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§8 METHODS FOR INCREASING OIL RECOVERY
8.1 Classification of methods for increasing oil
recovery
The effectiveness of oil recovery from oil-bearing
formations using modern industrial methods is considered
unsatisfactory in all oil producing countries, while the
consumption of petroleum products is growing worldwide every
year.
Average ultimate oil recovery in different countries and
regions is ranging from 25 to 40% and makes, for example, in
Latin America and Southeast Asia 24-27%, in Iran 16-17%, in the
USA, Canada and Saudi Arabia 33-37%, in Russia up to 40%.
It means, that the residual or non-recoverable oil runs up to 55-
75% of the initial geological oil resources (Fig. 8.1).
Therefore application of Enhances Oil Recovery (EOR)
technologies, which can considerably increase recovery in already
developed oil reservoirs.
Figure 8.1 - World recoverable and residual oil resources
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