interest in this well and in EP 436. The well is located some 80 kms to the east of Broome. The well location is some eight kilometres from the Great Northern Highway along the all weather Yulleroo access road. The well has a programmed total depth of 3,800 metres and is expected to take some 52 days to drill and suspend.
The Yulleroo wet gas accumulation was identified by the Yulleroo 1 well that was drilled in 1967 and tested gas at low rates from a very substantial gas column in a thick sequence of shales and sands in the Laurel Formation. The Yulleroo 2 well was drilled in 2008 by ARC Energy to appraise the Yulleroo 1 discovery, and recorded strong gas shows at the same stratigraphic level as Yulleroo 1. Buru conducted a successful reservoir stimulation operation at Yulleroo 2 in 2010, demonstrating that the reservoir was capable of flowing gas of good quality with significant hydrocarbon liquid content.
The Yulleroo 3 well was drilled by Buru and MC in 2012 and had strong gas shows over an interval of over 1,500 metres. This intersection added over a thousand metres of gas charged section above the previously interpreted top of the gas sands in Yulleroo 1, together with a number of additional sand packages. Significantly, a thin sand at around 3,200 metres is interpreted to have conventional reservoir properties. This sand has the potential to materially improve the flow rates from this well without requiring any reservoir stimulation. If this sand is developed over a larger area with similar reservoir properties it is expected to add significantly to the commercial potential of the field.
In a broader context, the gas wetness ratios and inferred pressure data in the Yulleroo 3 well are indicative of the Yulleroo accumulation being part of a basin centred gas system similar to that seen in the Valhalla area. The Yulleroo 4 well is therefore being deliberately drilled at the limits of structural closure of the Yulleroo structure, as interpreted from the 3D seismic data acquired over the field in 2011. The well will test the extent of the gas column in this part of the accumulation and is expected to confirm Buru’s interpretation that the Yulleroo field is part of a geographically
extensive basin centred gas accumulation extending beyond the mapped structural closure. If this is proved to be the case, the Yulleroo area has the potential to hold multi TCF’s of gas. The well will also help define the extent and potential recoverable volumes of gas from the conventional 3,200m sand identified in Yulleroo 3.