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Production method of modified nanometer SiO2 particles with CO2/N2 response

A responsive, nano-technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as low sweep efficiency, injectability problems, corrosion hazards of pipeline equipment, etc., to achieve improved oil displacement and enhanced recovery , good responsive effect

Inactive Publication Date: 2020-02-04
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CO 2 There are corrosion hazards to pipeline equipment, and there are problems such as low sweep efficiency, which leads to the ineffective utilization of base crude oil
[0003] Conventional solutions include water-gas cross-injection, foam and gel, etc., but these methods are not suitable for unconventional reservoirs due to injectability problems

Method used

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  • Production method of modified nanometer SiO2 particles with CO2/N2 response
  • Production method of modified nanometer SiO2 particles with CO2/N2 response
  • Production method of modified nanometer SiO2 particles with CO2/N2 response

Examples

Experimental program
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Effect test

Embodiment 1

[0024] a CO 2 / N 2 Responsive modified nano-SiO 2 Granule preparation method:

[0025] S1. Silane coupling agent modified nano-SiO 2 : In a nitrogen atmosphere, nano-SiO with a particle size of 20nm 2 Put the powder in toluene, stir for 10 minutes, then add 3-aminopropyltriethoxysilane, stir and react at 75°C for 8 hours, carry out suction filtration, wash with ethanol, and after three cycles, put it in a constant temperature oven for drying to obtain Silane Coupling Agent Modified Nano-SiO 2 ;

[0026] S2.CO 2 / N 2 Responsive modified nano-SiO 2 Particles: In a nitrogen atmosphere, the silane coupling agent is modified with nano-SiO 2 Place in N,N-dimethylformamide, stir for 10 minutes, then slowly add formic acid, then add formaldehyde while stirring, raise the temperature to 85°C for 6 hours, then filter with suction, wash with ethanol, and cycle three times , placed in a constant temperature oven for drying and storage, to obtain CO 2 / N 2 Responsive modified n...

Embodiment 2

[0029] a CO 2 / N 2 Responsive modified nano-SiO 2 Granule preparation method:

[0030] S1. Silane coupling agent modified nano-SiO 2 : In a nitrogen atmosphere, 30nm nano-SiO 2 Put the powder in toluene, stir for 12 minutes, then add 3-aminopropyltrimethoxysilane, stir and react at 80°C for 10 hours, then carry out suction filtration, wash with ethanol, and after three cycles, put it in a constant temperature oven for drying to obtain silane Coupled agent modified nano-SiO 2 ;

[0031] S2.CO 2 / N 2 Responsive modified nano-SiO 2 Particles: In a nitrogen atmosphere, the silane coupling agent is modified with nano-SiO 2 Place in N,N-dimethylformamide, stir for 12 minutes, then slowly add formic acid, then add formaldehyde while stirring, raise the temperature to 90°C for 10 hours, then filter with suction, wash with ethanol, and cycle three times , placed in a constant temperature oven for drying and storage, to obtain CO 2 / N 2 Responsive modified nano-SiO 2 partic...

Embodiment 3

[0034] a CO 2 / N 2 Responsive modified nano-SiO 2 Granule preparation method:

[0035] S1. Silane coupling agent modified nano-SiO 2 : In a nitrogen atmosphere, 40nm nano-SiO 2 Put the powder in toluene, stir for 15 minutes, then add 3-aminopropyltriethoxysilane, stir and react at 85°C for 14 hours, then carry out suction filtration, wash with ethanol, and after three cycles, put it in a constant temperature oven for drying to obtain silane Coupling agent modified nano-SiO 2 ;

[0036] S2.CO 2 / N 2 Responsive modified nano-SiO 2 Particles: In a nitrogen atmosphere, the silane coupling agent is modified with nano-SiO 2 Place in N,N-dimethylformamide, stir for 15 minutes, then slowly add formic acid, then add formaldehyde while stirring, raise the temperature to 95°C for 14 hours, then filter with suction, wash with ethanol, and cycle three times , placed in a constant temperature oven for drying and storage, to obtain CO 2 / N 2 Responsive modified nano-SiO 2 partic...

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Abstract

The invention discloses a production method of modified nanometer SiO2 particles with CO2 / N2 response, and belongs to the field of oilfield chemistry. The production method of the modified nanometer SiO2 particles with CO2 / N2 response comprises the two steps: firstly, in a nitrogen atmosphere, through a silane coupling agent, modifying nanometer SiO2 powder to obtain silane-coupling-agent-modifiednanometer SiO2; and secondly, in the nitrogen atmosphere, through formic acid and formaldehyde, at 85-95 DEG C, further modifying the silane-coupling-agent-modified nanometer SiO2 to obtain the modified nanometer SiO2 particles with CO2 / N2 response. The modified nanometer SiO2 particles have excellent response to CO2 / N2 gas, can be recycled, and can adsorb CO2 when injected, and then N2 is introduced in time to desorb CO2, so that the sweep efficiency is improved, and the modified nanometer SiO2 particles with CO2 / N2 response have values and prospects of improving the oil recovery efficiencyof unconventional oil reservoirs.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, in particular to a CO 2 / N 2 Responsive modified nano-SiO 2 Method of preparation of particles. Background technique [0002] With the continuous exploitation of conventional oil reservoirs and their gradual depletion, unconventional oil reservoirs have become a focus of attention. CO 2 Flooding is a major development method for enhancing recovery of unconventional reservoirs. First, due to the CO 2 From natural gas CO 2 Gas fields and industrial waste gas, etc., taking into account the social environmental protection benefits and mining economic benefits; secondly, CO 2 When the formation temperature is greater than 31°C and the pressure is greater than 7.38MPa, it can reach a supercritical state. At this time, CO 2 Soluble in crude oil, reduce the viscosity and surface tension of crude oil, expand the volume of crude oil, change the permeability of the reservoir, and improve the displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
CPCC09K8/58
Inventor 赖南君祝庆茹覃吉春王东栋唐雷李俊邓嘉雯
Owner SOUTHWEST PETROLEUM UNIV
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