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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Karasawa,  H., Ohno,  T., and Kosugi,  M., 1996, “Applicability of Methods for Estimation of Rock Strength and Tooth Wear to Insert Bits” (in Japanese), J. Mining and Materials Processing Institute of Japan, 112, pp. 688–694.
Warren,  T. M., 1984, “Factors Affecting Torque for a Roller Cone Bit,” J. Pet. Technol., 36, pp. 1500–1508.
Pessier, R. C., and Fear, M. J., 1992, “Quantifying Common Drilling Problems With Mechanical Specific Energy and a Bit-Specific Coefficient of Sliding Friction,” SPE 24584, presented at 67th Annual Technical Conference and Exhibition of the SPE, Washington, DC, October 4–7, pp. 373–388.
Bingham,  M. G., 1964, “What You Should Know About Bit Design and Performance,” Oil & Gas Journal, 62, No. 47, pp. 77–78.62, No. 47, pp. 80.62, No. 47, pp. 82.62, No. 47, pp. 85.62, No. 47, pp. 88–89.
Maurer,  W. C., 1962, “The “Perfect-Cleaning” Theory of Rotary Drilling,” J. Pet. Technol., 14, pp. 1270–1274.
Warren,  T. M., 1981, “Drilling Model for Soft-Formation Bits,” J. Pet. Technol., 33, pp. 963–969.
Burgess, T. M., and Lesso Jr., W. G., 1985, “Measuring the Wear of Milled Tooth Bits Using MWD Torque and Weight-on-Bit,” SPE/IADC 13475, presented at the SPE/IADC 1985 Drilling Conference, New Orleans, LA, March 6–8, pp. 453–462.
Wolcott, D. S., and Bordelon, D. R., 1993, “Lithology Determination Using Downhole Bit Mechanics Data,” SPE 26492, presented at the 68th ATCE of the SPE, Houston, TX, October 3–6, pp. 769–778.
Detournay,  E., and Defourny,  P., 1992, “A Phenomenological Model for the Drilling Action of Drag Bits,” Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 29, No. 1, pp. 13–23.


Grahic Jump Location
(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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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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