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TECHNICAL PAPERS

Methods to Estimate the Rock Strength and Tooth Wear While Drilling With Roller-Bits—Part 1: Milled-Tooth Bits

[+] Author and Article Information
H. Karasawa, T. Ohno, M. Kosugi

National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan

J. C. Rowley

Pajarito Enterprises Consulting Services Inc., Los Alamos, NM 87544

J. Energy Resour. Technol 124(3), 125-132 (Aug 06, 2002) (8 pages) doi:10.1115/1.1482405 History: Received October 20, 1997; Revised April 09, 2002; Online August 06, 2002
Copyright © 2002 by ASME
Topics: Wear , Drilling , Rocks , Rollers
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References

Figures

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(a) Effect of tooth wear on threshold weight per unit length of bit diameter (Fc/d); (b) effect of tooth wear on threshold energy per revolution divided by cross-sectional area of bit (8Tc/d2)
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(a) Effect of tooth wear on penetration strength of rock (Is); (b) effect of tooth wear on specific energy calculated from effective rotary energy (Se)
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Relationship between uniaxial compressive strength of rock (Sc) and drillability strength of rock (Ds)
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(a) Relationship between effective axial energy per revolution divided by bit diameter (Feu/Nd) and effective rotary energy per revolution divided by cross-sectional area of bit squared ((8Te/d2)2) at 50 rpm; (b) (8Te/d2)2-Feu/Nd plot at 100 rpm
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(a) u/N-F/d plot for Shinkomatsu andesite at 50 rpm; (b) u/N-8T/d2 plot for Shinkomatsu andesite at 50 rpm
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(a) Relationship between bit weight per unit length of bit diameter (F/d) and penetration per revolution (u/N) for Kimachi sandstone at 50 rpm; (b) relationship between rotary energy per revolution divided by cross-sectional area of bit (8T/d2) and u/N for Kimachi sandstone at 50 rpm
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Drilling machine used for the tests
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Milled-tooth bits of 98.43-mm (3-7/8-in) diameter (from left: T7, T4, T0)

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