ANTI-RECOIL CONTROL DESIGN USING A HYBRID RISER TENSIONING SYSTEM IN DEEPWATER DRILLING

摘要

The riser data logging system may be installed on top of the riser to provide information of the riser in real time instead of or in addition to relying on sensors installed in the tensioner. The riser recoil detection system can be manufactured independently of any movement of the ship. This logging system can feed back the riser top acceleration, velocity and position and wireline tension to the controller. By comparing the difference in acceleration between the riser top and the ship body, the controller can more reliably and quickly detect events occurring on the ship, potentially detecting the condition within one second. If the acceleration exceeds an arbitrary limit value, the electric tensioners can reduce the wire line tension almost simultaneously, thereby providing anti-rebound control more effectively than conventional hydro-pneumatic tensioners.