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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

Karasawa,  H., Ohno,  T., Kosugi,  M., and Rowley,  J. C., 2002, “Methods to Estimate the Rock Strength and Tooth Wear While Drilling With Roller-Bits, Part 1: Milled-Tooth Bits,” ASME J. Energy Resour. Technol., 124, pp. 125–132.
Karasawa,  H., Ohno,  T., Kosugi,  M., and Rowley,  J. C., 2002, “Methods to Estimate the Rock Strength and Tooth Wear While Drilling With Roller-Bits, Part 2: Insert Bits,” ASME J. Energy Resour. Technol., 124, pp. 133–140.
Teale,  R., 1965, “The Concept of Specific Energy in Rock Drilling,” Int. J. Rock Mech. Min. Sci., 2, pp. 57–73.
Hoberock,  L. L., and Bratcher,  G. J., 1996, “A New Approach for Determining In-Situ Rock Strength While Drilling,” ASME J. Energy Resour. Technol., 118, pp. 249–255.
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 ATCE of SPE, Washington, DC, pp. 373–388.
Wolcott, D. S., and Bordelon, D. R., 1993, “Lithology Determination Using Downhole Bit Mechanics Data,” SPE 26492, presented at 68th ATCE of SPE, Houston, pp. 769–778.
Burgess, T. M., and Less, W. G., Jr., 1985, “Measuring the Wear of Milled Tooth Bits Using MWD Torque and Weight-on-Bit,” SPE/IADC 13475, presented at SPE/IADC 1985 Drilling Conference, New Orleans, pp. 453–462.
Karasawa, H., Ohno, T., and Kosugi, M., 2003, “Methods to Evaluate Rock Strength and Tooth Wear in Real Time While Drilling,” Japanese Patent Application No. 2003-165886.
Bingham,  M. G., 1964, “How to Locate Performance Line When Drilling Response Is Low,” Oil Gas J., 62(48), pp. 78–79.
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(1), pp. 13–23.
Fujii,  K., 1970, “The Improvement of Drilling Operations Using Drilling Log,” (in Japanese), J. Japanese Association Petroleum Technol.,35, pp. 427–428.

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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