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Theoretical Modeling and Experimental Study of the Whirling Motion of Casing Drilling

  • Yinping Cao
  • Stefan Miska
  • Yihua Dou
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

In casing drilling, with the increase in rotary speed, the motion pattern of casing will transform from rotating about its own axis to wobbling and subsequently even to whirling. Energy method was adopted to calculate the critical whirling speed of casing for both pinned-pinned and fixed-fixed supports. Experiments were conducted under a realistic wellbore–casing configuration on a unique experimental setup located at the University of Tulsa. With the advantage of the transparent wellbore, observational tests were conducted to see the motion pattern of casing under different cases. For the first time, the orbital motion of casing was observed, which can be used to give a better understanding of smearing effect of casing drilling. The mathematical modeling and experimental results are very useful for casing size selection and rotary speed control.

Keywords

Whirling motion Casing drilling Critical whirling speed Energy method 

Nomenclature

L

Length of the casing between the two supports

Ub

Strain energy of bending

W1

Done by the external thrust force

W2

Done by the centrifugal force

EI

Bending stiffness of casing

\( \omega \)

Rotary speed of casing

P

Thrust force

H0

Reaction force at the support point

p

Weight per unit length

Lt

Length between support point and contact point

C

Clearance between casing and wellbore

Notes

Acknowledgements

The paper is supported by Chinese National Natural Science Foundation (51404198) and Natural Science Foundation of Shaanxi Province, China (2014JQ7289). The authors are thankful to the University of Tulsa Drilling Research Projects for the technical and facility supports.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Xi’an Shiyou UniversityXi’anChina
  2. 2.The University of TulsaTulsaUSA

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