A kind of preparation method of intelligent nano oil displacement agent

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...