Oil and Gas Sector E

1
Oil and Gas Sector EP 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)

San Juan (South Basin)1 Uinta Basin2
Permitted Compressor Engines (24.5) Heaters/Boilers (21.9)
Permitted Heaters/Boilers (13.9) Unpermitted Compressor Engines (6.3)
Unpermitted Compressor Engines (13.0) Permitted Compressor Engines (5.9)
Permitted NG Turbines (7.4) Artificial Lift Engines (5.6)
Unpermitted Heaters/Boilers (6.8) Drill Rigs (3.8)
Workover Rigs (1.6)  
Artificial Lift Engines (1.2)  
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.
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Task 2 Significant Sources

• List of Significant Venting/Fugitive Sources by
  Region (w/percent contribution representing 95
  of all GHG sources)

San Juan (South Basin)1 Uinta Basin2
Well Completion Venting (17.8) Pneumatic Devices (32.2)
Well Blowdowns (7.2) Pneumatic Pumps (15.6)
Flaring (1.2) Wellhead Fugitives (4.1)
Wellhead Fugitives (1.1)  
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.
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Task 2 Significant Sources

• List of Significant Combustion Sources by
  Production Type (w/percent contribution
  representing 95 of all GHG sources)

California Offshore Tight Sands Gas CBM Gas
Gas Turbines (57.7) Compressor Engines (33.0) Compressor Engines (46.0)
Supply Boats (2.2) Heaters/Boilers (17.5) Heaters/Boilers (25.4)
  Drill Rigs (3.9)  
  Workover Rigs (1.8)  
  Turbines (1.6)  
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Task 2 Significant Sources

• List of Significant Venting/Fugitive Sources by
  Production Type (w/percent contribution
  representing 95 of all GHG sources)

California Offshore Tight Sands Gas Production CBM Gas Production
Flaring (20.1) Pneumatic Devices (14.3) Well Blowdowns (15.3)
Fugitives (16.1) Fugitives (10.9) Fugitives (4.7)
  Flaring (7.6) Pneumatic Devices (3.5)
  Condensate Tanks (2.7) Flaring (2.6)
  Well Blowdowns (2.2)  
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Task 2 Significant Sources

• List of Significant Combustion Sources by
  Production Type (w/percent contribution
  representing 95 of all GHG sources)

Conventional Oil Production Conventional Gas Production
Heaters/Boilers (26.6) Compressor Engines (52.2)
Drill Rigs (6.0) Heater/Boilers (11.26)
  Drill Rigs (7.36)
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Task 2 Significant Sources

• List of Significant Venting/Fugitive Sources by
  Production Type (w/percent contribution
  representing 95 of all GHG sources)

Conventional Oil Production Conventional Gas Production
Artificial Lift Engines (18.9) Pneumatic Devices (11.5)
Pneumatic Devices (15.5) Fugitives (8.2)
Oil Tanks (12.0) Well Blowdowns (1.7)
Pneumatic Pumps (10.0) Dehydrators (1.7)
Fugitives (6.7)  
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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 EP
  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