OFFSHORE SURVEY IN DEVELOPMENT PROJECTS. Ian Douglas Head, Offshore Surveys, Shell Projects & Technology Europe
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1 OFFSHORE SURVEY IN DEVELOPMENT PROJECTS Ian Douglas Head, Offshore Surveys, Shell Projects & Technology Europe
2 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
3 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
4 EXPLORATION & APPRAISAL
5 CONCEPT SELECT Distribution of geology Proximity to infrastructure ` Geographic restrictions (legal, environmental, physical) Location of markets 5
6 CONCEPT SELECT ` 6
7 CONCEPT SELECT & FEED ROUTE SURVEY
8 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
9 THE HARDWARE Laybarge Survey Vessel Heavy Lift Barge Inshore Survey Vessels Rock Dumper Trenching Support Dive Support Vessel 9
10 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
11 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
12 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 Frigg/2 - approx. KP Frigg/1 - approx. KP Miller - approx. KP Britannia - approx. KP
13 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
14 P/L CROSSING PREPARATION A Work vessel or barge to place mat at required location: Vessel and mat positioning 14
15 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
16 SHORE PULL OF PIPELINE 16
17 PIPELINE ROUTING KP GOLDENEYE PLATFORM WATER DEPTH = 120m ST. FERGUS 17
18 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 WATER DEPTH 84m WATER DEPTH 79m ST. FERGUS 1 WATER DEPTH 29m 2 WATER DEPTH 58m 5 CROSSING OF 32 FRIGG/1 Approx. KP WATER DEPTH 84m 6 CROSSING OF 30 MILLER Approx. KP WATER DEPTH 89m 8 CROSSING OF 28 BRITANNIA Approx. KP WATER DEPTH 77m 18
19 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
20 WELDING OF PIPE FIELD JOINTS 20
21 P/L POSITIONING FOR CROSSING Note: Pipelay barge to place pipe at required location: Pipelay barge and pipe positioning 21
22 PIPE LAYING IN CURVES Barge Leaving Curve Pipe Design Route Barge Track Barge Enters Curve 22
23 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
24 PIPE LAYDOWN Note: Pipelay barge to place pipe end at required location: Pipelay barge and pipe-end positioning 24
25 PLOUGH PIPELINE KP GOLDENEYE PLATFORM (Not Installed) WATER DEPTH = 120m ST. FERGUS 4 SERVICE LINE TRENCHED to GOLDENEYE 25
26 LAUNCHING PLOUGH - PL2 Geomatics Foundation 26
27 BACKFILL PLOUGH - BPL2 27
28 PLATFORM INSTALLATION 28
29 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
30 PLATFORM TIE-IN WORKS INSTALL SPOOL, FLANGE PROTECTOR AND SSIV PROPOSED 20 SPOOLPIECE HYDROTEST PROPOSED 4 SPOOLPIECE 30
31 ROCK DUMPING Typical Rockdumping Vessel Rollingstone 31
32 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
33 AS-BUILT RECORDS Geomatics Foundation 33
34 Q + A 34
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