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

Rock Mechanics Symposium and 5th U. Further, it has been found that these estimates do not often provide the full picture of xrillability of rocks, which have complicated mineralogy and microstructures that go through complex digenesis process.

Definition of drillability – glossary

Quite often these are not well understood or communicated to the end users. About us Contact us Help Terms of use. American Rock Mechanics Association Downloads 1 in the last 30 days 1, since Show more detail. Log in to your subscription Username. The drillability is assumed drillabiity 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].


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.

These rock properties are typically estimated using electric log data [17,18,19,20,21] using a known calibration or mea in the laboratory in absence of logs.

The real rock is in between depending upon the rock type. Proceedings of an international conference Oceanology: 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.

Further, this drillabiilty 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. Publishers Content Coverage Privacy. As a result, the industry uses hardly any. Proceedings of an international conference Diverless and Deepwater Techology: The relevant rock properties are density, porosity, compressional and shear wave velocities, unconfined compressive strength, Mohr friction angle, mineralogy, and grain sizes.


Abstract Drillability of a rock is often expressed in terms of a large number of parameters; however, the industry hardly uses any. Proceedings of an International Conference Submersible Technology: 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.

Definition of drillability

Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. These are compiled and normalized in a scale of 1 to 8; value of 1 represents drilllability soft rock and a value of 8 represents hard rock, ideally.

Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Peer reviewed only Published between: