| 摘要 |
<p>METHODS AND SYSTEMS FOR A BACKUP EMERGENCY DISCONNECT SIGNAL, EDS TRANSMISSION (250) IN AN OFFSHORE OIL AND GAS INSTALLATION ARE PROVIDED. A BACKUP EDS TRANSMISSION SYSTEM (250) INCLUDES A PRESSURE PULSE GENERATOR (180) LOCATED CLOSE TO A WATER SURFACE AND CONFIGURED TO GENERATE A PREDETERMINED PRESSURE VARIATION PATTERN INCLUDING AT LEAST ONE OF POSITIVE AND NEGATIVE PRESSURE PULSES AND CORRESPONDING TO AN EMERGENCY DISCONNECT SIGNAL (250), THE SIGNAL BEING PROPAGATED DOWNWARDS IN A MUD COLUMN (145). THE PRESSURE PULSE GENERATOR (180) IS LOCATED AT A SURFACE END OF THE MUD COLUMN (145). THE BACKUP EDS TRANSMISSION SYSTEM (250) ALSO INCLUDES A PRESSURE PULSE RECEPTOR (270) CONNECTED TO A CONTROLLER OF BLOWOUT PREVENTERS (106) AND CONFIGURED TO MEASURE A PRESSURE IN THE MUD COLUMN (145), AT A SUBSEA LOCATION. THE MOST ILLUSTRATIVE DRAWING IS</p> |
