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Interest towards Enhanced Oil Recovery methods is
increasing every year all over the world and researches aimed at
finding scientific approach to choosing the most effective EOR are
developing rapidly.
In order to improve the economic efficiency of oil field
development and to reduce direct capital investments the entire
period of oil field development is usually divided into three main
stages.
At the first stage of oil production (primary production)
the natural energy of an oil field is used as much as possible. This
energy is mostly the elastic energy, the energy of the dissolved
gas, the energy of the gas cap and the potential energy of
gravitational forces (Fig. 8.2).
Figure 8.2 - Primary production
At the second stage methods to maintain reservoir
pressure by injecting water or gas are implemented. These
methods were called methods of secondary production (Fig. 8.3).
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