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Temperature-resistant salt-resistant low-tension foam oil-displacing agent as well as preparation method and application thereof

A foam flooding, temperature-resistant and salt-resistant technology, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc. Improve foaming ability and highlight the effect of foam performance

Active Publication Date: 2021-06-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In high vacuum operation, acid mist is carried in the steamed water, causing corrosion to the pipeline
[0004] However, compared with the anionic surfactants commonly used in oil field tertiary oil recovery, the price of anion-nonionic fatty alcohol polyoxyethylene ether carboxylate is on the high side, and the amount of tertiary oil recovery in oil fields is large, which increases the production cost

Method used

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  • Temperature-resistant salt-resistant low-tension foam oil-displacing agent as well as preparation method and application thereof
  • Temperature-resistant salt-resistant low-tension foam oil-displacing agent as well as preparation method and application thereof
  • Temperature-resistant salt-resistant low-tension foam oil-displacing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1) Alkalization reaction of lauryl alcohol polyoxyethylene ether (3):

[0064] Add 318g (1mol) lauryl alcohol polyoxyethylene ether (3) into the reaction kettle with heating, temperature control and electric stirring device, heat up to about 70°C, and use a screw feeder to feed 120g (3.0 mol) solid sodium hydroxide is slowly added to the reaction kettle, after the addition is completed, the temperature is raised to about 75°C, and the reaction is continued for about 2 hours at this temperature;

[0065] 2) carboxymethylation reaction:

[0066] The temperature of the reactant system in the reaction kettle after alkalization in step 1) is lowered to about 55° C., and 141.8 g (1.5 mol) of solid chloroacetic acid is slowly added to the reaction kettle with a screw feeder under constant stirring. After the feeding is completed, Heating to about 80°C, and continuing the constant temperature reaction for about 4 hours to obtain a heat-resistant, salt-resistant, low-tension fo...

Embodiment 2

[0071] 1) Alkalization reaction of tetradecyl alcohol polyoxyethylene ether (3):

[0072] Add 346g (1mol) tetradecyl alcohol polyoxyethylene ether (3) into the reaction kettle with heating, temperature control and electric stirring device, heat up to about 70°C, and use a screw feeder to feed 112g (2.8 mol) solid sodium hydroxide is slowly added to the reaction kettle, after the feeding is completed, the temperature is raised to about 75°C, and the reaction is continued at this temperature for 1 to 2 hours;

[0073] 2) carboxymethylation reaction:

[0074] The temperature of the reactant system in the reaction kettle after alkalization in step 1) is lowered to about 55°C, and 132.3g (1.4mol) of solid chloroacetic acid is slowly added to the reaction kettle with a screw feeder under constant stirring. After the feeding is completed, Heating to about 85°C, and continuing the constant temperature reaction for 2 to 5 hours to obtain a heat-resistant, salt-resistant, low-tension f...

Embodiment 3

[0077] 1) Alkalization reaction of tetradecyl alcohol polyoxyethylene ether (4):

[0078] Add 390g (1mol) tetradecyl alcohol polyoxyethylene ether into the reaction kettle with heating, temperature control and electric stirring device, (4) heat up to about 70°C, and use a screw feeder to feed 112g (2.8 mol) solid sodium hydroxide is slowly added to the reaction kettle, after the feeding is completed, the temperature is raised to about 75°C, and the reaction is continued at this temperature for 1 to 2 hours;

[0079] 2) carboxymethylation reaction:

[0080] The temperature of the reactant system in the reaction kettle after alkalization in step 1) is lowered to about 55°C, and 132.3g (1.4mol) of solid chloroacetic acid is slowly added to the reaction kettle with a screw feeder under constant stirring. After the feeding is completed, Heating to about 85°C, and continuing the constant temperature reaction for 3 to 4 hours to obtain a heat-resistant, salt-resistant, low-tension f...

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Abstract

The invention discloses a temperature-resistant salt-resistant low-tension foam oil-displacing agent. The foam oil-displacing agent mainly comprises fatty alcohol polyoxyethylene ether carboxylate, and also comprises fatty alcohol-polyoxyethylene ether. The product has excellent oil-water interface property and outstanding foam performance, and is especially suitable for a foam flooding technology in the field of tertiary oil recovery. The invention also discloses a preparation method of the foam oil-displacing agent, the whole synthesis process of the method is continuously completed in a reaction kettle, any additional separation and purification process is not needed, a terminal product is directly formed, and the method has the advantages of simple process, economy, environmental friendliness and the like. The invention also discloses application of the foam oil-displacing agent.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery. More specifically, it relates to a temperature-resistant and salt-resistant low-tension foam oil displacement agent and its preparation method and application. Background technique [0002] In oil and gas field development engineering, using surfactant to drive oil is an important method to enhance oil recovery. However, in high temperature and high water salinity reservoirs, neither anionic nor nonionic surfactant alone can meet the requirements of oil displacement. Because the anionic surfactant itself is not salt-tolerant, the excessive mineralization of the formation water will cause the precipitation of the surfactant. Non-ionic surfactants have a cloud point, and the formation temperature is higher than the cloud point, which will also cause surfactant precipitation. [0003] In some prior art there is a carboxymethylation process to produce high grade ether carboxylates. In the car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22C07C59/125C07C51/41
CPCC09K8/584E21B43/16C07C51/41C07C41/26C07C59/125C07C43/11
Inventor 徐志成宫清涛靳志强刘子瑜张磊罗澜张路赵濉
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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