A kind of coated silicon dioxide microsphere and preparation method thereof

A silica and film-coated technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of cumbersome preparation process, limit the wide application of resin-coated proppant, etc., and achieve improved dispersion. High performance, simple method, and the effect of preventing agglomeration

Inactive Publication Date: 2019-07-23
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of these methods is cumbersome and generally takes longer than 4 hours, which limits the wide application of resin-coated proppants

Method used

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  • A kind of coated silicon dioxide microsphere and preparation method thereof
  • A kind of coated silicon dioxide microsphere and preparation method thereof
  • A kind of coated silicon dioxide microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The invention provides a preparation method of coated silica microspheres, comprising the following steps:

[0031] (1) mixing silicon dioxide, hydroxyl compound and water to obtain a mixed material liquid;

[0032] (2) heating up the mixed material liquid obtained in the step (1), and coating the silicon dioxide with the hydroxyl compound in water to obtain coated silicon dioxide;

[0033] (3) mixing the coated silicon dioxide obtained in the step (2) with a dispersant and an emulsifier for dispersion and emulsification to obtain an emulsion;

[0034] (4) under the action of an acidic catalyst, the emulsion obtained in the step (3) is subjected to a cross-linking reaction to obtain coated silica;

[0035] The cross-linking agent for the cross-linking reaction is an aldehyde-based cross-linking agent.

[0036] In the present invention, unless otherwise specified, the raw materials used in the preparation method of the coated silica microspheres are all commercially av...

Embodiment 1

[0053] (1) Put 1.5g of silicon dioxide, 4.0g of polyvinyl alcohol, and 40mL of distilled water in a container with a thermometer, a stirrer and a condenser tube and stir until they are evenly mixed.

[0054] (2) The above container was used as a reaction container, and the reaction temperature was set to 90° C., heated and stirred for 1 hour until the solution became transparent, and the coating process was completed, and then the temperature was lowered to 50° C.

[0055] (3) Add 80mL of liquid paraffin and 2g of span-80 to the coated reaction vessel, and stir rapidly at a speed of 700r / min for 1h using the inverse emulsification method to disperse into a stable emulsion; in order to reduce the particle size distribution of the product , slow down the speed, and continue to emulsify for 30 minutes at a speed of 300r / min.

[0056] (4) After the emulsification is completed, add 7.5g mass concentration of 0.06g / cm 3 Cross-linking agent glutaraldehyde solution and 0.6mL catalyst...

Embodiment 2

[0060] Prepare coated silica microspheres according to the method of Example 1, the difference is that in step (2) the coating process is heated and stirred at 100°C for 0.5h until the solution becomes transparent, the coating process is completed, and then the temperature is lowered to 50°C; Step (3) In the process of dispersing emulsification, emulsify at 750rpm for 1.5h, and at 400rpm for 0.5h; step (4) adjust the amount of glutaraldehyde to 9.5g, and cross-link for 0.5h.

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Abstract

The invention provides a laminated silicon dioxide microsphere and a preparing method thereof. The preparing method is simple, and the laminated silicon dioxide microsphere can be prepared within 3-4h. A hydroxyl compound coats the surface of silicon dioxide through the hydroxylation effect, then in the emulsification process, through a dispersing agent, mutual cementation of coated silicon dioxide is effectively avoided, and the dispersity is improved; then through the further utilization of emulgator, the surface tension of coated silicon dioxide is lowered, a protection layer can be formedon the surface of coated silicon dioxide, and cohesion of coated silicon dioxide is further prevented. Under the effect of a catalyst, the hydroxyl compound coating the surface of silicon dioxide issubjected to an aldolization reaction with an aldehyde group cross-linking agent, cross-linking of the aldehyde group cross-linking agent and the hydroxyl compound is achieved, and then a product which is obtained through the aldolization reaction of the cross-linking agent and the hydroxyl compound is formed on the surface of silicon dioxide.

Description

technical field [0001] The invention belongs to the technical field of proppant for hydraulic fracturing, in particular to a film-coated silica microsphere and a preparation method thereof. Background technique [0002] With the development of oil extraction industry, hydraulic fracturing technology is an effective technology for oil field stimulation, such as end screenout fracturing technology, repeated fracturing technology, fracture detection technology, fracture height control technology during fracturing and high permeability layer Sand control fracturing technology, and the solid particles used to support fractures are called oil fracturing proppants (also called hydraulic fracturing proppants), or proppants for short. As the key material of fracturing stimulation construction in oil and gas well stimulation engineering, proppant's performance directly affects the stimulation capacity of the entire oil well. At first, the proppant material is mainly quartz and glass ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor 张定军赵文锦吴彦飞张国庆马应霞陈振斌
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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