Vincent/Enfield Conductor and Flowbase Installation Review Roy Grant, TSMarine
Project scope Offshore installation Mobilised in Dampier (KBSB) on 10 October TSMarine scope is onshore project management and engineering followed by the offshore installation of the following Install 2 x 43m long 30 conductors in 360m water depth on Vincent Install 2 x 43m long 30 conductors in 550m water depth on Enfield 4 x flowbase installation on above conductors Spool metrology back to manifolds in both field locations
Project location Water depth at Vincent 360m msl Water depth at Enfield 550m msl 35km from Exmouth Peninsular
Havila Harmony
Havila Harmony Overview The Havila Harmony is a Multi Role Support Vessel, constructed to the proven Marin Teknikk MT 6010 design. The Havila Harmony was launched in 2005 with major upgrades undertaken before delivery to TSMarine in March 2007. Built to the new and demanding Clean Comfort V Norwegian standards the ship represents the latest in fuel efficient, low noise and vibration Dynamically Positioned Construction class vessels. Dimensions 93m overall length 20m breadth 8m depth main deck 11m depth shelter deck 6m max draft 800m 2 working deck area DP System (DP2) Kongsberg Simrad - SDP22 1 x Fanbeam Mk4.2 1 x HiPap 500 2 x DGPS 1 x Taut wire Moonpool 6.0 x 5.25m Speed / fuel consumption Max: 15 knots @ 30 Te/day Economical: 12 knots @ 24 Te/day DP: 7 10 Te/day Working capabilities Rigless intervention Subsea well abandonment Subsea production systems intervention Construction support ROV support and inspection Craneage 1 x 150Te offshore knuckle jib crane with active heave compensation 1 x ABAS 3Te @ 15m (deck) 1 x PALFINGER 1Te @ 3m (deck) 35te Heave Compensated deployment tower for Tree and Wireline Lubricator deployment Accommodation 86 persons ROV services 2 x Triton XLS 125Hp workclass ROV systems 3000m Depth Both systems have TMS
Expected weather: Oct-Nov Wind speed (mean 10min wind speed) October 8m/s (15.5knots) S SW direction November 8.1m/s (15.8knots) S SW direction Wave height (mean total significant wave height) October Hs = 2.0m November Hs = 1.7m Current (mean value taken from 5m above sea bed) October / November 0.17m/s (0.3knots) All data taken from Metocean Report dated 2 May 2006
Equipment installation limits Fast frame installation Deployment at 20 degrees to reduce DAF Conductor Make-Up on Deck Hs = 1.5m Operational Safety Limit Hs = 2.0m Wind Speed Conductor and Hammer Deployment Based on Deck Limit for Conductor Make-Up 20 knots Hs = 2.0m Flowbase installation Based on safe operation Hs = 2.5m Metrology Based on ROV launch operation Hs = 3.0m Wind Speed 30 knots
Installation tolerances Description Value Conductor centre position target box radius 2.0m Conductor inclination range +/- 1 Conductor heading +/- 7.5 WH elevation above seabed - target 3.7m + 0.1m /- 0.25m
IHC hammer spread S-200 Max energy/blow = 200kNm Min energy/blow = 10kNm Blow rate 45 blows/min Weight = 44Te (in air) / 30Te (in water) 12.1m long Hydraulic Power Pack (6m x 2.5m x 3.5m Weight = 19Te) Hydraulic Winch Reel (8m x 3.5m x 3.7m Weight = 33Te) Electrical Winch Reel (3.3m x 2.0 x 2.4m Weight = 3Te) 10 Control Container
36 Fast frame Supplied by IHC Height 4.15m Base dimension (9.2m x 9.2m) Mass 29.5Te in air (inc rigging) Opens via ROV hotstab Aligned with transponders mounted to frame Deployed at a 20deg angle
Conductor supply Pipe is 30 OD with varying WT of between 1 to 1.5 Connections are Oil States Leopard Connections Less than 1 turn for full make up No drive shoe is being installed internal soil plug 43m Wellhead Wt = 9.4Te EL = 11.62m Intermediate Joint 1.5 WT Wt = 6.5Te EL = 8.5m Conductor details Value Unit OD (max) 31.79 inch Total Weight (In air) 28.1 Te Total Weight (In water) 24.2 Te Length 43 m Intermediate Joint Wt = 6.5Te EL = 11.9m
Conductor supply To make the OD of the conductor constant, vertical strakes were welded to match the OD of the conductor connections (31.79 ) Strakes were only required on the first 3 sections of conductor due to F interface requirements Lift padeyes (42.5Te) were added to the WH joint Conductor Assembly suspended below hammer for subsea deployment Strakes required
Wellhead supply FMC Slim-line plate welded to wellhead Subsea Gyro installed/rem oved by ROV Lift Padeyes welded to wellhead Used for deck handling and deployment Receptacle bolted to slim-line plate once wellhead hung-off
Deck layout 2 x conductors and 2 x flowbases Hammer Spread Conductor Strings Hang-off Platform Flowbases Weatherford Container TSM Misc Equipment Fast Frame Fugro Equipment
Preparation activities Deploy LBL array Calibrate LBL Array
Offshore lift of fast frame
Measure the inclination using a subsea gyro Location of Gyro bucket
Conductor make-up on deck Lift first section of conductor with lifting tool and position at the hang-off platform
Conductor hang-off platform Positioned on port side aft of crane Hang-off level 3.6m above deck Used to hang-off each section of conductor prior to make-up 6.0m 9.6m 3.6m
Conductor make-up on deck Lower conductor section down to the hang-off platform and secure
Hang-off Clamp Hang-off Insert
Conductor make-up on deck Lift next section of conductor with lifting tool and position at the hang-off platform Stab into conductor on platform Make-up connection using tongs (hydraulically driven)
Conductor make-up on deck Lift sections of conductor, and lower down to the next hang-off Repeat process with wellhead housing joint
Hammer deployment Once wellhead is hung-off on platform, up-end hammer and position at hang-off platform Keeping weight of hammer on the crane, connect hammer to the conductor
Conductor deployment Lift hammer and conductor and deploy to depth Prior to stabbing conductor into Fast Frame confirm wellhead heading by alignment of painted markings Lower conductor through the Fast Frame (estimated self penetration is 4m 12m) ROV to check inclination Lower hammer until it sits on top of wellhead Slacken off crane wire Commence hammering (slow start => ramping up)
Conductor deployment When hammer is approximately 15m from seabed All stop Disconnect rigging between hammer and conductor ROV to open Fast Frame Continue to hammer conductor to depth
Conductor deployment
Conductor deployment Once conductor is at depth recover hammer to surface Reposition the Fast Frame, lifting with Fast Frame in open position ROV to confirm As-Driven wellhead height and inclination Close the Fast Frame and ready for next conductor Overboard and deploy to flowbase depth Install flowbase on wellhead Perform metrology from flowbase to manifold
Fast frame relocation Lift the Fast frame off the wellhead using the flat rigging with fast frame open Temporarily reposition fast frame Close fast frame Lift fast frame 10m off seabed and relocate to next conductor location along Safe Handling and Approach Zones
Permanent materials particulars Flowbase (Vincent) Value Weight (In air) 27.6 Te Dimensions 4.6m x 4.8m
Flowbase installation
Flowbase installation
Fast frame recovery
As-built conductor/flowbase installation Vincent
As-built conductor/flowbase installation Enfield
Spool metrology
Conductor installation All 4 conductors completed within tolerances: Inclination +/- 1 degree Heading +/- 5 degree Elevation +100mm / -150mm Followed by flowbase installation and metrology for pre-fabrication & installation of spool piece
Future conductor installation Lessons learned process Self leveling fast frame Optimised hammer capacity Potential of installation through moonpool Float-out of conductors Upending conductors off a barge Conductor storage method Racking system Vertical storage
Future conductor installation progress to date Fast frame design incorporating 360 degree vertical adjustment by ROV Optimised hammer capacity based on NWS soil data study Deep water hydro hammer development 2000m + Installation through moonpool via MPT Upending conductors off a barge
Multi purpose tower Conductor joint Reaction point and makeup level Lower restrain (deck level) 47
Client benefits Workscope allowed rig to remain on drilling activities Installation of flowbases and completion of metrology prior to well completion
Questions