From the Rig Floor Report

Splitting planning, drilling and evaluation across vendors is how a rig ends up with three versions of the same wellbore and no one accountable for the discrepancy. Bundling them is an admission that in deep water the expensive failure is rarely a tool — it is a decision made on stale information. Appraisal at 2,372 m is exactly where the cost of finding out late is highest.

Note the ratio: roughly seven development wells for every exploration well. This is not a wildcat programme dressed up as one; it is a decision that the cheapest molecule available is the one you can tie into a plant you already own. Fast-track economics live or die on whether existing facilities behave as modelled — which makes the integrity and behaviour of aging infrastructure the binding constraint, not the drilling.

A year of early production on three fields is the single largest value item on this list, and it came from execution rather than discovery. It is worth being precise about what that means: on a tie-back, the schedule is won or lost in the interfaces — between the new wells and the host, between the drilling programme and the subsea scope. Pulling a year out means those interfaces were understood before steel moved, not renegotiated after.

Inventory in a known play is a bet on repeatability. It only pays if the hundred-and-first well behaves like the first hundred, which is a data and process question long before it is a geology question. The operators who convert inventory into returns are the ones whose per-well variance keeps falling as count rises.

Frontier drilling and plug-and-abandonment are the same engineering problem viewed from opposite ends: both are dominated by uncertainty about what the wellbore will actually do, and in both the cost of being wrong is measured in days of rig time. A contractor buying into geothermal and an alliance scaling decom are hedging the same thing — that the conventional middle of the market is where competition is fiercest.