EX-8.1 2 exhibit812017.htm EXHIBIT 8.1 Exhibit


Exhibit 8.1
SIGNIFICANT SUBSIDIARIES

The table below lists the Company's significant subsidiaries as of December 31, 2017:
Name of company
Country of Incorporation
Principal activities
Percent owned




Drilling unit owning companies







Asia Offshore Rig 1 Ltd
Bermuda
Owner of AOD 1
66.23%
Asia Offshore Rig 2 Ltd
Bermuda
Owner of AOD 2
66.23%
Asia Offshore Rig 3 Ltd
Bermuda
Owner of AOD 3
66.23%
Sevan Brasil Ltd
Bermuda
Owner of Sevan Brasil
50.11%
Sevan Drilling Rig VI Pte Ltd
Singapore
Owner of Sevan Developer no. 4
50.11%
Sevan Driller Ltd
Bermuda
Owner of Sevan Driller
50.11%
Sevan Louisiana Hungary KFT
Hungary
Owner of Sevan Louisiana
50.11%
North Atlantic Alpha Ltd
Bermuda
Owner of West Alpha
70.36%
Seadrill Aquila Ltd
Bermuda
Owner of West Aquila
100.00%
Seadrill Ariel Ltd.
Liberia
Owner of West Ariel
100.00%
Seadrill Callisto Ltd
Bermuda
Owner of West Calisto
100.00%
Seadrill Carina Ltd
Bermuda
Owner of West Carina
100.00%
Seadrill Castor Ltd
Bermuda
Owner of West Castor
100.00%
Seadrill Cressida Ltd
Bermuda
Owner of West Cressida
100.00%
Seadrill Defender (S) Pte Ltd
Singapore
Owner of West Defender
100.00%
Seadrill Dione Ltd
Bermuda
Owner of West Dione
100.00%
Seadrill Dorado Ltd
Bermuda
Owner of West Dorado
100.00%
Seadrill Draco Ltd
Bermuda
Owner of West Draco
100.00%
Seadrill Eclipse Ltd
Bermuda
Owner of West Eclipse
100.00%
North Atlantic Elara Ltd
Bermuda
Owner of West Elara
70.36%
Seadrill Eminence Ltd
Bermuda
Owner of West Eminence
100.00%
North Atlantic Epsilon Ltd
Bermuda
Owner of West Epsilon
70.36%
Seadrill Freedom Ltd
Bermuda
Owner of West Freedom
100.00%
Seadrill Gemini Ltd
Bermuda
Owner of West Gemini
100.00%
Seadrill Hyperion Ltd
Bermuda
Owner of West Hyperion
100.00%
Seadrill Jupiter Ltd.
Bermuda
Owner of West Jupiter
100.00%
Seadrill Indonesia Ltd
Bermuda
Owner of West Leda
100.00%
Seadrill Libra Ltd
Bermuda
Owner of West Libra
100.00%
Seadrill Mimas Ltd
Bermuda
Owner of West Mimas
100.00%
Seadrill Mira Ltd
Bermuda
Owner of West Mira
100.00%
North Atlantic Navigator Ltd
Bermuda
Owner of West Navigator
70.36%
Seadrill Neptune Hungary KFT
Bermuda
Owner of West Neptune
100.00%
Seadrill Orion Ltd
Bermuda
Owner of West Orion
100.00%
Seadrill Pegasus Pte Ltd
Singapore
Owner of West Pegasus
100.00%
North Atlantic Pheonix Ltd
Bermuda
Owner of West Phoenix
70.36%
Seadrill Prospero Ltd
Bermuda
Owner of West Prospero
100.00%
Seadrill Proteus Ltd
Bermuda
Owner of West Proteus
100.00%
Seadrill Rhea Ltd
Bermuda
Owner of West Rhea
100.00%
North Atlantic Rigel Ltd
Bermuda
Owner of West Rigel
70.36%
Seadrill Saturn Ltd
Bermuda
Owner of West Saturn
100.00%
Seadrill Telesto Ltd
Bermuda
Owner of West Telesto
100.00%
Seadrill Tellus Ltd
Bermuda
Owner of West Tellus
100.00%
Seadrill Tethys Ltd
Bermuda
Owner of West Tethys
100.00%
Seadrill Titan Ltd
Bermuda
Owner of West Titan
100.00%
Seadrill Tucana Ltd
Bermuda
Owner of West Tucana
100.00%




Seadrill Umbriel Ltd
Bermuda
Owner of West Umbriel
100.00%
North Atlantic Venture Ltd
Bermuda
Owner of West Venture
70.36%
Scorpion Vigilant Ltd
Bermuda
Owner of West Vigilant
100.00%




Drilling units under sale leaseback







SFL Deepwater Ltd*
Bermuda
Owner of West Taurus
—%
SFL Hercules Ltd*
Bermuda
Owner of West Hercules
—%
SFL Linus Ltd*
Bermuda
Owner of West Linus
—%




Contracting and management companies







North Atlantic Crew AS
Norway
Crewing Company
70.36%
North Atlantic Crewing Ltd (Bermuda)
Bermuda
Crewing Company
70.36%
North Atlantic Drilling UK Ltd
United Kingdom
Drilling services contractor
70.36%
North Atlantic Management AS
Norway
Management company
70.36%
North Atlantic Norway Ltd
Bermuda
Drilling services contractor
70.36%
North Atlantic Support Services Ltd
United Kingdom
Management company
70.36%
Sea Dragon de Mexico S. de R.L. de C.V.
Mexico
Management company
100.00%
Seadrill Americas Inc.
USA
Drilling services contractor and technical services company
100.00%
Seadrill Deepwater Contracting Ltd
Bermuda
Contracting company
100.00%
Seadrill Deepwater Crewing Ltd
Bermuda
Crewing company
100.00%
Seadrill Deepwater Units Pte Ltd.
Singapore
Management company
100.00%
Seadrill Insurance Ltd.
Bermuda
Insurance company
100.00%
Seadrill Management (S) Pte Ltd
Singapore
Management company
100.00%
Seadrill Management AME Ltd.
Bermuda
Management company
100.00%
Seadrill Management AS
Norway
Management company
100.00%
Seadrill Management Limited
United Kingdom
Management company
100.00%
Seadrill Management Services Ltd
British Virgin Islands
Management company
100.00%
Seadrill Offshore AS
Norway
Drilling services contractor
100.00%
Seadrill Offshore Singapore Pte Ltd
Singapore
Management company
100.00%
Seadrill Servicos de Petroleo Ltda.
Brazil
Drilling services contractor
100.00%




Holding Companies







North Atlantic Drilling Ltd
Bermuda
Holding Company
70.36%
Seadrill Common Holdings Ltd
Bermuda
Holding Company
100.00%
Seadrill Deepwater Holdings Ltd
Bermuda
Holding Company
100.00%
Seadrill Jack Up Holding Ltd
Bermuda
Holding Company
100.00%
Seadrill Member LLC
Marshall Islands
Holding Company
100.00%
Seadrill UK Ltd
United Kingdom
Holding Company
100.00%
SeaMex Ltd
Bermuda
Holding Company
100.00%
Sevan Drilling ASA
Norway
Holding Company
50.11%
Sevan Drilling Ltd
Bermuda
Holding Company
50.11%

* Fully consolidated Variable interest entities