Rock Drillability. George Exadaktylos. Professor of Rock Mechanics & Mining Engineering, School of Mineral Resources. Engineering, Technical University. The purpose of this paper is to provide a proper, practical and convenient drilling rate index (DRI) prediction model based on rock material. Quantifying the rock microfabric is one of the most important research interests and challenges in the field of rock drilling and excavation.
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Drillability of rocks, by an expert, is defined by a drillanility number of parameters [6,7,8,9,10,11,12,13,14,15,16], which are not well understood or communicated to the end user. However, quite often, rock properties like UCS and abrasiveness have historically been used to define rock drillability and help decide bit selection, drive mechanism and drilling parameters. American Rock Mechanics Drillabiility Downloads 1 in the last 30 days 1, since Show more detail.
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The relevant rock properties are density, porosity, compressional and shear wave velocities, unconfined compressive strength, Mohr friction angle, mineralogy, and grain sizes.
Quite often these are not well understood or communicated to the end users. These rock properties are typically estimated using pf log data [17,18,19,20,21] using a known calibration or mea in the laboratory in absence of logs.
Publishers Content Coverage Privacy. As a result, the industry uses hardly any.
Definition of drillability – glossary
Rock Mechanics Symposium and 5th U. Abstract Drillability of a rock drlilability often expressed in terms of a large number of parameters; however, the industry hardly uses any.
Proceedings of an international conference Diverless and Deepwater Techology: Further, it has been found that these estimates do not often provide the full picture of drillability of rocks, which have complicated mineralogy and microstructures that go through complex digenesis process.
As a compromise, the present work describes drillability in terms of eight simple physical, mechanical, and micro-structural properties, which are displayed visually and are available from either log data or from laboratory core testing.
Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition.
The real rock is in between depending upon the rock type. Advanced search Show search help.
The drillability is assumed to be indicative of unconfined compressive strength UCS at atmospheric drilling [1,2] or confined compressive strength CCS together with a factor of efficiency [3,4,5]. Further, this gives an excellent tool to optimize tocks bit and drilling process for a given rock formation while depicting its physico-mechanical and micro-structural properties as a signature plot.
Proceedings of an international conference Subsea Controls drillabllity Data Acquisition ‘ Proceedings of an International Conference Submersible Technology: It also indicates a co-efficient of energy transfer and the extent of vibration in an efficient drilling process.