Page 238 - Principles of Catalyst Development

Part HI: Case Stud 219

0.00708 £

where
r e = drainage radius (ft)
= wellbore radius (ft)
r w
S = skin

K e = k roK abs ~ effective permeability (md)
^«« = net thickness (ft)
Given S = -0.5, r w = 0.25 ft and
2 /2
r o - 0.14(Ax 2 + A^ )' - 40ft

with A* = A.y = 200 ft., we find
P/D = 1.55 x 10- 3 K absh net

** r 0. Table 22- 1 presents the calculation of PID for each layer identified
where r e
by well log analysis.

Table 22-1
Estimate of PID by Layer
Layer K al* [md] h «m PID
n
1 75 72 8.4
2 0 20 0
3 250 64 24.8
4 250 32 12.4

Oil Well FBHP Estimate
The production well model needs a flowing bottomhole pressure (FBHP).
Assuming an oil column in the wellbore, we can prepare a quick estimate of
FBHP for a single-phase oil well that is completed at a 9500 ft depth by
assuming FBHP ~ oil head. Consequently, oil head is approximated by

Y 0 Az ~ FBHP