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PGE 362
Production Engineering
HWK 3
This assignment is due at lecture time on Friday, Sept. 28, 2007.
(1) Please compute the flowing surface pressure for a gas well with the following data.
Bottom hole pressure (P1) = 4000 psi
Bottom hole temperature (T1) = 200 deg F
Depth = 8000’
Hole Angle from horizontal = 90 degrees
Tubing ID = 2”
Surface temperature (T2) = 100 deg F
Gas gravity = 0.7
Gas Flow Rate = 2,000 MScf/Day
Please use the PPS software in the LRC to estimate the gas properties.
You may assume a hydraulically smooth pipe
Iterate until the pressure change is less than 2%.
Please refer to section 73 in the text.
The surface pressure is unknown. Therefore, the average values for gas viscosity and z
factor are also unknown.
Iteration 1:
Assume the gas properties do not change between P1 and P2.
(
29
(
29
(
29
(
29
(
29
(
29
Re
1/ 4
0.25
Re
2
2
2
1
From PPS at 150 deg F avg temperature:
0.0254 cp
z=0.88
0.7 2000
20.09
20.09
553,661
2 0.0254
0.0791
0.0791
0.0029
553,661
0.0375 0.7 sin 90 8,000
0.0375 sin
0.391
0.88 460 150
q
N
D
f
N
L
s
zT
p
p e
μ
γ
θ
=
=
=
=
=
=
=


=
=
= 
+
=
(
29
(
29
(
29
(
29
(
29
(
29
(
29
2
3
5
2
2
2
0.391
3
0.391
2
5
2
2.685 10
1
sin
0.0029 0.88 460 150 2000
4000
2.685 10
1
sin 90 2
3,276 psi
s
s
f zTq
x
e
D
p
e
x
e
p




+

+
=
+

=
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 Spring '08
 Bommer

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