Training course
Subsea Xmas Trees
Subsea trees from drilling and wellheads to tree types, interfaces, installation tooling, completions and intervention, and the commercial and technical factors that drive tree selection.
- Duration
- 3 days
- Outline
- 13 modules
- On completion
- Certificate from Z-Subsea Energies / Valve Institute
About the course
This comprehensive course gives an overview of subsea Xmas trees through lectures, photo and video presentations, case studies and workshops. It explains the fundamental issues behind the robust, safe and economical selection of subsea trees and their valve and actuator systems, from concept to detailed design.
The principal codes include ASME VIII Divisions 1 and 2, ISO 10423 (API 6A) for wellheads and Xmas trees, ISO 13628-4 (API 17D) for subsea wellheads and ISO 15156 (NACE MR0175), together with the recommended practices DNV-RP-F112, on duplex stainless steel under cathodic protection, and DNV-RP-B401, on cathodic protection design.
What you will learn
The steps in engineering and designing subsea Xmas trees, from initial selection to pre-commissioning
The key topics in engineering subsea Xmas trees
The physical concepts behind Xmas tree design philosophy
The criteria for robust and safe design of Xmas trees
Who should attend
- Engineering graduates
- Pipeline engineers
- Commissioning and pre-commissioning engineers
- Subsea and offshore engineers
- Inspection and maintenance engineers
- Project engineers and managers
- Engineers from other parts of the oil and gas industry who want to understand subsea pipeline engineering
Course outline
01 Introduction 4 topics
- Subsea tree criticality
- Global subsea trends and challenges
- Overview of all project phases
- Potential tree failure modes
02 Subsea drilling 6 topics
- The subsea well programme
- Drilling a well
- Running the conductor
- Cementing processes
- Running the blowout preventer
- Cleaning and abandonment
03 Wellhead systems 4 topics
- Wellhead types
- Wellhead stack-up overview
- Wellhead components: housing, conductor, casing and pack-off
- Metal-to-metal sealing
04 Subsea tree functionality 6 topics
- Monobore (MBT) vertical trees
- Concentric (CBT) and non-concentric trees
- Dual-bore (DBT) vertical trees
- Side-valve (SVT) horizontal trees
- Crossover (CTS) vertical and horizontal trees
- Drill-through systems
05 Tree interfaces 4 topics
- Tubing hangers
- Tubing hanger lockdown systems
- Wellhead connectors
- Connector load capacities
06 Installation tooling 8 topics
- Running and retrieving operations
- Horizontal versus vertical tooling
- Surface tree
- Cased wear joint, tension joint, riser joint and stress joint
- EDP, LRP and tree cap
- Swivel joint and lubricator valve
- Casing and tubing riser
- Universal running tool
07 Completion types 4 topics
- Basic principles of completion
- Monobore systems
- Open-water systems
- Test and handling equipment
08 Intervention and workover systems 9 topics
- Completion workover riser systems
- Workover control systems
- Light, medium and heavy interventions
- Landing string versus open-water riser
- Xmas tree changeout
- Scale milling
- Completion changeout
- Re-drilling and sidetracking
- Commercial considerations
09 Technical considerations 4 topics
- Riserless lightweight intervention systems
- Reservoir stimulation
- MARS concept
- Dual-bore risers
10 Commercial considerations 1 topic
- Rental versus procurement
11 Factors influencing the final choice 12 topics
- Method of installing and completing the wells
- Installation onto existing wells
- Complexity of the lower and upper completion strings
- Size of production tubing
- Need to flow-test or clean up the well through the riser
- Xmas tree functionality
- Need for early production
- Planned wireline and tubing workovers over the life of the field
- Likelihood of further field expansion
- MODU criteria
- Tooling systems
- Operator experience
12 Design and testing 6 topics
- PR2 testing
- Performance requirements
- Terms and definitions (MWP, MOP, MDP)
- Material requirements for body, bonnet and other parts
- End connections and actuator materials
- Stress calculations to ASME VIII Division 2
13 Future developments 1 topic
- All-electric and hybrid trees
Codes and standards covered
- ASME VIII Div. 1 & 2
- ISO 10423 (API 6A)
- ISO 13628-4 (API 17D)
- ISO 15156 (NACE MR0175)
- DNV-RP-F112
- DNV-RP-B401
Free download
Subsea Xmas Trees brochure
Course description and full outline of the three-day Subsea Xmas Trees course.
Enquire
Bring this course to your team.
Tell us how many people you’d like to train and how you’d like the course delivered. We’ll confirm the syllabus, format and dates with you.
- Run in-house for your team, anywhere in the world
- Syllabus tailored to your project requirements on request
- Certificate from Z-Subsea Energies / Valve Institute on completion
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Need this course tailored to your project?
We can adapt the syllabus to your assets, your design codes and your team’s experience.