Methods to Estimate the Rock Strength and Tooth Wear While Drilling With Roller-Bits—Part 1: Milled-Tooth Bits

DOI PDF 被引用文献3件
  • H. Karasawa
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569 Japan
  • 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
    Pajarito Enterprises Consulting Services Inc., Los Alamos, NM 87544

書誌事項

公開日
2002-08-06
DOI
  • 10.1115/1.1482405
公開者
ASME International

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説明

<jats:p>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.</jats:p>

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