Santos Ltd suspended the Derwin 1 exploration well as a gas discovery on 3 August 2020. The well, located in PPL 152, located in the Cooper-Eromanga Basin, was spudded on 23 July 2020 and was drilled to a total depth of 3,154 m by the Ensign "974" land rig.   The vertical well was likely targeting the Permian Patchawarra Formation and/or the Tirrawarra Sandstone as a primary objective on the basis of nearby successes. The well was the first to be drilled in PPL 152.  The well is located on trend with the gas bearing, northeast-southwest trending, Yarrow and Napowie structures. The Flax oil and gas field is the most proximal success and is located 9.2 km east northeast of Derwin 1. The Flax field was discovered in 2004 and produced from the Patchawarra Formation and the Tirrawarra Sandstone before being shut in and the facilities placed on care and maintenance in 2015. The Yarrow 1 well, also drilled in 2004, flowed 1.6 MMcf/d of gas and 15-40 b/d of condensate from the same formations. Appraisal well Yarrow 2 intersected tight reservoirs in both the Patchawarra Formation and the Tirrawarra Sandstone, and in doing so reduced the commerciality of the discovery.  PPL 152, which covers an area of 4 sq km, was awarded on 11 August 1999. Participants in the license are, through various subsidiaries, Santos Ltd (72.321% plus operatorship) and Beach Energy (27.679%).
(Eromanga B.) Derwin-1 nfw, located in PPL 152, operated by SANTOS (72%) partner BEACH (28%), suspended as a gas discovery. Target Patchawarra and/or Tirrawarra fm.