Vibration analysis of new drill string system with hydro-oscillator in horizontal well

다국어 초록 (Multilingual Abstract)

With the growth of oil and gas resource demand, the hydro-oscillator is widely used to enhance the Rate of penetration (ROP) and improve the efficacy in drilling various wells. The vibration model is the key issue of dynamics analysis and optimization of downhole tools.

For the vibration analysis of the new drill string system with hydro-oscillator in the horizontal well, based on the design of the new hydro-oscillator and its operation conditions, the kinematics expressions are presented. Combined with the vibration force calculation results of the hydro-oscillator, the dynamics model of the new drill string system is established. Furthermore, the important features of vibration frequency, displacement, velocity and acceleration are discussed in the numerical example calculation results. By comparing the results of the calculation and experiment test, we can verify the correctness of the analysis model. With the hydro-oscillator vibration effect, the static friction between the drill string and wellbore is changed to the dynamic friction, so it can result in a significant increase in run length. At the same time, the ROP can be enhanced with the vibration effect. Moreover, with the parameters’ adjustment according to the operation conditions, the analysis method and model can also provide references to the study of similar downhole tools dynamics or mechanical properties.

참고문헌 (Reference)

1 H. Storck, "The effect of friction reduction in presence of ultrasonic vibrations and its relevance to travelling wave ultrasonic motors" 40 (40): 379-383, 2002

2 D. Xuecheng, "Study on running characteristic of oscillation impacter for oil-drilling" 50 (50): 197-205, 2014

3 S. Tarasov, "Study of friction reduction by nanocopper additives to motor oil" 252 (252): 63-69, 2002

4 J. Pyecroft, "Second generation testing of cased uncemented multi-fractured horizontal well technology in the Horn River" SPE 2014

5 Jia-lin Tian, "Rock-breaking analysis model of new drill bit with tornado-like bottomhole model" 대한기계학회 29 (29): 1745-1752, 2015

6 A. A. Bond, "Reliable technology for drilling operations in a high-pressure/high-temperature environment" SPE 2014

7 V. C. Kumar, "Reduction of the sliding friction of metals by the application of longitudinal or transverse ultrasonic vibration" 37 (37): 833-840, 2004

8 J. A. González, "Partitioned vibration analysis of internal fluid-structure interaction problems" 92 (92): 268-300, 2012

9 D. Xuecheng, "Numerical simulation analysis of rock breaking mechanism for oscillation impacter" 36 (36): 160-167, 2014

10 A. S. Yigit, "Modeling and analysis of axial and torsional vibration of drillstrings with drag bits" SPE 2014

11 X. Hao, "Hydraulic oscillators in a new gas field Shinsa 21-28H well applications" 33 (33): 64-67, 2013

12 G. Huagao, "Effects of friction on post-buckling behavior and axial load transfer in a horizontal well" 15 (15): 1104-1118, 2012

13 Masato Okada, "Cutting characteristics of twist drill having cutting edges for drilling and reaming" 대한기계학회 28 (28): 1951-1959, 2014

14 L. P. Skyles, "Converting static friction to kinetic friction to drill further and faster in directional holes" SPE 2012

15 R. Gee, "Axial oscillation tools vs. lateral vibration tools for friction reduction – What's the best way to shake the pipe" SPE 2015

16 T. Richard, "A simplified model to explore the root cause of stick–slip vibration drilling systems with drag bits" 305 : 432-456, 2007

17 H. Zhang, "A novel tool to improve rate of penetrationdown-hole drilling string absorption & hydraulic supercharging device" SPE 2015

18 P. Wang, "A modified model for friction reduction by vibrating drill-string longitudinally" 535 : 597-601, 2014