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RESEARCH PAPERS

Stick-Slip and Bit-Bounce Interaction in Oil-Well Drillstrings

[+] Author and Article Information
Ahmet S. Yigit

Department of Mechanical Engineering, Kuwait University, P.O. Box 5969, Safat 13060, Kuwaityigit@kuc01.kuniv.edu.kw

Andreas P. Christoforou

Department of Mechanical Engineering, Kuwait University, P.O. Box 5969, Safat 13060, Kuwaityigit@kuc01.kuniv.edu.kw

J. Energy Resour. Technol 128(4), 268-274 (Feb 19, 2006) (7 pages) doi:10.1115/1.2358141 History: Received June 05, 2005; Revised February 19, 2006

Drillstring vibrations and in particular stick-slip and bit-bounce are detrimental to oil-well drilling operations. Controlling these vibrations is essential because they may cause equipment failures and damage to the oil-well. A simple model that adequately captures the dynamics is used to simulate the effects of varying operating conditions on stick-slip and bit-bounce interactions. It is shown that the conditions at the bit/formation interface, such as bit speed and formation stiffness, are major factors in shaping the dynamic response. Due to the varying and uncertain nature of these conditions, simple operational guidelines or active rotary table control strategies are not sufficient to eliminate both stick-slip and bit-bounce. It is demonstrated that an additional active controller for the axial motion can be effective in suppressing both stick-slip and bit-bounce. It is anticipated that if the proposed approach is implemented, smooth drilling will be possible for a wide range of conditions.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Sketch of the system

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Figure 2

Frictional behavior between the bit and the formation

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Figure 3

Stick-slip vibrations without bit-bounce

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Figure 4

Stick-slip vibrations eliminated by increasing the desired table speed

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Figure 5

Stick-slip vibrations with bit-bounce

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Figure 6

Bit-bounce without stick-slip vibrations

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Figure 7

Rotary table control eliminating bit-bounce and stick-slip vibrations

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Figure 8

Rotary table control unable to eliminate bit-bounce on a soft formation

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Figure 9

Axial and rotary table control eliminating stick-slip and bit-bounce

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