The work is expected to take three to four days, the company said.
The Stanley-1 well was the first to be drilled under Mosman’s alliance with Baja Oil & Gas and it highlighted it had been flowing gas and some oil from the Wilcox formation since initial completion but output had been constrained by limited gas infrastructure.
By recompleting the Stanley well, the plan is to produce oil from the separate Sparta zone, meanwhile, the Wilcox zone will be cemented off to potentially be re-entered at a later time.
"The decision was made to re-complete the well to focus on oil production until the gas infrastructure is improved,” said John Barr, Mosman chief executive.
“It is good to have work commence on site after the winter-rain season and the board of Mosman very much look forward to the detailed results and to updating shareholders as soon as possible."