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1. Wellhead and Surface Gathering
Systems

2. Outline
• Flow through Choke
• Flow through Flowline
• Gathering Systems

3. Flow
through
Choke

4. What causes the pressure
drop through choke?
ρ
p
g
CA
q c Δ
=
2

5. Single-Phase Liquid Flow
ρ
p
Cd
q
Δ
= 2
2
800
,
22
q = bbl/d
C = chart
d2 = in.
Δp = psi
ρ = lbm/ft3

6. d2
1
2
d
d

7. Gas-Liquid Flow
C
B
L
hf
D
GLR
Aq
p
64
)
(
=
qL = bbl/d
GLR = SCF/bbl
D64 = 1/64 in.
phf = psi
Critical flow
Correlation A B C
Gilbert 10.0 0.546 1.89
Ros 17.4 0.500 2.00
Baxendell 9.56 0.546 1.93
Achong 3.82 0.650 1.88
Pilehvari 46.67 0.313 2.11

8. Example 10-11:
GLR = 500 SCF/bbl
D64 = 16, 24, and 32 1/64 in.
Calculate critical flow choke performance

9. 89
.
1
64
546
.
0
)
500
(
10
D
q
p
L
hf =
L
hf
L
hf
L
hf
q
p
q
p
q
p
43
.
0
73
.
0
57
.
1
=
=
= for D64 = 16
for D64 = 24
for D64 = 32

11. Flow through
Flowline

13. Pressure Gradient Correlations
• Beggs and Brill
• Eaton
• Dukler

14. Gathering Systems
Gathering Manifolds