Drillstring Failure Downtime Cost Estimator

Roughly 75% of drill collar failures concentrate at the box connection, and non-productive time (NPT) from a downhole failure is billed at your rig’s day-rate. Estimate what a failure-driven delay could cost, based on published day-rate ranges.

Day-rate figures per Macdonald, K.A. & Bjune, J.V. (2007), “Failure analysis of drillstrings,” Engineering Failure Analysis, 14(8). These are published industry reference ranges, not a quote for your specific rig or contract — use your own rig day-rate for a precise figure.