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1GE © 2012 – All Rights Reserved
Unauthorised Reproduction Prohibited
Subsea Integrity Monitoring –
Naxys Acoustic Leak Detector
for major operator's deep water
project
GE Oil & Gas
Content
• Business Case• Recommended practice• Sensor coverage• Installation & Interface• Performance Leak Detection• Regulations• Condition Monitoring
CAPEX OPEX
INCENTIVE• Risk reduction• Reputation• Cost of lost production• Availability• Performance/production• OPEX• CAPEX
PUSH• Regulations• Polluter pays• Public• Insurance?
Subsea Leak Detection
4
DnV GL Recommended Proactice 2016
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Definitions cont.
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SUBSEA LEAK DETECTION
POINT SENSING LIMITED/LOCAL AREAWIDE AREA& Condition Monitoring
Direct contact with the
leaking medium is required.
Covers an extended area e.g.
entire subsea structure and
adjacent infrastructure
Limited detection range to
a few meters
NAXYS A10 deliveredsince 2006
NAXYS A3 deliveredsince 2010
NAXYS A1 deliveredsince 2014
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NAXYS A1 - POINT SENSOR
LEAKAGE
NAXYS A1 sensorSCM
NAXYS BATTERY SUPPORT MODULE ROV
LEA
KA
GE
SIZ
E
TIME
LEAKAGE TREND MONITORING:
LEAKAGE STATUS:
OK WARNING ALARM
Informed Decisions• Availability• OPEX
8
SUBSEA LEAK DETECTION
POINT SENSING LIMITED/LOCAL AREAWIDE AREA& Condition Monitoring
Direct contact with the
leaking medium is required.
Covers an extended area e.g.
entire subsea structure and
adjacent infrastructure
Limited detection range to
a few meters
NAXYS A10 deliveredsince 2006
NAXYS A3 deliveredsince 2010
NAXYS A1 deliveredsince 2014
9
TECHNOLOGY – SUBSEA SENSING
• One monitoring system for:
Subsea Leak Detection
Vibration Monitoring
Machinery and process monitoring
• Stand-alone & non-intrusive
LEAK DETECTIONEarly detectionWide area coverageDirectionalHigh sensitivity
VIBRATION DETECTION• Early detection• Structural, Flow lines, Riser
MACHINE & PROCESS MONITORING(Compressor, Pump, Transformer, …)
Acoustic & Electric monitoringContinuous & synchronous Early detection of changes/faults
LEAK DETECTION Early detection Wide area coverage Directional High sensitivity
NA
XY
S A
10
E
1010
GE © 2012 – All Rights ReservedUnauthorised Reproduction Prohibited
Installation & Interface
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A10 on Aasgard Subsea Compressor System
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Naxys A10 mounted on a manifold
FRAM H NORD MANIFOLD
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3 alternatives for mounting Naxys A10 onto a manifold
Landed onto any horizontal surface
having a footprint of 1 m diameter. Suitable for
retrofit installation by ROV.
Docking station (cross) pre-welded onto
subsea installation. Suitable for new
structures, installation dry or by ROV.
Docking station (guide post) pre-welded onto
subsea installation. Suitable for new
structures, installation dry or by ROV.
14
• Early warning
• User-friendly interface
•Status:
OKWarningAlarm
• Trend values
Download• Calibration
• Configuration
• Software updates
Field-proven
interface to major
system integrators
Naxys system overview
Status Message• Ethernet (SIIS Level 3)
RS485, CAN, IWIS,
Modbus/TCP, FTP, UDPIP
SCM
TOPSIDE
GE © 2014 – All Rights Reserved
A10 installed subsea and connected to the Subsea Control Module (SCM)
Battery Support Module
LeakDetector
A1, A5, A10, Sniffer
Vibration monitoringAksellerometer
Acoustic
Communcation interfaces and alarming:
Real time data through ROV, SCM or cable to surface
Acoustic communicationStorage
Pop-up buoy with satellitecommunication
NAXYS SUBSEA SUPPORT UNITPOWER, CONTROLS, DATA MANAGEMENT, DATA TRANSFER
POWER Battery power Externally powered
(e.g. from SCM)
COMMUNICATION, DATA PROCESSING & STORAGE Instrument power & communication interface (4-20mA, CanOpen,
RS485, Ethernet) Data processing (digitization, compression, etc) Storage of data Duty cycling control (user defined)
EXTERNAL DATA TRANSFER
& COMMUNICATION Through SCM Through ROV Realtime data Cable to surface
Acoustic communication to surface Pop-up buoy with satellite
communication Retrieval of module and transfer of
stored data
AUXILIARY INSTRUMENTS ACCELEROMETER LEAK DETECTOR CONDITION MONITORING PRESSURE SENSOR PIG DETECTOR SAND DETECTOR ANY OTHER SENSORS
Leak detection Performance
“During commissioning of the ALD units onOrmen Lange template A and B we saw animpressive ability to detect and determine thedirection of small and large simulated leakages”
Lars Kristian Asbjørnsen, Shell
FRAM H NORD MANIFOLD
NAXYS A10 – wide area coverage
DETECTION OF WATER INJECTION LEAKAGE TO SEA
Location of Naxys A10
Acoustic level
Warning and sector indication Sector 1
18GE © 2016 – All Rights Reserved
Unauthorised Reproduction Prohibited
No measurable impact of marine growth
19
Testing by SINTEF 2007
20GE © 2012 – All Rights Reserved
Unauthorised Reproduction Prohibited
The Activities Regulation (Norway)
§ 57 Remote measuring of acute pollutionThe operator shall establish a remote measuring system that provides sufficient information to ensure that acute pollution from the facility is quickly discovered and mapped so that the amount and spread can be determined.
Regulations, recommnedation and requirements
Short
respons time
Robust &
Long design life
(30 years)
Wide area
coverage
(>template)
Detects the source
(spatial detection)
Authority Requirements Naxys technology
Non-intrusive&
”Stand-alone”
It has recently been stated by the Norwegian authorities
in relation to future production in the Arctic region that
there is a need for “early warning system based on
detecting leaks at the source”
Inward Leak Detection
22GE © 2012 – All Rights Reserved
Unauthorised Reproduction Prohibited
Dual Use
Leak & Condition Performance Monitoring
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Detection of flow induced vibrations and choke cavitation
Naxys monitoring Pazflor pumps (Total Angola)
Sub-synchronous frequencies detected for one of the Pazflorpumps when running close to 3600 RPM
The movie shows frequency spectrum from pump number 1 recoded by Naxys ALVD #1 during a 10 minutes period.
When shaft speed is close to 60 Hz two peaks appear symmetrically around the shaft speed divided by two.
ALARM
WARNING
NORMAL
DETECTION OF ABNORMAL CONDITION
1) Shaft frequency (fs)
2) Shaft speed is increased
slightly causing…..
3) …..two peaks to appear
symmetrically around fs/2
RECOMMENDATION TO OPERATOR:
Avoid specific shaft speed close to 60Hz/3600
RPM causing sub-syncroneus vibrations
Click here to play video
“Detecting Sub-synchronous frequencies (SSF) noise is a very value feasibility of the Naxys acoustic system, because this is where a lot of mechanical troubles or Offset running condition manifest. SSF reveal a lot of fluid induced trouble/instabilities because the fluid is always rotating at approximately half of the rotating speed. So fluid excitations (and so system responses) are always at 0.5X and below. “
Pierre-Jean BIBET, TOTAL E&P - MPP Specialist, Senior Rotating Equipment Engineer.
To continue
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Feb 2008
April 2014
April 2015
October 2015
PUMP HARMONICS
MA
GN
ITU
DE
HARMONIC1st harmonic: - Related to pump imbalance- 2008: Low value, pump well-balanced
Clear 7th harmonic relatedto pump charachteristics
Significant increase in 1st harmonic INDICATES PUMP IMBALANCE
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Business case: Acoustic Monitoring of Subsea Pump
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a) No monitoring system to detect damaging pump condition. Operating with limited information
Damaging operation mode detected by Naxys monitoring system:Controlled operation of pump to non-damaging mode. Production reduced to 60%
Damaging operation mode not detected: Continued 100% production detoriates pump Severe damage
to pump Uninformed operation of pump continous to detoriate pump. 50% production
Unplanned pump trip
Unplanned mobilization of spare pump
Production regained
Planned mobilization of spare pump
Planned replacement of pump
Production regained
Production loss: $39.4 MM
Production loss: $13.7 MM
b) Naxys monitoring system detects damaging condition and provides information that supports pump operation
Assumptions:
Production 7000 bbl/day
Oil price: $50 per bbl.
$25.7MM saved by utilizing Naxys acoustic & electric monitoring for informed decision support
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