Offshore drillships. Outside CII scope; benchmarked on per-day and per-1,000-ft drilled intensity.
Formula
$$ \text{CO}_2 = \sum_j F_j \cdot C_{f,j}, \quad \text{Intensity}_\text{ft} = \frac{\text{CO}_2}{\text{ft}/1000} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F_j$ | Mass of fuel $j$ | t | bunker log |
| $C_{f,j}$ | CO₂ factor | t CO₂ / t fuel | MEPC.364(79) |
| $ft$ | Feet drilled | ft | daily drilling report |
Sources
- IADC Sustainability Task Force.
- IOGP Report 471 - Environmental performance indicators.