Preparation method of temperature-resistant and salt-tolerant nano oil displacement agent

An oil displacement agent and salt-resistant technology, applied in the field of nano functional materials for oil and gas fields to enhance oil recovery

Active Publication Date: 2014-04-16
HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the composite nanoparticle system prepared by this method, there is mainly a physical interaction between the polymer and the nanoparticles, and this interaction is relatively weak, so that the nanoparticles encounter shear and frictional resistance during the operation of the formation. Surface polymers are prone to peeling off
Especially in formations with harsh environments such as high temperature and high salinity, the polymer on the surface of the nanoparticles will fall off in large quantities, so the nanoparticles are very easy to agglomerate, grow up, and become particles with a larger particle size, thereby losing the driving force of the nanoparticles. oil advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a three-necked flask, add 20 g of nano silicon dioxide and 12 mL of vinyltrimethoxysilane coupling agent, and stir for 3 hours. Weigh 18g of acrylamide and dissolve it in 125mL of water. After it is completely dissolved, add the above mixing system, add 1.2g of potassium persulfate, raise the temperature to 65°C, and react for 3 hours to obtain polyacrylamide-modified silica nanoparticle dispersion liquid;

[0024] Add 18g of sodium hydroxide and 20g of sodium lauryl sulfate to the polyacrylamide-modified silica nanoparticle dispersion prepared above in sequence, and stir for 4 hours at room temperature to obtain a temperature-resistant and salt-resistant Nano oil displacing agent.

Embodiment 2

[0026] In a three-necked flask, add 15 g of nano silicon dioxide and 8 mL of vinyltriethoxysilane coupling agent, and stir for 3 hours. Weigh 25g of acrylamide and dissolve it in 180mL of water. After it is completely dissolved, add the above-mentioned mixing system, add 1.8g of potassium persulfate, raise the temperature to 75°C, and react for 4 hours to obtain a polyacrylamide-modified silica nanoparticle dispersion liquid;

[0027] Add 28g of sodium carbonate and 15g of sodium lauryl sulfate into the above-prepared polyacrylamide-modified silica nanoparticle dispersion in sequence, and at room temperature for 5 hours, a temperature-resistant and salt-resistant nano-flooding Oil agent.

Embodiment 3

[0029] Into a three-necked flask, 18 g of nano-silica and 12 mL of γ-methacryloxypropyltrimethoxysilane coupling agent were added, and stirred for 3 hours. Weigh 29g of acrylamide and dissolve it in 175mL of water. After it is completely dissolved, add the above-mentioned mixing system, add 1.2g of potassium persulfate, raise the temperature to 75°C, and react for 5 hours to obtain a polyacrylamide-modified silica nanoparticle dispersion liquid;

[0030] Add 23g of potassium carbonate and 19g of sodium dodecylsulfonate in sequence to the above-prepared polyacrylamide-modified silica nanoparticle dispersion, and at room temperature for 5 hours, the temperature-resistant and salt-resistant nanoparticle oil repellant.

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Abstract

The invention provides a preparation method of a temperature-resistant and salt-tolerant nano oil displacement agent. The preparation method comprises the following steps: modifying polyacrylamide to surfaces of silica nanoparticles through chemical bonds to obtain nano-composite particles with stable performance, and then using the nano-composite particles together with alkali and a surfactant to prepare the nano oil displacement agent. The nano oil displacement agent can solve the problem about high possibility of falling off of a polymer on the surface of a traditional nano oil displacement agent in the formation moving process, so as to achieve an excellent oil displacement effect. Especially in the high-temperature and high-salt formation, the nano oil displacement agent can overcome harsh formation conditions and cannot reduce the oil displacement effect.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant nanometer oil displacement agent material, which belongs to the field of nanometer functional materials for oil and gas fields to enhance recovery. Background technique [0002] In the process of oil recovery in the oil field, after primary oil recovery and secondary oil recovery (water flooding), there is still a large amount of oil in the formation that has not been recovered, and the remaining crude oil must be effectively recovered through tertiary oil recovery technology. The development of tertiary oil recovery technology has gone through the stages of alkali flooding, polymer flooding and composite ASP flooding system, and has achieved good results in enhancing oil recovery. In recent years, with the development of nanotechnology, nano-displacement systems have received widespread attention, and nano-materials have shown excellent performance in the field of oil displacement due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/588B82Y30/00B82Y40/00
CPCC09K8/584C09K8/588C09K2208/10
Inventor 刘松荫刘正正刘方方刘彦彬王中奇
Owner HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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