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A surface-modified nano-silica nanofluid for enhanced oil recovery

A technology for surface modification of nano- and nano-silica, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the cumbersome steps of modifying nano-silica, inconvenient promotion and application of industrial products, and crude oil recovery Low efficiency and other problems, to achieve the effect of enhanced oil recovery, low environmental requirements for synthesis, and simple preparation methods

Active Publication Date: 2020-09-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the steps of modified nano-silica provided by this method are cumbersome, the synthesis process is relatively complicated, and the product can only be obtained after a secondary reaction, and the enhanced oil recovery rate is low, and the promotion and application of its industrialized products are relatively inconvenient.

Method used

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  • A surface-modified nano-silica nanofluid for enhanced oil recovery
  • A surface-modified nano-silica nanofluid for enhanced oil recovery
  • A surface-modified nano-silica nanofluid for enhanced oil recovery

Examples

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preparation example Construction

[0036] The preparation method of the surface-modified nano silica modified by the acid anhydride comprises the following steps:

[0037] 1) Add the hydrophilic surface hydroxyl nano-silica into the organic solvent, the mass percentage of the hydrophilic surface hydroxyl nano-silica is 1-1.5%, and the organic solvent is toluene, cyclohexane, tetrahydrofuran or N,N- One of the dimethylformamides, mechanically stirred for 30 minutes at a speed of 700-800 rpm, and then ultrasonically dispersed at 50°C for 1-2 hours using an ultrasonic cleaner to ensure the stability of nano-silica in organic solvents Dispersion effect, to obtain nano-silicon dioxide stock solution;

[0038] 2) adding the acid anhydride organic matter into the nano-silica stock solution, the mass ratio of the acid anhydride organic matter to the hydrophilic surface hydroxyl nano-silica in the nano-silica stock solution is 1.5-2:1, at room temperature 25°C Under magnetic stirring for 12 hours, the rotation speed is...

Embodiment 1

[0044] 2g particle size 15nm, specific surface area 380m 2 / g of hydrophilic surface hydroxyl nano-silica dispersed in 200ml N,N-dimethylformamide, mechanically stirred for 30 minutes at a speed of 700 rpm, and then ultrasonically dispersed at 50°C for 1 hour using an ultrasonic cleaner , to obtain nano silica stock solution.

[0045] Weigh 3 g of succinic anhydride and add it to the nano-silica stock solution, and magnetically stir for 12 hours at a room temperature of 25° C. at a speed of 700 rpm to obtain a succinic anhydride surface-modified nano-silica reaction solution.

[0046] Put the succinic anhydride surface-modified nano-silica reaction solution into a centrifuge at a speed of 8,500 rpm, centrifuge at a high speed for 15 minutes, take out the upper layer liquid and collect the centrifuged product, and centrifuge the upper layer liquid again at a high speed for 15 minutes. The rotation speed was 8500 rpm, the upper liquid was poured off, and the centrifuged product...

Embodiment 2

[0053] 3g particle size 20nm, specific surface area 200m 2 / g of hydrophilic surface hydroxyl nano-silica dispersed in 300ml of cyclohexane, mechanically stirred for 30 minutes at a speed of 750 rpm, and then ultrasonically dispersed at 50°C for 1 hour using an ultrasonic cleaner to obtain nano-silica Silicon stock solution.

[0054] Weigh 5 g of maleic anhydride and add it to the nano-silica stock solution, and magnetically stir for 12 hours at a room temperature of 25° C. at a speed of 750 rpm to obtain a maleic anhydride surface-modified nano-silica reaction solution.

[0055] Put the maleic anhydride surface-modified nano-silica reaction solution into a centrifuge at a speed of 8500 rpm, centrifuge at a high speed for 15 minutes, take out the upper layer liquid and collect the centrifuged product, and perform high-speed centrifugation on the upper layer liquid again for 15 minutes. Minutes, the rotation speed is 8500 rev / min, the upper layer liquid is poured off, and the ...

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Abstract

The invention discloses a surface-modified nano-silica nanofluid for improving oil recovery. The surface-modified nano-silica modified by acid anhydride is dispersed in water to obtain a dispersion liquid. The surface-modified nano-silica modified by acid anhydride is The mass percentage of silicon dioxide in the dispersion liquid is 0.01-1%. The dispersion liquid is obtained by adjusting the pH value to 9-11 at 40-100° C. with an aqueous solution of sodium hydroxide. The anhydride-modified surface-modified nano-silica and the nano-fluid for enhancing oil recovery provided by the invention have a simple preparation method, can be self-dispersed in water without adding any dispersant, have good dispersibility and stability, and have low cost of raw materials. It is easy to be prepared on site and popularized on a large scale, and can effectively improve the oil recovery rate of low-permeability oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil recovery chemistry in the development of functional nanometer materials and oil and gas fields, in particular to a surface-modified nano silicon dioxide nanofluid used for improving oil recovery. Background technique [0002] As an efficient and extensive energy source, petroleum plays an irreplaceable role in the national economy. With the rapid development of the national economy, the demand for petroleum energy is also increasing. With the continuous progress of oil and gas exploration and development, the reserves of easy-to-exploit oil and gas reservoirs are also decreasing. Therefore, the proportion of exploration and development of low-permeability oil and gas resources is increasing, and higher requirements are put forward for the development technology of low-permeability oil and gas reservoirs. In recent years, the newly proven ultra-low permeability reservoirs contain extremely rich reserve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/58C09K8/584C09K2208/06C09K2208/10
Inventor 戴彩丽张跃赵明伟吴一宁高明伟高志宾何皓楠王若玙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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