FEATURE: KONGSBERG Before
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48,4027 69.0 54.0
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36,5863 52.3
with old piping infrastructure needed to demonstrate that the infrastructure could be operated safely and within design constraints. Kongsberg simulated the network, collecting the necessary data from the original construction diagrams. The simulator was then used to verify operating procedures and demonstrate to authorities that the network was safe to operate.
Tiebacks and Old Pipes
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24,7600 18.06.2002 09:01:58 18.06.2002 10:15:14 18.06.2002 11:28:30 09.7 After
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18.06.2002 09:01:58 18.06.2002 10:15:14 18.06.2002 11:2 Modifications and More Modifications Why Dynamic Simulation?
Dynamic simulators represent the production process as a single interconnected system. This allows you to discover unexpected and often surprising features of process behaviour. For example, a lot of unstable operations can be caused by interaction between control loops. We have seen operating processes where two controllers were trying to control, in effect, the same pressure. These controllers naturally tended to fight one another, and one of them had to be either put in manual or detuned.
A dynamic simulator also allows you to try out novel or complex ideas in a safe environment. Split-range controllers, tracking and switched control can be difficult to understand. The simulator allows you implement the advanced ideas and see how they help (or hinder) production. Similarly, we have seen many studies where a gain-scheduled controller has reduced the number of trips in a process. The simulator improves understanding, increases confidence and makes for easier implementation.
WWW.THECONNECTSERIES.CO.UK Training the Next Generation
Operators in the North Sea are aging. There is a generation shift and a challenge in recruiting new operators and crew. The experience of operators who are retiring needs to be captured and transferred to the new generation of operators. These new operators grew up with Playstations and are receptive to computer-based training. A dynamic simulator, coupled to a copy of the control system and a virtual reality system is an ideal tool for capturing and transferring experience.
Rediscovering the Design Basis
Mature assets were often built in the days before digital information. This means that the design basis is paper based, bit-mapped or archived. Dynamic simulation can be an effective and useful way of digitizing and updating the design information of the facility. The dynamic simulator stores the key sizes and performance data for the process equipment in a way that is easy for operators and engineers to see and use. This revitalizes the design and data and makes it an on-line tool for operations. An operator
Dynamic simulation reduces risk and improves the quality of your modification process. Simulating the modification in a dynamic simulator before it is made allows you to check the effects of the modification on the performance of the rest of the facility. You can also check what the implications of the modification are for process control. Modifications in the control system can be fully tested before implementation offshore. Some leading operators require all modifications to be tested in this way. It is also good practice to implement all modifications in the platforms training simulator as they are made. This ensures that training is always correct and relevant.
Using Dynamic Simulation on operational and ageing assets to decrease downtime is proving invaluable for an increasing number of North Sea operators. Such is the success, that many companies now mandate simulation at all stages of the project life cycle, and start with design studies during FEED and Detailed design. The further use of the these Dynamic models for an OTS and Production Management Systems and on-going operational studies drives further value out of their investment, by increasing uptime, operator confidence, and most importantly: safety.
Oil&GasCONNECT 55
Tiebacks are used to revitalize and reuse installed facilities. Handling a new tieback is often a serious design and operations challenge. Dynamically simulating wells, tieback and reception facilities reduce risk at all stages of the development. HIPPS systems can be sized and verified. The control of the tieback can then be optimized. The interaction of the tieback with the topside and its control system can be validated and tested. Operators can be trained in operating the old facility with the new fluids. On-line dynamic models can be used to provide flow assurance advice and provide on-line information on handling the new production or meeting product constraints. The on-line dynamic model can also be used for leak detection and location. This helps you to have better control of the integrity of old pipeline infrastructure.
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