The climate activists attached themselves to the structure with climbing equipment and set up temporary tents, according to Greenpeace. The group said four protesters had travelled to the platform and intended to stay as long as possible.
Yesterday, special police forces landed a helicopter on the platform and removed the protesters, taking them into custody. Greenpeace confirmed that two activists were arrested.
The protest was directed at Woodside's plans to drill for oil and gas in the Scott Reef area, a location environmental groups have long opposed for development.
The incident is the latest in a series of direct actions by environmental activists targeting fossil fuel infrastructure in Australia.