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   
   n 1    d   n 1    d
F 1     1   0 d ;  ) 6 . 5 ( F 2    0 . ) 7 . 5 (
0     d      d
   n 1  0  n 1

0

The graphical dependencies of F 1(æ) and F 2(æ) can be
seen in Fig. 5.4.

Figure 5.4 - Auxiliary functions F 1(æ) and F 2(æ)

Auxiliary function F 1(æ) is used for oil-extraction rate
estimation.
F   F  
1
i
 0 1    1  i , (5.8)
i
1  i
where æ i and æ i-1 - the ratio of permeability for the two extreme
sections of the reservoir where the oil extraction is estimating; F i
and F i-1 - auxiliary functions for two values of æ i and æ i-1, which
can be calculated by the formula (5.6), η 0 - potential oil extraction,
which estimated as:

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