Method for preparing intelligent nanometer oil-displacing agent
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An oil-displacing agent and nanotechnology, 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: 2015-04-22
HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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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.
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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-methacryloxypropyl trimethoxysilane 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 method for preparing an intelligent nanometer oil-displacing agent. The method comprises the following steps: grafting a temperature-sensitive polymer, a hydrophilic polymer and a hydrophobic polymermer to the surfaces of nanoparticles by virtue of a covalent bond so as to prepare composite nanoparticles with temperature sensitive characteristic; and compounding the composite nanoparticles with alkali and surfactants, thereby obtaining the intelligent nanometer oil-displacing agent with temperature response characteristic. The nanometer oil-displacing agent has the characteristics that according to change of displacing fluid along with temperature in the using process, the hydrophilic and oleophylic performances of the nanometer oil-displacing agent can be regulated. The formation temperature is high, the nanometer oil-displacing agent is oleophylic, crude oil is conveniently stripped from the rock surface, and the recovery ratio is improved. The formation temperature is low, the nanometer oil-displacing agent is hydrophilic, and oil-water separation can be rapidly realized without a demulsifying agent. Moreover, the sizes of the nanoparticles correspondingly change along with temperature difference, and controllable dual effects of plugging and profile control and plug removal are achieved 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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