One of the most serious concerns of extended-reach drilling is the dynamic behavior of the drillstring and the cleaning of well. Good cleaning requires an increased angular velocity. This paper presents a 3D nonlinear dynamic model of drillstring in a wellbore of 3D profile. The model suggests possible contact/lift-off of drill pipes with/from the wellbore wall. The interaction of lateral, torsional, and axial vibrations is taken into account. The relation between the normal component of contact force and the deformation of the wellbore wall is taken as quadratic-elastic. The friction force is described based on a hysteretic dynamic model. The friction force model also takes into account, the transition from a sliding to whirling. The equations of drillstring dynamics are solved numerically using the method of lines. The DYNTUB software is developed to analyze the drillstring time-varying processes under different loads. The program is used to study the effects of angular velocity, compression load, torque, friction factor, well profile, and availability of connectors on the drillstring dynamic behavior. From the study follows the key conclusions: (1) The friction factor has a considerable effect on the drillstring rotational behavior in the wellbore; (2) no whirling of drillstring at real value of rolling friction factor in a horizontal well in the discussed examples could be seen at all; (3) when whirling takes place, the contact force shows a dramatic times increase; and (4) snaking can be seen in any wells at moderate compressive load and angular velocity.
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e-mail: vadim.tikhonov@eu.weatherford.com
e-mail: safronov@100km.ru
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December 2011
Research Papers
Analysis of Postbuckling Drillstring Vibrations in Rotary Drilling of Extended-Reach Wells
Vadim S. Tikhonov,
Vadim S. Tikhonov
Aquatic Co., a Weatherford Co., Bd. 1, 4/6 3rd Monetchikovsky Pereulok, Moscow 115054,
e-mail: vadim.tikhonov@eu.weatherford.com
Russia
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Alexander I. Safronov
Alexander I. Safronov
Aquatic Co., a Weatherford Co., Bd. 1, 4/6 3rd Monetchikovsky Pereulok, Moscow 115054,
e-mail: safronov@100km.ru
Russia
Search for other works by this author on:
Vadim S. Tikhonov
Aquatic Co., a Weatherford Co., Bd. 1, 4/6 3rd Monetchikovsky Pereulok, Moscow 115054,
Russia
e-mail: vadim.tikhonov@eu.weatherford.com
Alexander I. Safronov
Aquatic Co., a Weatherford Co., Bd. 1, 4/6 3rd Monetchikovsky Pereulok, Moscow 115054,
Russia
e-mail: safronov@100km.ru
J. Energy Resour. Technol. Dec 2011, 133(4): 043102 (8 pages)
Published Online: December 7, 2011
Article history
Received:
March 14, 2010
Revised:
September 9, 2011
Accepted:
September 26, 2011
Online:
December 7, 2011
Published:
December 7, 2011
Citation
Tikhonov, V. S., and Safronov, A. I. (December 7, 2011). "Analysis of Postbuckling Drillstring Vibrations in Rotary Drilling of Extended-Reach Wells." ASME. J. Energy Resour. Technol. December 2011; 133(4): 043102. https://doi.org/10.1115/1.4005241
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