Keith Rappold Drilling Editor The use of vibration measurements to detect bit and drillstring dysfunctions in real time can improve drilling efficiency. Elf Aquitaine Production has developed a surface sub to detect vibrations in the drillstring in the well. This drilling dynamics sub, or dynameter, measures resonance phenomena (axial, torsional, and lateral vibrations) from the bit, bottom hole assembly, and drillstring. A description of how this sub is used to identify and help eliminate stick-slip will appear in the concluding article in this series. During stick-slip, the bit stalls and accelerates cyclically as the rotary speed at the ...

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