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Preferred partner
Pushing the Envelope of Completion/ Workover Riser Technology
MCE Deepwater Development 2014
Øystein Wærstad | Specialist Engineer | Workover Systems
Public © 2014 Aker Solutions Preferred partner
This is Aker Solutions
■ Provides oilfield products, systems and
services for customers in the oil and gas
industry
■ Built on more than 170 years of industrial
tradition
■ Employs approximately 26 000 people in
about 30 countries
MCE Deepwater Development 2014
Employees: 26 000
Revenues: 42.9 bn
EBITDA: 3.5 bn
Market Cap: 28.2 bn
Revenues and profits are in NOK and are based
on the preliminary annual results for 2013.
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Workover & Completion Riser Systems
MCE Deepwater Development 2014
Public © 2014 Aker Solutions Preferred partner
Today’s Technology … Tomorrow’s Challenges
MCE Deepwater Development 2014
High Fatigue
Ultra Deep Water Sour Service
Arctic Environments
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Challenge I: Ultra Deep Water
■ Running time ■ Decreased running time =
Decreased cost
■ Weight ■ Welding limits selection of high
strength steel
■ Increased yield strength in riser
Decrease weight requirement
■ Make and break ■ Multiple make and break will
facilitate ease of well jumping
■ Monitoring ■ Fatigue and utilization are based
upon theoretical analysis/estimate
■ Increased monitoring will reduce
conservatism
■ Wear and tear ■ Use of “slips” will induce damage
to riser pipe
MCE Deepwater Development 2014
Public © 2014 Aker Solutions Preferred partner
Challenge II: Sour Service
■ Material resistance ■ Limits selection of material if welds are present (typically >75-80KSI yield) for a
robust serial production
■ Forging material have limitations >80-85KSI yield for a robust serial production
MCE Deepwater Development 2014
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Challenge III: High Fatigue
■ Stress Concentration Factor (SCF) ■ Ultra deep water gives highly
loaded risers, and an optimized
load distribution will define the
fatigue capacity
■ Predictable SCF during the
lifetime is a key design feature for
increased lifetime
■ Weld ■ Difficult to quantify internal weld
root quality and corresponding
actual SCF
■ Complicated NDT (reliability)
■ Challenging recertification
■ Monitoring ■ Real time monitoring in
collaboration with predictable SCF
will increase operational safety
■ Essential for control of remaining
fatigue life
MCE Deepwater Development 2014
Public © 2014 Aker Solutions Preferred partner
Challenge IV: Arctic Environments
■ Handling ■ Automated make and break will
reduce human presence at drill
floor in harsh environments
■ HSE aspect covered by
automation
■ Material properties ■ Fracture toughness is dependent
on temperature
■ Operation of risers will be
dependent on use of material with
greater toughness (charpy values)
and yield properties
MCE Deepwater Development 2014
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Tomorrow’s Technology … Tomorrow’s Solutions
MCE Deepwater Development 2014
High Fatigue
Ultra Deep Water Sour Service
Arctic Environments
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Upset Technology
MCE Deepwater Development 2014
©Tenaris 2012
©Tenaris 2012
■ Upsetting of pipe is a robust and
repetitive steel making process
that enables the use of higher
strength material
■ No heat affected zones which
reduces ductility, sour service
performance, fatigue life and
material imperfections
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Optimised Grooves
MCE Deepwater Development 2014
Threads
Optimised load
grooves
Design principles:
■ Connector designed to be
stronger than pipe
■ Preloaded within normal
operation
■ Force distribution optimized
■ Designed for low SCF
(no small radiuses or sharp
corners in load path)
■ Improved Sour Service
performance
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Hang-Off in Spider
MCE Deepwater Development 2014
Slips
Spider
■ Slips are simple and quick to use.
They are based on friction and
contribute to riser damage and
higher dynamic loadings to the
riser
■ These effects increase with water
depth as the riser system
becomes heavier
■ Spider based hang off uses
dedicated load bearing surfaces
and eliminates riser damage
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Remotely Operated Connector Make Up Tool
MCE Deepwater Development 2014
■ Historically most work on drill
floor was manual
■ Today new build rigs are equipped
with remotely operated equipment
for all pipe and riser handling
operations
■ Utilising these tools significantly
improves HSE and accelerates run
time in deepwater
■ This is also achievable for
workover risers
Public © 2014 Aker Solutions Preferred partner
Contact Aker
Solutions to learn more!
The hunt for the perfect riser …
Co-Authors:
Geir Ivar Holberg
Craig Harvey
Øystein Wærstad | Specialist Engineer
MCE Deepwater Development 2014
Public © 2014 Aker Solutions Preferred partner
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MCE Deepwater Development 2014