Method and apparatus for suppressing drillstring vibrations

Details Method and apparatus for suppressing drillstring vibrations Method and apparatus for suppressing drillstring vibrations

E - Fixed Constructions

21

B

E21B 17/07 (2006.01) E21B 17/00 (2006.01) E21B 47/01 (2006.01) E21B 47/12 (2006.01) F16F 15/02 (2006.01)

Patent

CA 2244558

Apparatus and methods are described for isolating in a drillstring a device from acoustic noise by introducing between the device and a source of acoustic vibration an noise isolating apparatus, wherein the noise isolating apparatus has adjacent zones of different acoustic impedance. The zones are preferably created by zones of different thickness and designed such that noise suppression occurs in a predetermined range of acoustic frequencies. In a preferred application the apparatus and method is used in combination with drillstring telemetry.

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