公开(公告)号：US20180155987A1

公开(公告)日：2018-06-07

申请号：US15578065

申请日：2016-05-30

Applicant: MAERSK DRILLING A/S

Inventor： Jens Jørgen MADSEN

IPC: E21B7/12 ,  E21B33/064 ,  E21B15/02 ,  B63B35/44 ,  B63B21/50

Abstract: A process for drilling a well into the seafloor at an offshore drilling location, in particular in arctic regions, the process comprising: drilling a top hole part of the well during a winter season where the water at the drilling location is at least partly covered by ice; and initiating drilling a lower part of the well extending into a hydrocarbon-bearing formation during a subsequent off-winter season where the water is less ice infested than during the winter season.