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Preparation method of surface modified nano silicon dioxide colloid

A nano-silica, surface modification technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of not finding nano-materials, high initial viscosity, etc.

Inactive Publication Date: 2013-06-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial viscosity of the dispersion is too high to be suitable for flow control of displacement fluid during oil recovery
Moreover, no research has been found to apply the shear thickening properties of nanomaterials to underground oil displacement.

Method used

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  • Preparation method of surface modified nano silicon dioxide colloid

Examples

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Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of the surface-modified nano-silica colloid provided by the invention may comprise the following steps:

[0026] Step 1 link bridging agent: with nano-silica particle: the weight ratio of organic solvent=1: 10-1: 30, add organic solvent and nano-silica particle successively in the three-necked bottle that stirrer is housed, with appropriate Stir at a rotating speed for 30-60min, then move the three-necked bottle into an ultrasonic oscillator, and ultrasonically oscillate for 30-60min, then place the three-necked bottle in a constant temperature water bath, connect the reflux condenser and the stirrer, and use bridging agent: nano-dioxide Silicon particles = 1:0.8-1:3 weight ratio, add bridging agent to the three-neck flask under stirring at room temperature, heat up to 60-110°C under continuous stirring and react at constant temperature for 2-6h to obtain surface link bridging agent nano-silica mixed solution;

[0027] Step 2 linking surface modi...

Embodiment 1

[0031] This embodiment provides a surface-modified nano-silica colloid, the preparation method of which comprises the following steps:

[0032] Add 100mL of toluene and 5g of nano-silica particles with a particle size of 10nm to a three-necked bottle equipped with a stirrer, and stir for 30 minutes at a speed of 300 rpm, then move the three-necked bottle into an ultrasonic oscillator, and oscillate ultrasonically for 30 minutes. Afterwards, place the three-necked flask in a constant temperature water bath, connect the reflux condenser and the stirrer, add 3 g of toluene diisocyanate into the three-necked flask under stirring conditions at room temperature, raise the temperature to 80° C. under constant stirring, and react at a constant temperature for 4 hours to obtain Nano-silica mixed solution of surface link bridging agent;

[0033] Then add 22g of polyethylene glycol (molecular weight is 1000) to the three-necked bottle containing the nano-silica mixed solution of the surf...

Embodiment 2

[0036] This embodiment provides a surface-modified nano-silica colloid, the preparation method of which comprises the following steps:

[0037] Add 200 mL of toluene and 5 g of nano-silica particles with a particle size of 10 nm to a three-necked bottle equipped with an agitator, and stir for 30 min at a speed of 300 rpm, then move the three-necked bottle into an ultrasonic oscillator, and oscillate for 30 min. Afterwards, place the three-necked flask in a constant temperature water bath, connect the reflux condenser and the stirrer, add 0.5 g of toluene diisocyanate into the three-necked flask under stirring at room temperature, raise the temperature to 80° C. under continuous stirring and react at a constant temperature for 4 hours. Obtain the nano-silicon dioxide mixed solution of the surface link bridging agent;

[0038] Then add 22g of polyethylene glycol (molecular weight is 10000) to the three-necked bottle containing the nano-silica mixed solution of the surface link b...

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Abstract

The invention relates to a preparation method of surface modified nano silicon dioxide colloid, which comprises the following step: linking surface modifier to surfaces of nano silicon dioxide particles through a bridging agent, thus obtaining surface modified nano silicon dioxide colloid. The invention also relates to the surface modified nano silicon dioxide colloid which is prepared through the preparation method. The invention also relates to application of the surface modified nano silicon dioxide colloid in preparation of a shear thickening liquid. The surface modified nano silicon dioxide colloid provided by the invention has shear thickening property; and when being used for oil displacement, the shear thickening liquid prepared from the surface modified nano silicon dioxide colloid can achieve the effects of controlling the fluidity and increasing the swept volume so as to enhance the oil recovery ratio.

Description

technical field [0001] The invention relates to a method for preparing surface-modified nano-silica colloid, in particular to a method for preparing surface-modified nano-silica colloid used for preparing shear thickening liquid, and belongs to the technical field of chemicals for enhanced oil recovery in the petroleum industry . Background technique [0002] With the rapid development of my country's national economy, the demand for oil is increasing year by year. In the current situation where world oil prices have risen sharply, a large amount of oil imports has undoubtedly become a heavy burden on my country's economic development. After the traditional primary oil recovery and secondary oil recovery, my country's main oil fields have entered the stage of tertiary oil recovery. The technology of greatly enhancing oil recovery is a major research topic of common concern in domestic and foreign oil development circles. [0003] Nanotechnology is an interdisciplinary sub...

Claims

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Application Information

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IPC IPC(8): C09K8/58
Inventor 卜家泰王晨张付生蔡永生
Owner PETROCHINA CO LTD
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