What happened: NM DRILL COLLAR SLIPS THRU ELEVATORS The drill crew was picking up and running BHA bo

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Shell EPW-RTD HSE Early Learning Bulletin
Fountain No 307774 Location US.
New Mexico Date 26 Sept. 2008
What happened NM - DRILL COLLAR SLIPS THRU
ELEVATORS The drill crew was picking up and
running BHA (bottom hole assembly) components.
The elevators were lowered and latched on to the
lifting sub of a 6 ½ heavy weight drill collar
which was sitting on the hydraulic carrier. As
the collar was raised with the top drive to
approximately 20, the lifting sub slipped out of
the elevators. The collar fell against the
draw-works guard cover and the pin-end slid off
the hydraulic carrier to the ground level,
striking the HPU power source cable. The lifting
sub end of the collar stopped at the top of the
V-door.

• Preliminary Learning Points
• Elevators were not changed when 8 BHA tools
  changed to 6 ½ drill collars .
• The scope of the JSA Tripping in Hole w/ BHA
  should
• Address specific OD changes in tools
• Reference JSA Changing out Elevators
• The JSA Pause process should be used when changes
  in job scope or unexpected delays require
  reassessment of risk.
• Immediate Corrective Actions Taken
• Color coordinated elevators and lifting subs to
  prevent potential mismatches in the future.
• Re-emphasize policy of measuring OD on all lift
  subs prior to task performance

Elevators
6 ½ lifting sub
This Learning Bulletin provides preliminary
learnings. A detailed investigation is pending.
For Internal Use Only