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Tortue Field Development Project


BP Tortue field development

Tortue field development project is a gas field project found in the Greater Tortue-Block area, the site lies between St. Louis Profond block off-shore Senegal and the C8 block in offshore Mauritania. Experts estimate this field to contain approximately 15 million ft cubic of recoverable gas.

However, industry experts also believe that the total acreage covering 33,000 square km could be holding 50 trillion cubic feet. This figure translates to the equivelent of Africa’s current gas generation capacity for the next 7 years.


The project’s C8 block is owned by a consortium of companies that include; BP 62pct, Kosmos Energy 28pct and Société-Mauritanienne des Hydrocarbures et -de Patrimoine Minier 10pct. Similarly, the Saint-Louis Profond block has BP as the largest shareholder, followed by Kosmos Energy, Timis Corporation and Société des Pétroles de Sénégal.

Kosmos Energy is acting as the operation’s exploration controller and should be applauded for their expertise discovering such a mammouth field. BP will use their wealth of experience of developing fields as they will be in charge of field development. The ultimate investment decision for the project would be done in 2018, whereas first production is expected to be underway by as soon as 2021.

Tortue Offshore Field Development

The offshore project involves producing vast amounts of gas found in very deep waters at depths of 2700m below sea level, the gas would be moved along 100km of flowlines to a modular suspended LNG production unit. The storage modules shall be situated at a recently built breakwater and expanded to full capacity over time.

Preliminary appraisal for the Greater Tourtue Complex project began in early 2016. Kosmos Energy later conducted a drill stem test (DST) on Tortue-1 well which was completed in August 2017.

The site evaluation’s success was because of utilising the firm’s proprietary expertise of the often unnoticed Upper Cretaceous design-stratigraphic play model to the region’s unique conditions, whereby sands by-passed the shelf and get deposited in much deeper waters.


In 2016, Kosmos signed an Mutual Understanding agreement with Petrosen and SMHPM, who are the national oil companies of Mauritania and Senegal. The contract stipulates the working principles pertaining a multinational cooperation agreement for creation of a cross-border resource. It allows the two countries and Kosmos Inc. to work mutually together towards fast development of the site, thereby increasing worth for all investors and parties involved in the project.

During the test, the gas-well flowed at a regulated rate of 60 million ft cubic per day with low pressure drawdown. The appraisal yielded the following results:

Tortue-1 in Mauritania

This site was initially drilled in mid-2015 and later renamed Ahmeyim, it encountered 117 meters of net hydrocarbon deposits in high-quality reservoir banks in the Albian and Cenomanian blocks. It became the industry’s largest natural gas find of 2015.

Guembeul-1 Senegal

Assessment for Guembeul-1 exploration well was officially completed in 2016, the venue encountered 101 meters of natural gas in two top quality reservoirs, as well as 45 meters in the neighboring Albian and 56 meters in Lower Cenomanian.


Furthermore, Guembeul-1demonstrated reservoir production stability and fixed pressure communication with Tortue-1 well in Lower Cenomanian. This venue was drilled about 5kms towards the southern part of Tortue-1 .

Ahmeyim-2 Mauritania

The Ahmeyim-2 well was excavated to an overall depth of 5,200 meters. Just as expected, it broke through the seismic-inferred gas/water contacts in Albian and the Lower-Cenomanian blocks. Ultimately describing the overall field limit and expanding the productive field range from 50sq.km to 90sq.km.

Tortue Gas West Field

In addition, the well confirmed considerable solidification of the total reservoir series down structure. Similarly, in the Lower-Cenomanian region there was static fluid pressure interaction between the Guembeul-1, Tortue-1 and Ahmeyim II wells. The project stumbled upon 78 meters of high grade gas spread across two top grade quality reservoirs, these are 46 meters in Lower-Cenomanian and 32 meters in the adjacent Albian. These results indicate field-wide gas reservoir continuity and also show that Tortue Gas West is a massive, simple-gas field.

Results from the above appraisals were used to create the field development plan and offered key parameters needed for front-end engineering and design (FEED).

Tortue Field Development Pre-FEED Contract

The pre-FEED contract of Tortue field development project was given to KBR, Inc. Additionally, work was expected to be done over a period of 6 months from the firm’s London office. The contract was awarded by BP and also covers development of the sub-sea, pre-treatment (FPSO) floating production storing & offloading facility. As well as inshore hub/terminal and interfaces for (FLNG) floating liquefied organic gas for Tortue Project.

According to KBR’s President for Africa, Jay Ibrahim, the company is ‘pleased to provide world-class engineering design skills to continue supporting this significant project.’Job opportunities will also be created by KBR for the pre-FEED project. Currently, the company employs 34,000 people globally and some of them will help in the Tortue field development contract. The pre-FEED project will be finalized by February 2019, with full production and exportation of gas expected to be underway 2yrs later.

Even more interestingly, the income derived from gas sales will help improve the economies of Mauritania and also Senegal. Not to mention both direct and indirect employment opportunities for locals across the two countries. The project is not only important for BP and Kosmos but also the two host nations. BP derives great satisfaction from knowing that they are not only serving their investors and customers, but also communities living around these projects.

In addition to the above plans, BP will continue building strong business relationships in the country, particularly supporting energy exploration and development activities. In April 2017, they strengthened their investment in Senegal by attaining 30pct minority participating stake at Timis Corporation which is working on two offshore blocks in Profond, Cayar Profond and Saint-Lois.

The company says they are planning a development which will last for 50yrs, one that will support a generation of young engineers just starting off in their careers. They’ll have the opportunity to work on the site and see it evolve to maturity.

In summary, the Tortue field development project is expected to meet energy demands across the world, which BP estimates to grow by 30pct between 2015 and 2035. Experts believe demand for natural gas will grow over the next coming years, but supply will also increase due to projects such as these ones. Once this development is complete, Mauritania and Senegal will enter the league of the world’s top gas producers.

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