Results 261 to 270 of about 643,401 (321)

Performance of Drill String Hardfacings

Journal of Energy Resources Technology, 1984
Drill string hardfacings are composites of steel and tungsten carbide applied by welding techniques. This paper discusses the important variables involved and gives experimental results for casing wear and abrasive wear resistance.
J. S. Williamson, J. Bolton
openaire   +1 more source

Drill string dynamics and experimental study of constant torque and stick-slip reduction drilling tool

Petroleum science and technology, 2022
Aiming at the problems of large torque fluctuation of drill bit and low weight-on-bit(WOB) transmission efficiency during the drilling process, a novel drilling tool generating constant torque and reducing stick-slip is proposed.
Jialin Tian, Lei Tang, Yinglin Yang, L. Dai, Changqing Xiong   +4 more
semanticscholar   +1 more source

Experimental Evaluations of Drill Bit and Drill String Dynamics

Proceedings of SPE Annual Technical Conference and Exhibition, 1994
Abstract Laboratory and field experiments were performed to investigate the dynamics of the drill bit and drill string. Laboratory results for Anti-whirl and conventional polycrystalline diamond compact (PDC) bits showed that vibrations of the former were an order of magnitude less than those of the latter.
M.W. Dykstra, D.C.-K. Chen, T.M. Warren
openaire   +2 more sources

Effects of Drill String Length on Stick–Slip Oscillation of the Oilwell Drill String

Iranian Journal of Science and Technology, Transactions of Mechanical Engineering, 2019
It has been demonstrated by numerous field data that the stick–slip phenomenon tends to appear in deep wells. However, the explanation for this phenomenon has scarcely been studied. Based on a torsional pendulum model, the relationship between stick–slip oscillation and drill string (DS) length is studied in this work.
Liping Tang, Xiaohua Zhu
openaire   +1 more source

Minimizing Drill-String-Induced Wellbore Instability

Middle East Oil, Gas and Geosciences Show, 2023
Abstract Objective/Scope Every year the petroleum industry spends more than an estimated $6 billion in mitigating wellbore instabilities that account for nearly half of the drilling-related NPT (non-productive time). Researchers believe wellbore instability problems occur primarily due to physical and
Soukat Kumar Das, Hussain Albahrani, Arpita Pal Bathija, Thomas Finkbeiner   +3 more
openaire   +1 more source

Designing and Qualifying Drill Strings for Extended Reach Drilling

SPE Drilling & Completion, 1996
Summary Extended reach (ER) drill string design involves selecting from a variety of available drill string components, those best suited to drill an ER well. In a typical ER well, torsion loads will be higher and tension loads will be lower than for a vertical well of the same measured depth.
T.H. Hill, G.J. Guild, M.A. Summers
openaire   +1 more source

Drill String Failures: Inevitable or Not?

Day 1 Tue, March 05, 2024
The past few years have seen many experienced drilling operations personnel retire. Coincidently, the industry saw an increase in the number of drillstring failures, some of which could have potentially been avoided.
G. Plessis, D. Morgan, D. Meinders, C. Wade   +3 more
semanticscholar   +1 more source

An event-triggered approach to torsional vibration control of drill-string system using measurement-while-drilling data

, 2021
Suppressing torsional vibration of drill-string has great safety and economic importance to drilling process. Note that most existing control methods only measure surface information, their performance are limited, especially for a long drill-string.
Chengda Lu, Min Wu, Luefeng Chen, Weihua Cao   +3 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

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
openaire   +1 more source