Drilling assembly with reduced stick-slip tendency

Details Drilling assembly with reduced stick-slip tendency Drilling assembly with reduced stick-slip tendency

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2281847

A system (1) for drilling a borehole in an earth formation is disclosed, the system (1) comprising a first sub-system (I) including a drill string (3) extending into the borehole, and a second sub-system (II) including a drive system for driving the drill string (3) in rotation about the longitudinal axis thereof. Each one of said sub-systems has a rotational resonance frequency, wherein the rotational resonance frequency of the second sub-system (II) is lower than the rotational resonance frequency of the first sub-system (I).

L'invention concerne un système (1) pour forer un trou de forage dans une formation en terre comprenant un premier sous-système (I) incluant un train de tiges (3) s'étendant dans le trou de forage et un second sous-système (II) comportant un système d'entraînement pour entraîner le train de tiges (3) en rotation autour de son axe longitudinal. Chacun de ces sous-systèmes a une fréquence de résonance rotatoire, la fréquence de résonance rotatoire du second sous-système (II) étant inférieure à la fréquence de résonance rotatoire du premier sous-système (I).

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