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to maintain reservoir pressure by injection of water, we should
solve the following tasks:
1) to determine the location of injection wells;
2) to determine the amount of water injected;
3) to determine the number of injection wells;
4) to establishing requirements for injected water.

4.1.1 Location of injection wells

The location of the injection wells is determined mainly
by geological considerations. Choosing of wells locations are
carried out with taking into account the specific geological
conditions and state of development of field based on
hydrodynamic studies and feasibility calculations. The main
problem is in order to choose locations of injection wells in which
ensure the most efficient connection between the injection zone
and the selection zone and uniform displacement of oil by water.
One of the main methods of effective communication between the
injection zone and the selection zone is the maximum
approximation injection line or injection wells to production wells.
But this approach can lead to disruption uniform displacement of
WOC.
Depending from the locations of water injection wells are
distinguished such systems flooding:
- edge flooding;
- marginal flooding;
- inside contour flooding;
- block systems of development;
- focal flooding;
- pattern flooding;
- selective flooding;
- barrier flooding.

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