Selecting the right subsea tree system is a critical step in planning every field development.
here are many decisions that significantly affect budgets, installation and operations, for example:
- Unnecessary CAPEX can easily be millions of dollars
- Excessive OPEX costs both early and late in field life
- Operational considerations during the production phase
Using the experience of delivering and installing hundreds of subsea trees operating in a wide variety of conditions around the world, engineers at OneSubsea have developed the Tree Selector Tool. Disciplines of engineering, operations, manufacturing and service contributed to this tool.
The Tree Selector Tool asks a series of questions covering economics, performance characteristics, and anticipated risks. The goal is to provide the team with subsea tree performance requirements early in the phase of system development. The tool is based on a six sigma methodology focused on ‘the 3 C’s’:
- Cost reduction
- Cycle time improvement
- Customer satisfaction
“This selector tool identifies approximately 50 independent function and performance requirements for a subsea tree and ranks the interrelationships of the requirements to the various subsea tree systems, such as conventional, vertical monobore and horizontal systems,” said Chris Kocurek, subsea tree product manager. “A user then is able to adjust the importance of the functional and performance requirements, dynamically adjusting the final selection of the advised tree system.”
“In a system where new tree-based technology is being implemented, the customer could place a higher focus on retrieval of a tree over the completion,” Kocurek said. “If new, novel downhole completion technology is being implemented, a higher importance may be placed on the ability to pull and rerun the completion.”
It also allows for the population of risk matrix and mitigation strategies to eliminate risk earlier in the project. The Tree Selector Tool has four categories:
- Health, Safety and Environmental (HSE)
- Performance feature
- Technical factors
The OneSubsea Early Engineering Engagement (EEE) group of industry experts make use of the Tree Selector Tool to help customers select a system early in the development, providing the additional benefit of reducing Front-End Engineering and Design (FEED) time and costs.
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