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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Definition of drillability – glossary

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 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, 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. About us Contact us Help Terms of use.


Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. As a result, the industry uses hardly any.

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Abstract Drillability of a rlcks is often expressed in terms of a large number of parameters; however, the industry hardly uses any. It also indicates a co-efficient of energy transfer and the extent of crillability in an efficient drilling process. Peer reviewed only Published between: Proceedings of an international conference Subsea Controls and Data Acquisition ‘ 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.

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. The real rock is in between depending upon the rock type.

Definition of drillability

Rock Mechanics Symposium and 5th U. Log in to your subscription Username.

The relevant rock properties are density, porosity, compressional and shear wave velocities, unconfined compressive strength, Mohr friction angle, mineralogy, and grain sizes. However, quite often, rock properties like UCS and abrasiveness have historically been used to define rock drillability and help ov bit selection, drive mechanism and drilling parameters.


Publishers Content Coverage Privacy. Proceedings of an international conference Oceanology: American Rock Mechanics Association Downloads 1 in the last 30 days 1, since Show more detail.

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. Quite often these are not well understood or communicated to the end users. Proceedings of an International Conference Submersible Technology: Advanced search Show search help.

Proceedings of an international conference Diverless and Deepwater Techology: 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.