Results 11 to 20 of about 643,401 (321)
Vibration of Periodic Drill-Strings with Local Sources of Resonance
Vibration, 2021 A new class of drill-strings is proposed for attenuating undesirable vibrations to ensure effective operation. The drill-string is provided with passive periodic inserts, which are integrated with sources of local resonance (LR).
Wael Akl +3 more
doaj +1 more source
Stick–Slip Vibration Characteristics Study of the Drill String Based on PID Controller
Energies, 2023 In order to address the issue of drill string stick–slip vibration, which leads to drill bit wear and reduces the drilling velocity, we conducted a study on the characteristics of stick–slip vibration using a proportional-integral-derivative (PID ...
Baoyong Yan +3 more
semanticscholar +1 more source
An impedance approach to reduce the contact-instability whilst drilling with active heave compensation [PDF]
, 2012 The bit-bounce, or contact-instability, phenomenon which occurs in the drill string suspended from a floating vessel with an active drill string compensator to maintain a steady weight on the drill bit is investigated.
Dunnigan, Mathew Walter, Hatleskog, Jan
core +1 more source
ABC for model selection and parameter estimation of drill-string bit-rock interaction models and stochastic stability [PDF]
Journal of Sound and Vibration, 2022 The bit-rock interaction considerably affects the dynamics of a drill string. One critical condition is the stick-slip oscillations, where torsional vibrations are high; the bit angular speed varies from zero to about two times (or more) the top drive ...
D. Castello, T. Ritto
semanticscholar +1 more source
Processes, 2023 Drill-string axial vibration at the surface technology is proposed to reduce the friction between the drill-string and the borehole wall, and to improve load transfer efficiency, the rate of penetration (ROP), and the extended-reach limit of a horizontal
Yuan Long +3 more
semanticscholar +1 more source
Energy Reports, 2023 Large amplitude and high frequency WOB (weight on bit) fluctuation will lead to problems such as low rock breaking efficiency, short service life and slow drilling speed. This problem is particularly prominent in hard and difficult to drill formation and
Liu Yongwang +5 more
doaj +1 more source
Response analyses on the drill-string channel for logging while drilling telemetry
Petroleum Science, 2023 Downhole acoustic telemetry (DAT), using a long drill string with periodical structures as the channel, is a prospective technology for improving the transmission rate of logging while drilling (LWD) data.
Ao-Song Zhao +3 more
semanticscholar +1 more source
Sound&Vibration, 2023 During the drilling process, stick-slip vibration of the drill string is mainly caused by the nonlinear friction generated by the contact between the drill bit and the rock.
Kanhua Su +5 more
semanticscholar +1 more source
On physical models in V.I. Gulyayev's three papers on drill string whirling and torsional vibrations
Petroleum, 2020 This paper introduces physical models of drill string whirling and torsional vibrations and analyses the physical models in V.I. Gulyayev's three papers on drill string whirling and torsional vibrations: “V.I. Gulyayev, L.V.
Zifeng Li, Chaoyue Zhang, Guangming Song
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DRILL COLLAR STRING DESIGN AND ITS EFFECT ON DRILLING M.E.R. [PDF]
Proceedings of Drilling and Rock Mechanics Symposium, 1963 The problem of obtaining a Maximum Economic Rate of drilling is the main task of engineers, tool pushers, superintendents, field drilling foremen and people involved in drilling research problems. A rig drilling at its Maximum Economic Rate will always make hole at a rate less than the maximum rate of penetration.
Fred K. Fox, Nadim Nasir
openaire +1 more source