OFFSHORE SURVEY IN DEVELOPMENT PROJECTS Ian Douglas Head, Offshore Surveys, Shell Projects & Technology Europe
THE PROJECT: GOLDENEYE GOLDENEYE FACTS ST. FERGUS GOLDENEYE PLATFORM 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 Geomatics Foundation 2
TIMELINE 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 Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Year 11
EXPLORATION & APPRAISAL
CONCEPT SELECT Distribution of geology Proximity to infrastructure ` Geographic restrictions (legal, environmental, physical) Location of markets 5
CONCEPT SELECT ` 6
CONCEPT SELECT & FEED ROUTE SURVEY
CONSTRUCTION OPERATIONS 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 8
THE HARDWARE Laybarge Survey Vessel Heavy Lift Barge Inshore Survey Vessels Rock Dumper Trenching Support Dive Support Vessel 9
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 ROV visual surveys 10
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 11
PRE-LAY PREPARATIONS 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. 12
TYPICAL PIPELINE CROSSING Plan of Pipeline Crossing SLEEPER TYPE LOAD SPREADING MATTRESSES SEGMENTED CONCRETE MATRESSES Elevation of Pipeline Crossing MEAN SEABED LEVEL Mattresses SLEEPER TYPE LOAD SPREADING MATTRESSES SEGMENTED CONCRETE MATRESSES 13
P/L CROSSING PREPARATION A Work vessel or barge to place mat at required location: Vessel and mat positioning 14
PIPE LAYBARGE - CASTORO SEI 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 Main Features Semi automatic welding system Self propelled vessel Certified with NMD, HSE Letter of Compliance 12 point mooring system & thruster assistance 15
SHORE PULL OF PIPELINE 16
PIPELINE ROUTING KP 101.2 GOLDENEYE PLATFORM WATER DEPTH = 120m ST. FERGUS 17
PIPELINE ROUTING NEAR SHORE SECTION WATER DEPTH 79m 9 CROSSING OF 36 FLAGS BRENT Approx. KP 8.72 WATER DEPTH 59m CROSSING OF 32 FRIGG/2 Approx. KP 13.42 WATER DEPTH 84m WATER DEPTH 79m 3 4 7 ST. FERGUS 1 WATER DEPTH 29m 2 WATER DEPTH 58m 5 CROSSING OF 32 FRIGG/1 Approx. KP 13.60 WATER DEPTH 84m 6 CROSSING OF 30 MILLER Approx. KP 14.63 WATER DEPTH 89m 8 CROSSING OF 28 BRITANNIA Approx. KP 17.16 WATER DEPTH 77m 18
SET UP AND LAY AWAY PIPELINE START-UP ST. FERGUS KP -0.2 WATER DEPTH = M.L.W.S. 10-B 11-B 12-B 1-B 2-B 3-B 4-B 5-B PROPOSED WINCH SITE 9-B ST. FERGUS 7-B 6-B 19
WELDING OF PIPE FIELD JOINTS 20
P/L POSITIONING FOR CROSSING Note: Pipelay barge to place pipe at required location: Pipelay barge and pipe positioning 21
PIPE LAYING IN CURVES Barge Leaving Curve Pipe Design Route Barge Track Barge Enters Curve 22
PLATFORM APPROACH PROPOSED 20 SPOOLPIECE PROPOSED 4 SPOOLPIECE 20 EXPORT LINE LAYDOWN 4 SERVICE LINE LAYDOWN GOLDENEYE PLATFORM (Not Installed) WATER DEPTH = 120m Geomatics Foundation 23
PIPE LAYDOWN Note: Pipelay barge to place pipe end at required location: Pipelay barge and pipe-end positioning 24
PLOUGH PIPELINE KP 101.2 GOLDENEYE PLATFORM (Not Installed) WATER DEPTH = 120m ST. FERGUS 4 SERVICE LINE TRENCHED to GOLDENEYE 25
LAUNCHING PLOUGH - PL2 Geomatics Foundation 26
BACKFILL PLOUGH - BPL2 27
PLATFORM INSTALLATION 28
PLATFORM TIE-IN WORKS PROPOSED 20 SPOOLPIECE PERFORM METROLOGY FOR 20 & 4 SPOOLS AT PLATFORM PROPOSED 4 SPOOLPIECE GOLDENEYE PLATFORM (Installed) WATER DEPTH = 120m 29
PLATFORM TIE-IN WORKS INSTALL 20 + 4 SPOOL, FLANGE PROTECTOR AND SSIV PROPOSED 20 SPOOLPIECE 20 + 4 HYDROTEST PROPOSED 4 SPOOLPIECE 30
ROCK DUMPING Typical Rockdumping Vessel Rollingstone 31
ROCK DUMP - CROSSINGS Plan of Pipeline Crossing SLEEPER TYPE LOAD SPREADING MATTRESSES SEGMENTED CONCRETE MATRESSES PIPE TOUCH DOWN POINT PIPE TOUCH DOWN POINT TYPICAL LIMIT OF FINAL ROCK DUMP Elevation of Pipeline Crossing ROCK DUMP MEAN SEABED LEVEL Mattresses SLEEPER TYPE LOAD SPREADING MATTRESSES SEGMENTED CONCRETE MATRESSES 32
AS-BUILT RECORDS Geomatics Foundation 33
Q + A 34