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TECHNICAL PAPERS

Proposed Practical Methods to Estimate Rock Strength and Tooth Wear While Drilling With Roller-Cone Bits

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

National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, 305-8569 Japan

J. C. Rowley

Pajarito Enterprises Consulting Services Inc., 3 Jemez Lane, Los Alamos, NM 87544

J. Energy Resour. Technol 126(4), 302-310 (Dec 21, 2004) (9 pages) doi:10.1115/1.1794696 History: Received July 09, 2003; Revised May 01, 2004; Online December 21, 2004
Copyright © 2004 by ASME
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References

Figures

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Roller-cone bits used for drilling tests. From right in front: 3-7/8 in. tooth bits (T7,T4,T0), 7-7/8 in. conical insert bit; from right in rear: 5-5/8 in. tooth bit, 5 in. and 5-5/8 in. insert bits, 7-7/8 in. chisel insert bit.
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Relationship between axial energy per revolution divided by bit diameter (1000Fu/Nd) and rotary energy per revolution divided by cross-sectional area of bit squared (8T/d2)2 for 3-7/8 in. tooth bits at 50 rpm
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(8T/d2)2-1000Fu/Nd plot for 3-7/8 in. tooth bits at 100 rpm
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(8T/d2)2-1000Fu/Nd plot for 5-5/8 in. tooth bit, 5 in. and 5-5/8 in. insert bits
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(8T/d2)2-1000Fu/Nd plot for 7-7/8 in. conical insert bit
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(8T/d2)2-1000Fu/Nd plot for 7-7/8 in. chisel insert bit
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(a) Relationship between bit weight per unit length of bit diameter (F/d) and rotary energy per revolution divided by cross-sectional area of bit (8T/d2) for T0 bit at 50 rpm, (b) 8T/d2-F/d plot for T4 bit at 50 rpm, and (c) 8T/d2-F/d plot for T7 bit at 50 rpm
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8T/d2-F/d plot for 5-5/8 in. tooth bit, 5 in. and 5-5/8 in. insert bits
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8T/d2-F/d plot for 7-7/8 in. conical insert bit  
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8T/d2-F/d plot for 7-7/8 in. chisel insert bit
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Relationship between wear reduction ratio of tooth height TW and dimensionless effective torque Ted for 3-7/8 in. tooth bits  
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Ted-TW plot for 7-7/8 in. chisel insert bit  
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u/N-F/d plot for 3-7/8 in. tooth bits in Ooya tuff drilled at 50 rpm  
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u/N-8T/d2 plot for 3-7/8 in. tooth bits in Kimachi sandstone drilled at 50 rpm
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Fc/d-TW plot for 3-7/8 in. tooth bits drilled in Ooya tuff and Kimachi sandstone

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