Analysis of the Influences of Drilling Fluid Flow Velocity inside and outside the Drilling String on Drilling String Lateral Vibration Frequency

Abstract:

Drilling string lateral vibration is a severe damage,which is influenced by many complex factors. This paper makes a theoretical analysis of the drilling string lateral vibration frequency caused by drilling fluid flow velocity inside and outside the drilling string, which supplies some evidence for calculating rotation speed of rotary table and reduces the times of drill string resonance. The influence of drilling fluid flow velocity inside the drilling string on lateral vibration frequency is analyzed by Euler method. Besides,through the use of mechanical analysis method and the introduction of additional mass coefficient. A differential equation of drilling string lateral vibration with the consideration of drilling fluid flow velocity inside and outside the drilling string is built up, and a mathematical model of drilling string lateral vibration under the influence of drilling fluid flow velocity is obtained. Field applications indicate that this model is in agreement with the field condition. Key words: mass coefficient;differential equation; drilling fluid flow velocity; lateral vibration frequency;

• Periodical: Advanced Materials Research (Volumes 821-822)
• Pages: 1418-1421
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.821-822.1418
• Online since: September 2013
• Authors: Tie Yan, Li Wang, Xiao Feng Sun, Jun Bo Qu
• Keywords: Differential Equation, Drilling Fluid Flow Velocity, Lateral Vibration Frequency, Mass Coefficient

References

[1] Su Hua, Zhang Xuehong, Wang Gongyuan. Development of drillstring mechanics: drillstring statics[J], Journal of daqing petroleum institute 1994, 18(1) P 43-50, in China.

[2] Su Hua, Zhang Xuehong, Wang Gongyuan. Development of drillstring mechanics: drillstring dynamics [J], Journal of Daqing Petroleum institute 1994, 18(3) P 45-50, in China.

[3] Han Chunjie, Yan Tie. Rules and their application of drilling string lateral vibration. Journal of Daqing Petroleum institute2004, 28(1) P14-16, in China.

[4] Dykstra M W．Nonlierar drill string dynamics[D] Tulsa: The University of Tulsa, 1996, in China.

[5] Wang Yingzhen. Effects of the flowing drill fluid on lateral vibration and stability of the drill system[J]. China petroleum machinery1990, 18(1) P 32-35, in China.