Campaign Operating days / year d Feet drilled / year ft Fuel Fuel Heavy Fuel Oil (HFO / RME..RMK) Very Low Sulfur Fuel Oil (VLSFO, ≤0.50% S) Ultra Low Sulfur Fuel Oil (ULSFO, ≤0.10% S) Light Fuel Oil (LFO / RMA..RMD) Marine Gas Oil (MGO / DMA, DMZ) Marine Diesel Oil (MDO / DMB) LNG - Otto cycle, medium-speed (4-stroke dual-fuel) LNG - Otto cycle, slow-speed (2-stroke low-pressure) LNG - Diesel cycle, slow-speed (2-stroke high-pressure) LNG - lean-burn spark-ignited (LBSI) LPG - Propane LPG - Butane Methanol - grey (natural-gas feedstock) Bio-methanol e-Methanol (RFNBO from renewable H2 + captured CO2) Ammonia - grey (steam-methane reforming) Ammonia - blue (SMR + CCS) Ammonia - green (electrolytic, renewable) Hydrogen - grey (SMR) Hydrogen - green (renewable electrolysis) Bio-LNG - Otto cycle, medium-speed Bio-LNG - Otto cycle, slow-speed Bio-LNG - Diesel cycle, slow-speed Bio-LNG - lean-burn spark-ignited FAME biodiesel (B100, waste feedstock) HVO / Renewable Diesel (waste feedstock) Mass t ×
+ Add fuel CO₂ per drilling day 97.33 t/day CO₂ per 1,000 ft 181.67 t / kft Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.