Investigation Report
Backup Wrench Die Falls to Drill Floor During Drilling
08-13-2015 00:30 G34634 WR 160 Other Lifting Device
- BSEE
- Investigation Report
- Unknown
- Dropped objectsHuman factorsMechanical failure
- DrillingLifting operations
- Operator displays and control interfaces
- Competence and trainingExclusion zonesOperational supervision
- Upstream oil and gas
Summary
Investigation of a backup wrench die falling approximately 136 feet to the drill floor during drilling aboard Discoverer Americas. Hoisting continued while the wrench remained engaged. The report examines missed interface warnings, equipment unfamiliarity, absent specific training and inadequate supervision. Personnel avoided injury by remaining outside the red zone.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Human factors; human performance; ergonomics.
Classifications: Mechanical failure; equipment failure.
Classifications: Drilling; well drilling.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Operator displays and control interfaces.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Exclusion zones; red zones; restricted access zones.
Classifications: Operational supervision.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.