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Title: Comparing facility-level methane emission rate estimates at natural gas gathering and boosting stations

Coordinated dual-tracer, aircraft-based, and direct component-level measurements were made at midstream natural gas gathering and boosting stations in the Fayetteville shale (Arkansas, USA). On-site component-level measurements were combined with engineering estimates to generate comprehensive facility-level methane emission rate estimates ('study on-site estimates (SOE)') comparable to tracer and aircraft measurements. Combustion slip (unburned fuel entrained in compressor engine exhaust), which was calculated based on 111 recent measurements of representative compressor engines, accounts for an estimated 75% of cumulative SOEs at gathering stations included in comparisons. Measured methane emissions from regenerator vents on glycol dehydrator units were substantially larger than predicted by modelling software; the contribution of dehydrator regenerator vents to the cumulative SOE would increase from 1% to 10% if based on direct measurements. Concurrent measurements at 14 normally-operating facilities show relative agreement between tracer and SOE, but indicate that tracer measurements estimate lower emissions (regression of tracer to SOE = 0.91 (95% CI = 0.83-0.99), R2 = 0.89). Tracer and SOE 95% confidence intervals overlap at 11/14 facilities. Contemporaneous measurements at six facilities suggest that aircraft measurements estimate higher emissions than SOE. Aircraft and study on-site estimate 95% confidence intervals overlap at 3/6 facilities. The average facility level emission ratemore » (FLER) estimated by tracer measurements in this study is 17-73% higher than a prior national study by Marchese et al.« less
 [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4] ;  [1]
  1. Colorado State Univ., Fort Collins, CO (United States)
  2. Aerodyne Research Inc., Billerica, MA (United States)
  3. Univ. of California, Davis, CA (United States); Scientific Aviation, Inc., Boulder, CO (United States)
  4. Univ. of Colorado, Boulder, CO (United States); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
  5. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2325-1026
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Elementa Science of the Anthropocene
Additional Journal Information:
Journal Volume: 5; Journal Issue: 0; Journal ID: ISSN 2325-1026
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
03 NATURAL GAS; 54 ENVIRONMENTAL SCIENCES; methane emissions; gathering; boosting; natural gas; climate change; Fayetteville
OSTI Identifier: