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- W3199667829 abstract "Abstract This paper reviews field data where high-frequency torsional oscillation (HFTO) was seen on previous bit runs and hypothesizes on features or design metrics that may have directly influenced this vibration. This paper investigates four metrics of bit design: Cutter wear, shear length:shear area ratio, choice of secondary cutter material, and effective backrake. Hypotheses are established linking these metrics to HFTO, and then data from field runs is shown to correlate the hypotheses. At this point, a bit was designed and manufactured to put the HFTO avoidance hypotheses into practice. Prior to laboratory testing, a theoretical model is used to identify resonant torsional frequencies. A series of laboratory experiments followed to test the hypotheses and demonstrated that there is correlation between all factors, but in one case is counter to the hypothesis. This information is of use when selecting or designing bits in environments where HFTO is known to occur. The findings may also assist in explaining performance that's below expectations where HFTO is not able to be explicitly measured." @default.
- W3199667829 created "2021-09-27" @default.
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- W3199667829 date "2021-09-15" @default.
- W3199667829 modified "2023-10-11" @default.
- W3199667829 title "Bit Design Methodology to Mitigate High-Frequency Torsional Oscillation" @default.
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- W3199667829 doi "https://doi.org/10.2118/206353-ms" @default.
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