Study on Mechanism of Hammer Bit and Rock Interaction in Geophysical Prospecting Percussion Drilling

Abstract:

Percussion drilling has been widely used in oil and gas industry, yet it still has some shortcomings, such as severe damages to drilling tools, low energy transferring efficiency and low rock-fragmenting efficiency. Thus it is necessary to reveal the mechanism of interactions between the hammer bit and rock in geophysical prospecting percussion drilling. Taking account of the coupling effect of the Weight on Bit (WOB), impact force and rotary torque, this paper constructed a Finite Element Method (FEM) model using the finite element analysis software (ANSYS/LS-DYNA) and conducted a computer simulation of bit-rock interaction under rotating and simple impact effect, which showed the rock-fragmenting process of hammer bit and the curves of volume-time and depth-time of craters as well as the effective stress-time curves of the centre tooth, second-row tooth and peripheral tooth. The results showed that: the percussion drilling process under rotating impact effect is characterized as four fundamental processes; the crater depth mainly depends on impact force rather than rotary torque; the crater created under rotating impact effect is twice the volume of that under impact effect; the effective stress of each tooth changes severely: the stress of second-row tooth is the largest, centre tooth the second, and peripheral tooth the smallest. This study provided a guide for the structural optimization of hammer bit and general applications of percussion drilling.

• Periodical: Advanced Materials Research (Volumes 291-294)
• Pages: 2266-2271
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.291-294.2266
• Online since: July 2011
• Authors: Zhi Qiang Huang, Qin Li, Yong Tao Fan, Zhen Qiang Wei, Hai Yan Zhu
• Keywords: Hammer Bit, Mechanism, Numerical Simulation, Percussion Drilling, Stress

References

[1] C.H. Reinsvold, Smith Intl., J. Clement, etc. Diamond-Enhanced Hammer Bits Reduce Cost per Foot in the Arkoma and Appalachian Basins, in: 1988/ADC/SPE Drilling Conference, Dallas, Texas, February 28-March 2 (1988)

DOI: 10.2118/17185-ms

[2] G.Han, M.S. Bruno. 3D Simulation of Rock Breakage With Air Hammers in Gas-Well Drilling.SPE99522 (2006), p.1

DOI: 10.2118/99522-ms

[3] S. Green, A. Judzis, D. Curry, etc. Single Cutter Impact Tests Investigate Deep-Well Hammer-Drilling Performance, in: the 2005 SPE Annual Technical Conference and Exhibition, Dallas, Texas, U.S.A., ( 2005)

DOI: 10.2118/97173-ms

[4] Hartwan, Howard L.The Simulation of Percussion Dilling in the laboratory By Indexed-Blow Studies, SPE 500-PA

[5] G. Han and M. S. Bruno, in: SPE Gas Technology Symposium, Calgary, Alberta, Canada, (2006)

[6] Luciano E. Chiang and Dante A. Elias: International Journal of Rock Mechanics and Mining Sciences. Vol. 45 (2008), p.701

[7] Guorong Wang, Liu Qingyou. Research on Disc One-cone Bit s Working Performance Simulation. Acta Simulata Systematica Sinica (2004), p.1425 (in Chinese)

[8] Haiyan Zhu, Qingyou Liu, Xiaohua Xiao, and Jiajia Jing. A 3D FEM methodology for the full-scale air hammer bit, teeth and rockcontact analysis.Advanced Materials Research (2011), p.1425

DOI: 10.4028/www.scientific.net/amr.156-157.1425

[9] Zhiqiang Huang, FAN Yong-tao, WEI Zhen-qiang,etc. Simulation study on rock-breaking mechanism of percussion-rotary bit. Journal of Southwest Petroleum University(Science and Technology Edition), 2010, 32(1): 148-150. (in Chinese)

[10] John O. Hallquist. User's Manual for DYNA3D. Lawrence Livermore National Laboratory, (1988)

[11] G. Xiurun, G. Xianrong and F. Dingxiang, in: Proceedings of the fifth international conference on numerical methods in geomechanics, Nagoya University, Nagoya, Japan, vol. 1 (1985), p.229

[12] Fujun Zhao, Li Xibing and Feng Tao. Research on experiments of brittle rock fragmentation. Rock and Soil Mechanics, (2005), pp.1038-1042.

[13] Yizhang He. Techniques of down the hole hammer and its market in China. Rock-soil Drilling Engineering, (2000), 25 (in Chinese).