Offshore drilling operating days measure the days a drilling rig is contracted to earn a dayrate during the reporting period under the issuer's definition.
Operating days convert a fleet from a count of rigs into a measure of revenue-producing activity.
Operating days are the activity base
Noble reported 9,267 contract-drilling operating days in 2025 across floaters and jackups.
Transocean reported 8,220 operating days in 2025.
Those totals are more informative than ending rig counts when investors want to understand how much of the fleet actually worked during the year.
A simplified revenue bridge is:
contract drilling revenue ≈ operating days × realized daily revenue
The approximation still requires care because contractual rates, downtime, incentives, reimbursements, and other revenue can differ from the headline dayrate.
Fleet additions do not create full-period operating days
A newly acquired or reactivated rig can increase fleet size without contributing a full year of operating days.
The same is true for a rig that begins a contract late in the period.
Conversely, a rig can remain in the fleet while contributing no operating days if it is stacked or between contracts.
That is why operating days belong beside Offshore Rig Utilization and Offshore Drilling Fleet Status.
Contracted does not always mean full-rate revenue
A rig can be under contract but earn a lower rate during waiting-on-weather, repair, standby, mobilization, or other contract-defined periods.
Transocean therefore separately reports Offshore Drilling Revenue Efficiency.
Operating days describe contracted activity. Revenue efficiency describes how effectively that contracted time converts into revenue.
Primary-source examples
Offshore drilling operating days are most useful as the contracted-activity base that connects fleet capacity with utilization and dayrate revenue.
Part of the Offshore Drilling Operating Model
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