Laboratory drilling tests have been used successfully to determine the tendency of a PDC drag bit to whirl. Drill bit whirl has been demonstrated in all four drilling simulators where whirl tests were performed. This paper describes the design and testing of anti-whirl PDC drag bits. The verification process of the anti-whirl concept, which includes both laboratory and field tests, will be emphasized. Results from the laboratory drilling experiments that measure a bit’s propensity to vibrate are presented. Additionally, results from more than 60 field runs are summarized and discussed, with three successful field runs discussed in detail.
No takes yet. Share an insight, caveat, or question.
Cooley et al. (1992) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: