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research-article

Study on key issues of drag-reduction by axial excitation tools while slide drilling

[+] Author and Article Information
Xueying Wang

Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum, Qingdao 266580, China
1227343776@qq.com

Hongjian Ni

Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum, Qingdao 266580, China
nhj_upc@126.com

Ruihe Wang

School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
2634295059@qq.com

Lei Zhang

Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum, Qingdao 266580, China
sagewwp@sina.com

Peng Wang

Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum, Qingdao 266580, China
b16020048@s.upc.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041155 History: Received December 19, 2017; Revised July 20, 2018

Abstract

Axial excitation tools have the ability to improve slide-drilling efficiency by reducing the friction between the drillstring and the wellbore wall. However, drag-reduction effects are not always satisfactory, and excessive vibration may cause failures of downhole tools in some cases. Thus, a mathematical model was proposed to simulate the vibration responses of a drillstring. In the model, velocity-dependent friction is adopted to calculate the friction-reduction effect. The effect of drillstring joints on the weight on bit was first investigated. The simulation results indicate that the joints intensify the stick-slip motion of the drillstring system. The effect of the location of an axial excitation tool was then studied. The results show that it is better to place an axial excitation tool near the drill bit rather than near the rear of a build section. Because the frictional drag acting on the lower portion of the drillstring dominates the axial stick-slip motion of a drill bit. Finally, the resonance responses were examined in terms of accelerations of the drillstring system. The results show that resonance moderately increases the accelerations of a long horizontal drillstring system in a heavy-damping environment but that the growth of the exciting force can profoundly increase the accelerations.

Copyright (c) 2018 by ASME
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