Page 342 - Fundamentals of Reservoir Engineering

REAL GAS FLOW: GAS WELL TESTING 277

(m(p) FQ 2 n ) / Qn
∆
−
2
(psia /cp/Mscf /d)

4100

a

4000

∆ Q j
3900 Q m(t D n t − D j 1 )
D
−
6.5 6.75 7.0 7.25 n
2
(m(p) FQ n ) / Qn
−
∆
2
(psia / cp /Mscf / d)
4400

4300

b
4200

∆ Q j
4100 m(t D t − D )
D
−
7.0 7.25 7.5 Q n n j 1
(m(p) FQ 2 n ) / Qn
−
∆
2
(psia /cp/Mscf /d)
4500

4400

c
4300

4200 ∆ Q j
7.5 7.75 8.0 Q n m(t D n t − D j 1 )
D
−

CORRECT ANALYSIS; m EVALUATED USING EQU. (8.40)
D
TRANSIENT ; m (8.32)“ D “ “ “
Fig. 8.13 The effect of the length of the individual flow periods on the analysis of a
multi-rate gas well test; (a) 4× ×× ×1 hr periods, (b) 4× ×× ×2 hrs, (c) 4× ×× ×4 hrs