Investigation Report
Subsea Tree Dropped During Retrieval Damages Jumper
01-02-2014 02:17 G15546 GC 113 Structural Damage / Incident >$25K / Equipment Failure / Human Error
- BSEE
- Investigation Report
- Unknown
- Dropped objectsHuman factors
- Lifting operationsROV operationsWell intervention
- Remotely operated vehicle
- Functional testingOperating and work proceduresSafety communication
- Upstream oil and gas
- Subsea
Summary
Investigation of a subsea tree dropped during retrieval from Marubeni’s A002 well, damaging the A004 jumper. Findings examine incomplete retrieval-tool testing, omitted over-pull verification, obstructing ROV debris, an ambiguous locking indicator and misunderstood safe-zone instructions. The report records subsequent recovery and repairs, with no district recommendations at that time.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Human factors; human performance; ergonomics.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: ROV operations; remotely operated vehicle operations.
Classifications: Well intervention; workover; well servicing.
Classifications: Remotely operated vehicle; ROV; underwater robot.
Classifications: Functional testing; function test.
Classifications: Operating and work procedures.
Classifications: Safety communication; toolbox talk; toolbox talks.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.