Over 200 workovers have been completed In Bass Strait since 1987. These workovers have been a major factor in arresting the decline of Bass Strait oil production. The work has been performed with a variety of equipment, including wireline, coiled tubing, hydraulic concentric and jack-up rigs. Individual costs have ranged from less than A$ 1k up to A$ 4M.
Bass Strait has 300 completions with an average age of 12 years, giving rise to numerous workover opportunities. Due to the isolation of Bass Strait, conventional workovers have proved expensive with long lead times. Hence effort has been placed on innovative wireline or concentric workover techniques, that have restored wells to production without resorting to conventional workovers.