2. Stop the tool rotation
3. Cycle the pumps to take a survey.
4. If available, check for a good static survey by monitoring INCL_b and AZIM_b. If they deviate
significantly from their acceptable values, then either continue in manual mode or do the survey
again.
5. Send downlink command 2-30 to engage HIA. Note: Tool will switch to GTF after it engages HIA
6. If available, monitor IH_TRGT_b and AZI_TRGT_b to make sure they are acceptable. If they are
not correct, then disengage HIA and then either continue in manual mode or do the survey again
and engage HIA again.
Nudge the Inclination
The target inclination nudge size is fixed at 0.5°. Use the downlink commands that follow to change the
target inclination:
• 2-22: Increase target inclination by 0.5°
• 2-23: Decrease target inclination by 0.5°
The inclination nudges are applied over five drilling cycles in steps of 0.1°. If several nudges are sent
then all but the last nudge will be applied immediately, the last nudge will be applied gradually.
Nudge the Azimuth
The target azimuth nudge size depends on the tool’s inclination.
Use the downlink commands that follow to change the target azimuth:
• 2-18: Increase target azimuth
• 2-20: Decrease target azimuth
The azimuth nudges are applied over five drilling cycles. If several nudges are sent then all but the last
nudge will be applied immediately, the last nudge will be applied gradually
Disengage HIA
To disengage HIA, send an absolute downlink command: 1-0 thru 2-12. Tool will remain in GTF after
it disengages HIA.
3.6.3 Rate of Penetration Ranges
Inclination Hold and Hold Inclination and Azimuth have a downlinkable ROP Index, which can be
changed based on the ROP. The ROP index will define the gain of the Inclination control loop. In some
cases, at high rate of penetration, PowerDrive may oscillate around the target inclination. This
oscillation can cause micro-dogleg, increasing the tourtosity of the well. In this case it is recommended
to reduce the gain by downlinking command 2-21 Low Gain. It is recommended to only downlink
into the Low Gain setting if needed and not based on the actual ROP. If PowerDrive is downlinked
into the Low Gain setting and there is no improvement, then it is recommended to go back to the High
Gain setting.
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