Analysis of destruction causes of drill string elements

Authors

  • Василь Михайлович Івасів Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Street, Ivano-Frankivsk, 76019, Ukraine https://orcid.org/0000-0003-4837-1217
  • Ярослав Степанович Гриджук Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Street, Ivano-Frankivsk, 76019, Ukraine https://orcid.org/0000-0002-1429-8640
  • Лідія Романівна Юрич Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Street, Ivano-Frankivsk, 76019, Ukraine https://orcid.org/0000-0002-2435-9785

DOI:

https://doi.org/10.15587/2312-8372.2014.31838

Keywords:

drill string elements, fatigue, fracture, accident analysis

Abstract

The results of published material relating to failures of drill string are shown in the article. It is established that the accidents which occur with drill pipes usually has a fatigue character. The fatigue phenomenon is occurred at alternating bending, torsion collision, fluctuation of the drill string and variable loads. The main factor that causes variable strains and alternating bending is the rotation of the string. The highest percentage of destruction falls on drill pipe fracture in the thickened ends. The main loads occur in screw joints, so screw joint destruction are divided into two groups during exploitation: chipping of some turns and cone fracture of nipple or coupling. The results of this analysis can be used in developed of technical and technological measures to improve the resource and safe operation of the drill string.

Author Biographies

Василь Михайлович Івасів, Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Street, Ivano-Frankivsk, 76019

Doctor of Technical Sciences, Professor

Department of oil and gas equipment

Ярослав Степанович Гриджук, Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Street, Ivano-Frankivsk, 76019

Candidate of Technical Sciences, Associate Professor

Department of theoretical mechanics

Лідія Романівна Юрич, Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Street, Ivano-Frankivsk, 76019

Postgraduate student

Department of oil and gas equipment

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Published

2014-12-23

How to Cite

Івасів, В. М., Гриджук, Я. С., & Юрич, Л. Р. (2014). Analysis of destruction causes of drill string elements. Technology Audit and Production Reserves, 6(4(20), 15–17. https://doi.org/10.15587/2312-8372.2014.31838

Issue

Vol. 6 No. 4(20) (2014): Scientific outcomes 2014

Section

Mechanical Engineering Technology: Original Research

License

Copyright (c) 2016 Василь Михайлович Івасів, Ярослав Степанович Гриджук, Лідія Романівна Юрич

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