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Title: Mechanical specific energy versus depth of cut in rock cutting and drilling

Abstract

The relationship between Mechanical Specific Energy (MSE) and the Rate of Penetration (ROP), or equivalently the depth of cut per revolution, provides an important measure for strategizing a drilling operation. This study explores how MSE evolves with depth of cut, and presents a concerted effort that encompasses analytical, computational and experimental approaches. A simple model for the relationship between MSE and cutting depth is first derived with consideration of the wear progression of a circular cutter. This is an extension of Detournay and Defourny's phenomenological cutting model. Wear is modeled as a flat contact area at the bottom of a cutter referred to as a wear flat, and that wear flat in the past is often considered to be fixed during cutting. But during a drilling operation by a full bit that consists of multiple circular cutters, the wear flat length may increase because of various wear mechanisms involved. The wear progression of cutters generally results in reduced efficiency with either increased MSE or decreased ROP. Also, an accurate estimate of removed rock volume is found important for the evaluation of MSE. The derived model is compared with experiment results from a single circular cutter, for cutting soft rock undermore » ambient pressure with actual depth measured through a micrometer, and for cutting high strength rock under high pressure with actual cutting area measured by a confocal microscope. Lastly, the model is employed to interpret the evolution of MSE with depth of cut for a full drilling bit under confining pressure. The general form of equation of the developed model is found to describe well the experiment data and can be applied to interpret the drilling data for a full bit.« less

Authors:
 [1];  [2];  [2];  [3]
+ Show Author Affiliations
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  3. Univ. of Pittsburgh, Pittsburgh, PA (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1441258
Report Number(s):
NETL-PUB-21652
Journal ID: ISSN 1365-1609; PII: S1365160916304865
Grant/Contract Number:  
AC26-04NT41817; FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Rock Mechanics and Mining Sciences
Additional Journal Information:
Journal Volume: 100; Journal Issue: C; Journal ID: ISSN 1365-1609
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Mechanical specific energy; Depth of cut; Cutter wear; Rock cutting; Frictional contact

Citation Formats

Zhou, Yaneng, Zhang, Wu, Gamwo, Isaac, and Lin, Jeen -Shang. Mechanical specific energy versus depth of cut in rock cutting and drilling. United States: N. p., 2017. Web. doi:10.1016/j.ijrmms.2017.11.004.
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Zhou, Yaneng, Zhang, Wu, Gamwo, Isaac, & Lin, Jeen -Shang. Mechanical specific energy versus depth of cut in rock cutting and drilling. United States. https://doi.org/10.1016/j.ijrmms.2017.11.004
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Zhou, Yaneng, Zhang, Wu, Gamwo, Isaac, and Lin, Jeen -Shang. Thu . "Mechanical specific energy versus depth of cut in rock cutting and drilling". United States. https://doi.org/10.1016/j.ijrmms.2017.11.004. https://www.osti.gov/servlets/purl/1441258.
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@article{osti_1441258,
title = {Mechanical specific energy versus depth of cut in rock cutting and drilling},
author = {Zhou, Yaneng and Zhang, Wu and Gamwo, Isaac and Lin, Jeen -Shang},
abstractNote = {The relationship between Mechanical Specific Energy (MSE) and the Rate of Penetration (ROP), or equivalently the depth of cut per revolution, provides an important measure for strategizing a drilling operation. This study explores how MSE evolves with depth of cut, and presents a concerted effort that encompasses analytical, computational and experimental approaches. A simple model for the relationship between MSE and cutting depth is first derived with consideration of the wear progression of a circular cutter. This is an extension of Detournay and Defourny's phenomenological cutting model. Wear is modeled as a flat contact area at the bottom of a cutter referred to as a wear flat, and that wear flat in the past is often considered to be fixed during cutting. But during a drilling operation by a full bit that consists of multiple circular cutters, the wear flat length may increase because of various wear mechanisms involved. The wear progression of cutters generally results in reduced efficiency with either increased MSE or decreased ROP. Also, an accurate estimate of removed rock volume is found important for the evaluation of MSE. The derived model is compared with experiment results from a single circular cutter, for cutting soft rock under ambient pressure with actual depth measured through a micrometer, and for cutting high strength rock under high pressure with actual cutting area measured by a confocal microscope. Lastly, the model is employed to interpret the evolution of MSE with depth of cut for a full drilling bit under confining pressure. The general form of equation of the developed model is found to describe well the experiment data and can be applied to interpret the drilling data for a full bit.},
doi = {10.1016/j.ijrmms.2017.11.004},
journal = {International Journal of Rock Mechanics and Mining Sciences},
number = C,
volume = 100,
place = {United States},
year = {Thu Dec 07 00:00:00 EST 2017},
month = {Thu Dec 07 00:00:00 EST 2017}
}
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https://doi.org/10.1016/j.ijrmms.2017.11.004
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    Works referencing / citing this record:

    Study on Thermal Energy Conversion Theory in Drilling Process of Coal and Rock Mass with Different Stresses
    journal, November 2019

    • Qiu, Pengqi; Li, Xuehui; Ning, Jianguo
    • Energies, Vol. 12, Issue 22
    • DOI: 10.3390/en12224282

    Experimental investigation on the effect of wear flat inclination on the cutting response of a blunt tool in rock cutting
    journal, May 2018

    Stress Distribution and Fluctuation Cycle on the Rack Face of the Rock Cutting Tool
    journal, December 2019

    • Yang, Xiaofeng; Xue, Yongchao; Zhou, Jiaheng
    • Shock and Vibration, Vol. 2019
    • DOI: 10.1155/2019/6830519

    Effect of Cutting Tool Properties and Depth of Cut in Rock Cutting: An Experimental Study
    journal, March 2018

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