Location: Nigeria

Platform Design: Conductor Supported Platforms

Key Features:

• 28m and 50m water depth
• 6 slots, 8 well slots
• 7.3m x 7.3m well configuration
• Single and double stacked structure supported platform designs
• 4 off 36” conductors providing structural support of the platform with 2 off 36” additional central well conductors leaving 2 remaining wells for future

Background

Aquaterra Energy were tasked to deliver two minimum facility platforms for offshore Nigeria.
The platforms were to act as unattended autonomous platforms, close linked to an FPSO, sending gross products through either a production or testing manifold. A gas lift was to be deployed onto the facilities to stimulate production when water cut began, automated switchover and throttling of this system was to be engineered as part of the solution.
Enhanced recovery using the digital oilfield principle was requested by project partners, managing the data received from the depletion of the reservoirs to make the best use of the marginal field.
We were required to drive local engagement through our engineering and operations to ensure the facilities could be operated and maximised through local engagement once commissioned.

Solution

We engineered a 2 x 2 bay subsea structure solution, the second of its kind in the world. It used our conductor supported platform solution, which was deployed to reduce cost, complexity, and time to first oil.

All local fabrication capacity was used and extended to deliver both platforms in tandem. We supported in further developing one facility in Lagos, to support longer term project and oilfield goals.

Our platform solutions included digital topside monitoring and control for the facilities by a global control and monitoring system. This supported in being able to trend analyse the depletion of reservoirs and manage efficiency of topside equipment.

Results

Both platforms were built simultaneously in Nigeria at two fabrication facilities in both Port Harcourt and in Lagos, maximising the local content capacity at each of the facilities. Our team supported with training and driving long term engagement with the local operations team.

The topside production facilities were engineered by a Nigerian team who focused on mechanical, piping, instrumentation and electrical design and engineering, verified by our core team in the UK.

Innovative structural design was used to reduce the steel requirement and remove complexity from the fabrication to develop more yard capacities within the country, and to remove entrained carbon from the design.

ESG Stats:

• 100% fabricated in-country
• Supported the redevelopment of a dockside fabrication site in Lagos
• Generated approximately 1m hours of local content hours of employment
• Zero LTIs
• Knowledge transfer and in-house training of platform and usability which supported enhanced skill set of local workforces
• Utilised existing in-country infrastructure for installation – creating savings on transportation emissions