Investigation Report
Bottom Hole Assembly Dropped During Drilling Operations
07-15-2009 21:50 G15607 GC/743 Incident >$25K - Dropped BHA
- BSEE
- Investigation Report
- Unknown
- Dropped objectsHuman factorsMechanical failure
- DrillingLifting operations
- Lifting accessories
- Competence and trainingJob safety analysisOperating and work proceduresOperational supervision
- Upstream oil and gas
- Offshore installation
Summary
An investigation examines the loss of an 81-foot bottom hole assembly during drilling operations on Development Driller II. Rotation loosened the lift-sub connection before lifting, and the remaining threads failed. No injuries occurred. Findings address experience, supervision and incomplete hazard identification, with measures covering procedure review and connection monitoring.
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: Lifting accessories; lifting gear; rigging gear.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Job safety analysis; JSA; job hazard analysis; JHA.
Classifications: Operating and work procedures.
Classifications: Operational supervision.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.