OFFSHORE SURVEY IN DEVELOPMENT PROJECTS

Ian Douglas

Head, Offshore Surveys,

Shell Projects & Technology Europe

GOLDENEYEPLATFORM

ST. FERGUS

GOLDENEYE FACTS

• Gas Condensate Field

• Located in Outer Moray Firth, only 100km NE of St Fergus Gas Terminals

• Low safety risks due to normally unmanned operations offshore

• Total lifetime production expected to be in excess of 500 Billion scf Gas and 17 Million barrels Condensate over a 10 Year period

• Greatest water depth (120 metres) in which a Jack-Up rig will be used for production well drilling

THE PROJECT: GOLDENEYE

Geomatics Foundation

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TIMELINE

Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Year 11

Exploration seismic Acquisition

Interpretation

Exploration Drilling

Appraisal

Final Investment Decision

Concept Select

Route Survey & Site Investigation

Front End & Detailed Design

Offshore Construction

Development Drilling

Production Start Up

EXPLORATION & APPRAISAL

CONCEPT SELECT

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Proximity to infrastructure

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Location of marketsGeographic restrictions (legal, environmental, physical)

Distribution of geology

CONCEPT SELECT

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CONCEPT SELECT & FEEDROUTE SURVEY

� Pre-Award Survey Input

� Pre-Construction Survey Activities

� Pipelay – Shore Pull – Near shore / Offshore Operations

� Trenching

� Backfilling

� Tie-In & Pre-Commissioning Works

� Rock dumping – Crossings and Pipeline Protection

� Platform Installation

� Drilling Phase

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CONSTRUCTION OPERATIONS

Laybarge Heavy Lift Barge

Rock Dumper Trenching Support

Survey Vessel

Inshore Survey Vessels

Dive Support Vessel

THE HARDWARE

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PRE-INSTALLATION SURVEY

Ensures route / site is free of

obstructions

Side Scan Sonar and MBES

ROV centre line / site visual survey

� Digital Terrain Model

� Route Topography Analysis

� Array visibility Analysis

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ROV visual surveys

SURVEY SUPPORT FOR CONSTRUCTION OPS

� Pipelay Barge Navigation

� Tug Management

� Shore Pull

� Pipeline crossing

� Pipe lay down

� Trenching & Backfill for service line

� Heavy lift vessel positioning

� Acoustic positioning USBL or LBL of

structures

� EDM (Total Station) positioning of

structures

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Landfall Preparation & Plant Construction

Pre-Lay Survey – Onshore, Inshore & Offshore

Liaison with local stakeholders e.g. fishermen

3rd Party Agreements

Crossing Construction

� 36” Flags Brent - approx. KP 8.72

� 32” Frigg/2 - approx. KP 13.42

� 32” Frigg/1 - approx. KP 13.60

� 30” Miller - approx. KP 14.63

� 28” Britannia - approx. KP 17.16.

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PRE-LAY PREPARATIONS

Elevation of Pipeline Crossing

Plan of Pipeline Crossing

MattressesSLEEPER TYPE LOADSPREADING MATTRESSES SEGMENTED CONCRETE

MATRESSES

SEGMENTED CONCRETEMATRESSES

SLEEPER TYPE LOADSPREADING MATTRESSES

MEAN SEABED LEVEL

TYPICAL PIPELINE CROSSING

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P/L CROSSING PREPARATION

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A Work vessel or barge to place “mat” at required location: Vessel and mat positioning

� Semi submersible pipelay barge

� Deep & shallow water capability with dedicated pipelay ramp

� Dual lay and piggyback lay capabilities

� Large diameter pipelay capability

� Lay rate up to 7km/day

� Semi automatic welding system

� Self propelled vessel

� Certified with NMD, HSE Letter of Compliance

� 12 point mooring system & thruster assistance

Main Features

PIPE LAYBARGE - CASTORO SEI

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SHORE PULL OF PIPELINE

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ST. F

ERG

US

KP101.2

GOLDENEYEPLATFORM

WATER DEPTH = 120m

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PIPELINE ROUTING

ST. F

ERG

US

WATER DEPTH 79m

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CROSSING OF28” BRITANNIAApprox. KP 17.16

WATER DEPTH 77m

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WATER DEPTH 79m

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CROSSING OF30” MILLER

Approx. KP 14.63WATER DEPTH 89m

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CROSSING OF32” FRIGG/1

Approx. KP 13.60WATER DEPTH 84m

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CROSSING OF32” FRIGG/2

Approx. KP 13.42WATER DEPTH 84m

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CROSSING OF36” FLAGS BRENT

Approx. KP 8.72WATER DEPTH 59m

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WATER DEPTH 58m

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WATER DEPTH 29m

1

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PIPELINE ROUTING – NEAR SHORE SECTION

11-B 12-B 1-B2-B

3-B

5-B

6-B

7-B

9-B

10-B

4-B

PIPELINE START-UPST. FERGUS

KP -0.2WATER DEPTH = M.L.W.S.

ST. F

ERG

US

PROPOSEDWINCH

SITE

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SET UP AND LAY AWAY

WELDING OF PIPE FIELD JOINTS

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P/L POSITIONING FOR CROSSING

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Note: Pipelay barge to place “pipe” at required location: Pipelay barge and pipe positioning

PIPE LAYING IN CURVES

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Pipe Design Route

Barge Track

BargeLeavingCurve

BargeEntersCurve

PROPOSED20” SPOOLPIECE

PROPOSED4” SPOOLPIECE

4” SERVICE LINE LAYDOWN

20” EXPORT LINELAYDOWN

GOLDENEYEPLATFORM

(Not Installed)

WATER DEPTH = 120m

Geomatics Foundation

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PLATFORM APPROACH

PIPE LAYDOWN

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Note: Pipelay barge to place “pipe end” at required location: Pipelay barge and pipe-end positioning

ST. F

ERG

US

KP101.2

4” SERVICE LINETRENCHED to GOLDENEYE

GOLDENEYEPLATFORM

(Not Installed)

WATER DEPTH = 120m

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PLOUGH PIPELINE

LAUNCHING PLOUGH - PL2

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Geomatics Foundation

BACKFILL PLOUGH - BPL2

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PLATFORM INSTALLATION

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PROPOSED20” SPOOLPIECE

PROPOSED4” SPOOLPIECE

PERFORM METROLOGY FOR 20” & 4” SPOOLS AT PLATFORM

GOLDENEYEPLATFORM(Installed)

WATER DEPTH = 120m

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PLATFORM TIE-IN WORKS

PROPOSED20” SPOOLPIECE

PROPOSED4” SPOOLPIECE

INSTALL 20” + 4” SPOOL, FLANGE PROTECTOR AND

SSIV

20” + 4”HYDROTEST

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PLATFORM TIE-IN WORKS

Typical Rockdumping Vessel – Rollingstone

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ROCK DUMPING

TYPICAL LIMIT OFFINAL ROCK DUMP

ROCK DUMP Elevation of Pipeline Crossing

Plan of Pipeline Crossing

MattressesSLEEPER TYPE LOADSPREADING MATTRESSES SEGMENTED CONCRETE

MATRESSES

PIPE TOUCHDOWN POINT

PIPE TOUCHDOWN POINT

SEGMENTED CONCRETEMATRESSES

SLEEPER TYPE LOADSPREADING MATTRESSES

MEAN SEABED LEVEL

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ROCK DUMP - CROSSINGS

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Geomatics Foundation

AS-BUILT RECORDS

Q + A

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