The influence of shock absorber on down-hole drilling tools’ vibration characteristics

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (17) : 128-132.

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The influence of shock absorber on down-hole drilling tools’ vibration characteristics

Zhu Xiao-hua Hu Zhi-qiang

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Abstract

Down-hole drilling tools’ vibration is not surely reduced significantly and fracture accidents still occur occasionally after the use of shock absorber. Based on the virtual work principle and numerical simulation method, and then, according to kinematics law and mechanical property of the roller cone bit, the influence of shock absorber on down-hole drilling tools’ vibration characteristics is analyzed. Firstly, the law of influence of longitudinal shock absorber’s characteristic parameters (stiffness, installation site and damping) on down-hole drilling tools’ axial vibration is obtained; then, the optimum damping of the longitudinal shock absorber with different stiffness is provided; and also, the fact that longitudinal shock absorber has the same effects on torsion vibration as on axial vibration, while torsion shock absorber intensifies the bit vibration is discovered; finally, the suggestion that the vibrations of drilling string and bit should be considered as the rotary speed in the selections of shock absorber’s optimum characteristic parameters is given. The research provides the scientific basic for the use and optimization of shock absorber.

Key words

Drilling tools vibration / Shock absorber / Stiffness / Installation site / Damping / Rotary speed

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Zhu Xiao-hua Hu Zhi-qiang. The influence of shock absorber on down-hole drilling tools’ vibration characteristics[J]. Journal of Vibration and Shock, 2013, 32(17): 128-132