Ocean Rig
Former international contractor operating deepwater drillships and semi-submersible offshore drilling rigs.
Last updated August 31, 2026
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Overview
Ocean Rig was an offshore drilling contractor established in 1996 as Ocean Rig ASA. The company specialized in drilling services for the international oil and gas industry, with an emphasis on deepwater and ultra-deepwater operations. Its fleet included semi-submersible drilling platforms and dynamically positioned drillships capable of working in challenging offshore environments. The business developed as a publicly traded offshore-services company. It was listed on the Oslo Stock Exchange from 1997 until 2008. In 2010, Ocean Rig shares were spun off by DryShips and the company became listed on NASDAQ. DryShips remained its majority owner, and the company was associated with Greek shipping executive George Economou, who controlled DryShips. Ocean Rig's operating portfolio included two semi-submersible rigs and four ultra-deepwater drillships. These units were contracted to exploration and production companies for drilling wells in frontier and mature offshore basins. The company's work involved both conventional deepwater drilling and operations in technically demanding regions. Its fleet participated in projects connected with clients including Petrobras, Türkiye Petrolleri Anonim Ortaklığı, and Cairn Energy, among others. The company's operating history included assignments in the Black Sea and Arctic waters. In 2011, the Leiv Eirikson completed work in the Black Sea under contracts associated with Petrobras and TPAO before moving to the Arctic for a contract with Cairn Energy. These assignments reflected Ocean Rig's positioning in specialized offshore drilling rather than shallow-water or land-based services. Ocean Rig faced severe financial pressure during the offshore drilling downturn. It filed for protection under United States bankruptcy law in March 2017. The restructuring was completed in September of that year. Following the reorganization, Pankaj Khanna became President and Chief Executive Officer effective January 1, 2018. The company nevertheless remained part of a highly consolidated and financially stressed offshore-rig market. Transocean acquired Ocean Rig in December 2018. The transaction ended Ocean Rig's independent existence as a listed offshore drilling contractor and integrated its assets and operations into Transocean, one of the world's largest offshore drilling companies. As a result, Ocean Rig is now best understood as a former drilling-services brand and corporate entity rather than an active standalone operator.
History
Ocean Rig was formed in 1996 as Ocean Rig ASA to operate offshore drilling assets for the international oil and gas sector. Its business model centered on specialized rigs used in deepwater and ultra-deepwater exploration and development. Unlike land drilling contractors, Ocean Rig operated mobile offshore units that could be deployed between basins and contracted to different exploration and production companies. The company became a public company early in its development. It was listed on the Oslo Stock Exchange between 1997 and 2008. In 2010, its shares were spun off by DryShips, after which Ocean Rig was listed on NASDAQ. DryShips remained the majority owner, and the relationship connected Ocean Rig with the business interests of George Economou, who controlled DryShips. Ocean Rig's fleet was described as comprising two semi-submersible drilling platforms and four ultra-deepwater drillships. Its assets were designed for offshore projects requiring substantial water depth and advanced drilling capability. The company pursued work across several international regions, including the Black Sea and Arctic areas. In 2011, the Leiv Eirikson completed operations in the Black Sea on contracts associated with Petrobras and Türkiye Petrolleri Anonim Ortaklığı before proceeding to the Arctic under a contract with Cairn Energy. The offshore drilling market deteriorated significantly during the mid-2010s as oil prices weakened, exploration spending declined, and the industry experienced an oversupply of drilling rigs. Ocean Rig filed for bankruptcy protection in the United States in March 2017. Its reorganization was completed in September 2017. The restructuring preserved the operating business but did not remove the broader market pressures affecting offshore contractors. Effective January 1, 2018, Pankaj Khanna became President and Chief Executive Officer. Later that year, Transocean agreed to acquire Ocean Rig. The acquisition was completed in December 2018 and transferred Ocean Rig's assets and operations into Transocean. The transaction marked the end of Ocean Rig as an independent listed company and explains its present classification as a defunct standalone brand. Its historical importance lies in its fleet of deepwater drilling units, its participation in technically demanding offshore projects, and its role in the consolidation of the offshore drilling industry.
- 2018
Pankaj Khanna becomes chief executive
[1]Pankaj Khanna becomes President and CEO effective January 1.
- 2018
Acquisition by Transocean
[1]Transocean acquires Ocean Rig in December, bringing the company's fleet and operations into Transocean.
- 2017
United States bankruptcy filing
[1]Ocean Rig files for bankruptcy protection in the United States in March amid offshore-market distress.
- 2017
Reorganization completed
[1]The company's bankruptcy reorganization is completed in September.
- 2011
Leiv Eirikson changes operating regions
[1]The Leiv Eirikson completes Black Sea work connected with Petrobras and TPAO before moving to the Arctic for Cairn Energy.
- 2010
DryShips spin-off and NASDAQ listing
[1]Ocean Rig shares are spun off by DryShips and the company becomes listed on NASDAQ.
- 2008
Oslo listing ends
[1]Ocean Rig's listing on the Oslo Stock Exchange ends after approximately a decade of trading.
- 1997
Listing on the Oslo Stock Exchange
[1]Ocean Rig begins a period of public trading on the Oslo Stock Exchange that continues until 2008.
- 1996
Ocean Rig is established
[1]The company is established as Ocean Rig ASA to operate offshore drilling assets.
Products and positioning
Specialist deepwater and ultra-deepwater offshore drilling contractor serving international oil and gas exploration and production companies.
Offshore drilling vessels
Ultra-deepwater drillships
Ocean Rig operated four ultra-deepwater drillships used for mobile offshore drilling contracts. These vessels were intended for technically demanding exploration and development wells in substantial water depths and could be mobilized between international offshore markets.
Offshore drilling platforms
Semi-submersible drilling platforms
The company owned and operated two semi-submersible drilling units. Semi-submersibles are floating offshore platforms designed to maintain stability in open-water conditions and support drilling operations in deepwater environments.
Contract drilling services
Deepwater drilling services
Ocean Rig provided contract drilling services to oil and gas exploration and production companies. Its work included the deployment of offshore rigs for exploration, appraisal, and development drilling in regions such as the Black Sea and Arctic.
Brand decisions
2018
Acquisition by TransoceanM&ABackground
Ocean Rig was a deepwater drilling contractor with a fleet comprising two semi-submersibles and four ultra-deepwater drillships, while the offshore drilling industry was undergoing consolidation.
Action taken
Transocean acquired Ocean Rig in December 2018.
Aftermath
Ocean Rig ceased to operate as an independent corporate entity, and its assets and operations became part of Transocean.
2017
Court-supervised financial reorganizationOtherBackground
Ocean Rig faced financial stress during the downturn in the offshore drilling market and filed for bankruptcy protection in the United States in March 2017.
Action taken
The company used bankruptcy proceedings to restructure its obligations and reorganize the business. The reorganization was completed in September 2017.
Aftermath
Ocean Rig continued operating after the restructuring but remained exposed to weak offshore-rig market conditions. Pankaj Khanna became President and CEO effective January 1, 2018.
Recent events
- 2018
Pankaj Khanna becomes President and CEO[1]
Leadership change
Pankaj Khanna assumed the roles of President and Chief Executive Officer effective January 1, 2018, following the company's restructuring.
- 2018
Transocean acquires Ocean Rig[1]
M&A
Transocean acquired Ocean Rig in December 2018, ending Ocean Rig's independent corporate existence and bringing its deepwater fleet into the Transocean organization.
- 2017
Ocean Rig files for bankruptcy protection in the United States[1]
Bankruptcy
Ocean Rig entered bankruptcy proceedings in March 2017 during the prolonged downturn in the offshore drilling market. The process was intended to restructure the company's financial obligations and support continued operations.
- 2017
Ocean Rig completes bankruptcy reorganization[1]
Bankruptcy
The company's financial reorganization was completed in September 2017, allowing Ocean Rig to continue operating after its court-supervised restructuring.
Sources1 sources
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