Senex Energy drilling Paning-2 unconventional gas well in Cooper basin
BRISBANE -- Senex has commenced its 12-well unconventional gas exploration program with the spudding of the Paning-2 well in northern Cooper Basin permit PEL 90. Weatherford Rig 826 has currently reached a depth of 751 m and is running 13-3/8-in. casing. The targeted total depth of the well is 3,175 m.
Paning-2 is located 1.2 km southwest of Paning-1, which was drilled in 1980 by Delhi Petroleum as a conventional gas exploration well. The Paning-2 well is the first unconventional gas exploration well to be drilled in the region and is designed to provide valuable information about the potential for gas production from the tight sands and deep coal seams of this new region. Paning-2 will test the domal structure up dip of Paning 1 at the top of the Patchawarra formation the structure covers an area of more than 36 sq km . The primary targets are the tight sandstones in the Toolachee, Epsilon and Patchawarra Formations, and thick coal seams in the Toolachee Formation. The Tirrawarra Sandstone, which underlies the Patchawarra Formation also has potential as a tight sand play.
The Paning-2 well is the first exploration well to test the potential of the Permian tight sand sequence that exists within the entire Patchawarra Trough. Paning-2 will test massive Permian coals known to exist throughout the Patchawarra Trough where Senex holds an extensive acreage position.
The coals in Paning-1 are up to 30 m thick with a total coal thickness in the well of 57 m. Similar thicknesses are expected in Paning-2. Data from the desorption of Permian coals cored in previous Senex wells indicates gas contents. The productivity of the Permian coals was proven by Santos at the Moomba-77 well. The unconventional gas target located in deep coal seams within this 9,000-acre structure is estimated to contain potential gas in place of 2.1 Tcf.