status report for ieaghg, april 2011

Mike Carpenter28 April 2011

CO2WELLS JIP & Guideline

Status report for IEAGHG, April 2011

© Det Norske Veritas AS. All rights reserved.


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CO2WELLS Guideline

Guidelines and industry standards speed up deployment of new technology



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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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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



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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



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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



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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



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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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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



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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



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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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Safeguarding life, property and the environment

www.dnv.com

status report for ieaghg, april 2011

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