Results 271 to 280 of about 643,401 (321)

Drill String Strength Evaluation for Deep Earthquake Zone Drilling

Volume 1: Offshore Technology, 2012
The scientific drilling vessel Chikyu was designed to have the deep drilling capability to reach the deep earthquake zone. To realize such deep drilling, a drill pipe with higher than ever strength and reliability is of necessity. A strength evaluation of such high strength drill pipe is also necessary. Around Japan, the earthquake zones
Tomoya Inoue, Masanori Kyo, Koji Sakura, Toshihiko Fukui   +3 more
openaire   +1 more source

Drill-String Dynamics: Reduced-Order Models

Volume 10: Mechanical Systems and Control, Parts A and B, 2009
Research efforts are underway to model and study the dynamics of a drill string, and preliminary results are presented in this work. The dynamics of a drill string system has non-smooth characteristics. Moreover, the drill string system dynamics exhibits qualitative changes with respect to the rotation speed of the drill string and friction ...
Chien-Min Liao, Balakumar Balachandran, Mansour Karkoub   +2 more
openaire   +1 more source

Efficiency of releasing stuck drilling string

Azerbaijan Oil Industry, 2021
While drilling oil and gas wells, 10–15 % of open part of wellbore consists of permeable fractured reservoirs and horizons. Despite of it, 70–80 % of failures occurring in wellbore fall on the permeable suites. After sticking electrical measurement only upper interval is specified.
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

Dynamic characteristic response of PDC bit vibration coupled with drill string dynamics

Geoenergy Science and Engineering, 2023
M.A.O. Liangjie, Junjie He, Junlong Zhu, Hai-jun Jia, Lu Gan   +4 more
semanticscholar   +1 more source

Control of drill string torsional vibrations using optimal static output feedback

Control Engineering Practice, 2023
H. J. C. Cruz Neto, M. A. Trindade
semanticscholar   +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

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

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