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Drillstring Vibration Part 2b: Torsional Resonance Mechanism
Автор: Oil Drilling Channel
Загружено: 2019-09-28
Просмотров: 1626
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This is specifically “drill collar torsional resonance” as a natural torsional frequency of the drill collars that is being excited. This specific type of vibration occurs predominantly in very hard rocks when drilled with a PDC bit. It is most damaging at higher rotational speeds where higher amplitude resonance at harmonics of the collar’s natural frequency can occur. The higher amplitude fluctuations can, in some cases, lead to a backwards turning of the bit and cutter damage. Damage to downhole electronic
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