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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Proceedings of an international conference Diverless and Deepwater Techology: Rock Mechanics Symposium and 5th U.

Definition of drillability – glossary

Peer reviewed only Published between: 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].

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. 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. These rock properties are typically estimated using electric log data [17,18,19,20,21] using a known calibration or mea in the drillabillity in absence of logs. Abstract Drillability of a rock is often expressed in terms of a large number of parameters; however, the industry hardly uses any. Publishers Content Coverage Privacy.

Advanced search Show search help. The real rock is in between depending upon the rock type. It also indicates a co-efficient of energy transfer and the extent of vibration in an efficient drilling process.

Drillability of rocks, by an expert, is defined by a large number of parameters rocka, which are not well understood or communicated to the end user. Log in to your subscription Username. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Proceedings of an International Conference Submersible Technology: American Rock Mechanics Association Downloads 1 in the last 30 days 1, since Show more detail.


About us Contact us Help Terms of use. 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 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. As a result, the industry uses hardly any.

Further, it has been found that these estimates do not often provide the full picture of drillability of rocks, pf have complicated mineralogy and microstructures that go through complex digenesis process. 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. Proceedings of an international conference Oceanology: