Results 171 to 180 of about 584,502 (236)

Experimental Verification of Vibration Mitigation Through a Viscous Damping System Along the Drill String

Day 1 Tue, March 07, 2023, 2023
Achieving optimal performance during drilling of complex well trajectories is often hindered by downhole drill-string vibrations and stick-slip. These can lead to drill bit and downhole tool damage, drill-string wear possibly leading to a twist-off, or
Andrew Holsaeter, A. Ambrus, E. Cayeux, Rodica Mihai, S. Moi   +4 more
semanticscholar   +1 more source

Fatigue of Drill String Connections

Journal of Offshore Mechanics and Arctic Engineering, 1995
Abstract This paper reports full-scale tests on threaded connections used in drill strings. A concise background is given concerning the in-service environment and loading conditions on the connections. This details some of the reasons particular steels are used in preference to others. Crack growth data is given for ten full-scale axial
openaire   +1 more source

Longitudinal Vibrations of a Drill String

The Journal of the Acoustical Society of America, 1965
When drilling an oil well with a rotary drill, the penetration rate often can be substantially increased by superimposing a vibratory motion on the rotating bit. In order to evaluate drilling methods that would include both rotary and vibratory action, a study has been made on the vibrational characteristics of long drill string. The resonant frequency
openaire   +1 more source

Ground Measurement of Noise Characteristics in Drill String During Drilling

SSRN Electronic Journal, 2022
Liu Yongwang, Lin Guojun, Du Binbin, Guan Zhichuan, Zhao Guoshan   +4 more
openaire   +1 more source

Experimental investigation of the effect of rotation rate and current speed on the dynamic response of riserless rotating drill string

Ocean Engineering, 2023
Yu Wang, Mingyang Lou, Yang-yang Wang, Changhong Fan, Chaohui Tian, Xiao-liang Qi   +5 more
semanticscholar   +1 more source

Data transmission in a drill string

The Journal of the Acoustical Society of America, 1984
Data is transmitted through a drill string by means of acoustical energy by transmitting an acoustical signal for a first predetermined interval and ceasing transmission of the signal for a second predetermined interval to represent a first binary state; ceasing transmission of the signal for a third predetermined interval to represent a second binary ...
openaire   +1 more source

Distributed model for the drill-string system with multiple regenerative effects in the bit-rock interaction

Journal of Sound and Vibration, 2023
Mohammad Amin Faghihi, Hossein Mohammadi, E. A. Yazdi, M. Eghtesad, Shabnam Tashakori   +4 more
semanticscholar   +1 more source

Experimental investigation on axial–torsional coupling nonlinear vibration characteristics of multi-body drill string system in oil and gas wells

Nonlinear dynamics
Xiaoqiang Guo, Shihong Xiao, Xianping Qiu, Xinye Li, Ning Hu, Liming Dai   +5 more
semanticscholar   +1 more source

Drill-string stability and stress localization: Influence of complex delay effects and dry friction

International Journal of Non-Linear Mechanics, 2023
Xianbo Liu, Guang Meng, Balakumar Balachandran   +2 more
semanticscholar   +1 more source

Influence of torsional stick-slip vibration on whirl behavior in drill string system

Geoenergy Science and Engineering, 2023
Yong-Min Choe, Gwang-Su Kim, In-Song Kim, J. Cha, K. Ri, Yong Han, Chol-Ho Kang   +6 more
semanticscholar   +1 more source