Safety Alert
Failure to Torque Lift Sub Results in Dropped Monel Drill Collar
Failure to Torque Lift Sub Results in Dropped Monel Drill Collar
- IADC
- Safety Alert
- IADC Alert 13-30
- Control of WorkDropped ObjectsLifting Operations
- Dropped objects
- DrillingLifting operations
- Lifting accessories
- Upstream oil and gas
Summary
During bottom hole assembly make-up, a lifting sub screwed into a monel drill collar with chain tongs unscrewed while the crew connected a float sub to the stabiliser. After the iron roughneck was removed, the assembly fell from the rig floor through the V-door onto the pipe-cat.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Drilling; well drilling.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Lifting accessories; lifting gear; rigging gear.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Summary
An alert about a drill collar dropping after a lift sub was insufficiently torqued.
IADC Alert 13-30. Themes: control of work, dropped objects, lifting operations.