The Cossack oilfield will be Woodside's first "oil" development The Cossack #1 discovery well was drilled in January 1990, and encountered a gross oil column of 54 m. Recoverable reserves are estimated to be 60 million bbl "expectation" and 30 million bbl "proven". Screening studies of a number of development alternatives were quickly completed In April 1990. These studies were followed by more detailed feasibility studies, concluded in September 1990, which confirmed that the field was ideal for a standalone development A project team was formed and project definition studies completed in January 1991, ultimately leading to full budget approval in July 1991. First oil is scheduled for June 1993, three and a half years from the date of the discovery well. It is planned to recover the oil by means of up to six subsea wells, drilled in a cluster and tied back to a Floating Production, Storage and Offloading (FPSO) vessel. This will be a converted 155,000 dwt tanker which will be moored via a disconnectable system, thus being able to steam out of the path of tropical cyclones which regularly pass through the area.