PUMP - AOG

Dynamic Simulation of Subsea Multiphase
Pumping System to Optimize Full System
Operability
Dianita Sandy
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Key Learnings Outcomes
To understand...
The safe operability
aspect of subsea
multiphase pump system
The importance of
dynamic simulation
The importance of
dynamic simulation in full
system network
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Subsea Multiphase Pump (MPP) Applications
Background
• A demand for novel technology to promote higher
volume recovery
Benefit
• It processes untreated well-fluid, thus eliminate a need
of separation and possible double flowline system
Challenge
• Limitation on pump operating envelope must be carefully
investigated under all circumstances of field operation
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
FMC/Sulzer Subsea Multiphase Pump
Pump specification
Motor
Power
Pressure rating
Water Depth
Boost up to Δp
GVF
Pump
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
= 3.2 MW
= 5k psi
= 2000m
= 100 bar @ 60% GVF
= 0-100%
Differential Pressure (bar)
Pump Operating Envelope
Max
Speed
Surge
Line
Choke
Line
Min Speed
Flowrate (m3/hr)
Min/Max
Speed
March 2015
AOG 2015 - Perth
Surge
Line
Choke
Line
Power
Limitation
Dianita Sandy – FMC Technologies APME
GVF
PROCESS CONTROL PHILOSOPHY
Minimum
Flow
Controller
March 2015
AOG 2015 - Perth
Pump
Speed
Controller
Dianita Sandy – FMC Technologies APME
Engineering Design STAGE to STAGE
Detailed
Early
Concept
Selection
Verify equipment
size
Estimate
Production
Recovery
Process Control
Philosophy
Define equipment
size and
configuration
Verify Procedure
Steady State
Simulation
March 2015
AOG 2015 - Perth
Dynamic
Simulation
Dianita Sandy – FMC Technologies APME
TOOLS & METHODOLOGY
FlowManagerTM
Arrival
MULTIVARIABLE NETWORK SIMULATOR
Flowing WellHead
[pressure/temperature
/rates]
Riser
[pressure/temperature/rates]
Subsea
Processing
Flowlines
[pressure/temperature
/rates]
Flowing Bottom Hole
[pressure/temperature/rates]
March 2015
AOG 2015 - Perth
Arrival
[pressure/temperature/
rates]
Dianita Sandy – FMC Technologies APME
Case Study
WD = -762m
WD = -2837m
8inch riser
Approx. 1.5km
8inch NPS
Approx. 10km
WD = -762m
WD = 30m
WD = -2837m
March 2015
AOG 2015 - Perth
WD = -762m
WD = -700m
Dianita Sandy – FMC Technologies APME
WD = -700m
PUMP STATION
Liquid Extraction Unit
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
MODEL OVERVIEW
100
Variables
% opening
Reservoir Pressure (bara)
446
Reservoir Temperature (°C)
90
Constant PI (Sm3/d/bar)
12
GOR (Sm3/Sm3)
P
82.3
WC (%)
47
Arrival Pressure (bara)
25
0
T
Value
% opening
P
100
% opening
Pump Speed
4100
rpm
Fixed Variable
User interface
variable
P
March 2015
T
Automatic
calculated variable
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Normal Operations
ΔP
254 bar
7 bar
202 m3/h
March 2015
AOG 2015 - Perth
Actual Flowrate
Dianita Sandy – FMC Technologies APME
1107 m3/h
Operational Challenges
We need to
turndown
production. How
fast can we do?
March 2015
AOG 2015 - Perth
#$%^$&*%$
#?!
Dianita Sandy – FMC Technologies APME
Dynamic Response – Turndown Operation
Fast turn-down :
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Dynamic Response – Turndown Operation (cont’d)
Slow turn - down :
Only with full field dynamic simulation, the
effect of the way well being operated and
the boosting pump response can be
investigated.
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Observing pump operating flowrate
Fast turn-down :
March 2015
AOG 2015 - Perth
Slow turn - down :
Dianita Sandy – FMC Technologies APME
Dynamic Response - Riser
Riser
From the flowline
PUMP
For illustration only
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Surging conditions
in riser might be
essential to be
investigated –
correlates with
pump response
and its behavior.
Especially, if its
severe near the
riser base/pump
discharge point).
Operational Challenges (cont’d)
What are other potential challenges ?
We need to
turndown
production. How
fast can we do?
#$%^$&*%$#?!
-
Its time to ramp the production up back to
normal? How fast can we do?
There is issue at topside platform. We shall shutdown the production. While they fixing it.
Water has come up (water breakthrough) – is the
system fine with that?
Reservoir pressure is depleting, but we need to
maintain production
This well is less energy/less pressure to the
others – which one shall we utilized first?
………
………
………
………
And the list carries on
Optimize this with full field simulation…
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Why Dynamic Simulation?
It does not overlook the transition between
each system disturbance
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Why Full Field Simulation?
Interacting pressure and temperature variables
amongst different location derives a corresponding
flowrate and other dependent variables of the
system
The integrated system simulations from wells to
arrival facility including the pump station give a
better understanding of the total system.
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Flow Advisory System (FAS)
-Look ahead
analysis
FAS
PROCESSOR
OFFLINE
MODEL
Integrated model is
“easily” converted into
FAS processor – very
useful for operation esp
for challenging field
ONLINE
INSTRUMENTATION
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Running towards
future prediction
corresponds to some
potential disturbances,
based on initial
condition similar to
condition at present
time
-What-if
analysis
Running towards
future prediction
corresponds to some
potential disturbances,
based on user
specified initial
condition
Special Thanks To
•
•
•
•
March 2015
Gandi Rahmawan Setyadi (FMC Technologies, Asker)
Jamaal Jibola Ahmed (FMC Technologies, Asker)
Randi Moe (FMC Technologies, Asker)
Terje Hollingsæter (FMC Technologies, Asker)
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME
Thank you for your attention
Dianita Sandy
Engineer, Production Performance Services
(FMC Technologies APME)
Dianita.Sandy@fmcti.com
March 2015
AOG 2015 - Perth
Dianita Sandy – FMC Technologies APME