Rock Drilling Articles

  • The mechanism and law of wellbore instability due to drill string impact in air drilling

    Due to the low density and small damping factor of gas, drill string vibration in air drilling is much more violent than that in mud. Drill string impact on wellbore wall has a vital effect on wellbore stability in many cases. However, there are few researches about drill string impact on wellbore wall so far. In this paper, the calculation model of drill string impact on wellbore wall was ...


    By Inderscience Publishers

  • Acoustic fingerprinting for rock identification during drilling

    During the process of mining, it is imperative to know the type and properties of the rocks being handled. The current technology for this involves core drilling, and subsequently subjecting the drilled cores to various tests in the laboratory, to identify the rocks and establish their properties. In many cases, obtaining a sample may be cumbersome and/or non–profitable. This paper presents a ...


    By Inderscience Publishers

  • Coiled Tube Turbodrilling: a proposed technology to optimise drilling deep hard rocks for mineral exploration

    The need to drill deep boreholes more efficiently for mineral exploration has raised the attention to investigate the feasibility of recent drilling technologies for such applications. The two principal methods of Reverse Circulation (RC) and diamond core drilling are usually used in combination by mine operators are subjected to certain limitations and inefficiencies. Considering that delivering ...


    By Inderscience Publishers

  • Thermal stress on bottom hole rock of gas drilling

    Gas drilling has higher penetration than mud drilling. The greatest reason for this phenomenon with gas is that the gas is greatly cooled by expansion as it passes through the bit and thereby cools the bottom of the hole. The thermal stress at bottom–hole occurs during this process. The concept of thermal crushing of rocks is analysed in this study. The theoretical methods are developed to ...


    By Inderscience Publishers

  • A fuzzy logic based classification for assessing of rock mass drillability

    This paper describes a fuzzy classification system for evaluating of rock mass drillability. Six parameters; Uniaxial Compressive Strength (UCS), joints dipping, Mohs hardness, joints aperture, joints spacing and grain size have been used. In this fuzzy system, each rock mass is classified into five modes from very poor to excellent condition. As a case study, 15 rock masses in two mines in Iran ...


    By Inderscience Publishers

  • Estimating rock properties using sound level during drilling: field investigation

    The process of drilling, in general, always produces sound as a by-product. Sound is used as a diagnostic tool for identification of faulty components in the mechanical industry. However, its application in the mining industry for estimating rock properties has not been much explored. Knowledge of rock properties is essential for mine planning and design. An attempt has been made in this paper to ...


    By Inderscience Publishers

  • A comparison of two instructional approaches in teaching underground rock bolt installation with a Jackleg Drill

    An integrated hypermedia training tool on underground rock bolting was evaluated using qualitative and quantitative methodologies to compare it with the traditional method of training underground rock bolters. Usability experiments performed underscore the need to evaluate a new product to ensure that it meets the requirements of users. Statistical results from comparative experiment indicate ...


    By Inderscience Publishers

  • Exhaust Purifier for Rock Drill

    Description Gardner Denver MK45H rock drill. Challenge A universal exhaust purifier was required that could easily be retrofitted into the vehicle exhaust pipe. Solution DCL supplied an exhaust purifier with connection cones to match the vehicle exhaust tube diameter. The unit was connected to the exhaust tube with standard muffler u-clamps. Quick-release clamps on ...


    By DCL International Inc.

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