ARCTIC S SEMI-SUBMERSIBLE DRILLING UNIT HUISMAN PRODUCT BROCHURE

Transcription

1 ARCTIC S SEMI-SUBMERSIBLE DRILLING UNIT HUISMAN PRODUCT BROCHURE

2 RCTIC S SEMI-SUBMERSIBLE DRILLING UNIT 1. DESCRIPTION 1.1 Unit general The Huisman designed Arctic S allows to operate at different drafts resulting in three main operating modes. The unique design combines the advantages of a conventional semisubmersible resulting in very low motions in waves and a heavily strengthened ice resistant unit when operating in ice at deep draft afloat. In third operating mode the unit acts as a gravity based structure. The Arctic S drilling unit is designed to drill wells in arctic conditions, moored in ice infested waters with ice thickness up to approximately meter. The unit consists of a round floater, eight columns and a round deckbox. When operating in ice the unit will ballast to ice draft (partly submerged deckbox) to protect the riser against level ice, rubble and ice ridges. The round conical shaped deckbox has a heavily strengthened structure at waterline level to deflect and break the ice. Station keeping in ice infested waters is achieved by a sixteen (16) point mooring system. The unit can operate in waterdepths between 35 and 1000m (115 and 3000ft). When no ice is present the unit operates at its operating draft as a conventional semi-submersible unit. The Arctic S is designed for year round operations in the Arctic. Depending on ice conditions, ice management can be required. For shallow water with water depths between 12 and 29.2m (40 and 96ft) the unit can be set on the sea bed. Therefore also the columns and the round floater are strengthened to withstand ice loads. Skirts are installed under the pontoon for increasing lateral resistance of the seabed. 2

3 The complete drilling system is enclosed to provide an acceptable working environment. Because of the integrated design of the BOP handling system, the substructure is flush with the main deck of the vessel. Materials can therefore be handled in a safe way. ARCTIC S ADVANTAGES Large drillers payload of 16000mt - efficiency Excellent ice resistance due to round conical shape of deckbox - workability Excellent motion characteristics when at open water draft - workability In shallow water unit can be set on the seabed - workability High mooring capacity utilising 16 point mooring system - workability Drill floor flush with main deck allowing safe and easy operations - safety Enclosed working and survival areas - safety, workability Heat tracing on exposed walk ways, stairs and handrails - safety 3

4 RCTIC S SEMI-SUBMERSIBLE DRILLING UNIT 1.2 Winterization The design of the unit includes the following low temperature features: Enclosed derrick and working areas (approx m 2 ); Enclosed lifeboats, life rafts and MOB boat, mooring windlasses and loading hose stations; Enclosed ROV areas and protected launching; Enclosed riser storage and pipe rack area; Heat tracing and snow covers on exposed escape ways; Heat tracing of exposed pipes, sealing of exposed doors and hatches; Heat tracing of all exposed stairs, walkways and helidecks; Insulation and/or heat tracing on all fluid piping which may freeze; Heating coils for exposed tanks; Thermal insulation of upper hull. Transversal Cross section, FR0 Furthermore the vessel is designed for zero spill and emissions to air according to Arctic requirements. 1.3 Accommodation The unit has accommodation for 200 persons in single and twin cabins. Further, the accommodation is outfitted with offices, changing rooms and laundry facilities, mess room, galley and provision stores, hospital, cinema, games room, library, internet room, gymnasium and saunas. 1.4 Power The unit will be fitted with two engine rooms. Each engine room is fitted with four engines. The unit will be fitted out with a vessel management system. Almost all equipment is AC electric driven. Power regeneration and high efficiency result in lower fuel consumption. Closed working areas 4

5 1.5 Motions Characteristics The Arctic S has excellent motion characteristics. The heave motion of the Arctic S is even better than the heave motion of a conventional semi-submersible. JBF (typical semi) Cylindrical Type Unit Model tests in irregular waves at open water operating draft Arctic S Model tests in irregular waves in survival condition meeting the wave H sig =17.4m Excellent seakeeping performance is confirmed by extensive model testing in a seakeeping tank for a similar, larger design. The tests are performed for operating, survival, transit and ice drafts. The motions were monitored. The sufficiency of airgap is verified. 5

6 RCTIC S SEMI-SUBMERSIBLE DRILLING UNIT 1.6 Ice resistence The investigation on the ice loads and the behaviour in ice is conducted in an ice tank for a similar larger design. The unit has been tested at two drafts. The tests at the operational ice draft provided the global ice loads necessary for the design of the mooring system. The tests at the transit draft allowed checking the feasibility of the transit in ice. Model tests in ice (ice draft and transit draft) 1.7 Mooring system A 16 point mooring system is utilized. On the vessel side 16 chain lines are provided. Depending on the water depth different pre-laid systems will be utilized. In shallow water the chain lines will be sufficient. In deeper waters polyester lines will be required for a chain/wire/chain configuration. 1.8 Drilling equipment Since the unit will operate in arctic conditions, the complete drilling system is enclosed to provide an acceptable working environment. The design of the drilling equipment set is new but it is based on proven components. The complete functioning package comprises: The mooring system is designed to withstand the forces from the drifting ice with thickness up to approximately m unbroken level ice. 2.4 million pound derrick system Vertical pipe handling gear, capable of handling 135ft stands Substructure with 1.28 million pound riser tensioning system Electric and hydraulic power and control systems Horizontal pipe handling gear (catwalk machines, pipe and riser overhead cranes) Skid systems, BOP overhead cranes and deck cranes 6

7 Efficiency The Drilling Equipment Set (DES) contains the drilling system. The system has dual drawworks allowing transferring of the drill line from one drum to the other eliminating slip-cut procedures, saving several hours each time the wire would normally be cut. The system has splittable blocks on the travelling block. The splittable blocks allow push button reeving change from 16 to 12, 8 or 4 falls when handling lighter loads, increasing the block speed and the effective stroke of the passive heave compensation cylinders. Because of the design of the BOP handling system, the substructure can be flush with the main deck of the vessel, approximately 15m lower than on a conventional semisubmersible. The reduced height of the substructure lowers the centre of gravity. Safety Since the drill floor and catwalks are flush with the main deck, materials can be handled much safer. Most machinery (drawworks, heave compensators etc.) is located inside the enclosed derrick providing a safe and protected area for maintenance. Redundancy The complete system is designed with an extreme high redundancy: Dual drawworks, allowing 100% load to be handled at half the speed with one drawworks drum out of order. Dual Passive Heave Compensator cylinders, allowing 100% load to be compensated at half the stroke with one cylinder blocked. Active Heave Compensation with Passive Heave compensation as backup. Four pipe rackers, providing redundant pipe handling. Electrical and hydraulic power units split into two sections and fed from two vessel switchboards, securing power at all times. Redundant PLC and SCADA network. EQUIPMENT ADVANTAGES The system has dual drawworks allowing transferring the drill line from one drum to the other eliminating slip-cut procedures - time saving When one of the Dual drawworks drums is out of order, the full load can still be hoisted although at half the speed - redundancy The system has Active Heave Compensation on the drawworks as well as Passive compensation with Hydraulic cylinders - efficiency, redundancy The system has splittable blocks on the travelling block allowing push button reeving change from 16 to 12, 8 or 4 falls when handling lighter loads, increasing the block speed with a factor of maximal 4 - time saving The system has four pipe rackers and a large setback - redundancy, efficiency 7

8 RCTIC S SEMI-SUBMERSIBLE DRILLING UNIT 1.9 Integrated control system An in-house developed integrated control and monitoring system ensures trouble free operation of the rig. This means full control of all equipment from a single control system without any third party interfaces. The drilling system is controlled mainly from the driller s cabin and the aft driller s cabin. However, in case of malfunction of the control system, most equipment can be controlled manually as well. The control system consists of the following main components: Drillers cabin interior Central PLC Remote Input/Output stations Operator chairs and SCADA screens All regularly used controls, switches and joysticks are located on the operator control chairs. To keep the control chairs as simple as possible, the readout of process-measured values, status, warning, alarms and job dependent settings are incorporated in the SCADA system. The control system is prepared for a satellite/telephone modem connection for service engineers to log on to the system from the office. This utility can be used for providing real time drilling data to the office, troubleshooting, software updates, and for remote service assistance from Huisman s engineers. The layout of the control system links all devices to one single network which is connected to the satellite / telephone modem. To ensure safe operation, the connection to the rig uses a secure VPN tunnel. Included in the control system is the Huisman Geolograph. This system is used during drilling and evaluation of the drilling data. The system is developed with the following features: Monitoring of all relevant drilling parameters on the rig Exporting of drilling data in Excel format for in-depth evaluation enabling the driller and the company man to make decisions during critical operations Integration with the rig control system, making use of the sensors already present. FEATURES Complete control system from single supplier Equipment outfitted with local backup controls Remote access and troubleshooting Huisman Geolograph included 8

9 2. TECHNICAL SPECIFICATION 2.1 Unit GENERAL Maximum GENERAL water depth (open water) 1000 [m] 3280 [ft] Maximum water depth (ice infested water) 500 [m] 1640 [ft] Maximum water depth (sitting on the seabed) 29.2 [m] 95.8 [ft] Max. drilling depth from water line [m] [ft] Classification ABS: ÀA1 Column Stabilized Drilling Unit Á ÀAMS ÀACCU CDS HELIDK CRC Ice Class PC 4 MAIN DIMENSIONS Deckbox top diameter 88.0 [m] [ft] Draught operational (ice) 29.2 [m] 95.8 [ft] Deckbox bottom diameter 77.2 [m] [ft] Draught operational (open Deckbox height 14.9 [m] 48.9 [ft] water) 18.5 [m] 60.7 [ft] Column length 12.8 [m] 42.0 [ft] Draught survival 17.0 [m] 55.8 [ft] Column width 14.4 [m] 47.2 [ft] Draught transit 10.3 [m] 33.8 [ft] Lower hull outer diameter [m] [ft] Lightweight [mt] [st] Lower hull width 26.0 [m] 85.3 [ft] Displacement at transit Lower hull height 10.8 [m] 35.4 [ft] draught [mt] [st] Height of main deck above Displacement at operational base line 38.5 [m] [ft] open water draught [mt] [st] Deck area 2500 [sq m] [sq ft] Displacement at operational ice draught [mt] [st] MARINE SYSTEMS Main engines 8 x [emw] 8 x 2450 [ehp] Total installed engine power 14.6 [MW] [HP] No. of independent engine rooms 2 [-] Marine diesel oil tanks 4600 [cu m] [bbl] Fresh water tanks 2000 [cu m] [bbl] Drill water tanks 2800 [cu m] [bbl] No. of ROV s 1 [-] Complement in one and two person cabins 200 [-] Helicopter deck (1x), max. type helicopter S-92, EH101 or similar PAYLOAD VDL operational (incl. drilling fluids in pontoon, but excl. consumables and mooring chain) [mt] [st] Transit payload (incl. drilling fluids in pontoon, but excl. consumables and mooring chain) 3500 [mt] 3858 [st] Mooring chain (16 x 300m / D = 102mm) 1600 [mt] 1764 [st] Mud tanks (pontoon) 2200 [cu m] [bbl] Brine / Base oil tanks 2000 [cu m] [bbl] Bulk silos 820 [cu m] [cu ft] Bulk in sacks 9000 [sacks] 9

10 RCTIC S TECHNICAL SPECIFICATION 2.2 Drilling Equipment DOUBLE DRILLING TOWER Static hook load 1090 [mt] 2400 [kips] Clear height (under crown) Free lifting height (under topdrive) 61 [m] 48.0 [m] 200 [ft] 157 [ft] Stand length minimal, quad RII, 4 x 30 [ft] Stand length maximal, triple RIII, 3 x 45 [ft] Min. Max. 119 [ft] 141 [ft] Overall height above main deck 66 [m] 217 [ft] Power draw works Power top drive HEAVE COMPENSATION Max. capacity compensation system Max. compensation stroke (AHC), 8 falls 550 [mt] Based on regular waves with 15 [sec] period Max. compensation stroke (PC), 8 falls 550 [mt] PIPE HANDLING SYSTEMS Max. capacity total Size of drill pipe Size of casing or drill collar Total length of drill pipe, triple RIII Total length of casing, triple RIII SUBSTRUCTURE Height of drill floor above main deck (flush) Rotary table internal diameter Iron roughneck, type AR5000, max. torque RISER TENSIONERS No. of riser tensioners Total installed capacity Max. total operation capacity Maximum stroke on wire SKID CARTS Moonpool skid cart hang off capacity Capacity SSBOP overhead crane Capacity X-mas tree skid cart 4600 [kw] 860 [kw] 1090 [mt] 7.0 [m] 6.0 [m] 950 [mt] 3 1/2 up to 5 up to [m] 2880 [m] 0 [m] 1536 [mm] [Nm] 8 [-] 580 [mt] 457 [mt] [m] 400 [mt] 400 [mt] 80 [mt] 6160 [HP] 1150 [HP] 2400 [kips] 23 [ft] 19.7 [ft] 2100 [kips] 6 5/8 [inch] 14 [inch] [ft] 9450 [ft] 0 [m] 60.5 [inch] [ft*lbs] 1280 [kips] 1008m [kips] 50 [ft] 880 [kips] 880 [kips] 176 [kips] 10

11 2.3 Well control equipment SUBSEA BOP Internal diameter Pressure rating Number of ram preventers Number of annular preventers Control system MARINE DRILLING RISER Diameter main tube Outer diameter buoyancy Depth rating 1034 [bar] 6 [-] 2 [-] MUX type 1270 [mm] 1220 [m] 18 3/4 [inch] [psi] 21 [inch] 50 [inch] 4000 [ft] Riser joint length Number of joints simultaneous on board [m] 48 [-] 75 [ft] Stroke telescopic joint Outer diameter telescopic joint CHOKE AND KILL MANIFOLD Pressure rating Number of chokes DIVERTER Diverter housing internal diameter Diverter internal diameter Diverter pressure rating Outlet ball valves size 2.4 Mud system MUD SYSTEM Gumbo box Number of shakers (one mud cleaner) Number of degasser [m] 1499 [mm] 1034 [bar] 2 remote, 2 manual 1536 [mm] 540 [mm] 69 [bar] 406 [mm] 1 [-] 6 [-] 2 [-] 65 [ft] 59 [inch] [psi] 60.5 [inch] 21 1/4 [inch] 1000 [psi] 16 [inch] Mud treatment tanks, total volume (7 tanks) Active mud tanks, total volume (10 tanks) Reserve mud tanks, total volume 256 [cu m] 850 [cu m] 2400 [cu m] 1600 [bbl] 5100 [bbl] [bbl] Number of mud pumps Mud pump power (each) Mud pump pressure 4 [-] 1640 [kw] 520 [bar] 2200 [HP] 7500 [psi] Dual stand pipe manifold pressure rating Cement manifold pressure rating 517 [bar] 1034 [bar] 7500 [psi] [psi] Note: Specifications might be subject to changes as the design progresses 11

12 HUISMAN EQUIPMENT BV Admiraal Trompstraat HH Schiedam P.O. Box AD Schiedam The Netherlands Harbour no. 561 Phone: +31 (0) Fax: +31 (0) info@huisman-nl.com