WHAT HAPPENED: NM

1
Shell EPW Wells HSE Early Learning Bulletin
Fountain No 132237 Location RTD Rockies
Date 5/20/2007 Risk Ranking Actual
Level 1 - Asset Potential C4 - People
WHAT HAPPENED NMMATERIALS FALL 150 FEET FROM
DERRICK CLIMBER ASSIST. During a post
rig/derrick stand-up inspection, the two climber
assist counter weight anchor lines were found to
be tangled, causing one of the counter weights to
slightly invert. As attempts were made to
untangle the lines, the contents of the counter
weight spilled and fell approximately one hundred
and fifty feet to the ground. The counter weight
contents consisted of one large rock and one
four-inch anchor pin weighting approximately 25
lbs.  

• Early Learning Points
• Requirements for counter weight anchor line
  positioning and handling not addressed prior to
  raising derrick.
• JSA and work plan to untangle lines did identify
  the inverted counter weight and the associated
  hazard of the counterweight contents.
• Poor design of counter weight (open top and no
  means to view direction of travel).
• Non-engineered and improperly secured materials
  used to provide weight.

Line that entangled around counter weight.
This Learning Bulletin provides preliminary
learnings. A detailed investigation is pending.