiang Chemical Co., Ltd.) and chloroacetic acid in the presence of NaOH, the reaction medium is water, the reaction temperature is 95 ° C, chlorine The molar ratio of acetic acid / tertiary amine is (1.2):1, the molar ratio of NaOH:chloroacetic acid is 1:1, the reaction time is 7 hours, and the c...

Embodiment 2

[0033] The prepared didecyl methyl betaine is compounded with a sulfonate type anionic surfactant, and the molar fraction of the didecyl methyl betaine is 0.45. The mixed surfactant was dissolved in Daqing formation water containing 1000ppm polyacrylamide, the total surfactant concentration (mass fraction) was 0.01% and 0.3%, respectively, and the interfacial tension with Daqing crude oil was measured at 45°C. Under the condition of no alkali and no addition of electrolyte, the equilibrium interfacial tension can be reduced to 10 -3 mN / m order of magnitude, such as Figure 4 shown.

Embodiment 3

[0035]The prepared didodecanyl methyl betaine is compounded with a sulfonate-type anionic surfactant, and the molar fraction of the didodecyl methyl betaine is 0.35. The mixed surfactant was dissolved in Daqing formation water containing 1000ppm polyacrylamide, the total surfactant concentration (mass fraction) was 0.05% and 0.5%, respectively, and the interfacial tension with Daqing crude oil was measured at 45°C. Under the condition of no alkali and no addition of electrolyte, the equilibrium interfacial tension can be reduced to 10 -3 mN / m order of magnitude, such as Figure 5 shown.

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Abstract

The invention relates to preparation of a surfactant of double long chain alkyl lycine and applications thereof, belonging to the field of colloid and interface chemistry. The surfactant is prepared by reaction of double long-chain alkyl methyl tertiary amine and chloroactic acid and is an ampholytic surfactant t and the number of carbon atoms of the long-chain alkyl is 8 to 18. By being used by combination with other surface active agents, the surfactant is used as an alkali-free oil-displacing agent; wherein the molar fraction of the surface active agent of double-long chain alkyl lycine is 0.10 to 0.60, and can reduce the interfacial tension of Daqing crude oil / formation water interface to 10mN / m order of magnitude under the conditions that the total mass concentration of the active surface agent is 0.01 percent to 0.5 percent, 1000ppm of polyacrylamide is added, alkali is not added and the temperature is 45 DEG C.

Description

technical field [0001] The preparation and application of a double-long-chain alkyl betaine surfactant belongs to the field of colloid and interface chemistry. The double-long-chain alkyl betaine surfactant involved in the invention is prepared by reacting double-long-chain alkyl methyl tertiary amines with chloroacetic acid, and the number of carbon atoms in the long-chain alkyl is 8-18. By compounding with other surfactants, it can be used as an alkali-free oil displacement agent. Under the conditions of 45°C and 0.01%-0.5% mass fraction of total surfactants, the interfacial tension of Daqing crude oil / formation water can be reduced to 10 without adding alkali -3 mN / m order of magnitude. Background technique [0002] With the rapid development of my country's economy and the continuous improvement of people's living standards, my country's crude oil consumption has increased sharply. In 2008, the dependence on foreign crude oil has exceeded 50%. On the other hand, my co...

Claims

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Application Information

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IPC IPC(8): B01F17/18C09K8/584C09K23/18
Inventor 崔正刚程珊蒋建中王峰张天林
Owner JIANGNAN UNIV
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