A new classification system for evaluating rock penetrability |
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| Authors: | S.H. Hoseinie M. Ataei M. Osanloo |
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| Affiliation: | 1. School of Mining Engineering, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran;2. Faculty of Mining Engineering and Metallurgy, Amirkabir University of Technology, Tehran, Iran;1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;2. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, PO Box: 15875-4413, 424, Hafez Ave., Tehran, Iran;1. Norman B. Keevil Institute of Mining Engineering, University of British Columbia, Vancouver V6T1Z4, Canada;2. School of Mining and Petroleum Engineering, University of Alberta, Edmonton T6G2W2, Canada;1. Department of Exploration and Production, IFP School, Rueil Malmaison, France;2. Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran;1. School of Mining, Petroleum and Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran;2. National Iranian South Oil Company, Ahvaz, Iran |
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| Abstract: | This paper presents a new classification system called the Rock Penetrability index (RPi). An evaluation model based on the fuzzy Delphi analytic hierarchy process (FDAHP) has been used for estimation of penetrability and drillability of rocks. For this purpose, five parameters of the rock material, including uniaxial compressive strength, Schimazek's F-abrasivity, mean Moh's hardness, texture and grain size and Young's modulus have been investigated and rated. In the RPi system, a number from 10.25 to 100 can be assigned to each rock, with higher values corresponding to greater ease of drilling and penetration into rock. Based on the RPi classification, rocks are classified into five modes from the view point of penetrability: very poor, poor, medium, good and very good. |
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