A ternary composite oil displacement system based on the synergistic enhancement of nanofluid and polymer

Abstract

The present invention discloses a ternary composite oil displacement system based on the synergistic enhancement of nanofluid and polymer, belonging to the technical field of petroleum extraction, comprising a pre-treatment unit, a nanofluid supply unit, a temperature-resistant and salt-tolerant polymer supply unit, a composite mixing unit, an online enhancement injection unit, and a formation synergistic displacement unit. The outlet of the pre-treatment unit is connected to the composite mixing unit, and the nanofluid supply unit and the temperature-resistant and salt-tolerant polymer supply unit are connected in parallel to the composite mixing unit; through the synergistic action of the nanofluid and the temperature-resistant and salt-tolerant polymer, multiple synergistic effects of “ dispersion stability, viscosity enhancement, flow regulation, and residual oil stripping ” are achieved. Modified nanoparticles and temperature-resistant and salt-tolerant polymer molecules form hydrogen bonds and electrostatic adsorption composite interactions, which not only significantly improve the solubility and viscosity stability of the polymer under high-temperature and high-mineralization formation water environments, but also prevent degradation of the polymer molecular chains.

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