Drillstring Failure - Identification, Modeling and Experimental Characterization

[+] Author and Article Information
Jamil Abdo

Department of Physics and Engineering, Frostburg State University, Frostburg, MD, USA

Edris M. Hassan

Department of Mechanical and Industrial Engineering, Sultan Qaboos University, Muscat, Oman

Khaled Boulbrachene

Department of Chemistry and Earth Sciences, Qatar University, Doha, Qatar

Jan Kwak

Department of Chemistry and Earth Sciences, Qatar University, Doha, Qatar

1Corresponding author.

ASME doi:10.1115/1.4041638 History: Received April 21, 2018; Revised September 27, 2018


Drilling is one of the most costly and risky activities in oil and gas industry due to complexity of interactions with downhole formation. Under such conditions, the risk and uncertainty of drill string behavior increase and hence it becomes difficult to predict the causes, occurrences, and types of failures. Lateral and torsional vibrations often cause failure of Bottom Hole Assembly (BHA), drill string failure, drill bit and wall borehole damages. In this paper, a model is presented to determine the impact of lateral and torsional vibrations on a drill string during the drilling operation. The model aims to mimic real drill string behavior inside a wellbore with regards to its dynamic movements. The work aims to develop a basis for determining critical operating speeds and design parameters to provide safe drilling procedures and reduce drill string fatigue failure. Lagrangian approach is used in this study to attain drill string lateral and torsional vibration coupling equations. In this work, we also present a brief description of an in-house constructed experimental setup. The setup has the capability to imitate the downhole lateral and torsional vibration modes. Parameters from the experimental investigations are incorporated for validation of the mathematical models and for prediction of the drill string fatigue life. Such investigations are essential for oil/gas industries as they provide solutions as well as recommendations about operating speed, lateral and torsional amplitudes measurements and corrections, and the conditions for avoiding occurrence of natural frequency(ies) of the system.

Copyright (c) 2018 by ASME
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