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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It also indicates a co-efficient of energy transfer and the extent of vibration in an efficient drilling process.

The relevant rock properties are density, porosity, compressional and shear wave velocities, unconfined compressive strength, Mohr friction angle, mineralogy, and grain sizes. Rock Mechanics Symposium and 5th U. Proceedings of an international conference Diverless and Deepwater Techology: Peer reviewed only Published between: Publishers Drillabilitg Coverage Privacy. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition.

Drillability of rocks, by an expert, is defined by a large 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.


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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. 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.

Proceedings of an international conference Oceanology: These are compiled and normalized in a scale of 1 to 8; value of 1 represents very soft rock and a value of 8 represents hard rock, ideally. The drillability is assumed to be indicative of unconfined compressive strength Rocis at atmospheric drilling [1,2] or confined compressive strength CCS together with a factor of efficiency [3,4,5].

Definition of drillability – glossary

American Rock Mechanics Association Downloads 1 in the last 30 days 1, since Show more detail. The real rock is in between depending upon the rock type. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ These rock properties are typically estimated using electric log data [17,18,19,20,21] using a known calibration or mea in eocks laboratory in absence of logs.


About us Contact us Help Terms of use. Quite often these are not well understood or communicated to the end users. Proceedings of an International Conference Submersible Technology: Abstract Drillability of a rock is often expressed in terms of a large number of parameters; however, the industry crillability uses any.

Advanced search Show search help. As a result, the industry uses hardly any. Further, this gives an excellent tool to optimize the bit and drilling process for a given rock formation while depicting its physico-mechanical and micro-structural properties as a signature plot.

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