Detailed Description:

The fields extend from onshore to offshore, the onshore part lying in salt flats, a portion of which is likely to be flooded during the monsoon season. Offshore, the environment is that of extremely shallow inter-tidal mud flats, where at low tide, there are some water channels and most of the area is exposed. At high tide, the water level is just enough to get a jack-up rig in. There is also an area of "no-man's land", where it may not be possible to use either a jack-up or a land rig. The reservoir areas are each approximately 30 km2 (10 km x 3 km).

objectives:

The objectives of the studies within this scope of work are to:

• using data supplied by client and knowledge gained during the course of the Feasibility Study, carry out a review of a number of feasible development options for Full Field Development and selection of development concept based on preliminary cost and schedule estimates;
• demonstrate that project is economic at the P90 level;
• further define the preferred concept with the generation of certain design deliverables which will allow a +/- 30% cost estimate to be developed;
• develop an initial programme for the preferred concept.

environmental data:

Currents:
Probable maximum current (tidal + wind driven at surface): 5.1 m/s (9.9 knots)
Movement of vessels may be restricted to periods of slack water (possibly as little as 1 hour, twice per day).

Wind Conditions:
One minute mean wind: 42 m/s
3 second gust wind: 50 m/s

Wave Heights:
Extreme height: 5.3 - 7.8 m
Crest to crest period: 7.3 - 8.3 s
Length: 64 - 95 m
Significant height: 3.0 - 4.0 m
Peak period: 6.3 - 6.8 m

Water Depths:
Water depth at datum: -0.2 - +8.6 m (wrt MSL)
Crest elevation: 3.1 - 5.5 m
Tidal rise (mean high water spring): 8.9 - 9.9 m
Storm surge: 4.5 m
Safety margin: 1.7 - 2.0 m
Minimum air gap above datum: 1.2 - 1.5 m

soil conditions:

The soil is assumed to be medium dense fine silty with an internal angle of friction of 30o and a submerged unit weight of 9 kN/m3. Footing penetrations are envisaged for a drilling unit with three 9 foot diameter cylindrical legs not fitted with spud cans to be 5 to 10 m. Scour protection of some nature is likely to be necessary.

fluid data:

Reservoir pressure: 1874 psia at datum (1200 m)
Well depth: 1270 m
GOR: 43.21 scf/stb
oAPI: 45.57
Pour point: 30oC
Wax content: 6.78%