Aker H-6e

Aker H-6e – Riggen for ekstreme forhold”Ankerhåndtering og forflytning av innretninger”Stavanger 15. november 2006Knut B. Engebretsenpart of the Aker group

Aker H-6e Semi Submersible Drilling RigPresentation overviewH-6e General Rig DescriptionWhat is extreme about H-6e (e=extreme)?The DP systemThe mooring systemTransitMotion char. and model testConclusions1-Nov-06 Slide 2part of the Aker group© 2006 Aker Kvaerner

Aker H-6e Semi Submersible Drilling RigThe H-6erepresents today’sstate of the art200619993000 m WDDP Class 3POSMOOR ATADual Ram Rig1986Aker H-4.31974-1983 2000 m WDThrusters assistedmooredDual Activity Derrick● 37 units of H-3 and H-4design have been built.● 18 delivered from ownyards, the remaining builtby other yards on licenseAker H-4.2Aker H-3&3.21-Nov-06 Slide 3© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigHULL DIMENSIONSAker H-6ePontoon LengthBreadth PontoonsPontoon BeamPontoon HeightMain Deck LengthMain Deck BreadthColumns120 m77 m19,5 m10 m90 m70 m12,5 x 12,5 m, r=3,1mTopsides/Hullweight tDisplacement15.000/16.50065 300t, Operating Draft 23 m60 240t, Survival Draft 19m44 580t, Transit Draft 9,7m1-Nov-06 Slide 4© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigDesign:Registration:Classification:Water Depth:Drilling depth:Variable DrillingLoad:Diesel Generators:Thrusters:Mooring system:Living Quarters:Helicopter Deck:Lifeboats:Deck cranes:DP Drilling Vessel, Aker KværnerBahamas+DNV 1A1, Column Stabilized Drilling Unit (N), DRILL (N),HELDK, CRANE, E0, DYNPOS AUTRO, POSMOOR ATA3, 000 m10, 000 m7, 000 mt, transit, more in operation&survival.8 x 5 300 kW, 720 rpm, Rolls Royce8 x 4 500 kW, 800 kN bollard pull, variable speed, fixed pitch, Rolls Royce8 point anchor line system, 84 mm Stud Chain, 15 mT anchors Stevpris Mk5.Windlasses: 4 double winches , Aker Kværner Pusnes140 single bed cabins, extendable to 160, Leirvik Module Technology (LMT)Sikorsky S92 and S-61N, Superpuma AS332L2, EC225 and EH-101.Free fall type, 4 x 80 men, Norsafe2 ea, max capacity: 85 mt at 17 m, max reach 51m, Kenz Figee1-Nov-06 Slide 5© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigWorld’s biggest and mostadvanced drilling semiThe “e” stands for extreme■■■■■Depth: H-6e can drill and complete wellsin water depths ranging from 70 to 3,000m, well depth to 10,000 mOcean environment: Motioncharacteristics, freeboard and stationkeepingcapabilitiesDesign Temperature range: Winterizedwith cladding and heat tracing and alsoprepared with 4 addt’l chilled water unitsfor tropical conditionsPayload: Min. 7000 mt variable payloadDrilling efficiency: Dual RamRig forparallell drilling activities1-Nov-06 Slide 6part of the Aker group© 2006 Aker Kvaerner

H-6e FabricationDeck Elements• MostostalPomorze(Gdynia,Poland)• Energomontaz(Gdansk,Poland)• SchwartzHautmont(Terragona,Spain)Ram RigAker Kværner Maritime HydraulicsNorwayLiving QuartersLeirvik Module Technology(LMT), Stord, NorwayHullDubai Dry Docks(DDD)Assembly Aker Kværner Stord1-Nov-06 Slide 7© 2006 Aker Kvaernerpart of the Aker group

H-6e - RamRig principles• No derrick - only guiding frame• No traditional compensating equip.• No drawworks• No crown and travelling blocks• No drilline• No electro-magnetic brakeAux.RigMain Rig• Hoisting and compensation by useof the “rams” and a closed loophydraulic system1-Nov-06 Slide 8© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling Rig –Station-keeping system layout■ Layout showing● 8 Thrusters● 8 Mooring linesLine 6Line 7Line 5T6Port SideT7Line 8T5T8θT4T1Line 4T3YT2Starboard SideLine 1Line 3Line 21-Nov-06 Slide 9© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigZone 4T8FWDT1Zone 1T7T2T6ER 4 ER 3 ER 2 ER 1T3Zone 2T5T4Zone 3Segregation Electrical Power Generation, Distribution, and Thruster Systems1-Nov-06 Slide 10© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigEffect of worst single failure (loss of 2 thrusters)Loss of both thrusters in one cornerSelectedLoss of 2 thrusters diagonally1-Nov-06 Slide 11© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Lower Deck, EL 39. 0001-Nov-06 Slide 12© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e – Pontoon Plot Plan11 kV Power to Pontoon•Thruster VSD System (in8 pontoon compartments):•Transformer•Frequency converterand drive controller•Electrical motor(vertical, unidir. watercooled)=>Considerably lesscomplicated cablingcompared to diagonalsplit!1-Nov-06 Slide 13© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Thruster – Underwater mounting1-Nov-06 Slide 14© 2006 Aker Kvaernerpart of the Aker group

H-6e Electrical Loads Thrusters/Utilities and Drilling■ Operational Modes.● Single fault scenario => loss of all or any of:■ Two diesels in one engine room■ One main generator switchboard (11 kV)■ One main LV and LV distribution switchboard■ Two thruster drives (in one corner)■ Auxiliaries connected to same segregation zone● Maximum utilization of diesel-generator sets● Maximum utilization of thrusters● Transit● Drilling modes (normal and secure well)● Emergency● Survival● Harbour1-Nov-06 Slide 15© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigThruster capability - H6Operational condition (Wind = 30 m/s, Curr = 1.0 m/s)75 % Thruster force available29028027026030031033032004500 10340 350 204000303500403000502500602000150070100080500Environmental Forces090Intact thruster force100Single failure thruster force2501102401202302202102001901801701601401501301-Nov-06 Slide 16© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling RigThruster capability - H-6eSurvival condition (Wind = 37 m/s, Curr = 1.25 m/s)95% Thruster force available7000010 203040330 340 350 60003205000310503004000603000290200070280100080270090Environmental Forces260100Intact thruster force250240230220210200190180170140150160130120110Single failure thrusterforce1-Nov-06 Slide 17© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Typical El. Load scenario, Normal Operation1-Nov-06 Slide 18© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Typical El. Load scenario, Single failure1-Nov-06 Slide 19© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling Rig - transitMaximum forward speed in transit condition75% thruster effect(Environment including wind and corresponding waves and current)9.008.007.00Speed (knop)6.005.004.003.002.001.000.00Beaufort Wind Wave(1 hr, 10m) Hs(m/s) (m)5 10,8 3,66 13,9 4,47 17,0 5,28 20,6 6,69 24,2 8,010 28,3 10,011 32,4 11,512 36,5 13,05 6 7 8 9 10 11Beufort scaleSurvival draft=> Rig move by own propulsion recommended to this unit!1-Nov-06 Slide 20© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling UnitWindlass:Four double windlass units for 84 mm chain anchor lines(MBL=7200 kN) to be installed, one at each corner of the platformon the upper deck level. Each unit consists of :a) Two chain windlasses (cabelar units) with stalling capacity at2880 kN, dynamic braking capacity as per DNV POSMOORATA (N). Hydraulically operated band brakes with capacity asper DNV Rules.b) Tension gages and payout length counters are provided foreach line with interface with Vessel Positioning System.Motors:Each of the four windlasses to be driven by variable speed ACmotors with speed and torque controlled by frequency converters.Nameplate rating: 450kWRated voltage: 690VEnclosure (IEC): IP 56Insulation class: F1-Nov-06 Slide 21© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling Rig –Posmoor ATA■ The thruster assisted mooring system is designed according to DNVas specified for the POSMOOR ATA notation.■ For the Norwegian sector including the Barents Sea, the system hasto comply with NMD regulations.● DNV-OS-E301, Positioning mooring, October 2004● FOR 1987-09-04 nr 857, Forskrift omankring/posisjoneringssystemer på flyttbare innretninger● FOR 1994-02-10 nr 123, Forskrift for flyttbare innretninger medproduksjonstekniske installasjoner og utstyr● Bermuda/IMO MODU code, consolidated edition 2001, ref. /5/=> 8 x 84 mm R4 Mooring system without Thrusters capable ofwithstanding Beaufort 8 condition (wind up to 22 m/s) withoutexceeding offset 5% of water depth and intact safety factor (basedon 250 m water depth case).1-Nov-06 Slide 22© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Drilling UnitWind speed distributionHaltenbanken100.0 %90.0 %BF 7BF 8 BF 9Probability of non-exceedence80.0 %70.0 %60.0 %50.0 %40.0 %30.0 %20.0 %10.0 %0 5 10 15 20 25 30 35 40W ind spe ed (m/ s)1-Nov-06 Slide 23© 2006 Aker Kvaernerpart of the Aker group

H-6e Semi Submersible Drilling Rig –Estimated Fuel ConsumptionNormalaverage (noanchoring)Normalaverage(anchor)TransitCommentDrilling (MW) 8,5 8,5 0Utility (MW) 6 6 4Thrust (MW) 14,76 41 % trust normal average without anchors3,6 10 % trust normal average without anchors27 75 % trust average in transitPower consumed (MW) 29,26 18,1 31Fuel consumption (g/kWh) 183 183 183 Average for 50-100% loadFuel consumption (MT/day) 128,5 79,5 136,21-Nov-06 Slide 24© 2006 Aker Kvaernerpart of the Aker group

H-6e Model test by Marintek, Trondheim - Norway1-Nov-06 Slide 25© 2006 Aker Kvaerner100 year condition Hs 17,5 mpart of the Aker group

Model test cont.■ The following conditions were tested:● Survival● Transit● Transport■ Test conditions● 100 year North Atlantic seastates (DNV CN. 30.5)● 100 year wind conditions● 10 year current conditions● Environmental criteria for transit and transport■ The model test confirmed the following results relevant for thestation keeping● RAOs● Wind coefficients● Current coefficients● Overall behaviour in 6 degrees of freedom1-Nov-06 Slide 26© 2006 Aker Kvaernerpart of the Aker group

Motion comparison0.60Max vertical motion at drill floor(single amplitude)Vertical motion / Hs0.500.400.300.200.100.008.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0Tp (sec.)Aker H-6eAker H4-2Aker H3CS Other 30CS Rigs 451-Nov-06 Slide 27© 2006 Aker Kvaernerpart of the Aker group

Aker H-6e Semi Submersible Drilling Rig• Large payload and storage capacity• Excellent and proven motion characteristics• High drilling and completion efficiency• Zero harmful discharge to sea• Prepared for full winterization1-Nov-06 Slide 28part of the Aker group© 2006 Aker Kvaerner