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Betaine surfactant, preparation method and application in strengthened oil production

A surfactant and betaine technology, applied in the field of betaine surfactants, can solve the problems of high oil displacement efficiency and low oil displacement efficiency, and achieve enhanced oil recovery, improved salt resistance, wide application prospects and practical significance Effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is the problem of low oil displacement efficiency in surfactants in the prior art under high temperature and high salinity conditions, and a new betaine surfactant is provided, which has Features of high oil displacement efficiency under high salt conditions

Method used

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  • Betaine surfactant, preparation method and application in strengthened oil production
  • Betaine surfactant, preparation method and application in strengthened oil production
  • Betaine surfactant, preparation method and application in strengthened oil production

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Surfactant preparation

[0030] a) Add octadecyl primary amine (1 mol) to a reactor equipped with a condensing device and a stirring device, and when heating to 150°C while blowing nitrogen, add ethylene oxide (2 mol) after heating for 40 minutes, The temperature was maintained at 155°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under 0.06MP vacuum for 1 hour, then blow with nitrogen 4 times to remove the air in the system, and then adjust the reaction temperature of the system Slowly feed ethylene oxide (4 moles) to 165°C, control the pressure ≤ 0.80MPa for alkoxylation reaction until the end of the reaction, neutralize with oxalic acid after cooling, filter and dehydrate to obtain octadecyl polyoxyethylene (n+m=6) ether tertiary amine. Wherein the consumption of barium hydroxide is 0.5wt% of octadecyl primary amine and ethylene oxide weight.

[0031] b) Nitro...

Embodiment 2

[0041] 1. Surfactant preparation

[0042] a) Add octadecyl primary amine (1 mol) to a reactor equipped with a condensing device and a stirring device, and when heating to 150°C while blowing nitrogen, add ethylene oxide (2 mol) after heating for 40 minutes, The temperature was maintained at 155°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under 0.06MP vacuum for 1 hour, then blow with nitrogen 4 times to remove the air in the system, and then adjust the reaction temperature of the system Slowly feed ethylene oxide (1 mole) at 165°C, control the pressure ≤ 0.80MPa to carry out alkoxylation reaction until the end of the reaction, neutralize with oxalic acid after cooling, filter and dehydrate to obtain octadecyl polyoxyethylene (n+m=3) ether tertiary amine. Wherein the consumption of barium hydroxide is 0.5wt% of octadecyl primary amine and ethylene oxide weight.

[0043] ...

Embodiment 3

[0048] 1. Surfactant preparation

[0049] a) Add octadecyl primary amine (1 mol) to a reactor equipped with a condensing device and a stirring device, and when heating to 150°C while blowing nitrogen, add ethylene oxide (2 mol) after heating for 40 minutes, The temperature was maintained at 155°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under 0.06MP vacuum for 1 hour, then blow with nitrogen 4 times to remove the air in the system, and then adjust the reaction temperature of the system Slowly feed ethylene oxide (6 moles) at 165°C, control the pressure ≤ 0.80MPa for alkoxylation until the end of the reaction, neutralize with oxalic acid after cooling, filter, and dehydrate to obtain octadecyl polyoxyethylene (n+m=8) ether tertiary amine. Wherein the consumption of barium hydroxide is 0.5wt% of octadecyl primary amine and ethylene oxide weight.

[0050] b) Add 3-chloro-...

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Abstract

The invention relates to a hydrocarbyl amine polyoxyethylene ether sulfonate type betaine surfactant, a preparation method and application of the surfactant in strengthened oil production of an oilfield. The invention is mainly used for solving the problems that in an existing production technology, the surfactant is used as an oil displacement agent, the oil displacement effect at high temperature and high mineralization degree is poor, and meanwhile, as the surfactant contains alkali, huge harm is caused to a stratum and an oil well, equipment and a conveying pipeline are corroded, environment pollution is caused and the like. By adopting the betaine surfactant with the structure as shown in the following formula (I), wherein R is hydrocarbyl of C8-C40, R1 and R2 are independently selected from alkylene of C1-C4, n+m=2-100 and x=1-100, the problems are better solved, and the surfactant can be used in strengthened oil production of the oilfield.

Description

technical field [0001] The invention relates to a betaine surfactant, a preparation method and an application in enhanced oil recovery. Background technique [0002] Most of my country's oil fields are now in the stage of high water-cut exploitation, and more than 60% of the oil is still "left behind" underground. Moreover, most of the oilfields developed by water flooding have entered the "double high" stage of high water cut and high recovery, and the problem of "multiple wells and low production" is unavoidable. If the remaining underground oil is extracted, it is equivalent to more than doubling the recoverable reserves of our country. Therefore, the development of tertiary oil recovery is the only way for my country's oil extraction. [0003] The so-called tertiary oil recovery is compared with primary oil recovery and secondary oil recovery. In layman's terms, in the initial stage of oil exploitation, only the natural energy of the formation is used to extract oil, ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08G81/00C08G65/26C08G65/28
Inventor 王辉辉沈之芹张慧何秀娟翟晓东
Owner CHINA PETROLEUM & CHEM CORP
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