Offshore Marine Riser Severance System
In subsea well blowouts, marine riser removal may be necessary to gain access for well capping. Traditionally this has been addressed using super shears. However, in shallow water blowouts, vertical access to deploy shears is not assured. To address this, Oil Spill Response Limited (OSRL) requested SPEX to develop an explosive cutting tool for a 21” marine riser. The tool would not require vertical access and would be deployable by ROV from a vessel 500m offset from the well location.
SPEX selected a pre curved linear shaped charge (LSC) solution centralised inside a two-part housing for positioning around the riser.
To achieve the required operational maximum depth, SPEX analysed and verified through pressure test, the design to 1.25x the working pressure.
Specifications:
Tool weight in air 97Kg
Tool weight in water 82Kg
Maximum working depth 12,500ft seawater (3,810m)
Target (marine riser) 21” OD, 1.188” WT
Please access the Data Sheets on this technology below:
Riser Severance System Data Sheet (English)
Riser Severance System Data Sheet (French)
Riser Severance System Data Sheet (Spanish)
