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t
 Q inj b В  dtt
m  t 0 . (4.4)
ac


  Q oil b oil  Q w b  Q los  k    dtt


w
0   

4.1.3 Determination of injection wells number

In general, the number of injection wells
Q
n inj  inj , (4.5)
q inj

where q inj - the amount of water pumped into one well
(acceleration), which is determined by the formula
2 k  h P  P 
q  w bh inj line , (4.6)
inj 
 ln r 
w

rw inj
where k w - phase permeability for water in the near wellbore zone
of injection well k w = (0.5-0.6)k; P bh inj – bottomhole pressure of
injection well; P line - pressure at the line injection; ψ - formation
damage coefficient, (ψ≥2). Determined according to research by
injection or industrial data obtained in similar fields; μ w -
coefficient of dynamic viscosity of water (μ w = 1 mPa·s); σ – a
half distance between injection wells; r rw inj – reduce radius of
injection wells.
A half distance between injection wells is determined
B
  , (4.7)
2 n inj
where B - the length of the injection line.

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