Combined reserve potential for the Exeter and Mutineer fields is 50-130 million barrels. The Exeter-2 well intersected top reservoir approximately 40 meters deeper than at Exeter-1 and encountered nine meters of net oil pay over the interval 3,151-3,162 meters in good quality Angel Formation sandstones. The Wanaea, Cossack and Lambert oil fields, located 15 to 35 km south east of Exeter, are highly productive from the same age Angel Formation reservoirs.
The total oil column height established by Exeter-1 and Exeter–2 is 51 meters. Sampling from the Exeter-1 well indicates light oil (API 45 degrees) with a low gas-oil ratio.
Commenting, Santos Managing Director Mr. John Ellice-Flint said, "The Exeter 2 result is certainly very encouraging. This success reflects the strong commitment by Santos and its joint venture partners in WA-191-P to fast-track the appraisal of the initial Exeter discovery and realize the potential of the permit. The recent drilling results confirm that Santos’ explorationists have developed a solid understanding of the hydrocarbon trapping mechanism in this area, in particular the time-to-depth function".
The well has been logged, defining an oil-water contact that is deeper than the oil-water contact encountered in the Pitcairn-1 oil discovery, 7 km north east on the Mutineer complex. The Exeter field is located in 147 meters of water, some 150 km north of Dampier, off the West Australian Coast. Exeter-2 follows the Exeter-1 well, which discovered a net oil column of 18 meters over the 3,110-3,133 meter interval in the Angel Formation, and a number of successful wells drilled by Santos and its joint venture partners on the Mutineer complex. Further appraisal of both Exeter and Mutineer is required to optimize the development plan for this area but a combined development of both fields is now a likely scenario. Two further wells, one each on Mutineer and Exeter are currently being considered for drilling as soon as possible in 2002 to better define the volumes. Exeter-2 is the fifth well in the exploration and appraisal program aimed at commercializing the Mutineer-Exeter area and fast-tracking the development. The forward program for Exeter-2 is to plug and abandon the well prior to releasing the rig.
Mr. Ellice-Flint also commented: "Drilling performance in the Exeter-Mutineer campaign has been particularly pleasing. Since mid 2001 Santos has drilled 11 offshore wells. To date the cost of drilling has been reduced to A$2,790 per meter from A$5,035 per meter in Santos' last operated offshore drilling activity in 1998. At the same time drilling efficiency has improved from 78 meters per day to 250 meters per day".
Interests in the Exeter-2 well are: Santos as operator with 44.53%; KUFPEC Australia Pty. Ltd. with 44.54%; Woodside with the remaining 10.93%.
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