Volume 8, Issue 6, November 2020, Page: 157-166
Drillstring Buckling Prediction and Its Impact on Tool-Joint Effects in Extended Reach Wells
Anthony Kerunwa, Department of Petroleum Engineering, Federal University of Technology, Owerri, Nigeria
Received: Dec. 7, 2020;       Accepted: Dec. 28, 2020;       Published: Jan. 4, 2021
DOI: 10.11648/j.ogce.20200806.16      View  18      Downloads  22
The mechanism of buckling has been extensively studied in pipes and tubings. But these studies more often has been restricted to continuous or straight body pipes. In reality most pipes and other drillstring elements have end couplings or connections known as tool joint. Tool joint presence changes the annular geometry, hydraulics and stress distribution of the pipe or tubulars in the wellbore. Modelling drillstring in highly deviated wells with no regards to the tool joint effects has been a major source of error in many drilling mechanics analysis. This has often led to misleading information on buckling and bending of the pipe which could lead to drilling and completion problems and costly well interventions. Thus it becomes necessary to model tool joint effect in the drillstring as it is subjected to downhole forces and stresses. In this study, emphasis is made on the determination of tool joint effect on pipe buckling for highly deviated extended reach wells (ERWs). WellPlan T&D spreadsheet software was used for the simulation. The simulation was runned for pipe with tool joint and the same pipe with the tool joints removed. Results show that jointed pipes has similar buckling behaviour with continuous straight body pipes with buckling starting from sinusoidal buckling mode and gradually entering the helical buckling mode for both types of pipes. Furthermore, result revealed that tool joint presence increases the critical buckling force by an average of 28.9% for helical as well as (AWA) sinusoidal buckling modes.
Wellbore, Tubular, Modelling, Trajectories, Helical, Sinusoidal
To cite this article
Anthony Kerunwa, Drillstring Buckling Prediction and Its Impact on Tool-Joint Effects in Extended Reach Wells, International Journal of Oil, Gas and Coal Engineering. Vol. 8, No. 6, 2020, pp. 157-166. doi: 10.11648/j.ogce.20200806.16
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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