Rigs for the future
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Always do better is our guiding principle leading us through the energy transition and towards our vision of becoming the preferred supplier of drilling services. We are known for having the most efficient drilling units and a strong safety performance and culture.

COSL Drilling Europe was established in 2005, and has its head office located in Stavanger, Norway. Today we operate four modern drilling units. We have a solid owner with stable ratings in China Oilfield Services Limited, listed at the Shanghai Stock Exchange, with ambitions to strengthen its foothold in the North Sea.

Our four semi-submersible drilling rigs were delivered from the yard respectively in November 2010 (COSLPioneer), November 2011 (COSLInnovator), May 2012 (COSLPromoter) and November 2014 (COSLProspector). The first drilling operations started in Norway in August 2011 and COSL Drilling Europe has since then been in continuous operation drilling and completing wells in Norway, UK, Faroe Islands and New Zealand.

The drilling units are of a similar design and have all proven strong and consistent performance deliveries.

 

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COSL Drilling Europe is a low-cost drilling contractor committed to the energy transition by providing low-emission drilling rigs for the future - today.

 

Our rig portfolio has a proven track record of having the most efficient and best-performing rigs in the North Sea. COSL is setting a new standard in the North Sea with its energy efficiency. Our ambition is to deliver carbon neutral drilling operations within 2025.

 

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Management & Organisation

 
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Frank Tollefsen
CEO/President

  • A Mechanical Engineer with more than 33 years of experience in the oil industry, covering engineering, technical, project management, operations and senior management

  • Extensive experience working overseas covering all major oil-regions of the world including being responsible for major new-build programs and building up drilling contractors

  • Before joining COSL Drilling Europe in 2019 he spent four years in the combined position as CEO of Frigstad Engineering and COO of Frigstad Offshore

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Arild Stakkestad
VP Operations

  • Has more than 20 years of experience in the drilling and well industry 

  • After joining COSL Drilling Europe in 2010, he has held various positions within Operations Management, such as Rig Manager, Technical Advisor, SPS Project Manager and Assistant Rig Manager

  • Prior to joining COSL Drilling Europe he held the position as WCS Field Service Manager for Well Cementing Services at Schlumberger

  • Holds a BEng (Hons) in Offshore Engineering from Heriot-Watt University, Scotland, UK

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Kjetil Andrew Tangen
HSE&Q Director

  • Has more than 20 years of experience from working with QHSSE Management within the offshore drilling industry

  • Prior to joining COSL Drilling Europe AS he has held various positions within HSE both onshore and offshore in Norway and internationally

  • Holds a MSc in Environmental and Natural Resource Management from the Norwegian University of Science and Technology in Trondheim (NTNU)

  • Been with COSL Drilling Europe since 2008

 
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Osvald Borgen
HR & Administration Director

  • Holds a Bachelor of Management from the Business Academy in Stavanger

  • Has more than 30 years of experience from the oil industry, the last 15 years from various positions within HR management

  • Has worked with Transocean, Amec and Prosafe, and prior to joining COSL Drilling Europe in 2006 he spent two years at Odfjell Drilling

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Randi Skailand
Finance manager

  • Has a Master Degree in Business and Accounting from Norwegian School of Economics, NHH

  • Started her career as a consultant in Andersen Consulting in 1995, followed by a position as an auditor in PwC. In 1999 she joined ASO AS as a Business Manager

  • After ASO she held several managerial positions within finance and accounting for Halliburton As (six years) and Ocean Rig AS (five years) before starting her current role as Finance Manager in COSL Drilling Europe in 2012

Donald MacLeod
VP Market & Contract

  • Has 30 years of experience in the oil and gas industry, with a focus on remote locations worldwide.

  • Started in the industry offshore as a roustabout, progressing to Offshore Installation Manager before transitioning to onshore management positions.

  • Extensive Offshore / Onshore operational and management experience across multiple international assets and projects.

  • Held various onshore management positions, including Rig Manager, Operations Manager, VP of Operations, VP of Global Sales and Marketing, Company Director.

  • Been with COSL Drilling Europe since 2022.

 

Song Dingzhe
CFO

  • Holds a Bachelor of Economics and Finance from the Peking University in Beijing, China.

  • Joined COSL since 2005 after graduation from the university. Held various positions such as treasury manager，risk control manager in COSL HQ.

  • Worked as regional financial director in COSL Overseas Financial Center in charge of COSL Europe financial business.

  • Has more than 9 years of working experience in COSL Drilling Europe AS as treasury management, treasury & budget manager.

  • Started his current role as CFO in COSL Drilling Europe in February 2024

Yang Jingang

Yang Jingang
Assistant to President/CEO

  • Has more than 18 years of experience in the offshore drilling industry.

  • Has started his career with COSL Drilling Division after graduated from ChongQing petroleum university in 2003. 

  • Has wide management experience and knowledge from semi-submersible operations on- and offshore rig in offshore and also within the Market Department of COSL HQ.

 
 
 

COSL Drilling Europe AS
Head Office

Visiting Address
COSL Drilling Europe AS
Vestre Svanholmen 4
4313 Sandnes

Mailing Address
P.O. Box 34
4068 Stavanger

+47 51 95 09 00

post@cosl.no

Org nr 988 288 330

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Human Rights Due Diligence Assessment

CDE is committed to respect and support the internationally recognized Human Rights standards wherever we operate, and seek to ensure non-complicity in human rights abuses. We shall avoid infringing on the human rights of others and address adverse human rights impacts within our sphere of influence and activities.

CDE has compiled a report relating to our Human Rights Due Diligence as required through the Norwegian Transparency Act. The report is published here on our website.

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COSL Drilling Europe
UK Office (Aberdeen)

Visiting Address
iQ Building
15 Justice Mill Lane
Aberdeen, AB11 6EQ

COSL Drilling Europe
Head Office (Stavanger)

Visiting Address
Vestre Svanholmen 4
4313 Sandnes, Norway

Onshore Support
Centre

Visiting Address
Mongstad Sør Forsyningsbase
Hall W
5954 Mongstad, Norway

transport@cosl.no
+47 902 74 150

Company
Headquarters

Visiting Address
China Oilfield Services Limited P.O.Box 232
Beijing 101149
People's Republic of China 

www.cosl.com.cn