Hole cleaning for the majority of vertical and directional drilling wells continues to be a substantial difficulty despite improvements in fluids, equipment, field techniques, academic industrial research. Poor hole might cause issues such as stuck pipe incidents, cuttings accumulation, torque drag, erratic equivalent circulating density annulus, wellbore instability, tight spots, condition iss...

K e y w o r d s F o u r t h g r a d e fluid, Unsteady flow, Lie symmetries. 1. I N T R O D U C T I O N In recent years, considerable efforts have been usefully devoted to the s tudy of flow of nonNewton ian fluids. This is ma in ly due to their m a n y appl icat ions in pe t ro leum drilling, manufactu r ing of food and paper, and other similar activities. A vast a m o u n t of l i te ra ture i...

This paper examines the diverse nature of user reactions to information technology (IT) within the social-historical context of its organizational use. Employing activity theory as a conceptual framework, we conduct an interpretive analysis of physicians work, perceptions, and IT usage experience at a large community hospital to understand why some of these physicians were favorably disposed to...

In this paper, we consider the axial motion of a directional multi-sectional drill-string. The drill-string dynamics are represented by distributed dynamical model (wave equations) coupled with an ordinary differential equation at downhole boundary (bit-rock interaction). interaction between drill-bit and rock can introduce severe vibrations in result safety performance issues. Consequently, dr...