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Fig. 3.15 – Dependence of average formation pressure
and gas-oil ratio (GOR) from oil saturation

Condition Q(t) = const possible only for the initial stage
of development of the field when the formation pressure is high
and the condition of constant flow rate at the fountain and the
mechanized methods, as in these conditions although a decrease in
the formation and bottom-hole pressures, their value is still high
and selection can be made adjustable oil.
At the later stage of development, when the formation and
bottom-hole pressures do not provide flowing wells, and power
mechanized method (increase immersion tubing or pump) is fully
used, the condition of constancy exercise selection is not possible.
Then justified wells in operation is Р вh = const.
Equation flow of oil from the reservoir into the well has
the form
2 kh H  H 
Q  f bh , (3.34)
ln R d
r r w

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