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Fiber Optic Monitoring

Subsea Flowlines

Dana DuToit

Omnisens S.A.

MTS Leak Detection Symposium

November 2014

© Omnisens 2014

Omnisens - Technology

Subsea Umbilicals (What we’ve learned)

Subsea Flow Lines (2 Case Studies)

Direct Electrical Heating (DEH)

Indirect Heating (PiP)

Pipeline Concept for SS Leak Detection

Agenda

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Privately-owned Swiss company, established in 1999

Spin-off from Swiss Federal Institute of Technology in

Lausanne (EPFL)

Headquarters in Morges, Switzerland

Offices in USA and Brazil

Highly educated team

Worldwide customer base

Distributors/Integrators in:

South America

Middle East

Europe

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Omnisens is a world leader in high performance fiber optic monitoring.

Our fiber-optic solutions help organizations protect critical resources and

avoid the escalating consequences of delayed incident detection

protecting people, places and reputations along the way.

Asia (Malaysia)

Russia

Africa

Corporate Overview

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Broad Range Of Capabilities

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Engineering and design

Project management

Procurement

Manufacturing

Systems integration and testing

Installation and commissioning

Offshore intervention

Service, support and training

Software design and licensing

Omnisens operates according to the following

industry standards:

ISO 9001

ISO 14001

OHSAS 18001

Omnisens is certified by Achilles

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Industries served

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Our Technology

Turning optical fibers into fully distributed sensors

One interrogator connected

...to one fiber to monitor

thousands of locations

Local temperature or

strain

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The physics behind the

monitoring

Scattering processes

Laser, lo

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Scattering medium

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Sensing Technology 1/2

Laser, lo

Scattering processes used

for sensing applications:

Rayleigh

Detects loss variations

(OTDR and Fault location)

Raman

Scattered magnitude is

temperature dependent

Brillouin

Scattered frequency is

temperature and strain

sensitive (leakage, ground

movement, deformation)

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Time Domain

The activating signal is

a propagating pulse and

the position is given by

the time of flight.

Spatial resolution is given

by the pulse width.

Frequency Domain

The frequency shift is

computed by recording the

Brillouin spectrum at different

frequencies and extracting

the maximum peak location.

and

Time domain analysis

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Sensing Technology 2/2

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Summary of Brillouin Scattering Benefits

Frequency Modulated Measurement

Independent of changing optical loss

Maintenance of sensor size and performance over long range

Fundamental power formatting advantage in silica fibers

Large optical budget (>40dB)

Effective Monitoring range is now as far as 100Km

FM measurement technique compatible with Optical Amplifier technology

Effective monitoring range can be extended to > 300Km

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Umbilical’s – Quick review

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> 900,000 flex cycles Sensor performance confirmed

Umbilical : Sensor Design and Integration

Deployed system

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Bending strain monitoring

Strain/Temp Sensing Cable

Instrumented power umbilical

Monitoring of

Bending, tension, torsion strain

Temperature

> 900,000 flex cycles

Sensor performance confirmed

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Condition monitoring

Power Umbilical – Offshore

Australia

How would the umbilical respond

to the increased load imposed by

new pumps?

Successful temperature

measurement during operation,

despite:

Attenuation: 30 dB

high reflexing peak of 13 dB

Fiber optic rotary joint

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Flowline – Monitoring Experience

Flowline bundles

Direct Electrical

Heating DEH

Electrically

Heated Pipe in

Pipe

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The Challenge

to maintain temperature

above a critical threshold

during long shut down and

start-up periods.

Heated Pipe-in-Pipe (ETH-PiP)

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The Solution

Fully Distributed Sensing:

provides the temperature of the

heated elements

helps optimise the heating with

respect to the targeted pipeline

temperature

Heated Pipe-in-Pipe (ETH-PiP)

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Temperatures measured during first ETH-PiP

heating and cooling

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Pipe elevation profile

Pipe temperature profiles

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Some 5 installations with up to 44 km DEH subsea flowline

monitored, including with riser and feeder cable

Direct Electrical Heated Cable System

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Temperature profile example from one project

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Profiles during DEH cable energization

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Experience Summary

Subsea Umbilical Riser and

Flowline (SURF) monitoring…

Flow assurance – temperature evolution and

alerts with location for flowlines, pipelines

Leak detection and location in flowlines,

umbilicals, risers.

Umbilical fatigue (strain) and condition

(temperature and strain) monitoring

Validation of design and operation models

Heating control for DEH and ETH-PiP flowline,

• Closed loop, real time feedback

• Overheat detection

• Heating performance

Damage warning thanks to fiber optic break

detection

… for subsea structure integrity.

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Concepts for SS Leak Detection

Utilize a Pipe-in-Pipe approach

Infrastructure is available for deployment

In-situ conduits within the annulus Most linear sensors can be either pre-installed or blown-in.

Precision Leak Detection before Spill

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Pipe In Pipe Subsea Leak Detection Concept

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Via DTS techniques

Other technics/technologies possible

- DAS, VST, Electrical etc.

Linear Sensor

In Conduit

Outer Pipe

Inner Pipe

Annulus

Redundancy

© Omnisens 2014

Fiber Optic Monitoring

Subsea Flowlines

Dana DuToit

Omnisens S.A.

MTS Leak Detection Symposium

November 2014