Page 22 - A Practical Companion to Reservoir Stimulation

RESERVOIR AND WELL CONSIDERATIONS

EXAMPLE A-4
Forecast of Transient Well Performance With the variables given and calculated in Example A- 1, Eq.
A- 13 reduces to (before stimulation)

Assuming that the bottomhole pressure for the well analyzed 1584
in Example A- 1 is 750 psi, construct a 1 80-day deliverability 4= log r + 10.03' (A-14)
curve both before and after acidizing (assume that s = 0 after
stimulation). and (after stimulation, s = 0)

Solution (Ref. Section 1-2.1) 1584
4= (A-15)
Equation 1 - 13 can be rearranged as log t + 3.04
(Note that in Eqs. A-14 and A-15, the time, t, must be in
kh (Pi - Pwf)
4= hours.)
162.6 Bp Figure A-8 is a graph of expected performance assuming
k 1' the 750-psi flowing bottomhole pressure before and after
stimulation. The rates at the 180-day landmark are 240
4w, 6. STB/d and 1 18 STB/d, respectively.
log t + log ~ - 3.23 + 0.87s . (A-13)

300

280

260

240

220

200

180

160

140

s = +8
120

100
0 1 2 3 4 5 6
t (months)

Figure A-8-Forecast of performance of well in Example A-4.

A-1 1