Permian Success: WWT Silencer Sub Damps Drilling Vibrations

Concern Drilling Though Abrasive Formations 
Drilling into the Bone Spring formations in the Permian, has caused numerous downhole MWD and tool 
failures due to vibrations.  The WWT Non-Rotating Silencer Sub assembly was utilized to dampen downhole 
vibrations, reduce stick-slip, lower torque, and provide more efficient transfer of MSE from top drive to bit. 

Silencer Sub Specifications

The Silencer Sub provides these benefits by using a non-rotating stabilizer with a low friction fluid bearing design. The stabilizer sleeve is made using a proprietary vibration absorbing polyurethane material on a 
solid steel fatigue resistant mandrel.

Silencer Sub Operation 
The WWT Silencer Sub was installed as part of the BHA assembly for the vertical, curve and lateral. The silencer was placed at the top of a conventional directional BHA, approximately 92ft from the bit.  

Wear Results 
The Silencer Sub experienced acceptable wear rates and no damage during operation, which is a considerable accomplishment given the extreme abrasive nature of the formations being drilled. The Silencer 
Sub withstood minimal wear when compared to drill pipe tool joints with casing-friendly hard-banding which 
showed significant wear.