3,000M Deepwater Semi-Submersible Drill Rig -- Designed by Marine Design & Research Insititute of China

The Deepwater Semi-submersible Drilling Unit "Hai Yang Shi You 981" is built for China National Offshore Oil Corporation (CNOOC). It has twin shaped lower hulls supporting four (4) corner columns, transverse braces, and a watertight selevated deck.

The Unit is capable of drilling as dynamically positioned (DPS-3) drilling unit in water depths up to 3,050m (10,000 ft), drilling depths up to 10,000m (32,800 ft) for operations in moderate environments, and conventionally moored in water depths up to 1,500m (4,921 ft).

MAIN PARTICULARS
- Width of deck box:      74.42 m      (244 ft)
- Length of deck box:     77.47 m      (254 ft)
- Width of pontoons:      20.12 m       (66 ft)
- Length of pontoons:    114.07 m    (374.2 ft)
- Height of pontoons:      8.54 m       (28 ft)
- Four columns:     17.4 x 17.4 m (57.1 x 57.1 ft)
- Height to main deck:     38.6 m    (126.6 ft)
- Height of deck box:       8.6 m       (28 ft)
- Transit draught:          8.2 m       (27 ft)
- Transit displacement:  37,456 mt  (41,298 st)
- Transit variable load:  5,000 mt   (5,511 st)
- Operation draught:         19 m     (62.3 ft)
- Operation displacement: 51,624 mt (56,906 st)
- Operation variavle load: 9,000 mt  (9,920 st)
- Survival draught:          16 m    (52.49 ft)
- Air gap survival:          14 m    (45.93 ft)

MAIN MARINE SYSTEM / EQUIPMENT
- Power generation:    8 x 5,530 kW (8 x 7,416 hp)
- Thrusters:           8 x 4,300 kW (8 x 6,169 hp)
- DP Class:            DP3
- Mooring system:      12 point mooring
- Main deck cranes:    2 x 100 mt (2 x 110 st)

MAIN DRILLING SYSTEM / EQUIPMENT
- Derrick for up to 135 feet stands: 907 mt (1,000 st)
- Top drive:     907 mt (1,000 st)
- Drawworks:     907 mt (1,000 st)
- Riser tensioners, N-line type: 1,630 mt (1,800 st)
- Mud pumps:     4 x 1,700 kW (4 x 2,200 hp)
- BOP Stace:     15,000 psi 6 rams

TANK / STORAGE CAPACITIES
- Fuel oil:       4,603 m³ (28,950 bbls)
- Drill water:    3,123 m³ (19,641 bbls)
- Potable water:  1,391 m³ (8,748 bbls)
- Reserve Mud:    1,700 m³ (10,692 bbls)
- Mud pits:       1,039 m³ (6,535 bbls)
- Brine:            723 m³ (4,547 bbls)
- Base oil:         767 m³ (4,824 bbls)
- Bulk mud:         553 m³ (3,478 bbls)
- Bulk cement:      350 m³ (2,201 bbls)
- Sack storage: 6,000 sacks