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• W2009135596 abstract "Abstract For subsea pumps, regular maintenance is required (in the order of every 5 years or so). Being able to plan this intervention to be just in time will reduce downtime, and optimize production. Such techniques have been applied to topside systems for a long time, and are now being extended to subsea pump systems. A data monitoring system with algorithms for monitoring certain Key Performance Indicators for a pumping system has been developed and applied, and is used to determine time to service. Two subsea pumping systems (for King and Lyell fields) are used as real examples, with results from system operation (Lyell) and integration testing (King) for same. Introduction Subsea pumps need regular maintenance due to general wear. The service interval depends on the operating conditions of the pump. Servicing a pump basically involves replacing it with a spare pump. Such intervention is preferably scheduled in order to minimize the downtime. An unscheduled intervention can easily give a downtime of one week and up to 8 weeks in winter in case of rough weather in certain areas, while a planned intervention can be done in 24 hours. As an example, a pump providing a production increase of 5 000 bpd, and with an oil prize of 50USD, the lost production will be at least 1.7 MUSD with a 1 week unplanned shut down. The lost production can be as much as 14 MUSD in case of having the pump installed in areas where a rough winter weather can make it impossible to change the pump (for an 8 week shutdown). For a planned 24 hour intervention, the corresponding production loss would be in the order of 0.25 MUSD. If we can avoid a single unplanned shutdown in good weather, we can thus save appr 1.5 MUSD. If we can avoid a single unplanned shutdown in areas where bad weather is critical, we may save 14 MUSD. The intervention can be done based on several schemes, g.:Run until it breaks. This gives 1-8 weeks downtime every timeChange every 4 years. This is based on worst case calculationsChange just in time. This is based on some knowledge of condition Compared with how a car is serviced, option a) is seldom used. Option b) (scheduled on time / mileage) is the most common method. Option c) is used on more advanced cars, which keep track on how hard they are driven, and give advance warning on how many miles are left until service is required. What we are discussing is thus basically what advanced car manufacturers have done for many years, i.e. scheduling maintenance based upon how hard the system is operated. Also, in the same way as for cars, regular maintenance can-not guarantee against unscheduled breakdowns, but it will reduce the risk for such. In order for such a system to give any real benefit, it must be able to give sufficient advance warning that a planned intervention can be made instead of an unscheduled one." @default.
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• W2009135596 date "2007-04-30" @default.
• W2009135596 modified "2023-10-05" @default.
• W2009135596 title "Subsea Pumping Systems: Intervention Prediction and Condition Monitoring Techniques" @default.
• W2009135596 doi "https://doi.org/10.4043/18537-ms" @default.
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