Scarabeo 5 is one of the best in class unit of its generation. The unit holds the ABS DP3 class notation, and it is fully compliant with Norwegian regulations. The unit can operates also “moored thruster assisted”, reducing fuel consumption and environmental impacts.
The rig is winterized and has been operating in subarctic environment for more than 20 years; it holds the ABS ICE CLASS IC notation.
Exploration and production drilling in harsh environment, design for easy conversion in early production and extensive well testing unit, template and christmas tree installation. 3,400 tons variable deck load in all conditions, under the most stringent codes.
Available thrust (8 thrusters x hi speed) = 327 tonnes equivalent to 5 knots current and 38 knots wind. SURVIVAL CONDITIONS Wave height 32 m, wind 41 m/s, current 1.6 m/s.
ABS A1 column stabilized drilling unit with the class notations AMS, ACCU, CDS(N), DPS3 ICE 1 C. AoC by NPD
Pontoon length 111 m; breadth 14.25 m; height 9.50 m Columns: square 10.80 m Spacing: longitudinal 35 m, transversal 58 m Main hull: length 80.80 m; breadth 68.80 m; depth 7.30 m Draft: operating 23.50 m; survival draft 21.50 m; transit 9 m Air gap: 13 m Displacement: operating 42,000 tons; transit 28,000 tons. Air conditioned living quarters for 106 people.
RIG STORAGE CAPACITIES
Pipe rack 750 sq.m; riser rack 710 sq.m; sacks 100 sq.m; containers 350 sq.m; covered
204 sq.m; liquid mud 490 cu.m; bulk and cement day tanks 160 cu.m in main hull. Barite/bentonite bulk tanks 320 cu.m; cement tanks 320 cu.m; liquid mud and brine tanks 600 cu.m; ballast tanks 2,700 cu.m in the columns. Drill water tanks 1,500 cu.m; fuel oil tanks 2,600 cu.m; potable water 720 cu.m; ballast water 18,400 cu.m in the pontoons. Subsea equipment Skidding system: Saipem-Aker Engineering. The skidding system is designed to enable easy and safe handling of subsea modules. It consists of 8 skidding structures having the capacity of 65 tons each that can be parked on open deck or skidded in two positions inside the BOP house for stack up of subsea modules. Total skidding area: 450 sq.m. Two pair of portable hydraulic cylinders with separate controls are dedicated for skidding of the units. Bumpers/guiding system: Saipem-Aker Engineering. 2 guiding bumpers are installed underneath the double bottom in order to enable easy and safe handling when running/pulling heavy subsea modules or BOP’s.
MARINE AND ENGINE
Eight thrusters, each driven by one 2,350 kw electric motor, total thrust 327 tons. Mooring system up to 900 m w.d., with eight points chain mooring; anchors 8 x 15 tons; 8 x 76 mm (3”) K4 chain, 2,150 m; four double windlasses (prepared for 84 mm K4 chain). Power generation 28,000 kw, produced by 8 units prepared for dual fuel system.
INTEGRATED MANAGEMENT SYSTEM
Totally integrated, thoroughly distributed process control and data acquisition system, based on proven hardware and LAN, with built-in simulation facilities and field configuration tool. Unprecedented system expandability, up to integration of comprehensive early production system.
• automatic power management
• fluid management, including stability calculation
• rig management such as drilling, logistic and safety
• automatic thruster assistance to mooring, including EMP dual redundant hydro-acoustic reference system; full D.P. class 3.
Cont. EMSCO C-3 3,000 hp, disk brake hydraulically operated
Cont. EMSCO FB-1600 Three triplex 1,600 hp each
Cont. EMSCO T-4950 Size 49 1/2”
Varco TDS-4 650 API T. electric, with PH 85 pipe handler
Cont. EMSCO RA-750 750 API T
TRAVELLING BLOCK CONTROL SYSTEM
SENSE Emergency stop system Ton-Miles indicator Twin stop. Travelling speed controller
BJ5750 750 API T
Cont. EMSCO LB-650 650 API T
Max. casing capacity: 650 tons Setback capacity: 350 tons
Dreco Derrick base 40 x 40 ft; height 170 ft Dynamic hookload 650 tons
Hydralift/NOV Lower racking arm 10 t SWL mod. T2004 - D1158 Upper racking arm 3 1/2” - 9 1/2” mod. T2005 - D1141 Synchronic system in/out with manual possibilities
Hydralift/NOV 143 stands 5 7/8” drill pipe aft. 88 stands 5 7/8” drill pipe forward 14 stands 9 1/2” drill collar forward
Halliburton 2008 A zone 2 HCS-25E. Advantage with 2 off Caterpillar 3406B engines driving 2 HT-400 triplex pumps. The pump 4” fluid ends are suitable for 15,000 psi maximum working pressure
NL Shaffer CM-25-600 DA Compensed load (max.) 270 tons Static load (max.) 750 tons Stroke 7.62 m
ACTIVE HEAVE COMPENSATOR
Maritime Hydraulic A.H.C. Dynacraft
ABB-SENSE Analogue instrumentation for standard drilling parameters Computerized drilling instrumentation and display system
NL Shaffer 120 K TWIN Eight 55 tons double units, 15.2 m line travel (tot. pull = 880 tons)
NL Shaffer 16 K Six 7.5 tons each
Ulstein Barite and bentonite storage tanks capacity 4 x 80 cu.m Daytanks 2 x 40 cu.m Cement storage tanks capacity 4 x 80 cu.m Daytanks 2 x 40 cu.m
Derrick 5 x mod. FLC-513 VE
Burgess MAGNA-VAC One, 1,000 g.p.m.
NOV PB Water Jet type, with 10” vent line to top of derrick and 5.95 m mud seal
CUTTING CLEANING SYS.
Drexel 8 tons/h capacity
Cameron 3” 15,000 psi H2S trim
Vetco Gray CSO 49 1/2” diverter housing with two 18” lines
Cameron 183/4” 15,000 psi guideline/ guidelineless w/Vetco H4-HD conn.
Cameron RF 21” x 63 ft joint, 55 ft stroke S.J.
B.O.P CONTROL SYSTEM
Cameron Latest Cameron Multiplex system with Simrad acoustic back-up complete with event logging Pod recovering feature in guidelineless
Italog Two, 80 ft long, equipped with production test lines
Maritime Hydraulics 280 tons
B.O.P. OVERH. CRANE
Maritime Hydraulics 2 x 40 tons
BASE PLATE TROLLEY
Maritime Hydraulics 90 tons
X-TREE OVERH. CRANE
Maritime Hydraulics 2 x 10 tons
Hagglund OP 6016 Twin: main hoist 60 tons 16 m 15 tons 46 m whip hoist 15 tons 49 m
Scoomi Oil Tool The rig is equipped with environmentally automatic mud pit cleaning system
The Scarabeo 5, based on Maritime Engineering design, is built as a column stabilized semisubmersible drilling vessel for world-wide operations and for harsh environments.
The main operational functions of the vessel are:
1. Exploratory drilling: thruster assisted mooring from 75 to 900 m w.d. dynamic positioned mode up to 2,000 m w.d.
2. Production drilling as per 1 above.
3. Designed for an easy conversion into an early production and extensive well testing unit (as per 1 above).
Scarabeo 5 has been conceived to cope with all main foreseeable future drilling/ production tasks. Very costly options, such as complete winterisation, have not been incorporated, but the necessary structural provisions have been made to convert the unit, if required.
RULES AND REGULATIONS
The Scarabeo 5 complies with all the latest rules and regulations. The unit is registered in Italy and, in addition to the Italian regulations, complies also with: Norwegian, Canadian, British and U.S. regulations.
HULL AND STRUCTURE
A simple basic structure, with minimum wind and current resistance and smooth surfaces of the upper hull to prevent build-up of ice, no vertical bracings to avoid icing and to facilitate possible entrance of barges betvween the columns to bring in heavy templates to be installed on the-seabed by the rig itself. No single main strength member, so that the reduction in strength of one single member will not be critical to the whole rig. All these features are intended to enhance the reliability and efficiency of the unit.
The rig systems are made with a high degree of redundancy. Systems have power supplies from redundant subsystems and may be controlled from alternative control stations. This arrangement reduces the possibility of total blackout and improves operability under emergency.
All piping, such as cooling water, fuel oil, ballast, service air are, as far as possible, routed clear of hazardous areas. Quality Assurance/Quality Control has been implemented throughout the design and the construction phases.
The accommodation module is made with structural fire protection according to the rules for units involved in oil production. This module has been designed as a “safe haven”, well protected from main risk areas and with sheltered escape ways to the meeting points for abandonment.
The platform is kept in position by eight anchors and eight thrusters. The dynamic positioning control system simulates continuously possible failures in the anchor/thruster systems in order to display the consequences of any failure to the position of the rig and the remedial options available.
8 THRUSTERS, FULL POWER:
2.5 m/s sea current & 19 m/s wind (5 knots & 38 knots) 2.25 m/s sea current & 27 m/s wind (4.5 knots & 54 knots) 2.0 m/s sea current & 32 m/s wind (4 knots & 64 knots)
CASE 2 (LOSING OF CORNER):
2.25 m/s sea current & 10 m/s wind (4.5 knots & 20 knots) 2.0 m/s sea current & 20 m/s wind (4 knots & 40 knots)
CASE 5 (WORST FAILURE CASE):
2.0 m/s sea current & 10 m/s wind (4 knots & 20 knots) 1.5 m/s sea current & 26 m/s wind (3 knots & 52 knots)
AUTOMATION AND RIG MANAGEMENT
The automation, control and management system is an integrated system based on computers. The system is connected to over 6,000 points in order to perform the following main functions:
• Automatic power management
• Fluid management, including stability calculation and ballast control
• Rig management, drilling, logistics and safety
• Environmental data monitoring
• Communication via data highways.
A failure mode and effect analysis and a combination of a fault tree analysis have been performed for the ballast system in order to:
• clarify all possible failures for combination of failures that may put the ballast system out of operation
• prove that no single failure will put the system out
• identify the most critical failure events (events chains)
• present a summary of the critical events.
The ballast system is designed to upright the rig within 2 hours in the event of major damage. There are 8 self-priming ballast pumps installed in 8 watertight compartments.
The main electrical system is built as a dual radial system, with four different voltage levels. “Dual system” means that it may be regarded as two completely independent systems, each powering 50% of the total capacity. The electrical main system is powered by 8 dieseldriven generators having a capacity of 4,800 KVA, 6,000 V, 60 Hz. each.
The drilling design-criteria enable the rig to drill up to 9,000 m in water depth up to 2,000 m. The drilling equipment is the latest state-of-the-art with semi-automatic drill pipe and casing handling. The large pipe rack area is suitable for storage and handling of 63 ft long riser joints.
The rig is designed for maximum efficiency and safety. All the latest requirements have been taken into account. The unit is able to work with the loss of anyone of the bracings and have sufficient stability to withstand loss of anyone of the columns or 2 damaged compartments. The design of the main hull has been made in such a way that escape ways within the working area and living quarters will not be affected. The Scarabeo 5 is made to incorporate all experiences gained from previous semisubmersible designs and the unit is developed to meet the most stringent requirements for world-wide drilling operations. The “functional availability” has been the leading basic design criterion so that all components, system and subsystems (electrical, mechanical, hydraulic) are considered and integrated in view of their specific, minimum vital contributions to any and all critical functions “available” to the unit. In other terms it is useless, and at times hazardous, to have, as in many P.C.D.A. applications, a hypertrophy of the computer components not matched by a comparable fault-tolerance of power, mechanical and hydraulic systems, equally essential to perform any action under computer control especially in emergency.