3.10 Re-Run Evaluation
When evaluating if a PowerDrive can be rerun, the PowerDrive Rerun Checklist should be used. This
spreadsheet will determine if the tool can be “Re-run”, “Re-run – Proceed with Caution”, or “Tool should
not be re-run”. The following questions are asked as a part of the re-run criteria. If the re-run checklist is
not available, use these questions as a discussion on whether the PowerDrive should be rerun.
Post Run(s) Information
• Was the PowerDrive Orbit the reason for pulling out of the hole? If so then it should not be rerun.
• While monitoring the real-time data was there any indication that the tool was having issues
maintaining toolface? Was the tool operating as intended?
• What was the maximum shock level that the tool saw over a 30-minute duration? If catastrophic
shocks (Level 3) are maintained, then the tool should not be re-run.
• What was the maximum temperature on the run? Anything above 150° C is over the tool’s rated
limits and should not be run again.
• How many pumping hours are currently on the tool? There is no limit to how long a PowerDrive
will theoretically operate for, however as the pumping hours increase the tool can start to see a
decrease in performance due to wash, friction increases, pad wear ect. The environment in
which this tool is operating in will need to be considered to determine if an hour limit will be
placed on PowerDrive.
• What is the average bit RPM? If the average is over 350 RPM, then caution should be used
before rerunning.
• Is there LCM present in the mud system? Was it introduced during the run or at the end? If the
LCM is compatible with PowerDrive as shown in the LCM charts, then there should be no issue.
However if the LCM contains cotton seed hulls or cedar fiber then the tools should not be re-run
as there could be issues with plugging the filter screen or jamming.
• Are the ditch magnets present and have they been regularly monitored and cleaned? If not, then
the tool should not be re-run.
• Has there been evidence of elastomer in shakers or in tool/bit (possible motor chunking)? If yes,
then the PowerDrive should not be re-run as there is a high risk that the rubber has gotten into
the tool and will cause the PowerDrive to jam.
Post Run(s) Surface Observations
• Are the pads excessively worn?
o Grade 1: No buttons or tiles exposed.
o Grade 2: Buttons or tiles exposed but no groove around them. No worn edge on the
sides.
o Grade 3: Light wear on edges. Buttons or tiles with groove around them.
o Grade 4: Heavy wear on edges. Buttons or tiles removed. External face is damaged.
• Are the Bias Unit sleeves cracked? If so, the tool should not be re-run.
• Can the pads open freely? If not, the tool should not be re-run.
• Is a hinge pin broken? i.e. Can the pad move, other than pivoting on the hinge pin? If so, then
the tool should not be re-run.
• Does the flow restrictor body/carrier have signs of internal erosion? At a minimum the flow
restrictor body will need to be replaced. However it is important to note that if this component is
washing, then most likely there is additional wash internal to the tool, proceed with caution.
• Are the anchor bolts present without wash or cracks?
• Is the stabilizer suitable to run again (Recommended 1/8” under gauge)?
Between Runs
• Was the tool flushed with water (WBM) or base oil (OBM) prior to being racked? If not, proceed
with caution.
• Was the tool racked back for over 24 hours?
• Was the tool stored at a temperature below 0° C?
Next Run
• What is the expected run length? This will need to be considered along with previous pumping
hours.
• Do the flow rates and mud weight in the next run comply with the current tool set-up?
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