REMOTE SAFETY SHUTDOWN FOR A MONOPOD PLATFORM

THE ZARIS EL-BIBAN WELLHEAD TOWER IS LOCATED 18KM OFFSHORE TUNISIA. IT CONSISTS OF A SINGLE CHRISTMAS TREE AND PIG LAUNCHING FACILITIES WITH AN EXPORT PIPELINE TO THE ONSHORE TERMINAL. THE TOWER IS CURRENTLY FITTED WITH NAVIGATION AID FACILITIES.

THE SYSTEM SUPPLIED IS A CONTROL AND SAFETY SYSTEM, WHICH ALLOWS CONTROL OF THE WELL FROM THE ONSHORE TERMINAL AND SHUTDOWN OF THE WELL IN THE EVENT OF A FIRE OR LOW FLOWLINE PRESSURE.

THE AIM OF THE DESIGN IS TO PROVIDE A RELIABLE, LOW MAINTENANCE SYSTEM THAT IS SIMPLE TO OPERATE BOTH LOCALLY AT THE WELLHEAD TOWER, AND REMOTELY FROM THE ONSHORE TERMINAL.

THE SYSTEM UTILISES A COMBINED CONTROL AND SAFETY SYSTEM, WHICH GIVES GREATER OPERATIONAL FLEXIBILITY OVER SEPARATE CONTROL AND SAFETY SYSTEMS. THE INTEGRATION OF THE TWO SYSTEMS ALSO MEANS A GREATER LEVEL OF DIAGNOSTICS INFORMATION IS AVAILABLE TO THE REMOTE OPERATOR REGARDING THE STATUS OF THE SHUTDOWN SYSTEM. THE SYSTEM FAILS INTO A SAFE STATE ON FAILURE OF THE CONTROL/SAFETY SYSTEM.

THE SYSTEM ENTIRELY OPERATES FROM BATTERIES, WHICH ARE RECHARGED FROM SOLAR PANELS.

THE SYSTEM HAS BEEN DESIGNED FOR A LIFE OF 20 YEARS.

THE SYSTEM CONSISTS OF: -

  • ONSHORE SCADA SYSTEM FOR MONITORING AND CONTROL OF THE PLATFORM
  • RADIO LINK (INCLUDING TRANCEIVERS AT ONSHORE AND OFFSHORE ENDS)
  • OFFSHORE CONTROLS CABINET CONTAINING ELECTRO-HYDRAULIC CONTROLLERS
  • HYDRAULIC POWER GENERATION UNIT AND WELLHEAD CONTROL VALVES
  • FIRE DETECTION SYSTEM
  • SOLAR PANELS AND BATTERIES
  • INTERFACE WITH NAVAIDS SYSTEM (STATUS MONITORING AND FOG HORN ACTIVATION)

THE SYSTEM ALLOWS THE ONSHORE OPERATOR TO:

  1. MONITOR THE WELLHEAD AND FLOWLINE PRESSURES
  2. MONITOR THE HYDRAULIC CONTROL SYSTEM
  3. MONITOR THE STATUS OF THE NAVIGATION AIDS SYSTEMS, AND SOLAR SYSTEM
  4. OPEN AND CLOSE THE XMAS TREE WING VALVE

IN ADDITION THE OPERATOR WILL ALSO BE ABLE TO CLOSE THE DOWNHOLE VALVE AND MASTER VALVE. AUTOMATIC SHUTDOWN IS INITIATED BY FIRE DETECTION, ABNORMAL FLOWLINE PRESSURES OR LOCAL ESD PUSHBUTTON INPUT.

Ocean Technical Systems Ltd.
P.O.Box 752, Sutton, Surrey, U.K. SM2 7RQ
Tel: +44 (020) 8643-2233 Fax: +44 (020) 8643-6444
e-mail: oceantech@oceantechsys.com


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