Well Summary:
The Sunset West-1 exploration well was drilled by the Semi-submersible rig Ocean Epoch in Contract Area ZOCA 95-19 in the Timor Sea, some 440 km northwest of Darwin, Northern Australia.
Sunset West-1 was the first of two appraisal/exploration wells to be drilled in order to reduce key uncertainties affecting the commercialization of the Sunrise Gas Field, discovered by Sunrise-1 in 1975.
Water depth at the Sunset West-1 location was 311 metres (Lowest Astronomical Tide-LAT) and the Rotary table elevation was 22 metres. Depth measurements in this report are with reference to the rotary table and indicated by mRT.
The Ocean Epoch drilling rig was on location on 13 April 1998 and Sunset West-1 was spudded on 14 April 1998.
Sunset West-1 reached a total depth (TD) of 2505 mRT. Hydrocarbons were encountered in the objective horizon sandstones and two drill steam tests carried out, producing gas at maximum flow rates of 11 MMscf/d through a 64/64” choke (DST-1A) and 19.3 MMscf/d through a 84/64” choke (DST-2). Then the well was plugged and abandoned, and the Ocean Epoch left the location on 22 May 1998.
Sunset West-1 Well Data
Well: Sunset West-1
Operator: Woodside Offshore Petroleum Pty. Ltd.
Participants/JV’s: Woodside Offshore Petroleum Pty. Ltd.
BHP Petroleum (Asia/Pacific) Inc.
Shell Development Australia (PSC 19) Pty. Ltd
Well Location: Sunset West-1
Latitude: 009° 38’ 806”S
Longitude: 127° 53’ 57.840”E
Easting: 379 239.6 m
Northing: 8 934 720.2 m
Seismic Reference: Line Z97-26
Shotpoint 1637
ZOCA 95-19, 95-20 2D Dataset.
Drilling Rig: Ocean Epoch (semi-submersible)
Water Depth: 311 meters (LAT)
Rotary Table: 22 meters.
Date Rig Contract: 11 April 1998
Rig on Location: 13 April 1998
Spud Date: 14 April 1998
Total Depth: 2505 meters
Total Time on Well: 40.85 days
Well Status: Plugged and Abandoned.
FORMATION SAMPLING
SAMPLE RECORD
Type | No. | Interval (mRT) | Remarks |
| Ditch Cuttings |  | 1686-2505 | 5 metres intervals |
| Sidewall cores | 1 2 | 383-1570 2492-1793.7 | Attempted 50, Recovered 38 Attempted 50, Recovered 37 |
| Rotary Cores | 1 2 | 2441/2426? 2263-2269 | Attempted 4, Rec. 1. Exact depth unknown Attempted 7, Rec.5 |
| Cores | 1 2 3 | 2187.0-2241.8 2241.8-2272.3 2272.3-2309.2 | Recovered 54.8 m (100%) Recovered 10.1 m (33%) Recovered 36.92 m (100%) |
FORMATION EVALUATION
MWD
Run | Interval (mRT) | Remarks |
1 | 377-1686 | DIR-FE |
2 | 1886-2187 | DIR-FE |
3 | 2187-2502 | DIR-FE |
Wireline Log