Results 241 to 250 of about 69,267 (280)

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
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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 ...
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Mechanical Analysis of Drill Strings in Horizontal Directional Drilling

ICPTT 2011, 2011
A large number of failure cases on horizontal directional drilling arise from complex forces, difficult mechanical analysis and lack of theoretical basis of construction parameters. So it's of great engineering value to make mechanical properties of horizontal directional drilling clear.
Yihua Dou, Yinping Cao
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Development of an Instrumented Drill String for Measuring Drilling Forces

Volume 13: Acoustics, Vibration and Phononics, 2017
The National Institute for Occupational Safety and Health (NIOSH) Pittsburgh Mining Research Division (PMRD) conducts a wide variety of mining-related health and safety research. As part of this research, PMRD’s Workplace Health Branch maintains a Noise Control Team tasked with developing noise controls to reduce future incidences of noise-induced ...
Jeffrey Shawn Peterson, Brian Kim
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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
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Analysis of the Influences of Drilling Fluid Flow Velocity inside and outside the Drilling String on Drilling String Lateral Vibration Frequency

Advanced Materials Research, 2013
Drilling string lateral vibration is a severe damage,which is influenced by many complex factors. This paper makes a theoretical analysis of the drilling string lateral vibration frequency caused by drilling fluid flow velocity inside and outside the drilling string, which supplies some evidence for calculating rotation speed of rotary table and ...
Tie Yan, Li Wang, Xiao Feng Sun, Jun Bo Qu   +3 more
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Analysis of the Influences of Drilling Fluid Flow Velocity inside and outside the Drilling String on Drilling String Lateral Vibration Frequency

Advanced Materials Research, 2014
Drilling string lateral vibration is a severe damage,which is influenced by many complex factors. This paper makes a theoretical analysis of the drilling string lateral vibration frequency caused by drilling fluid flow velocity inside and outside the drilling string, which supplies some evidence for calculating rotation speed of rotary table and ...
De Da Hou, Qing Bin Zhang, Yun Hua Cui, Cheng Dong Zhang   +3 more
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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
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Computer modelling of drill string of an oilwell drilling rig

2018 14th International Conference on Advanced Trends in Radioelecrtronics, Telecommunications and Computer Engineering (TCSET), 2018
The article considers the questions of construction and computer realization of the mathematical model of drill string of a drilling rig. An approximation model is proposed in the form of systems of ordinary differential equations. Built on their basis, the computer model of the drill string has several important properties: allows you to reproduce the
Andriy Verlan, Volodymyr Fedorchuk
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A telegrapher equation for electric - telemetering in drill strings

IEEE Transactions on Geoscience and Remote Sensing, 2002
A reliable method of transmitting downhole information to the surface while drilling is essential to improve drilling applications. We have designed a numerical algorithm for simulation of electric-signal transmission through the drill string, based on the telegrapher equation (a circuit model).
José M. Carcione, Flavio Poletto
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