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Chapte
r 3 – P ressure Transient Analysis (PTA) -p124/743
Fig. 3.J.7 – Test data matched with a rate dependant skin
3.J.4.b
Simulating non-Darcy flow with a numerical model
In a numerical model the (non linear) non-Darcy flow effect is included in the flow equation
through the value of the (non linear) non-Darcy flow coefficient,
which appears in the
Forchheimer equation:
2
u
u
k x
P
It can be evaluated from the linear assumption described above using
dq ds
/
with:
k
h r
dq ds
w
2
/
or from an empirical equation:
5.0 5.5
1
005 .0
k
Sw