公开(公告)号：US10738543B2

公开(公告)日：2020-08-11

申请号：US15772056

申请日：2016-10-28

Applicant: MAERSK DRILLING A/S

Inventor： William James McBeath

IPC: E21B19/00 ,  E21B19/02

Abstract: Disclosed herein are embodiments of an offshore drilling rig comprising: a drill floor (107) defining a well center (123); a hoisting system configured to advance a tubular string (128) downwards through the well center (123) and to the seafloor (124) and to apply a lifting force to a tubular string (128) extending through the well center (123) and to the seafloor (124), the lifting force being large enough to support at least a major part of an apparent weight of the tubular string (128); and an anti-recoil system (218) configured to cause, in case of a sudden reduction of a load suspended from the drilling rig, the hoisting system to raise the tubular string (128) while preventing damage to the hoisting system.

公开(公告)号：US11377913B2

公开(公告)日：2022-07-05

申请号：US16989181

申请日：2020-08-10

Applicant: MAERSK DRILLING A/S

Inventor： William James McBeath

IPC: E21B19/00 ,  E21B19/02

Abstract: Disclosed herein are embodiments of an offshore drilling rig comprising: a drill floor (107) defining a well center (123); a hoisting system configured to advance a tubular string (128) downwards through the well center (123) and to the seafloor (124) and to apply a lifting force to a tubular string (128) extending through the well center (123) and to the seafloor (124), the lifting force being large enough to support at least a major part of an apparent weight of the tubular string (128); and an anti-recoil system (218) configured to cause, in case of a sudden reduction of a load suspended from the drilling rig, the hoisting system to raise the tubular string (128) while preventing damage to the hoisting system.