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Table 5

Comparison of properties of well pads at which we detected emissions versus the entire surveyed population. DOI: https://doi.org/10.1525/elementa.381.t5

Well pad propertyAerial surveyWinter and spring ground surveys

Entire populationEmissions detectedEntire populationEmissions detected

 
% that were oil well pads 41.6% 75.0% 63.7% 62.8% 
Avg. oil production (bbl day–17 (6, 7) 41 (22, 81) 12 (10, 17) 18 (13, 32) 
Avg. gas production (MCF day–1100 (92, 109) 162 (104, 285) 84 (63, 124) 94 (62, 213) 
Avg. pad age (months) 159 (155, 163) 107 (61, 188) 154 (142, 167) 142 (123, 165) 
Avg. wells per pad 1.4 (1.4, 1.4) 1.6 (1.1, 2.3) 1.3 (1.2, 1.4) 1.3 (1.2, 1.5) 
% with glycol dehydratorsa 14.2% 22.2% 26.5% 14.3% 
% with emission controls on tanksa 13.3% 55.6% 26.5% 40.0% 
Avg. number of tanks per pada 2.6 (2.5, 2.8) 4.7 (2.3, 10.9) 2.4 (2.3, 2.6) 3.2 (3.0, 3.5) 
Well pad propertyAerial surveyWinter and spring ground surveys

Entire populationEmissions detectedEntire populationEmissions detected

 
% that were oil well pads 41.6% 75.0% 63.7% 62.8% 
Avg. oil production (bbl day–17 (6, 7) 41 (22, 81) 12 (10, 17) 18 (13, 32) 
Avg. gas production (MCF day–1100 (92, 109) 162 (104, 285) 84 (63, 124) 94 (62, 213) 
Avg. pad age (months) 159 (155, 163) 107 (61, 188) 154 (142, 167) 142 (123, 165) 
Avg. wells per pad 1.4 (1.4, 1.4) 1.6 (1.1, 2.3) 1.3 (1.2, 1.4) 1.3 (1.2, 1.5) 
% with glycol dehydratorsa 14.2% 22.2% 26.5% 14.3% 
% with emission controls on tanksa 13.3% 55.6% 26.5% 40.0% 
Avg. number of tanks per pada 2.6 (2.5, 2.8) 4.7 (2.3, 10.9) 2.4 (2.3, 2.6) 3.2 (3.0, 3.5) 

a Indicates data derived from the 2014 Utah air agencies oil and gas emissions inventory (UDAQ, 2018b). Well pads constructed after 2014 are excluded from the analyses of 2014 inventory data.

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