TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Free Flexional Oscillations of the Large Diameter Drill String and 10¾" Drill Pipe Breaking
(Oscilaţiile flexionale, libere, ale garniturii de foraj de diametru mare şi ruperea prăjinilor de foraj de 10¾")
Vol LXV • No. 4/2013
Simion Parepa
Universitatea Petrol - Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: sparepa@upg-ploiesti.ro

 Keywords   drill pipe breaking, free flexional oscillations

 Abstract
At the time of drilling of the large diameter wells with 10¾" drill string, fatigue cracks and breaks of the drill pipes have been found. The records performed at the time of drilling have pointed out that higher amplitudes of the bending and torsion stresses appear in certain conditions of work: depth, rotation and weight on bit. Really, the study of the free flexional oscillations in case of 10¾" drill string included in this work shows that the drill pipes placed in the lower third of the drill string are liable to higher loadings in resonance conditions.

 Rezumat
Īn timpul forajului puţurilor de diametru mare, cu garnitura de foraj de 10¾", s-au constatat fisurări şi ruperi de oboseală ale prăjinilor de foraj. Īnregistrările efectuate īn timpul forajului au evidenţiat faptul că apar amplitudini mai mari ale tensiunilor de īncovoiere şi de torsiune īn anumite condiţii de lucru: adāncime şi regim de lucru (turaţie şi forţă de apăsare pe sapă). Īntr-adevăr, studiul oscilaţiilor flexionale libere ale garniturii de 10¾", īntreprins īn această lucrare, arată că prăjinile amplasate īn treimea inferioară a garniturii sunt predispuse unor solicitări mai mari, īn condiţii de rezonanţă. Astfel, rezultatele calculului din această lucrare sunt īn concordanţă cu fenomenele reale manifestate īn practica forajului de diametru mare, cu instalaţia de foraj F320-3DH-M.



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