Analysis of operation of a drill string bottom assembly when drilling with a turbo-drill motor under resonance conditions
UDC: 622.24.084.3+534.1
DOI: 10.33285/1999-6934-2023-4(136)-34-40
Authors:
SUNTSOV VALERY V.
1,
ZAIKIN STANISLAV F.1,
BLINKOV OLEG G.2
1 Ukhta State Technical University, Ukhta, Russia
2 Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
Keywords: drilling, bottom-hole assembly, turbo-drill motor, blades, standing waves, resonance
Annotation:
The authors of the article analyze the operation of a drill string bottom assembly in conditions of resonance when it is scrolled by a turbine in case of the formation and propagation of longitudinal and torsional vibrations in it on a wave-like bottom. The method, applied for calculation of a drill bit trajectory and the description of the dynamics of the bottom-hole behavior trajectory during drilling in case of resonance, is described in detail in the [1, 5, 9]. Theoretical calculations made with the help of this technique were confirmed during the study of the bottom-hole resonance when drilling well No 500 of the "Orenburgneft" association in the Buzuluksky Drilling Directorate at the Bobrovsky field. Thanks to the experiment, it was revealed that in case of the bottom-hole assembly resonance, the length of the bottom-hole assembly, but not the blades design, is of decisive value. The vibration parameters of the turbo-drill motor are formed as distributed ones, externally concentrated on the lower stage of the turbo-drill motor, not depending on the turbo-drill motor length. Fluctuations of the bottom-hole assembly with the greatest amplitude occur when the turbo-drill is operating in the middle of its torque characteristic.
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