Amphiphilic Janus nano particle and preparation method and application thereof

A nanoparticle and amphiphilic technology, which is applied in the field of amphiphilic Janus nanoparticles and its preparation, can solve the problems of single hydrophilicity, unsatisfactory recovery effect, and poor interfacial activity, so as to reduce the oil-water interfacial tension , excellent oil displacement performance, good interfacial activity and interfacial stability

Inactive Publication Date: 2020-06-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the single hydrophilicity of pure silica nanoparticles, the interfacial activity is not good, resulting in an unsatisfactory effect on enhancing oil recovery.

Method used

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  • Amphiphilic Janus nano particle and preparation method and application thereof
  • Amphiphilic Janus nano particle and preparation method and application thereof
  • Amphiphilic Janus nano particle and preparation method and application thereof

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Embodiment 1

[0036] This embodiment provides a kind of amphiphilic Janus nanoparticle and preparation method thereof, the preparation method of this amphiphilic Janus nanoparticle comprises the following steps, the synthetic route is as follows figure 1 Shown:

[0037] (1) Disperse 1g of pure silica nanoparticles in 99g of deionized water to obtain a dispersion; prepare 10g of liquid paraffin (melting point is around 50-60°C) and add it to the dispersion, heat and stir in a water bath at 65°C (rotating speed is 6000rpm ) 0.5h to form a Pickering emulsion, and obtain small wax balls after cooling in an ice bath and suction filtration (wherein the nanoparticles adhere to the surface of the small wax balls to form half-face protection);

[0038] (2) Add 4 g of silane coupling agent KH550 to the above-mentioned small wax ball obtained by attaching 1 g of silica nanoparticles. After the silane coupling agent KH550 is hydrolyzed by itself for 15 minutes, mix and stir at room temperature for 24 h...

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Abstract

The invention provides an amphiphilic Janus nano particle and a preparation method and application thereof. The preparation method comprises the following steps: dispersing silicon dioxide nanoparticles in water to obtain a dispersion liquid, mixing the dispersion liquid and liquid paraffin, heating and stirring in a water bath to form a Pickering emulsion, cooling to obtain small wax balls, adding a silane coupling agent into the small wax balls for modification to obtain modified small wax balls, mixing the modified small wax balls, an amidation catalyst and C12-C18 saturated fatty acid, andcarrying out an amidation reaction process to obtain organic hydrophobic chain grafted oil-water amphiphilic nanoparticles, and removing paraffin in the organic hydrophobic chain grafted oil-water amphiphilic nanoparticles to obtain the amphiphilic Janus nano particles. When the surfactant is used as an oil-displacing agent, oil-water interfacial tension can be effectively reduced at low concentration, rock wettability is changed, oil-displacing efficiency of nanofluid is remarkably improved, economic cost is reduced, and the surfactant has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, and in particular relates to an amphiphilic Janus nanoparticle and a preparation method and application thereof. Background technique [0002] Nanofluids, as a new type of low-cost and environmentally friendly oil displacement agent for enhanced oil recovery, have been extensively studied in recent years, especially SiO 2 、TiO 2 , Fe 3 o 4 Nanoparticles as oil displacement system research, nano-SiO 2 The study of fluids in enhancing oil recovery has been widely reported. Hydrophilic nano-silica is used as the dispersed phase to prepare nano-silica fluid, which can improve oil recovery by changing the wettability of the rock core, generating separation pressure, reducing pressure and increasing injection. However, due to the single hydrophilicity of pure silica nanoparticles, the interfacial activity is not good, resulting in an unsatisfactory effect on enhancing oil recovery. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 吴海荣高凯苟聪博罗应林康万利侯吉瑞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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