Analysis of Torsional Impact Improving Working Conditions of PDC Bits in Hard Rock Formations

Hong Bo Wang; Long Chen Duan; Shang Wen Shu; Qi Yu Sun

doi:10.4028/www.scientific.net/AMM.271-272.412

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 271-272Analysis of Torsional Impact Improving Working...

Analysis of Torsional Impact Improving Working Conditions of PDC Bits in Hard Rock Formations

Abstract:

Life and ROP of PDC bits are improved greatly when rotational impact drill assemblies (TorkBuster) are used in hard rock formations. The transient drilling processes of PDC bits combined with and without TorkBuster are simulated based on ANSYS software when drilling in densify sandstone formations. Simulated results are compared. It’s found that the torsion angle of the drill pipe is lessened greatly when torsional impact is loaded with same bit pressure and torque as that without torsional impact. Torsional impact reduces accumulated energy stored in the drill pipe, relieves stick-slip vibration and improves working conditions of PDC bits greatly.

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Periodical:

Applied Mechanics and Materials (Volumes 271-272)

Pages:

412-416

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.271-272.412

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Online since:

December 2012

Authors:

Hong Bo Wang, Long Chen Duan, Shang Wen Shu, Qi Yu Sun

Keywords:

ANSYS Software, Stick-Slip Vibration, Torsion Angle, Torsional Impact, Working Condition

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