These electronic data are described in the supporting information.

Measurements of Methane Emissions at Natural Gas Well Sites

David T. Allen, Vincent M. Torres, James Thomas, David W. Sullivan, Jarett Spinhirne
Center for Energy and Environmental Resources, University of Texas at Austin

Matthew Harrison, Al Hendler, Meggen Delollis, Bryan Benaway, Gene Youngerman, Randy Stevens,
Megan Bowien, Kevin McGinn
URS Corporation

Scott C. Herndon, Jon P. Franklin, Cody Floerchinger, Joanne Shorter, Cameron Martin, Ryan McGovern and Joda Wormhoudt
Aerodyne Research, Inc.

Below is the list of sites visited during the course of this study.  Download all the data sets on this page in one Zip file.

For the measurements done at production sites, three files are available:

1. Sites Dataset: Contains the summary information for the total 150 sites where measurements took place. The file shows counts of measurements by type of equipment, as well as the total counts of equipment present at each site; as reported by the sponsor companies. Gas composition (O2= oxygen, HE= helium, N2= nitrogen, CO2= carbon dioxide, C1= methane, C2= ethane, C3= propane, IC4= isobutene, NC4= n-butane, IC5= isopentane, NC5= n-pentane, NEOC5= neopentane, C6+= 6 carbons or more) and production information is also available for each site. The "Site Name" provides the region where the site is located (AP= Appalachian, GC= Gulf Coast, MC= Midcontinent, and RM= Rocky Mountains.
   

2. Sources Dataset: Each measured source is classified by type: Chemical Injection Pump (CIP), Equipment leak (L), Pneumatic Controller (PC), or Tank (T). Columns show the mean Hi Flow measurement for each particular source, as well as the mean methane emitted based on the fraction of total carbon as methane (see Appendix F) and whole gas (based on methane mol %). The site where the source is located is provided. For equipment leaks, the type of leak is included. For sites where all pneumatic controllers were of the same type, these pieces of equipment are classified into Low Bleed or Intermittent (there were no sites where all pneumatic controllers were High Bleed).  Results of tank emissions measurements were not analyzed because measurements were not made at inaccessible emission points so that total tank emissions could not be fully characterized.
   

3. Raw Measurements Dataset: For each measured source, the file shows time and gas measurement. Measured values in the dataset represent gas flow measurements from the Hi Flow sampler. File contains "Source Name" and "Site Name" for each measurement. Each source has one time series with a number of readings (measurements) ranging from 1 reading to 106 readings.