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Managing Well Integrity During
Transfer of Field Ownership
–A Case Study
Rob Kuyper Mike Richardson
TAQA Bratani Senergy
What is Well Integrity?The ability of the well to contain fluids from the well construction phase through production and intervention to suspension and abandonment
•Drilling integrity
•Production Integrity
•Suspension Integrity
•Abandonment Integrity
Introduction
TAQA acquired mature North Sea assets
• Acquisition from Shell/Esso completed 1st December 2008
• 4 Platforms (Cormorant Alpha, North Cormorant, Tern, Eider)
• 3 Subsea well clusters (Pelican, Kestrel, UMC)
• 100% equity in fields, >100 wells
In 2008, TAQA was not ready to become Well
Operator
• Intermediate Well Operatorship by Senergy
• Transfer of Well Integrity responsibility
• 2008: Shell => Senergy
• 2009: Senergy => TAQA
The Case
To develop TAQA into a fully functional Well Operator as quickly as
possible while maintaining safety, integrity and production.
The Objective
… and their oil production history at acquisition
Cormorant Alpha
Eider
North Cormorant
Tern
-
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
1979
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
2005
2007
Oil p
rod
ucti
on
(b
/d) South Cormorant
Pelican
-
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
1979
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
2005
2007
Oil p
rod
ucti
on
(b
/d)
North Cormorant field
-
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,00019
79
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
2005
2007
Oil p
rod
ucti
on
(b
/d)
Tern
Kestrel
-
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
1979
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
2005
2007
Oil p
rod
ucti
on
(b
/d)
Eider
Otter
WELL TRANSFER ROAD MAP
• Establish Wells Team
• Transfer data
• Create policies & procedures for well management
• Well integrity management system working
• Assessment of readiness
• Transfer of asset ownership / well operator / duty
holder
• Monitor & enhance
PREPARATION FOR HANDOVER
• Wells Team in place early
•Resourced through Senergy
• Data Transfer
•Sale not complete
•Confidentiality –transfer to Senergy
•Early start to check completeness
•Meetings with technical teams
• Policies & procedures
•Purchase established system
•Minimise change, evaluate, amend later
•Installation specific retained from previous owner
•Additional material generated as required
PREPARATION FOR HANDOVER
• Contracting Strategy
•Outsource through transition phase
•Services ranked according to criticality for well integrity
•Accelerate by use of existing service contracts
•Migrate to direct contracts afterwards
WELL OPERATOR TIMELINE
Evaluation of
assets for sale
Agreement
to purchase
Preparation of
wells organisation
Transfer of
Well Operator
to Senergy
Transfer of Well
Operator & Duty
Holder to TAQA
Today:
Mature TAQA
well integrity
team in place
2007 2008 2009 2010 2011
Shell Senergy TAQA
WELL OPERATOR TIMELINE
Evaluation of
assets for sale
Agreement
to purchase
Preparation of
wells organisation
Transfer of
Well Operator
to Senergy
Transfer of Well
Operator & Duty
Holder to TAQA
Today:
Mature TAQA
well integrity
team in place
2007 2008 2009 2010 2011
Shell Senergy TAQA
ASSESSMENT OF READINESS
• Shell retained responsibility until 1st Dec 2008
• Shell ensured they were handing the assets over
to a competent organisation
• TAQA, Wood Group & Senergy also needed this
assurance
ASSESSMENT OF READINESS
• Audits
Wood Group audit Senergy as Well Operator
Senergy audit Wood Group as Duty Holder
• Management Review
Shell, TAQA, Wood Group, Senergy
3 day Shell assessment of readiness
• Roles & responsibilities
•3rd party facilitation of organisation iterfaces
•Topsides / wells / pipelines
•Clearly defined limits & responsibilities
ASSET HANDOVERS
Date From To Comments
License Holder
Dec 08 Shell TAQA Smooth transition
Well Operator
Dec 08 Shell Senergy Smooth transition
Duty Holder Dec 08 Shell Wood Group Smooth transition
Well Operator
Sept 09 Senergy TAQA Smooth transition
Duty Holder Sept 09 Wood Group TAQA Smooth transition
TOOLS & SYSTEMS USED
•WIST - Well Integrity Status Tool•Bespoke database –live Q1 2009
•Temporary spreadsheets used while WIST tested
•Well Examination•Direct contract established
•Increased emphasis on existing wells versus “new
wells”
•Interface with platform ICP verification process
•Testing routines•Base routines maintained from Shell
•Transferred from SAP to Maximo
•Direct (annulus) pressure monitoring to WIST via PI
TOOLS & SYSTEMS USED
• Well integrity visibility & management•Clear Roles & Responsibilities (Cairntoul)
•Meetings & reports•Daily monitoring and reports
•Weekly well integrity meetings
•Monthly management well integrity meetings
•WIST available to onshore & offshore personnel
•Valve failure register published on intranet
•SUCIT•Ultrasonic casing integrity tool developed
•Well services stock control system•To minimise time between failure and fix
•Well Management Procedures•Senergy, Shell & new
MODIFICATIONS
•Fine tuning of procedures
•New wellbore surveying manual
•Well services stock control system
•Repair grace period review
•Recalculated all casing pressure triggers &
limits
•Platform specific intervention procedures
•Well integrity management KPIs
•Improved pressure information for well
planning
KEY LEARNING
• Prioritise purchase of critical well spares
to avoid long lead time
• Education campaign to promote
policies & procedures to the new team
• Early access to data and good file structures
from start
• Cooperation & trust between buyer and seller
are important. Trust but verify.
• Use of management company allows project
acceleration