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Preparation method of long-chain fatty alcohol-polyoxyethyleneether sulfate and amphoteric surfactant as well as application thereof in tertiary oil recovery

A technology of alcohol polyoxyethylene ether and surfactant, which is applied in the compounding of long-chain fatty alcohol polyoxyethylene ether sulfate and amphoteric surfactant and its application in tertiary oil recovery, which can solve the problem of low salinity and other problems, to achieve the effect of good biodegradability, good compatibility, and simple synthesis conditions

Inactive Publication Date: 2013-03-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they all have a common defect, that is, they are only suitable for low salinity and Ca 2+ , Mg 2+ Reservoir geological conditions not exceeding 500mg / L

Method used

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  • Preparation method of long-chain fatty alcohol-polyoxyethyleneether sulfate and amphoteric surfactant as well as application thereof in tertiary oil recovery
  • Preparation method of long-chain fatty alcohol-polyoxyethyleneether sulfate and amphoteric surfactant as well as application thereof in tertiary oil recovery
  • Preparation method of long-chain fatty alcohol-polyoxyethyleneether sulfate and amphoteric surfactant as well as application thereof in tertiary oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Add a certain amount of long-chain fatty alcohol polyoxyethylene ether into a 250mL three-necked flask, raise the temperature to 60°C and start stirring, then slowly add ClSO 3 H, the reaction dosage is n (long-chain fatty alcohol ether): n (ClSO 3 H)=1:1.05, the feeding time is about 1h, the HCl generated by the reaction is absorbed through the absorption bottle equipped with lye, the feeding is completed, and the reaction is continued for 20 minutes. After the reaction, the neutralization value and long-chain The content of fatty alcohol polyoxyethylene ether sulfate ester, according to the neutralization value of measuring, calculates the amount of adding alkali, drops 15% sodium hydroxide (triethanolamine) solution, and molar ratio is 1: 1~1: 3, stirs, heats, Control the reaction temperature at 70°C, adjust the pH value to 8-10, finish the reaction, vacuum-dry the product to remove water, then dissolve it with a large amount of ethanol to remove inorganic salts, and ...

Embodiment 2

[0040] Add a certain amount of long-chain fatty alcohol polyoxyethylene ether into a 250mL three-necked flask, raise the temperature to 60°C and start stirring, then slowly add ClSO 3 H, the reaction dosage is n (long-chain fatty alcohol ether): n (ClSO 3 H)=1:1.1, the feeding time is about 1h, the HCl generated by the reaction is absorbed through the absorption bottle equipped with lye, the feeding is completed, and the reaction is continued for 30 minutes. After the reaction, the neutralization value and long-chain The content of fatty alcohol polyoxyethylene ether sulfate ester, according to the neutralization value of measuring, calculates the amount of adding alkali, drops 10% sodium hydroxide (triethanolamine) solution, and molar ratio is 1: 1~1: 3, stirs, heats, Control the reaction temperature at 70°C, adjust the pH value to 9-10, finish the reaction, vacuum-dry the product to remove water, then dissolve it with a large amount of ethanol to remove inorganic salts, and ...

Embodiment 3

[0042] Add a certain amount of long-chain fatty alcohol polyoxyethylene ether into a 250mL three-necked flask, raise the temperature to 70°C and start stirring, then slowly add ClSO 3 H, the reaction dosage is n (long-chain fatty alcohol ether): n (ClSO 3 H)=1:1, the feeding time is about 1h, the HCl generated by the reaction is absorbed through the absorption bottle equipped with lye, the feeding is completed, and the reaction is continued for 50min. After the reaction, the neutralization value and long-chain The content of fatty alcohol polyoxyethylene ether sulfate ester, according to the neutralization value of measuring, calculates the amount of adding alkali, drops 5% sodium hydroxide (triethanolamine) solution, and molar ratio is 1: 1~1: 3, stirs, heats, Control the reaction temperature at 80°C, adjust the pH value to 9-10, finish the reaction, vacuum-dry the product to remove water, then dissolve it with a large amount of ethanol to remove the inorganic salt, and obtai...

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Abstract

The invention discloses a preparation method of long-chain fatty alcohol-polyoxyethyleneether sulfate and amphoteric surfactant as well as an application thereof in tertiary oil recovery. According to the special scheme, long-chain fatty alcohol ether, chlorosulfonic acid and sodium hydroxide are used as main raw materials, and are subjected to sulfonation and neutralization reactions to synthesize a nonionic-anion surfactant. The preparation method has the advantages of simple process, low cost of the raw materials, wide sources, stable product property, environmental friendliness and economical benefits. An oxethyl group is embedded into the long alkyl chain of the anion surfactant, so that the surface activity is high, the thermal stability and the anti-salt capability are good, the compatibility is good and the biodegradation property is good. The preparation method of an oil-displacing agent and the other surfactants provided by the invention has very good coordination effect and is used for preparing the efficient oil-displacing agent in the tertiary oil recovery, so that the ultralow interface tension can be formed on a water-raw oil interface. Furthermore, the interface tension is not influenced by temperature, mineralization degree and calcium-magnesium ion concentration.

Description

technical field [0001] The invention relates to the compounding of long-chain fatty alcohol polyoxyethylene ether sulfate and amphoteric surfactant and its application in tertiary oil recovery. Background technique [0002] The biggest feature of nonionic-anionic surfactants is their strong resistance to salt. In addition, for formation water with different salt content, the hydrophilic-lipophilic balance of the surfactant can be adjusted by adjusting the size of the oxyethylene chain unit in the alkoxy surfactant molecule. Therefore, as oil displacement agents, nonionic-anionic surfactants show greater advantages than sulfonate surfactants and carboxylate surfactants. Dahanyak et al prepared a fatty alcohol ether sulfonate containing an ethoxy group and studied its surface activity, while alcohol ether sulfonate surfactants with multiple ethoxy groups can be used for high salt content, high temperature underground rock formations Tertiary oil recovery. Wang Yefei et al. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/02B01F17/42C09K8/584C09K23/02C09K23/42
Inventor 许虎君宋春丽罗强章
Owner JIANGNAN UNIV
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