Kosmos Energy has successfully completed the drill stem test (DST) of the Tortue-1 well located in water depths of approximately 2,700m, offshore Mauritania.

The well flowed at a sustained, equipment-constrained rate of approximately 60 million cubic feet per day (MMcf/d) during the main, extended flow period, with minimal pressure drawdown.

Kosmos Energy chairman and CEO Andrew Inglis said: “The positive results from the DST confirm that the Tortue field is a world-class resource and validates the assumptions that underpin our development concept.

“The combination of high well rates, large connected volume per well, together with a gas well-suited for liquefaction, is why we believe Tortue is one of the lowest cost pre-FID greenfield LNG projects.

“The Kosmos BP partnership remains aligned on delivering a final investment decision for the project in 2018 and first gas in 2021.”

The DST results validated the planned development scheme that will have a connected volume per well, which together with the high well rate is expected to result in a low number of development wells.

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By GlobalData
"The combination of high well rates, large connected volume per well, together with a gas well-suited for liquefaction, is why we believe Tortue is one of the lowest cost pre-FID greenfield LNG projects."

Preliminary analysis of fluid samples collected during the DST reveal that Tortue gas is well suited for liquefaction due to the low levels of liquids and negligible impurities.

Collected data will be analysed further to optimise field development, while necessary adjustments will be made to the design parameters essential for the front end engineering and design (FEED) process beginning later this year.

Atwood Achiever drillship carried out the DST and has been prepared for exploration drilling in the Hippocampe prospect in Block C-8, offshore Mauritania.

Kosmos is the exploration operator of Block C-8 with 28% participating interest.

BP owns 62% participating interest with operatorship, while Societe Mauritanienne des Hydrocarbures et de Patrimoine Minier holds 10%.