1.2.3 Flow Restrictor Use and Availability
If the desired pad pressure cannot be achieved by nozzling the bit alone, a flow restrictor can be used.
A PowerDrive Flow Restrictor provides additional pressure drop at the RSS tool to increase pad
pressure and force without affecting the bit TFA. PD
2
includes the ability to suggest a flow restrictor
size to achieve a desired pad pressure. Be sure to verify the suggested size is available in the standard
restrictor kit list below.
475 Restrictors (x/32“) - 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 22, & 24
675 Restrictors (x/32“) - 16, 18, 20, 22, 24, 26, 28, 30, & 32
900 Restrictors (x/32“) - 26, 28, 30, 32, 34, 36, & 38
1.3 Magnetic Material Removal
Magnetic material present in the mud is highly detrimental to the performance of the PowerDrive control
unit. Magnetic material passing through the torquers causes excessive friction and can lead to toolface
stability issues or complete torquer jamming. To mitigate magnetic material related issues, it is
mandatory to run ditch magnets in the circulating system and clean them at least twice daily.
Ditch magnets should be installed in the flow line, header tanks, and/or possum belly of the shale shakers.
Ditch magnets should be installed and cleaned prior to picking up PowerDrive to ensure the tool is
introduced to a clean system. When adding pre-mixed mud from an outside source, efforts should be
made to run that mud across the magnets prior to pumping it downhole for the first time.
1.4 Tool Specifications