Active Vibration Damper Sub (AVD™)
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APS's Active Vibration Damper (AVD™) sub* is a standalone downhole tool which adapts to changing weight-on-bit (WOB) conditions in real time to minimize drillstring vibration. By minimizing drillstring vibration, ROP, bit life and downhole component life are maximized.
The AVD is structurally similar to a shock sub with the addition of a damper section which has programmable stiffness. The AVD's damper chamber is filled with a magnetorheological (MR) fluid which has magnetically-programmable viscosity. An integrated sensor measures displacement several times per second and changes the damping factor over a 7:1 range based on current drilling conditions.
By keeping the tool string's damping in the range appropriate for the drilling conditions vibration is reduced significantly, keeping the bit in contact with the formation and increasing ROP.
On the rig, the AVD is a self-contained unit which can be treated as a piece of 'dumb iron' with no calibration or other rig maintenance required.
AVD incorporates an axial vibration sensor with 8 MB of memory. Vibration data is acquired at a rate of 1,000 samples per second, averaged and stored every 4 seconds. In addition to the maximum and average data the tool stores up to four "snapshots" of axial sensor data. 40-second sets of 1,000 sample/s raw readings are recorded.
* U.S. Patents #6,257,356 B1; #7,219,752; and #7,377,339
Download the AVD TDS to view detailed Product Specifications.
* Specifications subject to change without notice