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Abstract
he research results are obtained without any support in the form of grants or projects. The authors express their gratitude to the Academician of the National Academy of Sciences of Ukraine, Professor Ye.I. Kryzhanivskyi for his specialized consultations and discussions of the research result.
Highlights
Studies of the fatigue crack growth may be the basis to develop measures aimed at reducing stresses effecting the drill string and minimizing washout formations; that will help prolong the drill pipe life
We have studied the growth kinetics of that fatigue crack
Analysis of the results shows that in terms of the specified operating modes, the crack does not reach critical dimensions, and the pipe may operate within the well for some time more
Summary
Practice of drilling oil and gas wells shows that fatigue and corrosive-fatigue damages are the most often reasons for the failures of drill string elements (MacDonald, 1994; Dzheyson, Reynol’ds, Ellis, & Styuart, 2004; Artym, Yatsynyak, Hrytsiv, Yurych, & Rachkevych, 2012; Zamani, Hassanzadeh-Tabrizi, & Sharifi, 2016). The mentioned period demonstrates 75 failure cases in terms of pipe body and 2 failures in terms of threaded joints. Main reasons of the first failure type are as follows: formation of micro-cracks with their further erosion and fatiguerelated complete breaking (44 cases); fatigue breaking due to the effect of considerable sign-reversing loads (19 cases). Other accidents occurred due to the nonobservance of technological processes during trips and as a result of bit overloading or jamming
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