Surface cationized silicon dioxide nanoparticles

A silicon dioxide, cationization technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology for materials and surface science, etc., can solve the problems of limited foam stability and achieve improved adaptability and good temperature resistance Effect

Inactive Publication Date: 2020-05-19
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a surface cationized silica nanoparticle, which is used to solve the problem that ordinary hydrophilic silica particles have limited foam stability to the formation of anionic surfactants. question

Method used

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  • Surface cationized silicon dioxide nanoparticles
  • Surface cationized silicon dioxide nanoparticles
  • Surface cationized silicon dioxide nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Prepare modifier C of silica particles according to the following steps 12 AQAS: In terms of mass components, it includes: 21.34 parts of dodecyldimethyl tertiary amine, 50 parts of absolute ethanol, and 20.86 parts of 3-chloropropyltrimethoxysilane.

[0036] Specific steps

[0037] (1) In terms of parts by mass, weigh 21.34 parts of dodecyldimethyl tertiary amine and put it into a three-neck flask,

[0038] (2) Add 50 parts of absolute ethanol to the three-necked flask in step (1), stir in an oil bath, and slowly heat up to 80°C;

[0039] (3) Add 20.86 parts of 3-chloropropyltrimethoxysilane dropwise to the three-necked flask in step (1), and pass nitrogen gas for 30 minutes;

[0040] (4) Keep the temperature at 80°C and stop the reaction after reflux for 36 hours.

Embodiment 2

[0042] Prepare modified silicon dioxide particles according to the following steps: In terms of mass components, it includes: 24 parts of absolute ethanol, 12.5 parts of pure water, 4.1 parts of ammonia water, 1.6 parts of tetraethyl orthosilicate, C 12 0.5 parts of AQAS modifier.

[0043] Specific steps

[0044] (1) In terms of parts by mass, use a pipette to measure 6.3 parts of absolute ethanol, 12.5 parts of purified water, and 4.1 parts of ammonia water, mix them evenly, and place them in a three-necked flask;

[0045] (2) Put the three-neck flask in step (1) in a magnetic stirring pot and stir at a speed of 300r / min;

[0046] (3) Measure 1.6 parts of ethyl orthosilicate and C 12 0.5 parts of AQAS modifier, measure 17.7 parts of absolute ethanol, mix well and quickly pour into the three-necked flask in step (1), this process requires that the liquid should not touch the bottle wall;

[0047] (4) Increase the stirring speed to 1200r / min. After stirring at high speed for...

Embodiment 3

[0049] Example 3 Effect of Modified Nanoparticles on the Stability of the Foam System Formed by Anionic Surfactant or Cationic Surfactant

[0050] The foam system was prepared according to the following steps: In terms of mass components, it included: 0.6 parts of modified nano-silica in Example 2, 199.06 parts of distilled water, and 0.12 parts of cetyltrimethylammonium bromide. 0.22 parts of sodium polyoxyethylene lauryl ether sulfate.

[0051] Specific steps

[0052] (1) Weigh 99.58 parts of distilled water, add 0.12 parts of cetyltrimethylammonium bromide, weigh 99.48 parts of distilled water, add 0.22 parts of polyoxyethylene lauryl ether sodium sulfate, and place in an ultrasonic water bath at 45 Heat at ℃, ultrasonically disperse for 20min;

[0053] (2) After the two solutions in step (1) are clear and transparent, weigh 0.3 parts of the modified silica particles in Example 2, respectively, add them to the two solutions and stir gently with a glass rod to disperse the...

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Abstract

The invention relates to surface cationized silicon dioxide nanoparticles. A preparation method comprises the following steps: weighing dialkyl dimethyl tertiary amine and putting the dialkyl dimethyltertiary amine into a three-neck flask; adding absolute ethyl alcohol, and stirring and slowly heating the mixture in an oil bath pan; continuing to dropwise add 3-chloropropyltrimethoxysilane, and introducing nitrogen for a period of time; maintaining the temperature, and carrying out reflux reaction to obtain a silicon dioxide particle modifier; uniformly mixing absolute ethyl alcohol, purifiedwater and ammonia water, putting the mixture into a three-neck flask, stirring the mixture, and uniformly mixing and quickly pouring tetraethoxysilane, the prepared silicon dioxide particle modifierand absolute ethyl alcohol into the three-neck flask; increasing the stirring speed for a period of time, reducing the stirring speed when the solution is milky white, continuously performing a reaction for a period of time, and terminating the reaction; and centrifuging, washing, drying and crushing the reaction product to obtain white powdery cationized nano silicon dioxide particles. The foam stabilizer can generate a synergistic effect with a surfactant to achieve an effect of stabilizing foam, so that the adaptation degree to a high-temperature stratum environment is greatly improved.

Description

Technical field: [0001] The invention belongs to the field of petrochemical industry, and in particular relates to surface cationized silicon dioxide nanoparticles. Background technique: [0002] With the continuous development of my country's crude oil resources, attention to the exploitation of heavy oil reservoirs with larger potential reserves is increasing day by day. Due to the high viscosity of heavy oil, it is difficult to extract it, and the use of steam to heat the formation to reduce the viscosity is currently the most commonly used method for heavy oil recovery. The air resistance effect of foam fluid in the formation can effectively improve the situation of formation fluid channeling and increase the swept volume. Due to the great adsorption loss of cationic surfactants and clay particles in the formation, anionic surfactants are the most commonly used surfactants in oilfield foam flooding operations. Generally, only surfactants are used in oil field foam oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/58C09K8/94C09C1/28C09C3/06C09C3/08C09C3/12C01B33/18B82Y30/00
CPCB82Y30/00C01B33/18C09C1/28C09C3/006C09C3/06C09C3/08C09C3/12C09K8/58C09K8/584C09K8/94C09K2208/10
Inventor 孙傲尹剑宇刘庆旺范振忠乔三原
Owner NORTHEAST GASOLINEEUM UNIV
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