Upload
vuongdat
View
214
Download
0
Embed Size (px)
Citation preview
1
Vermilion Energy Inc.
The Wandoo Story-
Marine and Subsea Life
Extension
Abigail Anderson – Operations Engineer
2
Vermilion Energy
♦ VOGA is an Canadian based Oil and Gas Company focused on mature oil and gas fields.
♦ Operations in Canada, France, Netherlands, Ireland and Australia.
♦ In Australia we are 100% owner of the Wandoo field located 75km offshore Karratha.
♦ We acquired the Wandoo field from Ampolex in 2007.
♦ Wandoo currently produces around 8,000bopd.
3
Presentation Overview
♦ Introduction to Wandoo
♦ The Life Extension Story – Subsea and Marine
♦ Replacement Studies
♦ LE Feasibility Review
♦ Operator Drivers
♦ Schedule
♦ Basis of Design
♦ Inspections & Data Gathering
♦ Analysis
♦ IMR Plans
♦ Operator Experience
♦ Summary
5
The Wandoo Story : WNA
Wandoo A
WNA installed in 1993 with
design life of 15 years.
Recertification was performed
for the structure in 2008 and
again in 2013.
WNA is an unmanned
monopod with 5 well heads.
6
The Wandoo Story: Construction
Wandoo B
The Wandoo Concrete
Gravity Structure (CGS)
was built by the Wandoo
Alliance in Bunbury, WA.
The CGS was towed to
the Wandoo Field, 75km
offshore Karratha, and
installed in 1996.
Design Life: 20 Years
12
Replacement Studies
♦ Wandoo A & B Studies completed in 2013 –
– Wandoo Assets Scoping Study
– SEA Flowline Replacement Study
– Export Offloading Configuration Screen Study
♦ Results from Flowline Replacement Study showed
that the cost of replacement (~$80M) was
uneconomical.
♦ Report recommended that a life extension feasibility
study was completed.
14
Operator Drivers
Vermilion Oil & Gas Australia (VOGA) intend to operate the Wandoo Oil Facilities for an extended period to end of field life, recent field development planning indicates that the platform is required for a further 20-years.
16
Life Extension Scopes
7 key systems were identified for life extension:
SSS1: WNB Superstructure SSS2: WNB Substructure SSS3: Subsea Systems (Flowlines) SSS4: Marine Systems (Export Systems) SSS5: Safety Systems SSS6: Wells SSS7: Process Systems
18
Basis of Design
♦ Establish the basis of original design
♦ Define the basis for life extension
♦ Analysis methodology
♦ Agreement on correct design codes, latest vs original
♦ Input requirements
♦ Software requirements
19
Inspections and Data Gathering
♦ ROV Campaigns
♦ Diving campaign
♦ Sonar
♦ Atmospheric survey - rope
♦ Internal inspections - CSE
♦ Intelligent Pigging
24
Subsea Life Extension
♦ Code and Standard Selection
♦ Flowline Reassessment Report
– On-bottom stability numerical analysis
– In-place tie-in assessment
– Flowline original design factor check
♦ Riser Analysis Report
– In-place Strength, Fatigue & Seismic numerical analysis
♦ PLEM Analysis Report
– Gap analysis
– In-place Strength, Fatigue, Foundation Capacity & Seismic numerical analysis
♦ Modelling – Orcaflex
26
CALM Buoy Life Extension
♦ Codes and Standard Review
♦ Current condition review – inspection report review
♦ Mooring Analysis
♦ Mooring Line Assessment
♦ Structural Analysis
♦ Buoy Flooding Analysis
♦ Submarine Hose Assembly Analysis
♦ Anchor Assessment
♦ Software- Orcaflex,
MOSES, FEMAP
29
Operator Experience
♦ Lessons Learnt-
– Early involvement of the Independent Verifying Body is
essential to ensure aligned life extension process
– Contractor selections is critical
– As-built historical documents can be difficult to locate
– Sheer amount of documentation required
– Dedicated personnel to project controls required
– Track ever changing schedules!
30
Summary
♦ Vermilion is on it’s way to achieving life extension of the
Wandoo assets
♦ Life extension doesn’t happen overnight – schedules,
resources and budgets need to be considered prior to
undertaking
31
Life Extension Team
Thanks to the Vermilion Life Extension Team
And some of the Life Extension Contractors: