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A New Approach of Rock Cutting Efficiency Evaluation by using Plastic Energy Dissipation Ratio

  • Tunnel Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Polycrystalline Diamond Compact (PDC) bit is extensively used in oil & gas drilling, the rock cutting efficiency of PDC cutter directly determines the drilling efficiency and costs. Hence, it is crucial to evaluate the rock cutting efficiency of PDC cutters. The Mechanical Specific Energy (MSE) is used as an index for long periods of time to evaluate the rock cutting efficiency, however, the energy dissipation in rock breaking cannot be further calculated in details, leading to inaccuracy. To address this problem, the new concept of Plastic Energy Dissipation Ratio (PEDR) and its model are presented, a new approach for rock cutting efficiency evaluation by using PEDR is also put forward. Compared with MSE, the PEDR can determine the Optimum Depth of Cut (DOC) under various conditions. The theoretical analysis shows that the critical DOC, governing the transition of ductile to brittle failure mode, is the optimal cutting depth, having the smallest PEDR and highest rock cutting efficiency. The test and simulation of rock cutting are carried out to verify the PEDR model, and the PEDR under different DOC, cutting velocities and rake angles are depicted and discussed. The results can provide a theoretical basis for the design of PDC cutter and optimization of drilling parameters.

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Authors and Affiliations

  1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

    Weiji Liu & Xiaohua Zhu

  2. Postdoctoral Research Station for Oil and Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China

    Weiji Liu

Authors
  1. Weiji Liu
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  2. Xiaohua Zhu
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Correspondence to Xiaohua Zhu.

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Liu, W., Zhu, X. A New Approach of Rock Cutting Efficiency Evaluation by using Plastic Energy Dissipation Ratio. KSCE J Civ Eng 23, 879–888 (2019). https://doi.org/10.1007/s12205-018-0100-0

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  • DOI: https://doi.org/10.1007/s12205-018-0100-0

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