05226332 is referenced by 30 patents and cites 3 patents.

A vibration monitoring system operates down-hole in the bottom hole assembly above the drill bit. This system includes four spaced accelerometers which measure and differentiate between lateral, longitudinal and torsional drillstring vibrations. Three of the four accelerometers are in a cooperative spaced arrangement and measure tangential acceleration forces on the outer diameter of the drillstring for determining and measuring both lateral and torsional vibrations. The fourth accelerometer measures longitudinal vibration. Two embodiments are disclosed for arranging the three accelerometers which measure lateral and torsional vibration. In a first embodiment, the accelerometers are equi-spaced 120 degrees apart from one another. In a second embodiment, the three accelerometers are spaced 30 degrees apart from one another within a 60 degree arc. In both embodiments, all four accelerometers are positioned within the annular wall of a drill collar segment.

Title
Vibration monitoring system for drillstring
Application Number
7/703171
Publication Number
5226332
Application Date
May 20, 1991
Publication Date
July 13, 1993
Inventor
Mark E Wassell
Glastonbury
CT, US
Agent
Fishman Dionne & Cantor
Assignee
Baker Hughes Incorporated
TX, US
IPC
E21B 47/00
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