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• W3080921402 abstract "Abstract The theoretical basis of traditional polymer flooding technology is to improve the viscosity of displacement phase, in order to enhance oil recovery significantly. However, polymer solution is a continuous phase viscous fluid, and it cannot distinguish the large or small pore, which causes the damage in low permeability layer. Furthermore, it leads to the entry profile inversion phenomenon and the reduction of injection and liquid production capacity in the field application. Aiming at these problems, a novel particle type microgel (self-adaptive microgel) flooding technology has been developed in recent years. The appearance of self-adaptive microgel is spherical. And it is dispersed in water when displacing oil. Firstly, in this paper its basic physical and chemical properties were studied. Then the pore scale mechanism model of reservoir is used to simulate the flooding process of traditional polymer and self-adaptive microgel, which proves the mechanism advancement of self-adaptive microgel flooding. On this basis, the oil displacement effect evaluation was carried out by the macro physical simulation experiments. Furthermore, this technology has been applied in 8 reservoirs with different conditions. Results show that, self-adaptive microgels have good water swelling properties. They expand rapidly in the initial stage, and then gradually tend to be stable. Secondly, the pore scale simulation experiment shows that, microgel particles present the motion feature of migration, trapping, deformation in the porous media. Meanwhile, the particles gather in the larger pore to form the bridge block, and their carrier fluid displace oil in the small pore. So they work in cooperation, which can reduce the flow ability of water phase in the big pore and improve the flow ability of residual oil in small pore. Furthermore, the 3D macro physical simulation experiment shows that, self-adaptive microgel flooding can achieve better oil displacement effect than polymer flooding. Finally, this technology has been applied in 8 oilfields with different conditions, which contains the reservoir temperature from 24 to 126 °C, crude oil viscosity from 1.36 to 156 mPa.s, water cut from 81.4% to 97.5% and recovery degree from 9.55% to 64.4%. And they all obtain good technical and economic effect, with the lowest input-output ratio of 1.67 and the highest of 14.37. Summing up the lab studies and field trial, the new particle-type microgel flooding technology is more efficient and progressiveness. Therefore, its mechanism and performance are further studied in this paper. Meanwhile, its field trial effects are explored and analyzed. The research results provide theoretical basis and technical support for the popularization and application of self-adaptive microgel flooding technology, which may also provide some reference for oil companies to make a wise investment decision in low oil price period." @default.
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• W3080921402 date "2020-08-30" @default.
• W3080921402 modified "2023-09-25" @default.
• W3080921402 title "The Theory Exploration and Practice Research of a Novel Particle Type Microgel Flooding Technology" @default.
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• W3080921402 doi "https://doi.org/10.2118/200426-ms" @default.
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