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Wells not placed in a row, but based on the distribution of
reservoir properties of the reservoir area. Location injection wells
are chosen after drilling area and study reservoir properties
according to industrial-geophysical and hydrodynamic researches.
During those selected injection wells, pumping water that provide
the most complete excavation around the reservoir, that is the well
where the biggest productivity factor and the well, which
discovered the layer of high permeability and good hydrodynamic
coupling to the surrounding wells. Drilling carried out at a uniform
triangular or square grids. All wells originally commissioned as oil
producing. And then producing wells become injection wells.
Barrier flooding. Barrier flooding used in the
development of gas-oil fields with a large volume of gas caps,
when a possible simultaneous selection of oil from the oil part and
gas from the gas cap. As a result of water injection into wells
forms a water barrier, which "cuts off" the gas cap from the oil
deposit. When the barrier flooding applies a single cutting oil and
gas deposits in certain areas of self-development. Injection wells
are placed in the area of GOC (gas-oil contact) and injection water
and selection of oil and gas regulating such a way that there was
displacement of oil and gas from water in case of exclusion of
mutual flows of oil in the gas reservoir and the gas to the oil part
(Fig. 4.6).

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