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NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUMPTION OF GAS CHAMBER PUMPS. Fall 2001 ASME/API Gas Lift Workshop Aberdeen. Outline. Introduction Numerical Model Field Test Facility Field Test Results Conclusions. Valve 2. open. open. Valve 1. closed. - PowerPoint PPT Presentation
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NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
Fall 2001 ASME/API Gas Lift WorkshopAberdeen
NUMERICAL MODEL FOR THE PREDICTION OF FLUID NUMERICAL MODEL FOR THE PREDICTION OF FLUID
PRODUCTION AND GAS CONSUMPTION OF GAS CHAMBER PUMPSPRODUCTION AND GAS CONSUMPTION OF GAS CHAMBER PUMPS
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Outline
• Introduction
• Numerical Model
• Field Test Facility
• Field Test Results
• Conclusions
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP IntroductionIntroduction
open
Valve 2.
Valve 1. closed
open
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP IntroductionIntroduction
open
Valve 2.
Valve 1. closed
open
open
Valve 2.
Valve 1. closed
open
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP IntroductionIntroduction
AdjChoke
Inj. Gas &vent string
AdjChoke
Vent motor valve
Pilot Control System
Inj. gas motor valve
Inj.Gas line
Flowline
Csg
InsertChamber
Perfs
Intake check valve
Discharge check valve
Chamber dip tube
Prod conduit
Crossover
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP IntroductionIntroduction
Flow
Supply GasReturn Gas
Exhaust
Standing ValveAssembly
Flow Tube
ROD
Plunger
BarrelSwitchingMechani SM Valve Assembly
UnloadingValve
Choke
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP IntroductionIntroduction
Production
Gas lift val.& Mandrel
Vent
Injection
B1-A BE2.75-A
standingValve
BleedOrifice
BSTGCP
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
Advantages
• Can Handle: gassy & viscous fluids
• High Temperatures (stimulation by cyclic steam
injection)
• Can be run and pulled with wire line equipment
• No fallback losses
• Completions can be very simple
IntroductionIntroduction
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
Disadvantages
• Higher cost in surface controller equipment than
in Gas Lift
• For complex designs parts are subject to wear
and replacement
• A High-Pressure gas source is required
IntroductionIntroduction
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
General Calculation Algorithm
1) Input data: reservoir, completion,fluid properties, separation & injection pressure
2) Calc. minimum and maximum liquid level
MINIMUM LEVEL
MAXIMUM LEVEL
80% OF STATIC RESERVOIR PRESSURE
3) Calc. column increments
4) For each column calculates the liquid prod. and gas consumption separately
21 43 ….N
Numerical ModelNumerical Model
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
Calculation procedure for each column (1,2,3,….n)
•Column accumulation
•Gas Injection
•Fluids displacement by gas expansion without injection
•Gas Venting
•Fluids into the well (Pgas<Pres<Pcas)
•No Reservoir inflow (Pres<Pgas<Pcas)
•No Reservoir inflow & (Pres<Pcas<Pgas) Fluid displacement
•Gas depressurization No Reservoir inflow (Pres<Pcas<Pgas)
Model Stages
Numerical ModelNumerical Model
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Numerical ModelNumerical Model
Calculation procedure for each column (1,2,3,….n)Liquid Column Accumulation
.@1
Lmin
Pwf tt
dt
dL
Vogelt
dt
dLLL
ttmintt
1
2
ncolumn for 2 maxtt LL
no
LPwfPwf
LL
ttt
ltt
tt
1
2
1
yes
stage-sub inj. gas 1 To st
ncolumn for on accumulati liquid tT
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Numerical ModelNumerical Model
Calculation procedure for each column (1,2,3,….n)
All other Stages
System divided in the following control volumes
• Gas injection tubing
• Liquid chamber+subsurface valve
• annulus space
• flow line
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Numerical ModelNumerical Model
Calculation procedure for each column (1,2,3,….n)
All other StagesInitial conditions: L, Pwf, Pinj, time, gas injected=0, liquid velocity
For each C.V. :Continuity, Momentum, Eq. of state, Gas flow through chokes, liquid flow through chokes
1@
.,,
dt
dP
for seq' algebraic ofset
ttimedt
dVeloc
dt
dL
112
'
Euler
ttt t
Conditions at t2: L, Pwf, Pinj, time, gas injected, liquid velocity...
Stage check
Finish stage
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
open
Valve 2.
Valve 1. closed
open
Test FacilityTest Facility
2500 ft
Pressure and temp. sensors
3 1/2” tubingR-2823 API
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ProgramTest Program
Average liquid column length = 520 ft
Gas injection and venting stages
M e a s u r e d G a s L i q u i d R a t i o sG a s F l o w
R a t e . ( M C F D )I n j . G L R ( S C F / B r )
4 2 0 1 1 3 5 , 65 9 7 1 2 2 3 , 57 9 6 1 5 4 6 , 08 4 6 1 3 7 1 , 99 2 9 1 1 9 7 , 8
1 0 1 4 1 6 6 9 , 21 1 1 9 2 3 1 4 , 91 1 7 5 1 6 6 1 , 8
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ResultsTest Results
Gas Inj. Rate 420 MSCFD
0
100
200
300
400
500
600
700
800
900
1000
09:28:10 09:31:03 09:33:56 09:36:48 09:39:41 09:42:34 09:45:27 09:48:20
Time (s)
Well
head
pre
ssu
re (
psi)
.
MeasuredCalculated
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ResultsTest Results
Pressure drop across the R-28 valve. Gas rate 597 MSCFD
-10
-5
0
5
10
15
02:06:40 02:09:33 02:12:26 02:15:18 02:18:11 02:21:04
Time (s)
Pre
ss
ure
dro
p (
ps
i)
Measured
Calculated
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ResultsTest Results
Well head pressure during gas venting stage
0
100
200
300
400
500
600
700
13:52:19 13:53:46 13:55:12 13:56:38
Time (s)
Pre
ssu
re (
psi
)
Measured well headpressure
Calculated well headpressure
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ResultsTest Results
E x p e r i m e n t a l R e s u l t sG a s F l o w
R a t e .( M C F D )
I n j .T i m e( m i n )
I n i t i a lC o l u m n
( f t )
F i n a lC o l u m n
( f t )
G a s I n j .p e r C y c l e
( S C F )
S u r f a c e I n j .P r e s s u r e
( p s i )
4 2 0 2 2 , 0 0 7 5 5 1 0 8 6 4 2 8 9 1 3 , 95 9 7 1 4 , 6 6 8 0 6 1 7 3 6 0 8 5 8 9 6 , 97 9 6 1 4 , 0 0 7 7 8 1 6 7 7 7 3 9 9 0 9 , 78 4 6 1 2 , 0 0 9 3 8 2 7 4 7 0 5 0 8 7 8 , 69 2 9 8 , 6 7 8 4 2 3 3 6 5 5 9 3 8 6 1 , 5
1 0 1 4 7 , 6 7 8 4 0 4 1 1 5 3 9 9 8 5 1 , 01 1 1 9 7 , 8 3 7 9 3 4 6 3 6 0 9 1 8 3 6 , 61 1 7 5 7 , 1 6 8 6 5 5 2 8 5 8 5 2 8 2 8 , 4
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ResultsTest Results
• Very inefficient completion used for the tests
• Very small liquid columns simulating a low producer well
• Tests with c-t gave less than 50% of these GLRs
M e a s u r e d G a s L i q u i d R a t i o sG a s F l o w
R a t e . ( M C F D )I n j . G L R ( S C F / B r )
4 2 0 1 1 3 5 , 65 9 7 1 2 2 3 , 57 9 6 1 5 4 6 , 08 4 6 1 3 7 1 , 99 2 9 1 1 9 7 , 8
1 0 1 4 1 6 6 9 , 21 1 1 9 2 3 1 4 , 91 1 7 5 1 6 6 1 , 8
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP Test ResultsTest Results
M o d e l d e v i a t i o nG a s F l o w R a t e .
( M C F D )G a s I n j . T i m e
D e v i a t i o n( % )
G a s V o l u m e p e rC y c l e D e v i a t i o n
( % )
M a x . S u r f a c e G a sI n j . P r e s s u r e
( % )
4 2 0 1 , 2 1 , 1 0 , 85 9 7 1 , 4 1 , 3 0 , 87 9 6 - 6 , 1 - 6 , 1 - 0 , 88 4 6 - 6 , 2 - 6 , 2 - 1 , 39 2 9 - 2 , 6 - 2 , 6 - 0 , 9
1 0 1 4 - 5 , 4 - 5 , 4 - 2 , 51 1 1 9 - 7 , 4 - 7 , 4 - 2 , 21 1 7 5 - 9 , 1 - 9 , 1 - 3 , 5
NUMERICAL MODEL FOR THE PREDICTION OF FLUID PRODUCTION AND GAS CONSUPTION OF GAS CHAMBER PUMPS
PDVSAINTEVEP
• A numerical model was developed for gas chamber pumps
• A field scale test program was carried out on gas pumps.
• Even though the completion used for the tests was highly inefficient, the injection GLR measured for each test were within the economical limit.
• The model predicts the test results within a 10% global accuracy for the operating conditions found during the tests.
ConclusionsConclusions