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A kind of sulfonated silica nanoparticles and its preparation method and application

A technology of sulfonated silica and nanoparticles, applied in the field of oil field, can solve the problems of low oil well production, poor production capacity and water injection capacity, etc., and achieves improved rock wettability, improved dispersion, and good crude oil recovery. Effect

Active Publication Date: 2020-09-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to poor production capacity and water injection capacity of oil-wet low-permeability reservoirs, the production of oil wells is not high

Method used

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  • A kind of sulfonated silica nanoparticles and its preparation method and application
  • A kind of sulfonated silica nanoparticles and its preparation method and application
  • A kind of sulfonated silica nanoparticles and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment provides a sulfonated silica nanoparticle and a preparation method thereof. The preparation method includes the following steps:

[0035] In step 1, the silica nanoparticles are dried in a vacuum drying oven at 100° C. for 24 hours, and cooled to room temperature naturally to obtain pretreated silica nanoparticles.

[0036] Step 2, ultrasonically disperse the pretreated silica nanoparticles (ultrasonic dispersion time is 30-40min, ultrasonic power is 200-400W, ultrasonic frequency is 30-50Hz) into water and stir for 40min; then add γ-mercaptopropane The temperature of the γ-mercaptopropyltrimethoxysilane was raised to 30° C., and the reaction product was obtained after a constant temperature reaction for 12 hours; wherein, the mass ratio of the pretreated silica nanoparticles to the γ-mercaptopropyltrimethoxysilane was 10:1.

[0037] Step 3, adding hydrogen peroxide with a mass concentration of 30% to the reaction product and stirring for 24 hours...

Embodiment 2

[0040] This example provides a test experiment in which the sulfonated silica nanoparticles prepared in Example 1 change the wettability of rocks. During the experiment, lipophilic quartz flakes were used to simulate low-permeability reservoir rocks, and the experiment was carried out at a simulated reservoir temperature of 45 °C. The specific experimental steps are as follows:

[0041] (1) The sulfonated silica nanoparticles prepared in Example 1 were prepared into different concentrations (1000mg / L, 3000mg / L, 5000mg / L, 7500mg / L, 10000mg / L) of sulfonated dioxide using deionized water The silicon nanoparticle solution is ready for use.

[0042] (2) Fully contact the lipophilic quartz flake with the sulfonated silica nanoparticle solution for 24 hours at room temperature to reach a contact equilibrium state, take out the quartz flake fully in contact with the sulfonated silica nanoparticle solution, and dry it. , to measure the water-oil-solid three-phase contact angle. The ...

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Abstract

The invention provides sulfonated silicon dioxide nanoparticles as well as a preparation method and application thereof. The preparation method comprises the following steps that vacuum drying is carried out on silicon dioxide nanoparticles so as to obtain pretreated silicon dioxide nanoparticles; the pretreated silicon dioxide nanoparticles are ultrasonically dispersed into water, and stirring iscarried out; then gamma-Mercaptopropyltrimethoxysilane is added and heated for reaction so as to obtain a reaction product; and hydrogen peroxide is added into the reaction product, stirring is carried out for reaction, and then filtering and vacuum drying are carried out so as to obtain the sulfonated silicon dioxide nano-particles. According to the sulfonated silicon dioxide nanoparticles, theaverage particle size is 100-155 nm, the particle size distribution is narrow, the dispersion uniformity is good, the stability is high, the wettability change capability is strong, and in addition, acertain emulsifying capacity is achieved; and the sulfonated silicon dioxide nanoparticles are used for improving the rock wettability of a low-permeability reservoir, and the recovery rate of crudeoil can be well improved.

Description

technical field [0001] The invention belongs to the technical field of oil fields, and in particular relates to a sulfonated silica nanoparticle and a preparation method and application thereof. Background technique [0002] For low-permeability reservoirs, due to their low permeability, small oil-water flow channels, and high capillary pressure, the reservoir water injection pressure is high. With traditional water injection development methods, crude oil can hardly be recovered from the reservoir. The wettability of the rock affects the relative permeability of oil and water, the distribution of the remaining oil in the reservoir and the characteristics of water injection development, and also determines the size and direction of the capillary force in the pores. Due to the poor production capacity and water injection capacity of oil-wet, low-permeability reservoirs, oil well production is not high. SUMMARY OF THE INVENTION [0003] Based on the problems existing in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18C09K8/58
CPCC01B33/18C01P2004/62C09K8/58
Inventor 吴海荣杨蒙李哲侯吉瑞康万利苟聪博高凯袁永杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)