Methods to Estimate the Rock Strength and Tooth Wear While Drilling With Roller-Bits—Part 2: Insert Bits

[+] Author and Article Information
H. Karasawa, T. Ohno, 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 124(3), 133-140 (Aug 06, 2002) (8 pages) doi:10.1115/1.1482406 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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Insert bits of 101.6-mm (4-in) diameter (from left: T0, T2, T4)
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(a) u/N-F/d plot for Sori granite (A); (b) u/N-8T/d2 plot for Sori granite (A); (c) 8T/d2-F/d plot for Sori granite (A) and Kimachi sandstone (A) in case of T0 bit
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(a) Effect of bearing wear on u/N-F/d plot; (b) effect of bearing wear on u/N-8T/d2 plot
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(8Te/d2)2-Fcu/Nd plot for each rock type
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Relationship between Sc and Ds
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(a) Relationship between Ds and Is for T0, T2, and T4 bits; (b) relationship between Ds and Sc for T0, T2 and T4 bits
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Relationship between Ds and Fc/d for T0, T2, and T4 bits
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(a) Relationship between wear reduction ratio of tooth height (TW) and dimensionless effective torque (Ted) for insert bits; (b) relationship between TW and Ted for milled-tooth bits
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Effect of bit-balling on 8T/d2-F/d plot (milled-tooth bits)




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