Drilling Services
Key specifications of our jackup rigs: To Drilling Services

The COSL 935 is a self-elevating(jack-up) mobile offshore drilling unit.Originally built as a slot-type drilling unit,the unit is being conveted to a cantilever type drilling unit. It holds CCS classification and is fully IMO compliance and certified. COSL has a proven track record in offshore drilling operations and assures its customers that our rigs will be operated according to stringent international and industry standards particularly in regards to Quality and HSE.

COSL 935
Design Criteria
Max/Min Operating Water Depth: 300/33 ft
Max Rated Drilling Depth: 20,000 ft
Storage Capacities
Fuel Oil: 608.9 m3
Lube oil: 8 m3
Drilling Water: 800 m3
Potable Water: 380 m3
Bulk Mud: 163.56 m3
Bulk Cement: 163.56 m3
Total of Active Mud and Reserve Mud: 345 m3
Main Dimensions
Length Overall£º 311'
Breadth Overall: 212'
Length of Hull: 213'
Breadth of Hull: 212'
Depth of Hull: 27'
Overall Length of Leg: 417 ft including Spud Cans
Number of Legs: 3
Type of Legs: Triangular
Heli-Deck Diameter: S-61
Max. Cantilever Combined Load: 2000kips
Living quarters: 106 persons
Maximum Gross Variable Load
Transit VL: 3924kips
Drilling VL: 5600kips
Survival VL: 3000kips
Jacking VL: 2645kips
Power Equipment
Main Diesel: Caterpillaer D399
Diesel Engines: 935KW x 5, 1200 rpm
Main Generators: 1162.5KVAx5, 60Hz,0.8pf
DC Drilling System: 5¡Á1500A
Drilling Equipment
Draw works: National 1320-UE
Derrick: 30¡¯¡Á30¡¯Sequare base derrick
Traveling Block: National £¬Inc.
Crown Block: National 760FA
Top Driver: MH PTD-500-AC
Rotary Table: National C-375
BOP Equipment
BOP Stack:  
BOP Control System: Koomey GARC-7
Accommodation
Company Representative¡¯s Office: 3
Contractor¡¯s Representative¡¯s Office: 1
Control Room: 1
Radio Room: 1
Helicopter Assembly Room: 1
Hospital / No of Beds 1/2
Accommodations:  
Number of single rooms:
2
Number of double rooms:
3
Number of four rooms: 6
Number of six rooms: 10
Number of eight rooms: 2
Toilets: 16
Showers: 20
Galley: 2
Recreation Room: 1
Changing Room: 2
Deck Crane
Crane: Two National H-65-A
One Marathon PCM-80-AS
Location: Port/Stb fwd/Stb Aft.
Boom Length: Two 85ft One 115ft
Block capacities and hoisting speeds:  
Load/Radius/Speed(min.radius): 18T/78o/NA
Jacking Systems and Rack chock system
Make/type: National supply co./400
No. of jacks or pinions: 48 units
Maximum normal jacking capacity: 400kips/units
Maximum preload jacking capacity: 497kips/units
Jacking speed: 1.0 ft/min
 
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