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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

Bingham,  M. G., 1964, “How Rock Properties Are Related to Drilling,” Oil & Gas Journal, 62, No. 50, pp. 94.62, No. 50, pp. 96–98.62, No. 50, pp. 101.
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.
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.
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.
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 the 67th Annual Technical Conference and Exhibition of the SPE, Washington, DC, October 4–7, pp. 373–388.
Warren,  T. M., 1981, “Drilling Model for Soft-Formation Bits,” J. Pet. Technol., 33, pp. 963–969.
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.
Karasawa,  H., Ohno,  T., and Kosugi,  M., 1996, “Methods for Estimation of Rock Strength and Tooth Wear Using Tooth Bit,” (in Japanese), J. Mining and Materials Processing Institute of Japan, 112, pp. 623–630.
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.
Bingham,  M. G., 1964, “How to Make the R/N-W/D Chart and What It Means,” Oil & Gas Journal, 62, No. 45, pp. 212–214.62, No. 45, pp. 216–217.
Warren,  T. M., 1984, “Factors Affecting Torque for a Roller Cone Bit,” J. Pet. Technol., 36, pp. 1500–1508.
Teale,  R., 1965, “The Concept of Specific Energy in Rock Drilling,” Int. J. Rock Mech. Min., 2, pp. 57–73.
Edwards,  J. H., 1964, “Engineered Drilling Operations (Part 1),” World Oil, 158, No. 6, pp. 87–92.
Bingham,  M. G., 1964, “How to Interpret Drilling in the Performance Region,” Oil & Gas Journal, 62, No. 46, pp. 173.62, No. 46, pp. 176.62, No. 46, pp. 179.
Maurer,  W. C., 1962, “The “Perfect-Cleaning” Theory of Rotary Drilling,” J. Pet. Technol., 14, pp. 1270–1274.
Bingham,  M. G., 1964, “Needed: Formulas for Predicting Drilling in the Field,” Oil & Gas Journal, 44, No. 44, pp. 52–57.

Figures

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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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Drilling machine used for the tests
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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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(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 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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Relationship between uniaxial compressive strength of rock (Sc) and drillability strength of rock (Ds)
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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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(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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