The Pioneering Spirit installed the 22,000-tonne drilling platform topsides on the Johan Sverdrup field over the weekend.
It means two of the four platforms for the giant field are now in place.
After initial preparations, the installation job took only three hours.
Trond Bokn, senior vice president for Johan Sverdrup at Equinor, said: “This is an important milestone in the Johan Sverdrup installation campaign.
“Two of the four Johan Sverdrup platforms are now in place.
“The power cables to the field were rolled out last week, and so far, the installation of Norway’s biggest oil pipeline has gone very well, so this is definitely moving in the right direction.”