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Study on Equi-fluidity and Parallel Multi-slug Displacement after Polymer Flooding Using Polymer Surfactants
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
The polymer surfactant, integrating the effects of polymer and surfactant, is one of them as a new kind of mono-system flooding chemicals. And the so-called equi-fluidity and parallel multi-slug displacement (EPD) is approximately parallel displacement of vertical inhomogeneous formations by injecting multiple slugs of different volume, different viscosities and different properties in a certain order. To enhance the oil recovery and optimize the production, the effect and implementation parameters of equi-fluidity and parallel multi-slug displacement after polymer flooding using polymer surfactants is studied by methods of both experiments and numerical simulation in this paper. The results indicates that EPD could result in approximate quasi-piston displacement, reducing channeling by allowing different viscosity segments to enter the formation of matched permeability, enhancing the oil recovery of vertical inhomogeneous formation significantly after polymer flooding, up to 7∼10%. Through orthogonal test, the order of the importance of influencing factors from high to low is turns, PV and injection rate, which could direct the optimization of EPD.