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
CN113292978AActive Publication Date: 2021-08-24SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2021-08-24

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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.
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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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