Weekly HSE Lateral Learning 050105

1
Weekly HSE Lateral Learning 05/01/05
29/12/04 MB Pet N.M. 0P C3P Rig-88, When
attempting to test the completion tubing to
69000kPa the 3.5 New Vam to 3.5 IF cross over
from the completion tubing to the pumping sub was
leaking. It was changed out for the MB slick line
unit's crossover (3 ½ Vam - 5 ¾ Otis) and then
crossed back to fit the pumping sub connection.
The tubing was re-tested, but the crossover
leaked at 60,000kPa. On investigation the
crossover was only rated to 35000kPa and not
69,000kPa. This crossover should have been rated
to 69000kPa because it was part of the 69000kPa
lubricator equipment that was going to be used
for the next stage of the operation. LEARNING The
root cause of failure was mobilizing to site
without performing the 10k load-out checklist to
check that crossovers matched callout
requirements with regard to thread pattern
pressure rating. Also upon arrival and use at the
rigsite the supervisors did not go through their
equipment and recognise that one of the X-Overs
was not suitable. Many opportunities were missed
to pick up this rogue X-Over

Pin hole
Picture 2
Pressure testing to 10 k.lbs with a sub in the
assembly rated to 5 k.lbs

• ACTIONS
• The 10k load out form is to accompany all
  load-outs where multiple x-overs are sent on a
  unit. No job is to start without this form.
• DSVs are to assure themselves, through questions
  and evidence, that all equipment supplied is
  rated to the correct value for the job
• DSVs to hold pre-job meetings and use this
  opportunity to ask questions relate to the
  equipment
• TBT prior to job should have talked through
  equipment.
• How was this X-Over to be torqued up? Given the
  position of the band-it strap