Cleanup Cycles - Extreme Networks PowerDrive Orbit Quick Operation Manual

PowerDrive Orbit & X6
•
Start drilling with reduced WOB and RPM to minimize potential of localized shocks to the
PowerDrive Tools (often not seen on the MWD). If high levels of shock and vibration are seen,
stop drilling.
•
If other stabilizers are included in the BHA, control surface RPM to approximately 60 rpm as the
stabilizers pass the window.
•
Monitor the levels of magnetic interference as drilling progresses to ensure that the BHA is not
tracking down the side of the casing string.
•
When drilling ahead out of a whipstock, the MWD/LWD tools maybe exposed to DLS higher than
their specifications (especially if rotation is planned with part of the BHA across the whipstock
face). It is important that these operations are discussed with the Client at the planning stage.
When exiting casing or sidetracking off a whipstock:
•
Make sure that the Bias Unit and Control Stabilizer have passed the window before rotating.
•
If required, wash through the window without rotation and using low flow to prevent Bias Unit pad
damage. Make sure that no tight spots are encountered.
When using a motor with PowerDrive, the lower part of the BHA below the motor will always be
rotating when the pumps are on. Thus, the practice of washing past the whipstock face will still
involve some rotation of the PowerDrive tool.

Cleanup Cycles

3.9
Upon reaching TD it is normal for a client to perform a cleanup cycle. While performing a cleanup cycle
it is critical that drilling parameters are closely monitored for shock and vibration. It is not uncommon to
drill a well successfully to TD and then damage a PowerDrive during the shock and vibration induced
during a cleanup cycle. It is strongly recommended to perform as much of the cleanup cycle on bottom
as possible. The following graphic shows the difference in shock and vibration on-bottom vs off-bottom.
The left side of the graphic shows the last 2 stands drilled with minimal shocks and on the right side of
the graphic the client is performing an off-bottom clean-up cycle and devastating shocks are recorded.
It is vital to discuss the cleanup cycle with the client prior to starting the operation. The following
procedure is a best practice to minimize damage.
For the last stand before TD:
1. Control the ROP to 10-15'/hour, keeping the same drilling flow rate and 100 surface RPM
2. Lower the ROP to <10'/hour if more circulation is needed
3. Watch the real time chock closely, change drilling parameters if needed
4. One bottom up circulation after reaching TD, then POOH
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Quick Operations Guide - rev1.4
Page 22 of 35