Jens Ditlev 08.11.2016

Experience and Examples from a typical Route Survey

DOF Subsea, Introduction

Subsea

DOF Subsea Atlantic Region

Bergen Aberdeen Oslo

DOF Subsea was established in 1979. Main office is located in Bergen, Norway.

Geoconsult, purchased by DOF ASA in May 2005, changed name to DOF Subsea

Norway in September 2007.

The company now has Offices in Bergen, Aberdeen, Luanda, Accra and Oslo (Semar).

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14Subsea

SAFE the RITE Way – Life Saving Rules

© DOF Subsea AS 2016. Information correct at time of going to press.

AssetsSubsea

Subsea

DOF Subsea Atlantic Personnel

Geophysicists

Geologists

Data Processors

Surveyors

Hydrographic Surveyors

Carthograpers

Technical drafters

GIS experts

ROV pilots

Cswip 3.4u Engineers/Coordinators

Engineers

Subsea

DOF Subsea Atlantic Fleet

Skandi Achiever Skandi Singapore Skandi Neptune Skandi Skansen

Diving Support Vessel

STX DSV06

Built - 2007

LOA - 105.9m

Breadth - 21.0m

Draught - 6.6m

Deck - 735m²

Offshore Crane - 140t

Accommodation - 100

Triton XLX WROV x 2

Portable LARS x 2

Air diving system - depth

rating 50 MSW

Saturation diving - depth

rating 350 MSW

Sat diving spread - 18

Diving Support Vessel

STX DSV06

Built - 2011

LOA - 107.1m

Breadth - 21.0m

Draught - 6.6m

Deck - 900m²

Offshore Crane - 140t

Accommodation - 100

Triton XLX WROV x 2

Portable LARS x 2

Air diving system - depth

rating 50 MSW

Saturation diving - depth

rating 350 MSW

Sat diving spread - 18

Construction Support Vessel

CONV MT6016

Built - 2001

LOA - 104.2m

Breadth - 24.0m

Draught - 6.3m

Deck - 1180m²

Offshore Crane - 250t

Accommodation - 106

Schilling UHD WROV x 2

Moonpool 7.2 x 7.2m

Mooring Installation Vessel

AH 04

Built - 2011

LOA - 107.2m

Breadth - 24.0m

Draught - 7.8m

Deck - 970m²

Deck Capacity – 1840t

Offshore Crane - 250t

Accommodation - 90

Schilling UHD WROV x 2

Moonpool 7.2 x 7.2m

Bollard Pull - 349t

A-Frame - 350t

Chain Locker 4 x 299m³

Shark Jaws 3 x 800t

Subsea

DOF Subsea Atlantic Fleet

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Geosund Skandi Seven Skandi Constructor Skandi Iceman

Light Construction Support

Vessel

UT 745

Built – 2001/2006

LOA - 98.5m

Breadth - 18.8m

Draught - 5.9m

Deck - 720m²

Deck Capacity - 1200t

Offshore Crane - 100t

Accommodation - 88

Schilling UHD WROV x 2

Moonpool 7.1 x 6.0m

Construction Support Vessel

STX OSCV 03

Built - 2008

LOA - 120.7m

Breadth - 23.0m

Draught - 7.0m

Deck - 1300m²

Deck Capacity - 3150t

Offshore Crane - 250t

Accommodation - 119

Triton XLX WROV x 2

Moonpool 7.2 x 7.2m

Light Construction Support

Vessel

SX121

Built - 2009

LOA - 120.2m

Breadth - 25.0m

Draught - 8.0m

Deck - 1470m²

Deck Capacity - 1600t

Offshore Crane - 140t

Accommodation - 100

Triton XLX WROV x 2

Moonpool 8.0 x 8.0m

Mooring Installation Vessel

VARD AH12

Built - 2013

LOA - 93.6m

Breadth - 24.0m

Draught - 7.8m

Deck - 780m²

Deck Capacity - 2300t

Accommodation - 45

Triton XLX WROV x 1

Bollard Pull – 280t

Chain locker 4 x 250m³

Shark Jaws x 800t

© DOF Subsea AS 2016. Information correct at time of going to press.

Survey PlatformsSubsea

Subsea

ROV

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DOF Subsea operates over 62 ROVs in its fleet

5 new ROVs on order

Work class ROV systems (UHD / Triton)

Inspection Class ROV Systems (Comanche and Tiger)

Most vessels have two dedicated built-in systems

2 AUVs (Kongsberg Hugin) for seabed mapping and inspection

2 FOCUS II ROTVs

Subsea

DOF Subsea ROV Fleet

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Seaeye Tiger Schilling HD Schilling UHD

Kystdesign Triton XL Triton XLX

Subsea

DOF Subsea AUVs & ROTVs

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AUV

ROTV

Route SurveyRequirements

Subsea 14

Desktop Study

Route Survey

UXO Survey

Clearance Survey

Prelay Survey

Geotechnical Survey

Cable Lay/Trenching

Cable detection survey

Capabilities

Geophysical Seabed Mapping

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• ROV Surveys

• INS on all survey projects since 2003

• Dual Head MBE, R2Sonic and Reson 8125

• Edgetech SSS/SBP, HD Video

• Advanced processing of INS and compilation of all

aquired data

• Delivery of all data in NaviModel and GIS

Geophysical Seabed Mapping

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• AUV operations

• Hugin 1000, 3000 meter depth capability

• Modular variable length mid section for batteries and

sensors.

• System Sensors: Kongsberg EM2040 MBE, Edgetech

2200 SSS/SBP, advanced forward looking Sonar,

Doppler Aided Navigation System, Digital Stills

camera.

• Terrain following and Collision Avoidance system.

• Pressure tolerant rechargeable Lithium-Polymer

Battery System.

• Mission Endurance 22 hours.

Deep Water Geohazard Lines

Continental Shelf

Continental Slope

Shelf Breakline

Slope Baseline

Pipeline/Cable Inspections

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• Using Dual Head MBE for better data coverage over

pipeline

• Use INS on all our ROV and ROTV operations to

achive better positioning data to improve the overall

data quality.

• System Sensors: R2Sonic 2024 MBE, Edgetech SSS,

Pipetracker, Doppler Aided Navigation System, HD

video.

• Processing solution NaviModel and Visualsoft.

• Project deliveries in NaviModel, Visualsoft and/or

SSDM GIS deliveries.

Structure Inspections

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• General Visual Inspection

• Close Visual Inspection

• Flooded Member Detection

• Marine Growth Measurement and Removal

• UT Testing

• Phase Ray/Eddy current Inspection of flexible flowlines

and gas lift lines

• Cathodic Potential Measurements with Stab and

Proximity equipment

• UV tracer leak detections

• Cswip personnel

Survey & Positioning Services

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• Typical Survey Services

• Construction support

• Subsea positioning

• Metrology - acoustic

• Metrology - theoretical

• 3D/4D Visualisation Software

• Rig move / structure tow out / installation

• Acoustic array installation

• Dimensional control Services

• Laser scanning

• Data processing

Example Project

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Pre-Lay Route Survey 2016

• Grapnel Hook to remove cables from route

• Gather detailed geophysical and video data from

the two centrelines using ROV mounted systems

(362km x 2 passes)

• Expand hairpin joint survey area with Hull based

MBE and SBP

• UXO survey and removal of potentially

hazardous targets within the corridor

• Geotechnical Sampling (CPT/Vibrocore)

DOF Subsea 22

DOF Subsea 23

DOF Subsea 24

DOF Subsea 25

Profile of Potential Wreck

DOF Subsea 26

DTM Image of Seabed

Depression with Anchors

DOF Subsea 27

MBE data showing

the relationship

between water depth

and bedform-size

DOF Subsea 28

MBE data example – morphology cross section of sandwaves

DOF Subsea 29

Internal Reflector within Sandwave Area

Isopach map with burial depth to internal reflector

DOF Subsea 30

Innovatum

Magnetometer/Gradiometer

DOF Subsea 31

Debris / Fishing Gear

DOF Subsea 32

Example of Observed

Trawl Scars

DOF Subsea 33

Slope Calculations, 1 meter contour lines

Gradient Images

DOF Subsea 34

SBP Example

DOF Subsea 35

SSS data example of

seabed collapse

structures

DOF Subsea 36

SBP data example of compressional structure related to collapse

structures from MBE data observed on the seabed

Thank you!