Every pump change workover (assuming 1/3 of 4,800’ tubing string needs replacing, which is common for Melstone, MT wells) creates 11.7 tons of CO2 emissions:
Tons of CO2
1/3 of 4,800′ 2-7/8″ Tubing String Replacement
7.1
ESP Pump Manufacturing
0.5
Rig work (3 days)
4.1
Total
11.7
Assuming workover frequency extended from 3.5 to 7 years (based on performance on Melstone, MT wells):