This paper proposes new methods to estimate both the rock strength and tooth wear while drilling with roller-bits. Laboratory drilling tests were conducted to obtain the penetration rate, bit weight and torque using milled-tooth bits with different tooth wear (T0, T4, T7). Drilling media used for the tests were soft to medium-hard rocks whose uniaxial compressive strength ranged from 14 to 118 MPa. Based on the test results, a parameter, which presents the rock strength independent of the tooth wear, was first investigated. The investigation revealed that a parameter related to the axial energy and the rotary energy required to drill rock is effective to estimate the rock strength independent of the tooth wear. Second, methods to estimate the tooth wear were studied based on the same parameter that represents the rock strength. From the results of this study, methods to measure the tooth wear are proposed.
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e-mail: karasawa.h@aist.go.jp
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September 2002
Technical Papers
Methods to Estimate the Rock Strength and Tooth Wear While Drilling With Roller-Bits—Part 1: Milled-Tooth Bits
H. Karasawa,
e-mail: karasawa.h@aist.go.jp
H. Karasawa
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
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T. Ohno,
T. Ohno
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
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M. Kosugi,
M. Kosugi
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
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J. C. Rowley, Mem. ASME
J. C. Rowley, Mem. ASME
Pajarito Enterprises Consulting Services Inc., Los Alamos, NM 87544
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H. Karasawa
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
e-mail: karasawa.h@aist.go.jp
T. Ohno
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
M. Kosugi
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
J. C. Rowley, Mem. ASME
Pajarito Enterprises Consulting Services Inc., Los Alamos, NM 87544
Contributed by the Petroleum Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by the Petroleum Division, October 20, 1997; revised manuscript received April 9, 2002. Editor: A. K. Wojtanowicz.
J. Energy Resour. Technol. Sep 2002, 124(3): 125-132 (8 pages)
Published Online: August 6, 2002
Article history
Received:
October 20, 1997
Revised:
April 9, 2002
Online:
August 6, 2002
Citation
Karasawa, H., Ohno , T., Kosugi, M., and Rowley, J. C. (August 6, 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. September 2002; 124(3): 125–132. https://doi.org/10.1115/1.1482405
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