1053_3 - Univ. of Campinas --- GL Valve Temperature
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Transcript of 1053_3 - Univ. of Campinas --- GL Valve Temperature
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GAS LIFT VALVE TEMPERATURE
DISTRIBUTION: THEORETICAL
AND EXPERIMENTAL ANALYSIS
Marcelo M. Ganzarolli and Carlos A. C. Altemani
State University of Campinas, UNICAMP
Campinas , Brazil
Alcino Resende Almeida
Petrobras Research and Development Center - CENPES
Rio de Janeiro, Brazil
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OUTLINE
Introduction
Experimental Apparatus
Compact Thermal Model
Experimental Results
Numerical Simulation
Final Result
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INTRODUCTION
production oil
injection gas
N2 dome
GLV inside the
mandrel tube
TN2 = f(Toil,Tgas)
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EXPERIMENTAL APPARATUS
CONSTANT LEVEL
CONTROL VALVES
ROTAMETERS
HEATER
WATER
Pexiglas cylinder
with the steel tube
and GLV inside
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Frontal view of the experimental apparatus
20 cm
20 cm
60 cm
HOT WATER
HOT WATER
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Lateral view of the experimental apparatus
COLD FLUID
HOT WATER
HOT WATER
20 cm
20 cm
60 cm
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Cross section of the experimental apparatus
VGL
Mandrel
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Plexiglas tube, mandrel and GLV
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View of the experimental apparatus
heater
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COMPACT THERMAL MODEL
Ttp
TN2
Tbs
Tpi
Tmi
Tms
Tps
Tpd
Tij
Thermal Resistances
Production Temperature
Injection Temperature
GLV and Mandrel Nodes
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FINAL VERSION OF THE THERMAL NETWORK
Tpd
TN2 Tbs
Tij
R=500R=500
R=5
R=2,5
R=37
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THE N2 DOME
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COMPACT MODEL PREDICTIONS
The axial resistance along the GLV body was
much larger than the radial resistance from
the dome to the mandrel tube; The GLV dome temperature would be
determined basically by the circumferential
temperature distribution around the mandrel
tube;
This distribution will be a function of bothfluid temperatures as well as the
corresponding convective heat transfer
coefficients.
EXPERIMENTAL RESULTS
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20 cm
20 cm
60 cm
thermocouple
3
4
5
6
7
11
12
13
14
15
16
18 19
20
21
22
23
26
27
28
17
29
22.429
67.728
67.927
39.426
68.623
57.422
56.821
67.620
68.419
68.518
68.51752.116
34.915
33.414
37.813
32.612
51.211
67.57
67.96
67.85
67.94
67.83
TTHERMOCOUPLE
EXPERIMENTAL RESULTS
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EXPERIMENTAL RESULTS
30.0
40.0
50.0
60.0
70.0
t=0
t=5 min
t=12 min
T [oC]
N2 bellow
1311375
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NUMERICAL SIMULATION
The heat conduction was numerically simulated for a
cross section of the mandrel tube;
Convective heat transfer coefficients were specified
for both fluid streams.
gasoil
gas
TTTT*T
=
T*=f(position, hgas, hoil)
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TEMPERATURE DISTRIBUTION IN THE
MANDREL CROSS SECTION
*
GLV
T*
(OIL (T*=1)T=1) GAS (T*=0)
T*
*
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MEAN TEMPERATURE AROUND THE GLVT
*T*T
0 100 200 300 400
0.0
0.4
0.8
hOIL/hGAS
10
5
2
1
hOIL(W/m2 K)
T*
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NUMERICAL MODEL CONCLUSION
)h
h
(f*Tgas
oil
=
From definition*T
TN2=Toil + (1-) Tgas
A SIMPLE ( d i t ) THEORY
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oil
A SIMPLE (and approximate) THEORY
Toil TMgTMo Tgas
(hA)-1
oil (Sk)-1
(hA)-1
gas
TMgas
TM = Toil + (1- )TgasTM=(TMo + TMg)/2
Considering typical values for the
heat transfer coefficients and for
the conduction shape factorS
10hA
Sk
)
h
h(f
)h/h()A/A(1
1
gas
oil
gasoil
oilgas
=
+
The expression suggests
a form for the functionalrelationship
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TWO MANDREL CROSS SECTIONS
GLV GLV
75.0* =T73.0* =T
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NUMERICAL SIMULATION RESULTS
1 2 3 4 5 6 7 8 9 10 11
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
hoil/hgas
Numerical Results
Proposed Correlation
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FINAL RESULT
TN2=Toil + (1-) T gas
+
=
gas
oil
h
h
6.11
1
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THE END