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Fatty alcohol polyoxypropylene ether sulfobetaine and alkali-free composite oil displacement composition

A technology of alcohol polyoxypropylene ether and sulfobetaine, which is applied in the directions of drilling composition, sulfonate preparation, chemical instrument and method, etc., can solve problems affecting the normal use of medium and low temperature oil reservoirs and high production cost of betaine , the problem of high price of long-chain tertiary amines, to achieve the effect of improving the balance of hydrophilic and lipophilic, improving interface properties and salt resistance, and reducing production costs

Active Publication Date: 2016-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the research and application of sulfobetaine surfactants for non-alkali binary flooding, it was found that the price of long-chain tertiary amines used in long-chain sulfobetaine is relatively high, which makes the production cost of product betaine high, and the long-chain Due to the large carbon number of the hydrophobic group, the Krafft point is too high and the solubility of sulfobetaine is poor, which affects the normal use in medium and low temperature oil reservoirs

Method used

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  • Fatty alcohol polyoxypropylene ether sulfobetaine and alkali-free composite oil displacement composition
  • Fatty alcohol polyoxypropylene ether sulfobetaine and alkali-free composite oil displacement composition
  • Fatty alcohol polyoxypropylene ether sulfobetaine and alkali-free composite oil displacement composition

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1N-[octadecyl polyoxypropylene ether (2)-2-hydroxypropyl]-N,N-dimethyl hydroxypropyl sulfobetaine

[0034] This example provides a kind of N-[octadecyl polyoxypropylene ether (2)-2-hydroxypropyl]-N,N-dimethyl hydroxypropyl sulfobetaine, which is synthesized by the following steps:

[0035](1) Etherification reaction: Add 0.1mol n-octadecylpolyoxypropylene ether (2), 1.7g tetrabutylammonium bromide, 8.0g solid NaOH, add n-hexane as a solvent, heat up to 65°C, add 10.2g of epichlorohydrin dropwise to react at constant temperature for 3 hours, then wash with water until neutral.

[0036] (2) amination reaction: in the there-necked flask equipped with electromagnetic stirring, thermometer, reflux condenser and drying tube, add the product of 0.05mol above-mentioned etherification reaction, 10.0g mass fraction is the dimethylamine aqueous solution of 30-33%, Ethanol was added as a solvent, the reaction was stirred at 65°C for 1 h, and the ethanol was removed by r...

Embodiment 2

[0038] Embodiment 2N-[jubet alkyl polyoxypropylene ether (3)-2-hydroxypropyl]-N,N-dimethyl hydroxypropyl sulfobetaine

[0039] This example provides a kind of N-[jubet alkyl polyoxypropylene ether (3)-2-hydroxypropyl]-N,N-dimethyl hydroxypropyl sulfobetaine, which is synthesized by the following steps:

[0040] (1) etherification reaction: add 0.10mol2-octyl-dodecylpolyoxypropylene ether (3), 1.7g tetrabutylammonium bromide, Add 8.0g of solid NaOH, add n-hexane as solvent, heat up to 80°C, add dropwise 10.2g of epichlorohydrin to react at constant temperature for 4 hours, then wash with water until neutral.

[0041] (2) amination reaction: in the there-necked flask equipped with electromagnetic stirring, thermometer, reflux condenser and drying tube, add the product of 0.05mol above-mentioned etherification reaction, 10.0g mass fraction is the dimethylamine aqueous solution of 30-33%, Ethanol was added as a solvent, the reaction was stirred at 75°C for 1 h, and the ethanol wa...

Embodiment 3

[0043] Example 3N-[tetradecyl polyoxypropylene ether (12)-2-hydroxypropyl]-N,N-dimethylpropanesulfobetaine

[0044] This example provides a kind of N-[tetradecyl polyoxypropylene ether (12)-2-hydroxypropyl]-N,N-dimethylpropane sulfobetaine, which is synthesized by the following steps:

[0045] (1) Etherification reaction: Add 0.1mol tetradecyl polyoxypropylene ether (12), 1.7g tetrabutylammonium bromide, and 8.0g solid NaOH to a three-necked flask equipped with electric stirring, a thermometer and a reflux condenser , add n-hexane as a solvent, heat up to 80°C, add 10.2g of epichlorohydrin dropwise and react at constant temperature for 4 hours, then wash with water until neutral.

[0046] (2) amination reaction: in the there-necked flask equipped with electromagnetic stirring, thermometer, reflux condenser and drying tube, add the product of 0.05mol above-mentioned etherification reaction, 10.0g mass fraction is the dimethylamine aqueous solution of 30-33%, Ethanol was added ...

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Abstract

The invention relates to a fatty alcohol polyoxypropylene ether sulphobetaine and an alkali-free composite combination for displacing oil. The fatty alcohol polyoxypropylene ether sulphobetaine is one or the combination of several compounds as the formula I shown in specification, wherein R is any one of linear alkyl, branched alkyl, Guerbet-structure alkyl and aryl alkyl; the linear alkyl is C4-C24 alkyl; the branched alkyl is C6-C30 alkyl; the Guerbet-structure alkyl is C6-C30 Guerbet-structure alkyl; the aryl alkyl is 9-cresyl-octadecyl and 9-dimethyl phenyl-octadecyl; R' is any one of the structures as shown in the specification; n is any integer of 0-20. The invention also provides an alkali-free composite combination for displacing oil, which comprises the fatty alcohol polyoxypropylene ether sulphobetaine. Without adding alkali, medium-and low-temperature medium-and low-salt oil reservoir and high-temperature high-salt oil reservoir can reach a magnitude of 10-3mN / m by the fatty alcohol polyoxypropylene ether sulphobetaine.

Description

technical field [0001] The invention relates to a fatty alcohol polyoxypropylene ether sulfobetaine and its application in tertiary oil recovery, belonging to the technical field of oil recovery. Background technique [0002] ASP flooding is an enhanced oil recovery technology developed in the 1980s. It is a ternary system composed of alkali, surfactant and polymer. The polymer can control the mobility and improve the mobility ratio. The effect of improving the swept volume, the compounding of surfactant and alkali can greatly reduce the interfacial tension of oil and water, and improve the oil displacement efficiency. Laboratory research and field application results show that ASP flooding technology can greatly increase the recovery rate of high water-cut oilfields and achieve stable crude oil production. [0003] As oil extraction continues, for oil fields that have entered the middle and late stages of water flooding, the remaining crude oil is trapped in the pores of r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/14C07C303/32C09K8/584C08G65/00
Inventor 蔡红岩王强张翼张帆张群
Owner PETROCHINA CO LTD
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