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A kind of preparation method of intelligent nano oil displacement agent

An oil-displacing agent and intelligent technology, applied in the field of preparation of intelligent nano-oil-displacing agent, can solve the problems of difficult removal, cumbersome preparation process, affecting the quality of crude oil, etc. Effect

Active Publication Date: 2017-09-12
HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nano-displacement agents have achieved good results in the process of oil displacement and improved oil recovery, but the main problems still exist: (1) The hydrophilic and lipophilic properties of nanoparticles are difficult to control. If the nano-particles If the hydrophilicity is too strong, the ability to displace crude oil will be weak. If the nano-particles are highly lipophilic, the recovered crude oil will contain more nanoparticles, which will be difficult to remove and affect the quality of crude oil; (2) Control of the particle size of nanoparticles , it is necessary to compound by synthesizing nanoparticles of different particle sizes, and the preparation process is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 15g of nano-silica and 10mL of vinyltrimethoxysilane coupling agent in 120mL of ethanol, and stir for 2 hours. Weigh 5g of acrylamide and dissolve 15g of N-isopropylacrylamide in 150mL of water. After it is completely dissolved, add the above mixed system, add 1.8g of potassium persulfate, raise the temperature to 70°C, and react for 5 hours to obtain a smart compound Nanoparticle dispersion;

[0026] Next, 15 g of sodium hydroxide and 25 g of sodium lauryl sulfate were sequentially added to the above-mentioned nanoparticle dispersion, and stirred for 6 hours at room temperature to obtain a smart nano oil displacing agent.

Embodiment 2

[0028] Dissolve 25g of nano-silica and 35mL of vinyltriethoxysilane coupling agent in 140mL of N,N-dimethylformamide, and stir for 3 hours. Weigh 3g of acrylamide, 1g of methyl methacrylate, and 28g of N-isopropylacrylamide and dissolve them in 200mL of water. After they are completely dissolved, add the above mixed system, add 2.5g of ammonium persulfate, heat up to 80°C, and react After 4 hours, the smart composite nanoparticle dispersion was prepared;

[0029] Next, 23g of sodium carbonate and 18g of sodium lauryl sulfate were sequentially added to the above-mentioned nanoparticle dispersion, and stirred for 5 hours at room temperature to obtain the intelligent nano-oil displacing agent.

Embodiment 3

[0031] Dissolve 20g of nano-calcium carbonate and 25mL of γ-methacryloxypropyltrimethoxysilane coupling agent in 120mL of water and ethanol mixed solution, and stir for 5 hours. Weigh 10g of acrylamide, 2g of butyl methacrylate, and 35g of N, N-dimethylacrylamide and dissolve it in 300mL of ethanol. After it is completely dissolved, add the above mixed system, add 2.5g of sodium persulfate, and heat up to 80 ℃, reacted for 5 hours, and prepared a smart composite nanoparticle dispersion;

[0032] 15g of potassium carbonate and 12g of sodium dodecylbenzenesulfonate were sequentially added to the above-mentioned nanoparticle dispersion, and stirred for 8 hours at room temperature to obtain an intelligent nano-oil displacing agent.

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Abstract

The invention discloses a preparation method of a nano oil displacement agent with intelligent characteristics. Graft temperature-sensitive polymers, hydrophilic polymers, and hydrophobic polymers to the surface of nanoparticles through covalent bonds to prepare composite nanoparticles with temperature-sensitive properties, and then compound them with alkali and surfactants to obtain Intelligent nano-displacing agent with temperature-responsive properties. The characteristic of the nanometer oil displacement agent is that the hydrophilic and lipophilic properties of the nanometer oil displacement agent can be adjusted as the temperature of the displacement fluid changes during use. The formation temperature is high, and the nano-displacing agent is lipophilic, which is conducive to the exfoliation of crude oil from the rock surface and the recovery factor. The surface temperature is low, and the nano oil displacement agent is hydrophilic, and oil-water separation can be achieved quickly without demulsifiers. Moreover, the size of nanoparticles will change accordingly with different temperatures, and realize the dual functions of controllable plugging, profile control and plugging removal in the formation.

Description

technical field [0001] The invention relates to the field of functional nanomaterials for oil and gas fields to enhance oil recovery, in particular to a preparation method of an intelligent nanometer oil displacement agent. Background technique [0002] Nanoparticles are tiny particles with a size between 1-100nm. Nanoparticles have small particle size, large specific surface area, and high surface activity. In recent years, the application of nanoparticles in the field of oil and gas fields has begun to attract attention, and nano oil displacement agents have been highly valued due to their unique oil displacement performance. The nano oil displacement agent has a large specific surface area and surface energy, which can significantly reduce the oil-water interfacial tension, so that the injected fluid can easily peel off the crude oil in the rock pores and be displaced by the displacement fluid. At the same time, nanoparticles have a temporary blocking effect on the tiny...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C08F230/08C08F220/56C08F220/54C08F220/14
CPCC09K8/58C09K8/588C08F230/08C09K2208/10C08F220/56C08F220/1804C08F220/14C08F220/54
Inventor 刘松荫刘正刘方
Owner HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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