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N,N-dialkyl propanamide fatty alkyl betaine amphoteric surfactant, preparation method and application thereof in tertiary recovery

A technology of dialkylpropionamide and surfactant, applied in tertiary oil recovery, N,N-dialkylpropionamide fatty alkyl betaine amphoteric surfactant, auxiliary agent field, can solve complex composition, Oil well scrapping, capillary channel blockage and other problems, to achieve good temperature resistance and salt resistance, high interface activity, and low environmental toxicity

Active Publication Date: 2011-10-05
大庆高新区华龙祥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past two decades, ASP flooding (alkali + surfactant + polymer) has been adopted at home and abroad, which can reduce the oil-water interfacial tension to 10 -3 On the order of mN / m, but it has its defects. The most important one is that alkali may react with minerals in rock or formation water to generate insoluble substances, which will lead to scaling of oil wells, blockage of capillary channels, and may even cause oil wells to be scrapped.
Research is needed to replace ASP flooding with surfactant-polymer binary composite flooding. However, cheap surfactants commonly used in ASP flooding, such as petroleum sulfonate, heavy alkylbenzene sulfonate, and natural carboxylate , petroleum carboxylate and lignosulfonate, etc., generally cannot reduce the crude oil / water interfacial tension to ultra-low under alkali-free conditions, and due to the complex composition, performance and quality control are relatively difficult

Method used

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  • N,N-dialkyl propanamide fatty alkyl betaine amphoteric surfactant, preparation method and application thereof in tertiary recovery
  • N,N-dialkyl propanamide fatty alkyl betaine amphoteric surfactant, preparation method and application thereof in tertiary recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The mixture of 62.85 grams of hexadecyl primary amine and octadecyl primary amine is put into four-necked flask, (wherein hexadecyl primary amine accounts for 35wt%, and octadecyl primary amine accounts for 65 wt %), heats up When the temperature reaches 80°C, use a dropping funnel to slowly drop 30 grams of N,N-dimethylacrylamide into it, and finish the reaction after 7 hours to generate N,N-dimethylpropionamide cetearyl secondary amine , Put it in a beaker, heat it a little, keep it in liquid state, and get it when you use it.

[0015] Put 17.12 grams of chloroacetic acid into a four-necked flask, weigh 60. grams of water and divide it into two equal parts, add a portion of 40 grams into the four-necked flask, stir to dissolve the chloroacetic acid, then weigh 7.55 grams of sodium hydroxide, and use the remaining Dissolve 20 grams of water, prepare an aqueous solution, pour it into a four-necked bottle, stir and react for 5 minutes, measure the pH value, make it betwe...

Embodiment 2

[0017] The mixture of 62.85 grams of hexadecyl primary amine and octadecyl primary amine is put into four-necked flask, (wherein hexadecyl primary amine accounts for 35wt%, and octadecyl primary amine accounts for 65wt %), is warming up to At 80°C, use a dropping funnel to slowly drop 30 grams of N,N-dimethylacrylamide into it, and finish the reaction after 7 hours to generate N,N-dimethylpropionamide cetearyl secondary amine. Put it in a beaker, heat it a little, and keep it in a liquid state, and you can get it when you use it.

[0018] Put 35.5 grams of chloropropionic acid into a four-necked flask, weigh 90.09 grams of water and divide it into two equal parts, add a portion of 30 grams into the four-necked flask, stir to dissolve the chloropropionic acid, then weigh 24.5 grams of sodium carbonate, and use the remaining Dissolve 60 grams of water, prepare an aqueous solution, pour it into a four-necked bottle, stir and react for 5 minutes, measure the pH value, make it betw...

Embodiment 3

[0020] Put 48.2 grams of hexadecyl primary amine into a four-necked flask, and when the temperature rises to 70°C, slowly drop 29.7 grams of N,N-dimethylacrylamide into it with a dropping funnel, raise the temperature to 80°C, and react for 5 hours Finally, the reaction is completed to generate N,N-dimethylpropionamide hexadecyl secondary amine, which is put into a beaker and heated slightly to maintain a liquid state for use.

[0021] Put 30.6 grams of chlorobutyric acid into a four-necked flask, weigh 90.06 grams of water and divide it into two equal parts, add a portion of 60 grams into the four-necked flask, stir to dissolve the chlorobutyric acid, then weigh 12 grams of sodium hydroxide, and use Dissolve the remaining 30 grams of water, prepare an aqueous solution, pour it into a four-necked bottle, stir and react for 5 minutes, measure the pH value, make it between 8 and 9, and then weigh 34 grams of N,N-dimethylpropionamide ten times Pour hexaalkyl secondary amine into ...

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Abstract

The invention relates to a N,N-dialkyl propanamide fatty alkyl betaine amphoteric surfactant, a preparation method and an application thereof in tertiary recovery. In a structural formula of the amphoteric surfactant, R1 is any alkyl with a carbon number of 12-18; R2 and R3 are respectively any alkyl with the carbon number of 1-2; and m is the number from 1 to 3. The amphoteric surfactant prepared by using the method is suitable for the tertiary recovery in oil fields. The amphoteric surfactant can be used as an oil-displacing agent for preparing a binary compound oil-displacing system. In the absence of alkali, the amphoteric surfactant has excellent interfacial tension and oil-displacing property. The amphoteric surfactant is compatible with different oily water, so as to achieve an ideal oil-displacing effect.

Description

technical field [0001] The invention relates to an auxiliary agent in the field of oil recovery, in particular to an N,N-dialkylpropionamide fatty alkyl betaine amphoteric surfactant, a preparation method and its application in tertiary oil recovery. Background technique [0002] There are four methods of tertiary oil recovery: one is thermal flooding; the other is miscible flooding; the third is chemical flooding (polymer flooding, surfactant flooding, composite flooding, alkali flooding); the fourth is microbial oil recovery. Surfactant flooding is the most promising application in tertiary oil recovery. Surfactant is the main mechanism of oil displacement is to inject surfactant aqueous solution to reduce the oil-water interfacial tension to 10 -3 On the order of mN / m, the trapped oil droplets can flow out of the porous media under the normal water injection pressure. In the past two decades, ASP flooding (alkali + surfactant + polymer) has been adopted at home and abro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/18B01F17/22C07C237/06C07C231/12C09K8/584C09K23/18C09K23/22
Inventor 孙安顺
Owner 大庆高新区华龙祥化工有限公司
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