OPERATIONS

New depth record for electro-hydraulic subsea tree

THE Expro Group has deployed its electro-hydraulic EXpress deepwater sub sea test string in a water depth of 2040m during recent well testing operations on BP's Plutao 1a Well in Block 31 offshore Angola.

The EXpress system was deployed, operated and retrieved successfully during the six day test on the Leiv Eiriksson DP vessel in August.

The Expro Group specifically developed its EXpress technology to meet the stringent safety and operational requirements of deepwater applications.

"As operators exploit ever increasing water depths, traditional direct hydraulic controlled subsea systems are unable to deliver the system shut in and disconnection response times required to match dynamically positioned drilling vessel.

The system combines Expro's field proven Deepwater Vent Pack technology with an electro-hydraulic control system to deliver superior response performance.

The system offers depth independence, where an electrical signal is used to activate the subsea system, removing the inherent depth time lag associated with hydraulic systems.

During the operation, full emergency disconnect trials were conducted using the primary electrical system controlled from the driller's remote unlatch switch and the main Surface Electrical Control Panel. Trials using both stations resulted in controlled shut-in and disconnection times of nine seconds.

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