status report for ieaghg, april 2011
TRANSCRIPT
Mike Carpenter28 April 2011
CO2WELLS JIP & Guideline
Status report for IEAGHG, April 2011
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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CO2WELLS Guideline
Guidelines and industry standards speed up deployment of new technology
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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Risk assessment context
NORSOK D010
ISO 31000 Risk Management
DNV RP A203 for Qualification of New Technology
CO2QUALSTORE
CO2WELLS Part A
CO2WELLS Part B
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CO2WELLS JIP & Guideline
28 April 2011
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Scope of guideline
Establish status of existing wells.
Provide input to site selection
Select engineering concept for wells
Verify that planned solution will work prior to FID
Detailed design of:
new wells
conversion of old wells
P&A of old wells
re-P&A of old wells
Drilling and/or workovers
Well operation & monitoring
Plug & abandon according to design
CO2WELLS scope
- Exploration Permit
- Storage Permit
- Transfer of Responsibility
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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Well QualificationStatus of the Well:
• Current service life
• Technical condition
• Main capabilities
• Conformity to current regulations/exemptions
• Relevant incidents
Future functionality required of the well
Degradation mechanisms
Quality of construction
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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Norwegian study
Seabed @ 75 m MSL, 115 m RKB
30” cut 5 m below seabed20” recovered from 10 m below seabed13 3/8” cut 9 m below seabed9 5/8” cut 155 m below seabedBottom of cement plug @ 360 m RKB, 245 m below seabed
30”@ 187 m RKB
13 3/8”@ 1225 m RKB
13 3/8” TOC @ seabed
9 5/8” TOC @ 1080 m RKB
Utsira 947 -1018 m
Abandonment cement plug 2055 – 2237 m RKB
9 5/8” @ 2137 m RKB
1
2 b,c
2a
3
4a
4bTop of cement plug 45 m below seabed
2 offshore P&A wells
potential CO2 storage site
Neither well found to be suitable for exposure to CO2 in present state
Two independent barriers inside the storage complex are required
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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Alberta sour gas operatorsRisk based vs. presciptive approaches
Must have good data on existing wells before you can re-use
Re-Abandonment are generally as a result of poor design and/or execution
Zonal isolation design and execution is critical
Abandonment plans are built into designs
In dry CO2 conventional materials used
Low temperatures can be seen
Minimise elastomer use and use correct ones
Fit downhole valves but think through testing
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
9
Alberta regulatorsLarge database of wells with very few problems on sour/CO2 wells to date
Identify “sphere of influence” at start
Follow legislation however the encourage risk analysis to be performed on design
Much attention paid to zonal isolation and monitoring plans
New legislation being prepared but unlikely to relax the sour gas standard and looking at low temperatures
Have taken and continue to take bold legislative steps to make CCS happen
Accepts that early project experiences might have problems but the key is to get on to the learning curve soonest
Not so concerned about the “conduit” part of the well – focus is on zonal and field isolation and how barrier analysis has been performed
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CO2WELLS JIP & Guideline
28 April 2011
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Conclusions from Alberta study
CO2WELLS approach appears to be in alignment with what is being done
More emphasis on monitoring
Ensure risk ranking is used to build effective measures over the life-cycle of the well
Strengthen some of the processes in the guideline
Quality conventional cementing operations on CO2/sour wells appear to give agreeable results
More emphasis on monitoring required in the guidelines
Modelling required to identify all wells/areas which could see CO2 before FID
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
11
Looking aheadMay: draft guideline available for review and comment
June: guideline will be published on DNV and GCCSI websites
September: draft RP for CO2 storage based on:- CO2WELLS guideline- CO2QUALSTORE guideline
© Det Norske Veritas AS. All rights reserved.
CO2WELLS JIP & Guideline
28 April 2011
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CO2 storage: CO2QUALSTORE + CO2WELLSProvides project developers with
A transparent basis for decision-making to meet internal milestones and decision gates
Guide to set performance targets that will enable the granting of relevant permits for individual sites
Predictable operating conditions
Provides regulators/authorities with:Standardized guide to verify that sites have been selected and assessed as suitable for geological storage of CO2
Basis for development/implementation of national regulations aligned with industry best practice, directives and other national regulations
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CO2WELLS JIP & Guideline
28 April 2011
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Safeguarding life, property and the environment
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