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Carboxylate surface active agent, its formula system and its application in tertiary oil extraction

A surfactant and carboxylate technology, applied in the formulation system and its application in tertiary oil recovery, can solve problems such as formation and oil well damage, and achieve the effects of easy biodegradation, overcoming huge damage, and excellent oil displacement effect.

Inactive Publication Date: 2006-02-08
DAQING GASOLINEEUM INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing ASP flooding system contains a high concentration of alkali, such as sodium hydroxide, sodium carbonate, etc., which will cause great damage to the formation and oil wells during use, so there is an urgent need for a A new type of oil displacement system, in the absence of alkali, can still form 10 -3 ~10 -4 Ultra-low interfacial tension of mN / m, enhance oil recovery by more than 20% (OOIP)

Method used

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  • Carboxylate surface active agent, its formula system and its application in tertiary oil extraction
  • Carboxylate surface active agent, its formula system and its application in tertiary oil extraction

Examples

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Effect test

Embodiment 1

[0039] Embodiment one: the synthesis of potassium phenyl octadecanoate

[0040] Add 234g of benzene and 60g of concentrated sulfuric acid into a 1000ml three-necked flask equipped with a condenser and a stirrer, heat up to 80°C with stirring, then start to drop 282g of oleic acid, and continue the reaction for 12 hours after the dropwise addition is complete. The concentrated sulfuric acid was removed by washing with cooling water, and phenyl octadecanoic acid was obtained by distillation under reduced pressure. Take 10 g of phenyl octadecanoic acid, 2 g of potassium hydroxide, and 88 g of water into a 500 ml three-necked flask, and saponify at 100° C. for 2 hours to obtain potassium phenyl octadecanoate.

Embodiment 2

[0041] Example two Potassium phenoxy octadecanoate

[0042] Add 160g phenol in the 1000ml there-necked flask equipped with stirrer, 200ml benzene, 68g sodium hydroxide, 120g water and phase transfer catalyst tetrabutylammonium bromide 2g, 80 ℃ of reaction 1 hour, make sodium phenolate solution, prepare Use later.

[0043] Add 300ml of ether and 282g of oleic acid into a 1000ml three-neck flask equipped with a stirrer, cool it down to about 0°C, and pass through dry hydrobromic acid, the hydrobromic acid is 1.5mol, and continue at this temperature after passing through. React for 14 hours. Heating to remove the solvent ether and excess hydrobromic acid, and distillation under reduced pressure to obtain the pure intermediate bromooctadecanoic acid. Take 281g of bromooctadecanoic acid and put it into a three-necked flask, raise the temperature to 110°C, then add dropwise the sodium phenoxide solution prepared above for 30 minutes, continue to react for 4 hours after dropping, c...

Embodiment 3

[0044] Embodiment three The synthesis of a kind of carboxylate surfactant formulation system

[0045] Take 0.3 g of potassium phenyl octadecanoate, 0.25 g of polyacrylamide, 0.5 g of sodium chloride, and 98.65 g of water, and stir for 30 minutes to obtain a carboxylate surfactant formulation system.

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Abstract

The invention relates to a carboxylate surfactant made by unsaturated fatty acid, a prescription containing carboxylate surfactant and its usage in teritary oil extraction. The prescription can be also added with adjuvant, salt, polymer and water. The prescription containing carboxylate surfactant can achieve ultralow interfacial tension of 10-3-10-5mN / m with crude oil underground, drive remaining oil in oil layer efficiently and increase recovery coefficient by more than 25%.

Description

technical field [0001] The invention relates to a carboxylate surfactant synthesized from unsaturated fatty acid, a formulation system containing the carboxylate surfactant and its application in tertiary oil recovery. Background technique [0002] The application of surfactants in oil recovery technology began in the early 1930s and has a history of more than 70 years. Over the past 70 years, great progress has been made in both theory and practice. At present, the following injection systems have basically been formed. (1) active water flooding, (2) micellar solution flooding, (3) low interfacial tension system flooding, (4) ASP flooding. Among them, ASP flooding (alkali-polymer-surfactant) is a new method of enhancing oil recovery developed in the 1980s. High oil displacement efficiency can still be obtained, therefore, it has become a new technology for enhancing oil recovery that is economically and technically successful. [0003] After the oi...

Claims

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Application Information

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IPC IPC(8): B01F17/00C09K23/00
Inventor 刘春德王德民王彦伟张宝弘
Owner DAQING GASOLINEEUM INST
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