COSL

What COSL does

COSL Drilling Europe AS is a Norwegian offshore drilling contractor established in 2005, headquartered in Sandnes, Norway, and operating as a wholly-owned subsidiary of China Oilfield Services Limited (COSL), which is listed on the Shanghai Stock Exchange. The company operates a fleet of four semi-submersible drilling rigs — COSLPioneer, COSLInnovator, COSLProspector, and COSLPromoter — all currently deployed on the Norwegian Continental Shelf under long-term firm contracts with Vår Energi and Equinor, with backlog visibility extending through 2030 on at least one unit. The fleet is built on a standardized rig design with common equipment and shared operating procedures, enabling crew flexibility and maintenance efficiencies, and is equipped with the company's proprietary Energy Control Systems that monitor and optimize energy consumption to reduce CO2 and NOx emissions. The company maintains ISO 9001, 14001, 45001, 50001, and 27001 certifications, positioning it within the low-emission contractor segment demanded by Norwegian operators' ESG mandates.

The company's revenue model is B2B long-term day-rate contracting with major oil and gas operators, with the go-to-market executed through direct enterprise engagement rather than intermediaries. Pricing is contract-specific and not publicly disclosed, and revenue is generated through multi-year firm periods with built-in extension options. Historically, the company has operated rigs in Norway, the UK, the Faroe Islands, and New Zealand, but has consolidated its entire active fleet in Norway, indicating a strategic refocus on its home basin. The customer base is narrow — effectively two named counterparties — and the company generates revenue through operational uptime and contract compliance rather than volume growth, since the rig count is fixed and fully contracted. Management is led by CEO Frank Tollefsen, with a leadership team spanning operations, finance, supply chain, market/contracts, QHSE, and HR, including recently appointed CFO Song Dingzhe (parent-company appointee, February 2024), reflecting the integration of COSL group oversight with Norwegian operational execution.

Name

COSL

Legal name

COSL Drilling Europe AS

Website

https://cosl.no

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

COSL Drilling Europe AS is a Norwegian offshore drilling contractor operating four standardized semi-submersible rigs under long-term contracts with Vår Energi and Equinor on the Norwegian Continental Shelf, wholly owned by Shanghai-listed China Oilfield Services Limited.

Ownership category

akta.pro rank

Product category

Offshore Drilling Services

NAICS

Drilling Oil and Gas Wells (213111)

SIC

Drilling Oil & Gas Wells (1381)

akta.pro primary industry

Drilling & Workover Rigs (Land & Offshore) (EUALABAA)

Keywords

• Offshore drilling services
• Semi-submersible rigs
• Oilfield services
• Norwegian Continental Shelf
• Drilling contractor

Headquarters

HQ city

Stavanger

HQ country

Norway

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D

Revenue model

1. Offshore Drilling Services: COSL generates revenue through long-term firm contracts with major oil and gas operators for offshore drilling services. Contracts include firm commitments with options for extension, providing revenue visibility. The company operates on day rates and contract-based pricing for drilling operations on the Norwegian Continental Shelf.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

COSL Drilling Europe AS is a Norwegian offshore drilling contractor that operates a fleet of four semi-submersible drilling rigs—COSLPioneer, COSLInnovator, COSLProspector, and COSLPromoter—providing contract drilling services primarily on the Norwegian Continental Shelf. The company is a wholly-owned subsidiary of China Oilfield Services Limited (COSL), which is listed on the Shanghai Stock Exchange, and is headquartered in Stavanger, Norway.

Product overview

COSL Drilling Europe is an offshore drilling contractor operating a fleet of four semi-submersible drilling rigs: COSLPioneer, COSLInnovator, COSLProspector, and COSLPromoter. The company provides offshore drilling services in the North Sea with a focus on low-emission operations. The rig portfolio features a standardized design with common equipment, flexible personnel, and shared operating procedures. Energy Control Systems are integrated across the fleet to monitor energy consumption and optimize operations, delivering substantial CO2 and NOx reductions. The company is committed to the energy transition with an ambition to deliver carbon neutral drilling operations in the near future.

Differentiator

Problem solved

Functional benefit

Brands

• COSL Pioneer: Drilling rig operating on Norwegian Continental Shelf for Vår Energi
• COSL Innovator
• COSL Prospector
• COSL Promoter

Products and services

• COSLPioneer
• COSLInnovator
• COSLProspector
• COSLPromoter

Quantifiable outcome

• Substantial CO2 and NOx reductions through Energy Control Systems
• +1 more outcomes

Named customers2 records

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Seadrill: Global offshore drilling contractor with a modern fleet of semi-submersibles and drillships serving North Sea and international oil majors. Directly competes with COSL for offshore drilling contracts on the Norwegian Continental Shelf and broader North Sea.
• Transocean: One of the largest offshore drilling contractors globally with a deepwater and harsh-environment rig fleet. Competes head-to-head with COSL for high-specification drilling work in the North Sea and other offshore basins.
• Valaris Limited: Diversified offshore drilling contractor operating floaters, jackups, and managed drilling solutions across multiple geographies including the North Sea. Direct competitor to COSL in semi-submersible and floater drilling tenders.
• Northern Ocean: Offshore drilling contractor with harsh-environment semi-submersible rigs operating in the North Sea. A focused floater operator directly comparable to COSL in fleet type and customer base.
• Odfjell Drilling: Norway-based offshore drilling contractor operating harsh-environment semi-submersibles primarily on the Norwegian Continental Shelf. A local peer and direct competitor for contracts with Equinor and other North Sea operators.
• Noble Corporation: Offshore drilling contractor operating a modern fleet including harsh-environment semi-submersibles. Post-Diamond merger, Noble has meaningful North Sea presence and competes with COSL for contracts with Equinor and other Norwegian operators.
• Stena Drilling: Offshore drilling operator with semi-submersible rigs active in the North Sea and internationally. Comparable to COSL in fleet type and North Sea focus.

Broad incumbents

• Saipem: Italy-headquartered integrated oilfield services and engineering company with drilling operations alongside EPCI services. Operates offshore drilling rigs in the North Sea and competes for integrated drilling and engineering work that COSL also targets.
• Diamond Offshore: Global offshore drilling contractor with semi-submersibles and drillships (now merged into Noble Corporation). Historical direct competitor to COSL in North Sea semi-submersible tenders; included as an established incumbent reference.
• Borr Drilling: Specialized shallow-water jackup drilling contractor with global operations. While primarily jackup-focused (versus COSL's semi-submersible focus), Borr is a relevant offshore drilling peer competing for the same major-operator contracts.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about COSL