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Oil and Gas Sector E&P Reporting Protocol

This report presents the significant sources of greenhouse gas (GHG) emissions in the oil and gas sector for the Western Regional Air Partnership. It includes a procedure for determining these sources and provides screening-level inventories for each basin. The report also discusses limitations and uncertainties associated with the data.

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Oil and Gas Sector E&P Reporting Protocol

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  1. Oil and Gas Sector E&P Reporting Protocol For Western Regional Air Partnership May 4, 2009 Presented by: Science Applications International Corporation and Environ International Corporation

  2. Task 2: Significant Sources • Technical team tasked to develop a list of significant source categories by basin for the 6 member states/provinces in the WCI • Includes New Mexico, California, Utah, Montana, British Columbia and Manitoba • Significance was defined as those sources contributing to the top 95% of GHG emissions in a basin • Basins were defined using accepted USGS basin boundary definitions (consistent with past western states inventory efforts) • Screening-level inventories vs. reporting • Screening-level inventories developed at the basin level where possible, to attempt to account for regional variations in the significant sources • This is only for purposes of determining significant sources – reporting regulations are considering field/operational control as the reporting basis

  3. Task 2: Significant Sources • Procedure for determining significant source categories • Activity and equipment information obtained from a variety of sources including past inventory development efforts (e.g. WRAP, California districts) and survey data received from companies through API coordination • Data represents the aggregate of quantitative information on equipment, processes, activity, configurations from dozens of individual companies operating across the western U.S. • Aggregate data was used to develop screening-level inventories for each basin for which this data was available and presented as an estimate of the percentage contribution of source categories to total GHG emissions

  4. Task 2: Significant Sources • Limitations of the screening-level inventories • Activity and equipment information could not be obtained for all basins – for this reason screening-level inventories were created for generic production types using available data • Activity and equipment information could not be obtained for all source categories – where a source category was considered by the technical team to be potentially significant but for which no data was available, this was discussed • Data was aggregated from many sources, including data collected confidentially through various prior WRAP inventory efforts for this sector – this limited the nature of the data that could be presented in the Task 2 report

  5. Task 2: Significant Sources • List of Significant Combustion Sources by Region (w/percent contribution representing 95% of all GHG sources) 1 Note:The San Juan (South) Basin in northwestern New Mexico has a combination of tight sands gas, CBM gas and some oil production. 2 Note: The Uinta Basin in northeastern Utah has a combination of tight sands gas, CBM gas and conventional oil production.

  6. Task 2: Significant Sources • List of Significant Venting/Fugitive Sources by Region (w/percent contribution representing 95% of all GHG sources) 1 Note:The San Juan (South) Basin in northwestern New Mexico has a combination of tight sands gas, CBM gas and some oil production. 2 Note: The Uinta Basin in northeastern Utah has a combination of tight sands gas, CBM gas and conventional oil production.

  7. Task 2: Significant Sources • List of Significant Combustion Sources by Production Type (w/percent contribution representing 95% of all GHG sources)

  8. Task 2: Significant Sources • List of Significant Venting/Fugitive Sources by Production Type (w/percent contribution representing 95% of all GHG sources)

  9. Task 2: Significant Sources • List of Significant Combustion Sources by Production Type (w/percent contribution representing 95% of all GHG sources)

  10. Task 2: Significant Sources • List of Significant Venting/Fugitive Sources by Production Type (w/percent contribution representing 95% of all GHG sources)

  11. Task 2: Significant Sources • Comments received on significant source categories lists • List of significant sources useful in a qualitative manner (for inventory purposes), however since lists represent blended contributions they might skew data when assessing relevance to methodology development • Data uncertainties and variability across and within production basins obscure how methodology used could help identify sources that contribute less than 5% of the inventory • Examples from comments: • Offshore sources developed using 2 typical platforms (one for shore-based power and one for on-board power) – Many platforms converting to shore-based power • Relative ranking for CBM well blow-down seems very high • Relative rankings of modeling software for E&P tanks and process simulation needs to be revisited and confirmed • Fugitive emission contributions seem high from offshore platforms • For conventional oil, compressors seem to comprise too small a percentage • Footnote should be added to each table to discuss uncertainty associated with the rankings

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