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Preparation method of intelligent nano-foam oil-displacing agent

A technology of nano-foam and oil-displacing agent, applied in the field of oil-displacing agent, can solve the problems of cumbersome process, low recovery rate, difficult to control and control the hydrophilicity and lipophilicity of nanoparticles, and achieves the effect of rapid recovery and expansion of the swept area.

Active Publication Date: 2018-10-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nano-displacement agents can improve oil recovery during the oil displacement process, but the recovery rate is still not very high, and there is still much room for improvement. The price of nano-displacement agents is relatively low.
The oil-water emulsion obtained after oil displacement needs to be further processed, and the process is cumbersome
Moreover, the hydrophilicity and lipophilicity of the nanoparticles themselves are difficult to control, and the oil displacement efficiency is not high if the hydrophilicity and lipophilicity of the nanoparticles are too strong, and the addition of nanoparticles with too strong lipophilicity will make the crude oil contain too many nanoparticles, affecting the crude oil. quality

Method used

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  • Preparation method of intelligent nano-foam oil-displacing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Firstly, nano-scale ferric oxide is prepared: take a certain amount of FeCl 3 ·6H 2 Dissolve O in water first, pass nitrogen gas into the solution for 30 minutes, and then add appropriate amount of FeCl 2 4H 2 O to dissolve it completely. The appropriate dimethylaminoethyl methacrylate (DMA) was then added. The mixture was reacted at 80°C for 30 minutes. Finally, the obtained solution was separated, washed and dried. The obtained product is nano-scale ferric oxide.

[0026] 0.1g Fe 3 o 4 Disperse in 200 ml of deionized water and add 1 g of polyvinylpyrrolidone. The solution was purged with nitrogen for 30 minutes. Then, 1 g of N-isopropylacrylamide, 0.1 g of potassium persulfate, and 0.05 g of sodium p-styrenesulfonate were sequentially added. Heated to 80°C for 12 hours. Finally the resulting solution was dried by centrifugation. Nanoparticles that respond to temperature and magnetic fields are obtained.

[0027] The obtained nanoparticles were dispersed i...

Embodiment 2

[0030] 0.1 g magnetic nanoparticles MFe 2 o 4 (M=Ni, Co, Zn) was dispersed in 200ml of deionized water and 1g of dodecyltrimethylammonium bromide was added. The solution was purged with nitrogen for 30 minutes. Then, 1 g of methoxyethyl methacrylate, 0.1 g of ammonium persulfate, and 0.05 g of sodium vinylsulfonate were added in sequence. Heated to 80°C for 12 hours. Finally the resulting solution was dried by centrifugation. Nanoparticles that respond to temperature and magnetic fields are obtained.

[0031] The obtained nanoparticles are dispersed in water together with 1 g of sodium dodecylsulfonate foaming agent, and then stirred at a high speed for 5 hours to obtain smart nano-foam.

Embodiment 3

[0033] 0.1 g magnetic nanoparticles α-Fe 2 o 3 Disperse in 200ml deionized water and add 1g sodium dodecylbenzenesulfonate). The solution was purged with nitrogen for 30 minutes. Then, 1 g of 2-(N,N-dimethylamino)methacrylate, 0.1 g of sodium persulfate, and 0.05 g of sodium styrenesulfonate were added in sequence. Heated to 80°C for 12 hours. Finally the resulting solution was dried by centrifugation. Nanoparticles that respond to temperature and magnetic fields are obtained.

[0034] The obtained nanoparticles are dispersed in water together with 1 g of sodium dodecylbenzenesulfonate foaming agent, and then stirred at high speed for 5 hours to obtain smart nano-foam.

[0035] To sum up, the present invention prepares composite nanoparticles with temperature-sensitivity and magnetic response by grafting temperature-sensitive polymers onto the surface of magnetic nanoparticles, and the nanoparticles have the characteristics of stable foam. The feature of this oil displac...

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Abstract

The invention discloses a preparation method of an intelligent nano-foam oil-displacing agent. By grafting a temperature-sensitive polymer onto magnetic nano particle surfaces, compound nano particleswith the temperature-sensitive property and magnetic response are prepared, and the nano particles have the property of stabilizing foam. The oil-displacing agent has the characteristics that the hydrophilia and lipophilicity of the oil-displacing agent can be adjusted and controlled; when the formation temperature is high, the nano particles show the lipophilicity, and when the foam meets crudeoil, the foam bursts, which is beneficial to peeling the crude oil off a rock stratum surface and improving the recovery ratio; when the temperature is low, the nano particles show the hydrophilia, which is beneficial to separation of oil and water, and through an applied magnetic field, recovery of the nano particles can be fast achieved; moreover, the foam-displacing liquid can respond to the magnetic field, so that through the applied magnetic field, flow of the displacing liquid can be controlled.

Description

technical field [0001] The invention relates to an oil-displacing agent, in particular to a preparation method of an intelligent nano-foam oil-displacing agent. Background technique [0002] Petroleum is an important non-renewable energy source, but in the process of oil exploitation, after primary oil recovery and secondary oil recovery, the average recovery rate rarely exceeds 50%, and in some cases it has reached 70%-80%, but if controlled Not good, maybe even less than 30%. After primary oil recovery and secondary oil recovery, there is still a large amount of crude oil in the oil reservoir, which needs to be extracted by physical and chemical methods, that is, tertiary oil recovery. From the perspective of long-term development, improving tertiary oil recovery technology is the fundamental way to enhance oil recovery. There are many methods of tertiary oil recovery, such as: chemical flooding, gas flooding, thermal flooding and microbial flooding, and nano oil recover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584C09K8/60C09K8/88C09K8/94C08F220/54C08F220/28C08F226/02C08F228/02C08F2/44
CPCC08F2/44C08F220/28C08F220/281C08F220/54C08F226/02C09K8/584C09K8/588C09K8/602C09K8/882C09K8/94C09K2208/10C08F212/14C08F228/02
Inventor 江希甄景超陈庆云白博峰
Owner XI AN JIAOTONG UNIV
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