Dynamic Simulation of Subsea Multiphase Pumping System to ... · March 2015 AOG 2015 - Perth Dianita Sandy – FMC Technologies APME Subsea Multiphase Pump (MPP) Applications •

AOG 2015 - Perth March 2015 Dianita Sandy – FMC Technologies APME

Dynamic Simulation of Subsea Multiphase

Pumping System to Optimize Full System

Operability

Dianita Sandy


Key Learnings Outcomes

The safe operability aspect of subsea multiphase pump system

The importance of dynamic simulation

The importance of dynamic simulation in full system network

To understand...


Subsea Multiphase Pump (MPP) Applications

• A demand for novel technology to promote higher volume recovery

Background

• It processes untreated well-fluid, thus eliminate a need of separation and possible double flowline system

Benefit

• Limitation on pump operating envelope must be carefully investigated under all circumstances of field operation

Challenge


FMC/Sulzer Subsea Multiphase Pump

Motor

Pump

Pump specification Power = 3.2 MW Pressure rating = 5k psi Water Depth = 2000m Boost up to Δp = 100 bar @ 60% GVF GVF = 0-100%


Pump Operating Envelope

Min/Max Speed

Surge Line

Choke Line

Power Limitation

GVF

Surge Line

Choke Line

Min Speed

Max Speed

Dif

fere

nti

al

Pre

ssu

re (

bar)

Flowrate (m3/hr)


PROCESS CONTROL PHILOSOPHY

Minimum Flow

Controller

Pump Speed

Controller


Engineering Design STAGE to STAGE

Process Control

Philosophy

Define equipment

size and

configuration

Verify equipment

size

Verify Procedure

Early Detailed

Steady State

Simulation

Estimate

Production

Recovery

Concept

Selection

Dynamic

Simulation


TOOLS & METHODOLOGY

Subsea

Processing

Flowing Bottom Hole

[pressure/temperature/rates]

Flowing WellHead

[pressure/temperature

/rates]

Flowlines

[pressure/temperature

/rates]

Arrival

[pressure/temperature/

rates]

Riser

[pressure/temperature/rates]

FlowManagerTM

MULTIVARIABLE NETWORK SIMULATOR

Arrival


Case Study

8inch NPS

Approx. 10km

8inch riser

Approx. 1.5km

WD = -762m WD = -700m WD = -700m

WD = 30m

WD = -762m

WD = -2837m

WD = -2837m

WD = -762m


PUMP STATION

Liquid Extraction Unit


MODEL OVERVIEW

P T

P T

P

% opening

% opening

% opening

rpm Pump Speed

Variables Value

Reservoir Pressure (bara) 446

Reservoir Temperature (°C) 90

Constant PI (Sm3/d/bar) 12

GOR (Sm3/Sm3) 82.3

WC (%) 47

Arrival Pressure (bara) 25

Fixed Variable

User interface

variable

Automatic

calculated variable

100

100

0

4100


Normal Operations

254 bar

7 bar

ΔP

202 m3/h 1107 m3/h Actual Flowrate


Operational Challenges

We need to

turndown

production. How

fast can we do?

#$%^$&*%$

#?!


Dynamic Response – Turndown Operation

Fast turn-down :


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.


Observing pump operating flowrate

Fast turn-down :

Slow turn - down :


Dynamic Response - Riser

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).

PUMP From the flowline

Riser

For illustration only


Operational Challenges (cont’d)

We need to

turndown

production. How

fast can we do?

#$%^$&*%$#?!

What are other potential challenges ?

- Its time to ramp the production up back to

normal? How fast can we do?

- There is issue at topside platform. We shall shut-

down 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…


Why Dynamic Simulation?

It does not overlook the transition between

each system disturbance


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.


Flow Advisory System (FAS)

-Look ahead

analysis

-What-if

analysis

Running towards

future prediction

corresponds to some

potential disturbances,

based on initial

condition similar to

condition at present

time

Running towards

future prediction

corresponds to some

potential disturbances,

based on user

specified initial

condition

OFFLINE

MODEL

FAS

PROCESSOR

ONLINE

INSTRUMENTATION

Integrated model is

“easily” converted into

FAS processor – very

useful for operation esp

for challenging field


Special Thanks To

• Gandi Rahmawan Setyadi (FMC Technologies, Asker)

• Jamaal Jibola Ahmed (FMC Technologies, Asker)

• Randi Moe (FMC Technologies, Asker)

• Terje Hollingsæter (FMC Technologies, Asker)


Thank you for your attention

Dianita Sandy

Engineer, Production Performance Services

(FMC Technologies APME)

[email protected]

Documents

Dynamic Simulation of Subsea Multiphase Pumping System to ... · March 2015 AOG 2015 - Perth Dianita Sandy – FMC Technologies APME Subsea Multiphase Pump (MPP) Applications •