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

The Bohai #4 J/U is owned by China Oilfield Service Limited Company (COSL), it was a slot type self-elevating jack-up rig when it was built in 1977 in Japan by Hitachi Zosen Shipyard. It was a non-propeller jack-up drilling rig. It was classified as *AI by A.B.S (American Bureau of Shipping) and also approved by CCS (China Classification Society). The rig was converted to a cantilever type jack-up rig during late 1998 and completed the conversion by early April of 1999 at Dalian Shipyard of PRC. We provide the first class offshore drilling/workover/support services.

BOHAI ¢ô
Design Criteria
Max/Min Operating Water Depth: 300/30 ft
Max Rated Drilling Depth: 20,000 ft
Storage Capacities
Fuel Oil: 28579.5 ft3 (808.8 m3)
Lube oil: 141.34 ft3 (4 m3)
Drilling Water: 30441.7 ft3 (861.5 m3)
Potable Water: 13332.16 ft3 (377.3 m3)
Bulk Mud: 5922.54 ft3 (167.6 m3)
Bulk Cement: 5922.54ft3 (167.6 m3)
Heavy Mud Accepted: 314.48 ft3 (8.9 m3)
Total of Active Mud and Reserve Mud: (350.9 m3)
Sack Storage: 4000(sacks)
Main Dimensions
Length Overall£º 287¡¯-11¡± (87.78 meters)
Breadth Overall: 212-0¡±¡¯ (64.618 meters)
Length of Hull: 213'-0" (64.9 meters)
Breadth of Hull: 212'-0" (64.618 meters)
Depth of Hull: 27'-0" (8.23 meters)
Overall Length of Leg: 417¡¯-4¡± including Spud Cans
Number of Legs: 3
Type of Legs: Independent/Triangular
Heli-Deck Diameter: 72'-10"x 72'-10"
Max. Cantilever Combined Load: 1380 kips at 45ft/0ft
630 kips at 45ft/12ft
Living quarters: 99 persons per UK HSE
Maximum Gross Variable Load
Transit VL: 4563.7kips (2281.85t)
Drilling VL: 5653.72kips (2826.86t)
Survival VL: 2353.72kips (1176.86t)
Jacking VL: 4563.7kips (2281.85t)
Power Equipment
Main Diesel: Caterpillar 3516
Diesel Engines: 1615HP x 4, 1200 rpm
Main Generators: 1500KVAx4, 60Hz,0.8pf
SCR System: 5.SET 0-750VDC
Drilling Equipment
Draw works: National 1320-UDBE
Derrick: WCI 160¡¯X30¡¯X14¡¯
Traveling Block: WCI 2215-754T, 7x60
Crown Block: WCI 18215-743T, 8x60
Top Driver: Varco TDS-8SA
Rotary Table: National C-375
BOP Equipment
BOP Stack: One Set Varco Shalfer 13-5/8" 10K
One Set Hydril 21-1/4¡± 2K BOP Stack
BOP Control System: NL-Koomy T20150 control System
Accommodation
Company Representative¡¯s Office: 1
Contractor¡¯s Representative¡¯s Office: 1
Control Room: 1
Radio Room: 1
Helicopter Assembly Room: 1
Hospital / No of Beds 1/1
Accommodations:  
Number of single rooms:
3
Number of double rooms:
4
Number of four men¡¯s rooms:
10
Number of six men¡¯s rooms: 8
Toilets: 7
Showers: 7
Galley: 2
Recreation Room: 1
Gym: NIL
Changing Room: 1
Deck Crane
Crane: Three Amclyde unit 10000 HD
Location: Port/Stb fwd/Stb Aft.
Boom Length: 100ft/100ft/110ft
Block capacities and hoisting speeds:  
Load/Radius/Speed (min. radius): 40T/25¡¯ / (ft/sec)
Load/Radius/Speed (max.radius): 10T/90¡¯/ (ft/sec)
Jacking Systems and Rack chock system
Make/type: National 400 system
No. of jacks or pinions: 48 units
Maximum normal jacking capacity: 400 kips/units
Maximum preload jacking capacity: 800 kips/units
Jacking speed: 1.1 ft/min
Rack chocks available: Yes
 
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