CH2M picks up Tortue work

10 October 2017, Week 40, Issue 710

CH2M has won marine engineering support work on the Tortue gas field development, offshore Mauritania and Senegal, the service company announced on October 5. Kosmos Energy discovered the Tortue in 2015, with BP buying into the area in December 2016. 


CH2M said the work covered subsea gas production, a floating treatment facility, a pipeline with domestic connection points and a nearshore hub, where production will be liquefied. The hub will provide breakwater-protected berths for a floating LNG (FLNG) unit. 

Pre-front-end engineering and design (pre-FEED) work by CH2M will help a final decision be made on the plan, including location, layout and construction method. 

KBR is handling engineering services for the development and chose CH2M. “CH2M has a strong civil and marine works portfolio for global energy producers, and we are pleased to perform a critical role working with KBR on this technically challenging project for BP,” said the company’s vice president, Colin Skipper. 

The company will carry out civil and marine engineering support for Tortue in the UK. 

A drill-stem test was carried out on the Tortue-1 well in August, with Kosmos reporting it had flowed at a constrained rate of 1.7 mcm per day, while being capable of flowing at around 5.66 mcm per day. The well was drilled in water depths of around 2,700 metres. 

Data from this test was to go into the FEED process, the US company said. A final investment decision (FID) on the LNG project is expected in 2018, with first gas in 2021. 

The Atwood Achiever drillship, which carried out the test, has gone on to drill the Hippocampe prospect, in Mauritania’s C-8 block. 

In addition to this major gas development, and exploration, BP and Kosmos have also agreed to work in other offshore areas. Evidence of this came on October 5, when Sao Tome & Principe’s Agencia Nacional do Petroleo (ANP) said the companies had applied for Blocks 10 and 13. As a result, the regulator said it was inviting other companies to submit their interest in the blocks. 

Kosmos is also working with Galp in Sao Tome’s Blocks 5, 6, 11 and 12. The US company’s management team has experience in the region, having been involved in discoveries in Equatorial Guinea. 

Edited by

Ed Reed


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