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Temperature-resistant and salt-resistant biopolymer oil displacement agent and preparation method thereof

A technology of biopolymers and oil displacement agents, applied in drilling compositions, chemical instruments and methods, etc., to achieve environmental friendliness and pollution-free, excellent temperature and salt resistance, and improve the effect of temperature and salt resistance

Active Publication Date: 2021-02-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanocellulose can be used directly as an oil displacement agent, but it still cannot resist the weakening of its performance by high temperature and high salt environment

Method used

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  • Temperature-resistant and salt-resistant biopolymer oil displacement agent and preparation method thereof
  • Temperature-resistant and salt-resistant biopolymer oil displacement agent and preparation method thereof
  • Temperature-resistant and salt-resistant biopolymer oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a temperature-resistant and salt-resistant biopolymer oil displacement agent, comprising the steps of:

[0035] (1) Stir and disperse 3g nanocellulose in 300mL deionized water, then add 0.124g TEMPO (2,2,6,6-tetramethylpiperidine oxide), 6.35g sodium bromide, 60mL mass fraction is 8% sodium hypochlorite solution, adjust the pH of the solution to 10, and react at room temperature for 10 h. The oxidized nanocellulose was obtained by washing with a large amount of deionized water, dialysis and centrifugation.

[0036] (2) Disperse 2g T-CNF in 200mL deionized water, adjust the pH to 4.5, add 0.172g EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride) and stir After 15 minutes, add 0.068g of NHS (N-hydroxysuccinimide) and stir for 15 minutes to adjust the pH of the solution to 8-8.5, then add 0.01g of aniline to maintain the pH of the solution at 8-8.5, and stir at room temperature for 24 hours. The benzene ring hydrophobized nanocellulos...

Embodiment 2

[0044] On the basis of Example 1, the steps different from Example 1 are: TEMPO (2,2,6,6-tetramethylpiperidine oxide) addition 0.372g, sodium bromide addition 12.7g, sodium hypochlorite solution The amount added is 60mL, and the reaction time is 16h.

Embodiment 3

[0046] On the basis of Example 2, the steps different from Example 2 are: the addition of EDC (1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride) is 0.516g, stirring The time is 30 min, the amount of NHS (N-hydroxysuccinimide) added is 0.204 g, the stirring time is 30 min, and the amount of aniline added is 0.03 g.

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Abstract

The invention relates to the technical field of oilfield chemistry, particularly to a temperature-resistant and salt-resistant biopolymer oil displacement agent and a preparation method thereof, wherein the molecular structure of the zwitterionic nanocellulose is shown in the specification. According to the invention, the zwitterionic nanocellulose can be used as an oil displacement agent under the condition of high-temperature and high-salinity oil reservoirs, shows excellent temperature resistance and salt resistance, has viscosity retention rate of greater than 70% after high-salinity high-temperature aging, and is excellent in tackifying effect; According to the zwitterionic nanocellulose, benzene ring hydrophobic groups are added, so that the zwitterionic nanocellulose has the temperature-resistant and salt-resistant effects of a hydrophobic association polymer so as to further improve the temperature-resistant and salt-resistant properties of the zwitterionic nanocellulose; and the zwitterionic nanocellulose can effectively improve the crude oil recovery ratio by 21.5% or above under the high-salinity and high-temperature condition, can effectively improve the crude oil recovery ratio, and is environmentally friendly and free of pollution.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a temperature-resistant and salt-resistant biopolymer oil displacement agent and a preparation method thereof. Background technique [0002] At present, chemical flooding is one of the main technical measures to enhance oil recovery in tertiary oil recovery. Chemical flooding includes alkali flooding, surfactant flooding, polymer flooding and composite flooding. The polymer in it is one of the key chemical agents to implement the chemical flooding technology. It is required that the polymer can increase the viscosity of the displacement fluid, reduce the viscosity difference between the displacement fluid and crude oil, and improve the sweep coefficient of the displacement fluid, so as to achieve the purpose of enhancing oil recovery. At present, tertiary oil recovery technologies such as polymer flooding and composite flooding have been widely used in major oil fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/06C08B15/02C09K8/584C09K8/588
CPCC08B15/06C08B15/02C09K8/584C09K8/588C09K2208/10
Inventor 袁杰刘德新李健康贾寒崔洁唐洪涛黄攀
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)