Abnormal down hole pressure variation by axial stick-slip of drillstring

Abnormal down hole pressure variation by axial stick-slip of drillstring Downhole pressure variation is generally believed to be a kind of surge and swab pressure due to the axial movement of drillstring during the tripping in/out operation, and even wave loading induced heave motion. In order to predict downhole pressure variation, the Stribeck friction model has been used to analyze the friction-induced self-excitation vibration (stick-slip). This model describes the axial stick-slip motion of the drill pipe through four regimes of contact: sticking, boundary lubrication, partial fluid lubrication, and full lubrication. The results indicate a significant increase in the peak velocity of the drillstring compared to the velocity at the surface point. In addition, axial tension induced geometrical stiffness has been taken into account, which results in a time dependent normal force between the drillstring and the borehole in the curved section of borehole. Simulations show that the wave form of the downhole drillstring motion is different from the surface motion. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Petroleum Science and Engineering Elsevier

Abnormal down hole pressure variation by axial stick-slip of drillstring

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier B.V.
ISSN
0920-4105
eISSN
1873-4715
D.O.I.
10.1016/j.petrol.2016.04.004
Publisher site
See Article on Publisher Site

Abstract

Downhole pressure variation is generally believed to be a kind of surge and swab pressure due to the axial movement of drillstring during the tripping in/out operation, and even wave loading induced heave motion. In order to predict downhole pressure variation, the Stribeck friction model has been used to analyze the friction-induced self-excitation vibration (stick-slip). This model describes the axial stick-slip motion of the drill pipe through four regimes of contact: sticking, boundary lubrication, partial fluid lubrication, and full lubrication. The results indicate a significant increase in the peak velocity of the drillstring compared to the velocity at the surface point. In addition, axial tension induced geometrical stiffness has been taken into account, which results in a time dependent normal force between the drillstring and the borehole in the curved section of borehole. Simulations show that the wave form of the downhole drillstring motion is different from the surface motion.

Journal

Journal of Petroleum Science and EngineeringElsevier

Published: Sep 1, 2016

References

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