OneSubsea

OneSubsea is a subsea technology and services business focused on equipment, systems, and lifecycle support for offshore oil and gas production. The company originated in 2012 as a joint venture between Cameron International and Schlumberger, with Cameron holding a 60% interest and Schlumberger holding 40%. The venture combined Cameron’s subsea production equipment capabilities with Schlumberger’s reservoir, drilling, completion, and oilfield-services expertise. The company supplies technologies used between the seabed and offshore production facilities. Its scope includes subsea production systems, subsea processing systems, subsea trees, wellhead-related equipment, subsea umbilicals, risers and flowlines, and services intended to support subsea assets over their operating lives. These systems are used to control and produce subsea wells, transport production fluids, manage pressure and flow, and improve the economics and operability of offshore fields. OneSubsea also participates in subsea well-intervention activities and related service arrangements. OneSubsea’s business model has developed through partnerships and alliances rather than through equipment sales alone. In 2015, it joined Schlumberger and Helix in the Subsea Services Alliance, which was intended to develop technologies and provide equipment and services for subsea well intervention. The same year, OneSubsea and Subsea 7 formed a non-incorporated alliance covering subsea production systems, subsea processing, SURF systems, and life-of-field services. These arrangements positioned the company as part of broader integrated project teams capable of combining subsea hardware, installation, intervention, engineering, and operational support. In 2015, Schlumberger announced the acquisition of Cameron, including its interest in OneSubsea, in a transaction valued at $14.8 billion. Following the acquisition, OneSubsea became associated with Schlumberger’s broader oilfield-services portfolio and later with the SLB corporate group. In 2022, SLB announced a new joint-venture structure involving Aker Solutions and Subsea7. Under that arrangement, SLB holds 70% of OneSubsea, Aker Solutions holds 20%, and Subsea7 holds 10%. The company has continued to pursue subsea production and processing projects, including a 2015 contract connected with Shell’s Stones development in the Gulf of Mexico. In 2024, OneSubsea was selected to perform front-end engineering and design work for Equinor’s Fram-Sør all-electric subsea tree project. The project reflects the industry’s interest in reducing subsea system complexity, improving remote operability, and lowering the energy and emissions intensity associated with offshore production. As of August 2024, OneSubsea was described as the world’s largest company by installed subsea Christmas-tree base. Its competitive position rests on installed equipment, subsea engineering expertise, integration with SLB’s energy technology portfolio, and relationships with offshore operators, installation contractors, and engineering companies. Although its historical core is the subsea oil and gas market, its technology portfolio is also relevant to broader offshore energy infrastructure and to efforts to make subsea operations more automated and electrically powered. OneSubsea remains an operating business within a multi-owner structure rather than an independently traded public company.

OneSubsea was created in November 2012 when Cameron International and Schlumberger announced a joint venture dedicated to subsea technologies and services. Cameron managed the venture and held a 60% interest, while Schlumberger retained 40%. The structure brought together Cameron’s established subsea equipment business and Schlumberger’s broader oilfield-services and subsurface expertise. OneSubsea was therefore conceived as a specialist platform for supplying integrated systems to offshore oil and gas projects rather than as a stand-alone consumer-facing brand. The company expanded its service and technology relationships in 2015. In January, OneSubsea, Schlumberger, and Helix created the Subsea Services Alliance. The alliance focused on subsea well intervention, with the stated aim of developing technologies and delivering equipment and services across the intervention value chain. In July of the same year, OneSubsea and Subsea 7 announced a non-incorporated alliance. Its scope included subsea production systems, subsea processing systems, subsea umbilicals, risers and flowlines, and life-of-field services. These arrangements reflected a move toward integrated subsea delivery models in which equipment suppliers and offshore contractors jointly address engineering, installation, intervention, and long-term operations. OneSubsea also secured project work during this period. In August 2015, it was awarded a contract to supply subsea processing systems for Shell’s Stones development in the Gulf of Mexico. Stones was an important example of the type of deepwater development for which subsea processing and production technology is used to manage offshore wells and move produced fluids toward surface facilities. A major corporate change followed in August 2015, when Schlumberger announced its acquisition of Cameron in a transaction valued at $14.8 billion. Because OneSubsea had been established as a Cameron-Schlumberger joint venture, the acquisition changed the company’s ownership context and placed it within Schlumberger’s wider oilfield-services organization. The OneSubsea name continued to identify the subsea-focused business, while Schlumberger provided the larger corporate platform and complementary technology base. In August 2022, SLB announced a new joint-venture arrangement involving OneSubsea, Aker Solutions, and Subsea7. The announced ownership was 70% for SLB, 20% for Aker Solutions, and 10% for Subsea7. The arrangement broadened the company’s industrial backing by combining SLB’s subsea and energy-technology activities with Aker Solutions’ engineering and project capabilities and Subsea7’s offshore installation and field-development expertise. OneSubsea’s portfolio covers subsea production systems, subsea processing, subsea trees, well-related equipment, SURF-associated systems, and services supporting installed equipment throughout the field life. Its customer base consists primarily of offshore oil and gas operators and project partners. The company’s role can range from supplying discrete subsea equipment to participating in integrated field-development and lifecycle-service arrangements. The business has also pursued electrification and new subsea architectures. In July 2024, OneSubsea was announced as the front-end engineering and design provider for Equinor’s Fram-Sør all-electric subsea tree project. All-electric subsea equipment is intended to reduce reliance on hydraulic control infrastructure and may support more efficient, remotely operated, and lower-emission subsea systems. This work illustrates how OneSubsea is applying its established production-equipment position to technology development aimed at improving offshore system performance. As of August 2024, reference material described OneSubsea as the world’s largest company by installed subsea Christmas-tree base. Its history is consequently characterized by joint-venture formation, integration into SLB, strategic alliances with intervention and offshore-construction specialists, and continued development of subsea production and processing technologies. The company remains active and is headquartered in Oslo, Norway, and Houston, Texas, United States.

• 2024

  Fram-Sør all-electric subsea tree engineering project

  [1]OneSubseaen.wikipedia.org

  OneSubsea was selected to perform front-end engineering and design for Equinor’s Fram-Sør all-electric subsea tree project.

• 2022

  New multi-owner joint venture announced

  [1]OneSubseaen.wikipedia.org

  SLB announced an ownership structure for OneSubsea involving SLB, Aker Solutions, and Subsea7 at 70%, 20%, and 10%, respectively.

• 2015

  Subsea Services Alliance established

  [1]OneSubseaen.wikipedia.org

  OneSubsea, Schlumberger, and Helix formed an alliance focused on subsea well-intervention technologies, equipment, and services.

• 2015

  Alliance with Subsea 7 announced

  [1]OneSubseaen.wikipedia.org

  OneSubsea and Subsea 7 created a non-incorporated alliance covering subsea production, processing, SURF, and life-of-field activities.

• 2015

  Shell Stones contract awarded

  [1]OneSubseaen.wikipedia.org

  OneSubsea received a contract to supply subsea processing systems for Shell’s Stones development in the Gulf of Mexico.

• 2015

  Schlumberger announces Cameron acquisition

  [1]OneSubseaen.wikipedia.org

  Schlumberger announced its $14.8 billion acquisition of Cameron, changing the ownership context of OneSubsea.

• 2012

  OneSubsea joint venture announced

  [1]OneSubseaen.wikipedia.org

  Cameron International and Schlumberger announced OneSubsea, with Cameron holding 60% and Schlumberger 40%.

An integrated subsea technology and services provider for offshore oil and gas operators, combining subsea production hardware, processing, intervention, SURF-related capabilities, and lifecycle support. The company emphasizes large installed equipment bases, project integration, and technologies designed to improve subsea production efficiency and operability.

• Subsea oil and gas equipment

  Subsea production systems

  Subsea production systems provide the equipment and controls used to produce hydrocarbons from wells located on the seabed. OneSubsea’s offering is associated with integrated field-development architectures that connect subsea wells to flowlines, risers, processing equipment, and host facilities. The systems are designed for offshore operating conditions and can be combined with installation, commissioning, intervention, and lifecycle services.

• Subsea well-control equipment

  Subsea Christmas trees

  Subsea Christmas trees are assemblies installed over subsea wells to control production and injection flows, provide well access, and interface with control and flowline systems. They are central to subsea field development because they must operate reliably under water, pressure, and temperature constraints. OneSubsea has a substantial installed base of these systems and was described in 2024 reference material as the world’s largest company by installed subsea Christmas-tree base.

• Subsea production and processing

  Subsea processing systems

  Subsea processing systems perform selected separation, boosting, or fluid-management functions on or near the seabed. By treating or assisting production before fluids reach the surface facility, these systems can support longer tiebacks, improve recovery from offshore fields, and address flow-assurance or pressure-management requirements. OneSubsea supplied subsea processing systems for Shell’s Stones development in the Gulf of Mexico.

• Subsea field infrastructure

  Subsea umbilicals, risers, and flowlines

  Umbilicals, risers, and flowlines connect subsea wells and equipment with one another and with offshore production facilities. Umbilicals carry control, power, and chemical-injection functions, while flowlines transport produced fluids and risers provide the vertical connection to the host facility. OneSubsea’s alliance scope with Subsea 7 included SURF-related systems, reflecting its participation in integrated subsea infrastructure solutions.

• Subsea electrification · 2024

  All-electric subsea tree systems

  All-electric subsea tree systems replace or reduce hydraulic control elements with electrically actuated and controlled equipment. The approach is intended to simplify control architectures, improve monitoring and remote operation, and potentially reduce energy use and emissions associated with subsea production systems. In 2024, OneSubsea was selected for front-end engineering and design work on Equinor’s Fram-Sør all-electric subsea tree project.

• Subsea services · 2015

  Subsea well-intervention systems and services

  Subsea well-intervention systems and services support maintenance, remedial work, and production optimization without necessarily requiring a full conventional drilling-rig intervention. OneSubsea’s participation in the Subsea Services Alliance with Schlumberger and Helix was aimed at developing and delivering technologies and services for this part of the subsea value chain.

• 2015Subsea Services Alliance

  Global subsea oil and gas markets

  OneSubsea, Schlumberger, and Helix formed the Subsea Services Alliance to develop well-intervention technologies and provide associated subsea equipment and services.

  Outcome. The alliance expanded OneSubsea’s role from subsea equipment supply toward coordinated well-intervention solutions and lifecycle support.

  Source
• 2015OneSubsea–Subsea 7 alliance

  Offshore oil and gas · Subsea field development

  OneSubsea and Subsea 7 established a non-incorporated alliance focused on subsea production and processing, SURF systems, and life-of-field services.

  Outcome. The arrangement combined subsea equipment and processing capabilities with offshore engineering, installation, and lifecycle-service capabilities.

  Source

• 2024

  Advance all-electric subsea tree developmentGeneration change

  Background

  Offshore operators have been pursuing more electrically controlled and remotely operable subsea systems.

  Action taken

  OneSubsea was awarded front-end engineering and design work for Equinor’s Fram-Sør all-electric subsea tree project.

  Aftermath

  The project placed OneSubsea among suppliers developing lower-complexity and potentially lower-emission subsea production architectures.

  Source

• 2022

  Establish a new joint-venture ownership structureM&A

  Background

  SLB announced a partnership structure intended to bring Aker Solutions and Subsea7 into OneSubsea’s ownership group.

  Action taken

  The announced ownership allocation gave SLB 70%, Aker Solutions 20%, and Subsea7 10%.

  Aftermath

  OneSubsea gained two additional strategic owners with engineering, project-delivery, and offshore-installation capabilities.

  Source

• 2015

  Acquire Cameron InternationalM&A

  Background

  Schlumberger announced a broader corporate combination with Cameron, whose business included the OneSubsea venture.

  Action taken

  Schlumberger announced the acquisition of Cameron in a transaction valued at $14.8 billion.

  Aftermath

  OneSubsea became part of the Schlumberger corporate structure and its wider oilfield-services portfolio.

  Announced transaction value. $14.8 billion (2015 announcement)

  Source

• 2012

  Create a Cameron–Schlumberger subsea joint ventureStrategy

  Background

  The two oilfield-equipment and services companies sought to combine complementary subsea and oilfield capabilities in a dedicated business.

  Action taken

  They formed OneSubsea, with Cameron managing the venture and holding 60%, while Schlumberger held 40%.

  Aftermath

  OneSubsea became a dedicated supplier of subsea production, processing, and related services.

  Source

1. 1OneSubseaen.wikipedia.org