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DRAFT Inventory of U.S Greenhouse Gas Emissions and Sinks

2017_complete_report

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1 2 3 4 5 6 7 8 9 10 2011 through 2015. For years 2011 through 2015, GHGRP year-specific data on fractions of pneumatic controllers in each category (high bleed “HB”, low bleed “LB”, and intermittent “IB”) were applied to the counts of pneumatic controllers. The 1990 through 1992 per well counts of controllers in each category and pumps were retained for 1990 through 1992 and then the per well counts of pneumatic controllers in each category for 1993 through 2010 were developed by linearly interpolating from 1992 through 2011. Category-specific emissions factors developed for the previous Inventory from year 2014 GHGRP data were applied throughout the time series. The recalculations resulted in large decreases in total national counts, but only minor changes in the annual fractions of controllers in each category. Table 3-43: Pneumatic Controller and Chemical Injection Pump National Equipment Counts and National Emissions (Metric Tons CH4) Activity Data/Emissions 1990 2005 2011 2012 2013 2014 2015 Pneumatic Controllers High Bleed (Counts) 163,860 95,653 55,418 38,649 22,991 19,921 20,143 Low Bleed (Counts) 304,312 273,073 256,148 286,470 182,646 176,810 159,783 Intermittent Bleed (Counts) - 155,315 249,378 260,377 397,042 424,126 428,652 Previous High Bleed (Counts) 163,225 160,475 103,061 76,469 50,241 43,211 NA Previous Low Bleed (Counts) 303,132 460,289 495,938 494,211 337,406 300,940 NA Previous Intermittent Bleed Counts - 284,053 533,112 599,859 806,207 868,079 NA Total Emissions (MT) 765,061 700,296 666,087 614,545 739,177 766,390 771,571 Previous Estimated Emissions (MT) 762,095 1,211,263 1,348,290 1,334,230 1,511,099 1,569,471 NA Percent Change in Emissions 0% -42% -51% -54% -51% -51% N/A Chemical Injection Pumps (Counts) New Pumps (Counts) 32,379 44,317 50,839 53,065 54,622 56,270 55,157 Previous Pumps (Counts) 32,236 89,796 119,058 123,100 125,552 127,484 NA Total Emissions (MT) 49,064 67,155 77,039 80,411 82,771 85,267 83,581 Previous Estimated Emissions (MT) 48,849 136,071 180,413 186,537 190,253 193,181 NA Percent Change in Emissions 0% -51% -57% -57% -56% -56% NA NA – Not Applicable 11 12 13 14 15 16 17 18 19 20 Associated Gas Venting and Flaring EPA developed a new estimate for associated gas venting and flaring, replacing its previous estimates for stripper well venting. For more information, please see pages 14 through 19 of the 2017 Production Memo. For the public review draft, EPA developed a total percentage of oil wells that vent and flare from 2015 GHGRP data (12 percent), and applied that value to total national oil well counts for full time series. EPA then applied the GHGRP yearspecific split of that 12 percent between venting wells and flaring wells for years 2011 to 2015, and applied the 2011 split to each year from 1990 to 2011. Emission factors developed from year 2015 GHGRP data were applied for the full time series. EPA then removed the “stripper well” line item that had been included in previous inventories as those emissions are included in the updated estimates for associated gas venting and flaring. Table 3-44: Associated Gas Well Venting and Flaring National Emissions (Metric Tons CH4) Source 1990 2005 2011 2012 2013 2014 2015 Associated Gas Well Venting Emissions (MT) 628,907 526,013 591,810 497,114 221,004 91,949 44,015 Associated Gas Well Flaring Emissions (MT) 78,697 65,822 74,055 107,608 150,612 154,077 109,221 3-68 DRAFT Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2015

Previous Estimated Emissions from Stripper Wells (MT) 16,353 14,491 14,651 14,799 14,799 14,799 NA NA – Not Applicable 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Transportation Recalculations due to updated activity data for quantity of petroleum transported by barge or tanker in the transportation segment have resulted in an average increase in calculated emissions over the time series from this segment of less than 0.01 percent. Refining Recalculations due to updated data, including resubmitted GHGRP data, in the refining segment have resulted in an average increase in calculated emissions over the time series from this segment of less than 0.01 percent. Planned Improvements Plans for Final 2017 GHG Inventory EPA continues to receive and review stakeholder feedback on the 2017 Production Memo. EPA will consider this feedback, along with feedback on this public review draft as it develops the final Inventory. EPA seeks feedback on the methods applied in this public review draft, on other options presented in the 2017 Production Memo, and on additional planned improvements under consideration discussed in this section. Uncertainty The most recent uncertainty analysis for the petroleum systems emission estimates in the Inventory was conducted for the 1990 to 2009 Inventory that was released in 2011. Since the analysis was last conducted, several of the methods used in the Inventory have changed, and industry practices and equipment have evolved. In addition, new studies and other data sources such as those discussed in the sections below offer improvement to understanding and quantifying the uncertainty of some emission source estimates. EPA is planning for the final Inventory an update to the uncertainty analysis conducted for the Inventory published in 2011 to reflect the new information. It is difficult to project whether updated uncertainty bounds around CH 4 emission estimates would be wider, tighter, or about the same as the current uncertainty bounds that were developed for the Inventory published in 2011 (i.e., minus 24 percent and plus 149 percent). Gas STAR Reductions in Petroleum Systems Production Segment The Inventory estimate for Petroleum Systems takes into account reductions reported to the Natural Gas STAR program. 78 Reductions included in the Petroleum Systems calculations are those reported to Natural Gas STAR for the following activities: artificial lift - gas lift; artificial lift - use compression; artificial lift - use pumping unit; consolidate crude oil production and water storage tanks; lower heater-treater temperature; re-inject gas for enhanced oil recovery; re-inject gas into crude; and route casinghead gas to vapor recovery unit or compressor. EPA is considering removing the Gas STAR reductions from its calculations for the Petroleum Systems Production segment. In this public review draft of the Inventory, Gas STAR petroleum systems reductions reduce calculated potential emissions by an average of 1 percent over the times series. Many emissions sources in the Inventory are now calculated using net emissions approaches, with technology-specific activity data and emission factors, and annual data from the GHGRP. It may not be necessary to adjust for the reductions and may result in double-counting of reductions, and removing the reductions may improve transparency of the results and methods. However, EPA 78 See . Energy 3-69

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    a Emissions from Wood Biomass and E

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    CH4 0.3 0.1 0.1 0.1 0.1 0.2 0.2 Pet

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    1 2 3 4 Overall, in 2015, waste act

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    Cement Production 33.3 45.9 32.0 35

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    Total 1,862.5 2,441.6 2,197.3 2,059

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    Total Emissions 6,366.7 7,315.6 6,7

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    N2O 1.0 1.2 1.1 1.0 1.1 1.1 1.1 Oth

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    U.S. Territories a 28.0 50.1 41.7 4

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    New Mexico 70,608 52,250 12.0 0.263

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    C Storage Factor, Proportion of Ini

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Quality manual for the greenhouse gas inventory. Version 1.
D - Inventory of Greenhouse Gas Emissions - Abengoa
Use of Models and Facility-Level Data in Greenhouse Gas Inventories
Greenhouse Gas Emissions Inventory for Chapel Hill Street Lights ...
international maritime transport and greenhouse gas emissions - IMO
Greenhouse Gas Emissions from U.S. Heavy-Duty Trucks
Greenhouse Gas Emissions from U.S. Transportation - Center for ...
Building trust in greenhouse gas inventories from the United ... - WWF
Greenhouse Gas Emission Policies Is There a Way ... - Castalia
Evaluation of Greenhouse Gas Emissions from Septic ... - Geoflow
Greenhouse gas emissions from production of imported and ... - Inra
2009 Corporate Greenhouse Gas Emissions Inventory - the Town of ...
Annual European Community greenhouse gas inventory 1990-2003
City of Richmond 2008 Greenhouse Gas Emissions Inventory
Expert Meeting on Uncertainty and Validation of Emission Inventories
Greenhouse Gas Emissions from U.S. Agriculture and Forestry: A ...
Projection of Greenhouse Gas Emissions 2010 to 2030
Greenhouse Gas Emissions Inventory Report - Cal Poly Pomona
Greenhouse Gas Emissions Outlooks and Scenarios, Dolf ... - IPIECA
Amendments to UK greenhouse gas emissions trading ... - Gov.UK
Reducing US Greenhouse Gas Emissions - Center for Climate and ...
Annual Danish Informative Inventory Report to UNECE. Emission ...
Danish emission inventories for road transport and other mobile ...
Aspen-Pitkin County Airport Greenhouse Gas Emissions Inventory ...
Reducing U.S. Greenhouse Gas Emissions - Center for Climate and ...
Typico plc Greenhouse Gas Emissions Report – 2009 - PwC
Predicting Greenhouse Gas Emissions From Flares - SCS Global ...