1. “Finishing” Task 2 – Discussion of the Way(s) Forward
May 5, 2009
O&G GHG Technical WorkGroup

2. 100 PM (amended agenda) – 5/5/09 session

3. Issues identified in Task 2 draft report – comments & discussions at May 4-5 meeting
Comment “Type”
In current Task 2 Scope
Ranking of significant sources by basin/production type not comparable & consistent:
most to least significant & across the WCI region
beyond top few, what is the meaning/interpretation of the lesser ranked sources?
Uniformity of production across basins
Results were limited by data availability, will add on-shore CA rankings and better specify rankings and input activity source data for each WCI partner jurisdiction
Rankings are a consequence of data availability and method used, will add “score” for certainty/reliability of each source emissions estimate
Lack of methodological comparative analysis
This shortcoming is a reasonable conclusion, based on Task 2 SoW, but was not identified as a work product in Task 2 outline to TWG
Discussions at meeting allow additional methods to be added to Chapter 3
Recommended methods for upstream O&G sources
Some methods discussed in detail at Denver meeting, others not – recommendations for rankings of methods requires objective criteria

4. Issues identified in Task 2 draft report, cont
Issues identified in Task 2 draft report, cont. - comments & discussions at May 4-5 meeting
Comment “Type”
In current Task 2 Scope
General need:
properly qualify the use & limitation of the rankings
master table across all basins/production types
Improve consistency of terminology, source definition, et cetera across Tasks 1 and 2
better specify technical intent and limitations of Task 2 report
Will address, including review of API glossary
Mobile sources not addressed
Better addressed by other means?
Contractor emissions not addressed
Some information provided, not translated to basin/production type rankings (see next slide)

5. Contracted Activities
Construction (liquid fuel) – well pads, drilling, pits, installing equipment, building and foundations
Well operators (CO2, CH4)– drilling*, completion*, stimulation, work-over and recompletion*
Combustion – not typically counted by direct operators
Vented – typically counted by direct operators, even if contractor activity
* Drilling, completions and recompletions account for 1.5 5.5%, approximately, significant
Contractor vehicles (numerically large) (Liquid fuel ) - Miscellaneous non-road equipment, backhoes, water trucks, etc.

6. Possible Criteria to Evaluate Methods
Accurate (can be verified)
Bias
Contractor-supplied?
Cost
Feasibility (i.e. technical and practical)
Method/measurement device availability
Precision
Reliability