Introduction

Pumping carbon dioxide into oil reservoirs is one of the most promising and quickly developing methods to increase oil recovery. A large-scale introduction of the method in the USA showed its effectiveness for oilfields during different stages of development and in reservoirs having a wide range of geology, structure and oil properties.

Data published in the international press and results of trial CO2 injection into Russian oilfields shows that the main technological factor that limits the

development of the method is the quick inrush or channelling of CO2 into producing wells along strata or structures with high permeability. The main instrument to control the process of oil extraction is sequential injection of CO2 and water slugs. Recently, surfactant-water solutions have been used to push CO2 to increase the effectiveness of the technology.

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