Extended Operational and Trade Vocabulary

Offshore Drilling Rigs, FPSOs, and Offshore Vessels glossary

Vocabulary of offshore drilling and support: MODU classification rules, anchor-handling tug supply and anchor-handling tugs, semisubmersible hull generations such as the Aker H-3 and H-6e with DP3 station-keeping, FPSOs, and the rig designs and support-vessel terminology serving the offshore oil and gas industry.

333 defined terms.

Showing 250 on this page (page 1 of 2).

A

ABS MODU Rules: American Bureau of Shipping classification rules for Mobile Offshore Drilling Units governing structure, stability, and machinery.
ADC: Arabian Drilling Company, a Saudi jackup drilling contractor partly owned by TAQA and Industrialization & Energy Services.
ADES: Saudi Arabia-based ADES Holding, a major jackup and onshore drilling contractor with regional Middle East focus.
AHT: Anchor Handling Tug, deploys ground tackle and beach gear for refloating operations.
AHTS: Anchor Handling Tug Supply, multipurpose vessel for salvage tow, anchor work, and supply.
Aker Barents: Aker H-6e sister rig to Aker Spitsbergen used in Norwegian and Barents Sea drilling campaigns.
Aker H-3: Norwegian-designed second-generation semisubmersible drilling rig hull from Aker Group widely built in the 1970s.
Aker H-4.2: Twin-pontoon column-stabilized semisubmersible design used for harsh environment drilling in the North Sea.
Aker H-6e: Sixth-generation harsh-environment semisubmersible design with dual derrick and DP3 station keeping.
Aker Spitsbergen: Aker H-6e harsh-environment semisubmersible delivered in 2009 and operated by Transocean.
Anna Nery FPSO: Yinson FPSO operating on the Marlim revitalization for Petrobras offshore Brazil.
Aoka Mizu FPSO: Bluewater-operated FPSO on the Lancaster field west of Shetland.
API RP 2A: American Petroleum Institute recommended practice for fixed offshore platform design.
API RP 2SK: API recommended practice for design and analysis of stationkeeping for floating structures.
API RP 2T: API recommended practice for planning, designing, and constructing tension leg platforms.
Armada Kraken FPSO: Bumi Armada FPSO operating on the Kraken field in the UK North Sea for EnQuest.
Armada Olombendo FPSO: Bumi Armada FPSO operating on the East Hub Development offshore Angola.
Articulated Loading Platform: Tower-style single-point mooring with a buoyant column hinged to a seabed base for tanker offloading.
Atwood Oceanics: Former US offshore drilling contractor acquired by Ensco in 2017 prior to Ensco's later rebranding as Valaris.

B

Bassoe SSDR: Bassoe Technology semisubmersible drilling rig designs including the Bassoe D-Class harsh-environment hull.
Bingo 9000: Friede Goldman semisubmersible design with a square hull and four columns used by several deepwater rigs.
Bluewater: Netherlands-based FPSO contractor operating units such as Aoka Mizu, Glas Dowr, and Bleo Holm.
Borr Drilling: Bermuda-headquartered modern jackup specialist founded in 2016 with a fleet of premium benign-environment jackups.
Bow Loading System: Tanker bow connection for offtake from FPSO/FSO.
Brasdrill: Constellation Oil Services subsidiary brand historically used by the Schahin-rooted Brazilian drilling group.
Bully I Drillship: Frontier Drilling-designed compact deepwater drillship later operated by Noble.
Bully II Drillship: Sister vessel to Bully I, a compact deepwater drillship of innovative hull form.
Bumi Armada: Malaysia-based offshore operator running FPSOs and offshore support vessels.
Buoyancy Can: Subsea buoyancy module providing upward lift to risers or tendon systems on floating production structures.
BW Catcher FPSO: BW Offshore FPSO operating on the Catcher field in the UK North Sea for Premier Oil.
BW Offshore: Oslo-listed FPSO owner and operator with a fleet of converted and purpose-built production units.
BW Pioneer FPSO: BW Offshore FPSO operating on the Cascade and Chinook fields in the US Gulf of Mexico.

C

CALM Buoy: Catenary anchor leg mooring; surface buoy held by catenary chain legs for tanker offtake.
Cantilever Jackup: Jackup rig whose drill floor extends on a skidding cantilever beam to drill over fixed platform wells.
Catenary Mooring: Mooring system relying on chain or wire weight forming a catenary shape to restrain a floating unit.
Centerline Slot Jackup: Slot-type jackup with the drilling slot located within the hull rather than cantilevered overboard.
Christmas Tree: Stack of valves on a wellhead controlling production flow; subsea or surface (XT).
Cidade de Itaguai FPSO: Modec FPSO operating on the Iracema Norte field for Petrobras.
Cidade de Mangaratiba FPSO: Modec FPSO operating on the Iracema Sul field for Petrobras.
Cidade de Marica FPSO: SBM-built FPSO operating on the Lula Alto field for Petrobras.
Cidade de Saquarema FPSO: SBM-built FPSO operating on the Lula Central field for Petrobras.
CIMC Beacon Atlantic: CIMC Raffles-built deepwater semisubmersible.
CIMC Raffles: Chinese shipbuilder at Yantai producing semisubmersibles, jackups, and specialized offshore units.
CJ-46: Cameron LeTourneau-derived 116E-class jackup design now marketed by various builders including MSC.
CJ-50: MSC jackup design rated for 350 to 400 foot water depth used by several Asian and Middle East operators.
CJ-70: MSC ultra-harsh-environment jackup design rated to 150 meter water depth used by Maersk Innovator and Inspirer.
Class Notation DPS-3: DNV class notation for dynamic positioning system with full redundancy across two engine rooms.
CLV: Cable Lay Vessel used to install submarine power and telecommunications cables, often with carousel and tensioner systems.
Conductor Pipe: Large diameter pipe driven or drilled at the start of a well to stabilize the upper formation.
Constellation Oil Services: Brazilian deepwater drilling contractor formed from the Queiroz Galvao Oleo e Gas restructuring.
Coral Sul FLNG: Eni-operated floating LNG unit on the Coral South field offshore Mozambique built by Samsung Heavy Industries.
COSCO Zhoushan: Chinese shipyard that built numerous semisubmersibles, drillships, and accommodation units.
COSL: China Oilfield Services Limited, integrated offshore services arm of CNOOC operating jackups and semisubmersibles.
CSV: Construction support vessel.
CTV: Crew transfer vessel; small catamaran transferring wind technicians.

D

Dalian Shipbuilding: Chinese shipbuilder that constructed semisubmersibles such as the COSL Pioneer series and various jackups.
Deepwater Horizon: Transocean semi-submersible lost 2010 at Macondo; 11 fatalities; largest US marine oil spill.
Deepwater Nautilus: Transocean fifth-generation semisubmersible based on the RBS-6 design rated for 8,000 foot water depth.
Derrick Equipment Set: Surface drilling package including drawworks, top drive, and rotary table mounted in a derrick.
Diamond Offshore: US drilling contractor that operated the Ocean-series semisubmersibles before its 2024 acquisition by Noble.
Disconnectable Turret: Internal turret mooring designed to be released so the floater can sail off-station during cyclones.
Dixilyn-Field: Historic drilling contractor whose semisubmersibles were absorbed into later major contractor fleets.
DNV-OS-E101: DNV offshore standard covering design of stationkeeping anchoring systems.
DNV-OS-E301: DNV offshore standard for position mooring of floating offshore units.
Dolphin Drilling: Norwegian semisubmersible contractor with units including the Borgland Dolphin.
DP1: Dynamic positioning class with no redundancy; loss of one element can cause position loss.
DP2: Dynamic positioning class tolerant to any single fault excluding loss of compartment.
DP3: DP class tolerant to any single fault including fire or flood in one compartment.
Drag Embedment Anchor: Traditional fluke anchor embedding by horizontal pull.
Drillship: Mobile offshore drilling unit shaped as a ship.
Drillship 6th Generation: Drillship class characterized by dual derricks, DP3, and ratings up to 10,000 to 12,000 foot water depth.
Drillship 7th Generation: Latest drillship class with enhanced hookload, dual BOPs, and 20,000 psi BOP capability options.
DSV: Dive Support Vessel, dynamically positioned platform for saturation diving operations.
Dual Activity Drillship: Drillship with two drilling stations allowing parallel operations to reduce well construction time.

E

East Hub FPSO: Eni FPSO operating on the East Hub project offshore Angola in Block 15/06.
Egina FPSO: Total-operated FPSO on the Egina field offshore Nigeria with 2.3 million barrel storage capacity.
Energean Power FPSO: Yinson-supplied FPSO operating on the Karish field offshore Israel for Energean.
ENSCO 8500 Series: Ensco-designed harsh-environment semisubmersible series for ultra-deepwater operations.
Ensco DS-12: Sixth-generation drillship in the Valaris fleet inherited from Ensco.
Enterprise-class Drillship: Transocean Discoverer Enterprise-class dual derrick deepwater drillship series.
ERRV: Emergency response and rescue vessel; standby duties in UK sector.
Espirito Santo FPSO: SBM-built FPSO operating on the BC-10 Parque das Conchas field offshore Brazil for Shell.
Etesco: Brazilian drilling contractor historically operating onshore and offshore drilling rigs.
External Turret: Turret mooring mounted on an outboard structure forward of the FPSO bow.

F

F&G L-1500: Friede & Goldman large jackup design supporting deeper water and heavier loads than the L-780.
F&G L-780: Friede & Goldman jackup design supporting 300 foot water depth, common in the US Gulf and West Africa.
FG JU-2000E: Friede Goldman premium 400 foot jackup design widely built by Lamprell and others.
Flex Riser: Unbonded flexible pipe used as a dynamic production riser between subsea wells and floating units.
FLNG: Floating liquefied natural gas facility; liquefaction and storage at sea.
FloaTEC Spar: FloaTEC spar designs delivered for several Gulf of Mexico developments.
FPSO: Floating production, storage and offloading unit; turret or spread moored.
FPSO Berge Helene: Teekay Offshore FPSO formerly operating on the Chinguetti field offshore Mauritania.
FPSO Cidade de Anchieta: Modec FPSO operating on the Baleia Azul cluster for Petrobras.
FPSO Cidade de Niteroi: Modec FPSO operating on the Marlim Leste field for Petrobras.
Friede Goldman: US offshore engineering company known for semisubmersible and jackup designs including the ExD and Bingo families.
Friede Goldman ExD: Enhanced Pacesetter semisubmersible design used for several harsh-environment rigs.
FSIV: Fast Supply Intervention Vessel used for rapid crew and light cargo transfer in deepwater fields.
FSO: Floating storage and offloading unit, no processing.
FSRU: Floating storage and regasification unit for LNG import.

G

Gimi FLNG: BW Offshore-owned converted Moss-type LNG carrier serving as FLNG on the BP Greater Tortue Ahmeyim project.
Glomar Explorer: 1974 CIA covert deep-ocean salvage vessel for K-129 submarine wreck recovery.
Glomar Pacific: Historic Global Marine semisubmersible drilling rig.
Gusto MSC: Dutch offshore engineering firm whose designs include the CJ-70 jackup and various pipelay and crane vessels.
GustoMSC NG-2500X: GustoMSC liftboat design used by service providers in shallow water markets.
GustoMSC P-10000: GustoMSC ultra-deepwater drillship design used by Stena DrillMAX-class vessels.
Guyot 18000: GustoMSC drillship design optimized for ultra-deepwater drilling to 12,000 foot water depth.
GVA 4000: Goteborg Varv AB semisubmersible drilling rig design used by several second-generation rigs.
GVA 4500: Goteborg Varv AB harsh-environment semisubmersible drilling design.
GVA 7500: Harsh-environment semisubmersible design from GVA used by sixth-generation rigs such as Stena Carron.

H

Harvey Gulf SOV: Service Operation Vessel built by Eastern Shipbuilding for Harvey Gulf for US offshore wind work.
Helix Producer I: Helix Energy Solutions floating production unit working in the US Gulf of Mexico.
Helix Q5000: Helix Energy Solutions semisubmersible well intervention vessel with subsea intervention lubricator.
Helix Q7000: Helix Energy Solutions semisubmersible well intervention vessel based on a sixth-generation hull.
Hilli Episeyo: FLNG converted from 1975 Moss LNG carrier, deployed Cameroon for Perenco, capacity 2.4 mtpa.
HLCV: Heavy Lift Crane Vessel equipped with very high capacity revolving or sheerleg cranes for offshore installation.
HLV: Heavy Lift Vessel, a crane vessel capable of lifting foundations, jackets, or topsides for offshore wind and other sectors.
Hudong-Zhonghua: Shanghai shipbuilder under CSSC, LNG carrier specialist.
Hyundai Heavy Industries: HHI, Ulsan, world's largest shipbuilder by output.

I

IMO MODU Code: International Maritime Organization Code for Mobile Offshore Drilling Units, Chapter 9 covers helideck.
Inboard Skidding Cantilever: Cantilever skidding system enabling drilling across multiple platform wells.
Independent Leg Cantilever Jackup: Jackup with three independent legs and a cantilever-mounted drill floor for over-platform drilling.
Independent Variable Load Jackup: Jackup design class with high variable deck load supporting extended drilling campaigns.
Inflexible Riser: Steel catenary riser used for dynamic production from subsea wells to floaters.
Internal Turret: Turret mooring located within the FPSO hull, allowing weathervaning.
ISO 19901-7: International standard on station-keeping systems for floating offshore structures and mobile offshore units.
ISO 19904-1: International standard governing the design of floating offshore structures including ship-shaped and column-stabilized units.
ISO 19905-1: International standard for site-specific assessment of mobile offshore units, primarily jackups.

J

J-Lay: Pipeline installation method that lowers pipe vertically through a tower for deepwater rigid lines.
Jackup Rig: Self-elevating MODU with three or more legs that are lowered to the seabed to lift the hull above sea level.
Jansz-Io Subsea Tieback: Long-distance subsea production tieback to the Gorgon LNG plant in Australia.
Johan Castberg FPSO: Equinor-operated FPSO for the Johan Castberg field in the Barents Sea built by Sembcorp Marine.
Johan Sverdrup: Equinor's giant North Sea field developed using multiple fixed platforms rather than an FPSO.
JU-2000E: Friede Goldman JU-2000E enhanced 400 foot jackup design built primarily by Lamprell.
JU-3000N: Friede Goldman JU-3000N premium 400 foot harsh-environment jackup design.
Jurong Shipyard: Singapore yard part of Sembcorp Marine, building offshore and conversion projects.

K

Kaombo FPSO Project: Total project offshore Angola using two VLCC-conversion FPSOs operated by Saipem.
Kasawari CCS: Petronas Kasawari carbon capture and storage project tied back to floating production facilities offshore Sarawak.
Keppel B-Class: Keppel FELS-developed jackup design including the KFELS B Class with 400 foot water depth capability.
Keppel FELS: Singaporean offshore yard, parent of the former Keppel FELS BrasFELS at Angra dos Reis.
Keppel N Class: Keppel harsh-environment jackup design intended for North Sea-style operations.
Keppel Super B Class: Enhanced KFELS jackup design with greater cantilever reach and variable load than the base B Class.
KFELS Super A Class: Premium Keppel FELS jackup design with deeper rating and higher hookload than the B Class.
KFELS Super B Bigfoot: Enhanced Keppel FELS jackup design with extended cantilever reach.
Kraken FPSO: Bumi Armada FPSO operating on the Kraken heavy oil field for EnQuest in the UK North Sea.

L

LeTourneau 116E: Enhanced version of the classic LeTourneau 116-C jackup, a widely deployed Gulf of Mexico design.
LeTourneau 240C: Marathon LeTourneau deepwater jackup design rated to 400 foot water depth.
LeTourneau Super 116: Marathon LeTourneau 350 foot independent leg cantilever jackup design with high variable load.
LeTourneau Super Gorilla: Class of harsh-environment jackups including ENSCO 100-series rigs built for North Sea conditions.
Lewek Connector: Subsea construction vessel operated by EMAS-AMC, configured for reel-lay and heavy ROV operations.
Lewek Constellation: Heavy-lift, pipelay, and subsea construction vessel of EMAS Chiyoda Subsea.
Lifeboat FRB: Fast Rescue Boat carried on ERRVs for rapid offshore rescue duty.
Liza Destiny FPSO: Modec FPSO operating on the Liza field in the Stabroek Block offshore Guyana for ExxonMobil.
Liza Unity FPSO: SBM Offshore FPSO operating as the second producing unit on the Liza field in Guyana.
LNG Carrier Conversion FSRU: Modification of existing LNG carriers into FSRUs with onboard regasification.
LWIV: Light Well Intervention Vessel used for riserless subsea well intervention work.

M

MAERSK Drilling: Major offshore drilling contractor, now part of Noble Corporation.
Maersk Innovator: CJ-70 ultra-harsh-environment jackup built for Norwegian North Sea operations.
Maersk Inspirer: Cantilever production jackup operating as the Yme MOPU offshore Norway.
Maersk Venturer: Samsung-built drillship operated by Noble after the Maersk Drilling merger.
Maersk Voyager: Samsung-built drillship operated by Noble after the Maersk Drilling merger.
Maria Quiteria FPSO: Yinson FPSO operating on the Jubarte revitalization for Petrobras.
Mat-Supported Jackup: Jackup whose legs are connected to a single mat at the seabed, useful in soft mud bottoms.
MISC Berhad: Malaysian shipping company majority owned by Petronas, operator of around 30 LNG carriers including Seri series.
MODEC: Tokyo-based FPSO and FSO operator with units deployed offshore Brazil, West Africa and Asia.
MODU Code 2009: Updated IMO MODU Code adopted in 2009 covering modern mobile offshore drilling units.
MOPU: Mobile offshore production unit, often ex-MODU.
MOSS CS-50: Moss Maritime semisubmersible design used for several harsh-environment drilling rigs.
Moss CS-60: Moss Maritime sixth-generation semisubmersible design used by units such as Stena Don.
MRDU: Mobile Reservoir Drilling Unit, a generic shallow water rig descriptor occasionally used in industry literature.
MSC CJ-46: GustoMSC slim jackup design widely built in China and the Middle East.
Multipurpose Service Vessel: Offshore vessel combining ROV, light construction, well intervention, and survey capabilities.

N

N Class Jackup: Keppel FELS harsh-environment N Class jackup designed for Northern European waters.
N-2000 Floatel: GVA-derived semisubmersible accommodation unit design used in the North Sea.
NaviSemi: Generic semisubmersible class abbreviation used in industry naming for self-propelled column-stabilized units.
Noble Corporation: Major offshore drilling contractor.
Noble Discoverer: Former Frontier Discoverer drillship used in Arctic Alaska drilling.
Noble Don Taylor: Bully II-class drillship operated by Noble.
Noble Globetrotter: Bully-class enhanced drillship operated by Noble in deepwater plays.
Noble Voyager: Drillship in the Noble fleet inherited from Maersk Drilling, formerly Maersk Voyager.
North Sea Producer FPSO: Former Maersk-converted FPSO that operated on the MacCulloch field in the UK North Sea.

O

Ocean Endeavor: Diamond Offshore-built semisubmersible based on the Friede Goldman ExD design.
Ocean Patriot: Diamond Offshore second-generation semisubmersible operating in Australia.
Oceanic Olympia: Constellation Oil Services drillship operating offshore Brazil.
OCIMF MEG4: Standard reference on mooring of tankers and gas carriers.
OCIMF SIRE: Ship Inspection Report Programme used to vet tankers and shuttle tankers serving FSOs and FPSOs.
Odebrecht Oil & Gas: Brazilian drilling contractor merged into the broader Ocyan and Constellation entities.
Odfjell Drilling: Norwegian drilling contractor operating harsh-environment semisubmersibles such as the Aker Barents.
Odjfell Deepsea Stavanger: Moss CS-60-based harsh-environment semisubmersible operated by Odfjell Drilling.
Olympia FPSO: SBM FPSO under construction for the ExxonMobil Whiptail development offshore Guyana.
OOS International: Netherlands-based offshore operator running large semi-submersible accommodation and crane vessels.

P

P-51 Semisubmersible: Petrobras semisubmersible production platform on the Marlim Sul field.
P-55 Semisubmersible: Petrobras semisubmersible on the Roncador field, one of Brazil's largest semisubmersible producers.
P-67 FPSO: Petrobras FPSO on the Lula Norte field in the Santos Basin pre-salt cluster.
P-68 FPSO: Petrobras FPSO on the Berbigao and Sururu fields in the Santos Basin pre-salt cluster.
P-70 FPSO: Petrobras FPSO on the Atapu field in the pre-salt cluster.
P-71 FPSO: Petrobras FPSO on the Itapu field in the Santos Basin pre-salt cluster.
P-77 FPSO: Petrobras FPSO planned for the Buzios pre-salt cluster.
Pacesetter Semi: Friede Goldman second-generation Pacesetter semisubmersible drilling rig design.
Pacific Class 400: GustoMSC 400 foot harsh-environment jackup design used by Borr Drilling premium jackups.
Penguins FPSO: Shell-operated FPSO redevelopment of the Penguins cluster in the UK North Sea.
PetroRio: Brazilian independent that operates several converted FPSOs on mature Campos Basin fields.
PFLNG Dua: Petronas second floating LNG unit operating on the Rotan field offshore Sabah, Malaysia.
PFLNG Satu: Petronas-operated floating LNG vessel deployed offshore Sarawak, the world's first delivered FLNG unit.
Pile Driven Anchor: Mooring anchor consisting of a driven pile, used where suction or drag anchors cannot be installed.
Pioneering Spirit: Allseas dual-hull heavy-lift and pipelay vessel of 382 m length, capable of S-lay and J-lay.
Pipe Lay Vessel: Specialized vessel that fabricates and installs subsea pipelines using S-lay, J-lay, or reel-lay methods.
Plio Class: Generic semisubmersible accommodation unit class operated by floatel providers.
Polar Onyx: GC Rieber Shipping subsea construction vessel.
Polyester Mooring Line: Synthetic taut-leg mooring line with high strength-to-weight used for deepwater floaters.
Posted Barge: Drilling barge with posts that support the deck above the waterline for marshy inland water drilling.
Prelude FLNG: Shell-operated FLNG unit, the world's largest floating offshore facility at 488 m length, delivered by Samsung Heavy Industries in 2017.
Pride RBS-8M: Reading & Bates Pride-era enhanced semisubmersible design used for ultra-deepwater drilling rigs.
PSV: Platform supply vessel; cargo deck plus mud/brine/methanol tanks.

Q

Quadruple Activity Drillship: Conceptual ultra-high-spec drillship arrangement extending the dual activity concept.
Queiroz Galvao Oleo e Gas: Brazilian drilling contractor restructured into Constellation Oil Services.

R

R3 Studless Chain: Mooring chain grade R3 used in offshore catenary mooring systems.
R4 Studless Chain: Mooring chain grade R4 with higher strength used in deepwater taut-leg moorings.
R5 Studless Chain: Mooring chain grade R5 used in the highest demand deepwater mooring systems.
RBS-1 Semisubmersible: Reading & Bates first-generation column-stabilized drilling rig.
RBS-8D: Reading & Bates semisubmersible design used for Deepwater Horizon class rigs.
RBS-8M: Reading & Bates Falcon design ultra-deepwater semisubmersible.
Reel-lay: Pipeline installation from a vertical reel onto seabed.
Riserless Light Well Intervention: Subsea well intervention performed without a marine riser, using a subsea lubricator stack.
Rotinanga FLNG: Generic designation occasionally used in proposed FLNG developments in Asian basins.
ROVSV: ROV support vessel.
Rowan Gorilla VII: Marathon LeTourneau Gorilla-class jackup operated under the Valaris ARO Drilling joint venture.
Rowan Renaissance: Drillship inherited by Valaris from Rowan Companies.
Rowan Resolute: Drillship in the Valaris fleet inherited from Rowan.

S

S-Lay: Pipelay method using a stinger to control the overbend at the vessel stern and a sagbend at the seabed touchdown.
Saipem 10000: Saipem ultra-deepwater drillship operating worldwide.
Saipem 12000: Saipem Samsung-built sixth-generation drillship rated for 12,000 foot water depth.
Saipem 7000: Semi-submersible crane vessel capable of heavy-lift and J-lay pipelay operations, owned by Saipem.
Saipem FDS: Saipem field development ship, a pipelay vessel; included as marine logistics reference, with Saipem also building the cable lay vessel Saipem CastorOne.
SALM: Single anchor leg mooring; rigid riser column moored to single seabed anchor.
Saturno FPSO: SBM Offshore FPSO planned for the Saturno field for Equinor offshore Brazil.
SBM Offshore: Schiedam-headquartered FPSO operator and engineering contractor, the largest FPSO owner by fleet with around sixteen units.
Schahin: Brazilian drilling contractor that operated drillships including West Carina and West Eminence before financial restructuring.
Schiehallion FPSO: BP Glen Lyon FPSO replacing the original Schiehallion FPSO west of Shetland.
Schiehallion Glen Lyon: BP-operated FPSO west of Shetland that replaced the original Schiehallion FPSO.
Seadrill: Bermuda-based offshore drilling contractor with deepwater drillships and harsh-environment semisubmersibles.
Seatrium: Singapore-based offshore and marine group formed in 2023 from the merger of Sembcorp Marine and Keppel Offshore & Marine.
Sembcorp Marine: Singaporean offshore and shipbuilding group with Tuas Boulevard Yard.
Sembmarine Jurong Espadon 3000E: Jurong-designed drillship hull used by select operators.

Z

3rd Generation Semisubmersible: Semisubmersibles built in the late 1970s and 1980s for up to about 1,500 foot water depth.
4th Generation Semisubmersible: Semisubmersibles built in the mid-1980s through 1990s for up to about 3,000 foot water depth.
5th Generation Semisubmersible: 1998 to 2004 deepwater semisubmersibles such as Deepwater Nautilus and Eirik Raude.
6th Generation Drillship: Dual derrick, DP3, ultra-deepwater drillships such as the Discoverer Inspiration series.
6th Generation Semisubmersible: 2005 to 2011 ultra-deepwater semisubmersibles with DP3 station keeping.
7th Generation Drillship: Drillships with enhanced hookload, dual BOPs, and ratings to 12,000 foot water depth or greater.
7th Generation Semisubmersible: Latest semisubmersibles with dual BOPs, 20,000 psi BOP capability options, and enhanced variable loads.