Retrofit platform supports offshore Bahrain appraisal drilling
2H Offshore has delivered a retrofit conductor supported platform for Bahrain state oil company Bapco and Schlumberger.
This allowed an appraisal well offshore Bahrain to be transitioned to production in 26 m (85 ft) water depth within six months of project award.
2H Offshore designed a tripod CSP supporting three surface trees, with a total work area of 90 sq m (969 sq ft).
The platform had to be clamped retrospectively onto the drilled conductor under an already installed surface tree.
Additional conductors were driven to provide support for the CSP, allowing two potential future wells. The structure comprised a subsea template, a top platform, top brace structure, single deck and boat landing.
Keeping the structures small reduced transportation costs and allowed use of Shelf Drilling’s jackup rigKey Hawaii for the installation, 2H Offshore said, avoiding the need to mobilize a dedicated installation vessel.
In addition, 2H Offshore managed fabrication and supervised offshore installation on-site in Bahrain, subcontracting various duties to Arab Shipbuilding & Repair Yard, Bureau Veritas, and 2H sister companies Claxton Engineering and Seatronics.
Hassan Saleh, Principal Engineer at 2H Offshore, said: “Completing this project within the tight timeframe despite the challenge of retrofitting it under an installed tree, shows that with the right design and excellent network, a fasttrack, light-weight, retrofit structure is an excellent choice for many shallow water fields.”