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Amphoteric two-dimensional nanosheet as well as preparation method and application thereof

A two-dimensional nano and amphoteric technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as difficult to meet the requirements of oil displacement operations, the influence of reservoir heterogeneity, and low microscopic oil displacement efficiency. To facilitate large-scale production, improve the displacement effect, and expand the swept volume of water flooding

Active Publication Date: 2021-08-24
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, water flooding reservoirs often have problems such as large water-oil viscosity difference, high mobility ratio, and being easily affected by reservoir heterogeneity, so that the displacement front forms viscous fingering and reduces the sweep efficiency. In addition, Water flooding reservoirs also have the characteristics of high oil / water interfacial tension, high oil / rock interfacial energy (strong oil wettability), large oil adhesion work, and low microscopic oil displacement efficiency in water-swept areas. Conventional water flooding development methods have been difficult to Meet the requirements of oil displacement operations under complex conditions; at the same time, domestic water flooding development oilfields have entered the middle and late stages of development, showing the characteristics of "double high" of high water cut and high recovery degree. The average recovery degree of the oilfield is only 32%, about 2 / 3 of the underground crude oil reserves are difficult to recover by using the current water flooding technology, so it is urgent to develop new technologies to effectively enhance oil recovery to maintain a stable increase in crude oil production

Method used

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  • Amphoteric two-dimensional nanosheet as well as preparation method and application thereof
  • Amphoteric two-dimensional nanosheet as well as preparation method and application thereof
  • Amphoteric two-dimensional nanosheet as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add 6g of oligolayer graphite oxide into a 500mL three-necked bottle with a layer thickness of 20nm, then add 40g of toluene, stir in a water bath at 65°C for 60min to ensure that the oligolayer graphite oxide is fully dispersed, and ultrasonicate for 30min; The coupling agent N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane was added to the three-necked bottle dispersed with oligolayer graphite oxide, sealed and stirred, and the combined reaction was carried out in a water bath at 80°C for 4h , suction filtration, purification, and drying to obtain an amino-terminated graphene oxide dispersion;

[0034] Then add 3g of the prepared amine-terminated graphene oxide dispersion in a 500mL three-necked bottle, then add 20g of toluene and dimethylformamide solvent (weight and number ratio 1:1), and stir in a water bath at 80°C 60min; Add 1.2g of tert-butylphenyl glycidyl ether into the three-necked bottle of graphene oxide dispersion dispersed with amine groups at 65°C in ...

Embodiment 2

[0036] Add 8g of oligolayer graphite oxide into a 500mL three-neck flask with a layer thickness of 150nm, then add 50g of toluene, stir in a water bath at 70°C for 60min to ensure that the oligolayer graphite oxide is fully dispersed, and ultrasonicate for 30min; The coupling agent γ-aminopropyltriethoxysilane was added to a three-necked bottle dispersed with oligolayer graphite oxide, sealed and stirred, and combined reaction was carried out in a water bath at 70°C for 4.5 hours, then suction filtered, purified, and dried to obtain an amino-sealed bottle. terminal graphene oxide dispersion;

[0037] Then add 3.5g of the prepared amine-terminated graphene oxide dispersion in a 500mL three-necked bottle, then add 20g of toluene and dimethylformamide solvent (ratio of parts by weight 1:1.2), in a water bath at 80°C Stir for 60 minutes; add 1.5 g of butyl glycidyl ether into a three-necked bottle of graphene oxide dispersion dispersed with amino groups at 80°C in a water bath, se...

Embodiment 3

[0039]Add 9g of oligolayer graphite oxide into a 500mL three-necked bottle with a layer thickness of 400nm, then add 60g of toluene, stir in a water bath at 75°C for 60min to ensure that the oligolayer graphite oxide is fully dispersed, and ultrasonicate for 30min; The coupling agent N-2-(aminoethyl)-3-aminopropyltrimethoxysilane was added to the three-necked bottle dispersed with oligolayer graphite oxide, sealed and stirred, and the combined reaction was carried out in a water bath at 75°C for 5h, and suction filtered , purifying, and drying to obtain an amino-terminated graphene oxide dispersion;

[0040] Then add 4g of the prepared amine-terminated graphene oxide dispersion in a 500mL three-necked bottle, then add 30g of toluene and dimethylformamide solvent (ratio of parts by weight 1:1.3), and stir in a water bath at 85°C 60min; Add 1.8g of octyl glycidyl ether into the three-necked bottle of graphene oxide dispersion dispersed with amino groups at 85°C in a water bath, ...

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Abstract

The invention discloses an amphoteric two-dimensional nanosheet as well as a preparation method and application thereof. The amphoteric two-dimensional nanosheet is prepared through the following steps: evenly dispersing few-layer graphite oxide in methylbenzene, and adding an alkylamine coupling agent into the methylbenzene for a reaction; and then fully dispersing the prepared amido-terminated graphene oxide dispersion in a toluene-dimethylformamide mixed solvent, and then adding alkyl glycidyl ether into the dispersion to react, so as to obtain the amphoteric two-dimensional nanosheet. The amphoteric two-dimensional nanosheet is prepared by modifying two-dimensional graphene oxide, compared with an emulsion composed of a conventional surfactant, the amphoteric two-dimensional nanosheet can spontaneously form a water-in-oil Pickering emulsion at an oil-water interface, effectively stabilize the water flooding front edge and enlarge the water flooding swept volume, the synthesis process is simple and convenient, large-scale production is facilitated, and the amphoteric two-dimensional nanosheet has a wide application range, and is generally suitable for water-flooding exploitation of oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to an amphoteric two-dimensional nanosheet and its preparation method and application. Background technique [0002] Since the 1890s, China has become a net importer of oil in order to meet its development needs. From 2008 to 2020, China's dependence on foreign oil has increased from 47% to 73%. It is estimated that by 2030, China will face a huge oil shortage. Therefore, accelerating the exploration and development of oil resources, increasing oil production, alleviating the contradiction between China's oil supply and demand, and ensuring national energy security have become urgent problems in the industry. Water flooding reservoirs will be the main part of crude oil production in my country now and for a long time in the future. According to theoretical calculations, every 1% increase in the efficiency of water flooding development will increase the recoverable reserve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/58C09K8/584C09K8/032B82Y30/00C01B32/198B82Y40/00C01P2004/24C01P2006/90
Inventor 刘锐高石蒲万芬赵星孙琳杜代军徐莹雪
Owner SOUTHWEST PETROLEUM UNIV
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