... between the number and arrangement of cutting elements and frequency peaks on a plot of amplitude versus cycles per revolution. Frequency peaks were observed at multiples of the number of cutting elements. In general this relationship was strongly visible on the PDC bit data but not as strongly visible...

...Roald Sørheim; John Eirik Paulsen; Arild Saasen; Jérôme Leleux; Arnaud Albouy; Trond Knapp Haraldsen; Per Anker Pedersen; Thomas Hartnik; Roar Linjordet This paper presents the potential of composting oil wet drill cuttings as a drilling waste disposal option. The potential is substantiated...

...Jeffrey D. Childs; Edgar Acosta; John F. Scamehorn; David A. Sabatini Surfactant-enhanced washing of oil-based drill cuttings was evaluated as a technology of benefit to domestic oil producers. Laboratory studies showed the branched C14-C15 alcohol propoxylate sulfate to be a promising surfactant...

...M. A. Elsayed, Mem. ASME; L. F. Washington, Mem. ASME Previous research in stability of drillstrings was based on the assumption of constant material specific force, i.e., a bit force that is proportional to the area of cut. Moreover, earlier work used a simplified bit model that consisted...