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Temperature-resistant and salt-resistant zwitterionic oil displacement agent, preparation method and application thereof

A zwitterionic, temperature-resistant and salt-resistant technology, which is applied in the field of oil displacement agents in oil fields, can solve problems such as poor temperature resistance, weak salt resistance, and weak oil displacement effect, and achieve outstanding oil displacement effect and strong salt resistance , Excellent effect of high temperature resistance

Inactive Publication Date: 2020-06-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to solve the problems of poor temperature resistance, weak salt resistance and weak oil displacement effect of oil displacement agents in the prior art, the present invention provides a zwitterionic oil displacement agent with temperature resistance and salt resistance. One purpose is to provide the preparation method and application of this temperature-resistant and salt-resistant zwitterionic oil-displacing agent

Method used

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  • Temperature-resistant and salt-resistant zwitterionic oil displacement agent, preparation method and application thereof
  • Temperature-resistant and salt-resistant zwitterionic oil displacement agent, preparation method and application thereof
  • Temperature-resistant and salt-resistant zwitterionic oil displacement agent, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The zwitterionic oil-displacing agent synthesized in this embodiment is dodecyl dimethyl betaine-polyoxyethylene ether-heptadecyl imidazoline, and the structure is as follows:

[0052]

[0053] Where n=8-10.

[0054] resolve resolution:

[0055] Add concentrated sulfuric acid to the reactor (the exact content of the acidic environment is not required, the following examples are the same), the temperature is raised to 150°C, 40g ethylene oxide and 30g heptadecyl imidazoline are added and stirred for 1.5h, and the temperature is reduced to 50°C. Slowly add 20 g of dodecyl dimethyl betaine, continue the reaction for 1.5 hours, cool to room temperature, and add sodium hydroxide to adjust the pH to 7 to prepare the zwitterionic oil-displacing agent of this embodiment.

Embodiment 2

[0057] The zwitterionic oil-displacing agent synthesized in this embodiment is dodecyl dimethyl betaine-polyoxyethylene ether-heptadecyl imidazoline, and the structure is as follows:

[0058]

[0059] Where n=10-12.

[0060] resolve resolution:

[0061] Add concentrated sulfuric acid to the reactor, increase the temperature to 170°C, add 60g ethylene oxide and 40g heptadecyl imidazoline and stir for 1h, cool to 60°C, slowly add 20g dodecyldimethyl betaine, continue the reaction 1.5 h. Cool down to room temperature, add sodium hydroxide to adjust the pH to 7, to prepare the zwitterionic oil-displacing agent of this example.

Embodiment 3

[0063] The zwitterionic oil-displacing agent synthesized in this embodiment is dodecyl dimethyl betaine-polyoxyethylene ether-heptadecyl imidazoline, and the structure is as follows:

[0064]

[0065] Where n=8-10.

[0066] resolve resolution:

[0067] Add concentrated sulfuric acid to the reactor, increase the temperature to 160°C, add 30g ethylene oxide and 20g heptadecyl imidazoline, stir for 1.5h, cool to 60°C, slowly add 20g dodecyl dimethyl betaine, continue the reaction After 1.5 hours, the temperature was lowered to room temperature, and sodium hydroxide was added to adjust the pH value to 7, to prepare the zwitterionic oil-displacing agent of this embodiment.

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Abstract

The invention discloses a temperature-resistant and salt-resistant zwitterionic oil displacement agent, a preparation method and application thereof, wherein the structure of the temperature-resistantand salt-resistant zwitterionic oil displacement agent is represented by a formula (I). According to the method, under an acidic condition, ethylene oxide and heptadecyl imidazoline are subjected toa reaction; the reaction product reacts with alkyl dimethyl betaine, wherein the structure of the alkyl dimethyl betaine is represented by a formula (II); and after the reaction is finished, sodium hydroxide is used for adjusting the pH value of the reaction solution to be neutral to obtain the zwitterionic oil displacement agent. The oil displacement agent provided by the invention is suitable for high-temperature and high-salinity oil fields, and has the characteristics of strong salt resistance, excellent high-temperature resistance and outstanding oil-displacing effect.

Description

Technical field [0001] The invention relates to an oil-displacing agent for oil fields, in particular to a temperature-resistant and salt-resistant zwitterionic oil-displacing agent, and a preparation method and application thereof. Background technique [0002] As the most important means of tertiary oil recovery, chemical oil-displacing agents have been widely used in the field of oilfield flooding. The most widely used chemical oil-displacing agents are mainly sulfonate anionic oil-displacing agents. The sensitivity of ions is high, and it is easy to lose efficacy in high salinity water (when the salinity is greater than 20,000, the use effect is basically lost). The above-mentioned shortcomings seriously affect the application of chemical oil displacement agents in high salinity oil fields and the efficiency of tertiary oil recovery. [0003] In this regard, people have chosen betaine-based zwitterionic oil-displacing agents as substitutes for sulfonate-based anionic oil-displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C07D233/02C07C229/12C07C227/18C08G65/333C08G65/26
CPCC09K8/584C07D233/02C07C229/12C08G65/333C08G65/263
Inventor 沈健付磊莫宏章峻赵越何磊王达炜周宁琳蒋雪峰
Owner NANJING NORMAL UNIVERSITY
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