Stick-slip vibration is commonplace in the drilling of polycrystalline diamond compact (PDC) bit, which leads to early bit failure, low drilling efficiency and high drilling cost. Inspired by the application of torsional impactor, this paper establishes a nonlinear dynamic 3D numerical simulation model, in which the Drucker-Prager criterion is taken as the yield criterion of the rock. Then, the model was applied to simulate the dynamic rock-breaking process of the PDC bit under circumferential torque impactor. The results show that the stick-slip vibration was basically eliminated under the torque impactor, and the rate of penetration (ROP) increased by three times. This means the application of circumferential torque impactor to PDC bit can reduce the stick-slip vibration and enhance the ROP. The research findings provide a theoretical guidance on the application of torsional impactor on PDC bit
torsional impactor, polycrystalline diamond compact (PDC) bit, stick-slip vibration, rock-breaking simulation
Project supported by PetroChina Innovation Foundation (Grant No. 2015D-5006-0310)
Brett J. F. (1992). The genesis of torsional drillstring vibrations. SPE Drilling Engineering, Vol. 7, No. 3, pp. 168–174. https://doi.org/10.2118/21943-PA
Challamel N. (2000). Rock destruction effect on the stability of a drilling structure. Journal of Sound and Vibration, Vol. 233, No. 2, pp. 235-254. https://doi.org/10.1006/jsvi.1999.2811
Deen C., Wedel R., Nayan A., Mathison S., Hightower G. (2011). Application of a torsional impact hammer to improve drilling efficiency. Proceedings of the SPE Annual Technical Conference and Exhibition, SPE. https://doi.org/10.2118/147193-MS
Li H. (2014). Numerical simulation of rock breaking of PDC cutting teeth under torsional impact. Southwest Petroleum University.
Li M. Q., Cao Y., Wang Q. J., Li N., Huang T. C. (2015). Dynamics of circumferential torque hydraulic shock generator. China Petroleum Machinery, Vol. 43, No. 11, pp. 44-47. https://doi.org/10.16082/j.cnki.issn.1001-4578.2015.11.009
Lu L. L., He D. S., Zhang W. D. (2015). Research and application prospect of torsional impact hammer. Oil Field Equipment, pp. 82-85, 2015. https://doi.org/10.3969/j.issn.1001-3842.2015.06.019
Martins J. A. C., Oden J. T., Simo F. M. F. (1990). A study of static and kinetic friction. International Journal of Engineering Science, Vol. 28, No.1, pp. 29-92. https://doi.org/10.1016/0020-7225(90)90014-A
Palmov V. A., Brommundt E.,. Belyaev A. K. (1995). Stability analysis of drillstring rotation. Dynamics and Stability of Systems, Vol. 10, No. 2, pp. 99-110. https://doi.org/10.1080/02681119508806197
Richard T., Detournay E. (2000). Stick-slip motion in a friction oscillator with normal and tangential mode coupling. Compte Rendus del’Acade´mie des Sciences, Vol. 328, No. 9, pp. 671-678. https://doi.org/10.1016/S1620-7742(00)01240-X
Sun Y. H. (2010). Modeling and numerical simulation of fractured low permeability sandstone reservoir. Tianjin science and technology press.
Tolstoi D. M. (1967). Significance of the normal degree of freedom and natural normal vibrations in contact friction. Wear, Vol. 10, No. 3, pp. 199-213. https://doi.org/10.1016/0043-1648(67)90004-X
Tucker R. W., Wang C. (1999). An integrated model for drill-string dynamics. Journal of Sound and Vibration, Vol. 224, No. 1, pp. 123-165. https://doi.org/10.1006/jsvi.1999.2169
Twozydlo W. W., Becker E. B., Oden J. T. (1994). Numerical modeling of friction-induced vibrations and dynamic instabilities. Applied Mechanics Reviews, Vol. 47, No. 7, pp. 255–274. https://doi.org/10.1115/1.3111081
Xu Y. K. (2015). The rock-breaking mechanism and experimental study of PDC bits under torsional impact. Northeast Petroleum University.
Yang X. L., Song J. W., He S. M., Yu X. L. (2014). Evaluation of parameters for torsional impact to break rock. Oil Field Equipment, No. 9, pp. 4-8. https://doi.org/10.3969/j.issn.1001-3482.2014.09.002
Zhang H. W., Ma Y. J. (2012). Analysis and study on application of torkbuster torsional impactor. Liaoning Chemical Industry, pp. 841-843. https://doi.org/10.3969/j.issn.1004-0935.2012.08.031
Zhu X. H., Tang L. P., Tong H. (2012). Rock breaking mechanism of a high frequency torsional impact drilling. Journal of Vibration and Shock, pp. 75-78. https://doi.org/10.3969/j.issn.1000-3835.2012.20.017